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Mobility/radiation factor evaluations as design aids for high performance vehicles

 

作者: B. E. Douglas,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1976)
卷期: Volume 59, issue S1  

页码: 2-2

 

ISSN:0001-4966

 

年代: 1976

 

DOI:10.1121/1.2002622

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

The application of mechanical mobility and radiation factor methods to augment standard structure‐borne and airborne noise surveys in diagnosing structural contributions to vibroacoustic deficiencies on high performance vehicles is considered. Emphasis is placed on the development of a field‐oriented analysis method based on a normal mode interpretation of mobility and radiation factor measurements to characterize the dynamic response of the structural elements of such vehicles. These characteristics (i.e., natural frequencies, modal loss factors, mode shapes, relative noise transmission path strengths, modal density, termination mobilities, and acoustic radiation efficiencies) provide information which influences the selection, design, and performance of all transmission path noise control methods that are applicable to corrective redesign. The effects of modal density on such an analysis approach are briefly examined along with techniques to resolve modal information from normal modes closely spaced in the frequency domain. Applications of the methods to shipboard noise problems are presented. Mobility/radiation factor evaluations were found to provide an economical means of obtaining vibroacoustic design information for high performance vehicles where transverse modes govern the vibratory response of the vehicular shell.

 

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