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现代动态测试和试验技术(如电液伺服材料和构件试验机)已经能够相当精确地将实际测得的随机工作载荷在实验室中予以再现。根据随机过程的性质,在任何时间长度内记录下来的随机信号都是唯一的,就是说随机载荷的时间历程是不能用确定的数学函数来描述的。因此试验机的随机加载虽然可以精确模拟构件的工作状况,从而可以使试验结果符合实际,但是带来了两个问题:第一是随机工作载荷的实测很费时间,而且需
Modern dynamic testing and testing techniques, such as electro-hydraulic servo materials and component testers, have been able to reproduce the actually measured random working loads in the laboratory with considerable accuracy. According to the nature of the random process, the random signal recorded in any length of time is unique. That is to say, the time history of random load can not be described by a definite mathematical function. Therefore, although the random loading of the testing machine can accurately simulate the working condition of the component, the experimental results can be in conformity with the actual results. However, two problems arise from the random loading of the testing machine. The first is that the measurement of the random working load takes a lot of time,