Search

Author Posting. © Acoustical Society of America, 2012. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 131 (2012): 1595-1604, doi:10.1121/1.3675005., Potential physical effects of sonar transmissions on marine mammals were investigated by measuring pressure fields induced in a 119-kg, 211-cm-long, young adult male common dolphin (Delphinus delphis) cadaver. The specimen was instrumented with tourmaline acoustic pressure gauges used as receiving sensors. Gauge implantation near critical tissues was guided by intraoperative, high-resolution, computerized tomography (CT) scanning. Instrumented structures included the melon, nares, ear, thoracic wall, lungs, epaxial muscle, and lower abdomen. The specimen was suspended from a frame equipped with a standard 50.8-mm-diameter spherical transducer used as the acoustic source and additional receiving sensors to monitor the transmitted and external, scattered field. Following immersion, the transducer transmitted pulsed sinusoidal signals at 5, 7, and 10 kHz. Quantitative internal pressure fields are reported for all cases except those in which the gauge failed or no received signal was detected. A full necropsy was performed immediately after the experiment to examine instrumented areas and all major organs. No lesions attributable to acoustic transmissions were found, consistent with the low source level and source-receiver distances., Work supported by NOPP through ONR Grant No. N000140710992. Work at CSI additionally supported by ONR Grant No. N000140811231.

The top-level goal of this project is to build an interactive online modeling and visualization system, called the Virtual Beaked Whale, to enable users to predict mid-frequency sonar-induced acoustic fields inside beaked whales and other marine mammals. Another high-level goal is to acquire new high-resolution morphometric and physical-property data on beaked whales for use in the model. It is hoped that the availability of such a system, together with high-quality data, will give researchers insight into the nature of sonar interactions with beaked whales, and may prove useful in evaluating alternate sonar transmit signals that retain the required information content but with less effect., Prepared in cooperation with Boston University, NSWC Carderock, West Bethesda, MD, Mount Sinai School of Medicine, New York, NY, and the Georgia Institute of Technology, Atlanta, GA.

The top-level goal of this project is to build an interactive online modeling and visualization system, called the Virtual Beaked Whale, to enable users to predict mid-frequency sonar-induced acoustic fields inside beaked whales and other marine mammals. Another high-level goal is to acquire new high-resolution morphometric and physical-property data on beaked whales for use in the model. It is hoped that the availability of such a system, together with high-quality data, will give researchers insight into the nature of sonar interactions with beaked whales, and may prove useful in evaluating alternate sonar transmit signals that retain the required information content but with less effect., Prepared in collaboration with Woods Hole Oceanographic Institution, Woods Hole, MA; Center for Anatomy and Functional Morphology, Mount Sinai School of Medicine, New York, NY; and Applied Research Laboratory, Washington DC Area Offices, Pennsylvania State University, Arlington, VA.

The top-level goal of this project is to build an interactive online modeling and visualization system, called the Virtual Beaked Whale, to enable users to predict mid-frequency sonar-induced acoustic fields inside beaked whales and other marine mammals. Another high-level goal is to acquire new high-resolution morphometric and physical-property data on beaked whales for use in the model. It is hoped that the availability of such a system together with high-quality data will give researchers insight into the nature of sonar interactions with beaked whales, ultimately to introduce objectivity into a public discussion that has been hampered by lack of a scientific approach. It is hoped further that the tool will prove useful in evaluating alternate sonar transmit signals that retain the required information content but with substantially reduced physical effects in beaked whales., Prepared in cooperation with Naval Surface Warfare Center (NSWC), Bethesda, MD; Mount Sinai School of Medicine, New York, NY; and Pennsylvania State University, Arlington, VA. The original document contains color images.

The top-level goal of this project is to build an interactive online modeling and visualization system, called the Virtual Beaked Whale, to enable users to predict mid-frequency sonar-induced acoustic fields inside beaked whales and other marine mammals. Another high-level goal is to acquire new high-resolution morphometric and physical-property data on beaked whales for use in the model. It is hoped that the availability of such a system together with high-quality data will give researchers insight into the nature of sonar interactions with beaked whales, ultimately to introduce objectivity into a public discussion that has been hampered by lack of a scientific approach. It is hoped further that the tool will prove useful in evaluating alternate sonar transmit signals that retain the required information content but with substantially reduced physical effects in beaked whales., A National Oceanographic Partnership Program Award. The original document contains color images. Prepared in cooperation with Mount Sinai School of Medicine, Ctr. for Anatomy and Functional Morphology, New York, NY 10029-6574 and Penn State Univ., Applied Research Lab., Arlington, VA 22203-1708.

To date, nearly all efforts in the field of accidental explosion consequence determination have been aimed at the quantification of the effects of a Hazard Division (HD) 1.1 event. Little attention has been paid to the consequences of the ignition of stacks of Hazard Division 1.2 ammunition. In 1989, NATO AC/258 (Group of Experts on the Safety Aspects of Transportation and Storage of Military Ammunition and Explosives) agreed that a program of trials should be carried out to investigate the consequences of an HD 1.2 event. The goal of these trials would be twofold: to gain basic knowledge about HD 1.2 phenomena and to revise the current NATO quantity-distance relationships for HD 1.2 events. As a result of the NATO interest, a joint UK/US experimental program was started in 1990. To date, seven tests have been conducted: three single-pallet tests (30 projectiles/test), two eight-pallet tests (240 projectiles/test), one twenty-seven pallet test (864 projectiles), and one three-pallet test (96 projectiles loaded with Composition B). This report describes the test program, the instrumentation which was utilized, and summarizes some of the results which have been obtained., See also ADM000767. Presented at the Department of Defense Explosives Safety Seminar (26th) held in Miami, Florida on 16-18 August 1994. Published in the Proceedings of the Department of Defense Explosives Safety Seminar (26th), 1994.