三缸发动机一阶往复惯性力矩平衡率对曲轴扭振与表面振动的影响研究

Influence of First Order Reciprocating Inertia Moment Balance Ratio on Torsional Vibration and Surface Vibration of Crankshaft for Three-cylinder Engine

为了研究三缸汽油机采用单平衡轴时一阶往复惯性力矩平衡率对曲轴扭振和发动机表面振动的影响,采用多体动力学软件AVL-EXCITE-Power Unit建立发动机多体动力学模型。开展30%~100%一阶往复惯性力矩平衡率下曲轴扭振和发动机表面振动仿真研究。结果表明:采用单轴平衡法通过选择合适的平衡率会降低发动机的表面振动,但同时也会在某种程度上增大曲轴的扭振。因此,在采用单平衡轴进行三缸机减振时也要考虑其对扭振的影响。

In order to investigate the influence of different first-order reciprocating inertia moment balance ratio on crankshaft torsional vibration and engine surface vibration when three-cylinder gasoline engine adopts single balance shaft,the AVL-EXCITEPower Unit,which is a kind of multi-body dynamics software is used to establish the engine dynamics model.The torsional vibration of crankshaft and the surface vibration of engine under the balance ratio of 30%to 100%reciprocating moment of inertia are simulated.The results show that the surface vibration of the engine can be reduced by using the method of single balance shaft,but the torsional vibration of the crankshaft can also be increased to some extent.Therefore,the influence of single balance shaft on torsional vibration should also be considered when the vibration reduction of three-cylinder machine is carried out.