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本文所研究的非线性系统是指其特性能够完全用Ｖｏｌｔｅｒｒａ级数描述的系统。作者在详细推导出单节点－单非线性元件系统的二阶Ｖｏｌｔｅｒｒａ核的函数表达式的基础上，简洁导出了具有任意节点数和非线性元件数的一般非线性系统的二阶Ｖｏｌｔｅｒｒａ核函数表达式。
The nonlinear system studied in this paper refers to the system whose characteristics can be completely described by Volterra series. Based on the derivation of the function expressions of the second order Volterra kernels of the single node - single nonlinear element system in detail, the authors concisely derived the expression of the second order Volterra kernel for a general nonlinear system with arbitrary nodes and nonlinear elements formula.