| Air suspension has the ideal nonlinear elasticity characteristic, because of its low natural frequency, stiffness and the height is adjustable, caused the domestic and international numerous automobile suspended frame attaches great importance to the researchers, at the moment, the air suspension is widely used in passenger cars and commercial vehicles.In this paper, it takes an air suspension of a heavy tractor as the research object, firstly,it introduces the work principle and structure characteristics of the air spring, and polynomial mathematical model of air spring is analyzed, and makes bench test for the air spring and damper.Secondly,it establishes the rigid-flexible coupling model of leaf spring suspension and an air suspension and the whole vehicle model,and writes the Matlab pavement program by using the harmonic superposition method,and then makes the ride comfort simulation by using ADAMS/Car under random and pulse pavement input.Finally,it uses the response surface method of ADAMS/DOE in experimental design (RSM) fit approximately quadratic polynomial model between the driver and the saddle of weighted acceleration RMS value and the stiffness of air spring and shock absorber damping,and integrates the approximate model into Excel components by using multidisciplinary design optimization software Isight, and forms the multi-objective optimization problem, and optimizes the two objective function by using the non-dominated sorting genetic algorithm (NSGA-II) at the same time, the objective function of optimal solution are obtained.At the end of the paper, the air spring stiffness and shock absorber damping after the optimization matching are generated into the ADAMS model to comparative analysis the vehicle’s ride comfort, through the comparison, the optimized scheme could effectively improve the riding comfort of vehicle,and the optimized scheme is verified feasibility. |
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