# US 2021/0080352 A1 · Acquisition module for a system for monitoring a rotating machine,monitoring system and method

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- Number: US 2021/0080352 A1
- Document ID: US20210080352A1
- Status: Published application
- Kind: A1
- Application number: 17/045,690
- Filed: 2019-04-02
- Published: 2021-03-18
- Earliest claimed: 2018-04-09
- Assignees: Safran
- Applicants: Safran
- Inventors: Dany Abboud; Mohamed El Badaoui
- Web page: https://patentgrep.com/patent/US20210080352A1

## CPC

- G01M 15/14: Testing gas-turbine engines or jet-propulsion engines
- G01M 15/02: Details or accessories of testing apparatus
- H03M 1/128: {at random intervals, e.g. digital alias free signal processing [DASP]}
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)

## Abstract

The invention relates to an acquisition module for a monitoring system of a rotating machine, in particular of an aircraft engine, the acquisition module comprising at least one measurement sensor for measuring an analogue signal x(t) of a physical quantity of a member of the rotating machine, at least one sample-and-hold device configured to collect a sample of the analogue signal x(t) at sampling times t n and to maintain it constant between two sampling times t n, and at least one memory for storing samples, the sample-and-hold device being configured to collect a sample of the analogue signal x(t) at sampling times t n defined in a random manner, the sampling times t n being defined according to the following law t n=nΔ t+τ n, the samples and the sampling times t n being stored in the memory.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

An acquisition module for a system for monitoring a rotating machine, in particular an aircraft engine, the acquisition module comprising:
at least one sensor for measuring an analog measurement signal x(t) of a physical quantity of a part of the rotating machine,
at least one sample and hold device configured to collect a sample of the analog signal x(t) at sampling times tn and to maintain it constant between two sampling times tn,
at least one memory for storing samples
acquisition module wherein the sample and hold device is configured to collect a sample of the analog signal x(t) at sampling times tn defined in a random manner, the sampling times tn being defined according to the following law
tn=nΔt+τn
in which
n is a natural integer
Δt=1/fe where fe is the sampling frequency of the sample and hold device
τn is a random variable having a uniform probability law over
[
-
Δ
t
2

;
+
Δ
t
2
]
the samples and the sampling times tn being stored in the memory.

### Claim 12 (depends on 11)

The acquisition module according to claim 11, comprising at least one analog bandpass filter having a cut-off frequency fcut, the analog bandpass filter being positioned between the measurement sensor and the sample and hold device.

### Claim 13 (depends on 11)

The acquisition module according to claim 11, wherein the sampling frequency fe is below 20 kHz, preferably, comprised between 100 Hz and 1000 Hz, further preferably, comprised between 300 Hz and 500 Hz.

### Claim 14 (depends on 11)

The acquisition module according to claim 11, comprising a plurality of analog bandpass filters each having a cut-off frequency, the analog bandpass filters being positioned between the measurement sensor and the sample and hold device.

### Claim 15 (depends on 14)

The acquisition module according to claim 14, wherein the analog bandpass filters are mounted in parallel with each other.

### Claim 16 (depends on 11)

The acquisition module according to claim 11, comprising an analog-digital converter configured to transform the samples of the sample and hold device into digital samples x[nΔt].

### Claim 17 (depends on 11)

A monitoring system comprising the acquisition module according to claim 11 and at least one processing module configured to compute at least one health estimator from the samples and sampling times tn obtained from said acquisition module.

### Claim 18 (depends on 17)

The monitoring system according to claim 17, wherein the processing module comprises a device for transforming the samples according to a Dirichlet transform.

### Claim 19 (depends on 11)

An aircraft comprising an aircraft engine and the acquisition module according to claim 11 of which the measurement sensor is positioned on a part of the aircraft engine.

### Claim 20 (depends on 11)

A method for monitoring a rotating machine, in particular an aircraft engine, by use of the acquisition module according to claim 11, the method comprising:
a step of measuring an analog measurement signal x(t) of a physical quantity of a part of the rotating machine
a step of sampling the analog signal x(t) at sampling times tn defined according to the following law
tn=nΔt+τn
in which
n is a natural integer
Δt=1/fe where fe is the sampling frequency of the sample and hold device
τn is a random variable having a uniform probability law over
[
-
Δ
t
2

;
+
Δ
t
2
]
.
a step of recording the samples and the sampling times tn