如何在Matlab / Simulink中获得未知系统的传递函数（近似值）？
[英]How to get transfer function (approximation) of unknown system in matlab/simulink?
问题描述
I have a unknown system in simulink model (non-linear) and I dont know how to get a TF which will describe it in certain interval of input data. 
我的simulink模型（非线性）中的系统未知，我不知道如何获取TF，该TF将在输入数据的特定间隔中对其进行描述。 Im sorry that im asking such abstract question but im really lost. 对不起，我问了这么抽象的问题，但我真的迷失了。
I tried 'tfest(data,number_of_poles,number_of_zeroes)' Also I tried 'ident' and then import input and output into ident GUI and then click estimate TF. 我尝试了'tfest（data，number_of_poles，number_of_zeroes）'。我也尝试了'ident'，然后将输入和输出导入ident GUI，然后单击估计TF。 Both returned me transfer function which behave completly different than my system. 两者都返回了我的传递函数，其行为与我的系统完全不同。
Im not really sure what input should i generate into system, should the imput be noise? 我不太确定我应该向系统中生成什么输入，输入应该是噪声吗？ I would appreciate any kind of advice or help here. 在这里，我将不胜感激任何建议或帮助。
1 个解决方案
解决方案1
1 已采纳 2014-10-18 14:22:32
If you have Simulink Control Design, you can use the Frequency Response Estimation functionality or linearise your Simulink model around an operating point . 如果您具有Simulink控制设计，则可以使用频率响应估计功能或在工作点周围线性化Simulink模型 。
You probably need to provide more information (data, code, etc...) as to why tfest and ident didn't work. 您可能需要提供有关tfest和ident无法正常工作的更多信息（数据，代码等）。 There are a lot of different models and options available within the system identifcation GUI, it may just be a matter of choosing the correct one. 系统识别GUI中有许多不同的模型和选项可用，可能只是选择正确的模型和选项而已。
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