Co-simulation Optimization Of Loader Cab Mounting System

A Long-time exposure to low frequency and sharp vibrations makes construction machinery a bad influence on drivers’ health.With the rising demand for comfortable working condition,vibration and noise reduction become a hot spot of science research.Matching an appropriate passive mounting system will make a great contribution to construction machinery’s NVH performance.This thesis is supported by National Science and Technology Support Program: Vibration and Noise Reduction Technology Research and Application of Construction Machinery.It focuses on loader machine,which is one of the largest demanded construction machineries,optimal designs the rubber mounts of cab mounting system through the method that combines simulation with experiment,and provides technical routes for fast design of cab mounting system.The acceleration signals of wheel loader’s key points have been measured under typical operating conditions,in which the signals under cab mounts were inputted as vibration exciter in CAE model.The analysis of isolation ratio and frequency response function indicated the needs for improving vibration isolation performance of the mounting system.Based on the cab’s correct model and finite element model,the structure mode has been computed and verified with SIMO mode test.Multi-body dynamics model was built in Adams and control system was finished in SIMULINK,they compose the co-simulation system.The multi-objective optimization chooses the vibration total value of weighted R.M.S acceleration’s minimization and decoupling ratio’s maximization as the objectives.Multi-objective particle swarm optimization(MOPSO)algorithm has a better performance than non-dominated sorting genetic(NSGA-Ⅱ)in this co-simulation optimization,according to contract of two groups of Pareto solutions.One of the Pareto solutions is chose to do more research to confirm the feasibility and effectiveness of the co-simulation approach for mounting system design,improve the cab’s NVH performance,and redesign rubber mounts for the target loader.