CN104567944B - Integrated large-area flexible piezoelectric interlayer sensor network - Google Patents
Integrated large-area flexible piezoelectric interlayer sensor network Download PDFInfo
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- CN104567944B CN104567944B CN201410813053.5A CN201410813053A CN104567944B CN 104567944 B CN104567944 B CN 104567944B CN 201410813053 A CN201410813053 A CN 201410813053A CN 104567944 B CN104567944 B CN 104567944B
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Abstract
The invention discloses an integrated large-area flexible piezoelectric interlayer sensor network, and belongs to the technical field of aviation structure health monitoring. The integrated large-area flexible piezoelectric interlayer sensor network is implemented by the following steps: (1) designing a plurality of functional interlayers which comprise piezoelectric sensing elements and integrated interfaces according to a monitoring position, a monitoring object and a monitoring method of a structure; (2) designing an interface interlayer according to the shape of the integrated interface of each functional interlayer and the structural form of each interlayer, wherein the interface interlayer is used for integrating various functional interfaces and realizes the unified input/output of sensing signals of the overall network; (3) integrating all functional interlayers and the interface interlayer to form the integrated large-area flexible piezoelectric interlayer sensor network which can effectively cover the monitoring range of the structure. According to the integrated large-area flexible piezoelectric interlayer sensor network, the lead wire layout of a piezoelectric sensor network in a large-size structure health monitoring application can be simplified; the weight of lead wires is reduced; the accuracy and the consistency of piezoelectric sensing signals can be simplified; therefore, the integrated large-area flexible piezoelectric interlayer sensor network has a very good application prospect.
Description
Technical field
The present invention relates to a kind of integrated large area flexible piezoelectric interlayer sensing network, belong to aeronautic structure health monitoring
Technical field.
Background technology
Piezoelectric sensing element has the advantages that sensitivity height, working band width, dynamic range are big, in monitoring structural health conditions
Research in be widely used.Due to sensitive to Small loss such as crackle, delaminations, based on piezoelectric sensing element and Lamb wave
The structure health monitoring method of active and passive diagnostic techniquess is one of current the most effective technical method.Large scale is being tied
When structure implements large area monitoring, the piezoelectric sensing element generally requiring greater number is worked in the form of sensing network.However,
In laboratory research, sensor is arranged mostly manually, there is problems with practical application：Arrange piezoelectricity one by one
The method of sensing element is difficult to ensure that the consistent of each sensor performance, the side such as its stability, electrical characteristic and service life
Face is difficult to control to；Sensor lead is more, and especially for piezoelectric sensing element, it is operated under high frequency state it is necessary to make
With shielding line, independent lead, more lead impost can be caused；The arrangement efficiency of piezoelectric sensing element is low.
The proposition of piezoelectric SMART layer concept is that the solution of the problems referred to above provides good thinking, and its thought is by piezoelectricity
Sensing element is encapsulated in flexible printed circuit board according to certain technique, and replaces plain conductor line with printed wire, passes through
One signaling interface output, the smart layer with piezoelectric sensing element can be directly arranged in structure during use.Piezoelectricity intelligence
The advantage of energy interlayer is：1. ensure that the concordance that production technology affects on each sensor performance；2. the line of sensor is pre-
System exports eventually through a standard interface in sensing layer, simplifies the lead of sensor, reduces its impact to structure；
3. simplify the arrangement of piezoelectric sensing element, improve arrangement efficiency；4. different application objects can be directed to, to piezoelectric SMART layer
Form is designed.
The piezoelectric SMART layer adopting in monitoring structural health conditions application at present mainly assumes design single form, size relatively
The features such as Anti-interference Design that is little and only considering single interlayer.It is illustrated in figure 1 the schematic diagram of certain Conventional piezoelectric interlayer, this folder
Layer comprises 3 piezoelectric sensing elements and corresponding 3 bars circuits and 1 shared signal circuit, by one group of signaling interface
Output transducing signal.When health monitoring is carried out to structure, generally require using multiple routine interlayer dispersed placement, by a large amount of
The mode that lead is connected to monitoring system composition sensing network carries out health monitoring to structure.But in recent years, frame for movement, especially
It is that aeronautic structure constantly develops towards the direction of large scale, high complex form.The Sensor Network being constituted using above-mentioned networking mode
Network occurs problems with when carrying out health monitoring to large scale aeronautic structure：
（1）Difficult arrangement.There is the features such as size is big, version is complicated in modern Aviation structure, simultaneously in order to ensure to navigate
The aerodynamic characteristic of pocket, not in aeronautic structure outer surface placement sensor, can only be arranged in inside, so can bring and one be
Difficulty in row arrangement., sensor needs to be arranged in the inner surface of eyelid covering, so taking the damage monitoring of aircraft wing structure as a example
Often run into the versions such as beam, rib, stringer, reinforcement and screw hole.Sensor should avoid these knots in arrangement
Structure, can cover the region that on wing cover, these structures are located again, and the mode of single form interlayer and dispersed placement is difficult to
Meet at this 2 points simultaneously.Interlayer as shown in using Fig. 1 is arranged in the structure, may need when running into closed structure form to beat
Holding wire could be drawn in hole, and this does not often allow on aeronautic structure.
（2）Lead is complicated, impost is big.Above-mentioned COMPLICATED AIRCRAFT STRUCTURE form also can seriously hinder sensor lead in knot
Transmission in structure, such as when the version that the leads such as rib, closed area cannot directly pass through is existed on its bang path,
Lead can only detour or draw from opposite direction.In single interlayer networking monitoring, multiple interlayer dispersed placement both can increase sensing
The complexity of device lead arrangement, can make the wire length needing significantly elongated again.However, aircraft has to monitoring system weight
Very strict restriction, the weight of the lead that this arrangement needs is likely to be breached several kilograms, for aeronautic structure health monitoring
For be unacceptable.
Content of the invention
The present invention proposes a kind of integrated large area flexible piezoelectric interlayer sensing network, overcomes existing multiple single shape
Not enough present in the dispersion networking monitoring of formula interlayer, realize the integrated big face for large scale labyrinth health monitoring application
Long-pending flexible piezoelectric interlayer sensing network design, can simplify piezoelectric sensing network lead arrangement, fall while meeting application demand
Low lead weight, improves accuracy and the concordance of piezoelectric sensing signal.
The present invention is to solve its technical problem to adopt the following technical scheme that：
A kind of integrated large area flexible piezoelectric interlayer sensing network, comprises the steps：
（1）The monitoring method design function interlayer at monitoring position, monitoring object and employing according to structure, on this interlayer also
Comprise the integrated interface for forming large area flexible piezoelectric sensing network；
（2）Integrated interface shape further according to each function interlayer and sandwich form design interface interlayer, interface presss from both sides
Two kinds of interfaces are comprised on layer：Integrated interface and signal input output interface, wherein integrated interface are used for connecting each function interlayer, letter
Number input/output interface is used for realizing the unified input and output of the signal of whole network；
（3）Each function interlayer and interface interlayer are integrated, forming one being capable of effective covered structure monitoring range
Integrated large area flexible piezoelectric interlayer sensing network.
Described step（1）Middle function interlayer is to disclosure satisfy that structure each position monitoring requirements, comprise piezoelectric sensing element
Interlayer.
Described step（2）Middle interface interlayer be can connect, integrated each function interlayer and unify input and output network signal
Interlayer.
Described step（3）Middle function interlayer and the integrated of interface interlayer are realized by connecting the integrated interface of the two, adopt
Welding or the connected mode of conducting resinl.
Described step（3）Middle function interlayer and the integrated of interface interlayer are realized by connecting the integrated interface of the two, adopt
The directly connected mode of docking.
The invention has the advantages that：
（1）Multiple separate single interlayers are replaced with an integrated piezoelectric interlayer sensing network, network can a cloth
Put complete it is ensured that in network each piezoelectric sensing element performance concordance, and improve the arrangement efficiency of sensor.
（2）Flexible design, can simplify piezoelectricity and passes while meeting large scale labyrinth health monitoring application demand
Sense network lead arrangement, reduces lead weight.
Brief description
Fig. 1 is the exemplary plot of Conventional piezoelectric interlayer.
Fig. 2 is the composite material skin structure needing to carry out monitoring structural health conditions.
Fig. 3 is the schematic diagram of the integrated large area flexible piezoelectric interlayer sensing network for monitored structure design.
Fig. 4 is the schematic diagram of the function interlayer of single form.
Fig. 5 is the schematic diagram of the function interlayer of complex form.
Fig. 6 is the schematic diagram of interface interlayer.
Fig. 7 is integrated large area flexible piezoelectric interlayer sensing network arrangement schematic diagram in structure.
Fig. 8 is sensing network piezoelectric sensing element numbering and distribution schematic diagram.
In the mark of above-mentioned Fig. 1 to Fig. 8, mark 1 is interface interlayer；2 is the function interlayer of single form；3 is compound
The function interlayer of form；4 is signal input output interface；5 is piezoelectric sensing element；6 is piezoelectric sensing element positive pole in interlayer
Pad；7 is piezoelectric sensing element negative terminal pad in interlayer；8 is the signal line in interlayer；9 is the signal circuit in interlayer；10
Integrated interface for interface interlayer and function interlayer.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in detail.
Fig. 2 show the aircaft configuration position needing to carry out active damage monitoring and passive Impact monitoring.This position is one
Block area is 1000*1000mm2Composite material skin, eyelid covering vertically has 4 stringer, mutual spacing be 200mm；
There are two ribs in the horizontal direction, spacing is 400mm.This structure, in actual preparation process, prepares eyelid covering, length first respectively
Purlin and rib, then realize connecting by co-curing reaction.
Fig. 3 is to pass according to the integrated large area flexible piezoelectric interlayer that technical method provided by the present invention manufactures and designs
The schematic diagram of sense network, the area of network is 900*700mm2, comprise 33 piezoelectric sensing elements.Design process specifically include with
Lower step：
（1）Using the damage algorithm based on sparse piezoelectric sensor array, the composite material skin shown in Fig. 2 is carried out
Active damage monitoring in the range of total, based on intensive piezoelectric sensor array（Cross battle array）Im-pact location algorithm to this knot
Structure carries out passive Impact monitoring it is desirable to piezoelectric interlayer sensing network can cover total to greatest extent.Therefore set first
2 kinds of interlayers as shown in Fig. 4 to Fig. 5 are counted：The function interlayer 2 of single form and the function interlayer 3 of complex form.Then, then
The signaling interface of the function interlayer 3 of the function interlayer 2 according to single form and complex form and sandwich form design as
Interface interlayer 1 shown in Fig. 6.Above-mentioned 3 kinds of interlayers all comprise integrated interface 10, and wherein interface interlayer 1 does not comprise piezoelectric sensitivity unit
Part, the function interlayer 2 of single form has 5 piezoelectric sensing elements, for building sparse piezoelectric sensor array；Complex form
Two parts piezoelectric sensing element composition cross battle array being comprised on function interlayer 3 and forming Sparse Array, totally 13.In integrated piezoelectric folder
During layer sensing network, the number respectively 1,4 and 1 that 3 kinds of interlayers adopt.
（2）All of signal line and signal circuit on the function interlayer 3 of the function interlayer 2 of single form and complex form
Finally it is all connected on interface interlayer 1.Also reserve on interface interlayer 1 and can connect whole signal lines and signal circuit in network
Input/output interface 4.In this example, sensing network unifies all sensings of input and output using the general integrated signaling interface of DB44-K
The driving of device and response signal, can meet Web vector graphic demand.
（3）Welding manner is adopted by the function interlayer 2 of 4 single forms and the function of 1 complex form in the present embodiment
Interlayer 3 is integrated on interface interlayer 1 by respective integrated interface 10 respectively, integrated large area flexible piezoelectric interlayer Sensor Network
Network manufactures and designs and completes, and its arrangement schematic diagram on Fig. 2 stressed-skin construction is as shown in fig. 7, the thickness of wherein interlayer itself only has
0.1mm, very easily can be arranged in the middle of two interconnective versions in assembling, the such as eyelid covering of in figure and rib
And eyelid covering and stringer.Fig. 8 forms Sparse Array for sensing network piezoelectric sensing element numbering and distribution schematic diagram, A1-A25, uses
In active damage monitoring is carried out to structure；B1-B9 forms cross battle array, for carrying out passive Impact monitoring to structure.This two groups of pressures
In electric sensitive element, A13 and B3 is same sensing element, and Sparse Array and cross battle array share.
Claims (3)
1. a kind of integrated large area flexible piezoelectric interlayer sensing network is it is characterised in that comprise the steps：
（1）According to the monitoring method design function interlayer monitoring position, monitoring object and employing of structure, described function interlayer is
The interlayer disclosure satisfy that structure each position monitoring requirements, comprising piezoelectric sensing element, this interlayer also comprises for forming big face
The integrated interface of long-pending flexible piezoelectric sensing network；
（2）Integrated interface shape further according to each function interlayer and sandwich form design interface interlayer, described interface folder
Layer is for can connect, integrated each function interlayer unify the interlayer of input and output network signal, interface interlayer comprises two kinds and connects
Mouthful：Integrated interface and signal input output interface, wherein integrated interface are used for connecting each function interlayer, signal input output interface
For realizing the unified input and output of the signal of whole network；
（3）Each function interlayer and interface interlayer are integrated by being connected the integrated interface of the two, forming one can have
The integrated large area flexible piezoelectric interlayer sensing network of effect covered structure monitoring range.
2. as claimed in claim 1 a kind of integrated large area flexible piezoelectric interlayer sensing network it is characterised in that：Described
Step（3）Middle function interlayer and the integrated connected mode using welding or conducting resinl of interface interlayer.
3. as claimed in claim 1 a kind of integrated large area flexible piezoelectric interlayer sensing network it is characterised in that：Described
Step（3）Middle function interlayer and the integrated connected mode using directly docking of interface interlayer.
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| CN113720878A (en) * | 2021-08-16 | 2021-11-30 | 中国飞机强度研究所 | Combined piezoelectric intelligent interlayer and connecting device thereof |
Citations (2)
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| CN102307428A (en) * | 2011-08-18 | 2012-01-04 | 南京航空航天大学 | Anti-electromagnetic interference piezoelectric interlayer |
| CN102636573A (en) * | 2012-04-23 | 2012-08-15 | 南京邮电大学 | Method for manufacturing piezoelectric interlinings |
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Patent Citations (2)
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| CN102307428A (en) * | 2011-08-18 | 2012-01-04 | 南京航空航天大学 | Anti-electromagnetic interference piezoelectric interlayer |
| CN102636573A (en) * | 2012-04-23 | 2012-08-15 | 南京邮电大学 | Method for manufacturing piezoelectric interlinings |
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| 压电-光纤综合结构健康监测系统的研究及验证;袁慎芳等;《航空学报》;20090228;第30卷(第2期);第348-351页 * |
| 基于压电阵列的飞机结构监测与管理系统研究;邱雷;《中国优秀博士学位论文全文数据库（电子期刊）工程科技Ⅱ辑》;20130915(第9期);摘要、第28-34、38、126页第2段 * |
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