Graduate Thesis Or Dissertation
 

Design, construction and testing of torsiograph

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/td96k5125

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  • The crankshaft of an internal combustion engine experiences torsional vibrations which become critical at certain running speeds and can cause overstressing in the crankshaft, leading to failure in some cases. The object of this study was to design, construct and test an instrument to measure these oscillations at one point on the crankshaft. This information along with a knowledge of the natural frequencies and mode shapes of the crankshaft can be used to determine the maximum amplitude of vibration. The output sensitivity of the instrument built compared favorably with that predicted from its analytical model except for an increase in sensitivity with frequencies above approximately 40 hz. This was thought to be due to a characteristic of the calibrator system itself. Torsional vibrations at the front of an engine crankshaft for different speeds and loading conditions were measured with the instrument. The absence of natural frequency and mode shape data for the crankshaft prevented any determination of the maximum amplitudes of vibration. The instrument fulfilled the original criteria and performed satisfactorily in the several hours of testing. When used in conjunction with a storage oscilloscope, it provided a means of monitoring or permanently recording a torsional vibration waveform.
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