Aircraft bomb rack maintenance detection device

Abstract

The present application relates to a kind of aircraft bomb rack maintenance detection device, in combination with ultrasonic heating, infrared detection technology, realize the ultrasonic detection of aircraft bomb rack mounting plate without disassembly, aircraft bomb rack can be directly detected after being removed as a whole, even can be directly mounted on aircraft and directly detected;More accurate, more efficient;In combination with ultrasonic sweep technology, realize the non-contact detection of hook rack, utilize mounting plate to transmit ultrasonic wave to hook rack, without direct contact with hook rack, without disassembly can realize accurate detection of hook rack, more safe and convenient.Combined with model classification technology, realize the defect detection and classification of hook rack, suitable for various different positions, the damage of type hook rack, high detection accuracy, fast;Detection analysis module is installed in host computer, on the one hand, software upgrade is more convenient, while the configuration requirement of device used in field is lower, and the security is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aircraft detection, in particular to a kind of aircraft bomb rack maintenance detection device. BACKGROUND

[0002] In order to adapt to the needs of combat, aircraft is provided with the device specially used for bomb release: bomb rack, bomb rack has two hooks like hooks, and the bomb is firmly hooked, installed in the belly of aircraft, on the aircraft or under the wing.

[0003] The state of bomb rack is directly related to whether bomb can be accurately launched, so it needs to be detected when maintaining, to ensure healthy working condition.In the prior art, it is generally detected by continuously starting and closing bomb rack and visually detecting;This detection method is not accurate and cannot find hidden defects, such as microcracks in bomb rack;The acceleration of aircraft is very large when flying at high altitude, and slight cracks can easily cause bomb rack to fail, and the consequences are unpredictable once abnormality occurs.

[0004] Based on this, a kind of aircraft bomb rack maintenance detection device is designed. SUMMARY

[0005] In order to solve the above problems, the present application provides a kind of aircraft bomb rack maintenance detection device, including detection installation box and detection system.

[0006] Detection system includes host computer, detection controller, memory, frequency sweeper, ultrasonic transmitter, ultrasonic receiver, infrared thermal imager, gas heater;

[0007] Detection controller is wirelessly or wiredly connected to host computer, and sends the data detected to host computer;Detection data is analyzed in host computer;

[0008] Frequency sweeper is connected to detection controller, and the other end of frequency sweeper is connected to ultrasonic transmitter, which emits sweep frequency ultrasonic wave under the control of frequency sweeper;

[0009] Ultrasonic receiver is connected to detection controller, and ultrasonic receiver receives ultrasonic wave and sends it to detection controller;

[0010] Infrared thermal imager is connected to detection controller, and infrared thermal imager is used for thermal imaging of aircraft bomb rack in detection installation box;

[0011] Gas heater is connected to detection controller, and gas heater is arranged on detection installation box, for controlling the temperature of gas inside detection installation box, while ensuring that the temperature inside detection installation box is uniform.

[0012] Detection installation box includes transparent shell, and the inside of transparent shell forms airtight rectangular space.

[0013] The gas inlet and the gas outlet are arranged on two sides of the transparent shell respectively, and the gas heater is arranged outside the rectangular space formed by the transparent shell;

[0014] The gas inlet valve is arranged at the downstream of the airflow of the gas heater.

[0015] The ultrasonic transmitter and the ultrasonic receiver are arranged on the two sides inside the transparent shell, and the elastic coupling member is arranged outside the ultrasonic transmitter and the ultrasonic receiver, and the elastic coupling member is used to couple to the aircraft bomb rack to realize the emission and reception of ultrasonic waves.

[0016] The infrared thermal imager is arranged outside the transparent shell, and the infrared thermal imager performs thermal imaging detection on the appearance of the aircraft bomb rack, obtains the infrared thermal imaging image of the aircraft bomb rack, and sends the infrared thermal imaging image to the detection controller.

[0017] The measured bomb rack includes a first mounting plate, a second mounting plate and a hook rack, the first mounting plate and the second mounting plate are used to mount the hook rack and other accessories, and the hook rack is used to hang bombs, and the hook rack is switched between the mounting state and the release state by moving the hook rack.

[0018] During detection, the entire bomb rack is placed in the detection mounting box, and the elastic coupling member clamps the side surface of the first mounting plate and the second mounting plate from both ends, and the elastic coupling member does not directly contact the hook rack.

[0019] The ultrasonic transmitter has two working modes, namely the fixed-frequency emission mode and the sweep-frequency emission mode.

[0020] In the fixed-frequency emission mode, the ultrasonic transmitter emits ultrasonic waves of a fixed frequency to the bomb rack, and in the sweep-frequency mode, the frequency sweeper drives the ultrasonic transmitter to continuously sweep between 20 kHz and 1 MHz, so that the ultrasonic transmitter continuously emits ultrasonic waves of 20 kHz to 1 MHz frequency; during the sweep, the frequency sweeper feeds back the emitted frequency to the detection controller in real time.

[0021] The ultrasonic waves emitted from the ultrasonic transmitter are received by the ultrasonic receiver after being conducted by the first mounting plate and the second mounting plate.

[0022] The ultrasonic receiver is a multiple-frequency receiver with frequency identification function, and the ultrasonic receiver sends the real-time received ultrasonic frequency spectrum to the detection controller.

[0023] The detection controller controls the aircraft bomb rack detection, including the mounting plate detection mode and the hook rack detection mode.

[0024] In the installation plate detection mode, the gas heater is heated, hot air enters the detection installation box and flows inside the detection installation box; the infrared thermal imager performs thermal imaging on the first installation plate; after the surface temperature of the first installation plate is stable, the heating and gas flow are stopped, and then the ultrasonic transmitter starts the fixed-frequency emission; the infrared thermal imager detects the surface temperature of the first installation plate in real time and sends it to the detection controller; the detection controller sends the acquired infrared thermal imaging image to the upper computer together with the standard image stored in the memory;

[0025] After the detection of the first installation plate is completed, the detection installation box is turned over, the infrared thermal imager is aligned with the second installation plate, and the same method as detecting the first installation plate is used to detect the second installation plate.

[0026] In the hook rack detection mode, the air inside the detection installation box does not flow, and the ultrasonic transmitter starts the sweep frequency emission; the sweep frequency device drives the ultrasonic transmitter to continuously sweep between 20 kHz and 1 MHz, so that the ultrasonic transmitter continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; when sweeping, the sweep frequency device feeds back the emitted frequency to the detection controller in real time;

[0027] The ultrasonic receiver receives ultrasonic waves when the hooks of the bomb rack are in the mounting state and the release state, respectively, and sends the received ultrasonic frequency spectrum to the detection controller in real time;

[0028] The detection controller forms a three-dimensional data cube of the ultrasonic frequency spectrum changing over time, and sends the three-dimensional data cube to the upper computer; the upper computer inputs the data cube into the diagnostic model, and the diagnostic model outputs whether the hook rack has a fault and the type of the fault; the upper computer sends whether the hook rack has a fault and the type of the fault to the detection controller.

[0029] The detection controller is also connected with a display module, which is used to display the working state of the detection device, the images acquired by the infrared thermal imager in real time, the state of communication with the upper computer, and the detection results returned by the upper computer.

[0030] A method for maintaining and detecting the aircraft bomb rack using the aircraft bomb rack maintenance and detection device, comprising the following steps:

[0031] Step 1, bring the maintenance and detection device to the detection site, and install the aircraft bomb rack into the detection installation box, the elastic coupling member clamps the side of the first installation plate and the second installation plate from both ends, and the elastic coupling member does not directly contact the hook rack;

[0032] Step 2, the detection controller sends a detection test signal to the upper computer to determine whether the upper computer and the detection controller are in good connection state; then the upper computer sends a detection instruction to the detection controller to start the installation plate detection;

[0033] Step 3, the detection controller controls the gas heater to heat, hot air enters the detection installation box, the air inlet valve and the air outlet valve are opened, the gas flows in the detection installation box; the infrared thermal imager performs thermal imaging on the first installation plate; after the surface temperature of the first installation plate is stable, heating is stopped, the air inlet valve and the air outlet valve are closed, and the gas flow is stopped; then the ultrasonic transmitter starts the fixed frequency emission, and emits ultrasonic waves with a frequency F1; the infrared thermal imager detects the surface temperature of the first installation plate in real time and sends it to the detection controller; due to the ultrasonic vibration, the surface temperature of the first installation plate changes, and heat accumulates at different positions on the surface of the first installation plate; after the surface temperature of the first installation plate is stable, the detection controller sends the acquired infrared thermal image, i.e. the first detection image, to the upper computer together with the first standard image stored in the memory;

[0034] The upper computer performs grayscale processing and then normalization processing on the first detection image and the first standard image; the upper computer compares the processed first detection image and the first standard image and calculates the comparison result R1; if R1 exceeds the threshold value, it means that the first installation plate surface has defects and needs to be replaced; if R1 does not exceed the threshold value, it means that the first installation plate is qualified;

[0035] Step 4, after the detection of the first installation plate is completed, the aircraft bomb rack is reinstalled in the detection installation box so that the second installation plate can be photographed by the infrared thermal imager; the detection controller controls the gas heater to heat, hot air enters the detection installation box, the air inlet valve and the air outlet valve are opened, the gas flows in the detection installation box; the infrared thermal imager performs thermal imaging on the second installation plate; after the surface temperature of the second installation plate is stable, heating is stopped, the air inlet valve and the air outlet valve are closed, and the gas flow is stopped; then the ultrasonic transmitter starts the fixed frequency emission, and emits ultrasonic waves with a frequency F2; the infrared thermal imager detects the surface temperature of the second installation plate in real time and sends it to the detection controller; due to the ultrasonic vibration, the surface temperature of the second installation plate changes, and heat accumulates at different positions on the surface of the second installation plate; after the surface temperature of the second installation plate is stable, the detection controller sends the acquired infrared thermal image, i.e. the second detection image, to the upper computer together with the second standard image stored in the memory;

[0036] The upper computer performs grayscale processing and then normalization processing on the second detection image and the second standard image; the upper computer compares the processed second detection image and the second standard image and calculates the comparison result R2; if R2 exceeds the threshold value, it means that the first installation plate surface has defects and needs to be replaced; if R2 does not exceed the threshold value, it means that the first installation plate is qualified;

[0037] Step 5, after the installation plate detection is completed, the upper computer sends a detection instruction to the detection controller to start the hook rack detection;

[0038] Close the intake valve and the exhaust valve, detect the air inside the installation box does not flow, the ultrasonic transmitter start sweep emission; sweep frequency drive ultrasonic transmitter between 20 kHz to 1 MHz continuous sweep, so that the ultrasonic transmitter continuously emit 20 kHz to 1 MHz frequency ultrasonic waves; when the sweep, the sweep frequency real-time feedback to the detection controller of the frequency emitted;

[0039] If the hook rack has micro cracks or fracture defects, the ultrasonic waves received from the mounting plate will cause the hook rack defect position to resonate when they reach the rack, and the ultrasonic energy will be consumed, thereby the sound wave energy ultimately transmitted to the ultrasonic receiver will change, so that the vibration spectrum received when there is a defect is different from when it is intact;

[0040] The ultrasonic receiver receives ultrasonic waves in the hook rack of the ammunition rack in the hanging state and the released state, and sends the received ultrasonic spectrum to the detection controller in real time;

[0041] A three-dimensional data cube of the ultrasonic spectrum changing over time is formed in the detection controller, and the three-dimensional data cube is sent to the upper computer; the upper computer inputs the data cube into the diagnostic model, and the diagnostic model outputs whether the hook rack has a fault and the type of fault; the upper computer sends whether the hook rack has a fault and the type of fault to the detection controller.

[0042] The frequency F1 is the ultrasonic resonance frequency of the first mounting plate, and the frequency F2 is the ultrasonic resonance frequency of the second mounting plate; the normalization processing method is to make the sum of the pixel gray values of the detection image equal to the standard image;

[0043] The calculation method of R1 and R2 is:

[0044] The first detection image and the first standard image are differentiated, that is, the image pixels are differentiated, and the gray values of the differentiated pixel results form an array, the variance of the array is calculated, and the variance is denoted as R1; R2 is obtained by the same method of calculating the second detection image and the second standard image;

[0045] The construction method of the diagnostic model is:

[0046] 1) First, the vulnerable positions and types of the hook rack are counted, and standard test pieces with different positions and different types of defects are made after counting; the standard test pieces are subjected to sweep detection in the same environment as the actual detection; each defect is detected multiple times to form an input set; the corresponding defect type and defect position are taken as an output set;

[0047] 2) Use the input set and the output set to construct a diagnostic model, and the construction method is an SVM classification model, a CNN neural network model, or a least squares classification model.

[0048] The beneficial effects of the present application are:

[0049] The present application combines ultrasonic heating and infrared detection technology to realize non-disassembly ultrasonic detection of the aircraft bomb rack mounting plate, which can directly detect the whole aircraft bomb rack after disassembly, or even directly detect the aircraft bomb rack mounted on the aircraft; the detection is more accurate and efficient;

[0050] Combined with ultrasonic sweep technology, non-contact detection of the hook rack is realized, and the ultrasonic wave is transmitted to the hook rack by the mounting plate, without the need for direct contact with the hook rack or disassembly to realize accurate detection of the hook rack, which is safer and more convenient.

[0051] Combined with model classification technology, the defect detection and classification of the hook rack are realized, which is suitable for various hook rack damages in different positions and types, and has high detection accuracy and speed; the detection and analysis module is installed in the host computer, which is convenient for software upgrade, has lower configuration requirements for on-site use of the device, and has better security. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0053] ATTACHMENT Fig. 1 The figure is a schematic diagram of the overall architecture of the present application.

[0054] ATTACHMENT Fig. 2 The figure is a schematic diagram of the first mounting plate, the hook rack and the second mounting plate of the present application.

[0055] ATTACHMENT Fig. 3 The figure is a schematic diagram of the installation of the present application during detection. DETAILED DESCRIPTION

[0056] Embodiment 1:

[0057] Referring to Figs. 1-3 , the present application provides a kind of aircraft bomb rack maintenance detection device, including detection installation box and detection system.

[0058] Detection system includes host computer, detection controller, memory, frequency sweeper, ultrasonic transmitter 1, ultrasonic receiver 2, infrared thermal imager, gas heater 7;

[0059] Detection controller is wirelessly or wiredly connected to host computer, and sends the data detected to host computer;Detection data is analyzed in host computer;

[0060] The frequency sweeper is connected to the detection controller, and the other end of the frequency sweeper is connected to the ultrasonic transmitter 1, which transmits sweep frequency ultrasonic waves under the control of the frequency sweeper;

[0061] The ultrasonic receiver 2 is connected to the detection controller, and the ultrasonic receiver 2 receives ultrasonic waves and sends them to the detection controller;

[0062] The infrared thermal imager is connected to the detection controller, and the infrared thermal imager is used for thermal imaging of the aircraft bomb rack in the detection installation box;

[0063] The gas heater 7 is connected to the detection controller, and the gas heater 7 is arranged on the detection installation box and is used for controlling the gas temperature in the detection installation box while ensuring the uniformity of the temperature in the detection installation box.

[0064] The detection installation box comprises a transparent shell, and a closed rectangular space is formed in the transparent shell;

[0065] Air inlets 3 and air outlets 4 are arranged on both sides of the transparent shell, and the gas heater 7 is arranged outside the rectangular space formed by the transparent shell;

[0066] The air inlet 3 is provided with an air inlet valve 5, and the air outlet 4 is provided with an air outlet valve 6, and the air inlet valve 5 is arranged downstream of the airflow of the gas heater 7;

[0067] The ultrasonic transmitter 1 and the ultrasonic receiver 2 are arranged on both sides of the transparent shell; the ultrasonic transmitter 1 and the ultrasonic receiver 2 are externally provided with elastic couplings, and the elastic couplings are used for coupling to the aircraft bomb rack to realize the emission and reception of ultrasonic waves;

[0068] The infrared thermal imager is arranged outside the transparent shell, and the infrared thermal imager is used for thermal imaging detection of the appearance of the aircraft bomb rack, obtains an infrared thermal imaging image of the aircraft bomb rack, and sends the infrared thermal imaging image to the detection controller.

[0069] The measured bomb rack comprises first and second installation plates and a hook rack, the first and second installation plates are used for installing the hook rack and other accessories, and the hook rack is used for hanging bombs and switching between the hanging state and the release state through the movement of the hook rack;

[0070] During detection, the entire bomb rack is placed in the detection installation box, and the elastic couplings are clamped from the sides of the first and second installation plates, and the elastic couplings do not directly contact the hook rack.

[0071] The ultrasonic transmitter 1 has two working modes, namely a fixed frequency emission mode and a sweep frequency emission mode;

[0072] In the fixed frequency transmission mode, the ultrasonic transmitter 1 emits ultrasonic waves of a fixed frequency to the bomb rack; in the sweep frequency mode, the sweep frequency device drives the ultrasonic transmitter 1 to continuously sweep the frequency between 20 kHz and 1 MHz, so that the ultrasonic transmitter 1 continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; during the sweep frequency, the sweep frequency device feeds back the frequency of the emission to the detection controller in real time;

[0073] The ultrasonic waves emitted from the ultrasonic transmitter 1 are received by the ultrasonic receiver after being conducted through the first mounting plate and the second mounting plate;

[0074] The ultrasonic receiver 2 is a multiple frequency receiver with a frequency identification function, and the ultrasonic receiver 2 sends the real-time received ultrasonic frequency spectrum to the detection controller.

[0075] The detection controller controls the detection of the aircraft bomb rack, including the mounting plate detection mode and the hook rack detection mode.

[0076] In the mounting plate detection mode, the gas heater 7 is heated, hot air enters the detection mounting box and flows inside the detection mounting box; the infrared thermal imager performs thermal imaging on the first mounting plate; after the surface temperature of the first mounting plate is stable, the heating and air flow are stopped, and then the ultrasonic transmitter 1 starts fixed frequency transmission; the infrared thermal imager detects the surface temperature of the first mounting plate in real time and sends it to the detection controller; the detection controller sends the acquired infrared thermal imaging image together with the standard image stored in the memory to the upper computer;

[0077] After the detection of the first mounting plate is completed, the detection mounting box is turned over, the infrared thermal imager is aligned with the second mounting plate, and the same method as detecting the first mounting plate is used to detect the second mounting plate.

[0078] In the hook rack detection mode, the air inside the detection mounting box does not flow, and the ultrasonic transmitter 1 starts sweep frequency transmission; the sweep frequency device drives the ultrasonic transmitter 1 to continuously sweep the frequency between 20 kHz and 1 MHz, so that the ultrasonic transmitter 1 continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; during the sweep frequency, the sweep frequency device feeds back the frequency of the emission to the detection controller in real time;

[0079] The ultrasonic receiver 2 receives ultrasonic waves when the hook rack of the bomb rack is in the mounting state and the release state, respectively, and sends the received ultrasonic frequency spectrum to the detection controller in real time;

[0080] The detection controller forms a three-dimensional data cube of the ultrasonic frequency spectrum changing with time, and sends the three-dimensional data cube to the upper computer; the upper computer inputs the data cube into the diagnostic model, and the diagnostic model outputs whether the hook rack has a fault and the type of the fault; the upper computer sends whether the hook rack has a fault and the type of the fault to the detection controller.

[0081] The detection controller is also connected with a display module, which is used to display the working state of the detection device, the image acquired by the infrared thermal imager in real time, the state of communication with the upper computer and the detection result returned by the upper computer.

[0082] Embodiment 2

[0083] Referring to Figs. 1-3 A method for performing maintenance detection of the aircraft bomb rack by using the aircraft bomb rack maintenance detection device, comprising the following steps:

[0084] Step 1, bring the maintenance detection device to the detection site, and install the aircraft bomb rack into the detection installation box, the elastic coupling member clamps the side surface of the first installation plate and the second installation plate from both ends, and the elastic coupling member does not directly contact the hook rack;

[0085] Step 2, the detection controller sends a detection test signal to the upper computer to determine whether the connection state between the upper computer and the detection controller is good; then the upper computer sends a detection instruction to the detection controller to start the installation plate detection;

[0086] Step 3, the detection controller controls the gas heater 7 to heat, hot air enters the detection installation box, the air inlet valve 5 and the air outlet valve 6 are opened, and the gas flows inside the detection installation box; the infrared thermal imager performs thermal imaging on the first installation plate; after the surface temperature of the first installation plate is stable, stop heating, and close the air inlet valve 5 and the air outlet valve 6, stop the gas flow; then the ultrasonic transmitter 1 starts the fixed frequency emission, and emits ultrasonic waves with frequency F1; the infrared thermal imager detects the surface temperature of the first installation plate in real time and sends it to the detection controller; due to the ultrasonic vibration, the surface temperature of the first installation plate changes, and heat accumulates at different positions on the surface of the first installation plate; after the surface temperature of the first installation plate is stable, the detection controller sends the acquired infrared thermal imaging image, i.e., the first detection image, to the upper computer together with the first standard image stored in the memory;

[0087] The upper computer performs grayscale processing and then normalization processing on the first detection image and the first standard image; the upper computer compares the processed first detection image and the first standard image, and calculates the comparison result R1; if R1 exceeds the threshold value, it means that the surface of the first installation plate has defects and needs to be replaced; if R1 does not exceed the threshold value, it means that the first installation plate is qualified;

[0088] Step 4, after the first mounting plate is detected, the aircraft bomb rack is re-installed in the detection installation box, so that the second mounting plate can be photographed by the infrared thermal imager; the detection controller controls the gas heater 7 to heat, hot air enters the detection installation box, the air inlet valve 5 and the air outlet valve 6 are opened, and the gas flows in the detection installation box; the infrared thermal imager performs thermal imaging on the second mounting plate; after the surface temperature of the second mounting plate is stable, stop heating, and close the air inlet valve 5 and the air outlet valve 6, stop the gas flow; then the ultrasonic transmitter 1 starts the fixed frequency emission, emits ultrasonic waves with frequency F2; the infrared thermal imager detects the surface temperature of the second mounting plate in real time and sends it to the detection controller; due to the ultrasonic vibration, the surface temperature of the second mounting plate changes, and heat accumulates at different positions on the surface of the second mounting plate; after the surface temperature of the second mounting plate is stable, the detection controller sends the acquired infrared thermal image, i.e. the second detection image, to the upper computer together with the second standard image stored in the memory;

[0089] The upper computer performs grayscale processing and then normalization processing on the second detection image and the second standard image; the upper computer compares the processed second detection image and the second standard image, and calculates the comparison result R2, if R2 exceeds the threshold value, it means that the first mounting plate surface has defects and needs to be replaced; if R2 does not exceed the threshold value, it means that the first mounting plate is qualified;

[0090] Step 5, after the mounting plate is detected, the upper computer sends a detection instruction to the detection controller to start the hook rack detection;

[0091] Close the air inlet valve 5 and the air outlet valve 6, the air in the detection installation box does not flow, the ultrasonic transmitter 1 starts the sweep frequency emission; the sweep frequency device drives the ultrasonic transmitter 1 to continuously sweep between 20 kHz and 1 MHz, so that the ultrasonic transmitter 1 continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; during the sweep, the sweep frequency device feeds back the emitted frequency to the detection controller in real time;

[0092] If the hook rack has micro-cracks or fracture defects, the ultrasonic waves received from the mounting plate will cause resonance at the defect position of the hook rack when they reach the hook rack, and the ultrasonic energy will be consumed, so that the sound wave energy finally transmitted to the ultrasonic receiver 2 will change, so that the vibration frequency spectrum received when there is a defect is different from that when it is intact;

[0093] The ultrasonic receiver 2 receives ultrasonic waves in the hook rack of the bomb rack in the mounted state and the released state, and sends the received ultrasonic wave spectrum to the detection controller in real time;

[0094] The three-dimensional data cube of the ultrasonic spectrum changing over time in the detection controller is formed, and the three-dimensional data cube is sent to the upper computer; the upper computer inputs the data cube into a diagnosis model, and the diagnosis model outputs whether the hook rack has a fault and the type of the fault; and the upper computer sends whether the hook rack has a fault and the type of the fault to the detection controller.

[0095] The frequency F1 is the ultrasonic resonance frequency of the first mounting plate, and the frequency F2 is the ultrasonic resonance frequency of the second mounting plate; the normalization processing mode is to make the sum of the pixel gray values of the detection image equal to the standard image;

[0096] The calculation method of R1 and R2 is:

[0097] The first detection image and the first standard image are differentiated, that is, the image pixels are differentiated, and the gray values of the differentiated result pixels form an array, the variance of the array is calculated, and the variance is denoted as R1; R2 is obtained by the same method of calculating the second detection image and the second standard image;

[0098] The construction method of the diagnosis model is:

[0099] 1) First, the vulnerable positions and types of the hook rack are counted, and standard test pieces with different positions and different types of defects are made after counting; the standard test pieces are subjected to frequency sweep detection in the same environment as the actual detection; each defect is detected multiple times to form an input set; and the corresponding defect type and defect position are taken as an output set;

[0100] 2) The input set and the output set are used to construct a diagnosis model, and the construction method is an SVM classification model, a CNN neural network model or a least square classification model.

[0101] The above description of the embodiments is provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but are interchangeable and can be used in selected embodiments, even if not specifically shown or described. In many aspects, the same elements or features can also be changed. Such changes are not considered to be a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

[0102] Example embodiments are provided so as to be thorough and to convey the full scope of the disclosure. Numerous specific details are set forth such as examples of specific components, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. Clearly, the

[0103] terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising," when used in this document, are each taken to mean, in the context of the disclosure, that the method includes the recited feature or step, but not excluding the presence or addition of one or more other features or steps. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described. It is also to be understood that additional or alternative steps can be employed.

Claims

1. A device for maintaining and detecting an aircraft bomb rack, comprising a detection installation box and a detection system, characterized in that: the detection system comprises a host computer, a detection controller, a memory, a frequency sweeper, an ultrasonic transmitter (1), an ultrasonic receiver (2), an infrared thermal imager, and a gas heater (7); the detection controller is wirelessly or wiredly connected to the host computer and sends the detection data to the host computer; the detection data is analyzed in the host computer; the frequency sweeper is connected to the detection controller, and the other end of the frequency sweeper is connected to the ultrasonic transmitter (1); the ultrasonic transmitter (1) emits sweep frequency ultrasonic waves under the control of the frequency sweeper; the ultrasonic receiver (2) is connected to the detection controller, and the ultrasonic receiver (2) receives ultrasonic waves and sends them to the detection controller; the infrared thermal imager is connected to the detection controller, and the infrared thermal imager is used for thermal imaging of the aircraft bomb rack in the detection installation box; the gas heater (7) is connected to the detection controller, and the gas heater (7) is arranged on the detection installation box and is used for controlling the temperature of the gas inside the detection installation box while ensuring that the temperature inside the detection installation box is uniform; the detection installation box comprises a transparent shell, and a closed rectangular space is formed inside the transparent shell; an air inlet (3) and an air outlet (4) are arranged on both sides of the transparent shell, the gas heater (7) is arranged at the air inlet (3) and outside the rectangular space formed by the transparent shell; an air inlet valve (5) is arranged at the air inlet (3), and an air outlet valve (6) is arranged at the air outlet (4); the air inlet valve (5) is arranged downstream of the airflow of the gas heater (7); the ultrasonic transmitter (1) and the ultrasonic receiver (2) are arranged inside the transparent shell; an elastic coupling member is arranged outside the ultrasonic transmitter (1) and the ultrasonic receiver (2), and the elastic coupling member is used for coupling to the aircraft bomb rack to realize the emission and reception of ultrasonic waves; the infrared thermal imager is arranged outside the transparent shell, and the infrared thermal imager is used for thermal imaging detection of the appearance of the aircraft bomb rack, obtains an infrared thermal imaging image of the aircraft bomb rack, and sends the infrared thermal imaging image to the detection controller; the measured bomb rack comprises a first mounting plate, a second mounting plate, and a hook rack; the first mounting plate and the second mounting plate are used for mounting the hook rack and other accessories; the hook rack is used for hanging bombs, and the hook rack is switched between a hanging state and a released state by moving the hook rack; during detection, the entire bomb rack is placed in the detection installation box, and the elastic coupling member clamps the side surfaces of the first mounting plate and the second mounting plate from both ends; the elastic coupling member does not directly contact the hook rack. 2.The device for maintaining and detecting an aircraft bomb rack according to claim 1, characterized in that: the ultrasonic transmitter (1) has two working modes, namely a fixed frequency emission mode and a sweep frequency emission mode; in the fixed frequency emission mode, the ultrasonic transmitter (1) emits ultrasonic waves with a fixed frequency to the bomb rack; in the sweep frequency mode, the frequency sweeper drives the ultrasonic transmitter (1) to continuously sweep between 20 kHz and 1 MHz, so that the ultrasonic transmitter (1) continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; during the sweep, the frequency sweeper feeds back the emitted frequency to the detection controller in real time. The ultrasonic waves emitted from the ultrasonic transmitter (1) are conducted through the first mounting plate and the second mounting plate and are received by the ultrasonic receiver; The ultrasonic receiver (2) is a multiple-frequency receiver with frequency identification function, and the ultrasonic receiver (2) transmits the real-time received ultrasonic spectrum to the detection controller.

3. The aircraft bomb rack maintenance detection device according to claim 2, wherein: The detection controller controls the aircraft bomb rack detection, including mounting plate detection mode and hook rack detection mode.

4. The aircraft bomb rack maintenance detection device according to claim 3, wherein: In the mounting plate detection mode, the gas heater (7) is heated, hot air enters the detection mounting box and flows inside the detection mounting box; the infrared thermal imager performs thermal imaging on the first mounting plate; after the surface temperature of the first mounting plate stabilizes, the heating and air flow are stopped, and then the ultrasonic transmitter (1) starts the fixed-frequency emission; the infrared thermal imager detects the surface temperature of the first mounting plate in real time and transmits it to the detection controller; the detection controller transmits the acquired infrared thermal imaging image to the host computer together with the standard image stored in the memory; After completing the detection of the first mounting plate, the detection mounting box is turned over, the infrared thermal imager is aligned with the second mounting plate, and the same method as detecting the first mounting plate is used to detect the second mounting plate.

5. The aircraft bomb rack maintenance detection device according to claim 4, wherein: In the hook rack detection mode, the air inside the detection mounting box does not flow, and the ultrasonic transmitter (1) starts the sweep frequency emission; the sweep frequency transmitter drives the ultrasonic transmitter (1) to continuously sweep between 20 kHz and 1 MHz, so that the ultrasonic transmitter (1) continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; during the sweep, the sweep frequency transmitter feeds back the emitted frequency to the detection controller in real time; The ultrasonic receiver (2) receives ultrasonic waves when the hook rack of the bomb rack is in the mounted state and the released state, respectively, and transmits the received ultrasonic spectrum to the detection controller in real time; The detection controller forms a three-dimensional data cube of the ultrasonic spectrum changing with time, and transmits the three-dimensional data cube to the host computer; the host computer inputs the data cube into the diagnostic model, and the diagnostic model outputs whether the hook rack has a fault and the type of the fault; the host computer transmits whether the hook rack has a fault and the type of the fault to the detection controller.

6. The aircraft bomb rack maintenance detection device according to claim 1, wherein: The detection controller is also connected with a display module, which is used to display the working state of the detection device, the images acquired by the infrared thermal imager in real time, the state of communication with the host computer, and the detection results returned by the host computer.

7. A method for performing maintenance inspection of an aircraft bomb rack using the aircraft bomb rack maintenance inspection device of any one of claims 1-6, characterized in that The method comprises the following steps: Step 1: Bring the maintenance detection device to the detection site, and install the aircraft bomb rack into the detection mounting box, the elastic coupling member clamps the side of the first mounting plate and the second mounting plate from both ends, and the elastic coupling member does not directly contact the hook rack; Step 2: The detection controller sends a detection test signal to the host computer to determine whether the host computer and the detection controller are in good connection state; then the host computer sends a detection instruction to the detection controller to start the mounting plate detection; Step 3, the detection controller controls the gas heater (7) to heat, hot air enters the detection installation box, the air inlet valve (5) and the air outlet valve (6) are opened, and the gas flows in the detection installation box; the infrared thermal imager performs thermal imaging on the first installation plate; after the surface temperature of the first installation plate is stable, heating is stopped, the air inlet valve (5) and the air outlet valve (6) are closed, and the gas flow is stopped; then the ultrasonic transmitter (1) starts the fixed frequency emission and emits ultrasonic waves with a frequency F1; the infrared thermal imager detects the surface temperature of the first installation plate in real time and sends it to the detection controller; due to the ultrasonic vibration, the surface temperature of the first installation plate changes, and heat accumulates at different positions on the surface of the first installation plate; after the surface temperature of the first installation plate is stable, the detection controller sends the acquired infrared thermal image, i.e., the first detection image, to the upper computer together with the first standard image stored in the memory; The upper computer performs grayscale processing on the first detection image and the first standard image, and then performs normalization processing; the upper computer compares the processed first detection image and the first standard image, and calculates the comparison result R1; if R1 exceeds the threshold value, it means that the first installation plate surface has defects and needs to be replaced; If R1 does not exceed the threshold value, it means that the first installation plate is qualified; Step 4, after the detection of the first installation plate is completed, the aircraft bomb rack is reinstalled in the detection installation box so that the second installation plate can be photographed by the infrared thermal imager; the detection controller controls the gas heater (7) to heat, hot air enters the detection installation box, the air inlet valve (5) and the air outlet valve (6) are opened, and the gas flows in the detection installation box; the infrared thermal imager performs thermal imaging on the second installation plate; after the surface temperature of the second installation plate is stable, heating is stopped, the air inlet valve (5) and the air outlet valve (6) are closed, and the gas flow is stopped; then the ultrasonic transmitter (1) starts the fixed frequency emission and emits ultrasonic waves with a frequency F2; the infrared thermal imager detects the surface temperature of the second installation plate in real time and sends it to the detection controller; due to the ultrasonic vibration, the surface temperature of the second installation plate changes, and heat accumulates at different positions on the surface of the second installation plate; after the surface temperature of the second installation plate is stable, the detection controller sends the acquired infrared thermal image, i.e., the second detection image, to the upper computer together with the second standard image stored in the memory; The upper computer performs grayscale processing on the second detection image and the second standard image, and then performs normalization processing; the upper computer compares the processed second detection image and the second standard image, and calculates the comparison result R2; if R2 exceeds the threshold value, it means that the second installation plate surface has defects and needs to be replaced; if R2 does not exceed the threshold value, it means that the second installation plate is qualified; Step 5, after the installation plate detection is completed, the upper computer sends a detection instruction to the detection controller and starts the hook rack detection; Close the air inlet valve (5) and the air outlet valve (6), detect the air inside the installation box not to flow, the ultrasonic transmitter (1) starts the frequency sweep transmission; the frequency sweeper drives the ultrasonic transmitter (1) to continuously sweep between 20 kHz and 1 MHz, so that the ultrasonic transmitter (1) continuously emits ultrasonic waves with a frequency of 20 kHz to 1 MHz; when sweeping, the frequency sweeper feeds back the transmitted frequency to the detection controller in real time; If there are microcracks or fracture defects in the hook rack, the ultrasonic waves received from the mounting plate will cause the hook rack defect position to resonate when they reach the rack, and the ultrasonic energy will be consumed, thereby the sound wave energy finally transmitted to the ultrasonic receiver (2) will change, so that the vibration spectrum received when there is a defect is different from that when it is intact; The ultrasonic receiver (2) receives ultrasonic waves when the hook rack of the bomb rack is in the hanging state and the releasing state respectively, and sends the received ultrasonic spectrum to the detection controller in real time; The detection controller forms a three-dimensional data cube of the ultrasonic spectrum changing with time, and sends the three-dimensional data cube to the upper computer; the upper computer inputs the data cube into the diagnostic model, and the diagnostic model outputs whether the hook rack has a fault and the type of the fault; the upper computer sends whether the hook rack has a fault and the type of the fault to the detection controller.

8. The method for maintaining and detecting the aircraft bomb rack according to claim 7, wherein: The frequency F1 is the ultrasonic resonance frequency of the first mounting plate, and the frequency F2 is the ultrasonic resonance frequency of the second mounting plate; the normalization processing method is to make the sum of the pixel gray values of the detection image equal to the standard image; The calculation method of R1 and R2 is: Differential the processed first detection image and the first standard image, that is, difference the image pixels, and form an array with the gray values of the pixels after the difference, calculate the variance of the array, and the variance is R1; calculate R2 in the same way by using the second detection image and the second standard image; The construction method of the diagnostic model is: 1) First, count the vulnerable positions and types of the hook rack, and make standard test pieces with different positions and different types of defects after counting; place the standard test pieces in the same environment as the actual detection for frequency sweep detection; each defect is detected multiple times to form an input set; the corresponding defect type and defect position are taken as an output set; 2) Use the input set and the output set to construct a diagnostic model, and the construction method is an SVM classification model, a CNN neural network model, or a least squares classification model.

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