(HP-97) A Closed-Form Solution for Noise Contours

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An extract of the SUMMARY from A Closed-Form Solution for Noise Contours, Elwood C. Stewart, NASA Technical Paper 1432, 1979.
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In this report is described an analytical approach for generating noise contours that overcomes the difficulties of existing programs. Although many noise-contour programs are available, they require large computers and a sustained major effort for use, are complex and slow, and are generally not desirable for interactive use for on-line piloted-simulator use. The method developed here is valid for arbitrarily complex paths and reveals the importance of various factors that influence contour shape and size. The calculations are simple enough to be implemented on a small, hand-held programmable calculator, and a program for the HP-67 calculator is illustrated. The method is fast, simple, and gives the area, the contour, and its extremities for arbitrary flight paths for both takeoffs and landings.
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thorough & interesting read

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