系统动力学模型用结构展现系统行为，因此，系统动力学的重点是发现结构。

System dynamics model shows the deed of system with structure and the focal point of system dynamics is to find structures.

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本文研究石油机械企业多产品生产的规划决策问题，运用系统动力学的原理建立了相应的系统模型。

This paper researches the planning and decision making problem of petroleum mechanical multiproduct enterprises, and establishes the corresponding system model by using systematic dynamic principle.

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在此基础上分析了操作臂的运动学和静力学关系，建立了并联柔性系统的动力学模型。

Then, the kinematics and statics of the manipulator are studied, and a dynamic model of this parallel flexible system is established.

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