Project ARTEMIS Acoustic Source. Characteristics of the Type TR 11F Transducer Element.

摘要

Four Massa TR-11C transducer elements, of the type used in the ARTEMIS acoustic source, were mechanically and electrically modified to realize an increased power handling capability and to facilitate a parallel electrical connection of elements in an array. The modified elements, designated type TR-11F, were fitted with new springs designed to operate continuously with cyclic deflections of 22 mils peak to peak replacing the original springs which had a maximum safe deflection amplitude of approximately ten mils peak to peak. The original magnet coils were replaced with coils having a larger number of turns of smaller wire. The resulting increased impedance facilitates a parallel connection of elements in that six parallel connected TR-11F elements would have the same impedance as six series connected TR-11C elements. The present ARTEMIS source utilizes a configuration of parallel electrical connection to groups of six series connected elements. The modification also incorporates an altered air gap configuration and special instrumentation to permit measurements of spring deflections. This report describes tests in which the four modified elements were operated with a water load at the maximum design spring deflection for approximately 10,000,000 cycles. Mechanical, electrical and acoustic measurements obtained during and following the endurance tests indicated that the elements were not damaged by operation at this level. (Author) .