Simulation Analysis On The Effect Of Vibration Seeding Performance Of Rice Bud Seeds Based On Different Moisture Content

The electromagnetic vibration seeding device of rice direct seeding machine is a seeding device that does not harm the seeds,is easy to adjust the seeding rate,has good seed uniformity,and has a simple structure,however,the lack of research on the seeding mechanism and critical moisture content of rice bud seeds with different moisture content of the seeding device is not conducive to further optimizing the parameters of the seeding device and determining the requirements for the water content of the seeding.Therefore,the DEM-MBD coupling simulation method and physical test method were used to carry out electromagnetic vibration seeding analysis research based on rice bud seeds with different moisture content,to explore the seeding mechanism,clarify the critical moisture content of seeding,it is of great significance to the optimization research of the seeding device,and can provide relevant theoretical support for field seeding.In this thesis,the size of the key components of the electromagnetic vibration seeding device is calculated by calculation,and the geometric model of the seeder is established.Based on the three-dimensional laser scanning technology,reverse-engineering modeling of rice bud seeds after cleaning and decontamination is obtained.The accurate appearance model of rice bud seeds,and the discrete element model of rice buds was established by EDEM software,and its discrete element parameters were measured and calibrated.A multi-body dynamics software Recur Dyn was used to establish a rigid-flexible integrated model of the device.Based on this,a coupling simulation of rice bud seedlings and electromagnetic vibration seeder was established by using the method of coupling multi-body dynamics and discrete element method.Model,the coupling model was verified by prototype test.Using this coupled model for seeding simulation experiments,the mechanism of vibratory seeding of rice bud seeds is analyzed,seeding experiments were carried out on rice bud seeds with different moisture content,and conducted impact mechanism analysis.The results show that the modeling method using the rigid-flexible integrated simulation model and the discrete element model of rice buds coupled system model is feasible;during the seeding process,the position of the rice bud seeds in the population can affect their seeding;the moisture content of rice bud seeds increases,and the interaction between rice bud seeds and other objects weakens,resulting in reduced stress and speed of rice bud seeds,and reduced seeding performance;the lower the moisture content of rice bud seeds,the better the seeding performance.When the moisture content is 32.4%,electromagnetic vibration seeding device can normally seeding,but the performance is poor.when the water content is less than 30.3%,meet the requirements of precise seeding.