CN207964226U - Large-scale component vibration shape detection device based on doppler optical displacement method - Google Patents
Large-scale component vibration shape detection device based on doppler optical displacement method Download PDFInfo
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- CN207964226U CN207964226U CN201721431199.9U CN201721431199U CN207964226U CN 207964226 U CN207964226 U CN 207964226U CN 201721431199 U CN201721431199 U CN 201721431199U CN 207964226 U CN207964226 U CN 207964226U
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Abstract
The large-scale component vibration shape detection device based on doppler optical displacement method that the utility model discloses a kind of, the device include：Collecting unit, for acquiring the displacement signal that large-scale component vibration generates by cordless, and displacement signal is converted into digital signal, then digital signal progress difference processing is obtained into acceleration signal, the vibration frequency information of the large-scale component is then obtained by time-frequency convert；The vibration frequency information of the large-scale component is finally sent to host computer unit.Host computer unit, the vibration frequency information after time-frequency convert sent for receiving the collecting unit, and the vibration frequency information is visualized by host computer procedure.It using the utility model, disclosure satisfy that large-span space structure carries out Doppler's dynamic test demand of structural modal test under O＆M state, to provide the fast simple detection means for meeting on-the-spot test, increase substantially the efficiency of large-scale component vibration shape detection.
Description
Technical field
The utility model is related to industry and the medium-and-large-sized component vibration shape detection technique of civil buildings, more particularly to one kind are non-contact
The large-scale component vibration shape detection device based on doppler optical displacement method.
Background technology
The vibration shape information of large-scale component, one as industry and the health monitoring of civil buildings large-scale component are extremely important
Payload data, using it is non-contact record in real time by the way of, to large-scale component it is follow-up use and reinforce have it is very important
Meaning.
Existing industry and civil buildings large-scale component vibration shape detection method, typically in the vibration shape test point of large-scale component
Position laying acceleration transducer, then describes the vibration information of large-scale component by the collected acceleration signal of sensor, from
And obtain the vibration shape information of large-scale component.
But above-mentioned existing detection method will inevitably face deployment cost height, laying point position selection is fixed, cloth
If defect of high cost.
Utility model content
In view of this, the main purpose of the utility model is to provide a kind of large-scale structures based on doppler optical displacement method
Part vibration shape detection device, with exploitation meet large-span space structure is carried out under O＆M state structural modal test Doppler move
Power testing requirement, and realize under complex environment, the vibration-testing of remote, non-contacting environmental values is carried out, is provided full
The fast simple detection means of sufficient on-the-spot test so as to increase substantially the efficiency of large-scale component vibration shape detection, and is realized
Industry and the detection of the civil buildings large-scale component vibration shape and the analysis assessment of subsequent component damage.
In order to achieve the above objectives, the technical solution of the utility model is realized in：
A kind of large-scale component vibration shape detection device based on doppler optical displacement method, including collecting unit and host computer list
Member；Wherein：
The collecting unit, for acquiring the displacement signal that large-scale component vibration generates by cordless, and will
Institute's displacement signal is converted to digital signal, then the digital signal is carried out difference processing and obtains acceleration signal, then
The vibration frequency information of the large-scale component is obtained by time-frequency convert；Finally, by the vibration frequency information of the large-scale component
It is sent to host computer unit；
Host computer unit, the vibration frequency information after time-frequency convert sent for receiving the collecting unit, and
The vibration frequency information is visualized by host computer procedure.
Wherein, the collecting unit, including laser range finder, analog-digital converter, video conversion module and for providing
The power module of operating voltage；
The laser range finder, the vibration displacement letter for acquiring large-scale component by the cordless of laser ranging
Breath forms shift simulation signal；
The analog-digital converter, for collected shift simulation signal to be converted to displacement digital signal；
The time-frequency convert module obtains acceleration signal, through time-frequency for carrying out difference processing to displacement digital signal
It is converted to the vibration frequency information of large-scale component.
Wherein, the collecting unit further includes digital filtering module, for being filtered to displacement digital signal, with
Filter out the interference signals such as noise.
Time-frequency convert module carries out difference processing for the displacement digital signal to filtered processing, obtains acceleration
Signal obtains the vibration frequency information of large-scale component through time-frequency convert.
The power module is capable of providing the voltage of ± 5V/ ± 12V/ ± 24V.
The laser range finder, precision are grade, and resolution ratio is 0.1 millimeter.
The host computer unit includes processor, memory module and display；Can by processor by above-mentioned pass through when
Frequently in transformed vibration frequency information storage to memory module.
The large-scale component vibration shape detection device based on doppler optical displacement method of the utility model has following beneficial to effect
Fruit：
1) use the large-scale component vibration shape detection device, compared to using traditional acceleration transducer testing result,
Vibration shape inspection is carried out to large-scale component based on the large-scale component vibration shape detection device of doppler optical displacement method using the utility model
It surveys, is not only able to realize the vibration mode test purpose for carrying out remote non-contacting environmental values under complex environment, and there is cloth
Setting up an office, position is flexible, deployment cost is low, vibration shape detection efficiency is high, and has higher accuracy of detection.
2) the large-scale component vibration shape detection device of the utility model, additionally it is possible to divide applied to subsequent component damage
Analysis assessment.
Description of the drawings
Fig. 1 is the principle of large-scale component vibration shape detection device of the utility model embodiment based on doppler optical displacement method
Schematic diagram；
Fig. 2 is the process schematic that Doppler's vibration-testing is carried out using the detection device of the large-scale component vibration shape shown in Fig. 1；
Fig. 3 is that the utility model embodiment is obtained by the large-scale component vibration shape detection method based on doppler optical displacement method
The frequency spectrogram arrived.
Specific implementation mode
Below in conjunction with the accompanying drawings and the embodiments of the present invention to the utility model based on the big of doppler optical displacement method
Type component vibration shape detection device is described in further detail.
Fig. 1 is the principle of large-scale component vibration shape detection device of the utility model embodiment based on doppler optical displacement method
Schematic diagram.
As shown in Figure 1, the large-scale component vibration shape detection device based on doppler optical displacement method includes mainly acquisition
Unit and host computer unit.
1) collecting unit described in, for acquiring the displacement signal that large-scale component vibration generates by cordless, and
Institute's displacement signal is converted into digital signal, then the digital signal is subjected to difference processing and obtains acceleration signal, so
The vibration frequency information of the large-scale component is obtained by time-frequency convert afterwards.Finally, then by the vibration frequency of the large-scale component
Information is sent to host computer unit.
Large-scale structure in the large-scale component, including but not limited to civil building, industrial building, Longspan Bridge
Part, such as rack, truss, steel column, crane girder.
In the utility model embodiment, the collecting unit, specifically include laser range finder, modulus (A/D) converter,
Video conversion module and power module.Wherein：
The laser range finder, the vibration displacement letter for acquiring large-scale component by the cordless of laser ranging
Breath forms shift simulation signal.By the way of laser ranging, can to large-scale component vibrate generate micro-displacement information into
Row monitoring, therefore can ensure the precision of displacement information.The laser range finder that the utility model uses, precision is up to millimeter (mm)
Grade, resolution ratio is up to 0.1mm.
Modulus (A/D) converter, for collected shift simulation signal to be converted to displacement digital signal.
Preferably, the collecting unit further includes digital filtering module.The digital filtering module, for displacement number
Signal is filtered, to filter out the interference signals such as noise.
The time-frequency convert module, it is poor to be carried out for the displacement digital signal to displacement digital signal/filtered processing
Divide processing, obtains acceleration signal, the vibration frequency information of large-scale component is obtained through time-frequency convert.
The power module is capable of providing the voltage of ± 5V/ ± 12V/ ± 24V, for other work(for collecting unit
Energy module, as laser range finder, A/D converter, digital filtering module, time-frequency convert module provide operating voltage.
2) host computer unit, the vibration frequency information after time-frequency convert sent for receiving the collecting unit,
And the vibration frequency information is visualized by host computer procedure.
The host computer unit, specifically includes processor, memory module and display.
Preferably, the host computer unit can be by processor by the above-mentioned vibration frequency information after time-frequency convert
It stores into memory module.
Fig. 2 is the process schematic that Doppler's vibration-testing is carried out using the detection device of the large-scale component vibration shape shown in Fig. 1.
As shown in Fig. 2, the test process mainly includes the following steps：
Step 21：By Doppler's vibration-testing, the displacement data x of monitoring site is obtainedi,j(time sequence matrix, i are detection
Point bit number, j are monitoring data time point).
The precision of existing laser range finder sensor can reach 1mm, and resolution ratio can reach 0.1mm.In the utility model reality
It applies in example, can sample frequency be set according to test requirements document, highest frequency acquisition can reach 100KHz.
Step 22：The displacement data is filtered.
Here, to xi,jIt is filtered, mainly for rejecting null value and bad value.
Step 23：To displacement data xi,jDifference processing twice is carried out, the acceleration signal of corresponding monitoring site is obtained
Acci,j。
The algorithm of the difference processing is as follows：
For i=1:m
Forj=1:n
Acci,j=(x (i+1)+x (i-1) -2*x (i))/h^2；
End
End.
Wherein, h is the sampling interval.
Step 24：To the difference acceleration signal f=Acci,jFast Fourier Transform (FFT) is carried out, corresponding frequency is obtained
Spectrogram, as shown in Figure 3.
Wherein：F (t) is acceleration signal, and ω is the frequency information of acceleration signal.
Step 25：The vibration shape that geodesic structure is treated using obtained frequency spectrogram is analyzed, and completes the state to structure
Assessment.
The assessment is that comparison procedure is as follows：
What existing method was obtained using acceleration transducer is acceleration-time graph；In the utility model embodiment
What doppler sensor measured is displacement-time curve, therefore a certain test result in the two is needed by transformation with convenient
It is compared.
Refer to the attached drawing 3 is analyzed from using the test result of above-mentioned detection method it is found that in the utility model method
The frequency test result of large-scale component, that is, subjects is：1st Frequency point is 8.116Hz, second frequency point is 17.21Hz, the 3rd
Frequency point is 30.76Hz.
Compared to traditional testing result using acceleration transducer, doppler optical position is based on using the utility model
The large-scale component vibration shape detection device of shifting method carries out vibration shape detection to large-scale component, is not only able to realize that progress is remote under complex environment
Vibration mode test purpose apart from non-contacting environmental values, and with laying, point is flexible, deployment cost is low, vibration shape detection effect
Rate is high, and has higher accuracy of detection.In addition, the large-scale component vibration shape detection device of the utility model, additionally it is possible to apply
In carrying out analysis assessment to subsequent component damage.
The above, the only preferred embodiment of the utility model, are not intended to limit the protection of the utility model
Range.
Claims (7)
1. a kind of large-scale component vibration shape detection device based on doppler optical displacement method, which is characterized in that including collecting unit
With host computer unit；Wherein：
The collecting unit, for acquiring the displacement letter that large-scale component vibration generates by the cordless of laser ranging
Number, and institute's displacement signal is converted into digital signal, then the digital signal is subjected to difference processing and obtains acceleration letter
Number, the vibration frequency information of the large-scale component is then obtained by time-frequency convert；Finally, by the vibration of large-scale component frequency
Rate information is sent to host computer unit；
Host computer unit, the vibration frequency information after time-frequency convert sent for receiving the collecting unit, and by institute
Vibration frequency information is stated to be visualized by host computer procedure.
2. the large-scale component vibration shape detection device based on doppler optical displacement method as described in claim 1, which is characterized in that institute
The collecting unit stated, including laser range finder, analog-digital converter, video conversion module and the power supply mould for providing operating voltage
Block；
The laser range finder, the vibration displacement information for acquiring large-scale component by the cordless of laser ranging, shape
At shift simulation signal；
The analog-digital converter, for collected shift simulation signal to be converted to displacement digital signal；
The time-frequency convert module obtains acceleration signal, through time-frequency convert for carrying out difference processing to displacement digital signal
Obtain the vibration frequency information of large-scale component.
3. the large-scale component vibration shape detection device based on doppler optical displacement method as claimed in claim 2, which is characterized in that institute
It further includes digital filtering module to state collecting unit, for being filtered to displacement digital signal, to filter out the interference of noise
Signal.
4. the large-scale component vibration shape detection device based on doppler optical displacement method, feature exist as described in Claims 2 or 3
In, time-frequency convert module carries out difference processing for the displacement digital signal to filtered processing, obtains acceleration signal,
The vibration frequency information of large-scale component is obtained through time-frequency convert.
5. the large-scale component vibration shape detection device based on doppler optical displacement method as claimed in claim 2, which is characterized in that institute
The power module stated is capable of providing the voltage of ± 5V/ ± 12V/ ± 24V.
6. the large-scale component vibration shape detection device based on doppler optical displacement method as claimed in claim 2, which is characterized in that institute
The laser range finder stated, precision are grade, and resolution ratio is 0.1 millimeter.
7. the large-scale component vibration shape detection device based on doppler optical displacement method as described in claim 1, which is characterized in that institute
It includes processor, memory module and display to state host computer unit；Can by processor by above-mentioned after time-frequency convert
In vibration frequency information storage to memory module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664565A (en) * | 2017-10-31 | 2018-02-06 | 中冶建筑研究总院有限公司 | Large-scale component vibration shape detection means and its method based on doppler optical displacement method |
| WO2020118130A1 (en) * | 2018-12-07 | 2020-06-11 | Itt Manufacturing Enterprises Llc | Embedded system for vibration detection and analysis |
| CN117168604A (en) * | 2023-09-04 | 2023-12-05 | 中冶建筑研究总院有限公司 | Doppler vectorization test method for structural vibration frequency |
-
2017
- 2017-10-31 CN CN201721431199.9U patent/CN207964226U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664565A (en) * | 2017-10-31 | 2018-02-06 | 中冶建筑研究总院有限公司 | Large-scale component vibration shape detection means and its method based on doppler optical displacement method |
| WO2020118130A1 (en) * | 2018-12-07 | 2020-06-11 | Itt Manufacturing Enterprises Llc | Embedded system for vibration detection and analysis |
| CN113272659A (en) * | 2018-12-07 | 2021-08-17 | Itt制造企业有限责任公司 | Embedded system for vibration detection and analysis |
| US11184690B2 (en) | 2018-12-07 | 2021-11-23 | Itt Manufacturing Enterprises Llc | Embedded system for vibration detection and analysis |
| CN117168604A (en) * | 2023-09-04 | 2023-12-05 | 中冶建筑研究总院有限公司 | Doppler vectorization test method for structural vibration frequency |
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