| 《通过顶棚模态试验分析优化车内噪声》 |
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| 引用本文： | 邵德刚,周鋐,郭荣. 《通过顶棚模态试验分析优化车内噪声》[J]. 噪声与振动控制, 2009, 29(6): 165-169. DOI: 10.3969/j.issn.1006-1355.2009.06.165 |
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| 作者姓名： | 邵德刚 周鋐 郭荣 |
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| 作者单位： | （同济大学汽车学院，上海201804） |
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| 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。
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| 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 |
| 收稿时间： | 2009-03-20 |
Optimization of Interior Noise by Experimental Modal Analysis |
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| SHAO De-gang,ZHOU Hong,GUO Rong. Optimization of Interior Noise by Experimental Modal Analysis[J]. Noise and Vibration Control, 2009, 29(6): 165-169. DOI: 10.3969/j.issn.1006-1355.2009.06.165 |
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| Authors: | SHAO De-gang ZHOU Hong GUO Rong |
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| Affiliation: | (School of Automotive Studies, Tongji University, Shanghai20184, China) |
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| Abstract: | 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. |
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| Keywords: | vibration and wave experimental modal analysis vehicle roof structure optimization noise control |
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