CN117990282B - Leakage alarm monitoring method and system for aircraft bleed air pipeline - Google Patents
Leakage alarm monitoring method and system for aircraft bleed air pipeline Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/002—Investigating fluid-tightness of structures by using thermal means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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Abstract
The invention provides an aircraft bleed air pipeline leakage alarm monitoring method and system, comprising the following steps: acquiring wavelength information sensed by a first channel and a second channel, and demodulating the wavelength information to obtain temperature data of the aircraft bleed air pipeline; judging whether the sensed temperature data of the first channel and the second channel exceeds an alarm threshold value, if so, executing the next step; acquiring temperature data in T3 historical time of the first channel and the second channel, and calculating temperature rise rates of the first channel and the second channel; and judging whether the temperature rise rate exceeds a temperature rise rate threshold value, and if so, sending out an air entraining pipeline leakage alarm signal. The method combines the real-time data and the historical data of the temperature field around the air entraining pipeline of the aircraft to comprehensively judge the air entraining leakage, effectively reduces the occurrence of false alarm, improves the reliability of alarm, monitors the temperature of the air entraining pipeline in the whole time domain and realizes the accurate temperature setting and positioning of the leakage point.
Description
Technical Field
The invention relates to the technical field of pipeline leakage monitoring, in particular to an aircraft bleed air pipeline leakage alarm monitoring method and system.
Background
The air entraining duct system for airplane is one main component of air source and air conditioner system for regulating the pressure and temperature of air from engine and auxiliary power unit to air source system, and belongs to high temperature and high pressure pipeline system. During the running process of the aircraft, the bleed air pipeline may leak due to the influence of ground-air temperature difference, vibration and other environmental factors. The highest temperature of gas in the bleed air system can reach 260 ℃, and if leakage occurs, the normal operation of a downstream gas supply subsystem is affected, and potential safety hazards are brought to surrounding structures and components of the pipeline. The bleed air system is continuously monitored, and the leakage position of the high-temperature high-pressure gas is timely found and positioned, so that the method has very important practical significance for guaranteeing the flight safety of the aircraft.
At present, an aircraft bleed air leakage detection system widely adopts a eutectic salt type overheat detector for overheat detection and leakage alarm. The detector consists of a central lead, a metal shell and filled eutectic salt materials, wherein the detector is arranged above and along the bleed air pipeline, when bleed air leakage occurs around the detector, the high-temperature gas enables the ambient temperature to rise to an alarm temperature, the eutectic salt is changed into a liquid state from a solid, the resistance between the loop central lead and the shell is rapidly reduced, and the trigger control sends an alarm signal. Because the temperature value of the eutectic salt detector during alarming is irrelevant to the heated length of the detector and is almost a fixed value, the eutectic salt detector is often used for detecting dispersed small-range high temperature, such as bleed air leakage overheat detection.
Existing detectors have several limitations:
1. The alarm mode is single; whether the temperature reaches a threshold value is judged to alarm or not, the temperature field of the aircraft bleed air pipeline cannot be monitored in real time in detection, and alarm signals are analyzed and judged, so that false alarm is easy to generate, and the reliability is low; and when an alarm occurs, the system can only identify which detection loop fails and cannot accurately position the failure position, so that the maintenance time and cost of the air entraining system are greatly increased.
2. Is easy to be interfered by external environment; on one hand, as an electric sensor, a detection system is easily interfered by airborne equipment and external electromagnetic signals; on the other hand, the external environment where the detection element is located is severe, environmental factors such as sudden temperature change from the ground to the air, dust, greasy dirt and air humidity can all influence the performance of the detection element, for example, the connection point of the sensing element is influenced by the greasy dirt and can generate open-circuit faults, and the resistance value of the insulating material can be greatly reduced when the humidity is high, so that the detection system faults or false alarms and missing alarms are generated.
According to statistics, in actual flight at home and abroad, because the aircraft return rate of the actual bleed air leakage is relatively low, most faults are generated due to false alarms of the bleed air leakage detection system.
Therefore, improving the reliability of bleed air leakage detection systems is a highly desirable problem in the industry, and there is a strong need for a bleed air leakage detection system that is simple to install and is not susceptible to environmental impact, and a highly reliable alarm method.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide the method and the system for monitoring the leakage of the air entraining pipeline of the aircraft, which are used for comprehensively judging the leakage of the air entraining by combining the real-time data and the historical data of the temperature field around the air entraining pipeline of the aircraft, so that the occurrence of false alarm is effectively reduced, the reliability of alarm is improved, and meanwhile, the centimeter-level temperature monitoring of the whole time universe of the air entraining pipeline of the aircraft can be realized, so that the accurate temperature fixing and positioning of the leakage point can be realized.
The invention provides an aircraft bleed air pipeline leakage alarm monitoring system, which comprises:
the sensor module is used for monitoring optical signals of temperature changes of the aircraft bleed air pipeline and comprises a double-channel fiber bragg grating sensor;
the demodulation module is used for demodulating the optical signals with the temperature change to obtain the double-channel temperature data of the air entraining pipeline;
The judging module is used for comparing whether the temperature data of the two channels exceeds an alarm threshold value and a temperature rise rate threshold value, judging through the two-channel joint logic so as to confirm whether the air entraining pipeline is in an overheat alarm state, and if so, sending an alarm trigger signal;
And the alarm module is used for receiving the alarm trigger signal and sending the leakage alarm signal of the air entraining pipeline.
The invention relates to a leakage alarm monitoring method for an aircraft bleed air pipeline, which utilizes the monitoring system to execute leakage alarm monitoring, and comprises the following steps:
Step one: acquiring wavelength information sensed by a first channel and a second channel, and demodulating the wavelength information to obtain temperature data of the aircraft bleed air pipeline;
Step two: judging whether the sensed temperature data of the first channel and the second channel exceeds an alarm threshold value, if so, executing the third step;
step three: acquiring temperature data in T3 historical time of the first channel and the second channel, and calculating temperature rise rates of the first channel and the second channel;
step four: and judging whether the temperature rise rate exceeds a temperature rise rate threshold value, and if so, sending out an air entraining pipeline leakage alarm signal.
In an embodiment of the present invention, before executing the second step, the method further includes:
the monitoring system repeatedly detects abnormal states within preset interval time, and if the detection result is normal, the second step is continuously executed; if the detection result is abnormal, sending out a monitoring system fault alarm, and stopping executing the second step.
In an embodiment of the present invention, the step of determining whether the sensed temperature data of the first channel and the second channel exceeds the alarm threshold specifically includes:
In the time T1, the temperature data of the first channel and the second channel exceed an alarm threshold value, and the duration of the temperature data exceeding the alarm threshold value exceeds the time T2, and the fact that the alarm threshold value is exceeded is confirmed;
Or in the time T1, the temperature data of the first channel and the second channel exceed the alarm threshold value, the duration of the temperature data exceeding the alarm threshold value does not exceed the time T2, and the air entraining pipeline is in a normal temperature state.
In an embodiment of the present invention, the step of determining whether the sensed temperature data of the first channel and the second channel exceeds the alarm threshold specifically includes:
in the time T1, the temperature data of the first channel and the second channel do not exceed the alarm threshold, and after the time T1, the temperature data of the first channel and the second channel are lower than the alarm threshold, so that the air entraining pipeline is in a normal temperature state;
Or in the time T1, the temperature data of the first channel and the second channel do not exceed the alarm threshold, and after the time T1, the temperature data of any channel of the first channel and the second channel is higher than the alarm threshold, so that the monitoring system gives out fault alarm.
In an embodiment of the present invention, the T1 time is 30 seconds to 60 seconds, and the T2 time is 5 seconds to 10 seconds.
In an embodiment of the present invention, the calculation formula of the temperature rise rate is:
；
Wherein, In order to achieve the rate of temperature rise,To acquire the start time of the T3 history time of the history temperature data,To obtain the end of the T3 history time of the history temperature data,Is thatThe temperature data of the moment of time,Is thatTemperature data of time;
the T3 historical time is a historical time period when the monitoring system enters the high-temperature state time node, and the value is 250 seconds-350 seconds.
In an embodiment of the present invention, the specific step of determining whether the temperature rise rate exceeds a temperature rise rate threshold in the fourth step includes:
and in the T3 historical time, if the temperature rise rates of the first channel and the second channel exceed the temperature rise rate threshold, confirming that the temperature rise rate threshold is exceeded.
In an embodiment of the invention, corresponding temperature rise rate thresholds are set according to different detection areas.
In one embodiment of the present invention, the leakage alarm signal includes an overheat temperature value and leakage area position information.
The beneficial effects of the invention are as follows: the invention provides an aircraft bleed air pipeline leakage alarm monitoring method and system, which are used for introducing the flows of system self-checking, historical temperature data judgment, temperature rise rate judgment and the like while considering an alarm threshold value and utilizing double loops to carry out logic judgment, so that the false alarm condition of the system under different working conditions is reduced, and the reliability of the system is improved.
Drawings
In order to more clearly illustrate the embodiments or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a monitoring system based on a fiber grating sensor array according to an embodiment of the present invention;
fig. 2 is a flow chart of an aircraft bleed air duct leak alarm monitoring method in accordance with an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. In the drawings, like elements are designated by like reference numerals.
An aircraft bleed air duct leak alarm monitoring system, the monitoring system comprising:
The sensor module is used for monitoring optical signals of temperature changes of the aircraft bleed air pipeline and comprises a double-channel fiber bragg grating sensor; the method mainly comprises a dense fiber grating array, wherein the leakage monitoring of the air-entraining pipeline of the aircraft is divided into different monitoring areas, and two identical and mutually independent monitoring channels are arranged in each area, so that the temperature information near the air-entraining pipeline can be acquired in real time and transmitted in the form of optical signals.
The demodulation module is used for demodulating the optical signals with the temperature change to obtain the double-channel temperature data of the air entraining pipeline; the demodulation module is mainly composed of signal conversion and processing chips such as an FPGA and the like, and can convert optical signals carrying temperature information acquired by the sensor module into temperature data in the form of digital signals. The demodulation principle is that the tunable laser can output laser with the wavelength continuously changed within a certain range, the pulse modulator can modulate the output laser into pulse light, the tunable laser and the pulse modulator are controlled by a data acquisition processing system (FPGA 7Z020 chip), the modulated pulse light is divided into multiple paths of light through an optical divider and is input into a fiber grating sensing array through a circulator, the pulse light can be reflected when passing through a grating, the reflected light is output into a photoelectric detector array through the circulator, the reflected light is converted into an electric signal through an optical signal, and then the electric signal is input into the data acquisition processing system for demodulation, wavelength information of each grating is restored, and then temperature information on each grating position is calculated.
The judging module is used for comparing whether the temperature data of the two channels exceeds an alarm threshold value and a temperature rise rate threshold value, judging through the two-channel joint logic so as to confirm whether the air entraining pipeline is in an overheat alarm state, and if so, sending an alarm trigger signal; the judging module consists of a computer (upper computer), can process temperature data near the air entraining pipeline, and can judge the temperature by combining with real-time temperature data, historical temperature data, system working state and other factors of the air entraining pipeline, so as to judge whether the air entraining pipeline is in an overheat alarm state, and if so, the alarm module is triggered.
And the alarm module is used for receiving the alarm trigger signal and sending the leakage alarm signal of the air entraining pipeline. The alarm module mainly comprises a communication chip and can send overheat alarm information, overheat alarm temperature and area information to an external system such as an aircraft avionics system.
In an alternative embodiment, the monitoring system further includes a storage module, which is mainly composed of a storage chip, and can store software codes for implementing the demodulation module, the judgment module and the alarm module, and data such as temperature data, position information and system working state acquired by the sensor module.
It should be noted that fig. 1 shows a schematic diagram of a monitoring system based on a fiber grating sensing array according to the present invention; the basic principle of the time division, wavelength division and space division mixed multiplexing fiber grating sensing array used by the system is that the system is provided with the optical fiber grating sensing array. The tunable laser can output laser with the wavelength continuously changed within a certain range, the pulse modulator can modulate the output laser into pulse light, the tunable laser and the pulse modulator are controlled by a data acquisition processing system (FPGA and an upper computer), the modulated pulse light is divided into multiple paths of light through an optical divider and is input into the fiber grating sensing array through the circulator, the pulse light can be reflected when passing through the grating, the reflected light is output into the photoelectric detector array through the circulator, the light signal is converted into an electric signal, the electric signal is input into the data acquisition processing system for demodulation, the wavelength information of each grating is restored, and the temperature information on the position of each grating is further calculated. The invention realizes centimeter-level temperature monitoring of the whole-time domain of the aircraft bleed air pipeline and can accurately fix the temperature and position the leakage point.
The sensing array utilizes time division multiplexing to improve the detection length of a single sensing network and the multiplexing capacity of the grating; the wavelength division multiplexing is utilized to not only improve the multiplexing capacity of the grating and the bandwidth utilization rate of the light source, but also improve the perceived density of a single optical fiber on the premise of not improving the performance of the light source; the multiplexing capacity of the whole system is improved by utilizing space division multiplexing, and the sensing density of the sensing array is improved.
The invention also provides a leakage alarm monitoring method for the aircraft bleed air pipeline, which utilizes the monitoring system in the embodiment to execute leakage alarm monitoring; as shown in the flowchart of the method in fig. 2, the specific steps of the method include:
step one: wavelength information sensed by the first channel and the second channel is acquired, and temperature data of the aircraft bleed air pipeline are obtained after the wavelength information is demodulated.
It should be noted that, the fiber bragg grating sensors in the first channel and the second channel can acquire temperature information near the bleed air pipeline in real time, and transmit the temperature information to the signal demodulation module in the form of an optical signal. The signal demodulation module can convert the optical signals carrying the temperature information of the first channel and the second channel into temperature data, and the judgment module can acquire the temperature data of the first channel and the second channel at the current moment.
Step two: and judging whether the sensed temperature data of the first channel and the second channel exceeds an alarm threshold value, and if so, executing the third step.
If the temperature data of the first channel and the second channel exceeds the alarm threshold value in the T1 time and the duration of the temperature data exceeding the alarm threshold value exceeds the T2 time, the alarm threshold value is confirmed to be exceeded, and the system enters a double-channel high-temperature state.
If the temperature data of all channels reach the alarm threshold value within T1 seconds after the timing is started, but the duration time does not reach T2 seconds, judging that the air-entraining pipeline is in a normal temperature state;
if the temperature data of A, B channels in the T1 second do not reach the alarm threshold value, and the temperature data of all channels after the T1 second are lower than the alarm threshold value, judging that the air entraining pipeline is in a normal temperature state;
If the temperature data of all channels in the period of T1 seconds do not reach the alarm threshold, and the temperature data of any channel in the temperature data of all channels after the period of T1 seconds is higher than the alarm threshold, the system is considered to have faults at the moment, the working state of the system is set to be the faults, and fault alarm is sent out.
It should be noted that, because the system should react to the leakage of the bleed air pipeline in a short time and send out an overheat alarm, the judging time is not too long, and the setting of the dual-channel sensor is to improve the reliability of the system alarm, the situation of false alarm is reduced by dual-channel joint logic judgment, if the waiting judging time is too short, the system may not reach a stable state, and the accuracy of the alarm is difficult to ensure. In practice, the time setting range of the T1 should be 30 seconds to 60 seconds according to different practical situations. The duration T2 is 5 seconds to 10 seconds, and is set to prevent the influence of temperature data jump caused by environmental factors and internal factors of the system, so that the possibility of false alarm of the system can be reduced, and the reliability of the alarm can be improved. Under different detection areas and working conditions, the system can set different temperature alarm thresholds, and the temperature alarm thresholds are generally within the range of 120-160 ℃.
In an alternative embodiment, before performing the second step, the method further includes: the monitoring system repeatedly detects abnormal states within a preset interval time and is used for judging the working state of the current system. In order to ensure the effectiveness of acquiring the temperature data, the system detects faults of the system per se at intervals, including detection of a sensor module, a demodulation module, a judgment module and an alarm module, if the system fault detection result is normal, the working state of the system is set to be normal, if the system fault detection result is abnormal, the working state of the system is set to be faulty, and fault alarm is sent out, and at the moment, the system cannot work normally. For example, the spectrum information self-checking method can splice the optical signals acquired at each moment to obtain an integral spectrogram, and can judge whether the system is in a normal working state by comparing the integral spectrogram with the spectrogram under normal conditions; for example, the self-checking methods such as light source self-checking, abnormal data judging and the like can also judge whether the system is in a normal working state. The judging module can read the current system working state and judge whether the current system working state is normal or not.
If the detection result is normal, continuing to execute the second step; if the detection result is abnormal, sending out a monitoring system fault alarm, and stopping executing the second step.
In another alternative embodiment, before executing the second step, it is first determined whether the monitoring system is in a single-channel high-temperature state.
Specifically, at a certain moment, when the temperature data of any channel in the two channels reaches a preset alarm threshold, the system enters a single-channel high-temperature state, and the second step is executed; if not, judging that the air entraining pipeline is in a normal temperature state. Under different detection areas and working conditions, the system can set different temperature alarm thresholds, and the temperature alarm thresholds are generally within the range of 120-160 ℃.
Correspondingly, when the system enters a single-channel high-temperature state, a timer in the judging module starts to count, and if the temperature data of all channels reaches an alarm threshold value within the time T1 after counting starts and the duration exceeds the time T2, the system enters a double-channel high-temperature state. The implementation of the subsequent step two is the same as that of the embodiment described above, and will not be described here again.
Step three: and acquiring temperature data in T3 historical time of the first channel and the second channel, and calculating temperature rise rates of the first channel and the second channel.
When the system enters a double-channel high-temperature state, the moment when the system enters the double-channel high-temperature state is recorded asBased on the time dimension, noteThe time T3 seconds before the time isAcquisition ofFrom moment to momentHistorical temperature data for the first and second channels at the time,The historical time isAnd (3) withTime of day interval. It will be appreciated that, in order to ensure the accuracy of the determination,The history time should be relatively long so as to fully reflect the change condition of the temperature of the air-entraining pipeline, but the interval time isSetting too long can result in too large data volume to be calculated by the system, and in addition, the temperature rise rate can be reduced, so that the occurrence of a missing alarm condition is caused. In general terms, the process is carried out,Can be set to a time range of 250 seconds to 350 seconds.
Step four: and judging whether the temperature rise rate exceeds a temperature rise rate threshold value, and if so, sending out an air entraining pipeline leakage alarm signal.
Specifically, the system has acquired historical temperature data of the first and second channels during the T3 historical time, and the temperature data is processed and analyzed to determine whether the bleed air duct is in an overheated state.
First, it is necessary to calculate the temperature rise rates of the first channel and the second channel within T3 secondsAnd. The temperature rise rate represents the change speed of the temperature of the air entraining pipeline in unit time, and the calculation formula of the temperature rise rate is as follows:
；
In the above-mentioned description of the invention, Representing the rate of temperature rise,In order to obtain the starting time of the historical temperature data,In order to obtain the end time of the historical temperature data, which is also the time when the system enters the double-path high-temperature alarm,Is thatThe temperature data of the moment of time,Is thatTemperature data of time. The temperature rise rate can be set to eliminate the influence of the environmental temperature change on the alarm, and under the extreme condition of the aircraft cabin environment, the system can possibly give an alarm, and the setting of the temperature rise rate threshold value effectively avoids the occurrence of the condition, so that the reliability of the alarm is further improved.
Under different detection areas and working conditions, the system can set different temperature rise rate alarm thresholds, and the temperature rise rate threshold is not lower than 5 min/DEG C under the general condition. Specifically, the temperature rise rate alarm threshold of the anti-icing bleed air detection zone is set to be 5 min/DEG C, the temperature rise rate alarm threshold of the APU bleed air detection zone is set to be 8 min/DEG C, and the threshold is generally set according to the environmental condition under the most severe working condition (namely, the maximum environmental temperature rise rate condition).
If the temperature rise rates of all channels in the T3 seconds reach the preset temperature rise rate alarm threshold value, judging that the system is in an overheat alarm state, and sending out an air entraining pipeline leakage alarm signal; if not, judging that the air entraining pipeline is in a normal temperature state.
The alarm module sends out overheat alarm and sends out overheat temperature and area information. The bleed air pipeline is in an overheat leakage state, and the alarm module should send out an overheat alarm of the bleed air pipeline and send specific overheat temperature data and area position information of the bleed air pipeline to external media such as an avionics control system.
In summary, the method and the system for monitoring leakage alarm of the air entraining pipeline of the aircraft provided by the embodiment of the invention comprise the following steps: step one, acquiring wavelength information sensed by a first channel and a second channel, and demodulating the wavelength information to obtain temperature data of the aircraft bleed air pipeline; judging whether the sensed temperature data of the first channel and the second channel exceeds an alarm threshold value, if so, executing a step III; step three, acquiring temperature data in T3 historical time of the first channel and the second channel, and calculating temperature rise rates of the first channel and the second channel; and step four, judging whether the temperature rise rate exceeds a temperature rise rate threshold value, and if so, sending out an air entraining pipeline leakage alarm signal. In the embodiment of the invention, besides considering the alarm threshold and utilizing the double loops to carry out logic judgment, the flows of system self-check, historical temperature data judgment, temperature rise rate judgment and the like are introduced, so that the condition of false alarm of the system under different working conditions is reduced, and the reliability of the system is improved.
It should be noted that, although the present invention has been described in terms of the above embodiments, the above embodiments are not intended to limit the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, so that the scope of the invention is defined by the appended claims.
Claims (7)
1. A method of aircraft bleed air duct leak alarm monitoring, the method being performed by a monitoring system comprising: the sensor module is used for monitoring optical signals of temperature changes of the aircraft bleed air pipeline and comprises a double-channel fiber bragg grating sensor; the demodulation module is used for demodulating the optical signals with the temperature change to obtain the double-channel temperature data of the air entraining pipeline; characterized in that the monitoring system further comprises:
The judging module is used for comparing whether the temperature data of the two channels exceeds an alarm threshold value and a temperature rise rate threshold value, judging through the two-channel joint logic so as to confirm whether the air entraining pipeline is in an overheat alarm state, and if so, sending an alarm trigger signal;
the alarm module is used for receiving the alarm trigger signal and sending a leakage alarm signal of the air entraining pipeline;
The method comprises the following implementation steps:
Step one: acquiring wavelength information sensed by a first channel and a second channel, and demodulating the wavelength information to obtain temperature data of the aircraft bleed air pipeline;
Step two: judging whether the sensed temperature data of the first channel and the second channel exceeds an alarm threshold value, if so, executing the third step;
step three: acquiring temperature data in T3 historical time of the first channel and the second channel, and calculating temperature rise rates of the first channel and the second channel;
Step four: judging whether the temperature rise rate exceeds a temperature rise rate threshold value, and if so, sending out a bleed air pipeline leakage alarm signal;
The step of determining whether the sensed temperature data of the first channel and the second channel exceeds an alarm threshold specifically includes:
In the time T1, the temperature data of the first channel and the second channel exceed an alarm threshold value, and the duration of the temperature data exceeding the alarm threshold value exceeds the time T2, and the fact that the alarm threshold value is exceeded is confirmed;
if the temperature data of the first channel and the second channel exceeds the alarm threshold value within the time T1, and the duration of the temperature data exceeding the alarm threshold value does not exceed the time T2, the air entraining pipeline is in a normal temperature state;
the T1 time is 30-60 seconds, the T2 time is 5-10 seconds, and the T3 historical time is 250-350 seconds.
2. The aircraft bleed air duct leak alarm monitoring method of claim 1, further comprising, prior to performing step two:
the monitoring system repeatedly detects abnormal states within preset interval time, and if the detection result is normal, the second step is continuously executed; if the detection result is abnormal, sending out a monitoring system fault alarm, and stopping executing the second step.
3. The method according to claim 1 or 2, wherein the step of determining whether the sensed temperature data of the first and second channels exceeds an alarm threshold value comprises:
in the time T1, the temperature data of the first channel and the second channel do not exceed the alarm threshold, and after the time T1, the temperature data of the first channel and the second channel are lower than the alarm threshold, so that the air entraining pipeline is in a normal temperature state;
If the temperature data of the first channel and the second channel do not exceed the alarm threshold value in the T1 time, and any channel temperature data of the first channel and the second channel is higher than the alarm threshold value after the T1 time, the monitoring system sends out fault alarm.
4. The aircraft bleed air pipeline leakage alarm monitoring method according to claim 1, wherein the temperature rise rate is calculated according to the formula:
；
Wherein, In order to achieve the rate of temperature rise,To acquire the start time of the T3 history time of the history temperature data,To obtain the end of the T3 history time of the history temperature data,Is thatThe temperature data of the moment of time,Is thatTemperature data of time;
the T3 historical time is a historical period when the monitoring system enters the high-temperature state time node.
5. The method for monitoring leakage alarm of air entraining pipeline of aircraft according to claim 1, wherein the specific step of judging whether the temperature rise rate exceeds a temperature rise rate threshold value in the fourth step comprises:
and in the T3 historical time, if the temperature rise rates of the first channel and the second channel exceed the temperature rise rate threshold, confirming that the temperature rise rate threshold is exceeded.
6. The aircraft bleed air duct leakage alarm monitoring method according to claim 5, characterized in that corresponding temperature rise rate thresholds are set according to different detection areas.
7. The aircraft bleed air duct leakage alarm monitoring method of claim 1, wherein the leakage alarm signal comprises an overheat temperature value and leakage area location information.
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| JPS63246638A (en) * | 1987-04-01 | 1988-10-13 | Tokyo Gas Co Ltd | Method for wide area monitor of fluid leakage |
| JP3780476B2 (en) * | 2000-08-25 | 2006-05-31 | 株式会社日立製作所 | Optical fiber temperature measurement device and heat medium leak detection device |
| GB0703336D0 (en) * | 2007-02-20 | 2007-03-28 | Thermocable Flexible Elements | Temperature detector |
| CN103913279A (en) * | 2014-04-04 | 2014-07-09 | 浙江银轮机械股份有限公司 | Method and device for testing leakproofness of oil cooler by mixing helium and air |
| GB2536497A (en) * | 2015-03-20 | 2016-09-21 | Airbus Operations Ltd | Method of monitoring the pressure of an aircraft tyre |
| EP3905263A4 (en) * | 2018-12-11 | 2022-09-14 | China Nuclear Power Engineering Co., Ltd. | Nuclear power plant leakage monitoring alarm method and alarm system |
| CN212300765U (en) * | 2020-03-27 | 2021-01-05 | 广州市恒宇印铁制罐有限公司 | Automatic leak detection equipment |
| FR3134374A1 (en) * | 2022-04-08 | 2023-10-13 | Airbus Operations (S.A.S.) | Method for monitoring the air sampling pipes of an aircraft. |
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| CN101907507A (en) * | 2010-06-28 | 2010-12-08 | 武汉理工大学 | Leakage monitoring and warning system of large fiber-grating liquid gas storage tank |
| CN105092158A (en) * | 2014-05-20 | 2015-11-25 | 斯奈克玛 | Method for detecting a fluid leak in a turbomachine and system for distributing a fluid |
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