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前言通过遥测,我们知道弹上仪器、设备的振动环境是随机性的,但现行的振动试验条件几乎都是正弦的,最早是单频耐振,后来发展为正弦扫描。由于正弦扫描试验使试件在较宽的频域中经受了考验,所以比单频耐振有比较大的进步。然而用正弦振动模拟真实的随机振动环境要有一个前提,即对试件来说正弦和随机振动引起的效果在某一方面是相等的。关于正弦振动与随机振动之间存在不存在等效关系这一点,国外早在五十年代初就有人从事这方面研究,一度成为热门研究工作。人们希望找出正弦与随机之间的等效准则,
By telemetry, we know that the vibration environment of the equipment is random, but the current vibration test conditions are almost all sinusoidal, the earliest is the single-frequency vibration resistance, and later developed into a sine scan. Due to the sinusoidal scanning test to test the specimen in the wider frequency range has been tested, so than the single-frequency vibration has a greater improvement. However, there is a premise to simulate the real random vibration environment with sinusoidal vibration. That is to say, the effect caused by sine and random vibration to the test specimen is equal in some aspect. On the sine vibration and random vibration there is no equivalent relationship between this point, as early as the early 1950s, some people engaged in research in this area, once a popular research work. People want to find the equivalent criterion between sine and random,