Design And Optimization Of Rice Intelligent Seed Test Platform Based On DEM-CFD Coupling

Rice seed testing is a crucial aspect of rice cultivation and breeding,primarily focusing on the collection and analysis of metrics such as panicle length,the number of filled grains,the number of unfilled grains,primary branch numbers,and secondary branch numbers.Typically,rice seed testing data collection relies heavily on manual methods.However,the extensive workload involved can easily lead to fatigue and errors,which subsequently affect the accuracy of seed testing results.To address the current challenges in seed testing operations,ensure high-quality rice production,and enhance the accuracy and efficiency of rice panicle trait detection and seed selection,this study employs a DEM-CFD coupling method to design an intelligent rice seed testing platform.The main work of this research includes:(1)Overall structure design of the intelligent rice seed testing platform:The study analyzed the requirements of the rice seed testing system and assembled the hardware components of the intelligent rice seed testing platform.Using SolidWorks software,the overall structure of the rice seed testing platform was constructed,and the working principle of the intelligent seed testing platform was explained The platform’s working principles and technical parameters were determined,including panicle length detection system,branch number recognition system,single plant threshing system,grain screening system,filled grain number recognition system,and platform control system.Relevant components were selected and optimized.(2)Design of the rice seed testing platform control system:A comprehensive machine control system was designed based on the working requirements of the intelligent rice seed testing platform.Utilizing Wecon LX3V-1412MT4H-A(D)PLC as the core controller,along with the LX3V-2ADI-BD signal acquisition module,whole-machine control of the seed testing platform was achieved.Systems for panicle length detection,branch number recognition,single plant threshing,grain screening,filled grain number recognition,and platform control were established,with test results output through the host computer.The hardware and software systems of the rice seed testing platform’s lower computer were designed,as well as the human-machine interaction interface of the seed testing platform.(3)Research on panicle length detection system design:A panicle length detection system was designed using Lab VIEW as the upper computer and Wecon PLC as the lower computer.Through the coordinated control of stepper motors and various actuators,the force sensor was used to provide force feedback on the panicle,realizing the automatic seed testing of panicle length information.The platform’s various workflows were automated.Through serial communication,the connection between the Lab VIEW interface and the PLC was achieved,and an interactive interface was designed,enabling the setting of various work parameters,the display of the working status of each execution structure,and the real-time display and data playback of panicle force and panicle length information.(4)Grain screening system design optimization:The structure size and spatial position of the grain screening system were determined,and a secondary regression test was designed for structural optimization.The structure and working principle of the rice grain screening system ware introduced,and the rice grain screening process was analyzed.A new screening system was designed to address the problem of low screening accuracy and high workload for filled and unfilled grains in single plant rice threshing tests.Combining aerodynamics and the discrete element method to analyze the motion state and separation results of filled and unfilled grains in the flow field,a four-element quadratic regression orthogonal rotation central combination experiment was conducted,based on experimental methods and theoretical analysis.Section width,inlet wind speed,horizontal distance,and vertical distance were considered as influencing factors,with the goal of maximizing the cleaning rate.The optimal parameters were section width 75.44 mm,inlet wind speed 8.90 m/s,horizontal distance 198.78 mm,vertical distance 34.87 mm,and a cleaning rate of up to 99.6%.The experimental results indicate that the seed testing platform can automatically measure rice panicle length,perform precise threshing,and screen and count the number of filled and unfilled grains.This seed testing platform is well-suited for conducting research on rice crop panicle seed testing.