When a sonar body is winched from the sea by a helicopter, growth in amplitude of oscillation of the body occurs. This is demonstrated using a two-dimensional mathematical model. To avoid the possibility of collision with the helicopter, an automatic procedure is proposed in which the body is alternately raised and lowered during defined periods of each oscillation. When the prescribed degree of damping is achieved, the body is raised continuously to the trail position. Performance of the method is judged by the amount of additional raise time required. The procedure is applied to the sonar system used on the Royal Australian Navy's Sea King Mk. 50 helicopter. (Kursetz)
Reduction in swing of a sonar body winched from the sea by a helicopter
Reduzierung der Schwingung eines Sonarkoerpers beim Aufholen aus der See durch einen Hubschrauber
US Government Reports ; Aug ; 1-29
1979
29 Seiten
Report
Englisch
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