The condition monitoring of diesel engines using acoustic signal analysis

Abstract

<span>Engine have become one of the supportive asset for many activity and work, therefore engine need attention for its condition. The easiest way to do is through the acoustic sound of the engine itself. Most of the time, the engine sounds are checked using a traditional way that may causing a debate regarding its condition. This is due to no supportive scientific basis to know about engine condition using their own acoustic sound. A value from its frequency pattern is needed as scientific basis to determine an engine condition using acoustic sound. Method of envelope extraction by hilbert transform, fast fourier transform, and correlation coefficient are used to find that value. A series of tests have been carried out on the values that have been found and the result are promising for telling engine condition, but unfortunately the values has not been able to identify type of damage that occur on the engine.</span>

Time frequency analysis of ultrasound doppler signal by s-transform and wigner-ville distribution

“…This transform provides information on the frequency components of the signal studied; their amplitude and their phase. The major disadvantage of this application is that it causes a loss of information concerning their temporal location [3]- [5].…”