线性主部
线性主部-
将系统的非线性恢复力表示为线性主部和非线性辅部；
The nonlinear restoring force is expressed into both parts of the linear mainbody and the nonlinear auxiliary .
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给出强非线性自治系统周期振动的频率展开法.该法将动力系统的非线性恢复力表示为线性主部和非线性辅部；
An expansion frequency method for strongly nonlinear autonomous systems is given . The nonlinear restoring force is expressed as both the linear mainbody and nonlinear secondary .