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

Abstract

This application relates to the field of sensor technology, specifically to a deformation sensor and testing method for a rigid-flexible coupled rotating body based on a fully flexible design. The sensor includes a ring-shaped main body; the ring-shaped main body is a closed loop composed of multiple alternating rigid arcs and multiple flexible arcs; the rigid and flexible arcs are arranged to satisfy dynamic balance; multiple miniature data acquisition devices are integrated on each rigid arc; each miniature data acquisition device includes a Wheatstone bridge, a filter module, a digital potentiometer, an analog-to-digital converter, a digital acquisition module, a microcontroller, a wireless signal transmission module, and a battery unit; multiple strain gauge groups are respectively arranged on the outer surface of each flexible arc; the flexible arcs have a uniform thickness. This application achieves deformation adaptation and high-sensitivity measurement through an alternating rigid-flexible arc structure, and enables convenient monitoring under rotating conditions through wireless communication miniature data acquisition devices.

Description

TECHNICAL FIELD

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

[0002] In the field of rotary machinery, deformation monitoring of rotary 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:

[0003] Firstly, the sensor with rigid structure, such as eddy current sensor, is usually installed by means of fixed support for deformation monitoring of rotary body structure. This kind of installation method may introduce additional stiffness to the rotary 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 the rotary body, and there are problems such as cable winding and breakage caused by rotary motion, which easily causes the failure of the measurement system and lacks reliability.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The purpose of the present application is to provide a rigid-flexible coupling rotary 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 rotary working condition through a miniature data acquisition device of wireless communication.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] In the first aspect, the present application provides a rigid-flexible coupling rotary body deformation sensor based on a full-flexible design, comprising:

[0008] 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;

[0009] 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;

[0010] A plurality of strain gauge groups arranged on the outer surface of each flexible arc respectively; the thickness of the flexible arc is uniform.

[0011] In the second aspect, the present application provides a radial deformation measurement method of a rotary body, which adopts the rigid-flexible coupling rotary body deformation sensor based on a full-flexible design provided by the present application.

[0012] The method comprises:

[0013] The rigid-flexible coupling rotating body deformation sensor based on the full-flexible design is sleeved from one end of the measured rotating body;

[0014] The micro data acquisition device and the receiving device are started;

[0015] During the self-rotation of the measured rotating body around the shaft, the axial load is applied;

[0016] The micro data acquisition device collects the voltage variation generated by the strain gauge group, and converts the voltage variation into the radial deformation of the measured rotating body;

[0017] The radial deformation is sent to the receiving device through the wireless signal sending module.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The present application discloses a rigid-flexible coupling rotating body deformation sensor based on a 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. The micro data acquisition device is integrated on the rigid arc, and the strain gauge group is arranged on the flexible arc. When testing 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, thereby realizing 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, etc., and solves the problems of large rigid interference, weak deformation signal, difficult wiring, and insufficient sensitivity of the traditional sensor in the dynamic deformation measurement of the rotating body. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0021] Figure 1 is a structure schematic diagram of a rigid-flexible coupling rotating body deformation sensor based on a full-flexible design provided by an embodiment of the present application;

[0022] Figure 2 is a top view of a rigid-flexible coupling rotating body deformation sensor based on a full-flexible design provided by an embodiment of the present application;

[0023] Figure 3 is a structure schematic diagram of a micro data acquisition device;

[0024] Figure 4 is a flowchart of a method for measuring radial deformation of a rotating body according to an embodiment of the present application;

[0025] Figure 5 is a structural diagram of an electronic device according to an embodiment of the present application;

[0026] wherein 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

[0027] Exemplary embodiments of the present application are described herein with reference to the accompanying drawings, which are meant to be exemplary. It should be understood, therefore, that various changes and modifications to the embodiments described herein can be made by those having ordinary skill in the art without departing from the scope and spirit of the application. Likewise, the description herein is meant to be exemplary only and therefore specific values and details known to those having ordinary skill in the art are omitted for the sake of clarity and understanding.

[0028] Figure 1 is a structural diagram of a rigid-flex coupled rotating body deformation sensor based on a full-flex design according to an embodiment of the present application, Figure 2 is a top view of a rigid-flex coupled rotating body deformation sensor based on a full-flex design according to an embodiment of the present application. Referring to Figure 1 and Figure 2 The rigid-flex coupled rotating body deformation sensor based on a full-flex 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.

[0029] 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 satisfies 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, and each rigid arc 2 should have the same mass (or the same mass distribution) to ensure symmetrical mass distribution. The number of rigid arcs 2 should be at least two, and their centers of mass 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 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.

[0030] Optionally, the rigid arc 2 is made of hard metal materials such as aluminum alloy, for example, lightweight materials such as aluminum alloy or titanium alloy, which have the characteristics of strength and lightweight, and the thickness is 2 mm. The rigid arc 2 is internally provided with a groove for installing the micro data acquisition device 7; the inner side of the rigid arc 2 is provided with a positioning groove for ensuring the coaxiality of the annular body and the measured rotating body 1. Optionally, the flexible arc 3 is formed by pressing film of soft materials such as silicone rubber, and the elastic modulus is 0.5-10 MPa, for example, the arc length is 15 mm and the thickness is 1 mm. The outer surface of the flexible arc 3 is pasted with a strain gauge group on a copper foil base; the thickness of the flexible arc 3 is uniform, and the inner surface should be as smooth as possible. The rigid arc 2 and the flexible arc 3 are alternately bonded by hard colloids such as polyurethane flexible glue to form an annular body with a set inner diameter, ensuring that there is no stress concentration at the connection part.

[0031] A plurality of strain gauge groups are arranged on the outer surface of each flexible arc 3, that is, one strain gauge group is arranged on each flexible arc 3. The strain gauge group includes: 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, and 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, which 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, which is used to detect the radial deformation of the measured rotating body 1.

[0032] The annular body is sleeved on the measured part of the measured rotating body 1, and when the measured rotating body 1 is subjected to axial load, its radial diameter will be deformed due to the Poisson effect, and the outer circumference will change. The rigid arc 2 has a large elastic modulus, 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 and second strain gauges 4 capture the bidirectional 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 changes 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 micro data acquisition device 7, and its rigidity design avoids significant interference with the deformation of the measured rotating body 1. The wireless signal transmission module of the micro data acquisition device 7 maintains real-time communication with the receiving device during rotation.

[0033] A plurality of micro data acquisition devices 7 are integrated on each rigid arc 2, that is, one micro data acquisition device 7 is integrated on each rigid arc 2. The micro data acquisition device 7 is connected with the first strain gauge 5 and the second strain gauge 4 through the lead wire 6 from the strain gauge terminal to the micro data acquisition device 7. The micro data acquisition device 7 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. Figure 3 is a structural schematic diagram of the micro data acquisition device 7, and the functions and signal flows of various modules will be described in detail below, Figure 3 Figure 3 The red line is a power line, and the black line is a signal line.

[0034] The strain gauge set has a one-to-one correspondence with the micro data acquisition device 7 and is connected through an electrical line. The strain gauge set converts the deformation into a voltage change value and sends the voltage change value to the corresponding micro data acquisition device 7, specifically the Wheatstone bridge of the micro data acquisition device 7. The Wheatstone bridge offsets the initial unbalanced voltage of the strain gauge set through the self-contained balancing circuit to avoid the influence of the nonlinear elasticity of the flexible arc 3 on the measurement results.

[0035] When the Wheatstone bridge is used for strain measurement, in the unloaded state (i.e. in the zero strain state), the resistances of the four bridge arms are equal in the ideal case, and the bridge output is zero. In the actual case, due to the slight difference in the resistance value of the strain gauge itself, the lead wire resistance, and the possible static initial strain in the position (including the initial static strain caused by the flexible installation process), the bridge output is not zero when unloaded. This non-zero voltage signal is called initial unbalanced voltage. This embodiment artificially introduces a reverse voltage of the same size through the balancing circuit (usually a precision potentiometer) self-contained in the Wheatstone bridge to offset the initial unbalanced voltage, so that the "zero point" of the entire measurement system is zeroed.

[0036] 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 into a digital signal via the analog-digital conversion module, and transmits the digital signal to the single-chip microcomputer through the digital acquisition module. The single-chip microcomputer calculates the radial deformation variable of the current measured rotating body 1 through the internal integrated algorithm and sends the radial deformation variable in real time to the receiving device through the wireless signal sending module. The receiving device is the device that can be observed by the test personnel. The battery unit uses a 3.7V / 50mAh lithium polymer battery to supply power to each model.

[0037] ​This application discloses a rigid-flexible coupling deformation sensor and testing method for a rotating body based on a fully flexible design. The sensor consists of a ring-shaped main body composed of multiple rigid arcs and multiple flexible arcs. A miniature data acquisition device is integrated on the rigid arcs, and strain gauge arrays are arranged on the flexible arcs. When testing the radial deformation of the rotating body, the strain gauge arrays collect the deformation data of the flexible arcs and wirelessly transmit it to the receiving device via the miniature data acquisition device on the rigid arcs, achieving real-time monitoring of the rotating body's deformation. This application has advantages such as strong rigid-flexible coupling adaptability, high measurement sensitivity, convenient wireless transmission, and adaptability to complex rotational conditions, solving the problems of large rigid interference, difficult wiring, and insufficient sensitivity of traditional sensors in the dynamic deformation measurement of rotating bodies.

[0038] Figure 4 This is a flowchart illustrating a method for measuring the radial deformation of a rotating body according to an embodiment of this application. It employs a rigid-flexible coupling rotating body deformation sensor based on a fully flexible design, as provided in the aforementioned embodiment. The method includes the following operations:

[0039] S110. Insert a rigid-flexible coupling deformation sensor based on a fully flexible design into one end of the rotating body being measured.

[0040] The flexible structure is adjusted to ensure that the sensor can both tightly grip the rotating object being measured and allow for relative sliding. Positioning grooves on the rigid arc ensure that the annular body is coaxial with the rotating object being measured.

[0041] S120, Turn on the miniature data acquisition device and receiving device.

[0042] At this point, no axial load has been applied to the rotating body under test. The Wheatstone bridge in the micro data acquisition device cancels 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 transmission module establishes wireless communication with the receiving device.

[0043] S130. During the rotation of the tested rotating body around its axis, an axial load is applied.

[0044] S140: The micro data acquisition device collects the voltage change generated by the strain gauge group and converts the voltage change into the radial deformation of the measured rotating body.

[0045] Before step S110, a standard rotating body is required to calibrate the relationship between the voltage change of the second strain gauge and the axial load. The calibration process is as follows:

[0046] Assume there are m rigid arcs, each with a length of m. ,have There are 3 flexible arcs, each with a length of 1. Assume that the end face of a standard rotating body is subjected to a uniformly distributed load. and the other end is a normal fixed constraint, and the side is free. , the length of the standard rotating body is .

[0047] The radial strain of the standard rotating body is .

[0048] ;

[0049] 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) should be:

[0050] ;

[0051] Assuming that the deformation of the rigid arc is ignored, the strain of a single flexible arc is .

[0052] ;

[0053] The voltage change of the second strain gauge for a T-shaped full-bridge patch mode is .

[0054] ;

[0055] In the formula, is the voltage change of the second strain gauge, is the strain of a single flexible arc, is the sensitivity coefficient of the second strain gauge, and is the circuit voltage, and the relationship between the measured voltage change of the second strain gauge and the axial load is as follows:

[0056] ;

[0057] Based on this, converting the voltage change into the radial deformation of the measured rotating body includes: determining the axial load corresponding to the voltage change of the second strain gauge according to the pre-calibrated relationship, sensor parameters and measured rotating body parameters; and calculating the radial deformation of the measured rotating body according to the axial load and the measured rotating body parameters.

[0058] Specifically, in the present test process, the , , , K, m, n, and ​, the current circuit voltage V is brought into the pre-calibrated relationship, and the pressure value of the axial load of the measured rotating body is obtained .

[0059] The pressure value of the current axial load and the measured rotating body parameters , , , are brought into the following formula, and the radial deformation variable .

[0060] ;

[0061] ;

[0062] S150, the radial deformation variable is sent to the receiving device through the wireless signal sending module.

[0063] The receiving device can receive the radial deformation variable of the measured rotating body in real time. Further, the real-time rotating speed of the measured rotating body is collected, the radial deformation variable-rotating speed curve is drawn, and dynamic monitoring is realized.

[0064] The embodiment has the following technical effects:

[0065] 1. Rigid-flexible coupling design: rigid arc provides structural support, and flexible arc adapts to the deformation of the rotating body, while solving the installation and positioning problems.

[0066] 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 strain gauge measurement sensitivity is improved by several times.

[0067] 3. Wireless and low power consumption: the miniature data acquisition device integrates wireless transmission and battery, solves the wiring problem on the rotating body, and single charging can meet the long-term monitoring demand.

[0068] 4. Strong adaptability: can adapt to rotating bodies with a diameter of more than 100mm, working temperature of-20℃ to 85℃, and is suitable for aviation, wind power, machinery and other fields.

[0069] The embodiment also provides an electronic device, see Figure 5 , comprising at least one processor 301 and a memory 302 in communication connection with the at least one processor 301;

[0070] The memory 302 stores instructions executable by the at least one processor 301, and the instructions are executed by the at least one processor 301 to enable the at least one processor 301 to execute the whole vehicle mass estimation method described above, thus having at least the same advantages as the above method.

[0071] Optionally, an interface can be included to enable the various components to communicate with one another and with other devices or systems. In this regard, various buses or other interconnections - either physical or virtual, wired or wireless - can be used to enable the communication of information between each component and the other devices coupled to the system. Additionally, the various components can be installed on a common motherboard or in other manners, as desired. With such an arrangement, the processor can be configured to process instructions stored in the memory or otherwise accessible to the processor to display graphical information for a GUI on an external input / output device, such as a display device coupled to the interface. Alternatively, hardwired circuitry can be used in place of or in combination with software instructions to implement processes consistent with the disclosure. Embodiments can also be directed to machine-readable media containing instructions for performing any of the disclosed operations. Such machine-readable media can form a computer program product. The software instructions can be frames-based, object-oriented, or any other appropriate software object-based, and / or any appropriate software or hardware configured to implement the techniques of the disclosure.

[0072] The memory 302, as a computer readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the whole vehicle mass estimation method in the embodiments of the present application. The processor 301 executes various function applications and data processing of the device by running the software programs, instructions and modules stored in the memory 301, that is, implements the whole vehicle mass estimation method described above.

[0073] The memory 301 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; 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 also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 302 can further include a memory remotely arranged 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.

[0074] The electronic device can also 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 by a bus or other means.

[0075] 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 (for example, an LED), a tactile feedback device (for example, a vibration motor), and the like. 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.

[0076] The embodiment provides a medium, which stores computer instructions for making a computer execute the method described above. The computer instructions on the medium are used for making the computer execute the method described above, thus at least having the same advantages as the method described above.

[0077] The medium in the 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, apparatus or device.

[0078] The computer readable signal medium can include a data signal propagated in baseband or propagated as a carrier wave in a propagated data signal, in which the computer readable program code is contained. Such propagated data signal can take many forms, including but not limited to electro-magnetic, optical or any suitable combination thereof. The computer readable signal medium can also be any computer readable medium that can send, propagate or transfer a program for use by or in connection with an instruction execution system, apparatus or device.

[0079] The program code contained on the computer readable medium can be transmitted in any suitable medium, including but not limited to wireless, wire line, optical cable, RF (Radio Frequency), etc., or any suitable combination thereof.

[0080] Computer program code for carrying out operations 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).

[0081] It should be understood that the steps recited above can be reordered, added to, or removed, using the various forms of flow illustrated above. For example, the steps recited in this application can be performed in parallel, in series, or in a different order, without limitation herein, so long as the desired results of the technology disclosed in this application are achieved.

[0082] The specific embodiments have been shown and described for purposes of illustrating the embodiments, and not for purposes of limitation. It will be clear to those skilled in the art that various modifications, combinations, sub-combinations and alternatives can be made to the specific embodiments without departing from the spirit and principles of the application. Any further modifications, changes, improvements, combinations, sub-combinations, alternatives, and the like made to the specific embodiments relate, by way of example only, to further implementations of the technology disclosed in this application.

Claims

1. A rigid-flexible coupled rotary body deformation sensor based on a full-flexible design, characterized in that, include: Ring-shaped main body; The annular body is a closed loop composed of multiple rigid arcs and multiple flexible arcs connected alternately; The rigid arcs and flexible arcs are arranged in a manner that satisfies 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 converter module, a digital acquisition module, a microcontroller, a wireless signal transmission module, and a battery unit; Multiple 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 coupling rotary body deformation sensor based on a full-flexible design of claim 1, wherein, 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 coupling rotary body deformation sensor based on a full-flexible design of claim 1, wherein, The strain gauge group converts deformation into voltage change values ​​and sends the voltage change values ​​to the micro data acquisition device. 4.The rigid-flexible coupling rotary body deformation sensor based on a full-flexible design of claim 1, wherein, The Wheatstone bridge uses its built-in balancing circuit to counteract the initial unbalanced voltage of the strain gauge assembly. 5.The rigid-flexible coupling rotator deformation sensor based on a full-flexible design of claim 1, wherein, The digital potentiometer is used to correct the zero point and sensitivity of the sensor. 6.The rigid-flexible coupling rotator deformation sensor based on a full-flexible design of claim 1, wherein, The rigid arc is made of hard metal material, and the flexible arc is formed by pressing a soft material. The rigid arc has a groove inside for mounting a micro data acquisition device; the rigid arc has a positioning groove on its inner side to ensure that the annular body is coaxial with the rotating body being measured. The outer surface of the flexible arc is bonded with a strain gauge assembly of a copper foil substrate by strain adhesive. The rigid arc and the flexible arc are alternately bonded together by a hard colloid to form a ring-shaped body with a set inner diameter.

7. A method of measuring a radial deformation of a rotating body, characterized by, The rigid-flexible coupled rotating body deformation sensor based on a fully flexible design, as provided in any one of claims 1 to 6, is adopted; The method includes: A rigid-flexible coupling deformation sensor based on a fully flexible design is inserted from one end of the rotating body being measured. Turn on the miniature data acquisition and receiving devices; An axial load is applied during the rotation of the tested rotating body around its axis; The micro data acquisition device collects the voltage change generated by the strain gauge group and converts the voltage change into the radial deformation of the measured rotating body; The radial deformation is transmitted to the receiving device via a wireless signal transmitting module.

8. The method of claim 7, wherein, After activating the miniature data acquisition device, the following steps are included: The zero point is automatically adjusted by the micro data acquisition device.

9. The method of claim 7, wherein, Before inserting the rigid-flexible coupling deformation sensor based on a fully flexible design into one end of the rotating body under test, the following steps are also included: Using a standard rotating body, the relationship between the voltage change of the second strain gauge and the axial load is calibrated. The calibration formula is as follows: ； wherein, is a voltage change amount of the second strain gauge, K is a strain gauge sensitivity coefficient, V is a circuit voltage, is a length of a single rigid arc, is a length of a single flexible arc, m is the number of rigid arcs, and n is the number of flexible arcs, is an end face radius of a standard rotating body before a load is applied, is a Poisson's ratio of a standard rotating body material, is a pressure value of an axial load, is a Young's modulus of elasticity of a standard rotating body; The process of converting the voltage change into the radial deformation of the measured rotating body includes: Based on the pre-calibrated relationship, sensor parameters, and parameters of the rotating body under test, determine the pressure value of the axial load corresponding to the voltage change of the second strain gauge; The radial deformation of the rotating body under test is calculated based on the pressure value of the axial load and the parameters of the rotating body under test.

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