Study on the measurement of oil-film pressure of engine main bearing by thin-film sensor — The influence of bearing deformation on pressure sensor output under engine operation

In a previous paper, oil-film pressure in an engine main bearing was measured by a using thin-film Manganin sensor. This sensor had adequate sensitivity to strain and temperature in terms of measurement principle. In this study, more accurate measurement of oil-film pressure was allowed by the formation of the newly developed thin-film strain sensor made of Ni-Cr-Al at the same location as that of the Manganin pressure sensor, and the correction of measurement errors caused by strain. The characteristics of bearing metal surface strain varied by engine operating conditions are also shown in this paper.