Acquisition module for a system for monitoring a rotating machine, monitoring system and method

Patent metadata

Field	Value
Publication number	US-11280701-B2
Application number	US-201917045690-A
Country	US
Kind code	B2
Filing date	Apr 2, 2019
Priority date	Apr 9, 2018
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

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.

First claim

The invention claimed is:

1. An acquisition module for a system for monitoring a rotating machine, 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 t n and to maintain the sample constant between two sampling times t n ,
at least one memory for storing samples
wherein the sample and hold device is configured to collect a sample of the analog 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

in which,
n is a natural integer,
Δ t =1/f e where f e is the sampling frequency of the sample and hold device,
τ n is a random variable having a uniform probability law over

[

-

Δ
t

2

⁢

;

+

Δ
t

2

]

,

wherein the samples and the sampling times t n being stored in the at least one memory.

2. The acquisition module according to claim 1 , comprising at least one analog bandpass filter having a cut-off frequency f cut , the analog bandpass filter being positioned between the measurement sensor and the sample and hold device.

3. The acquisition module according to claim 1 , wherein the sampling frequency f e is below 20 kHz.

4. The acquisition module according to claim 1 , comprising an analog-digital converter configured to transform the samples of the sample and hold device into digital samples x[nΔ t ].

5. An aircraft comprising an aircraft engine and the acquisition module according to claim 1 of which the measurement sensor is positioned on a part of the aircraft engine.

6. A method for monitoring a rotating machine by use of the acquisition module according to claim 1 , 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 t n defined according to the following law:
t n =nΔ t +τ n

in which,
n is a natural integer,
Δ t =1/f e where f e is the sampling frequency of the sample and hold device
τ n 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 t n .

7. The acquisition module according to claim 1 , 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.

8. The acquisition module according to claim 7 , wherein the analog bandpass filters are mounted in parallel with each other.

9. A monitoring system comprising the acquisition module according to claim 1 and at least one processing module configured to compute at least one health estimator from the samples and sampling times t n obtained from said acquisition module.

10. The monitoring system according to claim 9 , wherein the processing module comprises a device for transforming the samples according to a Dirichlet transform.

Assignees

• Safran

Inventors

• Abboud Dany
• El Badaoui Mohamed

Classifications

• H03M1/128 Primary

  at random intervals, e.g. digital alias free signal processing [DASP] · CPC title

• G01M15/14 Primary

  Testing gas-turbine engines or jet-propulsion engines · CPC title

• G01M15/02

  Details or accessories of testing apparatus · CPC title