Systemization of Simulation Software of Dynamical System by JavaBeans

作者提出了一种利用JAVA语言构件软件构建动力系统仿真软件的方法。构件软件按构成动力系统的时空、体和力三种类型进行分类。该软件系统所能处理的范围仅限于粒子系统的平面运动。每个物体（一个质点）在作用于物体上的力之间交换信息，物体通过四阶龙格-库塔公式得到下一个状态。整个系统作为运动方程的解算器作为一个联立微分方程通过在整个系统中同步地这样做。即使不会用JAVA语言编写程序的用户，也可以在合适的JAVA语言开发环境下使用这些组件编写动态系统仿真程序。该工具具有以下特点。介绍了两种接触力。一个是作用在两个物体之间的接触力，另一个是作用在物体与平面之间的接触力，接触碰撞和受约束的运动可以看作是在这些力作用下的运动。2：在与构形空间相对应的窗口上显示物体的运动，在另一个窗口上显示系统动态能量的时间依赖关系、物体的各种物理量的时间依赖关系和物体的两个物理量之间的关系的时间依赖关系。3：当用户利用该工具制作出某一粒子系统的仿真软件后，自动生成粒子系统的运动方程。

The auther developed a method to constitute simulation software of dynamical system from component softwares of JAVA language. The component softwares are classified in three types corresponding to space-time, body and force which are constituents of dynamical system.. The range to be able to treat of this software system is limited to plane motion of a system of particles. Each body (a material point) exchanges information between the forces which act on the body and the body gets the next state by 4th order Runge-Kutta formulas. And the whole system functions as Solver of equations of motion as a simultaneous differential equations by doing this synchronously in the whole system. Even if a user who can't write a program by JAVA language can make programs of simulation of dynamical system by using these components under suitable development environment of JAVA language. This tool has the following characteristics. 1 : Two kinds of contact forces were introduced. One is a contact foce to act on between two bodies and the other is a contact force to act on between a body and a plane, and a contact collision and a constrained motion can be treated as motions under action of these forces. 2 : The motion of bodies is displayed on a window corresponding to a configuration space and graphs to show time dependence of dynamical energy of the system, time dependence of various kinds of physical quantities of a body and time dependence of relation between two physical quantities of a body are displyed on another windows. 3 : Equations of motion of the system of particles are made automatically when a user have made the simulation software of a certain system of particles by using this tools.