CN116539208A - Detection device for laminated plate with bolts - Google Patents
Detection device for laminated plate with bolts Download PDFInfo
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- CN116539208A CN116539208A CN202310423158.9A CN202310423158A CN116539208A CN 116539208 A CN116539208 A CN 116539208A CN 202310423158 A CN202310423158 A CN 202310423158A CN 116539208 A CN116539208 A CN 116539208A
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
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- 239000010409 thin film Substances 0.000 claims abstract description 45
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- 238000005516 engineering process Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims description 16
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- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 10
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- 238000001020 plasma etching Methods 0.000 claims description 7
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- 238000000151 deposition Methods 0.000 claims description 3
- 125000003003 spiro group Chemical group 0.000 claims description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The application discloses a take detection device of bolt laminated board. The device comprises: the first piezoelectric film sensor is arranged at the first end of the bolt piece; the second piezoelectric film sensor is arranged at the second end of the bolt piece; the first sensor gasket assembly comprises a first mounting gasket and a first film piezoelectric sensor array, wherein the first mounting gasket covers the sensing gasket and is formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the first mounting gasket is sleeved on the periphery of the first end of the bolt; the second sensor gasket assembly comprises a second mounting gasket and a plurality of thin film piezoelectric sensor units which are covered on the sensing gasket and are distributed in an annular interval mode to form a second thin film piezoelectric sensor array, and the second mounting gasket is sleeved on the periphery of the second end of the bolt piece. According to the method, the bolt pretightening force detection technology is combined with the perforated plate hole periphery damage monitoring technology, so that the health of the perforated plate and the bolt connection structure of the perforated plate is monitored in real time, and a new thought is provided for the wing-body connection structure safety monitoring method of the aircraft.
Description
Technical Field
The application relates to the technical field of laminate monitoring, in particular to a detection device for a laminate with bolts.
Background
The fiber reinforced composite material has the performances of high modulus, high strength, low density, small thermal expansion coefficient and the like, and is widely applied to the fields of aerospace, ships, automobiles, buildings and the like. Therefore, the structural safety of the composite material is an important factor for ensuring the normal operation of the whole system. Slight damage can potentially develop and cause catastrophic accidents. The connecting structure of the composite material laminated plate is a key part of the wing-body connecting structure of the aircraft and is also the position most prone to failure, however, the damage detection research of the wing-body connecting structure at home and abroad is less at present, and particularly, the real-time monitoring method of the damage of the hole periphery of the perforated plate is relatively backward, and the structure is usually required to be decomposed for offline test. The testing method is costly and relies on human involvement such as acoustic emission, X-ray and thermal imaging. Therefore, real-time health monitoring of the laminate and its bolted construction is beneficial to improving overall safety.
New methods of structural health monitoring and damage analysis are actively developed in both industry and academia. The requirements for the new monitoring analysis method are as follows, relative to the conventional method: 1) Integrating the monitoring system into the structure (into an intelligent structure); 2) The on-line monitoring of the structure is made possible; 3) The algorithm of data analysis is simple; 4) The ability to identify, locate, quantify lesions, and even predict weaker areas is desirable. The sensors commonly used at present include: optical fiber sensors, piezoelectric sensors, microchip sensors, eddy current sensors, and the like. For example, ultrasonic timing is considered as a bolt pretension monitoring technology with development prospect. Firstly, a wear-resistant and high-temperature-resistant nano composite piezoelectric coating is prepared by a direct-current magnetron sputtering technology and a plasma etching technology. Ultrasonic waves are generated by vibration of the piezoelectric material and propagate along the axial direction of the bolt. And calculating the pretightening force of the bolt through the acoustic time difference between signal generation and signal reception. The intelligent bolt is not only suitable for high-temperature environments, but also improves the detection precision of pretightening force. In addition, there is also an eddy current thin film sensor. The distribution and flow path of the vortex flow are affected by the position change of the hole periphery damage in the horizontal direction and the thickness direction, so that the capability of detecting the hole periphery damage is realized.
Disclosure of Invention
In view of this, this application provides a detection device of take bolt laminated board, not only possesses the change of detection bolt pretightning force, still possesses the ability of monitoring foraminiferous hole week damage size and location.
The application provides a detection device of take bolt laminated plate is suitable for detecting the damage around bolt pretightning force and the bolt hole of taking bolt laminated plate, this take bolt laminated plate including offer the laminated plate of screw hole and spiro union in threaded hole's bolt piece, detection device includes:
a first piezoelectric thin film sensor mounted at a first end of the bolt member;
the second piezoelectric film sensor is arranged at the second end of the bolt piece;
the first sensor gasket assembly comprises a first mounting gasket and a first film piezoelectric sensor array which is covered on the sensing gasket and formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the first mounting gasket is sleeved on the periphery of the first end of the bolt;
the second sensor gasket assembly comprises a second mounting gasket and a second film piezoelectric sensor array which is covered on the sensing gasket and formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the second mounting gasket is sleeved on the periphery of the second end of the bolt;
the first piezoelectric film sensor is configured as an active excitation sensor and is used for exciting a pulse voltage signal, the pulse voltage signal is conducted through the bolt piece to generate a vibration signal, the second piezoelectric film sensor is configured as a signal receiving sensor and is used for receiving the vibration signal, the time difference between the excitation signal and the received signal is acquired through an external data acquisition device, the flight time of the vibration signal transmitted inside the bolt piece is obtained, and the bolt pretightening force is obtained;
the first film piezoelectric sensor array is used for exciting pulse voltage signals, the pulse voltage signals are conducted to form lamb wave signals through the periphery of the threaded holes of the laminated plate, and the second film piezoelectric sensor array is used for receiving the lamb wave signals so as to detect the received lamb wave signals through an external detection chip to obtain damage conditions around the threaded holes.
Optionally, the first thin film piezoelectric sensor array and the second thin film piezoelectric sensor array are electrically connected with a ring electrode as a positive electrode, and the first mounting gasket and the second mounting gasket are configured as a negative electrode.
Alternatively, the ring electrode includes a polyimide film substrate and an electroplated copper wire disposed on the polyimide film substrate.
Optionally, the polyimide film substrate has a thickness of 100 micrometers, and the copper wire has a thickness of 10 micrometers.
Optionally, the detection chip is an ADG708 chip.
Optionally, the first piezoelectric film sensor, the second piezoelectric film sensor, the first film piezoelectric sensor array and the second film piezoelectric sensor array comprise an AlCr alloy bonding layer, an AlCrN/AlScN nano piezoelectric coating and an AlCr alloy electrode which are sequentially stacked from inside to outside, wherein the AlCrN/AlScN nano piezoelectric coating is prepared by a method of combining a direct current magnetron sputtering technology with a plasma etching technology, and the AlCrN/AlScN nano piezoelectric coating is formed by alternately depositing a single-layer AlCrN film and a single-layer AlScN film.
Alternatively, the thickness of the single-layer AlCrN film and the single-layer AlScN film is 5-20 nanometers, and the thickness of the AlCrN/AlScN nano piezoelectric coating is 5-50 micrometers.
Optionally, the surface of the first thin film piezoelectric sensor array far away from the first mounting gasket and the surface of the second thin film piezoelectric sensor array far away from the second mounting gasket are respectively provided with a protection gasket.
Optionally, the protection gasket is subjected to a surface polishing treatment until the surface roughness of the protection gasket is less than 0.32 micrometers.
Optionally, the detection chip is electrically connected with a single chip microcomputer output pin, and the output pin is used for forming a high-low level state.
The application has the following beneficial effects:
1. the bolt pretightening force monitoring method is simple in structure, low in cost, and capable of avoiding repeated use of the same sensor and reducing signal interference through the piezoelectric film sensors at two ends. The signal acquisition and the data processing are simple, and the signal detection of the bolt array can be realized by matching with a multi-path data acquisition device.
2. The nanoscale piezoelectric film prepared by the method has the advantages of mature preparation process, wear resistance, high temperature resistance, adjustable piezoelectric performance and the like.
3. The hole periphery damage detection method of the perforated plate can monitor the structural health of the hole periphery in real time, and can detect and position cracks or matrix cracks
4 the bolt pretightening force monitoring and the hole circumference structure health monitoring are used in combination, so that the whole health monitoring of the hole plate connecting structure is realized. The method provided by the application can be combined with an intelligent skin or an intelligent sandwich structure to realize health monitoring of the overall structure of the composite material laminated plate.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a health monitor of a perforated plate and its bolting structure according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a nanoscale piezoelectric coating as disclosed in an embodiment of the present application;
FIG. 3 is a schematic view of a mounting washer disclosed in an embodiment of the present application;
fig. 4 is a schematic structural view of a ring electrode according to an embodiment of the present disclosure.
Wherein, the elements in the figure are identified as follows:
1-first piezoelectric film sensor, 2-bolt piece, 3-first protective washer, 4-first piezoelectric film sensor array, 5-first mounting washer, 6-first adhesive layer, 7-laminated board, 8-second adhesive layer, 9-second mounting washer, 10-second piezoelectric film sensor array, 11-second protective washer, 12-nut, 13-second piezoelectric film sensor, 14-polyimide substrate, 15-copper wire, 16-ring electrode, 101-AlCr alloy electrode, 102-AlCrN/AlScN nano piezoelectric coating, 103-AlCr alloy bonding layer.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
Referring to fig. 1 and 2, the detection device for a laminated plate with bolts disclosed in the embodiments of the present application is suitable for detecting the bolt pretightening force and/or damage around the bolt holes of the laminated plate with bolts 7, and the laminated plate with bolts 7 includes a laminated plate 7 with threaded holes and a bolt member 2 screwed into the threaded holes.
The practical significance of the bolt pretightening force implemented by the detection device and the damage detection around the threaded hole is that: by monitoring the hole perimeter health of the connection of each bolt member 2 in real time, the locations of relatively concentrated stresses in the bolted connection (e.g., an aircraft wing-to-body connection) can be analyzed. By structural optimization of the stress concentration (e.g., changing the size, number, or distribution of bolts), the safety and service life of the bolted laminate can be improved.
The detection device comprises:
a first piezoelectric thin film sensor 1 mounted on a first end of the bolt member 2;
a second piezoelectric thin film sensor 13 mounted on the second end of the bolt member 2;
the first sensor gasket assembly comprises a first mounting gasket 5 and a first piezoelectric film sensor array 4 which is covered on the sensing gasket and formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the first mounting gasket 5 is sleeved on the periphery of the first end of the bolt piece 2;
the second sensor gasket assembly comprises a second mounting gasket 9 and a second piezoelectric film sensor array 10 which is covered on the sensing gasket and is formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the second mounting gasket 9 is sleeved on the periphery of the second end of the bolt piece 2;
wherein the first piezoelectric film sensor 1 is configured as an active excitation sensor for exciting a pulse voltage signal, the pulse voltage signal is conducted through the bolt member 2 to generate a vibration signal, the second piezoelectric film sensor 13 is configured as a signal receiving sensor for receiving the vibration signal, so as to acquire a time difference between the excitation signal and the received signal through an external data acquisition device, obtain a flight time of the vibration signal transmitted inside the bolt member 2, and further obtain a bolt pretightening force, for example, f=k· (Δt- Δt) 0 ) Here, Δt is the signal acoustic time difference between the active excitation end and the signal receiving end, and F is the bolt pretightening force.
The first piezoelectric thin film sensor array 4 is configured to excite a pulse voltage signal, the pulse voltage signal is conducted through the outer periphery of the threaded hole of the laminated plate 7 to form a lamb wave signal, and the second piezoelectric thin film sensor array 10 is configured to receive the lamb wave signal, so as to detect the received lamb wave signal through an external detection chip to obtain a damage condition around the threaded hole.
The first piezoelectric film sensor 1 may be mounted to the first end of the screw member 2 through the first adhesive layer 6, and the second piezoelectric film sensor 13 may be mounted to the second end of the screw member 2 through the second adhesive layer 8.
It is easily conceivable that the first mounting washer 5 is pressed against the first end of the laminate 7 by the bolt member 2, since the first mounting washer 5 is sleeved on the outer circumference of the first end of the bolt member 2. Since the second mounting washer 9 is sleeved on the outer periphery of the second end of the bolt member 2, the second mounting washer 9 is pressed against the second end of the laminated plate 7 by the bolt member 2.
As for the bolt member 2, it may be formed by assembling a screw and a nut 12.
The above-mentioned "the first piezoelectric thin film sensor array 4 is formed by a plurality of thin film piezoelectric sensor units arranged in an annular space", and "the second piezoelectric thin film sensor array 10 is formed by a plurality of thin film piezoelectric sensor units arranged in an annular space", it is known that the thin film piezoelectric sensor units are fan-shaped as a whole. The number of the thin film piezoelectric sensor units may be 6 or other numbers. Based on the consideration that the positioning accuracy of the damage is improved and more signal data is generated, the number of sector areas can be increased by a person skilled in the art, and the hole circumference can be subdivided into more detection areas.
It is easy to understand that each of the thin film piezoelectric sensor units constituting the first piezoelectric thin film sensor array 4 corresponds to each of the thin film piezoelectric sensor units constituting the second piezoelectric thin film sensor array 10 in a one-to-one correspondence of signal pairs. That is, when one thin film piezoelectric sensor unit of the first piezoelectric thin film sensor array 4 generates an excitation pulse voltage signal, one thin film piezoelectric sensor unit for receiving the pulse voltage signal must exist to constitute the second piezoelectric thin film sensor array 10.
In order to be suitable for electrical connection between the first and second piezoelectric thin film sensor arrays 4 and 10 and the external detection member, the first and second piezoelectric thin film sensor arrays 4 and 10 are electrically connected to a ring electrode 16 as a positive electrode, and the first and second mounting washers 5 and 9 are configured as a negative electrode.
It is conceivable that the shape of the ring electrode 16 is constituted by a plurality of electrode units arranged in a ring shape, and that each electrode unit is electrically connected to each of the thin film piezoelectric sensor units of the first piezoelectric thin film sensor array 4, each of the thin film piezoelectric sensor units of the second piezoelectric thin film sensor array 10, respectively, at the same time, for example, by separate lead wires.
As an illustrative example, the above-described ring electrode 16 includes a polyimide substrate 14 and an electroplated copper wire 15 disposed on the polyimide substrate 14.
Here, the thickness of the polyimide substrate 14 is 100 micrometers, and the thickness of the copper wire 15 is 10 micrometers. A section of copper wire 15 is formed in a disc shape to increase the contact area with the piezoelectric film sensor, and the disc should be sized to be contained within a single sector area to prevent contact with the gasket base and thus short circuit. The other end of the copper wire 15 is formed into standard equally spaced leads for convenient connection to the flexible printed circuit interposer.
The electrical signals of each sector area can be obtained simultaneously by the multipath data acquisition device, and the detection chip is an ADG708 chip in order to prevent mutual interference between adjacent areas.
The specific operation method is as follows:
1. the high-frequency pulse signal generated by the signal generator is used for gating a certain channel through the ADG708 chip to apply pulse signals to single piezoelectric sensors in the piezoelectric film sensor array, and the multipath data acquisition device is used for detecting the voltage change of the corresponding piezoelectric sensors on the signal receiving gasket;
2. and the gating state of the ADG708 chip is controlled by using the high-low level state of the output pin of the singlechip. 6 areas are circularly selected through programming of a singlechip, and lamb wave signals in the areas are detected.
3. To prevent interference caused by lamb wave signals generated by the previous sensor on measurement of the next sensor signal, the time interval for replacing the channel of the ADG708 should be increased appropriately, and when the attenuation of lamb wave signals generated by the previous sensor is approximately 0, the channel of the next signal excitation and signal receiving sensor is opened.
As an exemplary example, the first piezoelectric film sensor 1, the second piezoelectric film sensor 13, the first piezoelectric film sensor array 4, and the second piezoelectric film sensor array 10 include an AlCr alloy bonding layer 103, an AlCrN/AlScN nano piezoelectric coating 102, and an AlCr alloy electrode 101 stacked in this order from inside to outside, wherein the AlCrN/AlScN nano piezoelectric coating 102 is prepared by a method of combining a direct current magnetron sputtering technique with a plasma etching technique, and the AlCrN/AlScN nano piezoelectric coating is formed by alternately depositing a single layer of AlCrN film and a single layer of AlScN film.
As one implementation, the thickness of the single-layer AlCrN film and the single-layer AlScN film is 5-20 nanometers, and the thickness of the AlCrN/AlScN nano piezoelectric coating 102 is 5-50 micrometers.
Before the piezoelectric film sensor is prepared, the upper end face and the lower end face of the bolt are etched by using a plasma etching technology, so that the surface roughness is reduced, and the adhesive force of the piezoelectric film sensor is improved.
It should be noted that adjusting the total thickness of the piezoelectric functional layer as well as the single-layer average thickness can improve its piezoelectric performance. A layer of AlCr alloy electrode 101 is deposited on the outer surface of the nanoscale piezoelectric coating, and a good conductive path is established between the AlCr alloy electrode and the annular electrode 16, so that the occurrence of a circuit breaking condition is avoided.
In a typical embodiment, the surface of the first piezoelectric film sensor array 4 facing away from the first mounting washer 5 and the surface of the second piezoelectric film sensor array 10 facing away from the second mounting washer are each provided with a protective washer.
Thus, by providing the protection washer, on the one hand, the wear of the bolt (or the nut 12) to the ring electrode 16 can be reduced, and the service life thereof can be improved. On the other hand, after the nut 12 is tightened, the ring electrode 16 can be sufficiently connected to the outer electrode of the piezoelectric thin film sensor array, preventing the occurrence of the disconnection phenomenon.
The protective gasket is subjected to surface polishing treatment until the surface roughness of the protective gasket is less than 0.32 micrometers.
Thus, the abrasion to the ring electrode 16 is reduced by the polishing treatment, so as to achieve the purpose of protecting the ring electrode 16. The polishing process may be a plasma technique.
The operational procedure of the detection of the present application will now be described for several common application scenarios. It should be noted that this common embodiment is not to be taken as a basis for understanding the essential characteristics of the technical problem to be solved by the claims of the present application, which are merely exemplary.
Example 1
Please refer to fig. 1. The detection device is used for detecting the pretightening force of the bolt member and specifically comprises the following steps:
the screw hole of the laminate 7 with the screw hole is provided with the bolt 2, the bottom end of the bolt is provided with the nut 2, and the two ends of the bolt 2 are provided with the first piezoelectric film sensor 1 and the nut 12.
A10 MHz high-frequency pulse signal is applied to the first piezoelectric film sensor 1 at the upper end of the bolt member 2 through a signal generator, and a vibration signal is generated inside the bolt member 2 due to the inverse piezoelectric effect of the piezoelectric material. The vibration signal propagates in the form of ultrasonic waves, and when reaching the bottom end of the bolt member 2, the second piezoelectric thin film sensor 13 at the bottom of the bolt member 2 generates a voltage change due to the positive piezoelectric effect of the piezoelectric material, and the electrical signal is detected by the data acquisition device. The time of flight of the vibration signal along the axial direction of the second piezoelectric film sensor can be obtained by comparing and analyzing the acoustic time difference between the input pulse signal and the acquired electrical signal, so as to obtain the magnitude of the axial load borne by the bolt 2, which is usually the magnitude of the pretightening force. The first piezoelectric film sensor 1 and the second piezoelectric film sensor 13 are used separately, so that the situation that the input end and the output end share one sensor is avoided, and mutual interference between signals is reduced. The signal acquisition device only needs to acquire voltage signals without adding ultrasonic detection equipment, so that data acquisition is simpler and more convenient.
Example 2
Please refer to fig. 1-4. The detection device is used for detecting the peripheral damage of the laminated plate as follows:
the screw member 2 is mounted in the screw hole of the laminate 7 with screw holes of the laminate 7 with holes, the screw member 2 with the first piezoelectric film sensor 1 at both ends, the first mounting washer 5 with the first piezoelectric film sensor array 4 at one end, the first protection washer 11 without sensor, the ring electrode 16 and the nut 12. The inner side of the first mounting washer 5 is adhered to the laminated plate 7, and a layer of piezoelectric film sensor array 4 is prepared on the outer side in the same manner as the first piezoelectric film sensor 1 of the bolt 2.
A method of combining a plasma etching technology and a magnetron sputtering technology is utilized, a layer of annular piezoelectric film sensor is firstly prepared at one end of a mounting gasket, then the annular sensor is cut into 6 identical sector areas by utilizing an etching technology, and a first piezoelectric film sensor array 4 and a second piezoelectric film sensor array 10 which are distributed in an annular way are formed, as shown in fig. 3.
The first mounting washer 5, the second mounting washer 9 are in turn divided into a signal excitation washer and a signal receiving washer. The signal excitation gasket is in one-to-one correspondence with the 6 sector areas of the signal receiving gasket, dividing the hole perimeter into 6 areas. The outside of the first mounting washer is connected to the ring electrode 16, serving as the positive electrode for the 6 sectors, and the washer base is the common negative electrode. When the nut 12 is screwed down, the annular electrode 16 is tightly attached to the first piezoelectric film sensor array, and the phenomenon of disconnection is avoided.
The ring electrode 16 is a flexible electrode, and a layer of copper wire 15 is electroplated on the polyimide film 14 which is a base material. In order to reduce the abrasion of the bolt piece 2 (or the nut 12) and the annular electrode 16 and improve the service life of the bolt piece, a layer of first protective washer 3 and a layer of second protective washer 11 are added between the annular electrode 16 and the bolt 2 (or the nut 12). The end surfaces of the first protective gasket 3 and the second protective gasket 11 are processed by a plasma etching technology, so that the surface roughness is greatly reduced, and the abrasion to the annular electrode is reduced. The gating state of the ADG708 chip is controlled by using the high-low level state of the output pin of the singlechip, and lamb wave signals in 6 areas are detected respectively, so that the capability of monitoring the damage and positioning around the hole in real time is realized.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application.
Claims (10)
1. The utility model provides a detection device of take bolt laminated plate, its characterized in that is suitable for detecting the damage around bolt pretightning force and the bolt hole of taking bolt laminated plate, this take bolt laminated plate including offer the laminated plate of screw hole and spiro union in threaded hole's bolt piece, detection device includes:
a first piezoelectric thin film sensor mounted at a first end of the bolt member;
the second piezoelectric film sensor is arranged at the second end of the bolt piece;
the first sensor gasket assembly comprises a first mounting gasket and a first film piezoelectric sensor array which is covered on the sensing gasket and formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the first mounting gasket is sleeved on the periphery of the first end of the bolt;
the second sensor gasket assembly comprises a second mounting gasket and a second film piezoelectric sensor array which is covered on the sensing gasket and formed by a plurality of film piezoelectric sensor units which are annularly arranged at intervals, and the second mounting gasket is sleeved on the periphery of the second end of the bolt;
the first piezoelectric film sensor is configured as an active excitation sensor and is used for exciting a pulse voltage signal, the pulse voltage signal is conducted through the bolt piece to generate a vibration signal, the second piezoelectric film sensor is configured as a signal receiving sensor and is used for receiving the vibration signal, the time difference between the excitation signal and the received signal is acquired through an external data acquisition device, the flight time of the vibration signal transmitted inside the bolt piece is obtained, and the bolt pretightening force is obtained;
the first film piezoelectric sensor array is used for exciting pulse voltage signals, the pulse voltage signals are conducted to form lamb wave signals through the periphery of the threaded holes of the laminated plate, and the second film piezoelectric sensor array is used for receiving the lamb wave signals so as to detect the received lamb wave signals through an external detection chip to obtain damage conditions around the threaded holes.
2. The inspection apparatus for a bolted laminate as claimed in claim 1, wherein said first array of thin film piezoelectric transducers and said second array of thin film piezoelectric transducers are electrically connected with a ring electrode as a positive electrode, and wherein said first mounting washer and said second mounting washer are configured as a negative electrode.
3. The inspection apparatus of a bolted laminate as claimed in claim 2, wherein said ring electrode comprises a polyimide film substrate and electroplated copper wire disposed on the polyimide film substrate.
4. The inspection apparatus for a bolted laminate as claimed in claim 3, wherein said polyimide film substrate has a thickness of 100 μm and copper wire has a thickness of 10. Mu.m.
5. The inspection device of a bolted laminate as claimed in claim 1, wherein said inspection chip is an ADG708 chip.
6. The device for inspecting a bolted laminated board according to claim 1, wherein the first piezoelectric thin film sensor, the second piezoelectric thin film sensor, the first thin film piezoelectric sensor array, and the second thin film piezoelectric sensor array comprise an AlCr alloy bonding layer, an AlCrN/AlScN nano piezoelectric coating and an AlCr alloy electrode which are stacked in sequence from inside to outside, wherein the AlCrN/AlScN nano piezoelectric coating is prepared by a method of combining a direct current magnetron sputtering technology with a plasma etching technology, and the AlCrN/AlScN nano piezoelectric coating is formed by alternately depositing a single layer of AlCrN thin film and a single layer of AlScN thin film.
7. The device for inspecting a bolted laminated board according to claim 6, wherein the single-layer AlCrN film and the single-layer AlScN film have a thickness of 5 to 20 nm, and the AlCrN/AlScN nano-piezoelectric coating has a thickness of 5 to 50 μm.
8. The device for inspecting a bolted laminate according to claim 1, wherein the surface of the first array of thin film piezoelectric sensors remote from the first mounting gasket and the surface of the second array of thin film piezoelectric sensors remote from the second mounting gasket are each provided with a protective gasket.
9. The inspection apparatus for bolted laminates as claimed in claim 8, wherein said protective washers are surface polished until their surface roughness is less than 0.32 microns.
10. The device for detecting the laminated board with the bolts according to claim 1, wherein the detecting chip is electrically connected with an output pin of the single chip microcomputer, and the output pin is used for forming a high-low level state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310423158.9A CN116539208A (en) | 2023-04-19 | 2023-04-19 | Detection device for laminated plate with bolts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310423158.9A CN116539208A (en) | 2023-04-19 | 2023-04-19 | Detection device for laminated plate with bolts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116539208A true CN116539208A (en) | 2023-08-04 |
Family
ID=87455287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310423158.9A Pending CN116539208A (en) | 2023-04-19 | 2023-04-19 | Detection device for laminated plate with bolts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116539208A (en) |
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2023
- 2023-04-19 CN CN202310423158.9A patent/CN116539208A/en active Pending
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