改进的非负声强和有用声强识别表面声辐射
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摘要
识别结构表面对远场声辐射有实质贡献的区域,对控制远场声辐射有重要意义。该文以非负声强法为基础得到改进的声强计算方法,这种方法比非负声强法计算量小,能更好地识别出表面对远场有贡献的区域。该文对有用声强法从特征值和截断准则的角度进行了一些改进。最后,以四边简支薄板为例,分别采用这三种方法计算几种不同频率下的噪声辐射区域。数值计算结果表明,采用该文提出的方法可以较好地识别出结构表面对远场声辐射有实质贡献的区域,而且计算量相对较小。
Identification of radiating regions on arbitrarily shaped surface is important to control the farfield acoustic radiation. In the paper, an improved method is obtained, which is based on the non-negative intensity. This method reduces the amount of computation compared to the non-negative intensity and it is better than the non-negative intensity for identification of radiating regions on arbitrarily shaped surface.And some improvements are made on the useful intensity from the two points of eigenvalue and truncation criterion. In the end, examples of the application of the three methods are presented and the numerical results are discussed. The numerical results show that the proposed methods are very effective, which has application value.
Identification of radiating regions on arbitrarily shaped surface is important to control the farfield acoustic radiation. In the paper, an improved method is obtained, which is based on the non-negative intensity. This method reduces the amount of computation compared to the non-negative intensity and it is better than the non-negative intensity for identification of radiating regions on arbitrarily shaped surface.And some improvements are made on the useful intensity from the two points of eigenvalue and truncation criterion. In the end, examples of the application of the three methods are presented and the numerical results are discussed. The numerical results show that the proposed methods are very effective, which has application value.
引文
[1]Bruneau M,Scelo T.Fundamentals of acoustics[M].London:John Wiley,2006.
[2]Williams E G.Supersonic acoustic intensity[J].Journal of the Acoustical Society of America,1995,97(1):121–127.
[3]Junior C A C,Tenenbaum R A.Useful intensity:a technique to identify radiating regions on arbitrarily shaped surfaces[J].Journal of Sound&Vibration,2013,332(6):1567–1584.
[4]Marburg S,L?sche E,Peters H,et al.Surface contributions to radiated sound power[J].Journal of the Acoustical Society of America,2013,133(6):3700–3705.
[5]Liu D,Peters H,Marburg S,et al.Surface contributions to scattered sound power using non-negative intensity[J].Journal of the Acoustical Society of America,2016,140(2):1206.
[6]黎胜,赵德有.结构声辐射的振动模态分析和声辐射模态分析研究[J].声学学报,2004,29(3):200–208.Li Sheng,Zhao Deyou.Research on modal analysis of structural acoustic radiation using structural vibration modes and acoustic radiation modes[J].Acta Acustica,2004,29(3):200–208.
[7]黎胜,赵德有.平面声波由空气经加肋板向水中传输的数值计算研究[J].声学学报,2002,27(2):112–116.Li Sheng,Zhao Deyou.Modal analysis of structural acoustic radiation using FEM/BEM[J].Acta Acustica,2002,27(2):112–116.
[8]张小飞,陈华伟,仇小锋,等.阵列信号处理及MATLAB实现[M].北京:电子工业出版社,2015.
[9]Williams E G,Mann III J A.Fourier acoustics:sound radiation and nearfield acoustical holography[J].Journal of the Acoustical Society of America,2000,108(4):1373.
[10]黄玉盈.结构振动分析基础[M].武汉:华中工学院出版社,1988.
[2]Williams E G.Supersonic acoustic intensity[J].Journal of the Acoustical Society of America,1995,97(1):121–127.
[3]Junior C A C,Tenenbaum R A.Useful intensity:a technique to identify radiating regions on arbitrarily shaped surfaces[J].Journal of Sound&Vibration,2013,332(6):1567–1584.
[4]Marburg S,L?sche E,Peters H,et al.Surface contributions to radiated sound power[J].Journal of the Acoustical Society of America,2013,133(6):3700–3705.
[5]Liu D,Peters H,Marburg S,et al.Surface contributions to scattered sound power using non-negative intensity[J].Journal of the Acoustical Society of America,2016,140(2):1206.
[6]黎胜,赵德有.结构声辐射的振动模态分析和声辐射模态分析研究[J].声学学报,2004,29(3):200–208.Li Sheng,Zhao Deyou.Research on modal analysis of structural acoustic radiation using structural vibration modes and acoustic radiation modes[J].Acta Acustica,2004,29(3):200–208.
[7]黎胜,赵德有.平面声波由空气经加肋板向水中传输的数值计算研究[J].声学学报,2002,27(2):112–116.Li Sheng,Zhao Deyou.Modal analysis of structural acoustic radiation using FEM/BEM[J].Acta Acustica,2002,27(2):112–116.
[8]张小飞,陈华伟,仇小锋,等.阵列信号处理及MATLAB实现[M].北京:电子工业出版社,2015.
[9]Williams E G,Mann III J A.Fourier acoustics:sound radiation and nearfield acoustical holography[J].Journal of the Acoustical Society of America,2000,108(4):1373.
[10]黄玉盈.结构振动分析基础[M].武汉:华中工学院出版社,1988.