基于电动振动台的强化试验剖面参数计算与控制

Parameters Calculating and control of Reliability Enhancement Testing Profile based on electric vibrating table

在进行组件级产品振动试验时,传统试验方法存在产品的低阶振动模态激发能力较弱,试验结果重现性差,而采用低频特性优良的电动振动台及其控制仪进行应力加载则可克服RS机的缺陷。本文给出了基于电动振动台的随机振动试验剖面的数学描述,推导出应力量级和试验应力谱参数的解析关系,进而导出便于工程应用的剖面参数计算方法, 并讨论了应力剖面的控制。最后在某导弹发射控制盒组件的振动强化试验中进行了应用,验证了该方法的有效性。

When module level product is experimented vibration test by traditional experimental method, there exist weakly low order vibration modal initiation capability and the repeatability of test results is not good. But adopting electric vibrating table of low-frequency character and its control instrument to feed stress can overcome the shortage of Repetitive Shock. Firstly, The mathematic description of random vibration test profile based on vibrating table is provided. Analytic relationship of stress magnitude and test stress spectrum parameters is deduced and the method for calculating parameters of reliability enhancement testing （RET） profile is obtained, secondly, the control of stress profile is discussed. The application of the method in the RET of some missile firing device verifying its effectiveness in the end.