应用最优经典设计法设计曲轴扭转减振器

Design Torsional Vibration Damper of Engine based on Classical Optimal Approach

发动机曲轴系统的扭转振动是引发发动机振动造成断裂的重要因素,以某30T工程车辆直列四缸发动机曲轴轴系作为研究对象,建立曲轴轴系的ANSYS有限单元模型,基于模型分析轴系的扭转振动的固有振动和强迫振动特性,获得常用转速范围内的主谐次与次主谐次及对应发动机转速,结合最优经典设计方法对曲轴扭转减振器的参数进行设计,基于有限单元模型验证不同工况下减振器的减振效果;结果表明所设计减振器减振效果良好,为同类车辆发动机曲轴系统的扭转振动分析、扭转减振器的设计及分析提供参考。

The torsional vibration of crankshaft is an important factor in the vibration caused by the engine and causing fracture. An inline 4-cylinder engine crankshaft system will be the object to research. Finite element model of crankshaft is built by ANSYS. And analysis torsi onal vibration characteristics of shafting are based on the model,which include natural vibration and forced vibration. It gets main harmonic times,minor main harmonic times and corresponding engine speed in commonly used speed range. Designs parameters of Torsional Vibration Damper（TVD）based on classical optimal approach. And tests the damping effect under different conditions based on the finite element model. The results show that the design meets the requirements of the damper,and has good damping effect. Research methods and conclusions can be applied to actual research. It can be used in similar crankshaft torsional vibration system analysis,design and analysis of torsional damper.