机构地区: 长安大学工程机械学院道路施工技术与装备教育部重点实验室
出 处: 《郑州大学学报(工学版)》 2011年第4期30-33,共4页
摘 要: 汽车排气系统对车内噪声有重要影响,针对车内噪声控制问题,采用试验和仿真相结合的方法,对实车进行了多工况测试,对排气系统进行了模态仿真分析.实车测试结果表明,通过排气系统悬挂点传播的振动噪声是引起车内噪声的重要因素,排气系统模态仿真结果表明,原悬挂点偏离模态节点需进行优化.对悬挂点优化后的排气系统进行了验证试验,结果表明:排气系统悬挂点优化后,车内噪声有明显降低,平均降噪2.5 dB(A),后排降噪量达5 dB(A),研究成果可以指导工程应用. Exhaust system is one of factors that affect vehicle interior noise.In order to reduce the noise level,tests were carried on the prototype and exhaust modes were simulated.The results show that exhaust hanger is major factor on vehicle interior noise.The exhaust hanger,mounting locations,should be optimized according to the system analysis on the vibration nodes.After the optimization of exhaust hanger,the vehicle interior noise level has been cut down with 2.5 dB(A) average and 5 dB(A) in rear seats.