四缸柴油机油底壳噪声预测与降噪研究
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摘要
作为发动机上的壳体零件,油底壳的振动噪声控制是一个急需解决的问题。以某四缸柴油机油底壳为研究对象,采用有限元(FEM)与边界元(BEM)相结合的方法进行仿真分析,对油底壳的振动响应以及噪声辐射进行预测。通过增加厚度、更改材料以及将大而平的面改为波浪形的方法,提出结构改进的方案。结果表明,上述方法都能够有效地降低辐射噪声,更换材料以及加厚的方法均能降低噪声3.7 d B(A)以上,其中更改材料的方法单位质量降噪效果最好。
As the shell part on the engine, the vibration and noise control of the oil pan is an urgent problem to be solved. Taking an oil pan of a four-cylinder diesel engine as the research object, the finite element method(FEM) and the boundary element method(BEM) were used to simulate and analyze the vibration response and noise radiation. By increasing the thickness, replacing materials and changing large and flat surfaces into wavy ones, a scheme for structural improvement was proposed. The results show that the methods above can effectively reduce the radiation noise. Methods of replacing the materials and thickening can both reduce the radiation noise by over 3.7 d B(A), and replacing the materials shows the best performance of noise reduction per unit mass.
As the shell part on the engine, the vibration and noise control of the oil pan is an urgent problem to be solved. Taking an oil pan of a four-cylinder diesel engine as the research object, the finite element method(FEM) and the boundary element method(BEM) were used to simulate and analyze the vibration response and noise radiation. By increasing the thickness, replacing materials and changing large and flat surfaces into wavy ones, a scheme for structural improvement was proposed. The results show that the methods above can effectively reduce the radiation noise. Methods of replacing the materials and thickening can both reduce the radiation noise by over 3.7 d B(A), and replacing the materials shows the best performance of noise reduction per unit mass.
引文
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[2]张宗成,杨景玲,张燕,等.发动机油底壳的噪声分析及结构优化[J].噪声与振动控制,2013,33(6):115-119.
[3]YE MIAO ZHAO,XIAO HUI CAO,CHEN HAI GUO,et al.Study on FEM[J].Advanced Materials Research,2013,2586(774).
[4]TOMMY LUFT.Noise reduction potential of an engine oil pan[A].Society of Automotive Engineers of China、International Federation of Automotive Engineering Societies.Proceedings of the FISITA 2012 World Automotive Congress--Volume 13:Noise,Vibration and Harshness(NVH)[C].Society of Automotive Engineers of China,International Federation of Automotive Engineering Societies,2012:14.
[5]张庆辉,郝志勇,张焕宇,等.柴油机缸盖罩隔声性能与透射噪声[J].天津大学学报(自然科学与工程技术版),2014(9):796-802.
[6]刘猛,祖炳锋,徐玉梁,等.基于Pro/E及ANSYS Workbench的柴油机油底壳设计[J].机械设计,2014,(08):52-56.
[7]赵业淼,曹晓辉,郭晨海,等.4DW93柴油机表面辐射噪声仿真研究[J].中国农机化学报,2016(4):156-160.
[8]熊飞.发动机薄壁件主要噪声贡献模态的研究与应用[D].杭州:浙江大学,2016.
[9]杨齐.发动机噪声辐射仿真研究[D].重庆:重庆大学,2015.
[10]吴学锋,张保成,刘宇航,等.基于LMS Virtual.Lab的油底壳辐射噪声预测分析[J].现代车用动力,2013(3):8-43.
[11]KAZUHIDE OHTA,KOICHIRO IKEDA,TAKAYA FUTAE.Study on the noise and vibration of engine block coupled with the rotating crankshaft and gear train(Effect of the torsional vibration of crankshaft)[J].Mechanical Engineering Journal,2014,1(5).
[12]张俊红,王健,刘海,等.基于多目标形貌优化方法的低噪声油底壳研究[J].振动.测试与诊断,2014(3):467-472+589.
[13]张磊,任海军,艾晓玉,等.发动机薄壁件结构振动优化[J].振动工程学报,2010(6):687-697.