Acoustic Event Signatures for Damage Control: Water Events and Shipboard Ambient Noise

摘要

The objective of this report is to demonstrate the feasibility of detecting water-related, damage control (DC) events, specifically pipe ruptures and flooding, in a shipboard ambient noise environment and to document the data collected in support of that effort. This report is composed of seven sections. The first two are composed of introductory material. The third section documents the acoustic measurements of water-related DC events made at the NAVSEA Damage Control Engineering Test Facility (DCETF) located at the Ft. McHenry Naval Reserve Center in Baltimore, MD. The measurements include both pipe rupture and flooding noises in different compartments of the facility. The fourth section characterizes the signals measured by their spectra and time histories, and provides some initial impressions on the relevant parameters that can be inferred from a given acoustic signature. The fifth section documents the ambient noise measurements made aboard the USS RAMAGE (DDG-61) and the RV ENDEAVOR. The RAMAGE is an Arleigh Burke class destroyer, is 585 ft long and is powered by gas turbine engines. The ENDEAVOR is the research vessel of the University of Rhode Island, is 185 ft long and is powered by diesel engines. The sixth section of the report compares the DC signals to the ambient noise background and demonstrates a basic ability to detect the DC signals in the ambient noise background. A fully developed detection algorithm that is immune to many types of false alarms is not the objective of the section, or the report, rather that it is possible to make reliable detections of the events. The final section of the report summarizes the findings and makes recommendations.