Accession Number : ADD018617

Title :   Field Calibration of the Normal Pressure Transfer Function of a Compliant Fluid-Filled Cylinder

Descriptive Note : Patent Application, Filed 29 May 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Peloquin, Mark S

PDF Url : ADD018617

Report Date : 29 May 1997

Pagination or Media Count : 24

Abstract : A method is presented to calibrate the transfer function for a fluid-filled compliant cylinder as a function of wavenumber and frequency. An air-filled compliant cylinder has a first linear array of force sensors coupled to the cylinder's exterior surface. A turbulent flow field is generated in a fluid environment about the first linear array which generates an output indicative of pressure incident thereupon. A fluid-filled compliant cylinder identical in diameter to the air-filled compliant cylinder houses a second linear array of force sensors. A similar turbulent flow field is generated in the fluid environment about the fluid-filled complaint cylinder to generate an output indicative of pressure incident upon the second linear array. The ratio of outputs is indicative of the transfer function of the fluid-filled compliant cylinder. Each output can be further adjusted by a calibrated sensitivity of the corresponding first and second linear arrays. The method compensates for elastic scattered pressure fields and the wavenumber-frequency dependence of the air-filled compliant cylinder's sensitivity to pressure.

Descriptors :   *TRANSFER FUNCTIONS, *PATENT APPLICATIONS, *HYDROSTATIC PRESSURE, TOWED ARRAYS, TURBULENT FLOW, CYLINDRICAL BODIES, CALIBRATION, HYDROPHONES

Subject Categories : Numerical Mathematics
      Test Facilities, Equipment and Methods
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE