Simulation Analysis And Optimization Design Of A Three-cylinder Engine Mount System

With the continuous tightening of national emission regulations,the three-cylinder engine will undoubtedly become the main product in this transitional stage.Faced with the inherent jitter problem of the three-cylinder engine,on the one hand,starting from the three-cylinder engine itself,some balancing measures can be used to offset the unbalanced torque generated by itself;on the other hand,from the perspective of vibration isolation,a better suspension system can be designed To isolate the transmission of engine vibration to the body.In this paper,a three-cylinder engine mounting system is taken as the research object.Based on the research of the vibration isolation principle of the powertrain mounting system,it is optimized and simulated using ADAMS software.The main research work of this article is summarized as follows:1.From the suspension element to the suspension system,the basic theory of the suspension system design is comprehensively introduced.The detailed theoretical analysis of the vibration characteristics of the three-cylinder engine is given,and the goal of the optimal design of the suspension system is given.2.Introduces the measurement process of the relevant parameters of the suspension system simulation analysis in detail.Using this parameter as input,the six-degree-of-freedom and thirteen-degree-of-freedom simulation models of the powertrain mounting system were established in ADAMS.The differences in the simulation effects of the two models and the causes of the differences were compared and analyzed.In addition,MATLAB was used to write code to calculate the modal and decoupling rate of the mounting system,which verified the correctness of the simulation model.3.Based on the situation of modal energy coupling in the existing mounting system,the decoupling rate is the optimization goal,and the frequency of each modal is the constraint variable.Using Adams Insight to analyze the sensitivity of each impact factor,through the adjustment of the main impact factors,the low-order modal frequency and energy decoupling rate of the powertrain mounting system were improved to meet the design goals and the Optimization of the home system.4.The nonlinear stiffness curve design of the suspension,based on the General Motorssuspension system working condition calculation table,in the ADAMS,the optimized suspension system was calculated for 28 working conditions.The calculation results show that the design of the stiffness curve Meets the displacement control goal of the powertrain.