基于声辐射模态理论的某复杂口盖降噪研究
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- 英文论文题名：Noise reduction analysis of a complex cap based on the theory of acoustic radiation modes
- 论文作者：胡陈映 ; 谭申刚 ; 高飞 ; 顾金桃
- 英文论文作者：HU Chen-ying ; TAN Shen-gang ; GAO Fei ; GU Jin-tao ; AVIC The First Aircraft Institute
- 年：2016
- 作者机构：中航工业第一飞机设计研究院;
- 论文关键词：声辐射模态 ; 振动模态 ; 声辐射功率 ; 降噪
- 英文论文关键词：acoustic radiation modes ; vibration modes ; radiation power ; noise-reduction
- 会议召开时间：2016-11-04
- 会议录名称：2016年度全国气动声学学术会议论文摘要集
- 语种：中文
- 分类号：O422.6
- 学会代码：LTLX
- 会议名称：2016年度全国气动声学学术会议
- 会议地点：中国北京
- 主办单位：中国航空学会航空声学专业委员会、中国航空学会气动声学专业委员会、中国商飞上海飞机设计研究院、北京航空航天大学
- 学会名称：北京航空航天大学流体力学教育部重点实验室
- 页数：5
- 文件大小：680k
- 原文格式：D
- 会议级别：全国
摘要
基于频率响应计算结果,提取了某复杂口盖结构表面法向振动速度,利用声辐射模态理论计算了结构的声辐射功率,与LMS Virtual.Lab声辐射功率计算结果的一致性表明,声辐射模态理论可用于计算复杂结构的声辐射功率。通过分析结构声辐射功率与前4阶声辐射模态之间的关系可知,口盖结构的声辐射功率由第1阶声辐射模态起主导作用。在分析了声辐射模态与结构振动模态关系的基础上,提出增加第1、4、5阶振动模态阻尼的方法来降低口盖的声辐射功率。仿真结果对比显示,该方法有效地降低了口盖的声辐射功率。
The normal vibration velocity of the cap is extracted based on the result of frequency response.The theory of acoustic radiation modes is used to calculate the acoustic radiation power of the structure, and result is in good agreement with that calculated with LMS Virtual.Lab, proving that the theory of acoustic radiation modes can be used to calculate the acoustic power of complex structure.The relationship between acoustic radiation power and the first four acoustic radiation modes are analyzed, showing that the first acoustic radiation mode plays a leading role in the acoustic radiation power of the cap.On the basis of analyzing the relationship between acoustic radiation modes and the structural modes, the method of increasing the modal damping of the first, fourth and fifth order vibration modes is proposed to reduce the acoustic radiation power of the cap.Simulation result shows that this method can reduce the sound radiation power of the cap effectively.
The normal vibration velocity of the cap is extracted based on the result of frequency response.The theory of acoustic radiation modes is used to calculate the acoustic radiation power of the structure, and result is in good agreement with that calculated with LMS Virtual.Lab, proving that the theory of acoustic radiation modes can be used to calculate the acoustic power of complex structure.The relationship between acoustic radiation power and the first four acoustic radiation modes are analyzed, showing that the first acoustic radiation mode plays a leading role in the acoustic radiation power of the cap.On the basis of analyzing the relationship between acoustic radiation modes and the structural modes, the method of increasing the modal damping of the first, fourth and fifth order vibration modes is proposed to reduce the acoustic radiation power of the cap.Simulation result shows that this method can reduce the sound radiation power of the cap effectively.
引文
[1]Borgiotti G V.The power radiated by a vibrating body in an acoustic fluid and its determination from boundary measurements[J].Acoust.Soc.Am.,1990,88(4):1884-1893
[2]Curnfare K A.The radiation modes of baffled finite plates[J].Acoust.Soc.Am.,1995,98(3):1570-1580
[3]姜哲.声辐射问题中的模态分析(Ⅰ)-理论[J].声学学报,2004,29(4):373-378JIANG Zhe A modal analysis for the acoustic radiation problems(Ι)-theory[J].Acta Acstica,2004,29(4):373-378.(in Chinese)
[4]李双,陈克安.结构振动模态和声辐射模态之间的对应关系及其应用[J].声学学报,2007,32(2):171-177LI Shuang CHEN Ke’an The relationship between acoustic radiation modes and structural modes and its applications[J].Acta Acstica,2007,32(2):171-177(in Chinese)
[5]毛崎波,陈小超.通过声辐射模态计算矩形薄板的模态辐射效率[J].机械设计与制造,2013,7(7):108-110MAO Qi-bo CHEN Xiao-chao Calculation of Modal Radiation Efficiency of a Rectangular Thin Plate by Using Radiation Mode Approach[J].Machinery Design and Manufacture,2013,7(7):108-110(in Chinese)
[6]诺顿M P.工程噪声和振动分析基础[M].北京:航空工业出版社,1993
[7]Fahy F.“Sound and structural vibration,radiation,transmission and response”[M],Second edition,Academic Press,London,2007,166-167
[8]詹福良,徐俊伟.声学仿真入门到精通[M].西安:西北工业大学出版社,2013
[9]毛崎波,姜哲.通过声辐射模态研究结构声辐射的有源控制[J].声学学报,2001,26(3):277-281MAO Qi-bo JIANG Zhe Research on active structural acoustic control by radiation modes[J].Acta Acstica,2001,26(3):277-281(in Chinese)
[2]Curnfare K A.The radiation modes of baffled finite plates[J].Acoust.Soc.Am.,1995,98(3):1570-1580
[3]姜哲.声辐射问题中的模态分析(Ⅰ)-理论[J].声学学报,2004,29(4):373-378JIANG Zhe A modal analysis for the acoustic radiation problems(Ι)-theory[J].Acta Acstica,2004,29(4):373-378.(in Chinese)
[4]李双,陈克安.结构振动模态和声辐射模态之间的对应关系及其应用[J].声学学报,2007,32(2):171-177LI Shuang CHEN Ke’an The relationship between acoustic radiation modes and structural modes and its applications[J].Acta Acstica,2007,32(2):171-177(in Chinese)
[5]毛崎波,陈小超.通过声辐射模态计算矩形薄板的模态辐射效率[J].机械设计与制造,2013,7(7):108-110MAO Qi-bo CHEN Xiao-chao Calculation of Modal Radiation Efficiency of a Rectangular Thin Plate by Using Radiation Mode Approach[J].Machinery Design and Manufacture,2013,7(7):108-110(in Chinese)
[6]诺顿M P.工程噪声和振动分析基础[M].北京:航空工业出版社,1993
[7]Fahy F.“Sound and structural vibration,radiation,transmission and response”[M],Second edition,Academic Press,London,2007,166-167
[8]詹福良,徐俊伟.声学仿真入门到精通[M].西安:西北工业大学出版社,2013
[9]毛崎波,姜哲.通过声辐射模态研究结构声辐射的有源控制[J].声学学报,2001,26(3):277-281MAO Qi-bo JIANG Zhe Research on active structural acoustic control by radiation modes[J].Acta Acstica,2001,26(3):277-281(in Chinese)