The damping ratio is an important characteristic parameter in a second-order system, which has great effect on the dynamic characteristic of the second order system.

阻尼比是二阶系统的一个重要的特征参数，它对二阶系统动态特性有较大的影响。

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The vehicle steering system is a slowly varying non-linear system, in a short time interval, its dynamic characteristics can be described by a parameter-varying second-order linear system.

汽车转向系统是一个缓慢变化的非线性系统，在一个较短的时间间隔内，可以用一个参数时变的二阶线性系统对其动力学特性进行描述。

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The existence of a homoclinic orbit for a singular second order planar Hamiltonian system is proved by using variational methods.

用变分方法证明了二阶奇异平面哈密顿系统的同宿轨道的存在性。

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