Application of vibro-acoustic methods in failure diagnostics

Abstract

The present study is concerned with the presentation of diagnostic strategies and methods based on vibro-acoustic signals that are able to check the operation of mechanical structures (e.g. internal combustion engines) or to detect faults on test bench during operation. The main goal of this study is to summarize and review the state-of-the art monitoring procedures and diagnostic methods based on vibrational and acoustical signals by the help of literature sources. A further goal is to familiarize the reader with the theoretical background of these procedures and concepts adjusted to the topic. The paper seeks to illustrate the application of each methods through practical examples, so it may be useful for those who wish to understand what kind of fault can be detected by using vibro-acoustic diagnostic systems. Last, but not least, the arose difficulties and limitations associated with use of this methods are mentioned. This paper is focusing principally on some of signal - based methods in time - and frequency domain, such as Fast Fourier Transformation, Short Time Fourier Transformation, orbit portraits, symmetrized dot pattern method and time synchronous average.