船用增压器系统模态分析及优化

为提升船用增压器系统的可靠性,以零部件的固有模态属性为基础,利用Abaqus软件对现有某6缸中速柴油机的增压器及相关零部件模型进行仿真模态分析,并通过试验对仿真结果进行校验。结果表明:基于仿真的模态分析满足精度要求,增压器系统一阶模态频率为67.36 Hz,低于设计要求的90 Hz,且转速为1150~1300 r/min时,共振倾向明显。根据仿真模态分析结果提出相应的优化解决方案,通过优化增压器支架结构形式,增加整个增压器及相关零部件的支撑刚度。试验结果表明:增压器系统的一阶模态频率提高到90.8 Hz,避免增压器系统在发动机运行区间内发生共振,提升了柴油机整机的运行可靠性,优化方案满足设计要求。

Modal Analysis and Optimization for Marine Turbocharging System

In order to improve the reliability of marine diesel turbocharging system, the simulation modal analysis of the existing supercharger and related parts model of a 6-cylinder medium speed diesel by Abaqus. The results of the simulation were validated by experiments. The simulation based modal analysis meets the accuracy requirements. The original first-order modal frequency of the turbocharger is 65.9 Hz, which is lower than the required 90 Hz. Meanwhile, resonance could be observed when speed is from 1150 to 1300 r/min. The optimization program for the supporting structure of turbocharger was put forward to increase the system stiffness. Experimental results of the refined system show that the first-order modal frequency has been increased to 90.8 Hz. Thus resonance could be avoided in the operating range of the diesel, which effectively improves the reliability of the diesel engine.