In non - conservative system, what is the propagation speed of waves is unclear.

在 非 保守系统中, 波的传播速度还是个不十分清楚的问题.

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The one is the nonlinear free oscillation of conservative system.

其一是保守系统的非线性自由振动;其二是参数振动.

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It is called force system if non - conservative force changes with the deformed configuration in conservative system.

非 保守系统是指载荷在使物体发生位移和变形的过程中,其输入功与路径有关的系统.

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