Abstract
Hydraulic power is attractive for use in underwater acoustic projectors in the low audio and infrasonic frequency range. This is because of the capability of hydraulic power systems to produce the necessary large linear displacements and forces. The advantages, disadvantages, and design considerations of hydraulically powered underwater projectors of different configurations will be discussed in this paper. Also discussed will be the development of a hydraulically powered projector to be used for transducer calibration. This projector has the design requirement to produce 160 dB re 1 μPa source level at 1 m in the frequency range of 1 to 10 Hz.
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