CN211402250U - In-line acoustic emission and acceleration integrated piezoelectric sensor - Google Patents
In-line acoustic emission and acceleration integrated piezoelectric sensor Download PDFInfo
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- CN211402250U CN211402250U CN201922429410.9U CN201922429410U CN211402250U CN 211402250 U CN211402250 U CN 211402250U CN 201922429410 U CN201922429410 U CN 201922429410U CN 211402250 U CN211402250 U CN 211402250U
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Abstract
An in-line acoustic emission and acceleration integrated piezoelectric sensor belongs to the technical field of aerospace. In-line acoustic emission and acceleration integration piezoelectric sensor, including connection base, the connection base top is provided with electrically conductive base, electrically conductive base is provided with insulator foot and piezoelectric element, be provided with piezoelectric piece and piezoelectric piece down in the insulator foot, the top of going up the piezoelectric piece is provided with vibration conduction device, vibration conduction device passes through the spring and is connected with the casing, it passes through the conducting strip with piezoelectric piece down to go up the piezoelectric piece and connect, go up the upper surface of piezoelectric piece, the lower surface and the conducting strip of piezoelectric piece all are connected with the adapter through the wire down, piezoelectric element's upper surface and lower surface all are connected with the adapter through the wire. The in-line acoustic emission and acceleration integrated piezoelectric sensor saves installation space, reduces installation difficulty, realizes synchronous acquisition of vibration signals and acoustic emission signals, reduces errors of acquired data, and improves accuracy.
Description
Technical Field
The utility model relates to an aerospace technical field, in particular to in-line acoustic emission and acceleration integration piezoelectric sensor.
Background
In the field of aviation, fatigue caused by vibration of aircraft engines and some major parts can have a great influence on the service life of the aircraft engines, and therefore, in order to prolong the service life, signals of the mechanical parts about the mechanical vibration are generally required to be collected through a sensor for analysis. However, in the existing signal acquisition process, a single-function sensor is usually adopted to detect a certain index generated by vibration of the sensor, such as displacement, acceleration and the like, and if the required types and the number of the sensors are large in the information fusion online monitoring process, the used space and the acquisition resources are large, the synchronization performance is also influenced, and the installation difficulty, the occupation of a large amount of space and the increase of errors of the acquired data can be increased by installing a plurality of single-function sensors to acquire data.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that prior art exists, the utility model provides an in-line acoustic emission and acceleration integration piezoelectric sensor, it can the inside mechanical properties signal of simultaneous measurement material and acceleration signal, has saved installation space, has reduced the installation degree of difficulty, has reduced data collection's error, has improved the precision, has realized vibration signal and acoustic emission signal synchronous acquisition.
In order to realize the purpose, the technical scheme of the utility model is that:
an in-line acoustic emission and acceleration integrated piezoelectric sensor comprises a connecting base, a shell, a conductive base, an insulating base, an upper piezoelectric sheet, a lower piezoelectric sheet, a piezoelectric element and a vibration conduction device, wherein the shell is arranged on the connecting base;
the top of the connecting base is provided with a conductive base, the conductive base is provided with two mounting grooves, wherein one mounting groove is internally provided with an insulating base, an upper piezoelectric sheet and a lower piezoelectric sheet are arranged in the insulating base, the top of the upper piezoelectric sheet is provided with a vibration conduction device, the vibration conduction device is connected with a shell through a spring, and the shell is connected with the connecting base; a piezoelectric element is arranged in the other mounting groove;
go up the piezoelectric patches and pass through the conducting strip with lower piezoelectric patches and connect, the upper surface of going up the piezoelectric patches, the lower surface and the conducting strip of lower piezoelectric patches all are connected with the adapter through the wire, piezoelectric element's upper surface and lower surface all are connected with the adapter through the wire.
The vibration conduction device adopts a mass block and is used for conducting vibration identical to that of the connecting base.
The depth of the two mounting grooves is the same.
The upper piezoelectric sheet and the lower piezoelectric sheet are both quartz piezoelectric sheets.
The bottom of the connecting base is provided with a connecting part for being connected with a detected component.
The utility model has the advantages that:
the utility model discloses can realize gathering twice to the produced vibration signal of same vibration, form the acceleration of same object vibration and the collection of the change of the inside performance of material, be equivalent to in-line acoustic emission sensor and piezoelectric acceleration sensor's combination, the error that brings when can greatly reduce the independent measurement reduces the degree of difficulty of a plurality of sensor installations simultaneously, has both guaranteed the measuring accuracy, has reduced the degree of difficulty when implementing the measurement again, has saved the space.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
Fig. 1 is a schematic structural diagram of an in-line acoustic emission and acceleration integrated piezoelectric sensor provided in an embodiment of the present invention;
fig. 2 is a top view of an in-line acoustic emission and acceleration integrated piezoelectric sensor provided by an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1-connection base, 2-shell, 3-conductive base, 4-insulating base, 5-upper piezoelectric plate, 6-lower piezoelectric plate, 7-piezoelectric element, 8-vibration conduction device, 9-conductive plate, 10-spring, 11-adapter and 12-connection part.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In order to solve the problems in the prior art, as shown in fig. 1 to 2, the utility model provides an in-line acoustic emission and acceleration integrated piezoelectric sensor, which comprises a connecting base 1, a shell 2, a conductive base 3, an insulating base 4, an upper piezoelectric sheet 5, a lower piezoelectric sheet 6, a piezoelectric element 7 and a vibration conduction device 8;
the top of the connecting base 1 is provided with a conductive base 3, the conductive base 3 is provided with two mounting grooves, wherein one mounting groove is internally provided with an insulating base 4, the insulating base 4 is internally provided with an upper piezoelectric sheet 5 and a lower piezoelectric sheet 6, the upper piezoelectric sheet 5 and the lower piezoelectric sheet 6 are both quartz piezoelectric sheets, the top of the upper piezoelectric sheet 5 is provided with a vibration conduction device 8, the vibration conduction device 8 adopts a mass block and is used for conducting the same vibration as the connecting base 1, the vibration conduction device 8 is connected with the shell 2 through a spring 10, and the shell 2 is connected with the connecting base 1; a piezoelectric element 7 is arranged in the other mounting groove;
go up piezoelectric patch 5 and lower piezoelectric patch 6 and pass through conducting strip 9 and connect, go up the upper surface of piezoelectric patch 5, the lower surface of lower piezoelectric patch 6 and conducting strip 9 and all be connected with adapter 11 through the wire, piezoelectric element 7's upper surface and lower surface all are connected with adapter 11 through the wire, and concrete connected mode is: the upper surface of the piezoelectric element 7 is connected with the adapter 11 through a lead, and the upper surface of the upper piezoelectric sheet 5 and the lower surface of the lower piezoelectric sheet 6 are connected through leads and then led out of the shell 2 through leads to be connected with the adapter 11; the lower surface of the piezoelectric element 7 is connected with the conducting strip 9 through a lead, and then the conducting strip is led out of the shell 2 through a lead and is connected with the adapter 11.
In this embodiment, the casing 2 is a metal shell, the connection base 1 is engaged with the casing 2, the bottom of the connection base 1 is provided with a connection portion 12 for connection with a detected component, the connection portion 12 can be a bolt hole for fixing to a vibrating member, vibration of the vibrating member is transmitted to the piezoelectric sheet and the piezoelectric element 7 above through the connection portion 12, and the piezoelectric element 7 is made of PZT-5 material. Electrically conductive base 3 and connection base 1 fixed connection, the degree of depth of two mounting grooves of electrically conductive base 3 is the same, and of course, electrically conductive base 3 also can be realized through conducting resin, specifically includes: and paving conductive adhesive above the connecting base 1 to fix the insulating base 4 and the connecting base 1, enabling the piezoelectric element 7 to be flush with the bottom of the insulating base, enabling the piezoelectric element 7 to be in direct contact with the conductive adhesive, leading out the lower surface of the piezoelectric element 7 through a wire, and leading out the shell 2 together with the wire led out from the conducting strip 9 to be connected to the adapter 11.
The upper piezoelectric sheet 5 and the lower piezoelectric sheet 6 are connected in parallel, and when the upper surface of the upper piezoelectric sheet 5 and the lower surface of the lower piezoelectric sheet 6 are both anodes, the conducting sheet 9 arranged in the middle of the upper piezoelectric sheet is a cathode; when the upper surface of the upper piezoelectric plate 5 and the lower surface of the lower piezoelectric plate 6 are both negative electrodes, the conducting plate 9 arranged in the middle of the upper piezoelectric plate is a positive electrode; the positive and negative are alternated and are connected to the adapter 11 outside the shell 2 through a lead; the lower surface of the piezoelectric element 7 and the conducting strip 9 can be connected to an adapter 11 outside the shell 2 together through a lead, and the two are both anodes or both cathodes; the upper surface of the piezoelectric element 7 is connected to the adapter 11 through a lead, and the upper surface of the piezoelectric element 7, the upper surface of the upper piezoelectric sheet 5 and the lower surface of the lower piezoelectric sheet 6 are both anodes or both cathodes; in subsequent work, the adapter 11 can be connected with an amplifier and the like for signal processing, for example, multi-angle research and analysis can be performed on vibration characteristics, and transmission characteristics and mechanical characteristics of the structure can be optimized.
The utility model is used for gather vibration signal, be equivalent to in-line acoustic emission sensor and piezoelectric acceleration sensor's combination, because the two is different to the perception of vibration frequency, so vibration conduction device 8 passes through spring 10 and is connected with casing 2, vibration through spring 10 damping vibration conduction device 8.
The working principle of the in-line acoustic emission and acceleration integrated piezoelectric sensor is as follows:
when the utility model is used in practice, the piezoelectric element 7 is arranged on an object to be detected through the connecting part 12, and when the object to be detected vibrates, the acoustic emission stress wave generated by the mechanical vibration generated by vibrating parts such as an engine and the like in the material is converted into an electric signal to be output; the upper piezoelectric sheet 5, the lower piezoelectric sheet 6 and the conducting sheet 9 convert the vibration signal of the detected object into an electric signal to be output; piezoelectric element 7's upper surface, go up piezoelectric patch 5 and lower piezoelectric patch 6 and equally divide and be connected with adapter 11 respectively, piezoelectric element 7's lower surface and conducting strip 9 are connected to adapter 11 together, have realized gathering twice to same signal to the vibration signal who will gather turns into signal of telecommunication output, and the precision is higher, the error is littleer.
The acoustic emission is that when the material is deformed or cracked by external force or internal force, the phenomenon of releasing strain energy in the form of elastic wave, wherein a part of strain energy is released in the form of acoustic emission wave, the piezoelectric element 7 of the utility model converts the acoustic emission stress wave generated by the mechanical vibration generated by the vibration parts such as the engine in the material into an electric signal for output;
when the detected object vibrates, the vibration conduction device 8 has the same vibration along with the connection base 1 and is acted by the inertia force opposite to the acceleration direction, so that the vibration conduction device 8 has an alternating force proportional to the acceleration to act on the piezoelectric sheet, the piezoelectric effect of the piezoelectric sheet generates alternating charges on two surfaces, and when the vibration frequency is far lower than the natural frequency of the sensor, the output charges (voltage) of the sensor are proportional to the acting force, namely the acceleration of the detected object.
The output electric quantity can be further processed in subsequent work, for example, the output electric quantity is led out from the output end of the sensor and is input into the preamplifier, then the acceleration of the test piece can be measured by using a common measuring instrument, and for example, the vibration speed or the displacement of the test piece can be measured by adding a proper integrating circuit into the amplifier.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. An in-line acoustic emission and acceleration integrated piezoelectric sensor is characterized by comprising a connecting base, a shell, a conductive base, an insulating base, an upper piezoelectric sheet, a lower piezoelectric sheet, a piezoelectric element and a vibration conduction device, wherein the connecting base is connected with the shell;
the top of the connecting base is provided with a conductive base, the conductive base is provided with two mounting grooves, wherein one mounting groove is internally provided with an insulating base, an upper piezoelectric sheet and a lower piezoelectric sheet are arranged in the insulating base, the top of the upper piezoelectric sheet is provided with a vibration conduction device, the vibration conduction device is connected with a shell through a spring, and the shell is connected with the connecting base; a piezoelectric element is arranged in the other mounting groove;
go up the piezoelectric patches and pass through the conducting strip with lower piezoelectric patches and connect, the upper surface of going up the piezoelectric patches, the lower surface and the conducting strip of lower piezoelectric patches all are connected with the adapter through the wire, piezoelectric element's upper surface and lower surface all are connected with the adapter through the wire.
2. The in-line acoustic emission and acceleration integrated piezoelectric sensor of claim 1, wherein the vibration conducting means employs a mass for conducting the same vibration as the connection base.
3. The in-line acoustic emission and acceleration integrated piezoelectric sensor of claim 1, wherein the depth of both of the mounting grooves is the same.
4. The in-line acoustic emission and acceleration integrated piezoelectric sensor of claim 1, wherein the upper and lower piezoelectric patches are both quartz piezoelectric patches.
5. The in-line acoustic emission and acceleration integrated piezoelectric sensor of claim 1, wherein a bottom portion of the connection base is provided with a connection portion for connection of a detected member.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922429410.9U CN211402250U (en) | 2019-12-30 | 2019-12-30 | In-line acoustic emission and acceleration integrated piezoelectric sensor |
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| CN201922429410.9U CN211402250U (en) | 2019-12-30 | 2019-12-30 | In-line acoustic emission and acceleration integrated piezoelectric sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967402A (en) * | 2019-12-30 | 2020-04-07 | 沈阳航空航天大学 | In-line acoustic emission and acceleration integrated piezoelectric sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967402A (en) * | 2019-12-30 | 2020-04-07 | 沈阳航空航天大学 | In-line acoustic emission and acceleration integrated piezoelectric sensor |
| CN110967402B (en) * | 2019-12-30 | 2024-09-24 | 沈阳航空航天大学 | In-line acoustic emission and acceleration integrated piezoelectric sensor |
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