DANST-PC is version 3.01 of a computer program for analysis of the statics and dynamics of spur-gear systems. ["DANST" signifies "Dynamic Analysis of Spur Gear Transmissions." A previous version was described in "Computing Stresses in Spur Gears," NASA Tech Briefs, Vol. 19, No. 12 (December 1995), page 73.] The program can be used for parametric studies to predict the static transmission error, dynamic load, tooth-bending stress, and other properties of a pair of external spur gears as they are influenced by operating speed, torque, stiffness, damping, inertia, and tooth profile. DANST performs geometric modeling and dynamic analysis for low- or high-contact-ratio spur gears. It can simulate gear systems with contact ratios ranging from one to three.

DANST is based on a four-degree-of-freedom, lumped-mass model of a gear transmission. The model includes driving and driven gears, connecting shafts, motor, and load. The equations of motion were derived from basic gear geometry and elementary vibration principles. The dynamic solution is found by integrating the equations of motion. The user is provided with many options, including (1) materials, basic gear geometries, and operating conditions; (2) various combinations of tooth profiles (including standard forms of tip relief or user-digitized profile modifications); (3) static or dynamic analysis; and (4) various printed and plotted outputs.

DANST is written in FORTRAN 77 for i386 and above IBM-PC-compatible computers running the MS-DOS, Windows95, or Windows NT operating system. A math coprocessor and VGA display are required. The source code and executable code are provided. DANST-PC has been successfully implemented on an i486DX computer running Windows95. To recompile the source code, one needs the plotting software package PLOT88 from Plotworks Software. The standard distribution medium for DANST-PC is one 3.5-in. (8.89-cm), 1.44MB diskette in MS-DOS format. DANST-PC was released to COSMIC in 1997.

This program was written by Fred B. Oswald of Lewis Research Center,Hsiang H. Lin of the University of Memphis, and Irebert R. Delgado of the U.S. Army. For further information, access the Technical Support Package (TSP) free on-line at www.techbriefs.com under the Mechanics category. LEW-16575

NASA Tech Briefs Magazine

This article first appeared in the August, 1998 issue of NASA Tech Briefs Magazine.

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