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基于系统响应瞬时特性的非线性系统识别

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Indexed by:期刊论文

Date of Publication:2017-05-25

Journal:大连理工大学学报

Included Journals:CSCD、Scopus

Volume:57

Issue:3

Page Number:221-226

ISSN No.:1000-8608

Key Words:瞬时频率;归一化Hilbert变换;广义过零法;非线性系统识别

Abstract:在Krylov-Bogoliubov-Mitropolski(KBM)法的基础上,提出一种基于系统响应瞬时特性的非线性系统识别方法.该方法通过建立系统响应瞬时特性与系统参数之间的函数关系,从而一次性识别出所有系统参数.采用归一化Hilbert变换(normalized Hilbert transform,NHT)和广义过零(generalized zero-crossing,GZC)法求解信号瞬时振幅和瞬时频率,通过算例验证了两种方法的效果.以Duffing方程和Vanderpol方程两类非线性振动系统为例,验证了所提系统识别方法的精度.算例表明,即使在系统响应受到较大噪声污染时,该方法也有很好的识别精度.

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