| For semi-tractor,its suspension system contains chassis suspension system and cabin suspension system.They are key shock absorbing assemblies of a vehicle.Rough road may cause impact and vibration on the vehicle in the driving,and if its vibration frequency doesn't match with the inherent frequency of human being's,the ride comfort will be reduced.Moreover,impact and vibration may also cause fluctuation of wheel dynamic load,and then make damage on the road surface further.Therefore,the research on the performance of different chassis system and cabin suspension system combinations is critical for improving modern vehicle performance and safety.Ride comfort and road performance is contradictory.A reasonable suspension parameter setting,multi-target optimization,better parameter combination are all needed for reaching a better ride comfort and road performance.Multi-target optimization aims to find an optimized combination for suspension system.All parameter settings in the combination can be used as an independent optimized setting.Different setting is for different performance.Semi-tractor is a complicated assembly;all system can relate and affect each other.Suspension system not only affects ride comfort and safety,but also driving and steering.Therefore,it is necessary to use the vehicle performance impact comprehensive evaluation method.First,the professional evaluation of the performance of the vehicle under operating conditions by a professional driving engineer to determine the suspension system parameter value range;then the use of multi-objective optimization algorithm in the determination of the value range Find the optimal solution set and determine the optimal combination of multiple parameters.Finally,the professional driving team evaluates the subjective comprehensive performance evaluation and objective testing of the determined multiple optimal parameter combinations,and selects a set of optimal parameter combinations to improve the vehicle.While driving comfort and road safety,take into account other performance.The paper tries to analyze the vibration characters and its suspension system parameter optimization under typical event for commercial heavy semi-tractor:1)Analyze vibration character of vehicle suspension system and its conduct path,and then find out the suspension parameters which affect ride comfort further.Analysis shows: the contribution of shock absorb parts to the cabin floor ranked from high to low is front suspension mount,rear suspension,rear suspension mount,and front suspension.It is difficult to improve ride comfort by just optimizing one s part or assembly.Therefore,it is suggest improving ride comfort of semi-tractor by optimizing entire suspension system2)For defining the premium issue with MOPSO,MDPL is introduced as the guideline.By improving MOPSO,MDPL-MOPSO is provided.And its contribution on distribution diversity and astringency improvement is confirmed by test and application stimulation.3)Optimize suspension system of a semi-tractor under typical event based on multi-objective particle optimization analysis algorithm,the paper confirms different optimization combination for different suspension system and different performance target.4)Select several parameter settings from the optimized combinations,and revise suspension stiffness and damping with image driving.Optimized the parameter further based on suspension theory,and confirm a best parameter combination for steering,driving,ride comfort and road safety.After subjective analysis,it finds out that all performance indexes are improved greatly.No only ride comfort and safety are improved,but also vehicle performance is improved. |
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