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IMV K2 Instruction Manual

Non-gaussian random vibration control system
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Non-Gaussian Random Vibration Control System
K2/ NON-GAUSSIAN
K2Sprint/ NON-GAUSSIAN
Instruction Manual
Limitation of K2Sprint/NON-GAUSSIAN
U
･Maximum numbers of usable input channel are '2' channels.
･Option of LIMIT CONTROL can not be added.
IMV CORPORATION

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  • Page 1 Non-Gaussian Random Vibration Control System K2/ NON-GAUSSIAN K2Sprint/ NON-GAUSSIAN Instruction Manual Limitation of K2Sprint/NON-GAUSSIAN ･Maximum numbers of usable input channel are ‘2’ channels. ･Option of LIMIT CONTROL can not be added. IMV CORPORATION...
  • Page 2 Type of Document : Instruction Manual System Applied : K2/K2Sprint Software < NON-GAUSSIAN > Later than Version 14.6.0...
  • Page 3 Japanese Edition Version Date Contents 10.0.0 2016.02.29 First edition 10.0.1 2016.03.02 Correction of a misprint 13.0.0 2016.04.28 Correction of a misprint 14.3.0 2019.04.19 Modified description of Data save condition, correction of misprints 14.6.0 2020.04.15 Correction of a misprint English Edition Version Date Contents...

  • Page 4: Table Of Contents

    1.1.5 Non-Gaussian random control ..........1-5 1.1.6 Non-Gaussian characteristic type ..........1-6 1.2 Specifications ..............1-7 1.2.1 NON-GAUSSIAN ..............1-7 Chapter 2 Operation System of K2 Application ..........2-1 2.1 Outline ................2-1 2.2 Test File ................. 2-2 Chapter 3 Basic Operation..............3-1 3.1 Break point PSD ..............
  • Page 5 4.3.2 （This section is left blank intentionally.） ....... 4-12 4.3.3 Control strategy ............4-12 4.3.4 Drive saving ..............4-13 4.3.5 Control speed ............... 4-15 4.3.6 Control sharpness ............4-16 4.3.7 Cross-talk control loop open ..........4-17 4.3.8 Cross-talk information averaging times ........4-18 4.3.9（This section is left blank intentionally.）...
  • Page 6 4.5.2.3.1 Outline............4-39 4.5.2.3.2 Waveform Data File loading ........4-40 4.5.2.3.3 Data edit ............4-43 4.5.2.3.3.1 Filtering..........4-43 4.5.2.3.3.2 Edging ........... 4-45 4.5.2.3.3.3 Scalar calculation........4-48 4.5.2.3.3.4 Data length change........4-50 4.5.2.3.4 CSV data file ........... 4-53 4.5.3 Tolerance Definition ............4-54 4.5.3.1 Tolerance .............
  • Page 7 6.2 Manual Operation ..............6-2...

  • Page 8: Chapter 1 Outline Of The System

    Chapter 1 Outline of the System 1.1 Outline K2/NON-GAUSSIAN is an option of K2/RANDOM. Vibration test is conducted to verify that the designed performance and functions of a product can be maintained until it is discarded by artificially giving it dynamic stress which is assumed to be given during the life cycle of a product.

  • Page 9: Amplitude Probability Density

    1.1.2 Amplitude probability density Amplitude probability density (function) indicates the distribution states of random vibration amplitude (magnitude) to evaluate the characteristics of random vibration. In the graph below, normal waveform graph is turned clockwise by 90, and amplitude values are on the horizontal axis, while time values are on the vertical axis.

  • Page 10: Kurtosis

    1.1.3 Kurtosis Kurtosis (peakedness) indicates the density extent of amplitude probability density in the vicinity of zero (average value), and it also indicates the peakedness in the area close to zero. As kurtosis is larger, the peakedness in the area close to zero is enhanced, and the tail is thicker. As the tail is thicker, the peak of random vibration is higher.

  • Page 11: Skewness

    1.1.4 Skewness Skewness (degree of skew) is an index indicating the asymmetry of amplitude probability density distribution. When skewness is 0, distribution is symmetrical to zero (average value). When skewness is a positive value, the amplitude of which probability is maximum is shifted to the negative side, and the tail of distribution in the positive side is thicker.

  • Page 12: Non-Gaussian Random Control

    1.1.5 Non-Gaussian random control Non-Gaussian random controller, like a conventional random controller, controls ‘Power spectral density (PSD) and rms value’ of the control channel to be coincided with the reference values. In addition, it also controls the non-Gaussian parameters ‘Kurtosis and skewness ’...

  • Page 13: Non-Gaussian Characteristic Type

    1.1.6 Non-Gaussian characteristic type Varied types of non-Gaussian random vibration generating methods are available, and the shape of non-Gaussian random vibration cannot be defined uniquely even when kurtoses are identical. This system enables the reproduction of two types of non-Gaussian random vibration having characteristics different from each other.

  • Page 14: Specifications

    4) Alarm / Abort： For each input channel, the maximum allowance spectrum data (PSD) or RMS value can be specified for setting of Alarm / Abort. 5) Limit control function：Conforms to K2/RANDOM (8) Output channel 1) Number of channels： 1 2) Clipping：...
  • Page 15 (10) Data save： Automatic / Manual Display data save as CSV format (11) Control operation information save and use 1) Storing of the test operation time information and continuing of test operation (Partial execution of the test) 2) Storing the control information and continuing of the control Upper Control response PSD Lower Drive PSD Example of NON-GAUSSIAN execution screen...

  • Page 16: Chapter 2 Operation System Of K2 Application

    The commands used frequently are displayed as icons in each Tool bar. A command is executed or a dialog box corresponding to the command is opened when the icon is clicked. Operation status of K2 Controller is displayed in Status bar. The state during the excitation operation is displayed in Operation status panel.

  • Page 17: Test File

    2.2 Test File In K2 application, necessary information to operate a test is saved in a specified file called ‘Test File’. Following kinds of Test File are available in this system. Necessary Test Files for test operation ・Test Definition File ： K2NON-GAUSSIAN（*.ngaus2）...

  • Page 18: Chapter 3 Basic Operation

    Chapter 3 Basic Operation 3.1 Break point PSD < Example > An example of Break point PSD random test is described as below ; [Reference pattern] Level [(m/s / Hz] Slope：6[dB/oct] 1000 Frequency [Hz] The PSD is specified to 10 [(m/s )rms] having the shape as in the above between 10 [Hz] and 1000 [Hz].
  • Page 19 < Procedures > < Step 1 > Press the button of [New] to start ‘New definition’. ＜Step 2＞ Select an Excitation system from the list of ‘Excitation system information’. 3 - 2...
  • Page 20 ＜Step 3＞ Click the checkbox of ‘Input channel information selection’ and select an input channel information from the list. ① ② ＜Step 4＞ Press the [OK] button. 3 - 3...
  • Page 21 ＜Step 5＞ Press the [Next] button. ＜Step 6＞ Set the Frequency range to ‘1000Hz’. 3 - 4...
  • Page 22 ＜Step 7＞ Set the Control frequency lines to ‘400’. ＜Step 8＞ Specify the Test time as ‘Specify time’. And input the value as ‘Test time : 0 : 10 : 00 (600 sec)’. 3 - 5...
  • Page 23 ＜Step 9＞ Press the [OK] button. ＜Step 10＞ Press the [Next] button. 3 - 6...
  • Page 24 ＜Step 11＞ Press the [OK] button. ＜Step 12＞ Press the [Next] button. 3 - 7...
  • Page 25 ＜Step 13＞ Set the XFR function measurement voltage to 50 (mV ＜Step 14＞ Press the OK button. 3 - 8...
  • Page 26 ＜Step 15＞ Press the [Next] button. ＜Step 16＞ Select ‘Sporadic peak’ in the Non-Gaussian characteristic area. 3 - 9...
  • Page 27 ＜Step 17＞ Select the item of Break point PSD and press the [PSD definition ] button. ① ② ＜Step 18＞ Select the item of level. Input the values for level : 1[(m/s /Hz] and for frequency : 10 [Hz]. Then press the button to add. ②...
  • Page 28 ＜Step 19＞ Select the item of the slope and specify the unit of slope as dB/octave. Input the values for slope : 6 [dB/octave] and for frequency : 100 [Hz]. Then press the button to add. ② ① ＜Step 20＞ As in the same way, select the item of the slope and specify the unit of slope as dB/octave.
  • Page 29 ＜Step 21＞ Press the button of [rms change]. ＜Step 22＞ Select the item of New rms value and input the value as ‘New rms value : 10 [(m/s ) rms]. And press the [OK] button. ① ② 3 - 12...
  • Page 30 ＜Step 23＞ Enter ‘Kurtosis: 5’, and press the [OK] button. ＜Step 24＞ Press the [Tolerance definition] button. 3 - 13...
  • Page 31 ＜Step 25＞ Press the [OK] button. ＜Step 26＞ Press the [OK] button. 3 - 14...
  • Page 32 ＜Step 27＞ Press the [Next] button. ＜Step 28＞ Select ‘Ch.1’ and set as ‘Non-gaussian control’. ② ① 3 - 15...
  • Page 33 ＜Step 29＞ Also, select ‘Ch.2’ and set as ‘Monitor’. ① ② ＜Step 30＞ Press the [OK] button. 3 - 16...
  • Page 34 ＜Step 31＞ Press the [Next] button. ＜Step 32＞ Select ‘Not save’ and press the button of [OK]. ① ② 3 - 17...
  • Page 35 < Step33 > Press the button of [Next]. < Step34 > Press the [OK] button. 3 - 18...
  • Page 36 < Step 35 > The definition is completed. 3 - 19...
  • Page 37 < Save of test> < Step 1 > Save the defined test information to a test file. Click the [Save] button. ＜Step 2＞ The dialog box as below appears. Specify an arbitrary directory in ‘Save in’ and input a name to ‘File name’.
  • Page 38 < Operation of test > < Step 1 > Press the button of [Operation start] for ‘Operation start’. ＜Step 2＞ Press the button of [XFR measurement start]. Initial loop check is automatically operated and the XFR measurement is started. 3 - 21...
  • Page 39 ＜Step 3＞ The system proceeds to the state of waiting for operation start when the XFR measurement is finished. Press the button of [Operation start]. Initial loop check and initial equalization are automatically operated. When initial check and initial equalization are finished, the test operation is started at the initial excitation level (-10dB in this example).
  • Page 40 ＜Step 5＞ Test time starts to count the elapsed time for test operation when the excitation level is set to 0dB. ＜Step 6＞ Test operation is stopped when the test time ends. Press the button of [Operation end]. The system proceeds to the display of test definition mode. 3 - 23...

  • Page 41: Measured Psd

    3.2 Measured PSD <Example> An example of the measured PSD test is described as below. [Reference pattern] Measured PSD data Sporadic peak type is selected, and kurtosis is set to 5.0 during control. [Control condition] Frequency range : 2000Hz Control lines : 400 lines [Test time] 10 minutes...
  • Page 42 < Procedures > < Step 1 > Press the button of [New] to start ‘New definition’. ＜Step 2＞ Select an Excitation system from the list of ‘Excitation system information’. 3 - 25...
  • Page 43 ＜Step 3＞ Click the checkbox of ‘Input channel information selection’ and select an input channel information from the list. ① ② ＜Step 4＞ Press the [OK] button. 3 - 26...
  • Page 44 ＜Step 5＞ Press the [Next] button. ＜Step 6＞ Set the Frequency range to ‘2000Hz’. 3 - 27...
  • Page 45 ＜Step 7＞ Set the Control frequency lines to ‘400’. ＜Step 8＞ Specify the Test time as ‘Specify time’. And input the value as ‘Test time : 0 : 10 : 00 (600 sec)’. 3 - 28...
  • Page 46 ＜Step 9＞ Press the [OK] button. ＜Step 10＞ Press the [Next] button. 3 - 29...
  • Page 47 ＜Step 11＞ Press the [OK] button. ＜Step 12＞ Press the [Next] button. 3 - 30...
  • Page 48 ＜Step 13＞ Set the XFR function measurement voltage to 50 (mV ＜Step 14＞ Press the OK button. 3 - 31...
  • Page 49 ＜Step 15＞ Press the [Next] button. ＜Step 16＞ Select ‘Sporadic peak’ in the Non-Gaussian characteristic area. 3 - 32...
  • Page 50 ＜Step 17＞ Select the item of Measured PSD and press press the [PSD definition ]. ① ② ＜Step 18＞ Press the button of [CSV file loading]. 3 - 33...
  • Page 51 ＜Step 19＞ Select a file name to be loaded and press the button to open the file. ① ② ＜Step 20＞ Press the OK button. 3 - 34...
  • Page 52 ＜Step 21＞ Press the button of [rms change]. ＜Step 22＞ Select the item of New rms value and input the value as ‘New rms value : 10 [(m/s ) rms]. And press the [OK] button. ② ① 3 - 35...
  • Page 53 ＜Step 23＞ Enter ‘Kurtosis: 5’, and press the [OK] button. ① ② ＜Step 24＞ Press the [Tolerance definition] button. 3 - 36...
  • Page 54 ＜Step 25＞ Press the [OK] button. ＜Step 26＞ Press the [OK] button. 3 - 37...
  • Page 55 ＜Step 27＞ Press the [Next] button. ＜Step 28＞ Select ‘Ch.1’ and set as ‘Non-gaussian control’. ① ② 3 - 38...
  • Page 56 ＜Step 29＞ Also, select ‘Ch.2’ and set as ‘Monitor’. ① ② ＜Step 30＞ Press the [OK] button. 3 - 39...
  • Page 57 ＜Step 31＞ Press the [Next] button. ＜Step 32＞ Select ‘Not save’ and press the button of [OK]. ① ② 3 - 40...
  • Page 58 < Step33 > Press the button of [Next]. < Step34 > Press the [OK] button. 3 - 41...
  • Page 59 < Step35 > The definition is completed. 3 - 42...
  • Page 60 < Save of test> < Step 1 > Save the defined test information to a test file. Click the [Save] button. ＜Step 2＞ The dialog box as below appears. Specify an arbitrary directory in ‘Save in’ and input a name to ‘File name’.
  • Page 61 < Operation of test > < Step 1 > Press the button of [Operation start] for ‘Operation start’. ＜Step 2＞ Press the button of [XFR measurement start]. Initial loop check is automatically operated and the XFR measurement is started. 3 - 44...
  • Page 62 ＜Step 3＞ The system proceeds to the state of waiting for operation start when the XFR measurement is finished. Press the button of [Operation start]. Initial loop check and initial equalization are automatically operated. When initial check and initial equalization are finished, the test operation is started at the initial excitation level (-10dB in this example).
  • Page 63 ＜Step 5＞ Test time starts to count the elapsed time for test operation when the excitation level is set to 0dB. ＜Step 6＞ Test operation is stopped when the test time ends. Press the button of [Operation end]. The system proceeds to the display of test definition mode. 3 - 46...

  • Page 64: Measured Waveform

    3.3 Measured waveform < Example > An example of the measured waveform test is described as below ; [Reference pattern] PSD calculated from measured waveform data (up to 400 Hz) Kurtosis and skewness calculated from waveform are used for control. [Control condition] Frequency range : 800 Hz...
  • Page 65 < Procedures > < Step 1 > Press the button of [New] to start ‘New definition’. ＜Step 2＞ Select an Excitation system from the list of ‘Excitation system information’. 3 - 48...
  • Page 66 ＜Step 3＞ Click the checkbox of ‘Input channel information selection’ and select an input channel information from the list. ① ② ＜Step 4＞ Press the [OK] button. 3 - 49...
  • Page 67 ＜Step 5＞ Press the [Next] button. ＜Step 6＞ Set the Frequency range to ‘800Hz’. 3 - 50...
  • Page 68 ＜Step 7＞ Set the Control frequency lines to ‘800’. ＜Step 8＞ Specify the Test time as ‘Specify time’. And input the value as ‘Test time : 0 : 10 : 00 (600 sec)’. 3 - 51...
  • Page 69 ＜Step 9＞ Press the [OK] button. ＜Step 10＞ Press the [Next] button. 3 - 52...
  • Page 70 ＜Step 11＞ Press the [OK] button. ＜Step 12＞ Press the [Next] button. 3 - 53...
  • Page 71 ＜Step 13＞ Set the XFR function measurement voltage to 50 (mV ＜Step 14＞ Press the OK button. 3 - 54...
  • Page 72 ＜Step 15＞ Press the [Next] button. ＜Step 16＞ Select ‘Stationary peak’ in Non-Gaussian characteristic area. 3 - 55...
  • Page 73 ＜Step 17＞ Select the item of Measured waveform and press the [PSD definition ] button.. ① ② ＜Step 18＞ Press the button of [File loading]. 3 - 56...
  • Page 74 ＜Step 19＞ Select a file name to be loaded and press the button to open the file. ① ② ＜Step 20＞ Select your desired level data, enter sampling frequency, and press the [OK] button. ① ② ③ 3 - 57...
  • Page 75 ＜Step 21＞ Press the [Next] button. ＜Step 22＞ Sampling frequency of waveform is automatically converted into sampling frequency corresponding with frequency range selected in Step 7. Press the OK button. 3 - 58...
  • Page 76 ＜Step 23＞ Press ‘LPF setting’ button. ＜Step 24＞ Enter ‘Cut-off frequency: 400.0 Hz’, and press the [OK] button. 3 - 59...
  • Page 77 ＜Step 25＞ Press the button of [rms change]. ＜Step 26＞ Select the item of New rms value and input the value as ‘New rms value : 10 [(m/s ) rms]. And press the [OK] button. ② ① 3 - 60...
  • Page 78 ＜Step 27＞ Kurtosis and skewness automatically calculated from waveform are set up. ＜Step 28＞ Check ‘Skewness control is operated’, and press the [OK] button. ① ② 3 - 61...
  • Page 79 ＜Step 29＞ Press the [Tolerance definition] button. ＜Step 30＞ Press the [OK] button. 3 - 62...
  • Page 80 ＜Step 31＞ Press the [OK] button. ＜Step 32＞ Press the [Next] button. 3 - 63...
  • Page 81 ＜Step 33＞ Select ‘Ch.1’ and set as ‘Non-gaussian control’. ① ② ＜Step 34＞ Also, select ‘Ch.2’ and set as ‘Monitor’. ① ② 3 - 64...
  • Page 82 ＜Step 35＞ Press the [OK] button. ＜Step 36＞ Press the [Next] button. 3 - 65...
  • Page 83 ＜Step 37＞ Select ‘Not save’ and press the button of [OK]. ① ② < Step38 > Press the button of [Next]. 3 - 66...
  • Page 84 < Step39 > Press the [OK] button. < Step 40 > The definition is completed. 3 - 67...
  • Page 85 < Save of test> < Step 1 > Save the defined test information to a test file. Click the [Save] button. ＜Step 2＞ The dialog box as below appears. Specify an arbitrary directory in ‘Save in’ and input a name to ‘File name’.
  • Page 86 < Operation of test > < Step 1 > Press the button of [Operation start] for ‘Operation start’. ＜Step 2＞ Press the button of [XFR measurement start]. Initial loop check is automatically operated and the XFR measurement is started. 3 - 69...
  • Page 87 ＜Step 3＞ The system proceeds to the state of waiting for operation start when the XFR measurement is finished. Press the button of [Operation start]. Initial loop check and initial equalization are automatically operated. When initial check and initial equalization are finished, the test operation is started at the initial excitation level (-10dB in this example).
  • Page 88 ＜Step 5＞ Test time starts to count the elapsed time for test operation when the excitation level is set to 0dB. ＜Step 6＞ Test operation is stopped when the test time ends. Press the button of [Operation end]. The system proceeds to the display of test definition mode. 3 - 71...

  • Page 89: Chapter 4 Test Definition

    Chapter 4 Test Definition 4.1 Outline In this system, a complete set of information needed for test operation is called ‘Test’. To perform a test, Test must be defined first of all. This chapter describes the procedure to define the Test. Information of Test completely defined is to be saved in a file as a specified format of ‘Test File’.

  • Page 90: Fundamental/Control Condition

    4.2 Fundamental/Control Condition Control condition of K2 controller is defined. 4.2.1 Frequency range fmax (1) Meaning This item is for specifying the Frequency range for the spectrum analysis. An appropriate value should be set in order to cover the frequency elements included in the reference PSD to be reproduced.

  • Page 91: Control Frequency Lines

    4.2.2 Control frequency lines (1) Meaning This item is for specifying the resolution of spectrum analysis. The resolution of spectrum analysis is specified by the number of lines L In this system, the relation between the number of the lines L and the number of points for spectrum analysis N is described as below ;...

  • Page 92: Controlled Variable

    4.2.4 Controlled variable (1) Meaning Unit of quantity (controlled variable) used as a control objective for K2 controller is specified. Control unit defined in this item is treated as a unit in test definition. A unit specified in ‘Other units’ is added as a Control unit only when the rating information of ‘Other units’...

  • Page 93: Equalization Mode

    4.2.6 Equalization Mode (1) Meaning This item is for setting of the control speed t the initial equalization during the time from the control operation start (a white-noise-like output start), and through the coincidence of the response spectrum with the reference spectrum (within the Tolerance), to the beginning point of the elapsed time counting start.

  • Page 94: Loop Check

    4.2.7 Loop check (1) Meaning This item is for specifying of the strictness of the criteria for monitoring abnormal event in the control loop during control operation using loop check function. Loop check is to be operated in the following condition ; (1) at loop check (before measurement of transfer function) (2) at initial equalization ,at initial equalization for Non-Gaussian (3) in control operation...

  • Page 95: Test Time

    4.2.8 Test time (1) Meaning This item is for specifying of the duration of the test operation. That is, the system automatically stops signal output when the specified time elapses after the start of the test. < Infinite > When the test time is not needed to be set, the value of ‘infinite’ should be selected. In this case, the excitation continues unit [Stop] button is pressed except the case of activation of abort using a predetermined protection function.

  • Page 96: Level Increment

    4.2.10 Level increment (1) Meaning This item is for specifying increment value of changing excitation level. By using dialog box of ‘Level Change’, this setting value can be changed during operation too. 4.2.11 Auto-start (1) Meaning When the value less than 0dB is set for the Initial Output Level, the function of level change that automatically executed from the specified Initial Output Level to 0 dB is called ‘Auto- start’.

  • Page 97: Level Scheduling

    4.2.13 Level Scheduling (1) Meaning This item is for operating a test at the scheduled excitation level. In the setting of Level schedule, Excitation level / Excitation time / Tolerance are defined. The setting of Excitation level and Test time in Level Scheduling gets preference over in others.

  • Page 98: Level

    4.2.13.1 Level (1) Meaning This item is for setting of the excitation level. Excitation level is specified as a relative level to Reference PSD defined in ‘PSD Definition’. 4.2.13.2 Time (1) Meaning This item is for setting of the excitation time. Time is specified by the same method of setting time in ‘Test time’.

  • Page 99: Waveform Control Condition

    4.3 Waveform control condition The items for the condition of waveform control are defined. 4.3.1 Specify the time of XFR measurement excitation (1) Meaning This item is for setting the times of excitation / measurement operation in XFR measurement. (The measurement data is to be averaged.) <Methods of XFR measurement excitation>...

  • Page 100: This Section Is Left Blank Intentionally

    4.3.2 （This section is left blank intentionally.） 4.3.3 Control strategy This item is ordinarily to be used in the ‘normal’ mode. This item is used to partly change the control algorithm when the waveform cannot be controlled by ordinary procedures. The control strategy can be selected from the following three types : Normal : In this type, the impulse response of the inverse system (in general, non-causal) created on the basis of the transfer function for equalization is handled evenly before and after the time origin (past and future).

  • Page 101: Drive Saving

    4.3.4 Drive saving (1) Meaning This item is usually to be set to ‘normal’. When the linear independence of transfer function matrix H becomes unstable, the equalization matrix G calculated from H also becomes unstable, so some regularization is needed. This item specifies a parameter for regularization.
  • Page 102 The selection range is described as follows : Stricter solution : The regularization stated above is not almost done, but a strict mathematical solution is searched. When the solution is unstable or almost unstable, too large a drive voltage may be given. In this event, actual excitation may be impossible, so Stricter Solution is insubstantial.

  • Page 103: Control Speed

    4.3.5 Control speed (1) Meaning Control speed is usually a concept of follow-up speed with response change of the controlled system (if there is one) during control. This item is for the transfer information (waveform control information) corresponding to the waveform control.

  • Page 104: Control Sharpness

    4.3.6 Control sharpness (1) Meaning Random controller shapes drive spectrum so that control response spectrum is coincided with control reference spectrum. Basic data of the shaping includes transfer information and control errors(control response / control reference). The random controller directly corrects drive spectrum so that it is coincided with control reference spectrum based on errors which could not be controlled by transfer information.

  • Page 105: Cross-Talk Control Loop Open

    4.3.7 Cross-talk control loop open (1) Meaning There are two kinds of control information in the test. The one is the control information for PSD control and the other is transfer information for the waveform control operation. Renewing operation of the control loop is defined in ‘cross-talk control loop open’ of the waveform control condition and in ‘open loop operation’...

  • Page 106: Cross-Talk Information Averaging Times

    4.3.8 Cross-talk information averaging times (1) Meaning This system adopts the method of renewing of transfer function data (the transfer information for waveform control) for tracking the changing response of controlled system. The renewing of transfer function data is executed as below ; The cross spectrum between the drive data and the response data is calculated as the averaged value obtained by the spectrum analysis for the specified frames.

  • Page 107: Excitation System Setting

    4.4 Excitation System Setting This item is for setting of the excitation / output system for control. 4.4.1 Initial output voltage (1) Meaning ‘Initial output voltage’ means the voltage to be outputted to the shaker at the first loop check. The control is always started at this drive voltage when the excitation starts from the state of no drive.

  • Page 108: Clipping

    4.4.3 Clipping (1) Meaning Setting conditions for ‘Clipping’ to be performed by output channel is allowed. Clipping is roughly divided in two types shown below. ・Drive waveform clipping ・Control response waveform clipping 4.4.3.1 Clipping of drive waveform (1) Meaning Drive waveform clipping can be specified by either of two types of methods shown below.

  • Page 109: Allowance Clipping Ratio

    4.4.3.1.3 Allowance clipping ratio (1) Meaning In this system, the setting with only ‘Allowable voltage’ is provided as a standard. In case of the Clipping by output voltage, when the level close to Output voltage limit value is outputted, almost all the signals are clipped. The execution of the clipping process means a modification of the drive signal spectrum, therefore the clipping process causes the lowering of the spectrum control ability.

  • Page 110: High Pass Filter(Hpf)

    4.4.4 High Pass Filter(HPF) (1) Meaning This item is for setting of inserting or not-inserting of a high pass filter to the drive signal output circuit which is the concrete mechanism to realize ‘the function of Extra-displacement reduction’. The following can be chosen for setting of usage of the high pass filter, and for setting of cut- off frequency fc.

  • Page 111: Control Reference

    4.5 Control Reference This item is for defining the control reference. Test pattern is determined by the setting of this definition. 4.5.1 PSD definition 4.5.1.1 Non-Gaussian characteristic (1) Meaning Select any non-Gaussian characteristic. It is not that which of them is superior to another. Select any choice appropriate for the test.
  • Page 112 reference PSD band. Thus, it is recommended to set the control frequency range greater than the maximum frequency of the reference PSD. ・Non-Gaussian equalization time Time required for kurtosis and skewness to be coincided with their references may be longer than that of the sporadic peak type. It depends on the shape of PSD.

  • Page 113: Psd Definition Type

    4.5.2 PSD definition type (1) Meaning This item is for specifying the types of PSD. In this system, the definition method of PSD data are provided as below ; 1) Break point PSD definition 2) Measured PSD definition 3) Measured waveform definition Select a definition method of PSD data in PSD definition type.

  • Page 114: Break Point Psd Definition

    4.5.2.1 Break point PSD definition 4.5.2.1.1 Outline PSD is defined by a pair of the frequency and the level (or the slope). <Example> 10 [Hz] ~ 100 [Hz] : a spectrum having the slope [6 dB/oct] with 10 [Hz], 0.001 [(m/s /Hz] as starting point 100 [Hz] ~ 1000 [Hz] : a spectrum having the constant level (the slope [0 dB/oct] ) Note) The vertical axis of the graph in the profile is scaled by the control unit.

  • Page 115: Frequency

    Break Point (B.P.) data is registered by using these buttons. Also the B.P. data can be registered for 256 at the maximum. [Add] : A new B.P. data is registered. When this button is pressed after inputting of the frequency or the level of B.P.

  • Page 116: Rms Change

    4.5.2.1.5 rms change (1) Meaning When the definition of the spectrum stated in the above is completed, the conversion of its RMS value is done. This function is for proportional converting of reference PSD, that is for converting the defined spectrum into the data having the required RMS value by changing only its level without changing its shape.

  • Page 117: Non-Gaussian Control

    4.5.2.1.6 Non-Gaussian control (1) Meaning Setting control reference of kurtosis and skewness is allowed. <Kurtosis> This item is for setting of the control reference of kurtosis. The input range is: 3.0 < K  10.0 <Skewness control is operated> This item is for selecting whether the function of ‘skewness control’ is executed. This parameter is valid only when ‘Stationary peak’...

  • Page 118: Measured Psd Definition

    4.5.2.2 Measured PSD definition 4.5.2.2.1 Outline Reference PSD is defined by using of a measured PSD data. The measured PSD data to be used should be a CSV file written in the specified format. Refer to “4.5.2.2.5 CSV data file” about the details of this format. The frequency resolution Δf of the used PSD data file is not necessary to coincide with the Δf defined in test definition.

  • Page 119: Data Edit

    [CSV file loading] : The PSD data file is loaded. <Data edit> The loaded data file can be selected by the following buttons; [LPF setting] : This item is for operating of low pass filtering or truncating of the data. [HPF setting] : This item is for operating of high pass filtering or truncating of the data.
  • Page 120 4.5.2.2.2 PSD Data File loading (1) Meaning This item is for selecting the measured PSD data file to be used as a PSD data. In the dialog of the measured PSD definition, press the [CSV file loading] button to open the dialog box of File loading.
  • Page 121 After the objective data file selection is completed, the data to be used in the definition is to be selected among the data described in the data file. < File selection > Dialogue box to select CSV file is displayed, and PSD data file can be selected again. <PSD unit>...

  • Page 122: Lpf (Low Pass Filter)

    4.5.2.2.3 Data edit (1) Meaning When the PSD data is determined, the selected measured PSD data is displayed and the buttons in ‘Data edit’ become valid. The data can be edited by a selected button to be executed on demand. 4.5.2.2.3.1 LPF (low pass filter) (1) Meaning This item is for operating of low pass filtering of PSD data or truncating the data in...

  • Page 123: Hpf (High Pass Filter)

    4.5.2.2.3.2 HPF (high pass filter) (1) Meaning This item is for operating of high pass filtering to PSD data at truncating the data in unnecessary frequency band to discard. A dialog box of HPF setting appears by pressing of the [HPF Setting] button. The contents and the meaning of these setting items are the same as that of LPF.

  • Page 124: Level Change

    4.5.2.2.3.3 Level Change (1) Meaning This item is for changing the PSD data level in the specified frequency range. When the button [Level Change] is pressed, the dialog of level change appears. The items for setting are; ・Frequency range This item is for setting of the frequency range for level change. The minimum value of the frequency range to be set is the frequency resolution Δf of PSD data file.

  • Page 125: Rms Change

    4.5.2.2.3.4 rms change (1) Meaning This item is for converting the defined PSD into the data having the required RMS value by changing only its level without changing its shape. When the button [rms change] is pressed, the dialog box of RMS change appears. Specifying method of RMS value can be selected among the following two methods ;...

  • Page 126: Csv Data File

    4.5.2.2.5 CSV data file (1) File Format Text File (MS-DOS) (2) Description formats of Data The frequency domain data are described as follows. 1st. column 2nd. column 3rd. column 1st. line Frequency[Hz], Data name 1, Data name 2, …… 2nd. line 0.0, ***.***, ***.**,...

  • Page 127: Measured Waveform Definition

    4.5.2.3 Measured Waveform definition 4.5.2.3.1 Outline Reference PSD is defined by using of a measured waveform data. First, select waveform data, and edit the waveform as necessary. Calculate PSD data and non-Gaussian parameters (kurtosis, skewness) from the waveform data. Edit the data furthermore as necessary, and use them as reference PSD data.
  • Page 128 4.5.2.3.2 Waveform Data File loading (1) Meaning The ‘Measured waveformdata file’, the base of PSD data, is selected and edited. First, a dialogue box to select CSV file is displayed. After the reference data file is selected, data to be used for definition is selected from the data in the data file.
  • Page 129 <Sampling frequency> Sampling frequency of data file is specified. When sampling frequency is automatically calculated from time data, the calculated sampling frequency is displayed (In this case, changing sampling frequency is not allowed.) <Calculation of sampling frequency from time data> Sampling frequency is automatically calculated by the data assigned as time data.

  • Page 130: Filtering

    <Selection of waveform data file> Waveform data file is selected by using the buttons shown below. [ File loading ]: This button is for loading waveform data files. <Display data selection> The graph data can be selected from the items below. ・Waveform display Waveform graph is displayed.
  • Page 131 4.5.2.3.3 Data edit (1) Meaning When the PSD data is determined, the selected measured waveform data is displayed and the buttons in ‘Data edit’ become valid. The data can be edited by a selected button to be executed on demand. 4.5.2.3.3.1 Filtering (1) Meaning This item is for operating of Filtering to the waveform data loaded.
  • Page 132 <Filter Characteristics> Filter Characteristic is selected. Generally, the default setting of ‘Linear Phase’ is used. ・Butterworth Nth-order Butterworth Filter. How to specify the order N is described after the next clause. ・Linear phase The Linear Filter cuts the components without giving any non-linear phase change to the input signal.
  • Page 133 <Filter slope> This item is defined only when Filter Characteristic is ‘Linear Phase’. The Slope of the attenuation transient band characteristics S[dB/decade] that is correspondent to the order of the Filter is specified. When this item is defined, Filtering process according to the following formula is executed within the objective range.

  • Page 134: Edging

    <Processing> Type to be processed can be specified. ・Edging Half-length-Hanning processing is conducted at front and rear of waveform. For details of Half-length-Hanning, see below. ・Hanning Hanning generates the Hanning function of the defined peak value in the defined region, and multiplies the given waveform data by the function. ・Rotated Hanning Rotated Hanning generates the ‘inverse Hanning’...
  • Page 135 <Window Function> This item can be input only if the previous item is set to ‘Half-length Hanning’. There are two types ; ・Left-side Half This type generates the Hanning function on the left, (start-up half- length), and multiplies the given waveform data by the function. ・Right-side Half This type produces the Hanning function on the right (fall half-length), and multiplies the given waveform data by the function.

  • Page 136: Scalar Calculation

    4.5.2.3.3.3 Scalar calculation (1) Meaning This item is for setting of the calculation between numeral values of the waveform data loaded. When [Scalar calculation] is pressed in the definition dialog, the definition dialog of Scalar calculation appears as below ; <Calculation>...
  • Page 137 <Setting Method> This item defines the objective range to be calculated. ・Region To specify the objective region of the calculation by defining the beginning point and ending point. Select [Objective region] to display the dialog as below. And define the beginning and the ending points that become the objects for calculation.

  • Page 138: Data Length Change

    4.5.2.3.3.4 Data length change (1) Meaning This item is for changing the waveform data length. Select [Data length change] in the definition dialog. The definition dialog of Data length change as below appears. <Processing type> When Data Length of waveform data is converted, the following methods are available ;...
  • Page 139 <Data Length> This item is specified only when Processing type is specified as Data length conversion and is defined a new Data Length R’. In this item, the waveform data of a new Data Length is generated, while Sampling frequency fs is kept unchanged. In other words, the Frame Time T increases or decreases in proportion to the Data Length as follows ;...
  • Page 140 <Objective Region> This item is valid only when ‘Data trimming’ or ‘Data editing’ is set in Processing type. When [Objective Region] is pressed, the dialog box for setting of objective region appears. 4 - 52...

  • Page 141: Csv Data File

    4.5.2.3.4 CSV data file (1) File Format Text File (MS-DOS format) (2) Data Sampling frequency data at each time is described as below in order of time passing. 1st column 2nd column 3rd column Data Name Data Name Data Name 1st line Time (ms) ……...

  • Page 142: Tolerance Definition

    4.5.3 Tolerance Definition (1) Meaning This item is for defining the condition of Tolerance check. It may be happened that the response PSD control to be equal to the reference PSD cannot be obtained as you need depending on the condition of specimen (degree of sharpness in resonance characteristics, having the non-linearity elements, etc.) in vibration test operation.

  • Page 143: Tolerance

    4.5.3.1 Tolerance (1) Meaning The condition of Tolerance check is defined in the whole band in which the reference PSD exists. Tolerance must be set for each test definition. And this Tolerance is called ‘Basic Tolerance’ in the following description. Tolerance is defined by the definition items as below ;...

  • Page 144: Rms Check

    4.5.4 RMS Check This item is for specifying whether the RMS value of the current control response is to be monitored or not during the testing operation. The following two items are provided for monitoring. ① Alarm Check by Response RMS Value This system sounds an alarm when the RMS value of the control response exceeds over (or falls below) the defined value of this item.

  • Page 145: Input Channel

    4.6 Input Channel 4.6.1 Outline In this system, there are three types of response input channel ;. ・Non-gaussian control channel ・Control channel ・Monitor channel <Non-gaussian control channel> In this system, the input channel having the role of kurtosis and skewness control among control channels is called ‘Non-Gaussian control channel’.

  • Page 146: Input Channel Configuration

    4.6.2 Input channel configuration The input channels to be used are set in the definition dialog of input channel configuration. [Add] : A new input channel is added. [Change] : The definition contents of an input channel are changed. [Delete] : A selected input channel is deleted from the registration.

  • Page 147: Input Channel Element

    4.6.3 Input channel element Each input channel element is available to be defined in the display below. The detailed input channel element is to be defined in the detailed definition display. Simplified definition display Detailed definition display 4 - 59...

  • Page 148: This Section Is Left Blank Intentionally

    4.6.3.1 （This section is left blank intentionally.） 4.6.3.2 Specify the abort level of XFR measurement (1) Meaning This item can be set up only when the channel is specified as ‘Non-Gaussian control channel’ or ‘Control channel’. Abort level at XFR mesurement can be set arbitrarily. The default setting value is the 5 times of the peak value of reference.

  • Page 149: Maximum Value Control

    Normally, this weight is set for ‘1’ because each channel should be equally estimated. In this item, the data φ of each channel uses the averaging parameter M and E defined in the fundamental/control condition and is done the averaging operation for each channel. 4.6.3.4 Maximum Value Control (1) Meaning This item can be set only when the given channel is specified as the non-gaussian control...

  • Page 150: Minimum Value Control

    4.6.3.5 Minimum Value Control (1) Meaning This item can be set only when the given channel is specified as the non-gaussian control channel or a control channel. This item is for setting of whether the minimum value control of this current control channel is executed or not.

  • Page 151: Specify The Averaging Parameters To Each Ch

    4.6.3.6 Specify the averaging parameters to each ch. (1) Meaning In this system, all the defined input channels are specified as monitor channels. The input channel specified as a control channel also has the function of a monitor channel. Monitor channels are for monitoring the response itself of the current channel. The monitor response is also observed with averaging as in the same way as the observation of the control response (the response data of the current channel for calculating the control response).

  • Page 152: Monitoring Rms Observing

    4.6.3.7 Monitoring RMS observing (1) Meaning This item is for specifying whether the RMS value monitoring is executed or not at the current input channel. The meaning of RMS value monitoring is the same as that of reference PSD in the item of test definition. RMS value monitoring is the function for protecting the system.

  • Page 153: Use The Observation Profile

    The methods for setting the level which is used as the criteria for the alarm/abort check are as below ; ･Specify the reference relative upper limit ･Specify the reference relative lower limit ･Absolute upper limit In the case of specifying the level by a relative value, because the level of the RMS value of reference PSD is changed by the excitation level, the level of alarm/abort check is also changed according to it.

  • Page 154: Profile Definition

    4.6.3.8.1 Profile definition (1) Meaning This item is for selecting the PSD type. Please refer to “4.5.2 PSD definition type” about the details of PSD definition 4.6.3.8.2 Tolerance definition (1) Meaning This item for defining the tolerance. Please refer to “4.5.3 Tolerance Definition” about the details of tolerance definition.

  • Page 155: Limit By Observation Profile

    4.6.3.8.3 Limit by observation profile (1) Meaning When limit control is set to be executed, the response PSD for the current input channel is monitored during the control operation. If the response PSD of the current input channel is to exceed over the level of the PSD for monitoring set by the absolute value, the function of limit control is activated.

  • Page 156: Analysis Condition

    4.7 Analysis condition 4.7.1 Outline This item is for setting of analysis time and for selecting input channels to analyze kurtosis, skewness, and amplitude probability density. It is also for setting of the maximum display time and interval of trend graph. 4.7.2 Analysis condition Details of conditions needed for each analysis are shown below.
  • Page 157 Setting of trend graph interval is specified.  999:59:59 Input range: 00:00:01 < ΔT Time interval of trend graph is fixed by this setting. 4 - 69...

  • Page 158: Data Save Condition

    Each item for saving the data measured in test operation to the hard disc is defined. In K2 system, all the data measured in test operation are saved in a binary file (*.VDF). Only the data ‘In test operation’ is storable. The data ‘In initial measurement’ can not be saved.
  • Page 159 5. Save after a specified interval This function is for automatic saving of the data on specified time (seconds). (1) Excitation level Set the excitation level to save the data of testing at the set excitation level or higher levels. Set the excitation level for the data to save. If the excitation level has lowered below the setting, the time count of periodic saving will be reset once, and then counted again from 0 second when the excitation level has reached the set level or higher next time.

  • Page 160: Operation Status

    4.9 Operation Status (1) Meaning The information concerning to the excitation operation is displayed in this dialog. Some information in this display are renewed at every control loop time depending on the conditions. < Display Contents > (1) Current status The message of the current status of the system is displayed.
  • Page 161 (6) Real-time processing CPU load factor The current CPU load factor is displayed. (7) Reference data The current control reference level and kurtosis is displayed. When skewness is controlled, ‘Reference skewness’ is displayed. (8) Response data The current control response level and kurtosis is displayed. When skewness is controlled, ‘Response skewness’...

  • Page 162: Chapter 5 Message And Meanings

    Chapter 5 Message and Meanings 5.1 K2Non-Gaussian Error Message Message Meaning / Action Unusual phenomenon is detected (Meaning) in XFR measurement. The test was interrupted because of such reasons as "No response from the control sensor" and "Abnormally great response from the control sensor". The content of error is displayed in Operation status and History window.
  • Page 163 Message Meaning / Action (Meaning) Unusual phenomenon is detected The test operation is aborted due to the error in loop check. by loop check. The detail about the error is displayed at the input channel in which an error detected in Operation status. A) Too much Environment noise is detected.
  • Page 164 Message Meaning / Action (Meaning) Test is aborted by Abort check. The test operation is aborted for an error detected by various abort checks in operation. The content of error is displayed in Operation status. (Action) Check the following points at first. ・...
  • Page 165 ・ The power of I/O unit is not set ON. ・ Between the PC and I/O unit is not connected. ・ Incorrect connection of I/O unit board. ・ Incorrect connection of K2 I/F board. ・ Incorrect action of Driver. Check the above points and retry the testing operation for several times.
  • Page 166 (Meaning) Test is aborted by CPU load. Test operation is aborted because too much loading is detected in operation. (Action) ・ Exit form the other applications than K2 executed by the system when they are used. ・ Decrease value Frequency range Fundamental/Control Condition.

  • Page 167: Chapter 6 Supplemental Explanation

    Chapter 6 Supplemental Explanation 6.1 Set Up <Procedures> Select [Option] in the menu bar and click [Set up]. A dialog of ‘Set up’ appears. ① ② [Transmissibility display unit] This item is for selecting the display unit of amplitude value in Transmissibility Graph. This unit selected in this item is valid only for the transmissibility graphs calculated from the two data giving the same unit.
  • Page 168 6.2 Manual Operation Control Reference can be changed during the excitation operation by using Manual operation bar. Manual operation bar is at right side of window. Manual operation bar If Manual operation bar is not displayed, select [View] in the menu bar and click [Manual operation tool bar].
  • Page 169 < Items in Manual Operation> This item is for setting of an upper Excitation Level by pressing this button once for an increase/decrease value specified This item is for setting of a lower Excitation Level by pressing this button once for an increase/decrease value specified.
  • Page 170 INDEX Ａ Abort check ..............4-56, 4-64, 4-65 Alarm check ..............4-56, 4-64, 4-65 Allowable voltage ............4-20, 4-21, 5-3 Allowance clipping ratio ............4-21, 5-3 Amplitude ................4-45 Amplitude probability density ..........1-2, 1-3, 1-4, 4-68 Analysis condition ..............4-68 Analysis Time ................
  • Page 171 Data editing ..............4-50, 4-52 Data length change ..............4-50 Data length conversion ............4-50, 4-51 Data Save Condition ..............4-70 Drive saving ................4-13 Ｅ Edging .................. 4-45 Environment noise ................ 5-2 Environment setting File ..............2-2 Equalization Mode .............. 4-5, 5-3, 5-4 Excitation level .......3-22, 3-23, 3-45, 3-46, 3-70, 3-71, 4-10, 4-72 Excitation Level Mode ..............
  • Page 172 Level increment ................4-8 Level Scheduling ................. 4-9 Limit by observation profile ............4-67 Loop check ........3-21, 3-22, 3-44, 3-45, 3-69, 3-70, 4-6, 5-2 LPF ..............3-59, 4-31, 4-34, 4-35 Ｍ Manual Operation ..............6-2, 6-3 Max. Observation Frequency ............... 4-3 Maximum value control .............
  • Page 173 Ｓ Scalar calculation ..............4-42, 4-48 Set Up ................... 6-1 Shutdown time ................4-8 Skewness .......1-1, 1-4, 1-5, 1-6, 4-23, 4-25, 4-29, 4-39, 4-57, 4-68 Slope ............... 3-11, 4-27, 4-36 Specify the abort level of XFR measurement ..........4-60 Specify the averaging parameters to each ch..........4-63 Specify the time of XFR measurement excitation ..........

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