本文首先介绍向量键图,然后介绍用向量键图建立机械系统模型的方法。该方法从机械系统的速度描述入手,导出速度的统一表示方法,以此做为建立机械系统结点结构的基础,然后在此基础上利用功率守恒概念,在结点结构上加入多端口元件,得到机械系统的向量键图模型。由这种模型便于导出机械系统的状态方程和进行系统仿真。文章最后用一个速度陀螺为例介绍了此建模方法的具体应用。 This article first introduced the vector key map, and then introduced the use of vector key map to establish a mechanical system model. The method starts from describing the speed of the mechanical system and derives a uniform representation of the speed, which serves as a basis for establishing the node structure of the mechanical system. Based on this, the concept of power conservation is used to add multi-port elements to the node structure, Get the mechanical system of the vector key map model. From this model it is easy to derive the state equations of the mechanical system and to simulate the system. Finally, the article uses a speed gyro as an example to introduce the concrete application of this modeling method.