Accession Number : ADA264968


Title :   Global Dynamic Modeling of a Transmission System


Descriptive Note : Final contractor rept.,


Corporate Author : AKRON UNIV OH


Personal Author(s) : Choy, F K ; Qian, W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264968.pdf


Report Date : Apr 1993


Pagination or Media Count : 163


Abstract : This report outlines the work performed on global dynamic simulation and noise correlation of gear transmission systems. The objective of this work is to develop a comprehensive procedure to simulate the dynamics of the gear transmission system coupled with the effects of gear box vibrations. The developed numerical model is benchmarked with results from experimental tests. The modal synthesis approach is used to develop the global transient vibration analysis procedure used in the model. Modal dynamic characteristics of the rotor-gear-bearing system are calculated by the matrix transfer method while those of the gear box are evaluated by the finite element method (NASTRAN). A three-dimensional, axial-lateral coupled bearing model is used to couple the rotor vibrations with the gear box motion. The vibrations between the individual rotor systems are coupled through the non-linear gear mesh interactions. The global equations of motion are solved in modal coordinates and the transient vibration of the system is evaluated by a variable time-stepping integration scheme. The relationship between housing vibration and resulting noise of the gear transmission system is generated by linear transfer functions using experimental data. A nonlinear relationship of the noise components to the fundamental mesh frequency is developed using the hypercoherence function.


Descriptors :   *VIBRATION , *ROTORS , *HOUSINGS , *TRANSMISSION GEARS , *GEAR NOISE , COMPUTER PROGRAMS , EQUATIONS OF MOTION , FINITE ELEMENT ANALYSIS , FRICTION , MESH , DISPLACEMENT , DYNAMICS , MATHEMATICAL MODELS


Subject Categories : Machinery and Tools


Distribution Statement : APPROVED FOR PUBLIC RELEASE