The application of accelerometers to the measurement of compliant baffle characteristics: Effects of sensor size and mass
- BBN Acoustic Technologies, A Division of Bolt Beranek and Newman Inc., 70 Fawcett Street, Cambridge, Massachusetts 02138 (United States)
Compliant layers find use in sonar applications for the purpose of reducing either the surface motion or fluid pressure transmitted to sonar elements due to structural vibration of the underlying ship structure. Although the characterization of candidate compliant materials has traditionally been accomplished using hydrophones, recent test capabilities have employed accelerometers at the compliant surface. For excitation of the compliant layer at acoustic wavenumbers the interaction of the mass of the sensor with the surface compliance leads to a resonant response which reduces the accuracy of the measurement. This effect is mitigated by adding syntactic foam to produce a composite sensor which is neutrally buoyant. For excitations at wavenumbers greater than the acoustic wavenumber (e.g.: plate flexural wavenumbers) neutrally buoyant sensors continue to interact with the compliant surface to reduce the sensor response. Increases in sensor height lead to reductions in sensor response. Finite element calculations combined with simple analytic models have been used to evaluate the requirements on sensor mass and size in order to make accurate measurements of compliant layer characteristics. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 288404
- Report Number(s):
- CONF-9509298-; ISSN 0094-243X; TRN: 9615M0144
- Journal Information:
- AIP Conference Proceedings, Vol. 368, Issue 1; Conference: Acoustic velocity sensor focused workshop, Mystic, CT (United States), 12-13 Sep 1995; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
A sensor for measuring low frequency surface vibration of a fluid loaded compliant structure
Large area planar fiber optic accelerometers for measurement of acoustic velocity