中文摘要：

阐述了抛秧机构的工作原理及结构特点。针对抛秧机构相应轨迹与秧苗姿态的要求，提出了非圆齿轮行星系传动机构。建立了该机构的位移、速度和加速度方程，用Visual Basic6．0语言编写了该机构的辅助分析和仿真程序，该软件可显示优化参数、优化目标和主要结构参数，并将优化结果数字化。通过软件分析了主要参数对该机构运动特性的影响，并得出满足抛秧轨迹和姿态要求的最佳机构设计参数。利用优化所得参数建立非圆齿轮有序抛秧机构三维模型并进行虚拟样机试验，其对应的轨迹和姿态满足水稻抛秧作业农艺的要求。

英文摘要：

The working principle and structure of rice-seedling transplanter were introduced in this paper. According to the requirements of corresponding trajectory and posture of the transplanter, the transmission mechanism with non-circular gears planetary was proposed. The equations of displacement, velocity and acceleration of the mechanism were established. Also a computer-aided analytical and simulative program of the mechanism was compiled based on Visual Basic 6.0. The optimized parameters, optimized objections and main structure parameters were displayed in that software. Meanwhile, the optimized results were digitized. The influences of some important parameters on the kinematic characteristics of the mechanism were analyzed by the software. A group of preferable mechanical parameters were obtained subsequently, whose corresponding trajectory and posture could meet the demands of rice transplanting. The 3D model of the mechanism was established on the basis of the optimizing parameters, and then the virtual prototype test was done. Both of corresponding trajectory and posture met the agronomic requirements.