基于模块化设计降低柴油机振动的开发与研究

为了提升某柴油机的整机振动性能,文中基于模块化设计的方法对柴油机飞轮壳结构进行优化设计,将组合式结构改为一体式结构,并对优化前后的两种结构进行了有限元分析和多体动力学分析。在有限元分析中,通过对比计算和试验的自由模态验证有限元模型的准确性。在多体动力学分析中,通过对比计算和试验的表面振动加速度验证多体动力学模型的准确性。结果证明,模块化设计的方法有效降低了整机振动,飞轮壳顶部测点的振动加速度降低了53.3%,整机振动烈度降低了14.0%。

Development and research of reducing the diesel engine's vibration via modular design

In order to improve the diesel engine’s vibration performance,the flywheel cover is optimized through the approach of modular design-from the combined structure to the integrate structure.Both the finite element analysis and the multibody dynamics analysis are conducted on the structures prior to and after the optimization.In the finite element analysis,the free modalities of calculation and test are compared to check whether the specific model is accurate or not.In the multi-body dynamics analysis,the surface vibration accelerations of calculation and test are compared to check whether the specific model is accurate or not.The result indicates that the modular design effectively reduces the diesel engine’s vibration.The vibration acceleration of the measured point on top of the flywheel cover reduces by 53.3%,and the whole machine’s vibration intensity decreases by 14.0%.