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目前有三种在概念上不同的载荷频谱试验技术。这三种技术的共同点是试验都是在使用载荷的总频谱控制下进行的。它们的不同点在于载荷频谱复现的方法不同。实际载荷频谱的复现可以有三种不同的方式,第一种是用一个预定的试验程序来模拟载荷的历程,这就是所谓的程序疲劳试验(比较图1中的Ⅰ和Ⅱ);第二种是把整个使用载荷的变化完全复现出来,这就是所谓的使用复现试验(比较图1中的Ⅰ和Ⅲ);第三种是用人工制造的振动来合成实际载荷
There are currently three conceptually different payload spectrum testing techniques. What all three technologies have in common is that the tests are performed under total spectral control using the load. The difference between them is that there are different methods of spectrum re-loading. There are three different ways to reproduce the actual load spectrum. The first is to simulate the course of the load with a predetermined test procedure. This is the so-called program fatigue test (compare I and II in Figure 1). The second Is to completely reproduce the change in the entire service load, which is the so-called use of recurrence test (compare Figure I and III); the third is the use of artificial vibration to synthesize the actual load