Research On Modeling,simulation And Experimental Analysis Of A Steering System For Passenger Cars

With the rapid development of modern automobile industry,people put forward a higher demand for the performance of the vehicle in terms of driving stability,operational accuracy and safety.This puts forward higher requirements for mechanical stability,modeling and simulation and optimization analysis of steering system.In the optimization analysis of the mechanical system,first of all,the target mechanical system should be modeled.Second,the target mechanical system model should be optimized.And then,the optimized model should be processed into finished products.Finally,the finished product should be tested on the bench in order to verify if it is available to meet national standards.In this process,the accuracy of modeling directly affects not only the results of optimization analysis,but also the size and quality of the components.If the model is not accurate,then the optimized model and trial production will also be inaccurate.In this thesis,firstly,the established steering system model in the ADAMS system was simulated and analyzed.At this time,The target steering system was tested on the bench.The results of simulation analysis and bench test were compared.According to the comparison results,the computer model of the steering system was modified.The model was added to the No-load torque parameters,so as to made it closer to the actual system.Finally,the modified model was optimized in ADAMS to get the best optimization result.The stability of the angular velocity of the output shaft of the steering system plays a decisive role in the stability of the vehicle.Whether the input shaft and the output shaft of the double-axis universal joint in the steering system can rotate at constant speed has a significant effect on the stability of the output angular velocity of the steering system.In this paper,the motion analysis of single-axis universal joint was studied.And the motion analysis of double cross shaft universal joint was studied after it.In two cases have been shown to be able to achieve a constant rotation of the double cross shaft universal joint of the steering system.In the first case,the first input cross section of the double cross shaft universal joint perpendicular to the planein which the input shaft and intermediate shaft are located and the second input cross section of the double cross shaft universal joint parallel to the plane in which the intermediate shaft and output shaft are located.In the second case,the first input cross section of the double cross shaft universal joint parallel to the plane in which the input shaft and intermediate shaft are located and the second input cross section of the double cross shaft universal joint perpendicular to the plane in which the intermediate shaft and output shaft are located.An example of a steering system of a certain vehicle model optimized with this conclusion is showed in this paper.