水稻植质钵盘精量播种装置投种过程的动力学分析

水稻植质钵盘精量播种装置投种过程的动力学分析
陶桂香;衣淑娟;毛欣;刘海燕;王睿晗;冯金龙
【期刊名称】《农业工程学报》
【年(卷),期】2013(000)021
【摘要】为揭示播种装置投种机理，判别稻种的损伤率，该文采用第二拉格朗日
方程建立了投种过程稻种的动力学模型，通过仿真获得了稻种运动速度随竖直位移的变化规律，并利用高速摄像技术对稻种投种过程进行了在线拍摄，获得了稻种投种过程运动速度随位移的变化规律，通过试验结果与理论结果的对比分析，可知，投种过程中稻种的运动规律主要受到翻板长度、翻板质量、稻种质量等参数的影响，其运动速度随位移的增加而呈非线性递增，当垂直位移为27 mm时，稻种运动速度分别为0.54、0.45、0.34、0.29和0.18 m/s，为求稻种投种后与秧盘的碰撞力提供数据，从而为判别稻种的损伤率提供理论依据。

%Based on the combination of agricultural machinery and agronomic requirements, bowl dish precision seeder for rice must guarantee 3~5 rice seeds dropped into a hole. For this reason, researching on motion law and revealing the investment mechanism of bowl dish precision seeder for rice in dropping process can help improve the dropping rate and reduce the damage rate
of bowl dish precision seeder for rice. The second Lagrange multiplier can be used to describe the dynamics of mechanical systems with highly uniform rules in the theory, methods, forms and application. The second Lagrange multiplier provides the programming method for solving the dynamic problems of a unified system. The method not only has important
theoretical significance and practical value in mechanics, but also provides the physical idea and mathematical skills necessary for the study of modern physics. As a consequence in this paper, based on the dynamics analysis, the dynamics model of bowl dish precision seeder for rice in the dropping process was established by the second Lagrange multiplier. To obtain relationship between resultant velocity and displacement of bowl dish precision seeder for rice in dropping process, the dynamics model was simulated by Matlab with the parameters that the cylindrical hole diameter is 10 mm, the shaped hole thickness of 4 mm, the material of the flap is polycarbonate, the length of the flap is 14 mm, the heavy of the flap is 0.82 g, varieties of rice is Kongyu 131, and kilo-grain weight is 39 g. The results show that characteristics of rice motion on dropping process are affected by certain factors such as flap length, shutter quality, and rice quality. The rice velocity presents nonlinearly increase with the displacement. At the beginning, the rice moving more slowly, rate of increase becomes large with the displacement increases. When the actual displacement is 27 mm, rice velocity is 0.54, 0.45, 0.34, 0.29 and 0.18 m/s respectively. In the same conditions,the process of dropping of bowl dish precision seeder for rice was photographed on line by the high-speed photography, and the relationship between resultant velocity and displacement of bowl dish precision seeder for rice in dropping process was obtained. Compared with the theoretical results, it shows that the general trends of rice are the same. In the first place, rice moving more slowly, rate of increase becomes large with the displacement increases. When the actual displacement is 27 mm,
rice velocity is slightly different, which is 0.5, 0.42, 0.32, 0.26 and 0.17 m/s respectively. The similarity degree is greater than 90%with a gentle curve of speed, no fluctuation by simulation, nonetheless the fluctuation by the high-speed photography. The results show that rice seeds in the actual dropping process can be affected by many inevitable factors, such as rice attitude change, data collection error in the dropping process and so on. The results can provide a theoretical foundation for improving the dropping rate of precision sowing device in rice seeding bowl.
【总页数】7页(P33-39)
【作者】陶桂香;衣淑娟;毛欣;刘海燕;王睿晗;冯金龙
【作者单位】黑龙江八一农垦大学工程学院，大庆 163319;黑龙江八一农垦大学工程学院，大庆 163319;黑龙江八一农垦大学工程学院，大庆 163319;黑龙江八一农垦大学工程学院，大庆 163319;黑龙江八一农垦大学工程学院，大庆 163319;黑龙江八一农垦大学工程学院，大庆 163319
【正文语种】中文
【中图分类】S223.2+3
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