In past , the processing mode as to the electro - hydraulic servo - system nonlinear problem is that using the tai ' s lux formula obtains the part linear pattern behind the series expansion at the stable state work - point . this kind of linear model is feasible to this system the frequency is low as well as the system work - point frequently isn ’ t changing in great scope 过去对于非线性问题的处理方式是在稳态工作点处进行泰勒级数展开后得到局部线性化模型,这种线性化模型对于一些频宽不太高、系统的工作点变化范围不太大的系统是可行的。