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Comparison of measurement of piston deformation using holographic interferometry and finite elements

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Abstract

Holographic interferometry was used to measure the thermal expansion of a diesel-engine piston and the results are compared with those predicted by a finite-element model. Various assumptions were made in the generation of the model and the holographic results provided a means of assessing the effects of these assumptions on the deformed profile of the piston. A holographic rig has been developed that enables one to measure simultaneously the deformation on the front and rear surfaces of the piston using a single holographic plate and hence detect any body displacement. A simple ‘mirror’ concept is introduced that can be used to measure in-plane and out-of-plane displacements simultaneously. The holographic results showed expansion values of ten-percent greater than the predictions of the model at midskirt level of the piston. A closer agreement of the results were observed at other levels of the skirt.

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Authors and Affiliations

  1. Mechanical and Manufacturing Engineering, Polytechnic of Wales, Pontypridd, CF37 IDL, Mid-Glamorgan, UK

    M. M. Ratnam (Research Student) & W. T. Evans (Reader)

Authors
  1. M. M. Ratnam
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  2. W. T. Evans
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Ratnam, M.M., Evans, W.T. Comparison of measurement of piston deformation using holographic interferometry and finite elements. Experimental Mechanics 33, 336–342 (1993). https://doi.org/10.1007/BF02322150

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  • DOI: https://doi.org/10.1007/BF02322150

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