摘要
油底壳的振动作为发动机噪声的主要来源,其振动特性直接影响发动机整体噪声性能。通过对柴油机油底壳计算模态与试验模态比较分析,验证有限元模型正确性,结合形貌优化分析方法,对油底壳进行改进。结果表明:优化后油底壳1阶模态振幅明显降低,且振动区域相对于优化前趋于均匀。油底壳结构优化后频率明显提高,其中1阶频率提高幅度最大,提高幅值达到89 Hz,比例达到32.2%。优化后油底壳刚度有大幅度增加,其中1阶增加比例达到75.6%,9阶以及10阶增加幅度达66.6%与57.7%。
The vibration of the oil pan, which is regarded as the main source of engine noise, directly impacts on engine noise performance. In this paper, the correctness of the finite element model has been verified by comparing the computing modal with experimental modal. The oil pan structure was improved based on the topography optimization. The results show that the first modal vibration amplitude was significantly reduced, and the vibration area is relative equally distributed. The vibration frequency of oil pan was significantly increased after optimizing the structure. The increased amplitude of first modal frequency is the sharpest, which has reached to 89Hz structure, the stiffness of oil pan was increased. The tenth order increase 66.6% and 57.7% respectively. and the ratio reached to 32.2%. After optimizing the first order stiffness increase 75.6%, and the ninth,
出处
《小型内燃机与车辆技术》
2015年第2期74-78,共5页
Small Internal Combustion Engine and Vehicle Technique
关键词
油底壳
形貌优化
振动
模态分析
刚度
Oil pan, Topography optimization, Vibration, Modal analysis, Stiffness
