APP下载

某船用发动机中冷器螺栓断裂故障分析及优化

2021-09-10李艳君

内燃机与配件 2021年3期

摘要:本文利用Hypermesh对某船用发动机中冷器系统进行前期的网格处理,用Abaqus结构仿真软件对处理好的发动机中冷系统进行模态及强度计算分析。文中先对产生故障的某船用发动机系统进行故障分析,找出故障原因,再根据故障分析结果对该系统的结构进行了优化。最终通过给该系统增加辅助支撑的方式,提高了中冷器系统频率,使其高于特殊零部件的校核标准,取得了较好的效果,从而有效解决了因发动机共振引起的故障。

关键词:中冷器系统;模态分析;静强度分析;面压;滑移量

Abstract: In this paper, a Marine engine intercooler system was processed with the Hypermesh in the early stage, and the model and strength of the processed engine intercooler system were calculated and analyzed with the Abaqus structure simulation software.In this paper, the fault analysis of a Marine engine system is carried out to find out the cause of the fault, and then the structure of the system is optimized according to the results of the fault analysis.Finally, by adding auxiliary support to the system, the frequency of the intercooler system is increased, making it higher than the checking standard of special parts, and good results are obtained, thus effectively solving the fault caused by engine resonance.

Key words: inter-cooled systems;thermal modal analysis;static strength analysis;surface pressure;slip

0  引言

中冷器系统是发动机上非常重要的系统,它的主要功能是将经过增压器压缩的空气的温度降低再提供给发动机进气系统,以降低发动机温度,从而提升功率和降低油耗。因此,中冷系统的工作可靠性是发动机燃油经济性的一项重要影响因素。本文主要利用Abaqus[1]结构仿真软件对某发动机中冷器系统进行模态和静强度分析,为解决故障提供优化方向和改进验证,提高了中冷器系统的可靠性,缩短了产品的开发周期。

1  故障问题

我公司配套的某型号船用发动机,出现中冷器螺栓断裂的问题。最初为中冷器支架螺栓断裂,更换较高强度的螺栓后,中冷器本身的螺栓断裂,故障图片如图1和图2所示。经分析为中冷器本身质量较重,整个系统模态较低,与发动机本身的振动频率产生共振的原因造成的故障。

通过对该中冷器系统进行模态及强度分析,增加辅助支撑,以提高整个系统的频率,使其避开发动机的常用转速对应的点火激励频率。……

登录APP查看全文