Noise Reduction. Spu Silencer - Linde HPR-2 Manual

Noise reduction. SPU silencer

In hydraulic systems pressure pulsations can lead to noise emission. These pressure pulsations are a result of the inherent non-
uniformity of the volume flow in rotary piston pumps. In open loop hydraulic circuits pressure pulsations primarily originate from
within the hydraulic pump during the compression stroke, i.e. when a piston coming from the low-pressure side (suction side)
enters the high-pressure side, where it is suddenly subjected to high pressure. The higher the pump speed and the pressure dif-
ference between the low-pressure and high-pressure side, the more pulsation energy is added to the hydraulic system via the
hydraulic fluid. Pressure pulsations can cause components of the hydraulic system or the machine to oscillate, thereby generating
noise that is perceivable for the human ear.
In principle noise emissions from machinery with hydraulic
systems can be reduced in the following ways:
>> Reduction of operating pressure and speed. This reduces the
pulsation energy introduced into the hydraulic system
>> Primary measures for optimizing the compression stroke in
rotary piston machines with the aim of reducing pulsation
>> Secondary measures such as vibration-optimized design and
installation of machine components and sound-proofing for
noise suppression
Noise reduction. SPU silencer
All Linde hydraulic pumps are optimized with respect to pulsation characteristics and therefore noise generation. In addition to
common primary measures such as exclusive use of pulsation-optimized port plates, Linde Hydraulics offers the SPU silencer for
HPR-02 open loop pumps. Without affecting the functionality and efficiency of the pump, this system reduces pressure pulsations
by up to 70 %, irrespective of pressure, speed or temperature. The SPU system is adaptive over the entire operating range. No
setting up or maintenance is required.
Pressure pulsations with and without SPU
Conventional commutation
Speed [rpm]
10
Noise Generation
System pressure [bar]
Flow Ripple
Pressure Ripple
Fluid Borne Noise
System Excitation
Structure Borne Noise
Noise Radiation
Linde SPU commutation
Speed [rpm]
6
6
6
6
6
System Pressure [bar]