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机械结构或系统的固有特性有两种求法,一是由结构动力学的理论借助于有限单元法求解:另一种方法是用试验的方法,由激励和响应求解。至于试验方法,除频域的实模态或复模态分析方法外,又发展了时域的时间序列方法,只由系统响应求系统特性。试验方法虽在理论上比较成熟,但限于工程中具体条件和现有仪器及设备,对于复杂的大型结构求其模态存在一定的困难。既使求出了,也应与理论求出的结果做一比较。这里以图1所示
There are two alternatives to the inherent properties of a mechanical structure or system. One is to solve the problem with the help of the finite element method from the theory of structural dynamics: the other is to use experimental methods to solve them by excitation and response. As for the test method, in addition to real-mode or complex modal analysis methods in the frequency domain, time-domain time-domain methods have been developed, and the system characteristics are obtained only by the system response. Although the test method is relatively mature in theory, it is limited to the specific conditions in the project and the existing instruments and equipment. There are certain difficulties in obtaining the modalities for the complicated large-scale structures. Even if calculated, it should be compared with the theoretical results. Here is shown in Figure 1