[工学]基于组合式正弦波的控制系统动态特性测试.doc

摘要 控制系统的动态特性包括时域特性和频域特性，频率特性测试在控制的动态特性测试和建模中具有重要意义。本课题研究了伺服系统的动态特性测试中在进行频域特性测试时所采用的激励信号类型及其相应算法对测试结果产生的影响，并针对伺服系统的特点，用DELPHI语言编写相关软件，然后在嵌入式工控机硬件平台上运行，实现伺服系统的动态性能测试。 首先，在Matlab上仿真，本课题着重研究三种激励信号，分别为正弦信号、Chirp信号以及Multitone信号，将此三种信号作为输入信号，分别加入到某伺服系统中，得到输出信号，然后，在Matlab上运用包括相关分析算法、FFT算法以及功率谱算法的数据处理算法对数据进行处理，得到伺服系统的频率特性仿真结果，并以正弦扫描信号采用相关分析算法为基准，观察其余测试信号在对控制系统进行测试时的测试精度问题。 然后，编写系统动态性能测试软件，包括信号的产生、采集以及数据处理算法的编程实现，利用该软件，可以得到在实际系统中，伺服系统的频率特性，该软件界面友好、功能完善。能够完成本课题所需的相关功能。 最后，将在实际系统测试得到的结果与在Matlab仿真上得到的结果进行比较，观察理论与实际的区别，并得到相关的结论。 关键词：动态性能测试，激励信号类型，数据处理算法，频域特性 Abstract The Dynamic performance of Control system including Time Domain performance and Frequency domain performance, It’s meaningful in the Dynamic performance test and modeling based on the test of the characteristics on the frequency domain. In this subject, the author discussed the influence on the frequency domain caused by the type of Input signal and Algorithm when we test the Dynamic performance about the servo system, and then, programmed related software under Delphi Language and run on in the embedded control computer according to the characteristics of the servo system, in this way, we complete the servo system’s Dynamic performance test. Firstly, I simulated on the Matlab,produce three kind of necessary singles cared about in this subject,including sinusoidal signal、Chirp signal and Multitone signal, and made these signals as input signals to a servo system, Then we obtained the output signal. After that, applied data processing algorithms including Correlation Analysis、FFT algorithm and Power Spectrum algorithm on the Matlab to get the characteristics on the frequency domain. We assume the Correlation Analysis which applied on the sinusoidal signal is perfectly then we get the accuracy about other signals appiled for different data processing altorithms. Secondly, compiled the dynamic performance test software, including gererator signals, collect signals and data processing algorithms. This software friendly a