Universal diagnostic method and system for engines
First Claim
1. A method for diagnosing an operational state of an engine comprising the steps of:
- (a) providing vibration data from the engine, said data synchronised with respect to the thermo-mechanical cycle of the engine;
(b) transforming the synchronised vibration data in (a) into the frequency domain to obtain a Fourier representation of the vibration produced by the engine;
(c) monitoring the characteristics of the harmonic components of the Fourier representation at least at one predetermined frequency, wherein said predetermined frequency is predetermined according to at least one first predetermined criterion;
(d) analysing the characteristics of the harmonic components obtained in step (c) according to at least one second predetermined criterion to determine the operational state of the engine correlated to said second criterion.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system are provided for diagnosing the health-condition of engines, in particular internal combustion reciprocating engines, in which the harmonic terms of the Fourier series representation of the engine vibration are correlated with the mechanical state of the engine. In particular, the characteristics of the harmonic components of the Fourier representation are monitored at one or more predetermined frequencies according to at least one first predetermined criterion, and the characteristics of these harmonic components are analysed according to at least one second predetermined criterion to determine the operational state of the engine correlated to the second criterion.
-
Citations
34 Claims
-
1. A method for diagnosing an operational state of an engine comprising the steps of:
-
(a) providing vibration data from the engine, said data synchronised with respect to the thermo-mechanical cycle of the engine; (b) transforming the synchronised vibration data in (a) into the frequency domain to obtain a Fourier representation of the vibration produced by the engine; (c) monitoring the characteristics of the harmonic components of the Fourier representation at least at one predetermined frequency, wherein said predetermined frequency is predetermined according to at least one first predetermined criterion; (d) analysing the characteristics of the harmonic components obtained in step (c) according to at least one second predetermined criterion to determine the operational state of the engine correlated to said second criterion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31)
-
-
29. A system for diagnosing the operational state of an engine comprising:
-
(a) measuring means for measuring a vibration signature of the engine generated by the engine with respect to the thermo-mechanical cycle of the engine; (b) data processing means adapted for; (i) transforming the vibration data in (a), after normalisation thereof with respect to the thermo-mechanical cycle of the engine, into the frequency domain to obtain a Fourier representation of the vibration produced by the engine; (ii) monitoring the characteristics of the harmonic components of the Fourier representation at least at one predetermined monitoring frequency according to at least one predetermined first criterion; and (iii) comparing the characteristics of the harmonic components obtained in step (ii) with at least one second predetermined criterion to determine the operational state of the engine correlated to said second criterion. - View Dependent Claims (32, 33, 34)
-
Specification