Test And Parameter Optimization For Commercial Vehicle Cab Suspension System

Due to the policy guidance and the outbreak of Internet economy,the domestic highway logistics industry is booming and heavy commercial vehicles are acting as the main force of road haulage.During the process of line-haul,drivers of commercial vehicles are exposed to harsh vibrations for a long time,the resulting driving fatigue brings hidden dangers of traffic accidents and both the physical and mental health of drivers can be badly damaged.The commercial vehicle cab suspension system can effectively attenuate the vibration energy transmitted to the cab,improve the ride comfort that ensure both the acceleration performance and economic performance.Therefore,to research on the commercial cab suspension system is of great benefits to both customers and manufactures.Firstly,the development history and basic structure as well as function of cab suspension were presented in detail.Ride comfort tests were carried out,and the acceleration data was calculated according to the national standard requirements,with the vibration attenuation rate and the seat acceleration respectively used as evaluation indicators,the vibration isolation performance of cab suspension and the ride comfort were evaluated objectively.In the tests,the acceleration signal collected by the sensors underneath the suspension was transmitted from frame and used as the vibration input of the theoretical model.Secondly,the relevant parameters of the cab were given.Specialized processing for special components such as elastic components and transverse stabilizers was described detailed,after which the theory and method of parameter linearization were introduced.With several simplification of the actual model,a simulation model of cab suspension was established in the ADAMS software based on actual parameters,and several vibration simulations were carried out with the collected vibration excitation as input to verify the accuracy of the ADAMS model.Then,based on response surface methodology,multiple sets of simulation were developed for the design variables.Using the result data of the simulations,two response surface equations of the vibration responses including the vertical acceleration on cab floor and the pitch acceleration at cab centroid were fitted and used.Variance analysis and statistical calculation methods were applied to verify the significance and validity of the equations.Finally,the vibration responses were to be optimized based on the basic theory of multi-objective optimization.The fitted response surface equations were optimized by adaptive particle swarm optimization algorithm.The optimized scheme of parameters was verified by ADAMS simulation,in which the maximum power spectrum density of two responses at 60km/h decreased by 16%.and 17.3% and acceleration decreased by 9.4% and 8% respectively.And the maximum PSD of two responses decreased significantly at the rest speed.The optimization was indicated to have certain effects and the optimization procedure was proved to be feasible with a deviation of 2% between the optimized value coming from ADAMS simulation and the one coming from PSO algorithm as indicator.