Shock Absorber Model Based On The Bouc-Wen Model And The Flow-model And The Influence On Vehicle Dynamic Simulation

Shock absorber- the main damping element on vehicle suspension system which is so important to safety and comfort of the vehicle has a very significant impact on performance, the shock absorber oil in the main characteristics of the media is very complicated, not only as the basic flow of fluid dynamics and fluid compression feature but also includes affected by temperature and the design of damper parameters also more complicated it is difficult to precise, on the shock absorber structure modeling and performance analysis has been a hot topic in automotive industry and difficult.Damping force from vibration and vehicle performance is another focus of discussion.With the development of simulation tools for special operations is based on Matlab, Carsim and Adams as the representative, such software has a very strong mathematical ability and a very friendly developer interface. Development and vehicle in the car during the experiment, more and more use of simulation software to create a parametric model of car parts for pre-development and design, simulation software very intuitive analysis can not only describe the parts of the parameter values of The performance of the simulation module and can direct the various components together and vehicle simulation to analyze the changes in a part of the design parameters of a vehicle performance will produce what kind of impact, which would then guide the design and pre-well development.Modeling the development process in the absorber from the initial linear model developed to Segal, who later established by the 83 parameters with the oil viscosity-temperature characteristics and make similar considerations damper model [1], but simplified outside the actual shock absorber model is very different characteristics and accurate calculation of the model is too complicated and the structure of the modeling process valves are fitted through the experimental method and the empirical parameters of the approximation, so it engineering application does not have a better practicability. Focus of this study is to analyze the main shock absorber features a variety of external causes and their corresponding structural parameters of the valves, and external characteristics of different shock absorber on the vehicle performance discussion. In the second chapter describes the basic working principles of shock absorber and shock absorber performance of its external characteristic curve and the corresponding relations. In the third chapter introduces the definition of flow coefficient, the establishment of the flow of shock absorber model, consider the diameter of shock absorber valves mid-stream factors (process loss and partial loss) and parameter adjustment method and analyzed through simulation. In the fourth chapter, through the establishment of Bouc-Wen model is based on the shock absorber characteristic curves to express the shock absorber in the external characteristics of the actual hysteresis hysteretic characteristics of the shock absorber mainly by squeezing the oil, viscosity temperature characteristics and other factors impact so by adjusting and optimizing the Bouc-Wen model can be built close links with the hysteresis model and practice outside the shock absorber characteristic curve. Before the fifth chapter in the design flow using Bouc-Wen model and the models were simulated in Carsim environment, both models can build a better analysis of the control group 1), the hysteresis loop with no external characteristic hysteresis loop on the vehicle performance 2) The link with hysteresis damping under the conditions of the same vehicle with different damping force on the performance of 3) recovery stroke compression stroke damping force shock absorber under different values of external characteristics of 4) external features and damper force have hysteresis loop in simulation。...