Multi-body Dynamics Research On Norsional Vibration Of Vehicle Driveline

With the structural lighter of the vehicle and the comfortable higher required, the torsional vibration on the power driveline of the vehicle is becoming more important and is primary factor of the construct vibration and sound of the vehicle. With the people's requirement for more comfortable ride, vibration decreasing and noise absorption have been played an important role in automobile Industry. With the support of Chongqing science technology & commission (project number:CSTC, 2005AC6035), torsional vibration characteristic of mini-vehicle has been investigated, and the research has some academic and practical value.At long time, designers only consider the construct intensity when designing the power driveline of vehicle. There are no efficient control measures for reducing torsional vibration of vehicle to them. Generally, designers make simple dynamic model or depend on experiential design to get parameters by more tests and repeated amendment. These methods not only use a great deal of manpower and material resources, but also spend much time, and the control effect maybe is not satisfied at last. With rapid development of the computer technology, the technologies of numeric simulation are widely applied to the product design. At same time, some new research methods and theories are applied to solve the problems of the torsional vibration control.This paper used multi-body system simulation (MSS) method, combined with finite element analysis (FEA), the torsional vibration of automotive driveline is analyzed in this paper. This paper involves some aspects: the components of mini-vehicle driveline VP modeling, the natural frequency analysis of shaft system, the torsional vibration dynamic characteristic simulation of driveline and structure amend of driveline. They are listed as follow.①The important parts of mini-vehicle driveline are modeled and assembled by using UG software firstly. Then, the 3D model is imported to ADAMS software, and multi-rigid model of driveline is generated when some constraints are created on correlative parts.②The modal analysis of driveline system's shafts has been doing by MSC-NASTRAN software, and torsional vibration dynamic characteristic is gained. At the same time, the modal neutral files (.mnf) are created. ③The parts of rigid body model are replaced by corresponding flexibility body. The torsional vibration model of driveline, which includes flywheel of engine, clutch, transmission, universal joint, drive shaft, main reducing gear-differential mechanism, half axle and road wheel, is established.④Exciter of vehicle driveline has been researched and torsional forced vibration analysis has been done.⑤Amendment of driveline structural parameters has been researched and improvements are given.