Rotor real-time dynamic monitoring system based on RFID passive tag detection

Abstract

The application discloses a rotor real-time dynamic monitoring system based on RFID passive tag detection, relates to the field of RFID non-contact passive sensing, and comprises a rotor, a strain detection tag, an angle detection tag, a tag support, a reader antenna, a tag reader and a high-speed computer. The application has the advantages of passive non-contact dynamic detection, small required sensor volume, small influence on rotor system dynamic performance, strong method robustness, low cost, fast detection speed, no need of additional complex sensors, certain generality of the detection method, construction of the rotor real-time dynamic monitoring system based on RFID passive tag detection, fusion of phase information and RSSI information of a multi-tag array, realization of multi-physical quantity detection of rotor real-time dynamic strain, dynamic torque, dynamic torsion angle and dynamic torsion stiffness, and strong comprehensive detection performance.

Description

Technical Field

[0001] This invention relates to the field of RFID passive non-contact sensing, specifically to a real-time dynamic monitoring system for rotors based on RFID passive tag detection. Background Technology

[0002] Currently, there are many monitoring technologies for rotor systems, mainly used to monitor rotor torque, torsional angle, and torsional stiffness. Rotor torque monitoring primarily utilizes torque sensors coaxially connected to the rotor, requiring pre-installation of the sensor. For actual operating rotor systems, sensor installation space is limited and installation is complex. Rotor torsional angle monitoring mainly employs static measurement methods. A fixed measuring arm is mounted at one end of the rotor, extending radially and swinging synchronously with rotor torsion. Torque is applied by adding weights to the end of the arm, and the movement distance of the arm is detected and converted into torsional angle. Rotor torsional stiffness is calculated as the ratio of torque to torsional angle. Current methods for measuring rotor torsional angle, torsional stiffness, and strain are all static; methods for measuring dynamic rotor torsional angle, dynamic torsional stiffness, and dynamic strain are not yet available.

[0003] Meanwhile, RFID passive sensing technology, as a passive sensing technology, has developed rapidly in the non-contact sensing of various physical quantities. It has advantages such as small tag size, simple structure, convenient deployment, low cost, and high sensing accuracy. It also has unique advantages in multi-point vibration measurement deployment in complex environments and confined spaces, irregular surface deployment, and three-dimensional sensing. Therefore, combining RFID technology to realize real-time dynamic monitoring of rotors has strong technical prospects and provides a new idea and method for rotor condition monitoring. Summary of the Invention

[0004] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0005] Therefore, embodiments of the present invention propose a real-time dynamic monitoring system for rotors based on RFID passive tag detection, comprising: a rotor, a strain detection tag, an angle detection tag, a tag bracket, a reader antenna, a tag reader, and a high-speed computer;

[0006] The strain detection tag is set on the rotor circumferential surface to monitor the rotor's dynamic strain and torque;

[0007] The angle detection tag is set on the rotor circumference to monitor the rotor's torsional angle in that area;

[0008] The label holder is set on the rotor circumference and the angle detection label is fixed to ensure that the angle detection label is stably arranged along the rotor length direction along the axis.

[0009] The reader antenna array is arranged around the rotor to achieve full coverage monitoring of the rotor rotation process;

[0010] One end of the tag reader is connected to the reader antenna, and the other end is connected to a high-speed computer for transmitting signals;

[0011] The high-speed computer is used to control the tag reader to start up, transmit signals, and process the backscatter information after each tag is decoded. Then, based on the tag's phase and received signal strength (RSSI) information, it calculates the measured rotor dynamic strain, torque, torsional angle, and torsional stiffness.

[0012] Furthermore, there are two strain detection tags, which are set at 90° to each other and at 45° to the rotor axis. The strain detection tags have microstrip antennas.

[0013] Furthermore, the angle detection tag is fixed to the rotor surface by a tag bracket, and two angle detection tags are set on the rotor circumference along the axial direction, with the two angle detection tags arranged at a certain interval.

[0014] Furthermore, the label holder is configured in an arc shape at the end near the rotor.

[0015] Furthermore, the reader antennas are respectively arranged vertically above, horizontally to the left, vertically below, and horizontally to the right of the rotor system, with the reader antennas facing the tag and the distance between the reader antennas and the rotor set to 0.5m.

[0016] Furthermore, one end of the tag reader is connected to the reader antenna via a feed line, and the other end is connected to a high-speed computer.

[0017] Furthermore, a monitoring method for a rotor real-time dynamic monitoring system based on RFID passive tag detection includes the following steps:

[0018] 1) The torque of the rotor is detected using strain gauges to establish the relationship between strain and RSSI value, and the strain is calibrated using RSSI value;

[0019] 2) By using two strain detection tags arranged at 90° to each other and 45° to the rotor axis, the detection results are differentially processed to improve the sensitivity of strain detection and obtain the real-time strain information of the rotor.

[0020] 3) The rotor torque is obtained through the formulas for strain and torque, with the following relationship:

[0021]

[0022] Where M is the rotor torque, G is the shear modulus of the rotor material, D is the rotor diameter, and ε 45 and ε 135 These represent the strain at angles of 45° and 135° to the axis, respectively.

[0023] The dynamic torque of the rotor can be calculated from the above formula. Real-time calculation can be achieved by using a high-speed computer to improve the calculation capability of dynamic strain and dynamic torque of the rotor system.

[0024] 4) Use angle detection tags to detect the rotor's torsional angle, calibrate the initial phase information of the two angle detection tags in the same direction, and determine the initial phase state;

[0025] 5) Arrange the angle detection tags along the axial direction and detect the phase information of the two angle detection tags before and after the rotor twists;

[0026] 6) Perform smoothing filtering and difference processing on the phase information of the two angle detection tags. Based on the influence law of the relative position of the angle detection tags on the tag phase difference, establish the correspondence between the phase difference of the angle detection tags and the torsion angle. Use the phase difference to obtain the rotor torsion angle. Use a high-speed computer to improve the calculation capability of the dynamic torsion angle of the rotor system to achieve real-time calculation.

[0027] 7) Based on the rotor dynamic torque obtained in 3) and the rotor torsional angle obtained in 6), substitute them into the following formula to calculate the rotor's calculated dynamic torsional stiffness:

[0028]

[0029] Where φ is the rotor's torsional angle, M is the rotor's calculated dynamic torsional stiffness, l is the distance from the fixed end to the loading plane, and GI p This is called torsional stiffness.

[0030] The dynamic torsional stiffness of the rotor can be calculated using the above formula. Real-time calculation can be achieved by using a high-speed computer to improve the calculation capability of the dynamic torque stiffness of the rotor system.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. The advantages of this invention are that it is a passive, non-contact dynamic detection method, which requires a small sensor size, has little impact on the dynamic performance of the rotor system, is robust, low-cost, fast in detection, does not require additional complex sensors, and has a certain degree of versatility.

[0033] 2. The rotor torque detection method used employs two strain detection tags equipped with microstrip antennas, arranged at 90° to each other and 45° to the rotor axis. Compared with the existing surface acoustic wave tag torque detection method, it does not require additional PCB boards and leads, has strong anti-metal performance, can be adapted to different curved surfaces, is simple and convenient to set up, and has low detection cost and is economical and practical.

[0034] 3. The rotor torsion angle detection method adopted uses two coaxial angle detection tags for detection. The angle is detected by using the phase difference between the two tags collected by the tag reader. The passive non-contact method eliminates the need for complex angle detection devices, making it simple and convenient.

[0035] 4. The tag information reflecting the rotor's dynamic torque and the tag information reflecting the rotor's dynamic torsional angle are decoupled, eliminating the influence of the rotation process on dynamic torque monitoring, effectively improving the accuracy of tag monitoring of dynamic torque, and ensuring real-time high-precision monitoring of the rotor.

[0036] 5. A real-time dynamic monitoring system for rotors based on RFID passive tag detection was constructed. By integrating the phase information and RSSI information of multiple tag arrays, it can realize the detection of multiple physical quantities of rotor in real time, including dynamic strain, dynamic torque, dynamic torsional angle and dynamic torsional stiffness, and has strong comprehensive detection performance. Attached Figure Description

[0037] Figure 1 This is a front view of the rotor dynamic real-time monitoring system of the present invention;

[0038] Figure 2 This is a top view of the rotor dynamic real-time monitoring system of the present invention;

[0039] Figure 3 This is a side view of the components of the rotor dynamic real-time monitoring system of the present invention;

[0040] Figure 4 This is a schematic diagram of the rotor dynamic real-time monitoring system of the present invention;

[0041] Figure 5 This is a flowchart of the rotor dynamic real-time monitoring method of the present invention.

[0042] Reference numerals: 1. Rotor, 2. Strain detection tag, 3. Angle detection tag, 4. Tag holder, 5. Reader antenna, 6. Tag reader, 7. High-speed computer. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] like Figures 1-5 As shown, an embodiment of the present invention proposes a real-time dynamic monitoring system for rotors based on RFID passive tag detection, comprising: rotor 1, strain detection tag 2, angle detection tag 3, tag bracket 4, reader antenna 5, tag reader 6, and high-speed computer 7;

[0045] The strain detection tag 2 is set on the circumferential surface of the rotor 1 to monitor the dynamic strain and torque of the rotor 1;

[0046] The angle detection tag 3 is set on the circumferential surface of the rotor 1 to monitor the torsional angle of the rotor 1 in this area;

[0047] The label bracket 4 is set on the circumference of the rotor 1 and the angle detection label 3 is fixed thereon, so that the angle detection label 3 is stably arranged along the axis in the length direction of the rotor 1.

[0048] The reader antenna 5 array is arranged around the rotor 1 to achieve full coverage monitoring of the rotor 1's rotation process;

[0049] One end of the tag reader 6 is connected to the reader antenna 5, and the other end is connected to the high-speed computer 7 for transmitting signals;

[0050] The high-speed computer 7 is used to control the tag reader 6 to start, transmit signals, and process the backscatter information after each tag is decoded. Then, based on the tag's phase and received signal strength (RSSI) information, it calculates the measured dynamic strain, torque, torsional angle, and torsional stiffness of the rotor 1.

[0051] Preferably, there are two strain detection tags 2, which are set at 90° to each other and at 45° to the axis of rotor 1. The strain detection tags 2 have microstrip antennas, with the long axis of the microstrip antennas along the direction of the maximum strain of the rotor, to collect the strain in two directions.

[0052] Preferably, the angle detection tag 3 is fixed to the surface of the rotor 1 by a tag bracket 4. Two angle detection tags 3 are arranged on the circumference of the rotor 1 along the axial direction, with a certain interval between them. The angle detection tags 3 are arranged on the tag bracket 4 in the area to be measured along the axial direction of the rotor 1. The rotation of the tag bracket 4 is caused by the torsion of the rotor 1. The phase information difference between the two angle detection tags 3 arranged on the tag bracket 4 is detected. The relative rotation of the two angle detection tags 3 is reflected as a relative change in phase in the phase information. The relationship between the torsion angle of the rotor 1 and the phase information is established, and then the torsion angle of the rotor 1 is obtained by the detected phase information difference.

[0053] Two angle detection tags 3 are deployed along the same axis along the rotor 1 axis to reflect the phase signals at the two positions. By running the corresponding algorithm, the strain, torque and torsional angle of rotor 1 can be calculated respectively, and then the dynamic torsional stiffness of rotor 1 can be obtained.

[0054] In one embodiment, the strain detection tag 2 and angle detection tag 3 are anti-metal UHF RFID tags, employing a flexible anti-metal substrate and arranged using adhesive for easy installation and removal. To further prevent the RFID tags from falling off during rotor 1 operation, a layer of adhesive tape can be pasted onto the upper surface of the RFID tags during installation. The size of the RFID tags can be adjusted according to different rotors 1 and arrangement methods, achieving portable monitoring while ensuring reading performance.

[0055] Preferably, the label holder 4 is arc-shaped at one end near the rotor 1. In one embodiment, the label holder 4 can be made of lightweight aluminum alloy material that is easy to process. Under the premise of ensuring that it fits the surface of the rotor 1, it is firmly attached to the surface of the rotor 1 by means of adhesive or magnetic attraction and rotates with the rotor 1.

[0056] The label holder 4 is designed to ensure that the torsional angle detection label 3 and the rotor 1 rotate in the same direction. This requires that the lower surface of the label holder 4 be in strict contact with the rotor system. This can be achieved by using adhesive, magnetic attraction, or bolts to ensure that the torsional changes of the rotor 1 are rigidly transmitted to the label holder 4. It is recommended that the label holder 4 be made of a high-rigidity, lightweight aluminum alloy. To ensure that the label holder 4 is strictly aligned along the axis, a spirit level is used to calibrate the top plane of the label holder 4, ensuring sufficient accuracy in their relative positions.

[0057] Preferably, the reader antennas 5 are respectively arranged vertically above, horizontally to the left, vertically below, and horizontally to the right of the rotor 1 system, with the reader antennas 5 facing the tag and the distance between the reader antennas 5 and the rotor 1 set to 0.5m. Two reader antennas 5 are directly opposite the angle detection tag 3, i.e., along the axis of the rotor 1; two reader antennas 5 are directly opposite the strain detection tag 2, i.e., along the radial direction of the rotor 1. This arrangement aims to ensure the reading efficiency and dynamic detection accuracy of the RFID tags, achieving full coverage of RFID tag detection during the rotation of the rotor 1.

[0058] Preferably, one end of the tag reader 6 is connected to the reader antenna 5 via a feed line, and the other end is connected to the high-speed computer 7. In one embodiment, the tag reader 6 can be deployed at a position 3-5m away from the rotor 1 system, without needing to be strictly close to the rotor 1 system, thus avoiding the trouble of placing it close to the rotor 1 and making it easy to adapt to various actual scenarios. The feed line connected to the reader antenna 5 can be selected to be thicker to shield the interference of surrounding electromagnetic waves.

[0059] The high-speed computer 7 is used to collect and process the phase and RSSI information of multiple tags. The strain detection tags 2 are pasted at 90° to each other. The collected RSSI information is used to establish the relationship with strain. The dynamic torque of rotor 1 is obtained through the calculation formula of strain and rotor 1 torque. At the same time, the relationship between the phase information of angle detection tag 3 and the torsion angle is established to realize the dynamic torsion angle monitoring of rotor 1. Finally, the dynamic torsional stiffness is obtained.

[0060] A monitoring method for a rotor real-time dynamic monitoring system based on RFID passive tag detection includes the following steps:

[0061] 1) The torque of rotor 1 is detected using strain detection tag 2. Based on the properties of the microstrip antenna of strain detection tag 2, that is, the strain of the tag along the long axis is linearly related to the RSSI value of strain detection tag 2, the relationship between strain and RSSI value is established, and the strain is calibrated by RSSI value.

[0062] 2) Using two strain detection tags 2 arranged on rotor 1 at 90° to each other and 45° to the axis of rotor 1, the detection results are differentially processed to improve the sensitivity of strain detection and obtain the real-time strain information of rotor 1.

[0063] 3) The torque of rotor 1 is obtained through the formulas for strain and torque, and the relationship is as follows:

[0064]

[0065] Where M is the torque of rotor 1, G is the shear modulus of rotor 1 material, D is the diameter of rotor 1, and ε 45 and ε 135 These represent the strain at angles of 45° and 135° to the axis, respectively.

[0066] The dynamic torque of rotor 1 can be calculated from the above formula. The high-speed computer 7 is used to improve the calculation ability of dynamic strain and dynamic torque of rotor 1 system to achieve real-time calculation.

[0067] 4) Use angle detection tag 3 to detect the torsional angle of rotor 1, calibrate the initial phase information of the two angle detection tags 3 in the same direction, and determine the initial phase state.

[0068] 5) Arrange the angle detection tag 3 along the axial direction and detect the phase information of the two angle detection tags 3 before and after the rotor 1 is twisted;

[0069] 6) Perform smoothing filtering and difference processing on the phase information of the two angle detection tags 3. Based on the influence law of the relative position of the angle detection tags 3 on the tag phase difference, establish the correspondence between the phase difference of the angle detection tags 3 and the torsion angle. Use the phase difference to obtain the torsion angle of the rotor 1. Use the high-speed computer 7 to improve the calculation capability of the dynamic torsion angle of the rotor 1 system to achieve real-time calculation.

[0070] 7) Based on the dynamic torque of rotor 1 obtained in 3) and the torsional angle of rotor 1 obtained in 6), substitute them into the following formula to calculate the dynamic torsional stiffness of rotor 1:

[0071]

[0072] Where φ is the torsional angle of rotor 1, M is the torque of rotor 1, l is the distance from the fixed end to the loading plane, and GI p This is called torsional stiffness.

[0073] The dynamic torsional stiffness of rotor 1 can be calculated using the above formula. Real-time calculation is achieved by utilizing a high-speed computer 7 to enhance the calculation capability of the dynamic torque stiffness of the rotor 1 system.

[0074] This invention enables passive, non-contact, real-time dynamic monitoring of the strain, torque, torsional angle, and torsional stiffness of rotor 1.

[0075] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A monitoring method for a rotor real-time dynamic monitoring system based on RFID passive tag detection, wherein the rotor real-time dynamic monitoring system based on RFID passive tag detection comprises: Rotor, strain gauge tag, angle gauge tag, tag holder, reader antenna, tag reader, and high-speed computer; The strain detection tag is set on the rotor circumferential surface to monitor the rotor's dynamic strain and torque; The angle detection tag is set on the rotor circumference to monitor the rotor's torsional angle in the area; The label holder is set on the rotor circumference and the angle detection label is fixed to ensure that the angle detection label is stably arranged along the rotor length direction along the axis. The reader antenna array arrangement Around the rotor, it is used to achieve full-coverage monitoring of the rotor's rotation process; One end of the tag reader is connected to the reader antenna, and the other end is connected to a high-speed computer for transmitting signals; The high-speed computer is used to control the tag reader to start up, transmit signals, and process the backscatter information after each tag is decoded. Then, based on the tag's phase and signal reception strength information, it calculates the measured rotor dynamic strain, torque, torsional angle, and torsional stiffness. The monitoring method is characterized by comprising the following steps: 1) The torque of the rotor is detected using strain gauges to establish the relationship between strain and RSSI value, and the strain is calibrated using RSSI value; 2) By using two strain detection tags arranged on the rotor at 90° to each other and 45° to the rotor axis, the detection results are differentially processed to improve the sensitivity of strain detection and obtain the real-time strain information of the rotor. 3) The rotor torque is obtained through the formulas for strain and torque, with the following relationship: （1） Where M is the rotor torque, G is the shear modulus of the rotor material, and D is the rotor diameter. and These represent strains at angles of 45° and 135° to the axis, respectively. The dynamic torque of the rotor can be calculated from the above formula. Real-time calculation can be achieved by using a high-speed computer to improve the calculation capability of dynamic strain and dynamic torque of the rotor system. 4) Use angle detection tags to detect the rotor's torsional angle, calibrate the initial phase information of the two angle detection tags in the same direction, and determine the initial phase state; 5) Arrange the angle detection tags along the axial direction and detect the phase information of the two angle detection tags before and after the rotor twists; 6) Perform smoothing filtering and difference processing on the phase information of the two angle detection tags. Based on the influence law of the relative position of the angle detection tags on the tag phase difference, establish the correspondence between the phase difference of the angle detection tags and the torsion angle. Use the phase difference to obtain the rotor torsion angle. Use a high-speed computer to improve the calculation capability of the dynamic torsion angle of the rotor system to achieve real-time calculation. 7) Based on the rotor dynamic torque obtained in 3) and the rotor torsional angle obtained in 6), substitute them into the following formula to calculate the rotor's calculated dynamic torsional stiffness: （2） Where φ is the rotor's torsional angle, and M is the rotor's torque. It is the distance from the fixed end to the loading plane; GIp is called torsional stiffness. The dynamic torsional stiffness of the rotor can be calculated using the above formula. Real-time calculation can be achieved by using a high-speed computer to improve the calculation capability of the dynamic torque stiffness of the rotor system.

2. The monitoring method of the rotor real-time dynamic monitoring system based on RFID passive tag detection according to claim 1, characterized in that, There are two strain detection tags, which are set at 90° to each other and at 45° to the rotor axis. The strain detection tags have microstrip antennas.

3. The monitoring method of the rotor real-time dynamic monitoring system based on RFID passive tag detection according to claim 1, characterized in that, The angle detection tag is fixed to the rotor surface by a tag bracket. Two angle detection tags are set on the rotor circumference along the axial direction, and the two angle detection tags are arranged at a certain interval.

4. The monitoring method of the rotor real-time dynamic monitoring system based on RFID passive tag detection according to claim 1, characterized in that, The label holder is designed with an arc shape at the end near the rotor.

5. The monitoring method of the rotor real-time dynamic monitoring system based on RFID passive tag detection according to claim 1, characterized in that, The reader antennas are respectively arranged vertically above, horizontally to the left, vertically below, and horizontally to the right of the rotor system, with the reader antennas facing the direction of the tag, and the distance between the reader antennas and the rotor is set to 0.5m.

6. The monitoring method of the rotor real-time dynamic monitoring system based on RFID passive tag detection according to claim 1, characterized in that, One end of the tag reader is connected to the reader antenna via a feed line, and the other end is connected to a high-speed computer.

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