A linear integral invariant, a universal integral invariant and an absolute integral invariant of second order of the system are obtained under the given condition.

给出系统存在积分不变量的条件，在此条件下导出系统的线性积分不变量、通用积分不变量和二阶绝对积分不变量。

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We can obtain new model reference variable structure control system of second order linear reference model system with common form according to the math model of usual non-linear system.

从一般的非线性系统的数学模型出发，确定出了一般形式的二阶线性参考模型系统的新的模型参考的变结构控制系统。

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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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