The Simulation Analysis And Optimization Matching Of Commercial Vehicle Cab Air Suspension System

Along with the rapid development of our country automobile industry and the enhancement of the living standard, the automobile has already become an essential and important tool in our daily life. The commercial vehicle as the national economical construction important tool has been gradually obtaining people's attention. Nowadays, people's request to improve the riding comfort commercial vehicle is increasing intensely. The cab's riding comfort is obtaining more and more people's attention and the researches on the vibration isolation of cab suspension system are deploying and embedding gradually.In this dissertation, the national 863 project"The integrated development advanced technology of high quality heavy commercial vehicle"is combined with an actual development project which is related to a particular model commercial vehicle cab air suspension system of a certain automobile company, and the particular model has established using the ADAMS software. One the basis of verifying the model, the simulation performance has been carried on. Using the transmissibility of the cab air suspension system as the evaluating indicator and applying the DOE technology which combines with the orthogonal experimental design to optimize and match the key parameters which affect the cab air suspension system's vibration isolation performance. The result indicates that the optimized parameter matching program improves system's vibration isolation performance and the DOE technology which combines with the orthogonal experimental design is feasible and effective.The dissertation is divided into seven chapters:In chapter one, the importance of the cab suspension system for improving the cab's smoothness and riding comfort is introduced firstly, as well as the cab suspension system's definition, classified, the main function, the commonly used elastic elements and their characteristics. Then the development situation of the commercial vehicle cab suspension system both at home and abroad is presented. Finally elaborates the dissertation's research objects, the significance and the main research contents.Chapter two introduces virtual prototype technology, mainly including the development, the main mission, the research methods of the multi-body system dynamics which is the academic basis of virtual prototype technology, as well as the steps using the multi-body system dynamic theory to solve automobile dynamics actual problems. In addition also introduces the ADAMS software, including the software's characteristics, the module classification and the primary algorithm theory.Chapter three introduces air spring's type and characteristics firstly, and then introduces the related experiments of the cab air suspension system as well as the experimental process, the methods and the results. The related experiments of the cab air suspension system include air spring elastic property test, vibration absorber damping property test, the mass center and rotor inertia measuring of the cab and the cab air suspension system modal test.Chapter four introduces the procedure of establishing cab air suspension system virtual prototype model. Firstly introduces the structure of the sample vehicle's cab air suspension system, and then introduces the methods of modeling, the parameters and the ways to obtain parameters. Next introduces the establishing procedure. Finally carries on the confirmation to guarantee the accuracy of the model and lay the foundation for the next vibration simulation analysis.Chapter five carries on the vibration simulation analysis of the cab air suspension system. Firstly introduces the realization of the vibration analysis in ADAMS, and then introduces the subjective and the objective assessment methods which appraise automobile vibration. Through the contrast between the above two assessment methods determine to use the objective assessment method and the cab air suspension system's transmission characteristics to carry on the qualification analysis. Finally introduces the general process of the vibration simulation analysis in ADAMS and carries on the simulation analysis also to analysis the simulation results.Chapter six carries on the optimization matching to the cab air suspension system. Firstly introduces the parameterization design in ADAMS and the orthogonal experimental design. Then introduces the DOE analysis process which combines with the orthogonal design and according to the related process to carry on the analysis. Finally uses the range analysis method to dispose the experimental results and through compares the DOE analysis and the range analysis's matching program to determine the final optimization matching program.Chapter seven is the summary of the full dissertation, mainly elaborates the research work, the conclusion as well as the research prospects.