TEST APPARATUS AND TEST METHOD BASED ON DFDAU

• US 20140350780A1
• Filed: 05/21/2014
• Published: 11/27/2014
• Est. Priority Date: 05/22/2013
• Status: Active Grant

• Current Assignee: Air China Limited
• Original Assignee: Air China Limited
• Inventors: CHAI, Weixi, ZHONG, Dechao, WU, Xueliang, Li, Tang, Li, Yuanbin, Li, Qixiang, Ouyang, Chengli, Bi, Wenjing
• Granted Patent: US 9,639,997 B2
• Time in Patent Office: Days
• US Class Current: 701/32.8
• CPC Class Codes: B64D 45/00 Aircraft indicators or protectors not otherwise provided for camouflage F41H3/00
• CPC Class Codes: G05B 19/0425 Safety, monitoring
• CPC Class Codes: G05B 23/0256 injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
• CPC Class Codes: G05D 1/0055 with safety arrangements
• CPC Class Codes: G07C 5/0816 Indicating performance data, e.g. occurrence of a malfunction
• CPC Class Codes: H04B 3/46 Monitoring; Testing

Abstract

The present invention relates to a test apparatus based on DFDAU (Digital Flight Data Acquisition Unit), comprising: a simulation signal generation portion; and a test portion; wherein, the simulation signal generation portion comprises: an input interface, which receives test data; a simulation signal generation module, which generates simulation signal according to the test data; and an output interface, which is adaptive to be connected to one end of one or more signal transmission device to be tested and output the simulation signal; wherein, the test portion comprises: wiring extension apparatus, which is used to form a gating wiring apparatus and is adaptive to be connected to the other end of the one or more signal transmission devices to be tested, and receive the simulation signal passing through the one or more signal transmission devices to be tested; DFDAU, which is adaptive to receive simulation signal from the wiring extension device, and obtain the transmitted test data; a comparison module, which is adaptive to compare the test data and the transmitted test data.

Claims

1. A test apparatus based on DFDAU (Digital Flight Data Acquisition Unit, comprising:

a signal simulation portion; and

a test portion;

wherein the signal simulation portion comprises;

an input interface, which receives test data;

a simulation signal generation module, which generates simulation signal according to the test data; and

an output interface, which is adaptive to be connected to one end of one or more signal transmission devices to be tested and output the simulation signal;

wherein, the test portion comprises;

a wiring extension apparatus, which is used to form a gating wiring apparatus, and is adaptive to be connected to the other end of the one or more signal transmission devices to be tested, and receives the simulation signal passing through the one or more signal transmission devices to be tested;

DFDAU, which is adaptive to receive simulation signal from the wiring extension device and obtain transmitted test data;

a comparison module, which is adaptive to compare the test data and transmitted test data.

2. The apparatus of claim 1, wherein the test data comprise data of aircraft condition composed according to aviation communication criterion or control command data.

3. The apparatus of claim 1, wherein the test data comprise data of aircraft condition from QAR (Quick Access Recorder) or control command data.

4. The apparatus of claim 2, wherein the DFDAU converts and simulation signal from the wiring extension device into data of aircraft condition or control command data and broadcasts the data of aircraft condition or control command data;

wherein the comparison module compares the test data and data of aircraft condition or control command data broadcast by DFDAU.

5. The apparatus of claim 2, wherein the DFDAU converts simulation signal from the wiring extension device into data of aircraft condition or control command data, and generates a message relating to aircraft signal transmission device to be tested according to message trigger logic;

wherein the comparison module compares the test data and data of aircraft condition or control command data in the message relating to the aircraft signal transmission device to be tested.

6. The apparatus of claim 1, wherein simulation signal generation module comprises a discrete signal generation unit, a voltage signal generation unit, an analog signal generation unit and/or a bus signal generation unit;

wherein the input interface is connected to each discrete signal generation unit, voltage signal generation unit, analog signal generation unit and/or bus signal generation unit via a bus system.

7. The apparatus of claim 6, where the discrete signal generation unit comprises an on/off signal generation unit.

8. The apparatus of claim 7, wherein the on/off signal generation unit comprises a relay array or switch array.

9. The apparatus of claim 6, wherein the analog signal generation unit comprises an alternating current voltage ratio (ACVR) generation unit, the ACVR signal generation unit comprises:

an alternating current voltage signal conversion unit, which is adaptive to be connected to a power source and generate an alternating current voltage signal with valid value and frequency;

a digital signal subcircuit, which is adaptive to receive digital signal;

a modulator, which is adaptive to receive the alternating current voltage signal and the digital signal and generate an alternating current voltage ratio signal according to the digital signal; and

an output transformer, which is adaptive to output the alternating current voltage ratio signal.

10. The apparatus of claim 9, wherein the digital signal subcircuit comprises:

a bus adapter, which is connected to the bus system to receive digital signal from the bus system;

a bus driving circuit, which is used to drive the digital signal; and

a electric level conversion circuit, which converts electric level of the digital signal into a electric level required by the modulator.

11. The apparatus of claim 9, wherein the modulator modulates valid value of the alternating current voltage signal according to digital signal input from the digital signal subcircuit so as to generate a corresponding alternating current voltage ratio signal.

12. The apparatus of claim 6, wherein the analog signal generation unit comprises a sync signal generation unit, the sync signal generation unit comprises:

an alternating current voltage signal conversion unit, which is adaptive to be connected to a power source and generate two sets of alternating current voltage signals;

a digital signal subcircuit, which is adaptive to receive input digital signal;

a modulator, which is adaptive to convert the two sets of alternating current voltage signals into two sets of alternating current voltage signals having phase difference, wherein the phase difference is based on the digital signal;

a first and second amplifiers, which are adaptive to amplify power of the two sets of alternating current voltage signals having phase difference; and

an output transformer, which is adaptive to output the amplified two sets of alternating current voltage signals having phase difference.

13. The apparatus of claim 6, wherein the modulator comprises:

sin multiplier and cos multiplier;

wherein, the two sets of alternating current voltage signals enter into the sin multiplier and the cos multiplier respectively and are converted into two sets of alternating current voltage signals having the phase difference.

14. The apparatus of claim 6, wherein the bus signal generation unit comprises an ARINC429 bus signal generation unit, an ARINC629 bus signal generation unit or a combination thereof.

15. The apparatus of claim 6 further comprises a signal conditioning adapter, which is adaptive to manipulate simulation signal generated by the signal generation module.

16. The apparatus of claim 6 further comprises a wiring extension device, which is adaptive to form a gating wiring apparatus.

17. The apparatus of claim 16, the wiring extension device comprises a wiring board, the wiring board comprises:

a wiring board panel, which comprises a plurality of sockets, each socket capable of being communicatively connected to one output signal of the simulation signal generation module; and

a plurality of output interfaces, wherein each output interface comprises a plurality of output terminals, each output terminal corresponding to one socket of the wiring board panel;

wherein according to the type of output interface, each output interface is connected to a corresponding type of input interface of the DFDAU.

18. The apparatus of claim 17, the wiring board panel comprises:

an analog signal zone, a bus signal zone, a power connection zone and a ground connection zone.

19. The apparatus of claim 17, the wiring board comprises an automatic switchover module, which is adaptive to automatically switch between each input signal of the wiring board panel and each output terminal of the plurality of output interfaces.

20. The apparatus of claim 16, wherein the wiring extension device comprises an input interface and an output interface;

the input interface comprises a plurality of input terminals, each input terminal capable of being communicatively connected to one output signal of the simulation signal generation module;

the output interface comprise a plurality of output terminals, each output terminal corresponding to one socket of the wiring board panel;

the wiring extension device comprises an automatic switchover module, which is adaptive to automatically switch between each input terminal of the input interface and each output terminal of the plurality of output interfaces.

21. The apparatus of claim 19, wherein the automatic switchover module comprises a switch array arranged in rows and columns.

22. The apparatus of claim 16, wherein the wiring extension device comprises:

a test module, which examines whether a connection is invalid through measuring current and voltage of the connection; and

a circuit scanning module, which is adaptive to automatically switch between each connection so as to connect the test module to different connections.

23. A method for testing an aircraft signal transmission device, comprising:

connecting one end of one or more signal transmission devices to be tested to output interface of the simulation signal generation portion of the apparatus of claim 1, connecting the other end of one or more signal transmission devices to wiring extension device of the test portion of the apparatus of claim 1;

loading test data into the apparatus of claim 1;

generating simulation signal according to the test data;

receiving simulation signal from the wiring extension device;

comparing the test data from input to input interface and test data based on simulation signal from the wiring extension device.

24. The method of claim 23, wherein the test data comprise data of aircraft condition or control command data composed according to aviation communication criterion.

25. The method of claim 23, wherein the test data comprise data of aircraft condition or control command data from aircraft QAR (Quick Access Recorder).

26. The method of claim 24, wherein the DFDAU converts simulation signal from the wiring extension device into data of aircraft condition or control command data and broadcasts the data of aircraft condition or control command data;

wherein the comparison step comprises;

comparing the test data from input to input interface and data of aircraft condition or control command data broadcast by DFDAU.

27. The method of claim 23 further comprises:

wherein the DFDAU converts simulation signal from the wiring extension device into data of aircraft condition or control command data, and generates a message relating to aircraft signal transmission device to be tested according to message trigger logic;

wherein the comparison step comprises comparing the test data from input to input interface and data of aircraft condition or control command data in the message relating to the aircraft signal transmission device to be tested.

28. A test apparatus of aircraft DFDAU, comprises:

an input interface, which receives test data;

a simulation signal generation module, which generates simulation signal according to the test data;

a wiring extension device, which is used to form a gating wiring apparatus, wherein the simulation signal enters into DFDAU to be tested via the wiring extension apparatus; and

a comparison module, which compares test data based on the simulation signal from the DFDAU to be tested and test data from input to the input interface.

29. The apparatus of claim 28, wherein the data of aircraft condition or control command data comprise data of aircraft condition or control command data composed according to aviation communication criterion.

30. The apparatus of claim 28, wherein the data of aircraft condition or control command data comprise data of aircraft condition or control command data from aircraft QAR (Quick Access Recorder).

31. The apparatus of claim 29, wherein the comparison module compares whether test data based on the simulation signal broadcast by the DFDAU to be tested are the same with test data from input to the input interface, and outputs inconsistent data of aircraft condition or control command data.

32. The apparatus of claim 28, wherein the comparison module compares test data based on the simulation signal in the message generated by the DFDAU to be tested and test data from input to the input interface.

33. A method for testing DFDAU to be tested on the aircraft DFDAU test apparatus of claim 28, comprising:

loading test data onto the test apparatus;

generating simulation signal according to the test data;

connecting the simulation signal into wiring extension device;

receiving simulation signal from the wiring extension device, and connecting the simulation signal into DFDAU to be tested; and

comparing test data based on the simulation signal from the DFDAU to be tested and test data loaded into the test apparatus.