CAJ | 학술논문

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。
위게시파충장치투충궤리，판별도충적손상솔，해문채용제이랍격랑일방정건립료투충과정도충적동역학모형，통과방진획득료도충운동속도수수직위이적변화규률，병이용고속섭상기술대도충투충과정진행료재선박섭，획득료도충투충과정운동속도수위이적변화규률，통과시험결과여이론결과적대비분석，가지，투충과정중도충적운동규률주요수도번판장도、번판질량、도충질량등삼수적영향，기운동속도수위이적증가이정비선성체증，당수직위이위27 mm시，도충운동속도분별위0.54、0.45、0.34、0.29화0.18 m/s，위구도충투충후여앙반적팽당력제공수거，종이위판별도충적손상솔제공이론의거。
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.