Melville 2012 Acoustic Test Report

R/V MELVILLE acoustic signature was successfully measured during this acoustic test. The levels of the EM 122 were controlled by a combination of propeller and anti-roll tank transients.

The general acoustic levels of MELVILLE were good and should produce excellent bathymetric data results:

  • At low speeds (up to 8 knots) sonar levels were controlled by a combination of sea-state and local machinery
  • At mid speeds (8 to 10 knots) sonar levels were controlled by hydrodynamic flow noise
  • At high speed (above 10 knots) sonar levels were controlled by propeller cavitation
  • Propeller cavitation was determined to incept at a vessel speed of approximately 10 knots
  • Anti roll tank transients were present during vessel rolling motions and
    caused significant increases and variability of sonar levels
  • A bad channel was discovered on the port receiver array board

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MELLVILE_FINAL_REPORT_version2.pdf2.58 MB