基于多目标形貌优化方法的低噪声油底壳研究  

Low Noise Design of Oil Pan Based on Multi-objective Topography Optimization

作　　者：张俊红[1] 王健[1] 刘海[1] 何文运[1] 李林洁[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《振动．测试与诊断》2014年第3期467-472,589,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家高技术研究发展计划("八六三"计划)资助项目(2012AA1117064)

摘　　要：为了有效降低油底壳的辐射噪声,在设计阶段对初始油底壳的振动噪声水平进行了预测和评估,据此提出了以下结构优化方案:结合模态试验技术建立准确的初始油底壳辐射噪声预测数值模型,根据噪声预测结果,识别出对油底壳整体辐射噪声贡献度较大的峰值频率;结合油底壳自身固有频率,以降低油底壳整体辐射噪声为总目标,以降低预测噪声频谱中各主要峰值频率成分为子目标,建立多目标优化函数,进行油底壳结构形貌优化设计。结果表明,优化前整体噪声声压级为100.23dB,在合理布置板材冲压加强筋后,整体噪声降低了2.79dB。此优化方案减少了单目标形貌优化"设计-试验-改进设计"的重复性和主观性,降低了产品设计的成本,缩短了产品开发周期。The oil pan is one of the main diesel engine components that makes radiated noise.The key to reducing overall engine noise is controlling and reducing the radiated noise level of the oil pan in the design stage.In order to effectively do so,the vibration and radiated noise of the original oil pan is estimated and predicted,and the following structure optimization approach is proposed accordingly.Firstly,the noise prediction model of the original oil pan is built up.Secondly,the main peak frequencies are found according to the prediction results and used in combination with the oil pan natural frequency.The overall objective is to reduce the overall radiated noise of the oil pan,and the sub goal is to reduce the main peak of the noise spectrum.Lastly,a multi-objective optimization function is built in order to begin structure topography optimization.The results show that overall noise is reduced 2.79 dB compared to the original overall sound pressure level of 100.23 dB,through appropriate arrangement of the stamping ribs.This optimization scheme can decrease the repetition and subjectivity of the process design-test-improved design′,reducing the design cost and shortening the design cycle.

关 键 词：油底壳 多目标形貌优化 结构优化 噪声预测 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程] TH82[机械工程—仪器科学与技术]