Simulation Analysis And Optimization Of Excavator Cab-seat Suspension System

The excavator is wildly used in the engineering construction.The performance of its cab not only affect the service life of its parts but also be in relation to the driver's comfort and work efficiency.So the vibration isolation performance of the excavator cab is taken seriously by consumers,and it's an important way to enhance the competitiveness of the market.The existing vehicle cab isolation study usually took the cab as the main body,and established dynamic model for the sake of simplicity,but ignored the influence of the seat isolators.In this paper,considering the influence of the seat isolators,double quality 12 free degrees dynamic model was established in order to research the human body discomfort caused by unreasonable design of the cab-seat suspension system.Then the model was analyzed and optimized,the system decoupling rate was raised when the frequency was matched to improve the vibration isolation performance of the suspension system.In this paper,the main contents were as follows:(1)According to the structure and vibration of the cab,an evaluation scheme about body vibration in the engineering vehicle was summed up.Rigid body vibration mechanics model and mathematic model of the cab-seat suspension system were set up.(2)Adams software and Matlab software were used to solve the intrinsic characteristics of suspension system respectively,and the results of both were compared,and the results pointed out direction of the optimum design of the suspension system.The simulation analysis in time and frequency domain were done to analyze the dynamic characteristics of the suspension system for further more.(3)The objective function,design variable and constraint condition of the cab-seat optimization design was determined.The perimeter study and sensitivity analysis of the of the model was done.The SQP simulation optimization algorithm in the Adams/view was used to solve the optimization problem.The results before and after optimization were compared,and showed that the distribution of natural frequency and the energy decoupling rate were improved significantly.(4)Because it was difficult to guarantee the accuracy of the static stiffness of rubber isolator from craft in actual production,the monte carlo method was used for robustness analysis,and it confirmed that the robustness of the optimized scheme was high.