An intelligent self-sensing dual-block sleeper calibration system and calibration method

Abstract

The present invention discloses an intelligent self-sensing dual-block sleeper calibration system and a calibration method thereof, comprising a dual-block sleeper, a fiber grating intelligent sensor, a calibration reaction frame, an iron pad, a jack, a piezoelectric pressure sensor and an intelligent collector, wherein the fiber grating intelligent sensor is pre-buried in the dual-block sleeper and is used to test temperature changes and strain changes inside the sleeper, and its wire is led out from the side of the dual-block sleeper along the truss steel bar; the calibration reaction frame is installed on the dual-block sleeper and is used as a reaction point for the jack to apply pressure; the iron pad is installed on the rail support platform surface of the dual-block sleeper; the jack is installed on the iron pad and is used to apply a load to the iron pad with the calibration reaction frame as a reaction point; the piezoelectric pressure sensor is installed on the jack and is used to measure the pressure value applied by the jack; the intelligent collector is installed on the calibration reaction frame and is used to collect the wavelength of the fiber grating intelligent sensor and the electrical signal value of the piezoelectric pressure sensor and calculate the functional relationship between the values measured by the two sensors.

Description

Technical Field

[0001] The present invention relates to the field of track structure monitoring, and in particular to an intelligent self-sensing dual-block sleeper calibration system and a calibration method thereof. Background Art

[0002] Twin-block sleepers are made of reinforced concrete, featuring a stable structure and long service life. Twin-block ballastless track structures are widely used on high-speed railways worldwide. However, there is currently no monitoring method for twin-block sleepers. After pre-embedding fiber grating intelligent sensors into twin-block sleepers, the precise placement of sensors cannot be guaranteed every time, so the sensors need to be calibrated to find the functional relationship between the strain inside the sleeper and the pressure on the sleeper. Summary of the Invention

[0003] In order to overcome the deficiencies in the prior art, the present invention provides an intelligent self-sensing dual-block sleeper calibration system and a calibration method thereof, which have stable structure, accurate measurement, high calculation efficiency, convenient installation and strong practicality.

[0004] In order to achieve the above-mentioned purpose of the invention, the technical solutions adopted to solve the technical problems are as follows:

[0005] The present invention discloses an intelligent self-sensing dual-block sleeper calibration system, comprising a dual-block sleeper, a fiber grating intelligent sensor, a calibration reaction frame, an iron pad, a jack, a piezoelectric pressure sensor and an intelligent collector, wherein:

[0006] The fiber grating intelligent sensor is pre-embedded in the dual-block sleeper and is used to test the temperature change and strain change inside the dual-block sleeper. The wire is led out from the side of the dual-block sleeper along the truss steel bar.

[0007] The calibration reaction frame is installed on the double-block sleeper and is used as a reaction point for the pressure applied by the jack;

[0008] The iron plate is installed on the rail support surface of the double-block sleeper;

[0009] The jack is mounted on the iron plate and is used to apply a load to the iron plate using the calibration reaction frame as a reaction point;

[0010] The piezoelectric pressure sensor is installed on the jack and is used to measure the pressure value applied by the jack;

[0011] The intelligent collector is installed on the calibration reaction frame and is used to collect the wavelength of the fiber grating intelligent sensor and the electrical signal value of the piezoelectric pressure sensor and calculate the linear relationship between the values measured by the two sensors.

[0012] Furthermore, the double-block sleeper includes two sleeper blocks and a bottom truss rib structure, and the two sleeper blocks are symmetrically arranged on the bottom truss rib structure.

[0013] Furthermore, the calibration reaction frame includes a reaction frame top steel plate, four reaction frame side tension columns, two reaction frame bottom steel bars and four reaction frame fixing bolts, wherein:

[0014] The two bottom steel bars of the reaction frame respectively pass through the bottom truss reinforcement structure and are each provided with two bolt holes;

[0015] The lower ends of the four side pull columns of the reaction frame are fixedly connected to the two bottom steel bars of the reaction frame through the four reaction frame fixing bolts;

[0016] The top steel plate of the reaction frame is welded to the four side tension columns of the reaction frame to form reaction points.

[0017] Furthermore, the bottom steel bar of the reaction frame adopts a T-shaped structure, and an I-shaped anti-bending structure is added to the top steel plate of the reaction frame, so that the calibration reaction frame has sufficient rigidity to withstand the reaction force when the load is applied.

[0018] Preferably, the bottom of the iron pad has a certain inclination angle, which is the same as the inclination angle of the rail bottom slope of the rail support platform, so that the vertical pressure applied by the jack can be applied vertically to the surface of the rail support platform.

[0019] Preferably, a groove matching the size of the jack is provided on the surface of the iron pad for installing the jack to ensure that the jack is placed in the same position each time and the position where the load is applied is the same.

[0020] Furthermore, the jack is installed in the groove on the surface of the iron pad, and the lower surface of the top steel plate of the reaction frame on the calibration reaction frame is used as the reaction point, which is used to apply surface pressure to the rail support platform surface of the double-block sleeper by applying load to the iron pad.

[0021] Furthermore, the intelligent collector is installed on the top steel plate of the reaction frame of the calibration reaction frame, and the wires of the fiber grating intelligent sensor and the piezoelectric pressure sensor are inserted to collect the numerical values of the two sensors at the same sampling frequency, and automatically convert the collected light wavelength changes of the fiber grating intelligent sensor into strain values, and convert the electrical signals collected by the piezoelectric pressure sensor into pressure values. The converted pillow internal strain-pillow pressure is plotted into a curve graph and linear fitting is performed to find its linear optical fiber and display it on the display screen of the intelligent collector.

[0022] The present invention also discloses an intelligent self-sensing dual-block sleeper calibration method, which utilizes the intelligent self-sensing dual-block sleeper calibration system to perform calibration, and includes the following steps:

[0023] Step 1: The fiber grating intelligent sensor is embedded in the double-block sleeper, the iron plate is installed on the surface of the rail support platform, the jack is installed on the iron plate, the piezoelectric pressure sensor is installed on the jack, and then the calibration reaction frame is installed. Finally, the intelligent collector is installed on the calibration reaction frame;

[0024] Step 2: Connect the wires of the fiber grating smart sensor and the piezoelectric pressure sensor to the smart collector, turn on the smart collector and click to start data collection. Open the oil inlet valve of the jack so that the jack applies a load to the surface of the rail support platform with the top steel plate of the reaction frame as the reaction point. First, preload to ensure that the entire system is in working condition. Preload a pressure value of 10kN, slowly load until it stabilizes, and then unload.

[0025] Step 3: After the pre-loading is completed, the formal loading begins. During the formal loading, the jack slowly applies pressure to the rail support from 0-20kN, and the piezoelectric pressure value and the fiber Bragg grating strain value on the intelligent collector display are observed in real time to see if they are consistent. The speed at which the jack applies the load is controlled according to the speed of their value changes.

[0026] Step 4: After loading and unloading, click "End Collection" on the smart collector and click "View Results". The smart collector screen will automatically generate the last loaded supraoccipital pressure and internal occipital strain time history curve, as well as the internal occipital strain-supraoccipital pressure curve, the linear fitting result, and the functional relationship between internal occipital strain and supraoccipital pressure.

[0027] Step 5: After the first loading is completed, repeat the experiment several times. After the repeated experiments are completed, click Calculate Average Result. The smart collector will calculate the average value of the pillow strain-pillow pressure function relationship of several loading tests.

[0028] Furthermore, the installation steps for calibrating the reaction frame in step 1 are as follows:

[0029] First, insert the bottom steel bar of the reaction frame from the bottom truss reinforcement structure of the double-block sleeper so that the upper surface of the bottom steel bar of the reaction frame fits tightly with the lower surface of the sleeper; insert the four reaction frame side tension columns welded on the top steel plate of the reaction frame into the bolt holes of the bottom steel bar of the reaction frame, and fix them with the reaction frame fixing bolts.

[0030] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0031] The present invention provides an intelligent self-sensing dual-block sleeper calibration system, which achieves the purpose of measuring the internal strain of the sleeper by pre-embedding a fiber optic Bragg grating intelligent sensor in the dual-block sleeper; and designs a set of reaction frame fixtures to provide a reaction point for the surface pressure applied by the rail support platform, and optimizes the reaction frame structure to make the structure more rigid and more stable; the iron pad on the rail support platform is designed with an inclination angle the same as the rail bottom slope to ensure that the applied surface pressure is perpendicular to the surface of the rail support platform; a piezoelectric pressure sensor is set on the jack to measure the load applied by the jack; finally, the values of the two sensors are collected by an intelligent collector and a linear fitting calculation is performed to find the linear relationship between the strain inside the sleeper and the pressure on the sleeper. After installing the calibration fixture, only pressure is applied to the jack, and the size of the strain inside the sleeper, the size of the force applied by the jack, and the functional relationship between the strain inside the sleeper and the pressure on the sleeper and its curve diagram can be read directly on the display of the intelligent collector, with high calculation efficiency, convenience and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0033] Figure 1 This is a schematic diagram of the overall structure of an intelligent self-sensing dual-block sleeper calibration system of the present invention;

[0034] Figure 2 This is a structural diagram of an intelligent self-sensing dual-block sleeper calibration system of the present invention after the iron pad and the jack are installed;

[0035] Figure 3 This is a structural diagram of a calibration reaction frame in an intelligent self-sensing dual-block sleeper calibration system of the present invention;

[0036] Figure 4 It is a schematic diagram of inserting the bottom steel bars of the reaction frame into the bottom truss steel bars of the double-block sleeper in the intelligent self-sensing double-block sleeper calibration system of the present invention;

[0037] Figure 5 This is a structural diagram of an intelligent self-sensing dual-block sleeper calibration system of the present invention after the calibration reaction frame is installed and the intelligent collector is installed.

[0038]

Explanation of main symbols

[0039] 1-Double-block sleeper;

[0040] 2-Fiber Bragg grating intelligent sensor;

[0041] 3-Reaction frame top steel plate;

[0042] 4- side pull column of reaction frame;

[0043] 5-Steel bar at the bottom of the reaction frame;

[0044] 6-Reaction frame fixing bolt;

[0045] 7- iron plate;

[0046] 8- Jack;

[0047] 9- piezoelectric pressure sensor;

[0048] 10-Intelligent collector. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] Example 1

[0053] like Figure 1-5 As shown, this embodiment discloses an intelligent self-sensing dual-block sleeper calibration tool, including a dual-block sleeper 1, a fiber Bragg grating intelligent sensor 2, a calibration reaction frame, an iron pad 7, a jack 8, a piezoelectric pressure sensor 9 and an intelligent collector 10, wherein:

[0054] The fiber Bragg grating intelligent sensor 2 is pre-embedded in the bi-block sleeper 1 and is used to measure temperature and strain changes within the bi-block sleeper 1 using the characteristic changes in light wavelength. Its conductors extend along the side of the bi-block sleeper 1. In this embodiment, the fiber Bragg grating intelligent sensor 2 is selected as the sensor for measuring strain within the sleeper. Its advantages include stable material performance, unaffected by the complex chemical reaction environment during concrete hydration, strong resistance to electromagnetic interference and corrosion, low loss, strong environmental adaptability, a slender fiber shape with a small diameter, easy deployment, and minimal impact on the overall strength of the sleeper. It also possesses excellent durability, measures dynamic signals, and is suitable for monitoring the dynamic response caused by a moving train. Its strain and temperature test accuracy and range meet monitoring requirements.

[0055] The calibration reaction frame is installed on the double-block sleeper 1 and is used as a reaction point for the jack 8 to apply pressure;

[0056] The iron plate 7 is installed on the rail support surface of the double-block sleeper 1;

[0057] The jack 8 is mounted on the iron plate 7 and is used to apply a load to the iron plate 7 using the calibration reaction frame as a reaction point;

[0058] The piezoelectric pressure sensor 9 is mounted on the jack 8 and is used to measure the pressure applied by the jack 8. The pressure value measured by the piezoelectric pressure sensor 9 divided by the area of the iron pad 7 is the surface pressure on the rail support surface of the bi-block sleeper 1. In this embodiment, a piezoelectric pressure sensor 9 is used on the jack 8 to measure the load value applied by the jack 8. The selected piezoelectric pressure sensor 9 is cylindrical, large in size, and has high rigidity, and can directly serve as the loading point of the jack 8.

[0059] The intelligent collector 10 is mounted on the calibration reaction frame and is used to collect the wavelength of the fiber grating intelligent sensor 2 and the electrical signal value of the piezoelectric pressure sensor 9 and calculate the linear relationship between the values measured by the two sensors.

[0060] Furthermore, the dual-block sleeper 1 includes two sleeper blocks (not marked) and a bottom truss rib structure (not marked), and the two sleeper blocks are symmetrically arranged on the bottom truss rib structure.

[0061] refer to Figure 3 The calibration reaction frame includes a reaction frame top steel plate 3, four reaction frame side pull columns 4, two reaction frame bottom steel bars 5 and four reaction frame fixing bolts 6, wherein:

[0062] The two bottom steel bars 5 of the reaction frame respectively pass through the bottom truss reinforcement structure and are each provided with two bolt holes (not shown);

[0063] The lower ends of the four reaction frame side pull columns 4 are fixedly connected to the two reaction frame bottom steel bars 5 through the four reaction frame fixing bolts 6; during actual operation, check whether the reaction frame top steel plate 3 is parallel to the upper surface of the iron pad 7.

[0064] The top steel plate 3 of the reaction frame is welded to the four side tension columns 4 of the reaction frame to form reaction points.

[0065] Furthermore, the bottom steel bar 5 of the reaction frame adopts a T-shaped structure to increase its bending stiffness; an I-shaped anti-bending structure is added to the top steel plate 3 of the reaction frame to ensure that the calibrated reaction frame has sufficient stiffness to withstand the reaction force when a load is applied, thereby increasing the overall stiffness of the structure when under pressure, enhancing stability, and greatly reducing bending deformation.

[0066] Figure 2 In the figure, the iron pad 7 has a certain inclination angle at the bottom, which is the same as the inclination angle of the rail bottom slope of the rail support platform, so that the vertical pressure applied by the jack 8 can be applied vertically on the surface of the rail support platform, which is more in line with its actual stress conditions.

[0067] Preferably, the surface of the iron plate 7 is provided with a groove matching the size of the jack 8 for mounting the jack 8, thereby ensuring that the jack 8 is placed in the same position each time and the load is applied at the same location. Accordingly, the jack 8 is mounted in the groove on the surface of the iron plate 7, and uses the lower surface of the top steel plate 3 of the reaction frame on the calibration reaction frame as the reaction point, thereby applying a load to the iron plate 7 and thereby applying surface pressure to the rail support surface of the bi-block sleeper 1.

[0068] Furthermore, an intelligent collector 10 having both a fiber grating wire interface and a piezoelectric pressure sensor 9 wire interface is selected. The intelligent collector 10 is installed on the top steel plate 3 of the reaction frame of the calibration reaction frame, and the wires of the fiber grating intelligent sensor 2 and the piezoelectric pressure sensor 9 are inserted. It is used to collect the numerical values of the two sensors at the same sampling frequency, and automatically convert the collected light wavelength changes of the fiber grating intelligent sensor 2 into strain values, and convert the electrical signals collected by the piezoelectric pressure sensor 9 into pressure values. Finally, the converted pillow internal strain value-pillow pressure value is plotted into a curve graph and linear fitting is performed to find its functional relationship and display it on the display screen of the intelligent collector 10.

[0069] Example 2

[0070] The present invention also discloses an intelligent self-sensing dual-block sleeper calibration method, which utilizes the intelligent self-sensing dual-block sleeper calibration system to perform calibration, and includes the following steps:

[0071] Step 1: The fiber grating intelligent sensor 2 is pre-embedded in the double-block rail sleeper 1, the iron plate 7 is installed on the surface of the rail support platform, the jack 8 is installed on the iron plate 7, and the piezoelectric pressure sensor 9 is installed on the jack 8 (the jack 8 is slightly lifted so that the upper surface of the piezoelectric pressure sensor 9 fits with the lower surface of the reaction frame reaction steel plate), then the calibration reaction frame is installed, and finally the intelligent collector 10 is installed on the calibration reaction frame.

[0072] Step 2: Connect the wires of the fiber grating intelligent sensor 2 and the wires of the piezoelectric pressure sensor 9 to the intelligent collector 10, turn on the switch of the intelligent collector 10 and click to start collecting data, open the oil inlet valve of the jack 8 so that the jack 8 applies a load to the surface of the rail support platform with the top steel plate 3 of the reaction frame as the reaction point, first preload to ensure that the whole system is in working state, preload 10kN pressure value, slowly load and unload after it stabilizes.

[0073] Step 3: After the preloading is completed, formal loading begins. During formal loading, the jack 8 slowly applies pressure to the rail support platform from 0-20kN, and observes in real time whether the changes in the piezoelectric pressure value and the fiber Bragg grating strain value on the display screen of the intelligent collector 10 are consistent, and controls the speed at which the jack 8 applies the load according to the speed of change of their values.

[0074] Step 4: After loading and unloading, click "End Collection" on the smart collector 10 and click "View Results". The smart collector 10 will automatically generate the last loaded supraoccipital pressure and intraoccipital strain time history curve, as well as the intraoccipital strain-supraoccipital pressure curve, the linear fitting result, and the functional relationship between intraoccipital strain and supraoccipital pressure on the display screen.

[0075] Step 5: After the first loading is completed, repeat the experiment several times. After the repeated experiments are completed, click Calculate Average Result. The smart collector 10 will calculate the average value of the pillow internal strain-pillow pressure function relationship of several loading tests.

[0076] The installation steps for calibrating the reaction frame in step 1 are as follows:

[0077] First, insert the bottom steel bar 5 of the reaction frame from the bottom truss reinforcement structure of the double-block sleeper 1 so that the upper surface of the bottom steel bar 5 of the reaction frame is tightly fitted with the lower surface of the sleeper; insert the four reaction frame side tension columns 4 welded on the top steel plate 3 of the reaction frame into the bolt holes of the bottom steel bar 5 of the reaction frame, and fix them with the reaction frame fixing bolts 6.

[0078] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An intelligent self-sensing dual-block sleeper calibration system, characterized in that: It includes a double-block sleeper, a fiber grating intelligent sensor, a calibration reaction frame, an iron pad, a jack, a piezoelectric pressure sensor and an intelligent collector, including: The fiber grating intelligent sensor is pre-embedded in the dual-block sleeper and is used to test the temperature change and strain change inside the dual-block sleeper. The wire is led out from the side of the dual-block sleeper along the truss steel bar. The calibration reaction frame is installed on the double-block sleeper and is used as a reaction point for the pressure applied by the jack; The iron plate is installed on the rail support surface of the double-block sleeper; The jack is mounted on the iron plate and is used to apply a load to the iron plate using the calibration reaction frame as a reaction point; The piezoelectric pressure sensor is installed on the jack and is used to measure the pressure value applied by the jack; The intelligent collector is mounted on the calibration reaction frame and is used to collect the wavelength of the fiber Bragg grating intelligent sensor and the electrical signal value of the piezoelectric pressure sensor and calculate the functional relationship between the values measured by the two sensors; The double-block sleeper includes two sleeper blocks and a bottom truss rib structure, and the two sleeper blocks are symmetrically arranged on the bottom truss rib structure; The calibration reaction frame includes a reaction frame top steel plate, four reaction frame side tension columns, two reaction frame bottom steel bars and four reaction frame fixing bolts, wherein: The two bottom steel bars of the reaction frame respectively pass through the bottom truss reinforcement structure and are each provided with two bolt holes; The lower ends of the four side pull columns of the reaction frame are fixedly connected to the two bottom steel bars of the reaction frame through the four reaction frame fixing bolts; The top steel plate of the reaction frame is welded to the four side tension columns of the reaction frame to form a reaction point; The bottom of the iron pad has a certain inclination angle, which is the same as the inclination angle of the rail bottom slope of the rail support platform, so that the vertical pressure applied by the jack can be applied vertically to the surface of the rail support platform.

2. The intelligent self-sensing dual-block sleeper calibration system according to claim 1 is characterized in that: The bottom steel bar of the reaction frame adopts a T-shaped structure, and an I-shaped anti-bending structure is added to the top steel plate of the reaction frame to ensure that the calibration reaction frame has sufficient rigidity to withstand the reaction force when a load is applied.

3. The intelligent self-sensing dual-block sleeper calibration system according to claim 1 is characterized in that: The surface of the iron pad is provided with a groove that matches the size of the jack, which is used to install the jack to ensure that the position of the jack is consistent each time and the position where the load is applied is the same.

4. The intelligent self-sensing dual-block sleeper calibration system according to claim 3 is characterized in that: The jack is installed in the groove on the surface of the iron pad, and the lower surface of the top steel plate of the reaction frame on the calibration reaction frame is used as the reaction point, which is used to apply surface pressure to the rail support surface of the double-block sleeper by applying load to the iron pad.

5. The intelligent self-sensing dual-block sleeper calibration system according to claim 1 is characterized in that: The intelligent collector is installed on the top steel plate of the reaction frame of the calibration reaction frame, and the wires of the fiber grating intelligent sensor and the piezoelectric pressure sensor are inserted into the intelligent collector. The intelligent collector is used to collect the values of the two sensors at the same sampling frequency, automatically convert the light wavelength changes collected by the fiber grating intelligent sensor into strain values, and convert the electrical signals collected by the piezoelectric pressure sensor into pressure values. The converted pillow internal strain-pillow pressure is plotted into a curve graph, and linear fitting is performed to find its linear optical fiber and display it on the display screen of the intelligent collector.

6. An intelligent self-sensing dual-block sleeper calibration method, characterized in that: Calibration using the intelligent self-sensing dual-block sleeper calibration system according to any one of claims 1 to 5 comprises the following steps: Step 1: The fiber grating intelligent sensor is embedded in the double-block sleeper, the iron plate is installed on the surface of the rail support platform, the jack is installed on the iron plate, the piezoelectric pressure sensor is installed on the jack, and then the calibration reaction frame is installed. Finally, the intelligent collector is installed on the calibration reaction frame; Step 2: Connect the wires of the fiber grating smart sensor and the piezoelectric pressure sensor to the smart collector, turn on the smart collector and click to start data collection. Open the oil inlet valve of the jack so that the jack applies a load to the surface of the rail support platform with the top steel plate of the reaction frame as the reaction point. First, preload to ensure that the entire system is in working condition. Preload a pressure value of 10kN, slowly load until it stabilizes, and then unload. Step 3: After the pre-loading is completed, the formal loading begins. During the formal loading, the jack slowly applies pressure to the rail support from 0-20kN, and the piezoelectric pressure value and the fiber Bragg grating strain value on the intelligent collector display are observed in real time to see if they are consistent. The speed at which the jack applies the load is controlled according to the speed of their value changes. Step 4: After loading and unloading, click "End Collection" on the smart collector and click "View Results". The smart collector screen will automatically generate the last loaded supraoccipital pressure and internal occipital strain time history curve, as well as the internal occipital strain-supraoccipital pressure curve, the linear fitting result, and the functional relationship between internal occipital strain and supraoccipital pressure. Step 5: After the first loading is completed, repeat the experiment several times. After the repeated experiments are completed, click Calculate Average Result. The smart collector will calculate the average value of the pillow strain-pillow pressure function relationship of several loading tests.

7. The intelligent self-sensing dual-block sleeper calibration method according to claim 6, characterized in that: The installation steps of the calibrated reaction frame in step 1 are as follows: first, insert the bottom steel bar of the reaction frame from the bottom truss reinforcement structure of the double-block sleeper so that the upper surface of the bottom steel bar of the reaction frame fits tightly with the lower surface of the sleeper; insert the four reaction frame side tension columns welded on the top steel plate of the reaction frame into the bolt holes of the bottom steel bar of the reaction frame, and fix them with the reaction frame fixing bolts.

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