CN203310808U - Acoustic sensor system for deck slab dynamic detection - Google Patents
Acoustic sensor system for deck slab dynamic detection Download PDFInfo
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- CN203310808U CN203310808U CN201320264569XU CN201320264569U CN203310808U CN 203310808 U CN203310808 U CN 203310808U CN 201320264569X U CN201320264569X U CN 201320264569XU CN 201320264569 U CN201320264569 U CN 201320264569U CN 203310808 U CN203310808 U CN 203310808U
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Abstract
The utility model discloses an acoustic sensor system for deck slab dynamic detection. The acoustic sensor system for deck slab dynamic detection comprises a stretching arm and at least two sensor devices; a cross-shaped stretching arm, or an annular stretching arm or a spherical stretching arm is used for the stretching arm; arrays of the sensor devices is connected to the stretching arm in a distributing manner. The acoustic sensor system for deck slab dynamic detection, provided by the utility model, is simple in structure, low in cost and convenient to transport and carry; the difficulty of signal collection of Rayleigh wave leakage can be solved through an air coupling microphone array technique for reflection and focusing by utilizing curve surfaces; the contact-free-type detection means is realized by using the acoustic sensors, namely, the sensors and a deck slab are not required to be in contact during the detection process, and favorable test signal data can be obtained; signals are concentrated by utilizing a curve surface reflection cover, and the signal to noise ratio of data is increased; the working performance of the deck slab can be analyzed by comprehensively utilizing vibration signals and acoustic signals, which are recognized by a pulse hammering method, and the slab damage generation is judged and the service life of the slab is estimated.
Description
Technical field
The utility model relates to the decking detection field, relates to the array type sensor device through topological optimization, relates in particular to a kind of acoustic transducer system for the detection of decking power.
Background technology
Found the state so far, a large amount of bridges has been built by China, and many bridges were used more than 40 years, were subjected to the impact of extraneous factor and human factor, needs regularly bridge structure to be carried out to health monitoring and Performance Evaluation.Common detection method relies on visual inspection exactly, but along with the building the reach of science, scholars recognize gradually current bridge structure take visually rank as main detection appraisal procedure unreliable.
More effectively detecting appraisal procedure is to carry out structure identification.Structure identification refers to that the model that utilizes the test figure verification carries out predicting with the structural response of parameter correlation.The normal form of structure identification is described to six steps of theory-test-decision-making comprehensively justifies, and it comprises: (1) sets up general conception by the observation structure object; (2) set up initial finite element model; (3) carry out structural experiment; (4) analyze, verify and set forth test data; (5) model checking and parameter identification; (6) utilize the model of verification to carry out decision-making and prediction.By controlled load test, bridge is identified, needed the support of expertise and substantial contribution, on this certain degree, limited the development based on the constructional aspect assessment of structure identification.
In the 3rd step of structure identification, the controlled experiments of bridge structure comprises static loading experiment, external impetus excitation test (FVT) or both combinations.The external drive test is a kind of powerful experimental tool, and it is also a kind of unique method that can access modal mass and Modal Flexibility.Different external impetus excitation test (FVT) methods comprise the test of eccentric mass vibrator, the electro-dynamic exciter test, and transient state discharges test, lax excitation of multiple reference points pulse hammer stimulating (MRIT) and step-by-step movement etc.Wherein, the MRIT technology can fast and effeciently be implemented on bridge, and can access repeatability high-quality frequency response function (FRF) preferably, therefore obtains numerous slip-stick artists and researcher's welcome.
From using at present the fullering tool of MRIT technology both at home and abroad, mainly contain hand-held power hammer and drop hammer two kinds.Hand-held power hammer is waved power hammer by the people and is applied excitation, easy and simple to handle, and shortcoming is that the hammer force that at every turn applies is difficult to guarantee identical, and hammer force is also less, and the impact that is subject to simultaneously hammer's use experience is larger.Drop hammer and to utilize the mass Vertical Free with tup to fall, impact structure surface and obtain the pulse hammer force.Can to be in harmonious proportion height of drop certain due to the mass quality, drops hammer and can produce the repeatably impact load of adjustable size.The Swedish hammer made as U.S. Model shop company is a kind of product of public offering.
In practice, the not very willing test that utilizes nondestructiving detecting means to carry out the reinforced concrete bridge deck plate of many slip-stick artists is because its test speed is too low, utilizes traditional touch sensor can produce inconsistent coupled problem.According to researching and analysing in the past, the power pulse of a standard is in the stress wave of air and concrete surface generation, there are auspicious Leibo and the sound wave of leakage to propagate in air, the auspicious Leibo of wherein leaking has the information of plate structure vibration and sound wave does not have, and traditional detection means can't be gathered the auspicious Leibo of the leakage of dispersing to collect a bit.Therefore a kind of effective method is to utilize contactless sensor, and the acoustic sensor of Air Coupling just in time meets this requirement.The acoustic sensor of Air Coupling is applicating adn implementing more reliably, rapidly and easily, is therefore adopted widely.Simultaneously, the camber reflection focalizer is carried out to the product approval design, can avoid extraneous environmental interference.The microphone acceptance point is arranged near the camber reflection focus, just the auspicious Leibo information acquisition of leaking can be obtained.Current achievement in research shows that its sensitivity of microphone of Air Coupling can directly contrast touch sensor, and it can measure the signal that frequency reaches 80kHz in theory.
Summary of the invention
Problem to be solved in the utility model is: overcome the deficiencies in the prior art, propose to utilize camber reflection to focus on the microphone array pick-up, can solve a kind of acoustic transducer system for the detection of decking power of inconsistent coupled problem and auspicious Leibo leakage problem.
The scheme that its technical matters that solves the utility model adopts is: a kind of acoustic transducer system for the detection of decking power, and it comprises extending arm and is attached to the sensor device on extending arm; Described sensor device has two at least; Described sensor device comprises camber reflection cover, PCB microphone acoustic sensor, touch sensor, the curved surface of camber reflection cover down, middle part connection PCB microphone acoustic sensor, the receiving end of PCB microphone acoustic sensor is in the focus position of curved surface, touch sensor be positioned at PCB microphone acoustic sensor under; PCB microphone acoustic sensor array distributes and is connected on extending arm.
Described extending arm is a kind of in the various topological shape extending arms such as cross extending arm, annular extension arm, ball-type extending arm.
Described touch sensor is acceleration transducer, displacement transducer or speed pickup.
Compared with prior art, the utility model is simple in structure, with low cost, transports easy to carry; The Air Coupling microphone array technology of utilizing camber reflection to focus on can solve a signals collecting difficult problem of leaking auspicious Leibo; Simultaneously, the microphone array that utilizes camber reflection to focus on carries out signals collecting and the processing of burst, can obtain good test signal data; Vibration signal and acoustic signal that comprehensive utilization pulse hammer striking is identified can be analyzed the serviceability of concrete slab, and the generation of the damage of judgement plate and the assessment in life-span; Use acoustic sensor, realized touchless detection means, namely in testing process, sensor does not need to contact with decking; The signal of acoustic sensor and touch sensor collection is contrasted and integrated use, make the signal fiduciary level higher; Utilize the camber reflection cover by set of signals, improved the signal to noise ratio (S/N ratio) of data.
The accompanying drawing explanation
Fig. 1 is the sensor device test philosophy figure that camber reflection focuses on;
Fig. 2 is annular array sensor construction schematic diagram of the present utility model;
Fig. 3 is cross sensor array structural representation of the present utility model;
Fig. 4 is ball array sensor construction schematic diagram of the present utility model.
Embodiment
Now by reference to the accompanying drawings and specific embodiment, the utility model is described in detail.
Embodiment 1
With reference to accompanying drawing 1, Fig. 2, the present embodiment comprise annular extension arm 41 and at least two sensor devices; Power hammer 39 is the hammer points that drop hammer, and is positioned at the center of annular extension arm 41, and sensor device is connected on annular extension arm 41.
Sensor device is comprised of camber reflection cover 36, PCB microphone acoustic sensor 37, touch sensor 38, the curved surface of camber reflection cover 36 down, middle part connection PCB microphone acoustic sensor 37, touch sensor 38 be positioned at PCB microphone acoustic sensor 37 under; Camber reflection cover 36 is bolted on annular extension arm 41, and PCB microphone acoustic sensor 37 is connected with camber reflection cover 36 by bnc interface or other interface types of attachment; Described touch sensor is acceleration transducer, speed pickup or displacement transducer.
With a plurality of microphones on annular extension arm 41, identify simultaneously the auspicious Leibo of the multiple spot signal of the leakage on the plate face, can, from single-point-excitation, obtaining the information of multiple spot, solve inconsistent coupled problem and auspicious Leibo leakage problem.
Embodiment 2
With reference to accompanying drawing 1, Fig. 3, the difference of the present embodiment and embodiment 1 is: described extending arm adopts cross extending arm 40, and all the other are substantially the same manner as Example 1.
Embodiment 3
With reference to accompanying drawing 1, Fig. 4, the difference of the present embodiment and embodiment 1 is: described extending arm adopts ball-type extending arm 42, and all the other are substantially the same manner as Example 1.
Concrete which kind of embodiment that adopts should combine to carry out with theoretical analysis analysis of experiments.
Claims (5)
1. acoustic transducer system detected for decking power, it comprises extending arm and is attached to the sensor device on extending arm, it is characterized in that: described sensor device has two at least; Described sensor device comprises camber reflection cover, PCB microphone acoustic sensor, touch sensor, the curved surface of camber reflection cover down, middle part connection PCB microphone acoustic sensor, the receiving end of PCB microphone acoustic sensor is in the focus position of curved surface, touch sensor be positioned at PCB microphone acoustic sensor under; PCB microphone acoustic sensor array distributes and is connected on extending arm.
2. a kind of acoustic transducer system for the detection of decking power according to claim 1, is characterized in that described extending arm is cross extending arm.
3. a kind of acoustic transducer system for the detection of decking power according to claim 1, is characterized in that described extending arm is the annular extension arm.
4. a kind of acoustic transducer system for the detection of decking power according to claim 1, is characterized in that described extending arm is the ball-type extending arm.
5. according to the described a kind of acoustic transducer system for the detection of decking power of claim 1-4 any one, it is characterized in that: described touch sensor is acceleration transducer, displacement transducer or speed pickup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320264569XU CN203310808U (en) | 2013-05-15 | 2013-05-15 | Acoustic sensor system for deck slab dynamic detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320264569XU CN203310808U (en) | 2013-05-15 | 2013-05-15 | Acoustic sensor system for deck slab dynamic detection |
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| CN203310808U true CN203310808U (en) | 2013-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320264569XU Expired - Fee Related CN203310808U (en) | 2013-05-15 | 2013-05-15 | Acoustic sensor system for deck slab dynamic detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887236A (en) * | 2015-12-16 | 2017-06-23 | 宁波桑德纳电子科技有限公司 | A kind of remote speech harvester of sound image combined positioning |
| CN112147219A (en) * | 2020-08-25 | 2020-12-29 | 中南大学 | Highway subgrade empty foundation array detection probe, detection system and detection equipment |
-
2013
- 2013-05-15 CN CN201320264569XU patent/CN203310808U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887236A (en) * | 2015-12-16 | 2017-06-23 | 宁波桑德纳电子科技有限公司 | A kind of remote speech harvester of sound image combined positioning |
| CN112147219A (en) * | 2020-08-25 | 2020-12-29 | 中南大学 | Highway subgrade empty foundation array detection probe, detection system and detection equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131127 Termination date: 20160515 |