Performance Analysis And Stability Study Of Lightweight Micro Track Chassis

China is one of the countries with the most frequent natural disasters,and the rescue of people’s lives and property has become extremely urgent after disasters occur.A fast and efficient rescue and relief device is the key to ensuring the quality and efficiency of rescue.Due to the complex and narrow terrain at the disaster site,it has hindered the rapid entry of largescale rescue engineering equipment into the core disaster area to clear obstacles.Rescue personnel often use the method of first disassembling and then assembling,which seriously affects rescue efficiency.Therefore,develop a lightweight micro tracked chassis that can be equipped with power sources and rescue tools,analyze its static and dynamic performance based on finite element and multi body dynamics theory,study the influence of mass and oil dynamic load on the driving stability of the lightweight tracked chassis,and conduct performance experimental verification.The main research content is as follows:(1)Complete the lightweight design and structural optimization improvement of the micro track chassis.By selecting lightweight materials,the key components of the chassis walking device such as the gear train and frame are lightweight.According to the topology optimization,the optimal shape characteristics of the frame are obtained,and the structure of the frame is improved by using the optimization of the weight reduction holes,the optimization of the section of some beams,and the local optimization design.(2)ANSYS software was used to conduct finite element analysis on the chassis frame models of the tracked chassis under four classic working conditions,and the dynamic performance was analyzed using the multi body dynamics software Recur Dyn.Solve the maximum stress and strain cloud maps of the chassis frame under different working conditions,and analyze and verify the strength and stiffness of the frame.The modal analysis results of the chassis frame verify the rationality and stability of the frame structure.The dynamic simulation analysis results indicate that the maximum driving speed of the tracked chassis meets 5km/h,and the maximum climbing angle of the tracked chassis should be less than 35°.(3)Study the static stability,longitudinal dynamic stability,and lateral dynamic stability of a lightweight micro tracked chassis equipped with a hydraulic source.Based on the torque balance equation,the position of the center of mass of the tracked vehicle is determined,and the maximum slope angle for longitudinal and transverse static stability is theoretically calculated to be 35°.The climbing performance of the fully loaded mass tracked chassis is verified using the Solidworks software motion module.Analyze the impact of quality on the dynamic stability of tracked vehicles,and simulate and analyze the effects of fuel tank filling ratio,initial speed,and initial braking deceleration on the longitudinal stability of tracked vehicles under emergency braking conditions using FLUENT software,as well as the effects of fuel tank filling ratio and lateral acceleration on the lateral stability of tracked vehicles under sudden turning conditions.(4)Conduct verification tests on the dynamic stability,static stability,driving speed,and climbing performance of lightweight micro tracked chassis.Establish a hydraulic source tracked vehicle dynamic stability experimental platform and data detection system.The tracked vehicle brakes at different initial speeds,and the effective braking deceleration change trend is basically consistent with the simulation results,meeting the longitudinal stability requirements;The lateral angular displacement of the tracked vehicle when turning at different lateral accelerations is far less than 5°,meeting the lateral stability requirements.The experiment also verified that the tracked vehicle can smoothly climb and stably park on a 31° slope,and the maximum driving speed on a horizontal road surface can reach 5km/h.