Optimization Design Of Airflow Arrangement Device For Shiitake Mushroom Based On Dynamic Modeling And Simulation

In recent years,the growing production of shiitake mushrooms and the increasing demand for technology in the mushroom industry have placed increasing demands on the modern mushroom food processing industry.Automated stipe and root trimming can effectively shorten the pre-processing time of mushroom food processing,reduce the storage time of mushrooms and provide better edible taste to consumers.To address the problem of consistent mushroom posture in the trimming stipe and trimming root production line,this paper proposes a novel method using airflow to arrange mushroom,which can achieve the requirement of consistent mushroom stipe orientation to improve the processing efficiency of trimming and separation.This paper will focus on the design of airflow arrangement device for mushroom,dynamic modeling of mushroom,the application of dynamic model in virtual reality technology,establishment of aerodynamic coefficients,and Monte Carlo parameters optimization.Firstly,the designed model of the trimming and separation device is established by SolidWorks 3D modeling software,and the model of airflow arrangement mushroom is produced by 3D printing manufacturing method,which is combined with the designed airflow control system to build the experimental platform of airflow arrangement for mushroom.The experimental results proved that the device can adjust the posture of the mushroom without damaging the surface of the mushroom and keep it in a stable state with the stipe upward in the airflow.In order to theoretically analyze the function of the device,a dynamic model of the shiitake mushroom in the airflow is established to analyze its motion state in the flow field and thus evaluate whether the method is rational and feasible.Given that the theory of dynamic equations is well developed and has been refined and improved to show better applicability in solving dynamic change laws,the Newton-Euler equations are used in this paper to calculate the motion parameters of the mushroom.Virtual reality technology is conducive to the visualization of the motion state of shiitake mushrooms.Therefore,virtual reality is applied to the dynamic model of this study to facilitate the observation of the changing process of shiitake mushrooms.Aiming at the problem that the calculation of the equations of motion requires the forces and moments of the mushroom in the air flow,this paper calculates the forces and moments for different mushroom postures at each wind velocity based on the computational fluid dynamics method,and obtains the aerodynamic coefficient of the mushroom.Combined with the linear interpolation method selected in this paper as the establishment method of the look-up table,a look-up table of the aerodynamic coefficients of the shiitake mushroom is established to achieve the purpose that output the force and moment of the mushroom when the wind velocity and the attack angle of the mushroom are input.At the same time,the force and moment as the input of the equation of motion can derive the motion parameters of any wind velocity,and the motion parameters are feedback to the input of the dynamic model to finally obtain the motion state of the mushroom.After the dynamic model presents the relationship between the state of motion of the mushroom and the airflow,it is demonstrated that the needed steady state of the device is to make the stipe of the mushroom maintain pointing up.Comparing the different initial states and their corresponding motion states,it is concluded that the mushroom is more stable with its stipe pointing up when it rotates and falls into the ventilation duct.Then the device is optimized by Monte Carlo simulation method,and the displacement interval when the stipe is up in the simulation results and the number of the stipe up in the interval are analyzed,so as to make the mushroom achieve a higher probability of stipe upward with appropriate ventilation duct length and wind velocity.It is finally shown that the designed airflow arrangement device for mushroom in this paper can be effectively used for mushroom arrangement,and it can also improve the efficiency of mushroom arrangement without bruising the mushroom body.At the same time,machine vision can be applied to the designed device,which can not only detect the posture of shiitake mushrooms but also track the position of shiitake mushrooms in real time,which is convenient for further application in trimming and separation equipment.