CN204389428U - A kind of encapsulation of the marble for monitoring structural health conditions piezoelectric sensor - Google Patents
A kind of encapsulation of the marble for monitoring structural health conditions piezoelectric sensor Download PDFInfo
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- CN204389428U CN204389428U CN201520075554.8U CN201520075554U CN204389428U CN 204389428 U CN204389428 U CN 204389428U CN 201520075554 U CN201520075554 U CN 201520075554U CN 204389428 U CN204389428 U CN 204389428U
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Abstract
The utility model discloses a kind of marble for monitoring structural health conditions encapsulation piezoelectric sensor, comprise round-shaped piezoelectric ceramic piece, scribble conductive coating respectively at the outer ring position of this piezoelectric ceramic piece rounded upper surface and rounded lower surface and inner circle position, the conductive coating of described outer ring position does not directly contact with the conductive coating of inner circle position; Connect wire to be connected with the conductive coating of described piezoelectric ceramic piece upper surface and the outer ring position of lower surface; Another connects wire and is connected with the conductive coating of described piezoelectric ceramic piece upper surface and lower surface inner circle position; Upper surface and the lower surface of this piezoelectric ceramic piece all scribble water barrier outward, and are positioned at the inside of marble encapsulation.This piezoelectric sensor piezoelectric sensor that can effectively solve for monitoring structural health conditions encapsulates the problem of length consuming time, and the packaging effect of piezoelectric sensor is good, weight bearing power is strong, can the support effect good to piezoelectric sensor be ensured, thus guarantee the measuring accuracy of piezoelectric sensor.
Description
Technical field
The utility model belongs to piezoelectric sensor field, more specifically, relates to a kind of marble for monitoring structural health conditions encapsulation piezoelectric sensor.
Background technology
Great civil engineering structure is dam, large-span space structure, high-rise building, Longspan Bridge etc. such as, and its health status is directly connected to the safety of people's lives and properties.And, along with China's economy and civilized development, various civil engineering construction is fast-developing with innovation, and large complicated, Super High and diversified engineering structure constantly occur, the normal operational relation of civil engineering work infrastructure is to the normal operation of national economy.These engineerings occupying critical role are reaching decades, even go up in century-old military service process, the coupling of the long-term effect of environmental attack, material aging, load, fatigue effect and various sudden factor (earthquake, typhoon, ice rain etc.), inevitably will cause structural damage, along with the increase gradually of Years Of Service, the continuous accumulation of damage, can reduce the strength and stiffness of structure, even destroy.In the recent decade, catastrophic failure both domestic and external emerges in an endless stream.In January, 1999, the Bifrost of Qijiang County, Chongqing City collapses, and cause 41 people to die, 14 people are injured; In February, 2004, the glass roof of Transvaal boat paradise, Moscow caves in suddenly, and cause people more than 40 dead, more than 110, people is injured; In August, 2007, the phoenix vehicular bridge of Xiangxi Phoenix County, collapsed with a loud crash at the completion eve, and cause more than 47 people dead, 22 people are severely injured.In order to reduce generation, the reduction economic loss of tragedy, an urgent demand carries out health monitoring and non-destructive tests to civil engineering structure and infrastructure.The health status of timely detection architecture, repairs in time to structure earlier damage, effectively can not only reduce maintenance cost, and can also extending structure serviceable life, ensures structure function.
Through studying accumulation for many years, normally utilize piezoelectric to realize monitoring structural health conditions at present, and carry out identification of damage by the micro nature change of monitoring of structures.Based in the monitoring structural health conditions of piezoelectric ceramics, the combination of piezoelectric patches and structure mainly contains adhesive type and flush type two kinds, can decide the combination of piezoelectric patches and agent structure according to the material characteristics of structure and the monitoring technology adopted.Piezoelectric Impedance Technology develops based on the positive inverse piezoelectric effect of piezoelectric.In Piezoelectric Impedance method, piezoelectric patches is used as driver and sensor.When structure occurs to damage, its mechanical impedance will change, but this change is difficult to obtain by directly testing, and utilizes the electromechanical coupling characteristics of piezoelectric, is indirectly reflected the change of tested structural mechanical impedance by the change of measuring its electrical impedance signal.To be pasted on body structure surface or imbed inside configuration piezoelectric apply AC field time, because inverse piezoelectric effect acting piezoelectric material will produce mechanical vibration, and drive produced vibratory response by geodesic structure.This response pass on piezoelectric, because direct piezo electric effect effect causes its electrical impedance signal intensity.When having a zero defect by comparative structure, the difference of measured electrical impedance signal, can judge its internal injury situation.
But in actual applications, because piezoelectric ceramic piece is more crisp, if directly by piezoelectric patches embedded concrete structure, very easily cause the damage of piezoelectric patches and lost efficacy in concrete structure construction process and maintenance processes.In addition, piezoceramic material has water absorption character, under making the humidity of piezoelectric patches or water environment, character easily occurs and changes, thus cause error.Therefore, in order to solve this difficult problem, before piezoelectric patches embedded concrete structure, just waterproof and encapsulation process must be carried out to it.Such as, based on concept (the Smart Materials and Structures of intelligent aggregate, 2007,16 (4): 959-968), in sand-cement slurry piezoelectric ceramic piece after waterproof enclosure being encapsulated in advance cydariform or pea gravel concreten fritter, again they are embedded in the middle of structure after maintenance a period of time.Like this, mortar surrounding layer or pea gravel concreten surrounding layer can play the effect of protection piezoelectric ceramic piece, and it can bear certain load action, well can merge again with main body xoncrete structure, plays the effect similar with true aggregate.But this packaged type, manufacture craft more complicated, more difficult in homogeneity between each intelligent aggregate of guarantee, and use sand-cement slurry or pea gravel concreten to encapsulate, and consider that its curing time is long, therefore for a long time consuming time.
Utility model content
For above defect or the Improvement requirement of prior art, the purpose of this utility model is to provide a kind of marble for monitoring structural health conditions to encapsulate piezoelectric sensor, wherein by improving the assembly of piezoelectric sensor and set-up mode, encapsulating material and method etc., the piezoelectric sensor that compared with prior art can effectively solve for monitoring structural health conditions encapsulates the problem of length consuming time, and the packaging effect of piezoelectric sensor is good, weight bearing power is strong, can the support effect good to piezoelectric sensor be ensured, thus guarantee the measuring accuracy of piezoelectric sensor.
For achieving the above object, according to an aspect of the present utility model, provide a kind of marble for monitoring structural health conditions encapsulation piezoelectric sensor, comprise round-shaped piezoelectric ceramic piece, it is characterized in that,
Scribble conductive coating respectively at the outer ring position of this piezoelectric ceramic piece rounded upper surface and rounded lower surface and inner circle position, the conductive coating of described outer ring position does not directly contact with the conductive coating of inner circle position;
The conductive coating of the outer ring position of described piezoelectric ceramic piece upper surface and lower surface be connected wire and connect;
Described piezoelectric ceramic piece upper surface is connected wire with the conductive coating of lower surface inner circle position with another and connects;
Upper surface and the lower surface of described piezoelectric ceramic piece all scribble water barrier outward, and are positioned at the inside of marble encapsulation.
As of the present utility model further preferably, described marble encapsulation comprise with the use of the first Dali cubic meter of stone block and open reeded second Dali cubic meter of stone block, described piezoelectric ceramic piece is arranged in the groove of described second Dali cubic meter of stone block.
By the above technical scheme that the utility model is conceived, compared with prior art, owing to have employed marble encapsulation, protection piezoelectric ceramic piece can be played, avoid piezoelectric patches damage and lost efficacy.By using marble, the piezoelectric patches after water-proofing treatment is encapsulated, after piezoelectric sensor after encapsulation is imbedded monitoring target, this marble encapsulated layer further by piezoelectric ceramic piece and ambient environment, can avoid the adverse effect to piezoelectric patches performance such as water vapor; Further, marmorean load performance is good, and the effect of its load effect and true aggregate is similar to; The stable physics and chemistry character of marble itself ensure that the stability of piezoelectric sensor in precision and signal response; The manufacture craft of marble encapsulated layer is simple, convenient, only needs, by marble polishing fluting, to form the shape matched with piezoelectric ceramic piece and wire thereof, greatly can save the molding time of encapsulation, reduce the packaging cost of piezoelectric patches.In addition, water barrier (such as, epoxy resin water barrier) can also be avoided producing short circuit phenomenon when applying voltage to piezoelectric ceramic piece.Conductive coating is coated respectively by the outer ring position on same a slice piezoelectric ceramic piece and inner circle position, decrease the usage quantity of piezoelectric sensor, not only maintain original piezoelectric effect performance of piezoelectric patches, and can also effectively prevent piezoelectric sensor from use damaging.
Accompanying drawing explanation
Fig. 1 is the structural representation before piezoelectric sensor encapsulation.
In figure, the implication of each annex mark is as follows: 1 is marble square, and 2 is piezoelectric patches outer shroud, and 3 for connecting wire, and 4 is piezoelectric patches inner circle, and 5 for connecting wire, and 6 for having groove marble square.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment 1
Fig. 1 is the relative position schematic diagram of each component of piezoelectric sensor before encapsulation.Piezoelectric sensor after encapsulation comprises piezoelectric patches, adhering with epoxy resin water barrier, connects wire, marble surrounding layer.During monitoring, piezoelectric patches outer shroud launched with external signal be connected by connecting wire 3, by connection wire 5, piezoelectric patches inner circle is connected with external signal acquiring system.The radius of piezoelectric ceramic wafer is 7mm, conductive coating is scribbled at the outer shroud place of this piezoelectric patches, also scribble conductive coating at the inner circle of this piezoelectric patches, the conductive coating at outer shroud place does not directly contact with the conductive coating of inner circle, and the gap of outer shroud conductive coating and inner circle conductive coating is about 1mm.As long as the material that conductive coating uses can realize conducting electricity, such as, conductive coating can be the silver coating of plating.
This manufacturing process being used for the marble encapsulation piezoelectric sensor of monitoring structural health conditions is as follows: the first step: by piezoelectric patches outer shroud 2 and the welding being connected wire 3, and by piezoelectric patches inner circle 4 and the welding being connected wire 5, makes piezoelectric sensor; Second step: make marble outsourcing square according to circular piezoelectric sheet with the shape size being connected wire, marble square 6 is chosen correct position recessing, for placing piezoelectric patches and being connected wire; 3rd step: open after reeded one side (comprising groove location and position of platform) smears one deck epoxy resin uniformly at marble square 6, piezoelectric patches surface also being scribbled epoxy resin is placed in groove, then marble square 1 is covered with, press marble surrounding layer gently, epoxy resin is fully contacted with upper and lower marble surface; 4th step: the piezoelectric sensor of above-mentioned process is placed in room temperature environment, after epoxy resin natural consolidation, namely obtains the piezoelectric sensor through marble encapsulation.
As shown in Figure 1, wire 3 and wire 5 are shielded conductor, all include two wires, are connected respectively with the upper and lower surface of piezoelectric ceramic wafer; The outsourcing screen layer of shielded conductor can be used for the interference of shielding external signal.Such as, the electrocoat of surperficial outer shroud position upper and lower with piezoelectric disc respectively, one end of two wires of wire 3 is connected, and the other end is launched with external signal and is connected; Corresponding, the electrocoat of surperficial inner circle position upper and lower with piezoelectric disc respectively, one end of two wires of wire 5 is connected, and the other end is connected with external signal acquiring system.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (2)
1., for a marble encapsulation piezoelectric sensor for monitoring structural health conditions, comprise round-shaped piezoelectric ceramic piece, it is characterized in that,
Scribble conductive coating respectively at the outer ring position (2) of this piezoelectric ceramic piece rounded upper surface and rounded lower surface and inner circle position (4), the conductive coating of described outer ring position does not directly contact with the conductive coating of inner circle position;
The conductive coating of the outer ring position of described piezoelectric ceramic piece upper surface and lower surface be connected wire (3) and connect;
Described piezoelectric ceramic piece upper surface is connected wire (5) with the conductive coating of lower surface inner circle position with another and connects;
Upper surface and the lower surface of described piezoelectric ceramic piece all scribble water barrier outward, and are positioned at the inside of marble encapsulation.
2. as claimed in claim 1 for the marble encapsulation piezoelectric sensor of monitoring structural health conditions, it is characterized in that, the encapsulation of described marble comprise with the use of the first Dali cubic meter of stone block (1) and open reeded second Dali cubic meter of stone block (6), described piezoelectric ceramic piece is arranged in the groove in described second Dali cubic meter of stone block (6).
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| CN201520075554.8U CN204389428U (en) | 2015-02-03 | 2015-02-03 | A kind of encapsulation of the marble for monitoring structural health conditions piezoelectric sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770653A (en) * | 2016-12-05 | 2017-05-31 | 大连理工大学 | It is a kind of to stack formula piezoelectric intelligent aggregate for concrete structure health monitoring |
| CN107024579A (en) * | 2017-06-06 | 2017-08-08 | 武汉科技大学 | A kind of early strong intellectual monitoring box of cement-based material |
| CN108872319A (en) * | 2018-03-27 | 2018-11-23 | 哈尔滨工业大学深圳研究生院 | A kind of corrosion sensor |
| CN109142521A (en) * | 2018-07-27 | 2019-01-04 | 南京理工大学 | Steel Bridge Deck water-proof tack coat monitoring device and method based on piezoelectric transducer |
| CN114441804A (en) * | 2020-11-02 | 2022-05-06 | 基斯特勒控股公司 | Acceleration sensor |
-
2015
- 2015-02-03 CN CN201520075554.8U patent/CN204389428U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770653A (en) * | 2016-12-05 | 2017-05-31 | 大连理工大学 | It is a kind of to stack formula piezoelectric intelligent aggregate for concrete structure health monitoring |
| CN106770653B (en) * | 2016-12-05 | 2024-02-20 | 大连理工大学 | Stacked piezoelectric intelligent aggregate for concrete structure health monitoring |
| CN107024579A (en) * | 2017-06-06 | 2017-08-08 | 武汉科技大学 | A kind of early strong intellectual monitoring box of cement-based material |
| CN108872319A (en) * | 2018-03-27 | 2018-11-23 | 哈尔滨工业大学深圳研究生院 | A kind of corrosion sensor |
| CN109142521A (en) * | 2018-07-27 | 2019-01-04 | 南京理工大学 | Steel Bridge Deck water-proof tack coat monitoring device and method based on piezoelectric transducer |
| CN114441804A (en) * | 2020-11-02 | 2022-05-06 | 基斯特勒控股公司 | Acceleration sensor |
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