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一问题的提出在导弹或宇宙飞船——运载火箭的整个飞行过程中,由于各级发动机点火,关机,级间分离,天线罩抛射等动作造成仪器仓内各种设备的瞬态环境。这种环境的特点是:(1)加速度时间历程是复杂振荡型脉冲。(2)作用时间很短(以毫秒为单位)。(3)加速度幅值较大而速度和位移较小。十几年来,对这种瞬态环境的试验模拟一直是以冲击响应峰值等效为原则的。但冲击的破坏机理较复杂,冲击谱相同的脉冲并不一定引起相同的破坏。因此为了更真实地模拟瞬态环境,除了满足冲击谱的要求之外,必须使模拟波形尽量接近瞬态环境。国外对瞬态环境的模拟早期是用跌落式冲击机产生半正弦单脉冲。由于这种脉冲环境和
A problem raised During the whole flight of a missile or spacecraft - launch vehicle, the transient environment of various equipment in the instrument warehouse is caused by such actions as ignition, shutdown, interstage separation and radome projection at all levels. The characteristics of this environment are: (1) Acceleration time history is a complex oscillatory pulse. (2) The action time is very short (in milliseconds). (3) The acceleration amplitude is larger and the speed and displacement are smaller. For more than a decade, the experimental simulation of this transient environment has been based on the principle of peak equivalent impulse response. However, the mechanism of impact damage is more complicated, and impulses with the same impact spectrum do not necessarily cause the same damage. Therefore, in order to more truly simulate the transient environment, in addition to meeting the requirements of the shock spectrum, the analog waveform must be brought as close as possible to the transient environment. Foreign simulation of the transient environment is the early use of drop-type impact machine to produce a half-sine single pulse. Due to this impulse environment and