Application Research On Vehicle Handling Stability Using ADAMS

PrefaceWith the deeper understand of the automobile, the consumer have higher require to the quality,not only its dynamics and economics, but also handling and ride. More powerful technology and methods meet them. As the main CAE analysis method, multi-body system dynamics analysis apply with the digital-model build by CAD/CAM software, can finish one project in several hours which may need several weeks or months. More significative, during the premier time, the designers can study how the designs work, research them analysis result effectively, decide the right project. With the application of multi-body system dynamics in the digital-model, the expediently, rapidly and reasonably research becomes realism. With the develop of computer technique, it is very realistic and economic to simulate the character of the studied system. The multi-body system dynamics, which based computer technique, provides a powerful tool to build multi DOF vehicle model. Studying with the multi-body system dynamics, the vehicle is described as many parts, each part is rigid body or finite element, though the model incarnates the system character wholly. Though it can be used to study the performance of handling, ride and so on.The software ADAMS, which developed with multi-body system dynamics, is the most fashionable and authoritative software in the field of mechanical dynamics simulation. The digital model is defined as product 100% digital design using the integration technique of CAD/CAM/CAE. When build models in ADAMS, in traditional way, we need offer many parameters, such as upspring mass, the center of mass, inertia parameter values, and so on. In order to acquire these values, we must do many experiments or do many calculations. It leads to waste time and human power. Using digital model, we can offer the needed parameters. In this thesis, we build 3-dimension digital model in CATIA software, then translate it into ADAMS through the format Parasolid and other methods. The transfer between multi-body system dynamics and digital model is realized, then we can use multi-body system dynamics technique to study the digital model.Main ContentsIn chapter 1, the internal and external status quo of multi-body system dynamics research is investigated, research and development methods, up-to-date achievements and developing trends of multi rigid body system dynamics and multi flexible body system dynamics are discussed, and the concept of digital model, and the computer simulation theory and common software ADAMS are introduced.In chapter 2, introduce the preparative tasks with the deeper understand of digital model. Class the preparative tasks to build the digital model. Study the methods of getting the needed parameters according to the experience and need. Do the research of method to transfer the digital model to multi-body system dynamics, in order to build the detailed multi-body model.In chapter 3, the main design configuration of front and rear suspension model. Based on the kinematics model, kinematics simulations are carried out and the results are analyzed for different design configurations. From the analysis of kinematics simulation results,The experiment also proved this configuration is the best. We study that the analysis of different design configurations can be carried out easily using digital model.In chapter 4, based on the specialty of every subsystem, the front suspension model, driveline model, multi-line suspension model, shock absorber model and tire/road model are developed respectively. Then, they are integrated into a whole vehicle dynamic model. Verify the validity of the dynamic model using the test data. According to the road test standards, simulations are carried out based on the multi-body model to investigate vehicle ride and handling performances. The results are compared with those road performances. The model is validated well by field test results, and the experiments proved the effectiveness of the detailed multi-body model for the design of the suspension. In chapter 5, set up the whole vehcile modle,and use the model to analysis the handing stablity and meanwhile ,using the model analyisis the rear suspision reaction . In chapter 6, the contents and conclusions are summed up. Also some advice on the improvement of the later research is given.Significance1. Absorbing the ADAMS software and mastering the general process to build the detailed multi-body model are beneficial to the later researcher, which is the theory basis for the futurestudy.2. Based on the study of some kind light bus, bring forward several different design configurations to widen the front suspension, apply the multi-body system dynamics to digital model, carry out full simulations of the whole vehicle, put forward the design configuration in point, design and analysis the modified components.3. Carry a face of multi-body system dynamics cooperate with the digital model based on the predecessors study. With it, the design of new products and redesign of old products have a new effective method, can effectively shorten the time of developing production consumedly, can save the funds of trial-manufacture physical prototype by using this technique.