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Abstract

The impact phenomenon associated with the loss of contact of a pair of spur gears driven under load has been investigated. A specially designed test rig with its measuring instruments has been used to measure and record the dynamic response of the loaded gear system with a variety of parameter changes.

An advanced Fourier Analyser has also been utilized to analyse and plot the frequency spectrum of the strain in the output shaft. In addition a simplified digital simulation model is developed to reproduce the experimental results. Numerical tooth shifting has been introduced to involve the idea of internal input rather than external input to simulate gear tooth meshing.

The geared system when running free or loaded is found to oscillate at frequencies equal to gear speed and its integral multiples for speeds lower than 1100 rev/min. When running at speeds starting from 1100 rev/min and over the geared torsional system is found to oscillate at frequencies equal to half the gear shaft corresponding running frequency and its integral multiples. The subharmonic oscillation is observed with and without load for this test setup, except when running at speeds of1700 rev/min and over, and loading of 4 lbf.ft (5.424 N m).

Publication Type:	Thesis (Doctoral)
Subjects:	T Technology > TJ Mechanical engineering and machinery
Departments:	School of Science & Technology > Engineering School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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