This paper describes a programme of trials of thick-film dynamic strain sensors made using 'piezoelectric paint'. The fabrication process is described and it is shown that the sensitivity is comparable with that of other thick-film sensors and the piezoelectric polymer polyvinylidenefluoride (PVDF). A series of dynamic and environmental tests is described. The dynamic range and bandwidth are shown to be suitable for structural vibration monitoring, and to be largely unaffected by adverse environments (rain, frost, sunlight, etc.).
This paper describes the design, construction and initial testing of an experimental rig for the measurement of dynamic loading of an automotive timing chain under realistic running conditions. The novel instrumentation system developed for this application is described, together with the mechanical construction of the measurement system. Results are presented for a two-sprocket drive under constant load. Clear variations in chain link tension around the chain loop are shown, and these are explained in terms of position, sprocket run-out and sprocket polygonal action.
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