UNDERWATER SOUND RAYS AND TRANSMISSION LOSS USING AN ANALOG COMPUTER,

A presentation is made of the steps followed in the development of an analog computer program which is used to generate sound raypaths and to compute sound transmission losses due to ray dive and absorption. Inputs to the program are sound projector depth, velocity of sound at this depth, and velocity gradient as a function of depth only. The implemented equations are briefly described together with the approximations used. Simplified block and schematic diagrams are shown to describe the logical development of the program and to clarify points under discussion. Typical plots of raypaths, intensity contours, and depth dependence of the sound velocity are presented along with some discussion as to computer sensitivity and accuracy of results. Approxima tions to the implemented equations and the accompanying simplifications resulting are discussed from the standpoint of accuracy. A set of operating instructions pertinent to an Electronic Associate Analog Computer Model 16-31R when using the resulting program is included in Appendix A. Author