CN114374790A - High-precision synchronization method for test data and images of aerospace engine - Google Patents
High-precision synchronization method for test data and images of aerospace engine Download PDFInfo
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- CN114374790A CN114374790A CN202111358471.6A CN202111358471A CN114374790A CN 114374790 A CN114374790 A CN 114374790A CN 202111358471 A CN202111358471 A CN 202111358471A CN 114374790 A CN114374790 A CN 114374790A
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- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims description 15
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000007405 data analysis Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
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- 230000002411 adverse Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
- H04N25/77—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components
- H04N25/772—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components comprising A/D, V/T, V/F, I/T or I/F converters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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Abstract
The invention discloses a method for realizing high-precision synchronization of test data and images of an aerospace engine, which is characterized in that a starting signal of a test system is accessed into a synchronous trigger module to provide a high-precision synchronous trigger signal for conventional sensor data and camera image information, after the sensor data and the image information are transmitted into a computer, system software processes the data and the images, a uniform time mark is added to ensure that the time axes of the image information and the sensor data are accurately aligned, and the problems of low frame rate and inaccurate synchronization of a common camera on a test site are solved, so that the running state in an engine test is accurately evaluated and analyzed.
Description
Technical Field
The invention relates to the field of test of aerospace engines.
Background
With the improvement of the analysis demand of the engine test data in the aerospace field, the evaluation of the working state of the engine according to the test video image gradually becomes one of the important means of the comprehensive analysis of the test data. However, if the time synchronization between the video image and the acquired data cannot be ensured, the accurate corresponding relationship between the sensor data and the image cannot be established, especially, the fault of the space engine often has the characteristics of fast development, large destructiveness and the like, and the identification of the state can be adversely affected by a slight time error. In the current aerospace engine test, a common camera is usually adopted for video recording, the common frame rate is 25 frames, and the performance is obviously insufficient when the running state of the engine is carefully observed; however, high-speed camera equipment can be adopted under special requirements, but the data volume is huge, the storage time is usually limited, and under the condition that abnormality is not expected, the instantaneous state of a problem is generally difficult to record, the ignition time is required to be manually recorded in the inherent image acquisition mode, and the data measured by a standard sensor is edited by an operator in the later period, so that the accurate synchronization of the image and the sensor data cannot be realized. Therefore, there is a need to establish an efficient method to ensure accurate synchronization of the test data with the image.
Disclosure of Invention
The invention aims to provide a method capable of realizing high-precision synchronization of test data and images of an aerospace engine, wherein a starting signal of a test system is accessed to a synchronous trigger module to provide a high-precision synchronous trigger signal for conventional sensor data and camera image information, after the sensor data and the image information are transmitted into a computer, system software is used for processing the data and the images, a uniform time mark is added to ensure that the time axes of the image information and the sensor data are accurately aligned, and the problems of low frame rate and inaccurate synchronization of a common camera on a test site are solved, so that the running state in an engine test is accurately evaluated and analyzed.
According to the high-precision synchronization method for the test data and the images of the space engine, a high-frame-rate industrial camera, an acquisition system starting signal, a sensor data acquisition board card, a synchronous trigger module and a computer are required to be adopted to build an image acquisition system in the implementation process. The starting signal of the acquisition system provides trigger pulse and time zero for the acquisition of conventional sensors such as temperature, pressure, vibration and the like, and in the traditional steady-state and dynamic acquisition systems for the aerospace engine test, the starting signal is used as a trigger mark to start the acquisition and storage of test data, and the data is transmitted to a computer through a data acquisition board card so as to ensure the synchronous requirements of various test data. In the invention, the secondary development is carried out on the high frame rate industrial camera, the control logic of the high frame rate industrial camera and a computer software interface is solved, the triggering mode is set to be an external triggering mode, the synchronous triggering module provides a triggering pulse signal of high frame rate sampling for the high frame rate industrial camera, and the camera transmits the image to the computer through the usb3.0 interface after acquiring the image. Considering that the internal clocks of all the acquisition systems are possibly inconsistent, in order to achieve high-precision data synchronization, a unified high-precision timer is provided for sensor data and image acquisition through the synchronous trigger module so as to output accurate control signals and provide accurate time trigger signals for multi-element data acquisition. The same time axis information is created for the sensor data acquisition and the image acquisition in the computer software, the time axis of the sensor data is established simply, and the time stamp is stored as a file name for the image information after the software processing, so that the image and the engine running state can be accurately positioned during the data analysis after the test.
The invention has the beneficial effects that:
aiming at the problem of low synchronization precision of test data and image information of the space engine, the invention provides a multivariate data synchronous acquisition method, which provides a uniform trigger clock for a sensor data acquisition system and an image acquisition system, ensures that time axes of different data can be accurately aligned, provides accurate reference for data analysis after test, and provides reliable basis for evaluation of the running state of the space engine and positioning of instantaneous faults.
Drawings
FIG. 1 is a schematic diagram of a high-precision synchronization method of test data and images of an aerospace engine according to the invention;
FIG. 2 is a block diagram of a synchronization trigger module according to the present invention;
FIG. 3 is a schematic circuit diagram of a synchronous triggering module according to the present invention;
fig. 4 is a schematic diagram of a modular structure of computer software according to the present invention.
The industrial high-frame-rate camera 1, the synchronous trigger module 2, the test system starting signal 3, the sensor 4, the data acquisition board card 5, the computer 6, the upper shell 7 of the synchronous trigger module, the synchronous trigger module circuit 8, the lower shell 9 of the synchronous trigger module, the LED display screen 10, the temperature compensation module 11, the indicator lamp 12, the starting signal input interface 13, the trigger signal output interface 14, the photoelectric coupling module 15, the controller 16, the usb drive module 17, the power module 18 and the usb interface 19.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The schematic diagram of the high-precision synchronization method of the test data and the images of the space engine is shown in fig. 1 and comprises an industrial high frame rate camera (1), a synchronous trigger module (2), a test system starting signal (3), a sensor (4), a data acquisition board card (5), a computer (6) and the like. The starting signal (3) of the test system is provided by a space engine test system, is used as a zero trigger mark for acquiring sensor data and image information, is used for ensuring the synchronous acquisition of multivariate data, and uses a 5V rising edge level in the invention. The industrial high frame rate camera (1) is responsible for collecting image information, and in order to ensure the control of the sampling function of the industrial high frame rate camera, the trigger mode is configured to be external edge trigger. The synchronous trigger module (2) has the function that after the test system starting signal (3) is received, the frequency of the output pulse signal is set according to the requirement of the sampling rate of the system, and the sampling rate of 200-1000 Hz can be realized. The sensors (4) refer to sensors used by conventional measurement means such as temperature, pressure, flow and vibration of a test system, data acquired by the sensors are transmitted to a computer (6) through a data acquisition board card (5) for processing, storing and analyzing, and the actual data acquisition board card can be generally subdivided into a dynamic acquisition board card and a steady-state acquisition board card. Software operated by the computer (6) establishes a uniform time axis for sensor data and image information, and high-precision time synchronization is realized. In addition, the camera (1) of the invention adopts two acquisition modes: recording image data according to the frequency of 25 frames before test ignition; when a test system starting signal (3) starts a test, a synchronous triggering module (2) outputs a triggering pulse signal and simultaneously gives a starting mark to a computer (6) to know the started test process, the computer creates an independent folder for storing image information at the moment and is used for distinguishing data in a non-test section, and meanwhile, an ignition time scale is used as a time stamp to identify the file name of the image and perform high-speed acquisition at a set sampling frequency.
Fig. 2 is a structural diagram of the synchronous trigger module according to the present invention, which is composed of three parts, namely, an upper case (7) of the synchronous trigger module, a circuit (8) of the synchronous trigger module, and a lower case (9) of the synchronous trigger module, wherein the three parts (7) and (9) are manufactured by 3D printing and are used for protecting and packaging the circuit (8). The schematic diagram of the synchronous trigger module circuit (8) is shown in fig. 3, and an LED display screen (10) is used for displaying the trigger state, the trigger frequency and the trigger duration in real time; the temperature compensation module (11) is realized by adopting a temperature compensation crystal oscillator and a peripheral circuit thereof, and provides a high-precision clock signal for the controller (16), and the temperature compensation crystal oscillator with the precision of 0.5ppm is adopted in the invention, so as to ensure that the error does not exceed 5ms in the sampling time of 2000 s; the indicator lamp (12) comprises three states of power supply indication, trigger indication and non-trigger indication; the starting signal input interface (13) is used for connecting a starting signal (3) of the test system, and the trigger signal output interface (14) is used for providing a unified pulse sampling clock for the camera (1) and the data acquisition board card (5); the photoelectric coupling module (15) isolates the synchronous trigger module (2) from the test system starting signal (3) to avoid interference influence between the synchronous trigger module and the test system starting signal; the usb driving module (17) provides level adaptation for establishing communication between the synchronous triggering module (2) and the computer (6), and is physically connected through the usb interface (19), and in addition, the usb interface (19) and the power supply module (18) also provide power for the synchronous triggering module (2).
The schematic diagram of the modular structure of the computer software is shown in fig. 4, the synchronous trigger mode selection is to set the sampling mode of the test system, the first mode adopts the rising edge and the falling edge of the start signal (3) of the test system as the start and end collecting marks, and the second mode adopts the computer (6) to send the start and end instructions to the synchronous trigger module (2) as the marks. After the synchronous trigger module (2) generates a synchronous trigger signal, the system collects data and images according to a specified sampling rate and provides uniform time stamps for software for storing the data and the images; the data and the images with the same time stamp can be displayed accurately and synchronously during playback, and a reliable reference basis is provided for analysis of the engine running state.
Claims (6)
1. The high-precision synchronization method for the test data and the images of the aerospace engine is realized through an industrial high frame rate camera (1), a synchronous trigger module (2), a test system starting signal (3), a sensor (4), a data acquisition board card (5), a computer (6) and the like.
2. The synchronous trigger module (2) has the function that after the test system starting signal (3) is received, the frequency of the output pulse signal is set according to the requirement of the sampling rate of the system, and the sampling rate of 200-1000 Hz can be realized.
3. Software operated by the computer (6) establishes a uniform time axis for sensor data and image information, and high-precision time synchronization is realized. The camera (1) adopts two acquisition modes: recording image data according to the frequency of 25 frames before test ignition; when a test system starting signal (3) starts a test, a synchronous triggering module (2) outputs a triggering pulse signal and simultaneously gives a starting mark to a computer (6) to know the started test process, the computer creates an independent folder for storing image information at the moment and is used for distinguishing data in a non-test section, and meanwhile, an ignition time scale is used as a time stamp to identify the file name of the image and perform high-speed acquisition at a set sampling frequency.
4. The temperature compensation module (11) of the synchronous trigger module circuit (8) is realized by adopting a temperature compensation crystal oscillator and a peripheral circuit thereof, and in order to provide a high-precision clock signal, the temperature compensation crystal oscillator with the precision of 0.5ppm is adopted to ensure that the error is not more than 5ms within 2000s of sampling time; the photoelectric coupling module (15) isolates the synchronous trigger module (2) from the test system starting signal (3) to avoid interference influence between the synchronous trigger module and the test system starting signal;
5. the computer software has a synchronous trigger mode selection function, the synchronous trigger mode selection is to set a sampling mode of the test system, the first mode adopts the rising edge and the falling edge of the start signal (3) of the test system as start and end collecting marks, and the second mode adopts the computer (6) to send start and end instructions to the synchronous trigger module (2) as marks.
6. After the synchronous trigger module (2) generates a synchronous trigger signal, the system collects data and images according to a specified sampling rate and provides uniform time stamps for software for storing the data and the images; the data and the images with the same time stamp can be displayed accurately and synchronously during playback, and a reliable reference basis is provided for analysis of the engine running state.
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2021
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Patent Citations (9)
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| CN106165394A (en) * | 2014-04-10 | 2016-11-23 | 株式会社岛津制作所 | camera control device |
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