摘要
介绍顶棚在实车状况下的试验模态分析方法,采用悬挂激振器而车辆接地的单向激振方式,讨论激振点的选取位置,利用PolyMax方法求得顶棚前十阶模态频率及振型,并通过各测点相干性、频响函数曲线和各阶模态MAC值的检验保证模态试验结果的可靠性;找出对车内轰鸣噪声影响显著的敏感频率和薄弱位置,以此为依据优化其结构刚度,实现模态的移频。优化后的顶棚频响函数幅值取得明显改善,降低在敏感转速时的车内轰鸣噪声声压级。
This paper introduces the method of modal test and analysis for vehicle roof. A single hung shaker was used to excite the roof while the car is grounded. According checking the measuring points＇ coherence, FRF value and modes＇ MAC value, the result of the modal test was verified. Natural frequencies and vibration mode of the first 10 orders were obtained by PolyMax method and impressible frequency to inner noise and weak position of the roof were found. Through the improvement of roof structure, the impressible frequency was evaded, the FRF value of the roof was improved obviously and the interior noise in critical rotation speed was reduced.
出处
《噪声与振动控制》
CSCD
北大核心
2009年第6期165-169,共5页
Noise and Vibration Control
关键词
振动与波
试验模态分析
车身顶棚
结构优化
噪声控制
vibration and wave
experimental modal analysis
vehicle roof
structure optimization
noise control
