一种新的全轴随机振动试验环境特性研究

Characteristics of a New All-axis RandomVibration Testing Environment

针对新型的可靠性强化振动试验设备——反复冲击机 ,对其全轴进行了随机振动特性研究。对此类非平稳非高斯的多轴随机振动信号 ,建立了全面的数字表征和相关的物理解释 ,并就相应特征与常规试验的电磁振动台进行了比较。结果表明 ,反复冲击机的振动激励从频带范围、峰值分布、应力加载率等方面 ,都明显优于电磁振动台 ,并且反复冲击机的椭球振动能同时施加多轴应力 ,从而有更高的缺陷激发能力。

The all axis random vibration characteristics of repetitive shock machine,a new vibration equipment for reliability enhancement testing, was fully studied. For the nonstationary and non-Gaussian multiaxial random vibration signals, their all-sided mathematic descriptions were extracted and corresponding physical explanations were presented. Moreover they had been compared with conventional Electro Dynamic. The results show that repetitive shock machine is better than Electro Dynamic at the aspects of frequency scope , peek amplitude distribution and stress loading rate, and its ellipsoid vibration can load all-axis stress so as to cause failures effectively.