Hydroacoustic research capabilities in the large water tunnel at ARL Penn state

Richard Chostner Marboe, Richard M. Weyer, Michael Lester Jonson, Donald E. Thompson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The Garfield Thomas Water Tunnel (GTWT) at the Applied Research Laboratory of The Pennsylvania State University is a 1.22m diameter test section, closed circuit water tunnel for hydrodynamic and hydroacoustic research. Acoustic measurements can be made with window or model flush mounted transducers, a focusing dish hydrophane mounted in a water tank above the test section, or with a 37 element array mounted downstream in the settling section. The acoustic sensors and environment of the largest water tunnel at ARL will be used to demonstrate the application and analysis of the passive sonar equation relative to making acoustic measurements in the controlled conditions of a water tunnel as well as for frequent background noise level analysis to ensure data validity. However, the paper will show that the magnitude of most individual elements cannot be accurately determined due to the boundary conditions of the tunnel. As a result, in-situ calibrations are relied upon to give a magnitude for combinations of the elements. Overall background levels for several sensors and tunnel conditions are presented as functions of velocity in terms of 'minimum measurable source level' for a test model which includes the transmission characteristics within the tunnel and the sensor's noise masking level. The current signal processing capabilities, in-situ calibration methodology, and proposed signal processing and background rejection improvements, including array improvements and acoustic nearfield holography, are all discussed.

Original languageEnglish (US)
Title of host publicationFlow Noise Modeling, Measurement, and Control
EditorsTheodore M. Farabee, William L. Keith, Richard M. Lueptow
PublisherPubl by ASME
Pages125-135
Number of pages11
Volume15
ISBN (Print)0791810054
StatePublished - 1993
EventProceedings of the 1993 ASME Winter Annual Meeting - New Orleans, LA, USA
Duration: Nov 28 1993Dec 3 1993

Other

OtherProceedings of the 1993 ASME Winter Annual Meeting
CityNew Orleans, LA, USA
Period11/28/9312/3/93

Fingerprint

hydraulic test tunnels
Underwater acoustics
underwater acoustics
Tunnels
tunnels
acoustic measurement
Water
signal processing
sensors
Acoustics
acoustics
parabolic reflectors
sonar
Sensors
Signal processing
settling
background noise
Acoustic holography
masking
Calibration

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Acoustics and Ultrasonics

Cite this

Marboe, R. C., Weyer, R. M., Jonson, M. L., & Thompson, D. E. (1993). Hydroacoustic research capabilities in the large water tunnel at ARL Penn state. In T. M. Farabee, W. L. Keith, & R. M. Lueptow (Eds.), Flow Noise Modeling, Measurement, and Control (Vol. 15, pp. 125-135). Publ by ASME.
Marboe, Richard Chostner ; Weyer, Richard M. ; Jonson, Michael Lester ; Thompson, Donald E. / Hydroacoustic research capabilities in the large water tunnel at ARL Penn state. Flow Noise Modeling, Measurement, and Control. editor / Theodore M. Farabee ; William L. Keith ; Richard M. Lueptow. Vol. 15 Publ by ASME, 1993. pp. 125-135
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Marboe, RC, Weyer, RM, Jonson, ML & Thompson, DE 1993, Hydroacoustic research capabilities in the large water tunnel at ARL Penn state. in TM Farabee, WL Keith & RM Lueptow (eds), Flow Noise Modeling, Measurement, and Control. vol. 15, Publ by ASME, pp. 125-135, Proceedings of the 1993 ASME Winter Annual Meeting, New Orleans, LA, USA, 11/28/93.

Hydroacoustic research capabilities in the large water tunnel at ARL Penn state. / Marboe, Richard Chostner; Weyer, Richard M.; Jonson, Michael Lester; Thompson, Donald E.

Flow Noise Modeling, Measurement, and Control. ed. / Theodore M. Farabee; William L. Keith; Richard M. Lueptow. Vol. 15 Publ by ASME, 1993. p. 125-135.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - The Garfield Thomas Water Tunnel (GTWT) at the Applied Research Laboratory of The Pennsylvania State University is a 1.22m diameter test section, closed circuit water tunnel for hydrodynamic and hydroacoustic research. Acoustic measurements can be made with window or model flush mounted transducers, a focusing dish hydrophane mounted in a water tank above the test section, or with a 37 element array mounted downstream in the settling section. The acoustic sensors and environment of the largest water tunnel at ARL will be used to demonstrate the application and analysis of the passive sonar equation relative to making acoustic measurements in the controlled conditions of a water tunnel as well as for frequent background noise level analysis to ensure data validity. However, the paper will show that the magnitude of most individual elements cannot be accurately determined due to the boundary conditions of the tunnel. As a result, in-situ calibrations are relied upon to give a magnitude for combinations of the elements. Overall background levels for several sensors and tunnel conditions are presented as functions of velocity in terms of 'minimum measurable source level' for a test model which includes the transmission characteristics within the tunnel and the sensor's noise masking level. The current signal processing capabilities, in-situ calibration methodology, and proposed signal processing and background rejection improvements, including array improvements and acoustic nearfield holography, are all discussed.

AB - The Garfield Thomas Water Tunnel (GTWT) at the Applied Research Laboratory of The Pennsylvania State University is a 1.22m diameter test section, closed circuit water tunnel for hydrodynamic and hydroacoustic research. Acoustic measurements can be made with window or model flush mounted transducers, a focusing dish hydrophane mounted in a water tank above the test section, or with a 37 element array mounted downstream in the settling section. The acoustic sensors and environment of the largest water tunnel at ARL will be used to demonstrate the application and analysis of the passive sonar equation relative to making acoustic measurements in the controlled conditions of a water tunnel as well as for frequent background noise level analysis to ensure data validity. However, the paper will show that the magnitude of most individual elements cannot be accurately determined due to the boundary conditions of the tunnel. As a result, in-situ calibrations are relied upon to give a magnitude for combinations of the elements. Overall background levels for several sensors and tunnel conditions are presented as functions of velocity in terms of 'minimum measurable source level' for a test model which includes the transmission characteristics within the tunnel and the sensor's noise masking level. The current signal processing capabilities, in-situ calibration methodology, and proposed signal processing and background rejection improvements, including array improvements and acoustic nearfield holography, are all discussed.

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EP - 135

BT - Flow Noise Modeling, Measurement, and Control

A2 - Farabee, Theodore M.

A2 - Keith, William L.

A2 - Lueptow, Richard M.

PB - Publ by ASME

ER -

Marboe RC, Weyer RM, Jonson ML, Thompson DE. Hydroacoustic research capabilities in the large water tunnel at ARL Penn state. In Farabee TM, Keith WL, Lueptow RM, editors, Flow Noise Modeling, Measurement, and Control. Vol. 15. Publ by ASME. 1993. p. 125-135