Analysis and Optimization of Engine Dynamic Response under Piston Slap
Suppression of knocking noise generated by secondary piston motion is an important aspect of engine NVH control.Taking a two-cylinder four-stroke engine as the research object,considering the working deformation and contact characteristics of piston and cylinder liner,the rigid-flexible coupling dynamics model of the whole engine was established to explore the vibration and noise response under piston percussion excitation.Multi-objective optimization design was con-ducted with piston kinetic energy and friction loss as optimization objectives,piston clearance,piston pin offset,and the posi-tion of the mass center as design variables.The results show that the piston percussion excitation mainly affected the upper part of the engine body,and the vibration and noise of the cylinder head cover were obvious.After the optimization,the pis-ton percussion kinetic energy,friction loss,vibration and noise of the engine body were improved,and the piston percussion kinetic energy at 6000 revolutions per minute was 31.1％lower than that before the optimization.The maximum reduction of radiation noise at the top of cylinder head cover was 4.8％.
vibration and wavesecondary motionkinetic energyfrictional lossradiation noisemulti-objective optimization
万方数据
维普
