Response measurement
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Response measurement
It is mainly the measurement of vibration level. In order to test the operation quality, safety and reliability of the machine, structure or its parts and determine the environmental vibration conditions, it is necessary to measure the vibration magnitude of each selected point and direction of the vibration system under various actual working conditions, and record the relationship between the vibration value and the time change (called time history). For periodic vibration, mainly measure vibration level (amplitude or effective value of displacement, velocity, acceleration or strain) and vibration period; for transient vibration and impact, mainly measure the maximum peak value and response duration of displacement or acceleration; for stationary random vibration, mainly measure the mean value and variance of time course of force and response; for non-stationary random vibration, time can be divided into allowable value In order to find out the relationship between time and mean value and variance of time course in different periods, and take them as the measurement of vibration level.
The vibration speed of many machines is almost constant in a wide frequency range, so the maximum effective value of the vibration speed measured at a selected point on the machine can be used as an indicator of the vibration intensity (called vibration intensity).