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系统的动特性分析,主要指根据分析任务作系统输入信号的选型;作数据采集装置的选型;确定数据处理方法;按试验分析法的特征组织试验程序等一系列工作,统称试验设计。针对目前开展该项工作存在的问题,本文以频率特性为例,①说明开展频率分析的人员组织,和建立试验装置的准备工作的内容与步骤,指出现代各种频谱摄取方法的共同任务;②通过频率试验的直测法与相关法实例对比,说明相关技术排除随机噪声干扰提高试验数据准确性原理;③论述数据采集装置的设计使用原则及维护经验,提出合理使用的建议。
The analysis of the dynamic characteristics of the system mainly refers to the selection of the input signals for the system according to the analysis tasks; the selection of the data acquisition device; the determination of the data processing method; and the organization of the test procedures according to the characteristics of the test analysis method. In this paper, we take the frequency characteristics as an example to illustrate the existing problems in this work. Firstly, we describe the organization of the personnel who carry out the frequency analysis and the content and steps of the preparatory work for setting up the experimental device, and point out the common tasks of various modern spectrum ingestion methods. Through comparing the direct test method of frequency test with the related law example, it shows that the relevant technology eliminates the random noise interference and improves the accuracy of the test data. Thirdly, it discusses the principle of design and maintenance of the data acquisition device and puts forward the suggestion of reasonable use.