铝合金地铁车内低频结构噪声特性预测  

Prediction of interior low-frequency structure noise characteristics of aluminum alloy metro vehicle

作　　者：左言言[1] 耿烽[1,2] 李树栋 

机构地区：[1]江苏大学振动噪声研究所,江苏镇江212013 [2]南京工程学院车辆工程系,江苏南京211167 [3]南京南车浦镇城轨车辆有限责任公司技术部,江苏南京210031

出　　处：《江苏大学学报（自然科学版）》2012年第2期139-143,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省自然科学基金资助项目(BK2009212);高等学校博士学科点专项基金资助项目(20103227110009)

摘　　要：针对轨道不平顺引起地铁车辆车体壁板振动产生的车内低频结构噪声问题,建立了铝合金地铁车辆车体结构有限元模型、车内声场边界元模型和车辆轨道耦合模型,进行了动力学分析,得到轨道随机不平顺激励下,车体所受激励载荷并施加于车体结构的有限元模型,在ANSYS软件中进行了车体结构谐响应分析,得到车体振动响应.将得到的车体振动响应作为边界条件传递给车内声场边界元模型,在SYSNOISE软件中计算了频率0～200 Hz范围内车内不同位置的低频结构噪声分布特性.结果表明:车内最大声压级超过75 dB;车体结构特点以及激励载荷情况直接影响车内结构噪声特性;减少轮轨激励载荷或优化车体结构,均可降低车内结构噪声.To analysis the interior low-frequency structural noise caused by car body panels vibration from track irregularities, the finite element model of aluminum alloy metro vehicle car body and the sound field boundary element model of car interior space were established. The dynamic analysis was performed based on the proposed models of vehicle-track coupled dynamic system. According to the dynamic loads on involved positions of body structure and the finite element harmonic response analysis method in AN- SYS software, the vehicle structure body vibration responses under random irregular rail-track actuations were achieved. The vehicle body structure vibration responses were transfered as boundary conditions to the boundary element model of car interior sound field in SYSNOISE software. The interior sound field characteristics were predicted in the range of 0 - 200 Hz at different inside place of car. The results indi- cate that the maximum inner sound pressure level is more than 75 dB. The interior low-frequency structu- ral noise characteristics in car body of aluminum alloy metro is influenced directly by car body structure characteristics and actuating loads. The interior structural noise can be reduced by decreasing rail-track actuations or optimizing vehicle body structure.

关 键 词：地铁车辆 铝合金 车内噪声 预测 有限元/边界元 

分 类 号：U270.16[机械工程—车辆工程]