Consider the distributed parameter system described by the second order partial differential equation of composed type, we discuss its a boundary optimal control problem with quadratic performance.

考虑用二阶复合型偏微分方程所描述的分布参数系统，研究了它的一个使平方性能指标达到最小值的边界最优控制问题。

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This paper proves the existence, uniqueness and periodic problem of the solution about second order singular perturbation system by using the differential inequality.

本文用微分不等式证明了二阶奇摄动系统解的存在性、唯一性和周期性。

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The driveline for a tractor vehicle is simplified as a 2-DOFs(degree of freedom)torsional vibration system, and is described as a second-order differential equation.

将牵引车的传动系简化为一个2自由度的扭转振动系统，并以二阶微分方程描述。

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