CN211426351U - Piezoelectric impedance monitoring system with temperature compensation function - Google Patents
Piezoelectric impedance monitoring system with temperature compensation function Download PDFInfo
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- 238000005259 measurement Methods 0.000 description 13
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- 238000009529 body temperature measurement Methods 0.000 description 4
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
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- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
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Abstract
The utility model relates to a piezoelectric impedance monitoring system with temperature compensation function, include: the piezoelectric sensor and the temperature sensor are arranged on the monitored structure; the electrical impedance measuring system is respectively connected with the piezoelectric sensor and the temperature sensor and is used for measuring electrical impedance signals of the piezoelectric sensor at different temperatures, acquiring resonance frequency offset serving as compensation parameters according to the electrical impedance signals and carrying out linear fitting on the resonance frequency offset; and the computer is connected with the electrical impedance measuring system and is used for storing and displaying the fitting function result. The utility model discloses can offset the influence of temperature, provide hardware system and solution for the application of piezoelectric impedance method structure health monitoring technique in outdoor large-scale structure, further improve the accuracy of judging by monitoring the structural damage state.
Description
Technical Field
The utility model belongs to the technical field of the healthy monitoring of piezoelectric impedance method structure, concretely relates to piezoelectric impedance monitoring system with temperature compensation function.
Background
The piezoelectric impedance method structure health monitoring technology is a structure health monitoring method developed at the end of the twentieth century. Compared with the traditional global damage detection technology based on modal analysis, the piezoelectric impedance technology has higher working frequency, generally above 30kHz, and small wave signal wavelength excited in the structure, so the piezoelectric impedance technology is very sensitive to the initial tiny damage of the structure and has very high detection sensitivity. The method does not depend on model analysis, can realize qualitative detection of damage on large-scale complex structures under the condition of not carrying out accurate modeling, and avoids the difficulty brought by high-frequency analysis. The lead zirconate titanate piezoelectric ceramic (PZT) sensor has the advantages of high sensitivity, high reaction speed, good long-term stability, large linear range and the like, can be used as a driver and a sensor at the same time, and is very suitable for on-line monitoring of large-scale complex structures. Meanwhile, the PZT sensor is light in weight, has small influence on the working performance of the main structure, and can be adhered to the surface of an in-service structure or embedded into a newly-built structure for health monitoring. At present, the piezoelectric impedance technology is successfully applied to the fields of aerospace, precision machinery, civil construction and the like, and has wide application prospects in structural fatigue damage monitoring research.
In the piezoelectric impedance method monitoring field of a large-scale structure, most of PZT sheets used as sensors are fixed on the surface of the monitored structure by adopting a surface pasting method, in the practical application process, firstly, the electrical impedance value of the PZT sensor is initially measured when the structure is in a normal non-damage state, then, the electrical impedance value of the PZT sensor is measured in different damage states, and the effect of detecting damage change can be achieved by comparing the deviation condition of the corresponding frequency of a resonance peak in an electrical impedance spectrum. The electrical impedance spectrum of a structure depends on the stiffness, mass and damping system of the structure. When the mass and the damping are kept unchanged, the shift of the resonance frequency of the structure directly reflects the change of the rigidity of the structure, and therefore, the shift of a resonance peak in an electrical impedance spectrum is an intrinsic parameter reflecting the change of materials. For a large structure, due to the change of the external environment temperature, the temperature change of the PZT sensor can inevitably occur in the working process, for example, the temperature fluctuates within the temperature range of-20 ℃ to 40 ℃, along with the rise of the temperature, the dielectric constant and the piezoelectric coefficient of the PZT sensor can be increased, so that the change of the output electrical impedance signal of the PZT sensor at different temperatures is caused, which is shown in that the corresponding frequency of a resonance peak in an electrical impedance spectrum is deviated, and the deviation condition can be superposed into the deviation of the resonance peak caused by the damage of the monitored structure, so that the judgment of whether the monitored structure is damaged or not is interfered.
The conventional general structural health monitoring device adopting the piezoelectric impedance method is a commercial impedance analyzer (such as WK6500B) which does not have temperature detection and compensation functions, and electrical impedance signals measured at different temperatures are poor in comparability, so that misjudgment of a final monitoring result is easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's not enough, provided a piezoelectric impedance monitoring system and method with temperature compensation function, added the electrical impedance measurement system with the temperature measurement function, provided a frequency offset's compensation method, can offset the influence of temperature, provide hardware system and solution for the application of piezoelectric impedance method structure health monitoring technique in outdoor large-scale structure.
For solving one of above-mentioned technical problem at least, the utility model discloses the technical scheme who takes is:
the utility model provides a piezoelectric impedance monitoring system with temperature compensation function, include:
the piezoelectric sensor and the temperature sensor are arranged on the monitored structure;
the electrical impedance measuring system is respectively connected with the piezoelectric sensor and the temperature sensor and is used for measuring electrical impedance signals of the piezoelectric sensor at different temperatures, acquiring resonance frequency offset serving as compensation parameters according to the electrical impedance signals and carrying out linear fitting on the resonance frequency offset;
and the computer is connected with the electrical impedance measuring system and is used for storing and displaying the fitting function result.
Further, the electrical impedance measurement system comprises: the piezoelectric sensor comprises a signal measuring module, a main control module, a power supply module and a serial port communication module, wherein the signal measuring module is respectively connected with the piezoelectric sensor and the temperature sensor, the main control module is connected with the signal measuring module and used for linear fitting, and the power supply module is connected with the serial port communication module.
Further, the specific steps of the linear fitting include: selecting any electrical impedance signal with a resonance peak as a fitting reference, respectively measuring the corresponding frequency of the resonance peak of the measured electrical impedance signal at different temperatures, calculating the difference value between the corresponding frequency of the resonance peak of the electrical impedance signal at different temperatures and the corresponding frequency of the resonance peak of the electrical impedance signal corresponding to the fitting reference, namely the resonance frequency offset, and performing linear fitting on the resonance frequency offset to obtain a fitting function result by taking the measured temperature as an independent variable x and the resonance frequency offset as a dependent variable y.
Furthermore, the computer is connected with the main control module through the serial port communication module.
Furthermore, piezoelectric sensor and temperature sensor pass through powerful sticky the structural being monitored, just temperature sensor is close to piezoelectric sensor sets up.
Further, the piezoelectric sensor is a PZT sensor.
The beneficial effects of the utility model include at least: the utility model provides a piezoelectric impedance monitoring system and method with temperature compensation function, resonant peak offset are used for judging whether appear the main index of damage by the monitored structure in the PZT sensor electrical impedance spectrum, and different test temperature can exert an influence to the electrical impedance spectrum of PZT sensor, especially can appear the skew of resonant peak corresponding frequency, and then influence the judgement of structure health status. The utility model discloses add the electrical impedance measurement system with the temperature measurement function, provide a frequency offset's compensation method, can offset the influence of temperature, further improve to the accuracy of judging by monitoring the structural damage state, provide hardware system and solution for the application of piezoelectric impedance method structure health monitoring technique in outdoor large-scale structure.
Drawings
Fig. 1 is a block diagram of the piezoelectric impedance monitoring system of the present invention.
Fig. 2 is the utility model discloses a by the structural schematic diagram of monitor sample.
FIG. 3 is a diagram of the measurement result of the electrical impedance at 25-32kHz frequency band at different testing temperatures.
Fig. 4 is a frequency diagram corresponding to the resonance peak of the 25-32kHz frequency band at different testing temperatures.
Fig. 5 is a graph of the frequency offset and the fitting result of the resonance peak of the 25-32kHz frequency band at different testing temperatures of the present invention.
FIG. 6 is a diagram of the measurement result of the electrical impedance of the 32-38kHz frequency band at different testing temperatures.
Fig. 7 is a frequency diagram corresponding to the resonance peak of the 32-38kHz frequency band at different testing temperatures.
Fig. 8 is a graph of the frequency deviation of the resonance peak of the 32-38kHz frequency band and the fitting result at different testing temperatures of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
Example 1: the utility model provides a piezoelectric impedance monitoring system with temperature compensation function, figure 1 is the utility model discloses piezoelectric impedance monitoring system's block diagram, it is shown with reference to figure 1, specifically include: computers, electrical impedance measurement systems, piezoelectric sensors, and temperature sensors.
Wherein, piezoelectric sensor and temperature sensor pass through powerful sticky subsides and are in monitored structural, just temperature sensor is close to piezoelectric sensor sets up, is used for detecting near piezoelectric sensor's temperature.
The electrical impedance measurement system mainly comprises: the device comprises a signal measurement module, a main control module, a power supply module and a serial port communication module, wherein the power supply module is connected with the serial port communication module, the signal measurement module is respectively connected with the piezoelectric sensor and the temperature sensor and used for measuring electrical impedance signals of the piezoelectric sensor at different temperatures, the main control module is connected with the signal measurement module and used for linear fitting, and the specific steps of the linear fitting comprise: the electrical impedance measurement system measures electrical impedance signals of the piezoelectric sensor at different temperatures, selects any electrical impedance signal with a resonance peak as a fitting reference, respectively measures the corresponding frequency of the resonance peak of the measured electrical impedance signal at different temperatures, calculates the difference value between the corresponding frequency of the resonance peak of the electrical impedance signal at different temperatures and the corresponding frequency of the resonance peak of the electrical impedance signal corresponding to the fitting reference, namely the resonance frequency offset, and performs linear fitting on the resonance frequency offset to obtain a fitting function result by taking the measured temperature as an independent variable x and the resonance frequency offset as a dependent variable y. The computer is connected with a main control module of the electrical impedance measurement system through the serial port communication module and is used for receiving, storing and displaying a fitting function result sent by the main control module, converting an actual electrical impedance measurement result by using the resonance frequency offset under different temperature conditions as a compensation parameter, obtaining an electrical impedance spectrum result corresponding to an original temperature and eliminating the influence of the temperature.
More specifically, the serial port communication module adopts a USB serial port, and plays roles in data transmission and power supply. Installing upper computer software written by LabVIEW language on a computer, wherein the software is used for recording an electrical impedance signal measurement result, recording corresponding test temperature when the electrical impedance signal is measured, and fitting a function result by resonance frequency offset transmitted in an electrical impedance measurement system, correcting a frequency axis by using the fitting function result, finally eliminating the influence of the test temperature on the frequency corresponding to a resonance peak, and storing a final test data result by adopting a txt format file.
According to the utility model discloses a this embodiment, different temperature conditions can be realized by the monitor structure with the help of the temperature control test box to the small-size, to the jumbo size structure, can realize with the help of noon and night temperature variation.
The concrete realization circuit structure of the above-mentioned component module of electrical impedance measurement system refers to chinese patent CN201910053602.6 "a hoist fatigue crack propagation monitoring facilities and method", signal measurement module mainly adopts the AD5933 chip, main control module mainly adopts 51 singlechips. The utility model discloses an improve on the basis of aforementioned patent: the temperature measurement and temperature compensation functions are added, a hardware realization and software fitting method of the temperature compensation function is introduced, and the technical problem that the change of the PZT sensor output electrical impedance signals at different temperatures is represented as the deviation of the corresponding frequency of a resonance peak in an electrical impedance spectrum, and the deviation condition can be superposed to the deviation of the resonance peak caused by the damage of a monitored structure to interfere the judgment of whether the monitored structure is damaged or not is solved.
Example 2: the utility model provides an utilize preceding piezoelectric impedance monitoring method of piezoelectric impedance monitoring system specifically includes following step:
s1, calibrating the PZT piezoelectric sensors at different temperatures: selecting a monitored sample, controlling an electrical impedance measuring system to measure electrical impedance signals of the piezoelectric sensor at different temperatures, selecting any electrical impedance signal with a resonance peak as a fitting reference, respectively measuring the corresponding frequencies of the resonance peaks of the measured electrical impedance signals at different temperatures, calculating the difference value between the corresponding frequencies of the resonance peaks of the electrical impedance signals at different temperatures and the corresponding frequencies of the resonance peaks of the electrical impedance signals corresponding to the fitting reference, namely the resonance frequency offset, performing linear fitting on the resonance frequency offset, taking the measured temperature as an independent variable x, and taking the resonance frequency offset as a dependent variable y to obtain a fitting function result;
s2, monitoring and compensating piezoelectric impedance: and controlling an electrical impedance measuring system to measure an electrical impedance signal of the piezoelectric sensor on an actual monitored structure, measuring the temperature near the piezoelectric sensor, sending the corresponding resonance frequency offset at the temperature to a computer, and converting according to a fitting function to obtain the electrical impedance signal corresponding to the original temperature.
The monitoring method of the present invention will be described with reference to specific examples.
Specific example 2.1:
s1, calibrating the PZT piezoelectric sensors at different temperatures:
s101, adopting the sample shown in the figure 2 as a monitored sample, wherein the material of the sample is 3A21H24 aluminum alloy, and the size of the sample is 100 × 20 × 3.2.2 mm3Two sides of the sample are connected through a middle arc, the length of the left side is 30.5mm, the radian of the middle part is R60mm, a square PZT piezoelectric sensor is pasted on the left side of the sample, and the size of the sensor is 10 × 10 × 1mm3A temperature sensor, in this example DS18B20, is attached near the PZT piezoelectric sensor.
S102, selecting a 25-32kHz frequency band as a monitoring frequency band, putting a detected sample into a temperature control test box, carrying out electrical impedance signal measurement on a PZT piezoelectric sensor by using an electrical impedance measurement system at an interval of 5 ℃ in the frequency band within a use temperature range of 10-50 ℃, and storing the measurement result by using a LabVIEW upper computer arranged on a personal computer, wherein the result is shown in figure 3.
S103, in a monitoring frequency band of 25-32kHz, because the electrical impedance signals at different temperatures have obvious resonance peaks in the monitoring frequency band, in the embodiment, for convenience of fitting, a measurement result of the highest temperature is selected as a fitting reference, namely, the electrical impedance signal measured at 50 ℃ is used as the fitting reference, the corresponding frequency of the resonance peak is 28.15kHz, and the corresponding frequencies of the resonance peaks of the electrical impedance signals measured at different temperatures are respectively measured, and the results are shown in FIG. 4.
S104, calculating the difference value between the corresponding frequency of the resonance peak of the electrical impedance signal at different temperatures and the corresponding frequency of the resonance peak of the electrical impedance signal at 50 ℃, namely the resonance frequency offset, performing linear fitting on the resonance frequency offset to measure the temperature as an independent variable x, and tuningThe vibration frequency offset is used as a dependent variable y, and the result of the fitting function is that y is 1.369-0.037x +5.195 x 10- 5x2+2.357*10-6x3The results are shown in FIG. 5.
S2, monitoring and compensating piezoelectric impedance: through the steps, temperature calibration of the PZT piezoelectric sensor at a monitoring frequency band of 25-32kHz is completed, and the fitted function formula is stored in a main control module of the electrical impedance measuring system. When the piezoelectric impedance method is used for monitoring the structure which needs to be monitored actually, the temperature near the PZT piezoelectric sensor is measured when the electrical impedance signal of the PZT piezoelectric sensor is measured, the corresponding resonance frequency offset value under the temperature is sent to an upper computer arranged on a personal computer, conversion is carried out according to a fitting function, the electrical impedance signal corresponding to the original temperature is obtained, and the influence of the temperature is eliminated automatically.
Specific example 2.2:
the difference between the specific embodiment and the specific embodiment 2.1 is that the monitoring frequency band is selected to be 32-38kHz, and the method specifically comprises the following steps:
s1, calibrating the PZT piezoelectric sensors at different temperatures:
s101, adopting the sample shown in the figure 2 as the monitored sample.
S102, selecting a 32-38kHz frequency band as a monitoring frequency band, putting a detected sample into a temperature control test box, carrying out electrical impedance signal measurement on a PZT piezoelectric sensor by using an electrical impedance measurement system at an interval of 5 ℃ in the frequency band within a use temperature range of 10-50 ℃, and storing the measurement result by using a LabVIEW upper computer arranged on a personal computer, wherein the result is shown in figure 6.
S103, in a detection frequency band of 32-38kHz, when the measurement temperature is higher than 25 ℃, a resonance peak begins to obviously disappear, which indicates that the detection frequency band can only be further used in a certain temperature range, namely 10-25 ℃, for the convenience of fitting, an electrical impedance signal measured at the highest temperature of 25 ℃ in the range is taken as a fitting reference, the corresponding frequency of the resonance peak is 34.8kHz, and the corresponding frequencies of the resonance peaks of the electrical impedance signal measured at different temperatures are respectively measured, and the result is shown in figure 7.
And S104, calculating the difference value between the corresponding frequency of the resonance peak of the electrical impedance signal at different temperatures and the corresponding frequency of the resonance peak of the electrical impedance signal at 25 ℃, namely the resonance frequency offset, performing linear fitting on the resonance frequency offset, taking the measured temperature as an independent variable x, taking the resonance frequency offset as a dependent variable y, and obtaining a fitting function result that y is 0.605-0.026x, wherein the result is shown in figure 8.
S2, monitoring and compensating piezoelectric impedance: through the steps, temperature calibration of the PZT piezoelectric sensor at the monitoring frequency band of 32-38kHz is completed, and the fitted function formula is stored in a main control module of the electrical impedance measuring system. When the piezoelectric impedance method is used for monitoring the structure which needs to be monitored actually, the temperature near the PZT piezoelectric sensor is measured when the electrical impedance signal of the PZT piezoelectric sensor is measured, the corresponding resonance frequency offset value under the temperature is sent to an upper computer arranged on a personal computer, conversion is carried out according to a fitting function, the electrical impedance signal corresponding to the original temperature is obtained, and the influence of the temperature is eliminated automatically.
It can be understood that, to the monitoring object of difference, to the more sensitive monitoring frequency range of its defect is different, right the utility model discloses the monitoring object of above-mentioned embodiment, impedance peak value is more outstanding in these two frequency channels, consequently selects to do the monitoring frequency channel, and other monitoring frequency channels also are applicable to the utility model discloses.
And for piezoelectric sensors, the working range is suitably 0-50 c, this embodiment provides a 10-50 c fit, and the method is equally applicable at lower temperatures.
To sum up, the utility model provides a piezoelectric impedance monitoring system and method with temperature compensation function, the harmonic peak offset is used for judging whether appear the main index of damage by the monitoring structure in the PZT sensor electrical impedance spectrum, and different test temperature can produce the influence to the electrical impedance spectrum of PZT sensor, especially can appear the skew of harmonic peak corresponding frequency, and then influence the judgement of structure health. The utility model discloses add the electrical impedance measurement system with the temperature measurement function, provide a frequency offset's compensation method, can offset the influence of temperature, further improve to the accuracy of judging by monitoring the structural damage state, provide hardware system and solution for the application of piezoelectric impedance method structure health monitoring technique in outdoor large-scale structure.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations can be made in the above embodiments by those skilled in the art without departing from the scope of the present invention, and that various changes in the detailed description and applications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. A piezoelectric impedance monitoring system with temperature compensation function, comprising:
the piezoelectric sensor and the temperature sensor are arranged on the monitored structure;
the electrical impedance measuring system is respectively connected with the piezoelectric sensor and the temperature sensor and is used for measuring electrical impedance signals of the piezoelectric sensor at different temperatures, acquiring resonance frequency offset serving as compensation parameters according to the electrical impedance signals and carrying out linear fitting on the resonance frequency offset;
and the computer is connected with the electrical impedance measuring system and is used for storing and displaying the fitting function result.
2. A piezoelectric impedance monitoring system according to claim 1, wherein the electrical impedance measurement system comprises: the piezoelectric sensor comprises a signal measuring module, a main control module, a power supply module and a serial port communication module, wherein the signal measuring module is respectively connected with the piezoelectric sensor and the temperature sensor, the main control module is connected with the signal measuring module and used for linear fitting, and the power supply module is connected with the serial port communication module.
3. A piezoelectric impedance monitoring system according to claim 2, wherein the computer is connected to the main control module via the serial communication module.
4. A piezoelectric impedance monitoring system according to claim 1, wherein the piezoelectric sensor and the temperature sensor are attached to the structure to be monitored by a high-power adhesive, and the temperature sensor is disposed adjacent to the piezoelectric sensor.
5. A piezoelectric impedance monitoring system according to any one of claims 1-4, wherein the piezoelectric sensor is a PZT sensor.
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| CN117330604A (en) * | 2023-12-01 | 2024-01-02 | 深圳市城市公共安全技术研究院有限公司 | Automatic temperature compensation method, device, computer equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117330604A (en) * | 2023-12-01 | 2024-01-02 | 深圳市城市公共安全技术研究院有限公司 | Automatic temperature compensation method, device, computer equipment and storage medium |
| CN117330604B (en) * | 2023-12-01 | 2024-05-07 | 深圳市城市公共安全技术研究院有限公司 | Automatic temperature compensation method, device, computer equipment and storage medium |
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