Date of Award


Publication Type

Master Thesis

Degree Name



Mechanical, Automotive, and Materials Engineering

First Advisor

Gaspar, R.


Engineering, Mechanical.




Research was conducted on the use of mechanical signature analysis techniques for the detection of piston slap in internal combustion engines. The non destructive diagnosis of faults, such as piston slap, is worth a great deal both in reputable and monetary terms to engine manufacturers. This encouraged an engine manufacturer to begin field studies into techniques which could diagnose these faults, prompting this research. These studies were conducted with engines containing piston slap in at least one cylinder and with engines containing altered piston parameters that are traditionally thought to affect piston slap. Data was collected from each engine, cylinder by cylinder, using an accelerometer positioned directly over each cylinder wall on the block of the engine. This data was processed by mechanical signature analysis techniques and the results were analyzed. Analysis of the data revealed that the energy envelope of the time domain average signal and the variance analysis of the signal are very effective techniques for the detection of piston slap. The characteristic pattern of piston slap in these techniques is sharp peaks located at the crank angles associated with ignition. In some cases these peaks can be found at the bottom dead center of the piston stroke. (Abstract shortened by UMI.)Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1989 .M555. Source: Masters Abstracts International, Volume: 30-03, page: 0866. Supervisor: R. G. S. Gaspar. Thesis (M.A.Sc.)--University of Windsor (Canada), 1989.