汽油机曲轴系统扭振特性仿真与实验研究
Simulation and Experiment Study of Torsional Vibration for a Gasoline Engine Crankshaft System

为了研究汽油机曲轴系统扭振特性,以某新型1.8L汽油机为研究对象,首先应用多体动力学软件AVL-EXCITE Designer建立曲轴系统模型,利用三维制图软件得出系统的参数,分析曲轴系统的自由振动与强迫振动;应用CATIA软件和Spectra LAB软件得出减振器的转动惯量及固有频率,从而分析加装减振器后轴系的扭振特性。利用LMS Test.lab噪声振动测量系统进行扭振测试,并对试验测试结果与仿真结果进行对比分析,两者吻合得较好,证明本文提供的仿真方法能有效预测实际发动机轴系扭振情况。
This paper studies the torsional vibration of a gasoline engine crankshaft, based on a 1.8L gasoline engine as the research object. Firstly, the multi-body dynamics software AVL-EXCITE Designer is used to establish crankshaft model, the 3 dimensional mapping software CATIA is used to determine the parameters of the system; with the Spectra LAB, the free vibration and forced vibration of shaft are analyzed to get the natural frequency and inertial parameter of the damper, and the characteristics of crankshaft torsional vibration after the installation of the damper are also analyzed. Then, the software LMS Test.Lab is used to test the torsional vibration, and the test results and simulation results are analyzed. The test results coincide with calculation well and demonstrate the preferable prediction of torsional vibration for an actual gasoline engine crankshaft