Machine malfunction may be detected from the change in its noise level sensed by the ear or measured by a sound level meter. When various machines run concurrently in a workshop, it is not easy to detect noise change. This paper presents the development of a system of equations relating to the combined noise level at each machine with the individual noise level and the inter‐machine distances. A method is presented to detect a malfunctioned machine by solving a system of equations and a case study is included.
Al‐Haboubi, M.H. and Selim, S.Z. (2000), "Noise change as an indicator of maintenance requirement", Journal of Quality in Maintenance Engineering, Vol. 6 No. 1, pp. 20-27. https://doi.org/10.1108/13552510010311318
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