汽车空气滤清器的模态分析及结构优化  

Modal Analysis and Structure Optimization of the Car Air Filter

作　　者：关英俊[1] 张力锋[1] 李想[1] 张疆平 

机构地区：[1]长春工业大学机电工程学院,吉林长春130012

出　　处：《计算机仿真》2015年第4期124-128,共5页Computer Simulation

摘　　要：汽车空气滤清器的表面板壳非常薄,高速气流从进气系统流过时将激励薄板结构产生振动,进而辐射出强烈的噪声,提高滤清器结构动态刚度是减小辐射噪声的有效途径,但刚度的提高通常伴随着质量的增加,实际中希望以最低的结构质量获得最大的动态刚度。针对上述问题,建立了空气滤清器的有限元模型,对其进行了模态分析。从前4阶模态分析结果找出了滤清器上下壳体的薄弱环节,然后通过调节上下壳体壁厚及合理布置加强肋的方法进行结构优化。经优化得到了一种壳体壁厚为3.5mm,加强肋厚度为2.5mm的结构优化设计方案。分析结果表明,滤清器的基频从157.1Hz提高到188.7Hz,提高了20.1%。模态测试表明,结构1阶固有频率为184.4Hz,有限元分析误差为2.3%,优化后的结构提高了低阶固有频率,降低了辐射噪声。The surface of the automotive air filter shell is very thin, high speed air flow from the air intake system through the sheet structure produces vibration, thus radiates strong noise, improve the dynamic stiffness of filter structure is an effective way to reduce the radiated noise, but the increase of the stiffness often accompanied by the increase of the mass, actually, it is desirable to obtain the maximum dynamic stiffness by the structure of the lowest quality. To solve the problem, the basic theory of modal analysis was described briefly and then finite element model of the air filter was estabhshed. The weak links of air filter shell were found through the first four order modal analysis results, and then by adjusting the upper and lower shell wall thickness and the reasonable arrangement of strengthening rib on structure optimization. The optimized air filter shell wall and rib thickness is defined as 3.5 mm and 2. 5 mm respectively. The analysis results show that the fundamental frequency of the filter increased from 157.1 Hz to 188.7 Hz, increased by 20. 1%. Modal test showed that the first order natural frequency is 184. 4 Hz, the error of finite element analysis is 2. 3 %, and the optimized structure improves the low order natttral frequency and reduces radiated noise.

关 键 词：空气滤清器 固有频率 模型分析 结构优化 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]