Signal acquisition module for rotating mechanism, monitoring system, aircraft, and method for monitoring rotating mechanism

Abstract

The invention relates to an acquisition module (10) for a system for monitoring a rotary machine, in particular an aircraft engine. The module comprises at least one sensor (11) for detecting an analog signal x (t) of a physical quantity of a component of the rotary machine, at least one sample-and-hold device (13), wherein the sample holding device (13) is configured to collect samples of the analog signal x (t) at a sampling time tn and to maintain the samples constant between two sampling times tn, and at least one memory (16) for storing the samples. The sample holding device (13) is configured to collect samples of the analog signal x (t) at a randomly defined sampling time tn, the sampling time tn is defined according to the following rule: tn = n [delta] t + [tau] n, and the sampleand the sampling time tn are stored in a memory (16).

Description

technical field [0001] The invention relates to the field of rotating machine monitoring, in particular to the field of aircraft engine monitoring. Background technique [0002] In order to be able to perform preventive maintenance on aircraft engines, it is known to use monitoring systems to track the state of health of the different components of an aircraft engine (eg gears, bearings, moving blades, etc.). [0003] As is known, a monitoring system includes a module for collecting signals (hereinafter referred to as a collection module) and a processing module configured to judge the health status of an aircraft engine by calculating a mathematical estimate. [0004] refer to figure 1 , the acquisition module 110 includes a measurement sensor 111 configured to measure a physical quantity (such as acceleration) and convert the physical quantity into an analog signal x(t), especially an analog voltage signal. The acquisition module 110 includes a sample-and-hold device 113...

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