CN114791359A - Positioning method and detector for abnormal particulate matters in gas circuit of aero-engine - Google Patents
Positioning method and detector for abnormal particulate matters in gas circuit of aero-engine Download PDFInfo
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Abstract
The invention discloses a method for positioning abnormal particles in a gas circuit of an aircraft engine, which comprises the steps of establishing an induction field model of a static vector detector, analyzing factors influencing the spatial sensitivity of the static vector detector, revealing the influence mechanism of the material, the structure, the surrounding environment and the layout of the detector on the induction performance, and then constructing a static vector detection system suitable for sensing the early fault of a gas circuit component; and then determining the area where the abnormal particulate matter occurs based on the correlation analysis result of the monitoring signal. The invention also provides a detector capable of realizing the positioning method. The method has strong practicability and functionality, and can be widely applied to the technical field of state monitoring, fault diagnosis and system health management and maintenance of aircraft engines.
Description
Technical Field
The invention relates to the technical field of state monitoring, fault diagnosis and system health management and maintenance of an aircraft engine, in particular to a positioning method and a detector for abnormal particulate matters in an air passage of the aircraft engine.
Background
The method for monitoring the particles in the gas circuit of the aero-engine is a real-time online monitoring method suitable for severe environments of the gas circuit of the aero-engine, and can effectively perform online monitoring on gas circuit components with high faults and provide early warning information. When the aero-engine works in a healthy state, the quantity of the carbon soot particles in the gas path is relatively stable, the overall static charge level can also fluctuate stably within a certain range, and the static charge level in the tail gas of the healthy engine mainly depends on the quantity of the carbon soot particles. When an engine fails or combustion performance deteriorates, a large amount of abnormal particulate matter is generated (e.g., when engine components fail by scuffing, erosion, burning, etc.). The particle diameters of the particulate matters are greatly different, the particle diameters of soot particulate matters generated by combustion under normal conditions are distributed in a bimodal mode in the ranges of 4-6nm and 20-30nm, the particle diameters of the particulate matters generated by faults are more than 40 microns, and due to the fact that the different particle diameters of the particulate matters cause different charge quantities carried by the particulate matters, abnormal particulate matters can cause the change of the static charge level in a gas path. The change information of the electrostatic fields provides important symptom information for early failure early warning of the aircraft engine. Therefore, the establishment of the abnormal particulate matter detector suitable for the severe gas circuit environment and how to utilize the detector to detect abnormal particulate matter are the basis for realizing the health monitoring of the gas circuit component of the aero-engine. Because the pipe diameter of the engine spray pipe is large, the monitoring range of a single detector is limited, and a plurality of detectors are usually required to be installed, the electrostatic array detector is constructed to monitor the whole gas circuit.
Moreover, the faults of the engine gas path component usually generate abnormal particulate matters, and the abnormal particulate matters rub against the pipe wall and the particulate matters under the drive of high-speed airflow to carry electric charges. When the same charged particles pass through different detectors, the change of the output signal of the detector is approximately the same. The cross-correlation calculation result can represent the similarity degree of the output signals, cross-correlation calculation is carried out on every two output signals of each detector, the two detectors corresponding to the maximum value of the correlation coefficient, and the detection area of the two detectors is the position range where the particulate matters appear.
Therefore, a technique capable of specifically solving the above-described problems has yet to be proposed.
Disclosure of Invention
In order to solve the problems, the invention provides a method capable of monitoring the position of abnormal particles of an engine.
The technical scheme provided by the invention is as follows:
a positioning method for abnormal particles in an aircraft engine gas path is characterized in that an induction field model of a static vector detector is established, factors influencing the spatial sensitivity of the static vector detector are analyzed, the influence mechanism of the material, the structure, the surrounding environment and the layout of the detector on the induction performance is revealed, and then a static vector detection system suitable for early fault perception of a gas path component is constructed; and then determining the area where the abnormal particulate matter occurs based on the correlation analysis result of the monitoring signal.
Preferably, in the process of constructing the electrostatic vector detection system, the electrostatic vector detector, the potential test, the signal conditioning circuit, the signal transmission, the signal integral conversion and the vector calculation module are utilized for construction; the signal output by the static vector detection system reflects the static charge state of a detection space, then a dynamic characteristic function of the whole test system is obtained, a corresponding relation between the induced charge and the output signal is established, and then the static vector detection system is optimized;
installing a detector for monitoring abnormal particulate matters at the rear side of an engine spray pipe and an afterburner, and enabling one end of a probe of the detector to extend into an airflow channel and the other end of the probe to be connected with acquisition and processing equipment through a data line;
and (4) utilizing correlation analysis of the output signals of the detectors to locate the positions of abnormal particulate matters.
Preferably, when the position of the abnormal particulate matter is located, the following implementation processes are included:
respectively calculating Output signals Output of the single electrostatic detector 1 And other detector outputsThe correlation coefficient between the signals is specifically:
(1) is provided with N detectors, the serial numbers are distributed according to the clockwise direction and are sequentially detectors No. 1, 2 and 3 … … N, and the Output signal of the ith detector is Output i ；
(2) Calculating a correlation coefficient Corr _ coef between the detector output signal and the other detector output signals, respectively (i,j) Acquiring N-1 correlation coefficients and constructing a correlation coefficient set Corr _ coef, wherein i and j are sensor numbers, and i is not equal to j;
(3) finding the maximum Corr _ coef in the set of correlation coefficients max And then the particulate matters are considered to be present in the area between the two corresponding detectors, so that the function of positioning the abnormal particulate matters is realized.
Preferably, six detectors for realizing monitoring are arranged and are uniformly arranged on the same cross section; the acquisition and processing equipment respectively selects monitoring signals of any two detectors in the six detectors to carry out correlation calculation, calculation results are combined into a correlation coefficient set, and detection ranges of the two detectors corresponding to the maximum value in the set are regions where particulate matters appear.
The invention also provides a technical scheme that:
a detector for detecting abnormal particulate matters in an air path of an aircraft engine is used for implementing the positioning method and comprises the following steps:
the external part of the probe is coated with an insulating part, and a demodulation circuit module is arranged at the front end of the probe and in the contact direction with the insulating part;
the shielding cover is arranged outside the probe and covers the insulating part and the demodulation circuit module inside the shielding cover;
and a mounting hole provided on the shield case.
Preferably, the insulator is provided at a side portion and a front end portion of the probe.
Compared with the prior art, the invention has the advantages that:
the detectors are arranged on the cross sections behind the engine spray pipe and the afterburner and are uniformly distributed, and the electrostatic vector detection system suitable for sensing the early fault of the gas circuit part is constructed by establishing a model and optimizing the system, so that the existence positions of abnormal particulate matters are conveniently obtained, and guidance is provided for later maintenance;
by adopting the method provided by the invention, the area where the abnormal particulate matters really appear based on the correlation analysis result of the monitoring signal has certain guidance and reference values, the reference is provided for the maintenance of the engine, and the maintenance complexity is reduced, so that the targeted maintenance treatment is realized.
Drawings
FIG. 1 is a block diagram of a detector in an embodiment of the invention;
FIG. 2 is a block diagram of a probe in an embodiment of the invention;
FIG. 3 is a view showing an installation structure of a probe in the embodiment of the present invention;
fig. 4 is a sectional view a-a in fig. 3.
Detailed Description
The present invention is described in further detail below with reference to figures 1-4.
A positioning method for abnormal particles in an aircraft engine gas path is characterized by establishing an induction field model of a static vector detector, analyzing factors influencing the spatial sensitivity of the static vector detector, revealing the influence mechanism of the material, structure, surrounding environment and layout of the detector on the induction performance, and then constructing a static vector detection system suitable for early fault perception of a gas path component; and then determining the area where the abnormal particulate matter occurs based on the correlation analysis result of the monitoring signal.
In the process of constructing the static vector detection system, a static vector detector, a potential test module, a signal conditioning circuit module, a signal transmission module, a signal integral conversion module and a vector calculation module are utilized for construction; the signal output by the static vector detection system reflects the static charge state of a detection space, then a dynamic characteristic function of the whole test system is obtained, a corresponding relation between the induced charge and the output signal is established, and then the static vector detection system is optimized;
installing a detector for monitoring abnormal particulate matters at the rear side of an engine spray pipe and an afterburner, and enabling one end of a probe of the detector to extend into an airflow channel and the other end of the probe to be connected with acquisition and processing equipment through a data line;
and (4) utilizing correlation analysis of the output signals of the detectors to locate the positions of abnormal particulate matters.
When the position of the abnormal particulate matter is located, the implementation process comprises the following steps:
respectively calculating Output signals Output of the single electrostatic detector 1 And the correlation coefficient between the output signals of other detectors is specifically as follows:
(1) is provided with N detectors, the serial numbers are distributed according to the clockwise direction and are sequentially detectors No. 1, 2 and 3 … … N, and the Output signal of the ith detector is Output i ；
(2) Calculating a correlation coefficient Corr _ coef between the detector output signal and the other detector output signals, respectively (i,j) Acquiring N-1 correlation coefficients and constructing a correlation coefficient set Corr _ coef, wherein i and j are sensor numbers, and i is not equal to j;
(3) finding the maximum Corr _ coef of the set of correlation coefficients max And then the particles are considered to be present in the area between the two corresponding detectors, so that the function of positioning the abnormal particles is realized.
Six detectors are installed for real-time monitoring of the state of the engine and are uniformly distributed on the same cross section; the acquisition and processing equipment respectively selects monitoring signals of any two detectors in the six detectors to carry out correlation calculation, calculation results are combined into a correlation coefficient set, and detection ranges of the two detectors corresponding to the maximum value in the set are regions where particulate matters appear.
The present invention will be further described with reference to specific examples.
By establishing an induction field model of the electrostatic vector detector and analyzing factors influencing the spatial sensitivity of the electrostatic vector detector, the influence mechanism of the material, the structure, the surrounding environment and the layout of the detector on the induction performance is disclosed, and finally, an electrostatic vector detection system suitable for early fault sensing of the gas circuit component is constructed; and then determining the area where the abnormal particulate matter occurs based on the correlation analysis result of the monitoring signal. The specific content is as follows:
1. the structure of the detector is optimally designed:
the overall electrostatic field of the aircraft engine gas circuit is a vector, has directionality and certain size, needs to design corresponding electrostatic vector detector as the source of acquireing aircraft engine gas circuit electrostatic field information, and the quality of detector performance plays important decisive role to monitoring system and the accurate assurance of gas circuit part operating condition, and detector response characteristic receives the influence of many factors such as the shield edge of probe position, the structural arrangement of probe, material, peripheral medium, detector.
A vector detection system is constructed by utilizing a static vector detector, potential tests (including measurement, amplification, filtering and the like), a signal conditioning circuit, signal transmission, signal integral conversion, a vector calculation module and the like, signals output by the whole system reflect the static charge condition of a detection space, further a dynamic characteristic function of the whole test system is obtained, and the corresponding relation between the induced charges and output signals is established, so that the vector detection system is used for the optimal design of the whole static vector detection system.
2. The installation and use method of the detector comprises the following steps:
the detector can be suitable for airborne and ground bench experiments of the engine. And 6 mounting bosses are arranged on one section behind the engine spray pipe and the afterburner, each boss is provided with one detector, and the sensing directions of the detectors at different positions are different respectively to form a detector array. The detector comprises a probe, a shielding cover, a demodulation circuit board and other structures, wherein one end of the probe of the detector extends into the airflow channel during working, and the other end of the probe is connected with the acquisition processing equipment through a data line. When the engine is started, state monitoring data acquisition is started, when particles generated during the working period of the engine pass through a detection space of the detector, the charge distribution on the sensitive probe changes to form induced current, the induced current is converted and amplified by a circuit in the detector to form a voltage signal which is transmitted to a terminal, and an acquisition program processes, analyzes and displays the data of the detectors in real time, so that observers can make decisions conveniently.
3. And (3) positioning analysis of abnormal particulate matters:
the invention adopts the correlation analysis of the output signal of the detector to position the abnormal particulate matter.
Respectively calculating Output signals Output of the single electrostatic detector 1 And the correlation coefficient between the output signals of other detectors is specifically as follows:
(1) is provided with N detectors, the serial numbers are distributed according to the clockwise direction and are sequentially detectors No. 1, 2 and 3 … … N, and the Output signal of the ith detector is Output i ；
(2) Calculating a correlation coefficient Corr _ coef between the detector output signal and the other detector output signals, respectively (i,j) I and j are sensor numbers, i is not equal to j, N-1 correlation coefficients are obtained, and a correlation coefficient set Corr _ coef is constructed;
(3) finding the maximum Corr _ coef of the set of correlation coefficients max And then the particulate matters are considered to be present in the area between the two corresponding detectors, so that the function of positioning the abnormal particulate matters is realized.
The detector provided by the invention comprises:
the probe 1, the exterior of the probe 1 is wrapped with an insulating part 2, and a demodulation circuit module 3 is arranged at the front end of the probe 1 and in the contact direction with the insulating part 2;
the shielding cover 4 is arranged outside the probe 1, and covers the insulating part 2 and the demodulation circuit module 3 inside the shielding cover 4;
and a mounting hole provided in the shield case 4.
The insulator 2 is provided at the side and front end of the probe 1.
Referring to fig. 2, D is the probing angle, M is the size of the shielding layer, W is the size of the isolation layer, T is the size of the probe, and H is the depth of the probe.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should be able to conceive of the present invention without creative design of the similar structural modes and embodiments without departing from the spirit of the present invention, and all such modifications should fall within the protection scope of the present invention.
Claims (6)
1. A positioning method for abnormal particles in an aircraft engine gas path is characterized in that an induction field model of a static vector detector is established, factors influencing the spatial sensitivity of the static vector detector are analyzed, the influence mechanism of the material, the structure, the surrounding environment and the layout of the detector on the induction performance is revealed, and then a static vector detection system suitable for sensing early fault information of a gas path component is established; and then determining an area where abnormal particulate matter occurs based on the result of the correlation analysis of the monitoring signals.
2. The method for positioning the abnormal particulate matters in the gas circuit of the aircraft engine according to claim 1, wherein in the process of constructing the static vector detection system, a static vector detector, a potential test module, a signal conditioning circuit module, a signal transmission module, a signal integral conversion module and a vector calculation module are used for construction; the signal output by the static vector detection system reflects the static charge state of a detection space, then a dynamic characteristic function of the whole test system is obtained, a corresponding relation between the induced charge and the output signal is established, and then the static vector detection system is optimized;
installing a detector for monitoring abnormal particulate matters at the rear side of an engine spray pipe and an afterburner, and enabling one end of a probe of the detector to extend into an airflow channel and the other end of the probe to be connected with acquisition and processing equipment through a data line;
and (4) utilizing correlation analysis of the output signals of the detectors to locate the positions of abnormal particulate matters.
3. The method for locating the abnormal particulate matters in the gas circuit of the aircraft engine as claimed in claim 2, wherein when the position of the abnormal particulate matters is located, the method comprises the following implementation processes:
respectively calculating Output signals Output of the single electrostatic detector 1 And phase between other detector output signalsThe correlation coefficient is specifically as follows:
(1) is provided with N detectors, the serial numbers are distributed according to the clockwise direction and are sequentially detectors No. 1, 2 and 3 … … N, and the Output signal of the ith detector is Output i ；
(2) Calculating a correlation coefficient Corr _ coef between the detector output signal and the other detector output signals, respectively (i,j) I and j are sensor numbers, i is not equal to j, N-1 correlation coefficients are obtained, and a correlation coefficient set Corr _ coef is constructed;
(3) finding the maximum Corr _ coef in the set of correlation coefficients max And then the particulate matters are considered to be present in the area between the two corresponding detectors, so that the function of positioning the abnormal particulate matters is realized.
4. The method for positioning the abnormal particulate matters in the gas circuit of the aero-engine according to claim 3, wherein six detectors are mounted for real-time monitoring of the engine state and are uniformly arranged on the same cross section; the acquisition and processing equipment respectively selects monitoring signals of any two detectors in the six detectors to carry out correlation calculation, calculation results are combined into a correlation coefficient set, and detection ranges of the two detectors corresponding to the maximum value in the set are regions where particulate matters appear.
5. A detector for detecting abnormal particles in an aircraft engine gas path, which is used for implementing the positioning method of any one of claims 1-4 and comprises the following steps:
the demodulation circuit module is arranged at the front end of the probe and in the direction of contacting with the insulating part;
the shielding cover is arranged outside the probe and covers the insulating part and the demodulation circuit module inside the shielding cover;
and a mounting hole provided on the shield case.
6. A probe according to claim 5, wherein the insulator is provided at the side and front of the probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210439368.2A CN114791359A (en) | 2022-04-25 | 2022-04-25 | Positioning method and detector for abnormal particulate matters in gas circuit of aero-engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210439368.2A CN114791359A (en) | 2022-04-25 | 2022-04-25 | Positioning method and detector for abnormal particulate matters in gas circuit of aero-engine |
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| CN114791359A true CN114791359A (en) | 2022-07-26 |
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