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It is very important to choose the characteristic quantity in vibration measurement!
December 20, 2016 source: navigation instruments Author: Editor
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Vibration characteristic selection during measurement:
There are three characteristic quantities of vibration, namely displacement, velocity and acceleration. The sensors, vibration measuring equipment and measurement methods are different according to different measurement characteristics.
Therefore, it is necessary to consider which characteristic value should be selected as the evaluation value of vibration intensity. It is generally believed that:
① At low frequency, the vibration intensity is proportional to the displacement;
② In medium frequency, the vibration intensity is proportional to the velocity;
③ At high frequency, the vibration intensity is proportional to the acceleration;
For the motor, the main frequency range of vibration is medium frequency. Therefore, the vibration speed is usually regarded as the evaluation quantity of whether the motor vibration is normal. The national and international standards of motor also stipulate that the vibration speed is the evaluation quantity to divide the vibration level and specify the vibration limit value of the motor.
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