Honda G100K2 Applications Manual page 29

VIBRATION
NATURAL FREQUENCY
The frequency of a vibration system (spring + weight)
is determined by the strength of the spring and the
weight. This frequency is unique to that particular
vibration system and is called a natural frequency.
The stronger the spring, the higher the natural
frequency.
The lighter the weight, the higher the natural
frequency.
The amplitude varies by the external force exerted on
the weight: the natural frequency does not.
RESONANCE
Resonance is a condition in which the frequency of the vibrating force coincides with the natural frequency of the
vibration system.
Vibration
amplitude
Resonance point
Motor
Excessive vibration
Normal vibration
Engine
speed
The amplitude of the weight movement is relatively
small when the frequency of the vibrating force is
low.
The amplitude increases as the frequency is
increased.
When increasing the frequency, the amplitude
reaches the maximum at the specified frequency;
the natural frequency of the vibration system.
This is the state of resonance and the frequency at
that state is called the resonant point.
If the frequency is increased further beyond the
resonant point, the amplitude starts to decrease
gradually.
On engine powered applications, it is indispensable
to identify the resonant frequency and to separate it
far from the working speed and idling speed range
of the equipment.
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