Novel high-frequency surface dynamic strain detection device

Abstract

The invention discloses a novel high-frequency surface dynamic strain detection device, and belongs to the technical field of surface strain detection. The surface dynamic strain detection device comprises a detection body, two installation bodies connected to the opposite sides of the detection body through beam bodies, and a data acquisition and processing system. The detection body is an elastic body with a cavity structure inside, strain gauges are arranged on the side surfaces, corresponding to the two mounting bodies, of the inner cavity of the detection body, and the strain gauges are used for detecting tension / compression strain borne by the side walls of the detection body where the strain gauges are located; a mounting hole is formed in the mounting body and is used for fixing the mounting body on the surface of an object to be measured; and the data acquisition and processing system is electrically connected with the strain gauges, and is used for acquiring and processing the tension / compression strain on the side wall of the detection body where the strain gauges are located, and outputting dynamic strain data of the surface of the to-be-detected object. The small-range fluctuation of the surface strain of the object to be measured can be captured, the accuracy and reliability of the measurement result are improved, meanwhile, the installation mode is simpler and more convenient, and the operation difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of surface strain detection, and in particular to a novel high-frequency surface dynamic strain detection device. Background Art

[0002] For modern infrastructure, such as bridges, tunnels, rail transit, water conservancy projects and various buildings, the safety and stability of the structure are very important. In order to understand the structural health of these infrastructures, it is necessary to monitor the dynamic strain of their surfaces through strain detection devices.

[0003] The traditional detection method is to set sensors on the surface of the object to be measured, and then connect external acquisition equipment to realize the measurement function. However, the traditional detection method has the following problems: the traditional detection method has high requirements on installation conditions and often requires complex pre-processing of the surface of the object to be measured, such as pasting piezoelectric materials or installing optical interferometers, which not only increases the difficulty of operation, but also prolongs the measurement time and reduces work efficiency; in an environment with much noise pollution, the signal and noise are mixed together, the traditional detection method has a small signal-to-noise ratio, poor signal transmission quality, and low sensitivity, and it is often unable to accurately capture the small range fluctuations of the surface strain of the object to be measured, which in turn affects the accuracy and reliability of the measurement results. Summary of the invention

[0004] The purpose of the present invention is to provide a new type of high-frequency surface dynamic strain detection device in view of the existing technical status, which can capture the small-range fluctuations of the surface strain of the object to be measured, improve the accuracy and reliability of the measurement results, and at the same time make the installation method simpler and reduce the difficulty of operation.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: A novel high-frequency surface dynamic strain detection device comprises a detection body, two mounting bodies connected to opposite sides of the detection body through a beam body, and a data acquisition and processing system; The detection body is an elastic body with a cavity structure inside, and strain gauges are provided on the inner cavity and the sides corresponding to the two mounting bodies, and the strain gauges are used to detect the tensile / compressive strains on the side walls of the detection body where the strain gauges are located; The mounting body is provided with a mounting hole, and the mounting hole is used to fix the mounting body on the surface of the object to be measured; The data acquisition and processing system is electrically connected to the strain gauge, and is used to collect and process the tensile / compressive strains on the side walls of the detection body where the strain gauge is located, and output the dynamic strain data of the surface of the object to be detected.

[0006] Furthermore, the data acquisition and processing system is arranged in the inner cavity of the detection body, and the data acquisition and processing system includes a data acquisition module, a data processing module and a power supply module. The data acquisition module is electrically connected to the strain gauge, and is used to collect the tensile / compressive strain of the side wall of the detection body where the strain gauge is located. The data processing module is electrically connected to the data acquisition module, and is used to process the tensile / compressive strain of the side wall of the detection body where the strain gauge is located, and output it as dynamic strain data of the surface of the object to be measured. The power supply module is electrically connected to the data acquisition module and the data processing module, and is used to power the data acquisition module and the data processing module.

[0007] Furthermore, the data acquisition and processing system also includes an indicator light module. The power supply module is electrically connected to the indicator light module for supplying power to the indicator light module. The data processing module outputs different control signals according to the size of the dynamic strain data on the surface of the object to be measured, so that the indicator light module displays different colors. The top surface of the detection body is open and a cover is provided in the opening, and the cover is made of transparent material.

[0008] Furthermore, it also includes a data bus, which runs from the outside of the detection body to its inner cavity and is electrically connected to the data processing module in the data acquisition and processing system, and is used to transmit the dynamic strain data of the surface of the object to be tested from the inner cavity of the detection body to the outside.

[0009] Furthermore, the data acquisition and processing system processes the tensile / compressive strain on the side wall of the detection body where the strain gauge is located, and outputs the dynamic strain data of the surface of the object to be measured. The processing method includes the following steps: Calculate the average value M1 of the tensile / compressive strain on the two pairs of side walls of the test body; After the average value M1 is multiplied by the preset calibration coefficient K, the output is the dynamic strain data of the surface of the object to be measured.

[0010] Furthermore, the strain gauges arranged on the inner cavity of the detection body and the side surfaces corresponding to each mounting body include a first strain gauge and a second strain gauge, the first strain gauge is arranged in the horizontal direction, and the second strain gauge is arranged in the vertical direction, and the tensile / compressive strain obtained by the second strain gauge is used as temperature compensation for the tensile / compressive strain obtained by the first strain gauge.

[0011] Furthermore, the number of the first strain gauges is not less than 1, and the tensile / compressive strain obtained by all the first strain gauges is an average value M2 of the tensile / compressive strains obtained by each first strain gauge. Furthermore, the bottom surfaces of the two mounting bodies are flush, and the bottom surface of the detection body is concave relative to the bottom surface of the mounting body.

[0012] Furthermore, the thickness of the side wall of the detection body where the strain gauge is located is smaller than the thickness of the side wall of the adjacent detection body.

[0013] Furthermore, the detection body, the beam body and the mounting body are integrally formed.

[0014] The beneficial effects of the present invention are: 1. The present invention provides a novel high-frequency surface dynamic strain detection device. A simply supported beam structure is constructed based on a detection body, a beam body and a mounting body. The concept of a simply supported beam is used, and bending moment measurement is used instead of tension and compression measurement. The measurement signal can be amplified through analysis and calculation processing. This design makes the surface dynamic strain detection device more sensitive and can capture small-range fluctuations of the surface strain of the object to be measured, thereby improving the accuracy and reliability of the measurement results. At the same time, this design makes the installation method of the surface dynamic strain detection device simpler and reduces the difficulty of operation. The friendly installation method also makes it easier for users to get started, shortens the learning curve, and improves work efficiency. 2. The present invention provides a novel high-frequency surface dynamic strain detection device, which integrates the data acquisition and processing system and the strain gauge in the inner cavity of the detection body. This design simplifies the structure of the device, makes the installation of the surface dynamic strain detection device more convenient, and greatly shortens the measurement time. In addition, since no external acquisition instrument and analyzer are required, it not only reduces the loss of signal transmission, but also reduces the amount of cables used, so that the detection cost can be controlled and the burden on users is reduced; 3. The present invention provides a new type of high-frequency surface dynamic strain detection device, which outputs different control signals according to the size of the dynamic strain data on the surface of the object to be measured, so that the indicator light module displays different colors. This design enables the surface dynamic strain detection device to intuitively display the measurement results, providing real-time basis for engineering inspection personnel to quickly analyze the structure safety; 4. The present invention provides a novel high-frequency surface dynamic strain detection device, which uses a data bus to transmit the dynamic strain data of the surface of the object to be measured. This design makes wiring more convenient when multi-point measurement is carried out through the surface dynamic strain detection device, improves the flexibility and scalability of the measurement network, and the bus structure makes data transmission more efficient, reduces the complexity of wiring, and improves the stability and reliability of the measurement network; 5. The present invention provides a novel high-frequency surface dynamic strain detection device. For the strain gauges arranged on the side surface corresponding to each mounting body, the detection value of the first strain gauge is averaged, and the detection value of the second strain gauge is used to perform temperature compensation processing on the detection value of the first strain gauge. This design makes the measurement error of the surface dynamic strain detection device smaller, and further improves the accuracy and reliability of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the disassembled structure of a novel high-frequency surface dynamic strain detection device of the present invention; Figure 2It is a structural schematic diagram of a data acquisition and processing system in a novel high-frequency surface dynamic strain detection device of the present invention; Figure 3 The present invention is a structural schematic diagram of the arrangement of the first strain gauge and the second strain gauge in a novel high-frequency surface dynamic strain detection device.

[0016] Label instructions: 1. Detection body, 101. Cavity structure, 2. Mounting body, 201. Mounting hole, 3. Beam body, 4. Strain gauge, 401. First strain gauge, 402. Second strain gauge, 5. Circuit board, 6. Cover plate, 7. Data bus. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Embodiment 1: See also Figures 1 to 3 As shown, a novel high-frequency surface dynamic strain detection device includes a detection body 1, two mounting bodies 2 connected to opposite sides of the detection body 1 through a beam body 3, and a data acquisition and processing system.

[0019] The detection body 1 is an elastic body with a cavity structure 101 inside, and strain gauges 4 are provided on the inner cavity and the sides corresponding to the two mounting bodies 2, which are generally attached. The strain gauges 4 are used to detect the tensile / compressive strains of the side walls of the detection body 1. For example, in this embodiment, the model of the strain gauge 4 is HB1-1000.

[0020] Specifically, the strain gauges 4 provided on the inner cavity of the detection body 1 and the side surface corresponding to each mounting body 2 include a first strain gauge 401 and a second strain gauge 402. The first strain gauge 401 is provided in the horizontal direction, and the second strain gauge 402 is provided in the vertical direction. The tensile / compressive strain obtained by the second strain gauge 402 is used as temperature compensation for the tensile / compressive strain obtained by the first strain gauge 401. Temperature compensation means subtracting the tensile / compressive strain obtained by the second strain gauge 402 from the tensile / compressive strain obtained by the first strain gauge 401, and recording it as the tensile / compressive strain of the side wall of the detection body 1 where the strain gauge 4 is located, thereby reducing the measurement error.

[0021] More specifically, the number of the first strain gauges 401 is not less than 1, and the tensile / compressive strain obtained by all the first strain gauges 401 is the average value M2 of the tensile / compressive strain obtained by each first strain gauge 402. Exemplarily, in this embodiment, the number of the first strain gauges 401 is 4. After the mean value processing, the measurement error can be further reduced.

[0022] The mounting body 2 is provided with a mounting hole 201 , and the mounting hole 201 is used to fix the mounting body 2 on the surface of the object to be measured, generally using bolts.

[0023] The data acquisition and processing system is electrically connected to the strain gauge 4 , and is used to collect and process the tensile / compressive strain of the side wall of the detection body 1 where the strain gauge 4 is located, and output the dynamic strain data of the surface of the object to be detected.

[0024] Specifically, the data acquisition and processing system processes the tensile / compressive strain on the side wall of the detection body 1 where the strain gauge 4 is located, and outputs the dynamic strain data of the surface of the object to be measured. The processing method includes the following steps: Calculate the average value M1 of the tensile / compressive strains on the two pairs of side walls of the test body 1; After the average value M1 is multiplied by the preset calibration coefficient K, the output is the dynamic strain data of the surface of the object to be measured.

[0025] The preset calibration coefficient K is obtained by means of a calibration test after the product of the surface dynamic strain detection device is formed.

[0026] In general, the present invention constructs a simply supported beam structure based on the detection body 1, the beam body 3 and the installation body 2, utilizes the concept of simply supported beams, adopts bending moment measurement instead of tension and compression measurement, and then amplifies the measurement signal through analysis and calculation processing. This design makes the surface dynamic strain detection device more sensitive and can capture small-range fluctuations of the surface strain of the object to be measured, thereby improving the accuracy and reliability of the measurement results. At the same time, this design makes the installation method of the surface dynamic strain detection device simpler (without complicated surface treatment, equipment installation, etc.), reduces the difficulty of operation, and the user-friendly installation method also makes it easier for users to get started, shortens the learning curve, and improves work efficiency.

[0027] In the above technical solution, the preferred design is as follows: The bottom surfaces of the two mounting bodies 2 are flush, and the bottom surface of the detection body 1 is concave relative to the bottom surface of the mounting body 2. According to the above design, when the surface dynamic strain detection device is installed on the surface of the object to be tested, it can avoid uneven places, making it more adaptable; The thickness of the side wall of the detection body 1 where the strain gauge 4 is located is less than the thickness of the side wall of the adjacent detection body 1, so that the side wall of the detection body 1 where the strain gauge 4 is located can be deformed relative to the side wall of the adjacent detection body 1. Exemplarily, in this embodiment, the detection body 1 is a rectangular parallelepiped structure, the thickness of the side wall of the detection body 1 where the strain gauge 4 is located is 0.6 mm, and the thickness of the side wall of the adjacent detection body 1 is 2 mm; The detection body 1, the beam body 3 and the installation body 2 are integrally formed, so that the simply supported beam structure constructed by the three is more stable. For example, in this embodiment, the detection body 1, the beam body 3 and the installation body 2 are integrally formed using stainless steel material.

[0028] Embodiment 2: See also Figure 1~2 As shown, based on Example 1, the data acquisition and processing system is arranged in the inner cavity of the detection body 1. This design simplifies the structure of the equipment, making the installation of the surface dynamic strain detection device more convenient, greatly shortening the measurement time, and since no external acquisition instrument and analyzer are required, not only the signal transmission loss is reduced, but also the amount of cables is reduced, the detection cost can be controlled, and the burden on users is reduced. Exemplarily, in this embodiment, the data acquisition and processing system uses a high-frequency acquisition circuit with an adjustable sampling rate of 100~1200Hz, which meets the needs of dynamic acquisition and can capture the details of high-frequency dynamic strain in real time and accurately. The high-speed acquisition circuit also improves the efficiency and accuracy of data acquisition, making the measurement results more reliable.

[0029] Specifically, the data acquisition and processing system includes a data acquisition module, a data processing module and a power supply module. The data acquisition module is electrically connected to the strain gauge, and is used to collect the tensile / compressive strain on the side wall of the detection body 1 where the strain gauge 4 is located. The data processing module is electrically connected to the data acquisition module, and is used to process the tensile / compressive strain on the side wall of the detection body 1 where the strain gauge 4 is located, and output it as dynamic strain data on the surface of the object to be measured. The power supply module is electrically connected to the data acquisition module and the data processing module, and is used to power the data acquisition module and the data processing module.

[0030] More specifically, the data acquisition and processing system also includes an indicator light module, a power supply module is electrically connected to the indicator light module, and is used to power the indicator light module. The data processing module outputs different control signals according to the size of the dynamic strain data on the surface of the object to be measured, so that the indicator light module displays different colors (for example, different colors such as red, blue, yellow, and green are set in advance to display the meaning represented by the strain result). The top surface of the detection body 1 is open and a cover plate 6 is set in the opening. The cover plate 6 is made of transparent material. This design allows the surface dynamic strain detection device to intuitively display the measurement results, providing real-time basis for engineering inspection personnel to analyze the structure safely and quickly.

[0031] It should be noted that the data acquisition module, data processing module, indicator light module and power module are all integrated on the circuit board 5. The power module has a distribution board and is electrically connected to the data acquisition module, data processing module and indicator light module through the distribution board.

[0032] Embodiment 3: See also Figure 1As shown, on the basis of Example 1, the surface dynamic strain detection device also includes a data bus 7, which runs from the outside of the detection body 1 to its inner cavity and is electrically connected to the data processing module in the data acquisition and processing system, and is used to transmit the dynamic strain data of the surface of the object to be measured from the inner cavity of the detection body 1 to the outside.

[0033] A data bus is used to transmit the dynamic strain data of the surface of the object to be measured. This design makes wiring more convenient when conducting multi-point measurement through the surface dynamic strain detection device, improves the flexibility and scalability of the measurement network, and the bus structure makes data transmission more efficient, reduces the complexity of wiring, and improves the stability and reliability of the measurement network.

[0034] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art can implement the present invention in various other specific implementation modes based on the contents disclosed in the present invention. Therefore, any design that adopts the design structure and concept of the present invention and makes some simple changes or modifications shall fall within the scope of protection of the present invention.

Claims

1. A novel high-frequency surface dynamic strain detection device, characterized in that: It includes a detection body, two installation bodies connected to the opposite sides of the detection body through a beam body, and a data acquisition and processing system; The detection body is an elastic body with a cavity structure inside, and strain gauges are provided on the inner cavity and the sides corresponding to the two mounting bodies, and the strain gauges are used to detect the tensile / compressive strains on the side walls of the detection body where the strain gauges are located; The mounting body is provided with a mounting hole, and the mounting hole is used to fix the mounting body on the surface of the object to be measured; The data acquisition and processing system is electrically connected to the strain gauge, and is used to collect and process the tensile / compressive strains on the side walls of the detection body where the strain gauge is located, and output the dynamic strain data of the surface of the object to be detected.

2. According to claim 1, a novel high-frequency surface dynamic strain detection device is characterized in that: The data acquisition and processing system is arranged in the inner cavity of the detection body, and the data acquisition and processing system includes a data acquisition module, a data processing module and a power supply module. The data acquisition module is electrically connected to the strain gauge, and is used to collect the tensile / compressive strain of the side wall of the detection body where the strain gauge is located. The data processing module is electrically connected to the data acquisition module, and is used to process the tensile / compressive strain of the side wall of the detection body where the strain gauge is located, and output it as dynamic strain data of the surface of the object to be measured. The power supply module is electrically connected to the data acquisition module and the data processing module, and is used to supply power to the data acquisition module and the data processing module.

3. A novel high-frequency surface dynamic strain detection device according to claim 2, characterized in that: The data acquisition and processing system also includes an indicator light module. The power module is electrically connected to the indicator light module and is used to power the indicator light module. The data processing module outputs different control signals according to the size of the dynamic strain data on the surface of the object to be measured, so that the indicator light module displays different colors. The top surface of the detection body is open and a cover is provided in the opening. The cover is made of transparent material.

4. A novel high-frequency surface dynamic strain detection device according to claim 2, characterized in that: It also includes a data bus, which runs from the outside of the detection body to its inner cavity and is electrically connected to the data processing module in the data acquisition and processing system, and is used to transmit the dynamic strain data of the surface of the object to be detected from the inner cavity of the detection body to the outside.

5. According to claim 1, a novel high-frequency surface dynamic strain detection device is characterized in that: The data acquisition and processing system processes the tensile / compressive strain on the side wall of the detection body where the strain gauge is located, and outputs the dynamic strain data of the surface of the object to be measured. The processing method includes the following steps: Calculate the average value M1 of the tensile / compressive strain on the two pairs of side walls of the test body; After the average value M1 is multiplied by the preset calibration coefficient K, the output is the dynamic strain data of the surface of the object to be measured.

6. A novel high-frequency surface dynamic strain detection device according to claim 5, characterized in that: The strain gauges arranged on the inner cavity of the detection body and the side surfaces corresponding to each mounting body include a first strain gauge and a second strain gauge. The first strain gauge is arranged in the horizontal direction, and the second strain gauge is arranged in the vertical direction. The tensile / compressive strain obtained by the second strain gauge is used as temperature compensation for the tensile / compressive strain obtained by the first strain gauge.

7. A novel high-frequency surface dynamic strain detection device according to claim 6, characterized in that: The number of the first strain gauges is not less than 1, and the tensile / compressive strain obtained by all the first strain gauges is an average value M2 of the tensile / compressive strains obtained by each first strain gauge.

8. A novel high-frequency surface dynamic strain detection device according to any one of claims 1 to 7, characterized in that: The bottom surfaces of the two mounting bodies are flush, and the bottom surface of the detection body is concave relative to the bottom surface of the mounting body.

9. A novel high-frequency surface dynamic strain detection device according to any one of claims 1 to 7, characterized in that: The thickness of the side wall of the detection body where the strain gauge is located is smaller than the thickness of the side wall of the adjacent detection body.

10. A novel high-frequency surface dynamic strain detection device according to any one of claims 1 to 7, characterized in that: The detection body, the beam body and the installation body are integrally formed.

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