Design And Research On Engine Rubber Mount Of Commercial Vehicle

Engine mount system has a crucial impact on the comfort of the vehicle. matching themounting system can effectively attenuate the transfer of engine vibration to the body. Therubber suspension from the powertrain, finite element modeling and analysis to start todiscuss in detail the optimization of powertrain mounting system, calculation andsimulation of the suspension components, and test mounting system test. Detailed studyand made a commercial vehicle powertrain mounting design flow and optimizationmethods.This paper includes five chapters:In chapter1: The relevant literatures at home and abroad are detailed inspected. Thedevelopment of engine mount is summarized. And the development of research andoptimization methods is summarized also. The main content and significance of thepurpose of this study is describedIn chapter2: First, the finite element method is described in detail, including the basicprocess and before and after processing. Brief introduction of nonlinear finite elementsoftware ABAQUS is done too. Nonlinear finite element method of rubber materials,including rubber material is introduced detailed. The method of parameter identification ofrubber material based on material testing is introduced too. According to the parametersidentification, and a finite element model of the rubber mount is established ultimately. Andthe stiffness of the mount is analyzed. In order to verify the accuracy of the simulationresults, the mount stiffness test is done. And the results in static and dynamic stiffnessbetween simulation and experimental are compared. It is indicate that finite element modelof the rubber mounts is correct. The foundation to further optimize the design of themounting system is laid.In chapter3: The method of engine mount system optimization is described. Thepowertrain parameter is identification by test. And mount system optimization is done using penalty function method. Two kinds of improvements program are given at last. Themounts are designed using the finite element method. In order to verify the optimizationresults, modal test of engine mount system is done. The test results show that the twoprograms are well-meet the modal requirements of engine mount system. Test results showthat both the vibration acceleration and the vibration displacement of the key points of thepowertrain are better than the original engine mount system. The test results show thatoptimization of engine mount system has played a good role to make a better isolationeffect than the original engine mount system.The vehicle road tests are done. The test types include idle testing and acceleratedtesting. Test results show that vibration of the frame side of the mount is smaller both inidles testing and accelerated testing. Moreover, during the test we find that there is aresonance on the frame side nearby the frequent of200Hz. So a finite element calculationand optimization are done, and the improvement program is given. And according to theroad test, the resonance is disappeared and the effect of the improvements is certificated.In chapter5, the research contents and conclusions are summarized, and the futureresearch is prospected.