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The Reverberation And Absorption Characteristics Of A Water Filled Chamber With And Without A Pressure Release Wall Lining

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The Reverberation And Absorption Characteristics Of A Water Filled Chamber With And Without A Pressure Release Wall Lining

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Author : K. Anthony Hoover
language : en
Publisher:
Release Date : 1981

The Reverberation And Absorption Characteristics Of A Water Filled Chamber With And Without A Pressure Release Wall Lining written by K. Anthony Hoover and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.

The requirements for a reverberation chamber in air have been described in the appropriate standards, but there is no mention that these same requirements cannot be applied to underwater reverberation chambers. A number of acoustic measurements were made to determine the reverberation time and absorption characteristics of an underwater chamber with and without a pressure-release wall covering. The reverberation times were found to be faster than the transient response times of conventional analog equipment. Therefore, a digital computer was employed to filter the data and to determine the slope, and thus, the reverberation time by using a linear, least-squares curve fit. The pressure-release wall covering was found to reduce the average sound absorption coefficients to values acceptable for a reverberation chamber based on the standards for air acoustics. (Author).

Reverberation Time Measurements In An Underwater Chamber With And Without A Pressure Release Wall Covering

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Author : Richard J. Fridrich
language : en
Publisher:
Release Date : 1978

Reverberation Time Measurements In An Underwater Chamber With And Without A Pressure Release Wall Covering written by Richard J. Fridrich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.

A number of acoustic measurements were made for determining the reverberation time and absorption characteristics of an underwater chamber with and without a pressure-release wall covering. Several analysis methods are described which were investigated and found to be unusable due to limited transient response time of analog filters. A digital analysis method is described which overcomes the transient response time limitation of analog filters by using Fast Fourier Transforms to approximate the desired filtering characteristics. An interactive computer program is described which implements an algorithm for determining the slope of the acoustic decay and, hence, the reverberation time in a consistent manner using linear, least-squares curve fitting. The reverberation times measured with the pressure-release wall covering were on the order of 110 milliseconds, while the values without the wall covering were on the order of 30 milliseconds. The introduction of the pressure-release wall covering into the underwater chamber was found to reduce the average sound absorption coefficients to values acceptable for a reverberation chamber based on air acoustics standards. (Author).

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1982

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Aeronautics categories.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.