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Indicator/signal variation analyzing method for diagnosing power transmission mechanism of e.g. AS332L2 super puma helicopter, involves comparing scale variations data with values, and indicating defect in mechanism based on comparison
Indicator/signal variation analyzing method for diagnosing power transmission mechanism of e.g. AS332L2 super puma helicopter, involves comparing scale variations data with values, and indicating defect in mechanism based on comparison
The method involves searching and subtracting a parasite component (s) in indicator or signal (i), and extracting a noise component (w), and skip and parasite components (b, s) for obtaining a tendency component (c). Scale variations data are calculated from a wavelet transform of the component (c). The variations are compared with several reference values for comparing variations of tendency data with the reference values. A defect in mechanism is indicated based on the comparison. Independent claims are also included for the following: (1) a device for diagnosing a mechanism based on data elaborated from vibratory measurement (2) a program for diagnosing a mechanism based on data elaborated from vibratory measurement.
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