Testing equipment of onboard air conditioning system and a method of testing the same

• US 10,156,494 B2
• Filed: 12/02/2015
• Issued: 12/18/2018
• Est. Priority Date: 12/02/2014
• Status: Active Grant

• Current Assignee: Air China Limited
• Original Assignee: Air China Limited
• Inventors: Li, Qixiang
• Primary Examiner(s): Shah, Manish S
• Assistant Examiner(s): MILLER, ROSE MARY
• Application Number:
  US14/957,159
• Publication Number:
  US 20160157034A1
• Time in Patent Office: 1,112 Days
• Field of Search: 73658, 73659, 73661, 73593
• CPC Class Codes: B64D 13/00 Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space , or structural parts of the aircraft treatment rooms with artificial climate for medical purposes A61G10/02; respiratory apparatus in general A62B; for vehicles in general B60H
• CPC Class Codes: B64F 5/60 Testing or inspecting aircraft components or systems
• CPC Class Codes: F24F 13/24 Means for preventing or suppressing noise
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01M 17/00 Testing of vehicles testing fluid tightness G01M3/00; testing elastic properties of bodies or chassis, e.g. torsion-testing, G01M5/00; testing alignment of vehicle headlight devices G01M11/06; testing of engines G01M15/00
• CPC Class Codes: G01M 7/00 Vibration-testing of structures; Shock-testing of structures G01M9/00 takes precedence
• CPC Class Codes: G01M 7/025 Measuring arrangements
• CPC Class Codes: G01M 99/008 by doing functionality tests
• CPC Class Codes: G01N 29/14 using acoustic emission techniques echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00
• CPC Class Codes: G01N 29/4427 with stored values, e.g. threshold values
• CPC Class Codes: G01N 29/46 by spectral analysis, e.g. Fourier analysis or wavelet analysis spectral signal processing per se G06F17/14

Abstract

A testing equipment of an airplane air conditioning system is disclosed. The test equipment includes a sound receiver and a sound processor. The sound processor processes running noise of airplane air conditioning system sampled by the sound receiver to assess the operative condition of the system. The sound receiver samples environmental noise when the airplane air conditioning system is not running, and the sound processor de-noises the running noise by using the environmental noise.

Claims

1. A testing equipment of an airplane air conditioning system, comprising:

a sound receiver, and

a sound processor, wherein the sound processor processes running noise of the airplane air conditioning system sampled by the sound receiver to assess the operative condition of the system,

wherein the sound receiver samples environmental noise when the airplane air conditioning system is not running, and wherein the sound processor de-noises the running noise by using the environmental noise; and

the sound processor assesses whether the plurality of devices are in a deterioration period by analyzing changes in variation trends of waveforms and/or frequency spectrums of the running noises of the plurality of devices in the airplane air conditioning system.

2. The testing equipment according to claim 1, wherein the sound receiver is an independent microphone or a built-in microphone.

3. The testing equipment according to claim 1, wherein the sound receiver is mounted at the air outlet of the airplane air conditioning system or in the cabin.

4. The testing equipment according to claim 1, wherein the sound processor determines a change in the running noise by comparing the running noise with a standard noise of the airplane air conditioning system.

5. The testing equipment according to claim 1, wherein the sound processor assesses a failure source of the airplane air conditioning system.

6. The testing equipment according to claim 5, wherein the sound processor assesses a failure cause of the airplane air conditioning system.

7. The testing equipment according to claim 5, wherein the sound processor analyzes a waveform and/or frequency spectrum of the running noise of the airplane air conditioning system, and extracts waveforms and/or frequency spectrums of noises corresponding to a plurality of devices in the airplane air conditioning system.

8. The testing equipment according to claim 7, wherein the sound processor determines the failure source or failure cause by a combined use of the waveforms and/or frequency spectrums of noises of the plurality of devices.

9. The testing equipment according to claim 1, wherein the sound processor analyzes changes in variation trends of waveforms and/or frequency spectrums of the running noises of the plurality of devices in the airplane air conditioning system by comparing the running noise with history noises of the airplane air conditioning system.

10. The testing equipment according to claim 1, wherein the sound processor assesses a time of failure of the plurality of devices.

11. A method of testing the airplane air conditioning system, comprising:

sampling a running noise of the airplane air conditioning system,

sampling an environmental noise when the airplane air conditioning system is not running;

denoising the running noise by using the environmental noise;

assessing an operative condition of the airplane air conditioning system; and

assessing whether the plurality of devices are in a deterioration period by analyzing changes in variation trends of waveforms and/or frequency spectrums of the running noises of the plurality of devices in the airplane air conditioning system.

12. The method according to claim 11, further comprises determining a change in the running noise by comparing the running noise with the standard noise of the airplane air conditioning system.

13. The method according to claim 11, further comprises assessing a failure source of the airplane air conditioning system.

14. The method according to claim 11, further comprises assessing a failure cause of the airplane air conditioning system.

15. The method according to claim 11, further comprises analyzing waveform and/or frequency spectrum of the running noise of the airplane air conditioning system, and extracting the waveforms and/or frequency spectrums of noises corresponding to a plurality of devices in the airplane air conditioning system.

16. The method according to claim 11, further comprises determining a failure source or failure cause by a combined use of waveforms and/or frequency spectrums of noises of a plurality of devices.

17. The method according to claim 11, wherein analyzing changes in variation trends of waveforms and/or frequency spectrums of the running noises of the plurality of devices in the airplane air conditioning system comprises analyzing changes in variation trends of waveforms and/or frequency spectrums of the running noises of the plurality of devices in the airplane air conditioning system by comparing the running noise with history noises of the airplane air conditioning system.

18. The method according to claim 11, further comprises assessing a time of failure of the plurality of devices.