关键词: 振动与波, 微振动, 评价指标, 均方根速度, 评价曲线

Abstract: The generic criterion for random microvibrations has a significant application in hightech field, such as vibrationsensitive precision facilities. First of all,the meansquareroot velocity of random micro vibration is introduced as a criterion. Different from the usual displacement and acceleration of vibration, this criterion describes both the statistical characteristics and centrefrequency effects of random disturbances. Then five microvibration levels are defined for disturbing environment according to various vibration sensitivities and requirements. And the corresponding uplimits and frequency spectrums of the meansquareroot velocities are given. Finally, application of the criterion, the meansquareroot velocity, is illustrated through an example of disturbing environment.

Key words: vibration and wave, microvibration, criterion, meansquareroot velocity, criterion curve