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在飞机发动机零部件的疲劳寿命研究中,因试件种类繁多,故要求所设计的试验机的电液伺服系统和加载承力机构必须具有很强的适应性、良好的动态特性。但因各被试件差异甚大,动力机构又较为复杂,呈多自由度系统,往往给系统特性带来不良影响。因此,在系统设计中,搞清其动特性是十分必要的。为此,我们采用了宽带激励与正弦扫频方法,运用FFT分析技术进行了大量的试验研究工作,较理想地获取了系统的整体与局部动态特性,建立了系统的数学模型。
In the study of the fatigue life of aircraft engine parts, the electro-hydraulic servo system and the load-bearing mechanism required by the designed testing machine must have strong adaptability and good dynamic characteristics because of the large variety of specimens. However, due to the great difference among the tested specimens, the motive force is more complex and has a multi-degree-of-freedom system, which often brings adverse effects on system characteristics. Therefore, in the system design, to find out its dynamic characteristics is very necessary. To this end, we use a wideband excitation and sine sweep method, the use of FFT analysis of a large number of experimental studies, the ideal access to the overall and local dynamic characteristics of the system to establish a mathematical model.