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对多项式非线性系统进行模态分析，并由此对非线性系统频响特性的零、极点频率进行分析。此方法不受非线性强弱的限制。
The modal analysis of the polynomial nonlinear system is carried out, and the zero and pole frequencies of the nonlinear response of the nonlinear system are analyzed. This method is not limited by the strength of the nonlinear.