Abstract
An underwater sound source using a hydraulic-drive mechanism is subject to signal distortion produced by the electrohydraulic control valve. The nonlinear characteristics of the commonly used valves are described reasonably accurately by a well-known equation derived from Bernoulli's law. A numerical study was made of the effects of the valve nonlinearity on transducer performance, using the Runge-Kutta-Gill algorithm to solve the nonlinear differential equations. Load lines and waveforms were plotted and Fourier distortion components computed for typical operating conditions. The results show that the limitations necessary on the pressure modulation coefficient for low output distortion and show the benefits of resonance in providing a favorable load line, thus confirming and quantifying the design principles used by those who developed the hydroacoustic transducer art.
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