Research On Matching And Optimization Of Three-cylinder Mounting System Based On OPAX Method

As the market and environment demand for automotive emissions is increasing,low-power,high-torque three-cylinder engines are increasingly favored by consumers and automakers.However,the balance of the three-cylinder machine is worse than that of the four-cylinder machine.From the structural point of view,the four-cylinder engine is more evenly stressed during operation,and can cancel each other's vibrations caused by unbalanced forces and moments in the movement during operation.The three-cylinder engine can not achieve this balance due to its own structure,so when working Will bring more significant vibration and noise.Using the OPAX method can accurately and quickly study the matching of the three-cylinder suspension system,which can not only reduce the troubleshooting time,but also greatly save the manpower and material resources.It is of great significance to solve the vehicle vibration problem and improve the ride comfort.In view of the current lack of domestic and foreign scholars to apply the OPAX method to the optimization of the three-cylinder suspension system,this paper focuses on the theoretical explanation of the three-cylinder machine and the OPAX method to troubleshoot and optimize the three-cylinder suspension system.In this study,the in-line three-cylinder machine was firstly studied,and the unbalanced force and torque received by the cylinder during its work were theoretically analyzed,compared with the four-cylinder and six-cylinder machines,and several types of three-cylinder machine were analyzed according to their unbalanced characteristics.The balance method(plus balance weight,balance shaft,etc.)is divided into three strategies based on the distribution of engine excitation energy: completely unbalanced,50% balanced,and fully balanced.Through actual vehicle testing,different balancing strategies are analyzed for optimal suspension systems.Influence,test its stability to select a balancing strategy.Based on the selected balance strategy,LMS.TES.LAB software from LMS was used to collect data on operating conditions,transfer functions,etc.for selected models.Improvements were made to the shortcomings of traditional TPA methods.OPAX was selected for data processing analysis and calculation.,Quickly and accurately troubleshoot the three-cylinder suspension system to calculate the maximum contribution of the transmission path.Finally,a certain direction of a certain suspension element is targeted for optimization and the accuracy and reliability of the method are verified through testing,so as to achieve an optimized matching of the entire suspension system.By using the OPAX method to troubleshoot the three-cylinder suspension system,the path of the largest contribution in the suspension system is accurately and quickly calculated.Based on this result,the path is optimally designed and experimentally verified.The results show that based on the OPAX method,the transmission path of the three-cylinder suspension system is analyzed and optimized.The vibration isolation performance of the suspension system is greatly improved.To a certain extent,the riding comfort of the vehicle is greatly improved,and it has certain guiding significance for the matching and optimization of the three-cylinder suspension system.