paul

this is the program we will use to optimize the gear set in the new redrive.

Tony



You mean your going to make a custom gear set for over $1000
dollars when you can buy a mass produced set for $100 from Ford
that works and has been used in rotary powered experimental air craft
since 1973?

Paul Lamar

Program for Analyzing Static Transmission Error of Helical Gears

John H. Glenn Research Center, Cleveland, Ohio

Wednesday, November 01 2000

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The computer program HeliStat performs finite-element analysis to simulate
meshing of helical gears. This program is a logical extension of the program
DANST, which applies to spur gears. [DANST was described in "Computing
Stresses in Spur Gears (LEW-15420), NASA Tech Briefs, Vol. 19, No. 12
(December 1995), page 73 and "Updated Program for Computing Stresses in Spur
Gears (LEW-16575) NASA Tech Briefs, Vol. 22, No. 8 (August 1998), page 59.]

HeliStat performs a geometric tooth-contact analysis to determine the lines
of tooth contact, and then it performs a three-dimensional linear static
analysis to determine tooth-meshing stiffness, tooth deflections under
static load, and the static transmission error. The results of the static
analysis are available to the user in the form of static transmission error
as a function of rotation as well as the peak-to-peak transmission error.
Since the transmission error is the major source of dynamic excitation that
causes gear vibration and noise, HeliStat can help a gear designer develop
quiet gears.

The mathematical model upon which HeliStat is based includes representations
of the driving and driven gears, connecting shafts, and supporting bearings.
The model also includes provisions for gear-tooth modifications either
perpendicular to the lines of contact (cross-modification) or in the profile
and longitudinal directions. HeliStat can be used for parametric studies of
the effects on the transmission error of helical-gear systems due to torque,
tooth stiffness, and gear-tooth modifications.

This program was written by H. H. Lin of the University of Memphis and Fred
B. Oswald of Glenn Research Center.

Inquiries concerning rights for the commercial use of this invention should
be addressed to NASA Glenn Research Center, Commercial Technology Office,
Attn: Steve Fedor, Mail Stop 4 -8, 21000 Brookpark Road, Cleveland, Ohio
44135. Refer to LEW-16877.

 

 

 

Eric J. Roulo

Structural Mechanics Corporation

 <mailto:roulo@structuralmechanics.com> roulo@structuralmechanics.com

(650) 580-1745