摘要
首先使用LMS数据采集系统在试验场对某品牌SUV进行NVH摸底测试,通过阶次分析技术确定了发动机二阶振动引起传动轴的扭振,进而引发整车2 000r/min转速下的轰鸣声及异常振动。然后分析了动力吸振器的工作原理,设计工作频率为67Hz的动力吸振器,并利用有限元方法分析得出动力吸振器工作频率为67.4Hz。最后进行优化验证测试,优化后前、后排的总声压级均降低7d B以上,语言清晰度提升57%。试验证明,该方法能有效改善2 000r/min下整车的振动噪声水平。
Firstly the diagnostic tests are carried in a SUV on a long straight line on testing ground by LMS testing system. Shaft torsional vibration is caused by the second-order vibration of engine,which is determined by order analysis technique. And then,shaft torsional vibration triggers a roar and abnormal vibration in 2 000 r / min speed.Secondly the theory of tuned mass damper( TMD) is discussed. Then TMD which works at 67 Hz is designed and the product works at 67. 4Hz by FEM method. Finally the verification testing is carried and the result shows SPL of interior car decreases 7d B,while AI increases more than 57%. Which this method can effectively improve the noise and vibration levels under 2 000 r / min vehicle.
出处
《机电一体化》
2015年第6期36-40,共5页
Mechatronics
关键词
LMS
阶次分析
NVH
动力吸振器
扭振
LMS order analysis NVH tuned mass damper(TMD) torsional vibration
