A fixed Precision Method of Acoustic Radiation Prediction Based Hybrid FE-SEA in Medium-frequency Region
-
摘要: 阐述了FE-SEA混合方法基本理论,建立了圆柱结构FE-SEA混合方法模型,利用FEM-BEM方法对模型中的耦合损耗因子给予修正。在白噪声激励条件下,预测了复杂圆柱结构辐射声场。在模拟声激励及力激励条件下完成了飞机舱段内声场的实验测量,同时使用仿真模型进行腔内噪声预测,并与实验结果进行对比。结果表明:使用FEM-BEM方法修正耦合损耗因子,可以提高预测精度,使预测结果在中频范围内的绝对误差小于5 dB。Abstract: The basic theory of hybrid FE-SEA method was reviewed and the FE-SEA model of the complex cylindri-cal structure was built in this study. The coupling loss factor of the model was modified by utilizing the FEM-BEM method. Moreover, the sound radiation characteristics of such structures under the white noise excitation were pre-dicted. The sound pressure level in the sound cavity of complex cylindrical structure was measured in the anechoic room under the acoustic excitation. Meanwhile, the model was simulated and the results show well agreement with the experimental data. This method, which modifies the coupling loss factor using FEM-BEM, improves the predic-tion precision and reduces the absolute error to less than 5 dB within intermediate frequency region.
-
Key words:
- complex cylindrical structure /
- hybrid FE-SEA method /
- sound prediction
-
[1] 姚德源,王其政.统计能量分析原理及其应用[M].北京:北京理工大学出版社,1995 [2] 王毅刚.飞机典型舱室结构传声的统计能量分析[D].上海:同济大学,2005 [3] Langley R S.A general derivation of the statistical energy analy-sis equations for coupled dynamic systems[J].Journal ofSound and Vibration,1989,135(3):499～508 [4] Langley R S,Bremner P.A hybrid method for the vibration anal-ysis of complex structural-acoustic systems[J].Journal of theAcoustical Society of America,1999,105:1657～1671 [5] Langley R S.Mid and high-frequency vibration analysis of struc-tures with uncertain properties[A].Proceedings of the 11thInternational Congress on Sound and Vibration[C],St.Pe-tersburg,Russia,2004 [6] 陈书明,王登峰.车内噪声FE-SEA混合建模及分析方法[J].振动工程学报,2010,23(4):140～144 [7] 李冰,陈克安.FE-SEA混合法在复杂圆柱结构声辐射预测中的应用[J].声学技术,2010,29(6):1～4 [8] 胡莹.基于混合模型的复杂结构振动响应分析[D].西安:西北工业大学,2007 [9] 孙进才.复杂结构的损耗因子和耦合损耗因子的测量方法[J].声学学报,1995,20(2):127～134 [10] Langley R S.On the modal density and energy flow characteris-tics of periodic structures[J].Journal of Sound and Vibra-tion,1994,172(4):491～511 -
点击查看大图
计量
- 文章访问数: 160
- HTML全文浏览量: 23
- PDF下载量: 2
- 被引次数: 0
下载:
