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提出四连杆机构高阶和复合点阶近似综合的 CAD几何法 .确定机构连杆的位置、速度和加速度与轨迹曲线的点、一阶导数和二阶导数的等效关系 .基于几何约束和尺寸驱动技术 ,构造一个基本四连杆模拟机构 ;再根据机构高阶和复合点阶综合的任务 ,由基本四连杆模拟机构分别构造出高阶和复合点阶近似综合模拟机构 .采用修改尺寸和尺寸动态变化技术 ,检查和分析尺寸变化对机构的影响因素、干涉情况 ,确定机构的理想形状 .计算机模拟结果表明 ,该方法不仅快捷、直观 ,而且具有求解精度高和重复性好的优点 ,为连杆机构的高阶和复合点阶综合提供有效的工具
The CAD geometry method of high-order and compound point-order approximation of four-bar mechanism is proposed to determine the equivalent relationship between the position, velocity and acceleration of the link and the point, first derivative and second derivative of trajectory.Based on the geometric constraints and Dimension drive technology to construct a basic four-link simulation mechanism. According to the task of high-order and complex point integration of the mechanism, a high-order and compound point-by-point approximate simulation mechanism is constructed respectively by the basic four-link simulation mechanism. And the size of the dynamic changes in technology, inspection and analysis of dimensional changes on the body of the factors that interfere with the situation to determine the ideal shape of the mechanism.Computer simulation results show that the method is not only quick and intuitive, but also has high precision and good repeatability advantages, It provides an effective tool for high-order and compound point-order synthesis of the linkage