基于虚拟样机运动学仿真的割草机喂草导向装置参数优化
Parameter optimization of disc lawn mower grass feeding guide device based on dynamic simulation ofvirtual prototype

针对果园常见的单株生长的较粗难切割的杂草，设计割草机的专用喂草导向装置。联合CREO和ADAMS建立喂草导向装置与杂草的刚柔耦合模型，并对杂草在喂草导向装置喂草口角度和前进速度不同的情况下的运动规律进行分析。根据杂草顶端点在空间坐标系中X、Y、Z轴方向上的位移变化相关关系获得杂草的偏移夹角、割草机的理论最大割幅和割茬偏移等3个重要指标，来表征喂草导向装置的工作效果。使用Design Expert 10.0进行试验设计，试验结果表明，最优的方案为：喂草口角度为80°、机器前进速度为1 330 mm/s，此条件下喂草导向装置的工作效果良好，割茬平整，最大偏移量为27.02 mm。
A special grass feeding guide device for the disc lawn mower was designed for the coarse and difficult to cut weeds that are commonly grown in the orchard. Combined with CREO and ADAMS,the rigid flexible coupling model of grass feeding guides and weeds was established,and the movement laws of weeds in the case of grass feeding guide device with different angles and advance speeds were analyzed. According to the relationship between the displacement of the weed tip point in the X,Y and Z directions of the space coordinate system,three important indicators including the offset angle of the weed,the theoretical maximum cutting width of the mower and the cutting offset were calculated to characterize the working effect of the grass feeding guide device. Using Design Expert 10.0 software,a comprehensive test was designed,and the response surface effects of the three indicators were analyzed,and the experiments were verified and compared. The results showed that the optimal angle of the grass feeding port was 80°,with the machine forward speed of 1 330 mm/s. At this time,the grass feeding guide device worked well with flat cutting and the maximum offset of 27.02 mm