气动式振动台激励信号及其超高斯特性研究

EXCITING SIGNALS AND THEIR SUPER-GAUSSIAN CHARACTERISTIC OF REPETITIVE SHOCK MACHINES

气动式振动台是一类新型可靠性强化振动试验设备,它能够产生三轴六自由度超高斯随机振动环境因而具更高的缺陷激发效率。然而,由于商业竞争和技术保密等原因,目前国内尚未开展气动式振动台设计的关键技术研究。以该类设备的关键部件——气锤为切入点,在全面掌握气锤工作原理的基础上,推导得出活塞与气缸发生一次性碰撞时产生的碰撞信号理论解析式,并验证了理论分析的正确性。在此基础上,结合工程实际仿真生成了气锤在持续稳定压力作用下产生的激励信号,进一步研究了该激励信号的超高斯特性,探索了气动式振动台超高斯随机振动环境生成的直接原因,为全面研究和改善气动式振动台的性能奠定了基础。

Repetitive shock (RS) machines are a new kind of equipment, are widely used in the reliability enhancement testing of electronic assemblies. Because RS machines can provide a 3-axis random vibration environment, they have higher testing efficiency. However, the key technics of RS machines have not been studied in detail as yet in our country due to a lot of limits. Here, vibrators which are crucial components of RS machines are regarded as the specific objects. Based on mastering work principles of vibrators roundly, impact signals are studied deeply and their analysis formulas are derived in detail. Then, the theoretic results are validated by tests. Finally, the exciting signals generated by vibrators are simulated and their super-gaussian characteristic is studied to seek the forming cause of the random vibration environment of RS machines.