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在设备的环境试验中,常常采用波形很简单的冲击脉冲,而且几乎无法对冲击试验中试件的冲击谱量级进行控制。本文介绍一种振荡冲击激励法,通过一个选定的频率范围进行快速扫描,以达到控制冲击谱量级的目的。当采用这种激励时,对具有分布质量和分布弹性的试件(像电子元件),可用很简单的理论来精确预计,各模态中所产生的峰值应力,而且通过改变激励信号的形状就可以准确而容易地控制模态响应。
In equipment environmental tests, it is common to use very simple waveform impulses, and it is almost impossible to control the magnitude of the impact spectrum of the test piece in an impact test. This article describes an oscillatory shock excitation method that scans quickly through a selected frequency range to achieve the goal of controlling the magnitude of the shock spectrum. When this kind of excitation is used, it is possible to accurately predict the peak stress generated in each mode for a specimen (such as an electronic component) having a distributed mass and a distribution elasticity by using a very simple theory. By changing the shape of the excitation signal Modal response can be controlled accurately and easily.