Modeling Suspension System And Optimizing Reliability Test Method Of Light Bus

Combined with the formulating method of the performance evaluation and reliability optimization test for lightbus performance evaluation and optimizing reliability test method and standard test.the research is carried out in the paper, the key research projects of China FAW group corporation.The ADAMS software is used to build the suspension system simulation model and optimization calculation for steering trapezoid.These neural networks were offered for the damp control with Matlab/Simulink. The results show that the variation of suspension damping can control yaw and cornering property on road surface with big adhesion coefficient, the increasing of the front suspension damping and the decreasing of the rear suspension damping can obviously reduce the load shift of the front and rear wheel, and the vehicle over-steering behavior is restrained effectively, and a new control method is provided for the improving vehicle steering stability.The simulation model for lightbus is set up using.Analysis durable road surface with the vehicle and tried to mark the vehicle after the fatigue of the trauma timed rubbed the right road traffic injuries. Mts six passage of vehicles and the coupling system of the experiment to the traffic on the modal and frequency. The model of Automobile Powertrain is build based on fatigue mechanism,basquin of S-N and the equivalent of formula zero stress on an average data processing with Goodman. Optimization the test by the rain-flow counting method on the same load, the proportion of durable way is justly distributed.1) Suspension kinematic characteristics and control strategyThe ADAMS software is used to build the suspension simulation model. Optimize the change amount with the front-wheel and lightbus tracks. The results show that the front wheel orientation parameters changes are less before and after optimization, and all they are within the design requirement ranges. The changes of the wheel-center-distance and front wheel side slippage are bigger, and are still within the ideal ranges after optimization, the anticipated optimization goal is achieved, and an important basis is provided for the improving design of the light vehicle suspension.Base on the change amount of suspension is coefficient importent influence on acceleration, Move to produce cantilever deflections and wheel load. Build BP neural networks PID control algorithm and front and rear suspension to restrain oversteering and impoving the Vehicle handling and steering.2) Performance analysisUsing the method of template-based dynamic, to build front suspension template,tire and steering system.it can rapid and convenient amending the scheme by making full use of template-based dynamic in this paper.the models by the assembly into multiple level, topology relationship of subsystems.to take vehicle handling and for an example, the results of simulation agree well with that of credibility of the model is verified and tests so the practicability,the result of research shows that it can be used in the modeling suspension system and optimizing reliability test method of light bus3) The rear axle fatigue properties and modal respondenceContrast Fatigue damage on the rear axle from the testing lightbusTo the vehicle with roughness road, washboard road, Comprehensive Specifications road, sandy soil road, highway Freeways and urban roads. It was analyzed according to differences Vibration Frequency by frequency of vertical vibration and the relation. Provide reliable data for the quality improvements on the rear axle.4) Reliability test project for automobile powertrainWith the basic concept of damage mechanics and S-N Curve Basquin Equation, it is used to simulate the mean stress not equal to zero with the Goodman Formula, acquire load distribution matrix by rain-flow cycle counting. draw fatigue life curve in age by Manson-Coffin Equation. based on the same fatigue damage to establishe related mathematical model between the typical to the durable road, to estimate proportional coefficient by method of least square.5) Test data processing and optimization methodsEliminate the abnormal value and term tendency from testing data based on acquisition correct load time signal.Using the Rain-flow counting method to process test data and arrivalling optimization test conditions and test methods on the strengthened roads, these all based on principle of the same load on road between Customer correlation pavement and the strengthened roads and mathematical model of Automobile Powertrain.Aim at the problems exists in technology and method of reliability test, the method can avoid the test blindness and set up a science and reasonable matching to durable road surface proportion. It is provides an effective method to study the product type of new cars reliability test.