Optimization Of The Power-train Mounting System And Research Of The Rubber Mount Design Method

With the rapidly development of society and the pursuit to higher life quality of people,automobiles are becoming very popular as the means of transport in our daily life. Theautomobile Ride comfort is a very remarkable performance, particularly for the car. Weshould not ignore the vibration which is transmitted from the power-train to the vehicle,because the vibration is the main source which can affect the car ride comfort. So thevibration isolation ability of the power-train mounting system will directly affect the ridecomfort of the vehicle.Nowadays, how to find some effective methods and measures which can help us designa power-train mounting system with good vibration isolation and reduction ability is a keyprocess of automobile research and development design. In addition, the engine mount is akey part of the power-train mounting system; the vibration isolation characteristics of itwould directly affect the isolation ability of the system. So if we want to improve thevibration isolation ability of the power-train mounting system and reduce the vibration of thevehicle, we must take some measures to reasonably optimize the power-train mountingsystem, and design more scientific structure of the mounts which stiffness meet the designrequirements. In this paper, the specific research contents include the following aspects:First of all, establish the mechanical model and mathematical model of the power-trainmounting system, and analyze the vibration characteristics and natural characteristics of thesystem. On this basis, we have developed power-train mounting system optimizationsoftware by using C plus plus language. The above research work provided a theory and atool of optimizing the performance of vibration isolation for the power-train mountingsystem.Secondly, this paper identified the six natural frequencies of a power-train mounting system by three different ways. The first method is to use the optimization software whichwe have developed in this paper to calculate the six natural frequencies; The second methodis to use the simulation model of the power-train mounting system which we have establishby using dynamic analysis software to simulate the natural frequencies of the system; Thethird method is to build a test platform which can help us acquire the natural frequencies ofthe power-train mounting system by testing. Through the three kinds of rigid-body modalidentification method above, we can verify the validity and reliability. Through the threekinds of rigid-body modal identification method above can verify the validity and reliabilityof the power-train mounting system optimization software in this paper.Then, we have optimized the linear section stiffness of the rubber mount by using thepower-train mounting system optimization software in this paper, and designed the wholestiffness curve of the rubber mount according to the related principle.At last, take some engineering and technical measures to realize the ideal stiffnesscharacteristics which the mounts should be possessed, and design the structure of the rubbermounts. Then, analyze the whole stiffness curve of the rubber mounts which have beendesigned by using finite element analysis technology, and compared with ideal curve, inorder to verify the validity and reliability of the designed rubber mounts structure design.As is known to all， different cars have different vibration isolation and reductionsystem, so the power-train mounting system have different requirements on the vibrationisolation characteristics of different car. The study of this paper can produce theo retical basisand research method on the design and development of rubber mount and the optimization ofthe power-train mounting system.