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Radiated sound energy of a fluid‐loaded cylinder as a function of force time duration and multiple pulse time spacing

 

作者: Daniel H. Kruger,   J. Adin Mann,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1994)
卷期: Volume 96, issue 1  

页码: 564-572

 

ISSN:0001-4966

 

年代: 1994

 

DOI:10.1121/1.410441

 

出版商: Acoustical Society of America

 

关键词: SHELLS;CYLINDRICAL CONFIGURATION;PULSES;ACOUSTIC EMISSION;MECHANICAL VIBRATIONS;STATIC LOADS;TIME DOMAIN ANALYSIS;ACOUSTICAL HOLOGRAPHY

 

数据来源: AIP

 

摘要:

Transfer functions measured by near‐field acoustical holography (NAH) are used to simulate the sound radiated by a point‐driven, fluid‐loaded, cylindrical shell with spherical end caps in the time domain for a variety of force inputs. This paper represents a continuation of work described in an earlier paper [J. Acoust. Soc. Am.90, 1656–1664 (1991)]. Radiated sound energy from the shell as a function of force time duration and time separation between multiple pulses in a force is studied. A single pulse consists of a single frequency cosine wave that is Gaussian windowed. A multiple pulse consists of several equally time spaced single pulses. As the time duration of force pulses or spacing between force pulses is varied, the fraction of input mechanical energy which is radiated as sound to the far field varies greatly. For example, as the time separation varies between two pulses in a single force time history, the fraction of sound energy radiated to the far field varied from one third to three halves of the sound energy radiated if the force time history were a single pulse. A frequency domain model is used to explain the variation. Since input mechanical energy is either absorbed by the shell or radiated as sound, the results show that it is possible to force more energy to be mechanically damped in the shell by adding a second pulse to the force, reducing the amount radiated as sound. These properties are noticed when results are observed in the time domain while also considering the frequency domain model.

 

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