The Research On Biomimetic Mechanism Design And Its Application Based On Monitor Lizard

With the continuous development of bionics technology,more and more engineering fields begin to use the ideas and techniques of bionics to solve the problems in engineering practice.At present,in the field of agricultural machinery,with the advance of agricultural mechanization,a large number of agricultural production work has been replaced by mechanical equipment,but the problems such as high resistance and high energy consumption of mechanical earth-touching parts used for production work have not been effectively solved.As the largest lizard,komodo dragon has the instinct ability of digging holes in reptiles.Its huge size makes it have higher requirements for the volume of holes,and its digging behavior is closer to the movement of agricultural digging parts.In this paper,bionics theory and technology are used to improve the existing mining and harvesting equipment,so as to achieve the goal of reducing resistance and energy in modern agriculture.The main research contents and conclusions of this paper are as follows:The claw of komodo dragon,a large cave creature,was selected as the bionic research object,and the three-dimensional reconstruction of the claw model of komodo dragon was carried out with the idea of reverse engineering.In MATLAB software,curve fitting was carried out for the obtained contour point cloud data.By using the bionic curve function,four types of bionic shovels are designed for different two kinds of shovel tips and a threedimensional model was established.By analyzing the mechanical properties of the soil and the digging shovel model,the traction resistance was calculated to be 107.25 N.Based on the static analysis of the bionic excavator using ANSYS workbench software,the maximum stress value of the bionic excavator is 101.36 MPa,located around the bolt hole for fixing,the maximum shape variable is at the position of the shovel tip,and the deformation value is 0.06 mm,which conforms to the structural design strength requirements.In order to compare the drag reduction effect of each bionic shovel laterally,the finite element analysis model of the blade cutting motion in soil was established by using ls-dyna software and its display dynamics was simulated.Then digging shovel in the analysis of various types of soil in the process of cutting motion resistance curve,the results show that the bionic digging shovel digging performance than ordinary digging shovel is to ascend,but because in the process of analysis,shovel chip trajectory movement condition does not conform to the engineering practice,the result can only evaluate shovel its mechanical characteristics,so don't have accurate evaluation on engineering significance.The EDEM discrete element software was used to build the excavation-soil model to compare the dynamic simulation results.Firstly,the model parameters were selected and the contact mechanics model was set up to complete the simulation analysis of soil cutting movement with five shovels.The results show that the results of the shovel resistance are slightly different from those of the display dynamic analysis,and the reasons for the difference between the results of the discrete element analysis and the display dynamic analysis are analyzed.The drag reduction rate of the bionic shovel is 91.3%,and the soil crushing rate of the bionic shovel is 7.5% higher than that of the ordinary shovel.The analysis of soil kinetic energy further proves the reliability of bionic excavator in improving performance.For the biomimetic excavator with the best performance in the simulation,the structure design dimension diagram was drawn and the 3D printing model was made.In order to carry out the random fatigue life analysis of the shovel,the modal analysis and random vibration analysis of the shovel were carried out first,providing data support for the subsequent research.A biomimetic cotton picking device and a biomimetic clamping device were designed based on the shape and movement characteristics of the head of the monitor lizard,providing new inspiration for the design of mechanical automation device.This study provides a theoretical basis for the development of a new bionic shovel and a new solution for improving the drag reduction and soil breaking performance of agricultural machinery touching the soil.