介绍了WMS2000型轮机仿真器中轴带发电机系统的工作机理、仿真系统设计及数学建模方法，并给出了部分具体数学模型。
This paper briefly introduces the principles of shaft generator in WMS2000 engine room simulator, the methods of designing and modeling, and some detailed mathematical models.
论述了经济系统中数学模型的建立问题，并对数学建模过程进行了理论分析。
This paper discusses how to construct the mathematical model in the economical system, and analyzes the process of modeling in theory.
但是，采用传统的数学建模方法，很难得到精确而又简单的数学模型。
However, it is very difficult to get the accurate and simple mathematics model adopting the traditional mathematics modeling method.
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