Rigid-flexible coupling rotating body deformation sensor based on full-flexible design and test method

Abstract

The invention relates to the technical field of sensors, in particular to a rigid-flexible coupling rotating body deformation sensor based on full-flexible design and a testing method. The sensor comprises an annular main body; the annular main body is a closed ring formed by alternately connecting a plurality of rigid arcs and a plurality of flexible arcs; the rigid arc and the flexible arc are arranged in a manner of meeting dynamic balance; the plurality of micro data acquisition devices are respectively integrated on each rigid arc; the miniature data acquisition device comprises a Wheatstone bridge, a filtering module, a digital potentiometer, an analog-to-digital conversion module, a digital acquisition module, a single-chip microcomputer, a wireless signal sending module and a battery unit. The plurality of strain gauge groups are respectively arranged on the outer surface of each flexible arc; and the thickness of the flexible arc is uniform. According to the invention, deformation adaptation and high-sensitivity measurement are realized through a rigid-flexible arc alternating structure, and convenient monitoring under a rotation working condition is realized through a wireless communication miniature data acquisition device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a rigid-flexible coupling rotating body deformation sensor based on a full-flexible design and a testing method. BACKGROUND

[0002] In the field of rotating machinery, deformation monitoring of rotating body structure is of great significance for equipment operation state evaluation and fault warning. At present, the traditional deformation measurement sensor still has certain limitations in actual application, which is specifically manifested as follows: Firstly, the sensor with rigid structure, such as eddy current sensor, is usually installed by means of fixed support for deformation monitoring of rotating body structure. This kind of installation method may introduce additional stiffness to the rotating body, thereby interfering with its inherent dynamic characteristics and affecting the accuracy of deformation measurement. Secondly, the measurement scheme based on strain gauge and combined with wired transmission mode is relatively complex in wiring on the surface of rotating body, and there are problems such as cable winding and breakage caused by rotating motion, which easily causes the failure of measurement system and lacks reliability.

[0003] In view of this, the present application is proposed. SUMMARY

[0004] The purpose of the present application is to provide a rigid-flexible coupling rotating body deformation sensor based on a full-flexible design and a testing method, which realizes deformation adaptation and high-sensitivity measurement through rigid-flexible arc alternating structure, and realizes convenient monitoring under rotating working condition through a miniature data acquisition device of wireless communication.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: In a first aspect, the present application provides a rigid-flexible coupling rotating body deformation sensor based on a full-flexible design, comprising: a ring-shaped main body; the ring-shaped main body is a closed ring composed of a plurality of rigid arcs and a plurality of flexible arcs connected alternately; the rigid arcs and the flexible arcs are arranged in a manner meeting dynamic balance; a plurality of miniature data acquisition devices integrated on each rigid arc respectively; the miniature data acquisition device comprises a Wheatstone bridge, a filtering module, a digital potentiometer, an analog-digital conversion module, a digital acquisition module, a single-chip microcomputer, a wireless signal sending module and a battery unit; a plurality of strain gauge groups arranged on the outer surface of each flexible arc respectively; the thickness of the flexible arc is uniform.

[0006] In a second aspect, the present application provides a radial deformation measurement method of a rotating body, which adopts the rigid-flexible coupling rotating body deformation sensor based on a full-flexible design provided by the present application. The method comprises: sleeving the rigid-flexible coupling rotating body deformation sensor based on a full-flexible design into one end of the measured rotating body; Turning on the micro data acquisition device and the receiving device; During the self-rotation of the measured rotating body around the shaft, an axial load is applied; The micro data acquisition device collects the voltage variation generated by the strain gauge group and converts the voltage variation into a radial deformation variable of the measured rotating body; The radial deformation variable is sent to the receiving device through the wireless signal sending module.

[0007] Compared with the prior art, the beneficial effects of the present application are: The present application discloses a rigid-flexible coupling rotating body deformation sensor based on full-flexible design and a testing method, the sensor is composed of a plurality of rigid arcs and a plurality of flexible arcs to form a ring-shaped main body, a micro data acquisition device is integrated on the rigid arc, and a strain gauge group is arranged on the flexible arc. When measuring the radial deformation of the rotating body, the strain gauge group collects the deformation data of the flexible arc, which is wirelessly transmitted to the receiving device through the micro data acquisition device on the rigid arc, so as to realize real-time monitoring of the deformation of the rotating body. The present application has the advantages of strong rigid-flexible coupling adaptability, high measurement sensitivity, convenient wireless transmission, and adaptability to complex rotating conditions, and solves the problems of large rigid interference, weak deformation signal, wiring difficulty and insufficient sensitivity of the traditional sensor in the dynamic deformation measurement of the rotating body. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0009] Figure 1 is a structure schematic diagram of a rigid-flexible coupling rotating body deformation sensor based on full-flexible design provided by an embodiment of the present application; Figure 2 is a top view of a rigid-flexible coupling rotating body deformation sensor based on full-flexible design provided by an embodiment of the present application; Figure 3 is a structure schematic diagram of a micro data acquisition device; Figure 4 is a flow schematic diagram of a radial deformation measurement method of a rotating body provided by an embodiment of the present application; Figure 5 is a structure schematic diagram of an electronic device provided by an embodiment of the present application; Among them, 1 is a measured rotating body, 2 is a rigid arc, 3 is a flexible arc, 4 is a second strain gauge, 5 is a first strain gauge, 6 is a wire from a strain gauge terminal to a micro data acquisition device, and 7 is a micro data acquisition device. DETAILED DESCRIPTION

[0010] The exemplary embodiments of the present application are described below with reference to the accompanying drawings, which are included to provide a thorough understanding of embodiments of the application by a person of ordinary skill in the art, and should not be construed as a limitation on the scope of the present application. Therefore, those of ordinary skill in the art will recognize that modifications and other equivalents can be used without departing from the scope and spirit of the application. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0011] Figure 1 is a structural schematic diagram of a rigid-flex coupling rotary body deformation sensor based on a full-flexible design provided by the embodiments of the present application, Figure 2 is a top view of a rigid-flex coupling rotary body deformation sensor based on a full-flexible design provided by the embodiments of the present application. Referring to Figure 1 and Figure 2 The rigid-flex coupling rotary body deformation sensor based on a full-flexible design (hereinafter referred to as the sensor) comprises a ring-shaped main body, a micro data acquisition device 7 and a plurality of strain gauge groups.

[0012] The ring-shaped main body is a closed ring composed of a plurality of rigid arcs 2 and a plurality of flexible arcs 3 connected alternately. The rigid arcs 2 and the flexible arcs 3 are arranged in a manner that meets dynamic balance, for example, the center of mass of the ring-shaped main body should be located at the center of the ring-shaped main body, each rigid arc 2 should have the same mass (or the same mass distribution) to ensure the symmetry of the mass distribution. The number of rigid arcs 2 should be at least 2, and the centers of mass of the rigid arcs 2 must be uniformly distributed on the circumference. The geometric shape (such as arc length, curvature) of the rigid arcs 2 should be consistent to avoid local mass concentration or asymmetry. The number of flexible arcs 3 should be equal to that of the rigid arcs 2, and each flexible arc 3 connects two adjacent rigid arcs 2 to ensure the continuity of the ring. All the flexible arcs 3 should have the same stiffness (elastic modulus or spring constant) and damping characteristics. In this way, the deformation behavior of the flexible arcs 3 is consistent when rotating, which helps to maintain overall symmetry.

[0013] Optionally, the rigid arcs 2 are made of hard metal materials such as aluminum alloy processing, for example, lightweight materials such as aluminum alloy or titanium alloy, which have both strength and lightweight characteristics, and the thickness is 2 mm. The rigid arcs 2 are provided with grooves inside for installing the micro data acquisition device 7; the inner side of the rigid arcs 2 is provided with positioning grooves for ensuring that the ring-shaped main body is coaxial with the measured rotary body 1. Optionally, the flexible arcs 3 are formed by pressing film of soft materials such as silicone rubber material, with an elastic modulus of 0.5-10 MPa, for example, an arc length of 15 mm and a thickness of 1 mm. The outer surface of the flexible arcs 3 is pasted with the strain gauge group of the copper foil base through the strain adhesive; the thickness of the flexible arcs 3 is uniform, and the inner surface should be as smooth as possible. The rigid arcs 2 and the flexible arcs 3 are alternately bonded by hard colloids such as polyurethane flexible glue to form a ring-shaped main body with a set inner diameter, ensuring that there is no stress concentration at the connection site.

[0014] A plurality of strain gauge groups are arranged on the outer surface of each flexible arc 3, i.e. one strain gauge group is arranged on each flexible arc 3. The strain gauge group comprises a first strain gauge 5 and a second strain gauge 4 perpendicular to each other, the first strain gauge 5 and the second strain gauge 4 are arranged in a T-shape, the grid length of the first strain gauge 5 and the second strain gauge 4 is 2 mm, and the grid width is 1 mm. The longitudinal axis (or sensitive axis) of the first strain gauge 5 is parallel to the axial direction of the flexible arc 3, and is used to detect the axial deformation of the measured rotating body 1. The longitudinal axis of the second strain gauge 4 is perpendicular to the axial direction of the flexible arc 3, and is used to detect the radial deformation of the measured rotating body 1.

[0015] The annular body is sleeved on the measured part of the measured rotating body 1. When the measured rotating body 1 is subjected to an axial load, the radial diameter will be deformed due to the Poisson effect, and the outer circumference will change. The elastic modulus of the rigid arc 2 is large, and its deformation is small; the deformation of the outer circumference is mainly borne by the flexible arc 3. The flexible arc 3 can deform synchronously with the deformation of the rotating body, and the outer surface is pasted with a T-shaped strain gauge, and the first strain and the second strain gauge 4 capture the two-way deformation signal. When the measured rotating body 1 deforms, the flexible arc 3 deforms synchronously with it, and the T-shaped strain gauge produces resistance change due to stretching or compression. Since the elastic modulus of the flexible arc 3 is smaller than that of the rigid arc 2, the deformation of the flexible arc 3 is relatively larger under the condition that the bottom surface (i.e. the side of the flexible arc 3 in contact with the rotating body) is allowed to slide, so that the strain gauge group obtains higher strain response sensitivity. The rigid arc 2 serves as a support structure to ensure stable installation of the miniature data acquisition device 7, and its rigidity design avoids significant interference with the deformation of the measured rotating body 1. The wireless signal sending module of the miniature data acquisition device 7 maintains real-time communication with the receiving device during rotation.

[0016] A plurality of miniature data acquisition devices 7 are respectively integrated on each rigid arc 2, i.e. one miniature data acquisition device 7 is integrated on each rigid arc 2. The miniature data acquisition device 7 is connected to the first strain gauge 5 and the second strain gauge 4 through the lead wire 6 from the strain gauge terminal to the miniature data acquisition device 7. The miniature data acquisition device 7 comprises a Wheatstone bridge, a filtering module, a digital potentiometer, an analog-to-digital conversion module, a digital acquisition module, a single-chip microcomputer, a wireless signal sending module and a battery unit. Figure 3 is a structural schematic diagram of the miniature data acquisition device 7, and the functions and signal flows of each module will be described in detail below in conjunction with Figure 3 Figure 3 The red line in is the power line, and the black line is the signal line.

[0017] The strain gauge group and the miniature data acquisition device 7 have a one-to-one correspondence relationship and are connected through an electrical circuit. The strain gauge group converts the deformation into a voltage change value and sends the voltage change value to the corresponding miniature data acquisition device 7, specifically to the Wheatstone bridge of the miniature data acquisition device 7. The Wheatstone bridge offsets the initial unbalanced voltage of the strain gauge group through the balance circuit to avoid the influence of the nonlinear elasticity of the flexible arc 3 on the measurement result.​

[0018] When the Wheatstone bridge is used for strain measurement, the resistance of the four bridge arms is ideally equal when no load is applied (i.e. in the zero strain state), and the bridge output is zero. In practice, due to the small differences in the resistance values of the strain gauges themselves, the resistance of the wires, and the possible presence of static initial strain in the position (including the initial static strain caused by the flexible installation process), the bridge output is not zero when no load is applied. This non-zero voltage signal is called the initial unbalance voltage. The present embodiment artificially introduces a reverse voltage of equal size through the balance circuit (usually a precision potentiometer) of the Wheatstone bridge, to offset the initial unbalance voltage, so that the "zero point" of the entire measurement system is zeroed.

[0019] In the actual measurement process, the Wheatstone bridge sends the voltage change value after zeroing to the filtering module. The digital potentiometer is an integrated circuit whose resistance value can be controlled by a digital signal. The microcontroller (MCU) sends a digital instruction to change the tap position of the internal resistance array, thereby accurately setting the resistance value R_dpot, which is used to correct the zero point and sensitivity of the sensor. The digital potentiometer is connected to the filtering module, which filters and amplifies the voltage change value, converts it to a digital signal via an analog-to-digital conversion module, and transmits the digital signal to the single-chip microcomputer through a digital acquisition module. The single-chip microcomputer calculates the radial deformation of the measured rotating body 1 through the internal integrated algorithm, and transmits the radial deformation to the receiving device in real time through the wireless signal transmission module. The receiving device is a device that can be observed by the test personnel. The battery unit uses a 3.7V / 50mAh lithium polymer battery to power each model.

[0020] The present application discloses a kind of rigid-flex coupling rotating body deformation sensor and test method based on full flexible design, sensor is by multiple rigid arc and multiple flexible arc Composition ring main body, micro number acquisition equipment is integrated on rigid arc, and strain gauge group is arranged on flexible arc.In the radial deformation of test rotating body, strain gauge group acquires the deformation data of flexible arc, and is wirelessly transmitted to receiving device by micro number acquisition equipment on rigid arc, to realize the real-time monitoring of rotating body deformation.The present application has the advantages of strong rigid-flex coupling adaptability, high measurement sensitivity, convenient wireless transmission, can adapt to complex rotating working condition, etc., solves the problem of large rigid interference, wiring difficulty, insufficient sensitivity of traditional sensor in rotating body dynamic deformation measurement.

[0021] Figure 4 It is a kind of radial deformation measurement method flow diagram of rotating body provided by the embodiment of the present application, using the rigid-flex coupling rotating body deformation sensor based on full flexible design provided in the preceding embodiment;The method comprises the following operations: S110, from the one end of the measured rotating body into the rigid-flex coupling rotating body deformation sensor based on full flexible design.

[0022] Adjust the flexible structure to ensure that the sensor can tightly wrap the measured rotating body and can slide relative to the measured rotating body. The positioning groove on the rigid arc ensures that the annular main body is coaxial with the measured rotating body.

[0023] S120, turn on the micro data acquisition device and the receiving device.

[0024] At this time, the axial load has not been applied to the measured rotating body, the Wheatstone bridge in the micro data acquisition device offsets the initial unbalanced voltage of the strain gauge group, the digital potentiometer corrects the zero point and sensitivity of the sensor, and the wireless signal sending module establishes wireless communication with the receiving device.

[0025] S130, during the rotation of the measured rotating body around the shaft, an axial load is applied.

[0026] S140, the micro data acquisition device collects the voltage change amount generated by the strain gauge group, and converts the voltage change amount into the radial deformation amount of the measured rotating body.

[0027] Before S110, the relationship between the voltage change amount of the second strain gauge and the axial load needs to be calibrated using a standard rotating body, and the calibration process is as follows: Assume that there are m rigid arcs, and the length of each rigid arc is There are flexible arcs, and the length of each flexible arc is . It is assumed that the end face of the standard rotating body is subjected to a uniform load pressure , the other end is normally fixed constraint, and the side is free. The radius of the end face before applying the load is , and the length of the standard rotating body is .

[0028] The radial strain of the standard rotating body is There are: ; In the formula, is the Poisson's ratio of the material of the standard rotating body, is the Young's modulus of elasticity of the standard rotating body, and the total deformation of the outer periphery (i.e. the radial deformation amount) should be: ; Assuming that the deformation amount of the rigid arc is ignored, the strain of a single flexible arc is There are: ; Therefore, for a T-shaped full-bridge patch, the voltage change amount of the second strain gauge should be: ; In the above formula, is the voltage variation of the second strain gauge, is the strain of the single flexible arc, is the sensitivity coefficient of the second strain gauge, is the circuit voltage, then the relationship between the voltage variation of the measured second strain gauge and the axial load is as follows: ; Based on this, converting the voltage variation into the radial deformation of the measured rotating body includes: determining the axial load corresponding to the voltage variation of the second strain gauge according to the pre-calibrated relationship, sensor parameters and measured rotating body parameters; calculating the radial deformation of the measured rotating body according to the axial load and the measured rotating body parameters.

[0029] Specifically, in the present test process, the radial deformation of the measured rotating body is calculated according to the pre-calibrated relationship, the sensor parameters and the measured rotating body parameters. , , , K, m, n, and , the current circuit voltage V is brought into the pre-calibrated relationship to obtain the pressure value of the axial load of the measured rotating body .

[0030] The pressure value of the current axial load and the measured rotating body parameters , , are brought into the following formula to obtain the radial deformation .

[0031] ; ; S150, the radial deformation is sent to the receiving device through the wireless signal sending module.

[0032] The receiving device can receive the radial deformation of the measured rotating body in real time. Further, the real-time rotating speed of the measured rotating body is collected, and a radial deformation-rotating speed curve is drawn to realize dynamic monitoring.

[0033] The present embodiment has the following technical effects: 1. Rigid-flexible coupling design: the rigid arc provides structural support, and the flexible arc adapts to the deformation of the rotating body, while solving the problems of installation and positioning.

[0034] 2. High sensitivity measurement: the structural design of the flexible arc being shorter than the rigid arc makes the deformation concentrated in the flexible arc, and the sensitivity of the strain gauge is improved by several times.

[0035] 3. Wireless and low power consumption: The micro data acquisition device integrates wireless transmission and battery, solving the wiring problem on the rotating body. A single charge can meet long-term monitoring needs.

[0036] 4. Strong adaptability: It can adapt to rotating bodies with a diameter of more than 100mm, with an operating temperature of -20℃ to 85℃, and is suitable for aviation, wind power, machinery and other fields.

[0037] This embodiment also provides an electronic device, see Figure 5 , comprising at least one processor 301, and a memory 302 communicatively connected to the at least one processor 301; The memory 302 stores instructions that can be executed by at least one of the processors 301. The instructions are executed by at least one of the processors 301 to enable at least one of the processors 301 to execute the above-mentioned vehicle mass estimation method, thereby having at least the same advantages as the above-mentioned method.

[0038] Optionally, the electronic device also includes interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on the memory to display graphical information of a GUI (Graphical User Interface) on an external input / output device (such as a display device coupled to the interface). In other embodiments, if necessary, multiple processors can be used with multiple memories, and / or multiple buses can be used with multiple memories. Similarly, multiple electronic devices can be connected (for example, as a server array, a group of blade servers, or a multi-processor system), with each device providing part of the necessary operations.

[0039] Memory 302, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the vehicle mass estimation method in the embodiments of this application. Processor 301 executes the software programs, instructions, and modules stored in memory 301 to perform various functional applications and data processing of the device, thereby implementing the aforementioned vehicle mass estimation method.

[0040] The memory 301 can include a program storage area and a data storage area, where the program storage area can store an operating system, application programs required by at least one function, and the data storage area can store data created according to the use of the terminal, etc. In addition, the memory 302 can include a high-speed random access memory, and can further include a nonvolatile memory such as at least one of a magnetic disk storage device, a flash memory device, or other nonvolatile solid-state memory device. In some examples, the memory 302 can further include a memory remotely disposed with respect to the processor, which can be connected to the device through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0041] The electronic device can further include an input device 303 and an output device 304. The processor 301, the memory 301, the input device 303, and the output device 304 can be connected through a bus or other means.

[0042] The input device 303 can receive input digital or character information, and the output device 304 can include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), etc. The display device can include, but is not limited to, a liquid crystal display (LCD), a light emitting diode (LED) display, and a plasma display. In some embodiments, the display device can be a touch screen.

[0043] The embodiment provides a medium, where computer instructions are stored on the medium, and the computer instructions are used to make the computer execute the above method. The computer instructions on the medium are used to make the computer execute the above method, and thus at least have the same advantages as the above method.

[0044] The medium in the present application can adopt any combination of one or more computer readable media. The medium can be a computer readable signal medium or a computer readable storage medium. The medium may, for example, be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination of the above. More specific examples (non-exhaustive list) of the medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, device or apparatus.

[0045] A computer readable signal medium can include a propagated data signal with computer executable code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal can take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium can be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate or transport programming code.

[0046] Program code embodied on a computer readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire line, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0047] Computer program code for carrying out operations for aspects of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0048] It should be understood that the processes of the various embodiments can include additional or fewer steps or combinations of steps, and the steps can be performed in different orders. For example, each of the steps recited in the above description can be performed in any order or simultaneously, and the steps recited in the above description can be performed in parallel or in different orders, unless otherwise specified or required by the disclosure. Furthermore, examples of the methods can include additional acts or combinations of acts, and the acts recited in the above description can be performed in different orders or simultaneously, unless otherwise specified or required by the disclosure.

[0049] The specific embodiments described herein have been chosen for purposes of illustration and discussion. Those of ordinary skill in the art will realize that body modifications, combinations, sub-combinations, and alternatives can be made to the specific embodiments without departing from the spirit and scope of the application. Any modifications, equivalent substitutions, improvements, combinations and / or arrangements not described above are contemplated to be within the scope of the application as defined by the appended claims.

Claims

1. The rigid-flexible coupling rotating body deformation sensor based on a fully flexible design is characterized by: include: annular body; The annular body is a closed ring composed of a plurality of rigid arcs and a plurality of flexible arcs connected alternately; The rigid arc and the flexible arc are arranged in a manner to satisfy dynamic balance; Multiple miniature data acquisition devices are integrated on each rigid arc; the miniature data acquisition devices include a Wheatstone bridge, a filter module, a digital potentiometer, an analog-to-digital conversion module, a digital acquisition module, a single-chip microcomputer, a wireless signal transmission module and a battery unit; A plurality of strain gauge groups are respectively arranged on the outer surface of each flexible arc; the thickness of the flexible arc is uniform.

2. The rigid-flexible coupled rotating body deformation sensor based on a fully flexible design according to claim 1 is characterized in that: Each strain gauge group includes: a first strain gauge and a second strain gauge that are perpendicular to each other; The longitudinal axis of the first strain gauge is parallel to the axial direction of the flexible arc, and the longitudinal axis of the second strain gauge is perpendicular to the axial direction of the flexible arc.

3. The rigid-flexible coupled rotating body deformation sensor based on a fully flexible design according to claim 1 is characterized in that: The strain gauge group converts the deformation into a voltage change value, and sends the voltage change value to the micro data acquisition device.

4. The rigid-flexible coupled rotating body deformation sensor based on a fully flexible design according to claim 1 is characterized in that: The Wheatstone bridge offsets the initial unbalanced voltage of the strain gauge group through its own balancing circuit.

5. The rigid-flexible coupled rotating body deformation sensor based on a fully flexible design according to claim 1 is characterized in that: The digital potentiometer is used to correct the zero point and sensitivity of the sensor.

6. The rigid-flexible coupled rotating body deformation sensor based on a fully flexible design according to claim 1 is characterized in that: The rigid arc is made of hard metal material, and the flexible arc is formed by pressing a soft material; A groove is provided inside the rigid arc for installing a micro data acquisition device; a positioning groove is provided inside the rigid arc for ensuring that the annular body is coaxial with the rotating body to be measured; The outer surface of the flexible arc is adhered to a strain gauge group on a copper foil substrate through strain adhesive; The rigid arcs and the flexible arcs are alternately bonded by hard colloid to form an annular main body with a set inner diameter.

7. A method for measuring radial deformation of a rotating body, characterized in that: A rigid-flexible coupled rotating body deformation sensor based on a fully flexible design provided by any one of claims 1 to 6; The method comprises: A rigid-flexible coupling rotating body deformation sensor based on a fully flexible design is inserted from one end of the rotating body to be measured; Turn on the micro data acquisition device and receiving device; When the rotating body being measured rotates around its axis, an axial load is applied; The micro data acquisition device acquires the voltage variation generated by the strain gauge group and converts the voltage variation into the radial deformation of the measured rotating body; The radial deformation amount is sent to a receiving device through a wireless signal sending module.

8. The method according to claim 7, characterized in that After turning on the micro data acquisition device, including: The zero point is automatically adjusted by the micro data acquisition device.

9. The method according to claim 7, characterized in that Before inserting the rigid-flexible coupling rotating body deformation sensor based on the fully flexible design from one end of the rotating body to be measured, it also includes: Use a standard rotating body to calibrate the relationship between the voltage change of the second strain gauge and the axial load. The calibration formula is: ； in, is the voltage change of the second strain gauge, K is the strain gauge sensitivity coefficient, V is the circuit voltage, is the length of a single rigid arc, is the length of a single flexible arc, m is the number of rigid arcs, n is the number of flexible arcs, is the end face radius of the standard rotating body before the load is applied, is the Poisson's ratio of the material of the standard body of revolution, is the pressure value of the axial load, is the Young's modulus of elasticity of the standard body of revolution; The converting of the voltage variation into the radial deformation of the measured rotating body comprises: Determine the pressure value of the axial load corresponding to the voltage change of the second strain gauge based on a pre-calibrated relationship, sensor parameters, and parameters of the measured rotating body; The radial deformation of the measured rotating body is calculated according to the pressure value of the axial load and the parameters of the measured rotating body.

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