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在没有频率特性测试仪的情况下,我们常常只好用逐点地改变信号源频率,测量系统在该频率下的响应的办法来研究系统的频率特性。频率特性测试仪使用方便,但价格昂贵。逐点测量法.有利于同学们搞清频率特性的定义和物理概念,但测量工作繁琐且不能直观地看到频率特性曲线。在实施“机械工程测试技术基础”课时,我们用了一些实验室常用仪器,给同学做了频率特性的演示。通过演示,帮助同学们搞清了频率特性的定义和测量方法。如果实验室没有测量频率特性的专用仪器,那么这个方法也不失为研究机械或电系统频率特性的一种较好的方法。下面分别简单介绍机械和电系统频率特性的演示方法。
In the absence of a frequency characterization tester, we often have to study the system’s frequency characteristics by changing the source frequency point-by-point and measuring the system’s response at that frequency. Frequency characteristics tester easy to use, but expensive. Point by point measurement method is conducive to students to clarify the definition of frequency characteristics and physical concepts, but the measurement is cumbersome and can not intuitively see the frequency characteristic curve. In the implementation of “Mechanical Engineering Test Technology Foundation” class, we used some of the laboratory equipment used to give students a demonstration of the frequency characteristics. Through the demonstration, to help students find out the definition of frequency characteristics and measurement methods. If the laboratory does not have a dedicated instrument for measuring frequency characteristics, this method is a good way to study the frequency characteristics of mechanical or electrical systems. The following briefly introduces the mechanical and electrical system frequency characteristics of the presentation.