600kW12V发动机曲轴轴系振动固有特性仿真分析

The natural characteristic simulation analysis of crankshaft system vibration for 600kW12V engine

利用Hyper Mesh前后处理软件,建立600k W12V发动机曲轴轴系的有限元仿真模型并施加相应的约束,再通过MSC/Nastran解算软件对其进行振动固有特性分析,得出曲轴轴系的前9阶固有频率和振型。根据发动机曲轴轴系前两阶固有频率,计算出其在工作转速内的临界转速,为该发动机的进一步动态优化设计提供依据。实际运行中,避免发动机在这些临界转速下的长期工作将有助于提高发动机运行的平稳性,有效降低发动机的动负荷与噪声。

A FEA simulation model of 600kW12V engine crankshaft system was established by use of the pre-processing and postprocessing software HyperMesh, and its corresponding constraints were properly applied. Then the natural vibration characteristics were analyzed by simulation tool MSC/Nastran. The first nine natural frequencies and mode shapes of vibration were obtained. According to the first two natural frequencies, the critical speeds within the operating speed range were calculated, which provides a basis for further dynamic optimal design of the engine. During the actual running process, avoiding long-term operation under these speeds helps the engine run smoothly and reduce dynamic load and noise.