Fan blade damage on-line monitoring device

Abstract

The invention discloses a fan blade damage on-line monitoring device, and relates to the technical field of wind power, and the device comprises a support assembly which comprises a hollow structure frame body with the position capable of being adjusted; the sensor assembly is elastically connected to the frame body through an elastic connecting assembly, and the elastic connecting assembly is configured to allow the sensor assembly to move in a floating mode relative to the frame body; wherein the sensor assembly comprises an air coupling acoustic emission sensor taking air as a coupling medium, the frame body is configured to adjust the air coupling acoustic emission sensor to a position corresponding to a monitored fan blade through position adjustment, and the air coupling acoustic emission sensor is used for carrying out acoustic detection on the fan blade. The detection reliability is improved, the monitoring cost is reduced, the application range of the acoustic emission technology is expanded, the detection accuracy is effectively improved, the anti-interference capability is high, and the requirements of efficient and accurate detection are met.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to an online monitoring device for wind turbine blade damage. Background Art

[0002] In the field of wind power generation, wind turbine blades are subjected to complex and harsh working environments for a long time, making them extremely prone to problems such as foreign object damage and fatigue failure, requiring monitoring devices. Traditional wind turbine blade monitoring devices usually use coupling media such as coupling agents to achieve contact detection between acoustic emission sensors and the wind turbine blades being tested. Due to aging and drying of the coupling agents, the coupling between the acoustic emission sensor and the wind turbine blades being tested may fail, resulting in poor detection reliability. In addition, the contact detection method has poor anti-interference ability and is easily affected by interference signals such as external vibrations and noise, which in turn mask the blade damage signal, reducing the accuracy and reliability of the detection results. It is difficult to accurately capture the acoustic emission signals generated by wind turbine blade damage, and cannot meet the requirements of actual working conditions for efficient and accurate detection of wind turbine blades. In addition, traditional wind turbine blade monitoring devices usually require each wind turbine blade to be equipped with multiple acoustic emission sensors and a large number of acoustic emission channels, resulting in high monitoring costs and greatly limiting the application of acoustic emission technology. Summary of the Invention

[0003] To address the above technical issues, the present application provides an online monitoring device for wind turbine blade damage, which addresses the technical issues of existing monitoring devices, such as poor detection reliability, poor anti-interference ability, inability to meet the requirements of efficient and accurate detection, and high monitoring costs. The monitoring device of the present application significantly improves detection reliability, significantly reduces monitoring costs, expands the application scope of acoustic emission technology, effectively improves detection accuracy, and has strong anti-interference ability, meeting the requirements of efficient and accurate detection.

[0004] The present application provides an online monitoring device for wind blade damage, which includes: a bracket assembly, which includes a hollow structural frame body that can be adjusted in position; a sensor assembly, which is elastically connected to the frame body through an elastic connection assembly, and the elastic connection assembly is configured to allow the sensor assembly to float relative to the frame body; wherein, the sensor assembly includes an air-coupled acoustic emission sensor with air as a coupling medium, and the frame body is configured to adjust the air-coupled acoustic emission sensor to the corresponding monitored wind blade through position adjustment, and the air-coupled acoustic emission sensor is used to perform acoustic detection on the wind blade.

[0005] In some embodiments, the bracket assembly includes: a base body; a support member vertically connected to the base body; a connecting member, one end of the connecting member is adjustably connected to the support member, and / or the other end of the connecting member is adjustably connected to the frame body.

[0006] In some embodiments, one end of the connector is connected to the support member via a mating ball seat and a connecting ball head; and / or the other end of the connector is connected to the frame body via a mating ball seat and a connecting ball head.

[0007] In some embodiments, the ball head seat includes: a first clamping portion and a second clamping portion, the first clamping portion and the second clamping portion are arranged relative to each other and are configured to be close to or far away from each other; the connecting ball head is clamped between the first clamping portion and the second clamping portion; the bracket assembly also includes a locking member, and the locking member is used to adjust the distance between the first clamping portion and the second clamping portion so that the ball head seat clamps or releases the connecting ball head.

[0008] In some embodiments, the elastic connection assembly includes: a first elastic support cable, which is an annular structure, and connects the axial first end of the frame body and the axial first end of the sensor assembly through multiple points in the circumferential direction; a second elastic support cable, which is an annular structure, and connects the axial second end of the frame body and the axial second end of the sensor assembly through multiple points in the circumferential direction.

[0009] In some embodiments, the sensor assembly also includes: a sensor body, in which the air-coupled acoustic emission sensor is arranged; an elastic clamping member, which elastically clamps the sensor body; an opening and closing control member, connected to the elastic clamping member, for controlling the opening and closing of the elastic clamping member; wherein, the first elastic support cable is staggered to connect the axial first end of the frame body and the axial first end of the elastic clamping member through multiple points in the circumferential direction; the second elastic support cable is staggered to connect the axial second end of the frame body and the axial second end of the elastic clamping member through multiple points in the circumferential direction.

[0010] In some embodiments, the sensor assembly further comprises: a hanging member, fixedly connected to the elastic clamping member and evenly distributed around the axis of the sensor assembly; a first hanging portion is provided at the axial first end of each hanging member, and a second hanging portion is provided at the axial second end of each hanging member; and / or, the bracket assembly further comprises: a hook member, fixedly connected to the frame body and evenly distributed around the axis of the frame body; a first hook portion is provided at the axial first end of each hook member, and a second hook portion is provided at the axial second end of each hook member; wherein, the first elastic support cable is staggered to connect the first hanging portion and the first hook portion through a plurality of circumferential points, and the second elastic support cable is staggered to connect the second hanging portion and the second hook portion through a plurality of circumferential points.

[0011] In some embodiments, the sensor assembly further includes: a flexible gasket clamped between the elastic clamping member and the sensor body.

[0012] In some embodiments, the air-coupled acoustic emission sensor is a MEMS air-coupled acoustic emission sensor.

[0013] In some embodiments, the MEMS air-coupled acoustic emission sensor includes: a sensitive element, which is configured to sense the acoustic emission signal and convert the acoustic emission signal into a physical change signal of capacitance, resistance or voltage; a signal conversion element, which cooperates with the sensitive element and is used to convert the physical change signal into an electrical signal; and a supporting circuit, which is electrically connected to the signal conversion element and is used to amplify, filter and digitize the converted electrical signal.

[0014] In some embodiments, the monitoring device also includes: a host computer, which is electrically connected to the air-coupled acoustic emission sensor through a cable, and is used to control the operation of the air-coupled acoustic emission sensor, receive and process the monitoring signal obtained by the air-coupled acoustic emission sensor, and generate and save the monitoring result data of the monitored wind turbine blades.

[0015] The online monitoring device for wind turbine blade damage provided by the present application adopts air-coupled acoustic emission technology, which does not require complicated coupling operations and avoids coupling failure problems caused by aging and drying of coupling agents, so that the air-coupled acoustic emission sensor can receive the acoustic emission signals generated by wind turbine blade damage more stably and efficiently, significantly improving the reliability of detection. At the same time, the present application greatly reduces the number of acoustic emission sensors and supporting equipment, significantly reduces monitoring costs, and greatly expands the application scope of acoustic emission technology. Moreover, the present application can flexibly adjust the orientation of the air-coupled acoustic emission sensor to better align it with the damage source of the monitored wind turbine blade, effectively improve the accuracy of detection, and meet the requirements of efficient and accurate detection. In addition, the present application elastically connects the sensor assembly to the frame body through an elastic connection assembly, which can effectively buffer the interference of external vibrations, significantly improve the anti-interference ability of the monitoring device, and improve the signal-to-noise ratio of the air-coupled acoustic emission sensor detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of one embodiment of the monitoring device of the present application;

[0018] Figure 2 This is a side view structural diagram of one embodiment of the monitoring device of the present application;

[0019] Figure 3This is a schematic diagram of the exploded structure of the bracket assembly of one embodiment of the monitoring device of the present application;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of a sensor assembly in one embodiment of the monitoring device of the present application;

[0021] Figure 5 This is a schematic diagram of the decomposition structure of the sensor component of one embodiment of the monitoring device of the present application.

[0022] The reference numerals are as follows:

[0023] 10-bracket assembly, 11-base, 111-fixing hole, 12-support member, 120-ball head seat, 1201-first clamping portion, 1202-second clamping portion, 121-fixed support arm, 122-movable support arm, 123-adjustment slot, 13-connecting member, 131-connecting ball head, 132-fixing portion, 1321-clamping arm, 14-frame body, 15-locking member, 16-hook member, 161-first hooking portion, 162-second hooking portion;

[0024] 20 - sensor assembly, 21 - sensor body, 211 - body housing, 212 - base fixing plate, 2121 - signal acquisition hole, 213 - upper cover seal, 2131 - through hole, 214 - air-coupled acoustic emission sensor, 2141 - substrate, 2142 - MEMS chip, 2143 - ASIC chip, 215 - cable, 22 - elastic clamping member, 23 - opening and closing control member, 24 - hanging member, 241 - first hanging part, 242 - second hanging part, 25 - flexible gasket;

[0025] 30-elastic connection assembly, 31-first elastic support cable, 32-second elastic support cable. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the technical solution of the present invention is further described in detail below through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] See also Figure 1 In some embodiments of the present application, an online monitoring device for wind turbine blade damage is provided. The monitoring device includes a bracket assembly 10 and a sensor assembly 20. The bracket assembly 10 is fixed to a bearing surface (not shown in the figure). The bracket assembly 10 includes a hollow structural frame body 14 that can be adjusted in position. The shape of the frame body 14 can be a relatively flat annular structure or a polygonal frame body structure, a relatively cylindrical structure with a certain axial height or a multi-faceted cylindrical structure, or a hollow structural frame body of other shapes, which is not limited in this application.

[0028] The sensor assembly 20 is elastically connected to the frame body 14 via an elastic connection assembly 30. The elastic connection assembly 30 is configured to allow the sensor assembly 20 to float and reposition relative to the frame body 14. Floating movement means that the sensor assembly 20 can perform axial reciprocating movement along the axis of the frame body 14, can also swing at a certain angle relative to the axis of the frame body 14 within the frame range of the frame body 14, or can simultaneously perform axial reciprocating movement and swing at a certain angle relative to the frame body 14.

[0029] The sensor assembly 20 includes an air-coupled acoustic emission sensor 214 (e.g., Figure 5 ), the frame body 14 is configured to adjust the position of the air-coupled acoustic emission sensor 214 to the corresponding monitored wind turbine blade, so that the air-coupled acoustic emission sensor 214 can accurately correspond to the damage source of the wind turbine blade, and then accurately acoustically detect the monitored wind turbine blade through the air-coupled acoustic emission sensor 214. During the monitoring process, the elastic connection component 30 can use its own elastic force to offset the adverse effects of external vibrations on the air-coupled acoustic emission sensor 214, maintain the stable monitoring state of the sensor component 20, and ensure that the air-coupled acoustic emission sensor 214 accurately detects the damage source of the wind turbine blade.

[0030] The online monitoring device for fan blade damage provided in the present application adopts air-coupled acoustic emission technology. The air-coupled acoustic emission sensor 214 uses air as a coupling medium to realize non-contact acoustic detection of fan blades. Unlike traditional acoustic emission sensors that require the help of a tight coupling medium (such as a coupling agent, etc.) to connect with the surface of the object to be measured, the air-coupled acoustic emission sensor 214 of the monitoring device of the present application does not require complicated coupling operations, avoiding the coupling failure problem caused by aging and drying of the coupling agent, etc., and can receive the acoustic emission signal generated by the fan blade damage more stably and efficiently, significantly improving the reliability of detection.

[0031] At the same time, the online wind blade damage monitoring device provided by this application has significant cost advantages. Each wind blade only needs to be equipped with one sensor assembly 20, corresponding to only three acoustic emission channels. Compared with traditional acoustic emission monitoring solutions, the online wind blade damage monitoring device provided by this application significantly reduces the number of acoustic emission sensors and supporting equipment, significantly reducing the hardware cost, installation cost, and subsequent maintenance cost of the monitoring device. This significantly reduces the cost of acoustic emission technology in wind blade damage monitoring and other application scenarios, making it more economically feasible and greatly expanding the application range of acoustic emission technology.

[0032] Moreover, the online monitoring device for wind blade damage provided in the present application can adjust the position of the frame body 14 so that the air-coupled acoustic emission sensor 214 can flexibly adjust its direction, better align with the damage source of the monitored wind blade, accurately receive the acoustic emission signal, effectively improve the accuracy of detection, and meet the requirements of efficient and accurate detection.

[0033] In addition, the online monitoring device for wind blade damage provided in the present application elastically connects the sensor assembly 20 to the frame body 14 through an elastic connection assembly 30, so that the sensor assembly 20 can float relative to the frame body 14 and can automatically reset under the action of elastic force. The sensor assembly 20, the elastic connection assembly 30 and the frame body 14 constitute a stable support structure system, which can effectively buffer the interference of external vibrations, significantly improve the anti-interference ability of the monitoring device, and improve the signal-to-noise ratio of the detection of the air-coupled acoustic emission sensor 214.

[0034] See also Figures 1 to 2 In some embodiments, the bracket assembly 10 includes a base 11, a support member 12, and a connector 13. The base 11 can be set as a flat plate structure or a block structure. The bottom surface of the base 11 is set to fit the bearing surface so that the base 11 can be stably fixed to the bearing surface. The base 11 in this embodiment is described as a flat plate structure. Fixing holes 111 are provided at the four corners of the base 11. The support member 12 is vertically connected to the base 11. When the bearing surface is a horizontal plane, the support member 12 can be a vertically extended setting. The support member 12 can be set as a cylindrical structure, a polygonal columnar structure or other columnar structure. This application does not limit this. It can stably support the connector 13, the frame body 14, the sensor assembly 20 and other related components to ensure the long-term stable operation of the monitoring device.

[0035] The connecting member 13 can be set as a rod-shaped structure. During implementation, one end of the connecting member 13 (i.e., the end facing the seat body 11, which will not be described in detail below) can be set to be connected to the support member 12 in an angle-adjustable manner, and the other end of the connecting member 13 (i.e., the end facing the sensor assembly 20, which will not be described in detail below) can be set to be connected to the frame body 14 in an angle-adjustable manner. In this way, both ends of the connecting member 13 can be adjusted to any angle compared to the seat body 11 or the frame body 14, thereby realizing multi-directional adjustment of the frame body 14 in the entire three-dimensional space, and being able to flexibly adjust the air-coupled acoustic emission sensor 214 on the sensor assembly 20 to the appropriate position corresponding to the monitored wind turbine blade.

[0036] In some other embodiments, one end of the connecting member 13 can also be set to be connected to the support member 12 at a fixed angle, and the other end of the connecting member 13 can be set to be connected to the frame body 14 with an adjustable angle. As long as the fixed angle between the connecting member 13 and the support member 12 is set reasonably and the length of the connecting member 13 is set appropriately, the air-coupled acoustic emission sensor 214 on the sensor assembly 20 can be adjusted to the appropriate position corresponding to the monitored wind turbine blade by adjusting the angle of the frame body 14 relative to the connecting member 13.

[0037] In some other embodiments, one end of the connecting member 13 can be set to be connected to the support member 12 with an adjustable angle, and the other end of the connecting member 13 can be set to be connected to the support member 12 at a fixed angle. When in use, the air-coupled acoustic emission sensor 214 on the sensor assembly 20 can be adjusted to a suitable position corresponding to the monitored wind turbine blade by adjusting the connecting member 13 at multiple angles relative to the support member 12.

[0038] During actual manufacturing, the connecting piece 13 can be set to achieve multi-angle adjustment at one end, or it can be set to achieve multi-angle adjustment at both ends at the same time. This application does not make any restrictions, and it only needs to meet the precise positioning adjustment of the air-coupled acoustic emission sensor 214.

[0039] The bearing surface refers to a plane that can bear the monitoring device of this application. The bearing surface can be the root plane of the fan blade, or the plane of the manhole cover or its vicinity. This application does not limit this. During actual installation, the base 11 of the bracket assembly 10 can be adhered to the root of the fan blade using high-performance adhesive material to achieve lossless installation of the monitoring device on the fan blade; or after punching a hole in the manhole cover, the base 11 of the bracket assembly 10 can be fixed to the manhole cover through the fixing holes 111 and bolts, ensuring the reliability of the connection between the monitoring device and the bearing surface without damaging the main structure of the fan blade, thereby ensuring the safety and integrity of the blade and providing reliable protection for the stable installation of the entire monitoring device.

[0040] See also Figures 1 to 3 In some embodiments, one end of the connecting member 13 and the supporting member 12 are connected by a ball head seat 120 and a connecting ball head 131 (such as Figure 3) connection. The matching structure of the ball head seat 120 and the connecting ball head 131 can realize the "universal" angle adjustment of the connecting member 13 compared with the seat body 11, so that the connecting member 13 can be adjusted at multiple angles compared with the axial direction of the support member 12 and the extension angle of the connecting member 13 can be changed. It also enables the connecting member 13 to rotate around its own axis compared with the support member 12, change the axis direction of the frame body 14, and realize the multi-directional and multi-angle position adjustment of the frame body 14 in three-dimensional space. In this way, the connecting member 13 only needs to be connected to the support member 12 at one end in an angle-adjustable manner, so that the air-coupled acoustic emission sensor 214 can be flexibly adjusted to the appropriate position corresponding to the monitored wind turbine blade.

[0041] like Figures 1 to 3 As shown in , in some embodiments, the ball head seat 120 can be set on the support member 12, and the corresponding connecting ball head 131 is set at one end of the connecting member 13. In some other embodiments, the ball head seat can also be set at one end of the connecting member, and the corresponding connecting ball head is set on the support member.

[0042] In some other embodiments, one end of the connector can be configured to be connected to the support member through a ball seat and a connecting ball head that cooperate with each other, and the other end of the connector can be configured to be connected to the frame body through a ball seat and a connecting ball head that cooperate with each other. That is, both ends of the connector are connected to the support member or the frame body through the matching structure of the ball seat and the connecting ball head. Compared with the method in which only one end of the connector is connected to the support member through the ball seat and the connecting ball head, this method can achieve multi-angle adjustment of the frame body compared to the connector, has higher flexibility, and can adjust the air-coupled acoustic emission sensor to the appropriate position corresponding to the monitored wind turbine blade more quickly and accurately.

[0043] See also Figure 3 In some embodiments, the ball head seat 120 includes a first clamping portion 1201 and a second clamping portion 1202. The first clamping portion 1201 and the second clamping portion 1202 are arranged opposite each other and can be configured to move closer to or farther away from each other. The first clamping portion 1201 and the second clamping portion 1202 can be configured as opposing, approximately hemispherical shell-like structures, with the connecting ball head 131 clamped between the first clamping portion 1201 and the second clamping portion 1202.

[0044] When the distance between the circumferential end faces relative to each other of the first clamping portion 1201 and the second clamping portion 1202 is greater than the outer diameter of the connecting ball head 131, the connecting ball head 131 is allowed to be inserted into or extracted from the gap between the first clamping portion 1201 and the second clamping portion 1202, thereby realizing the assembly or separation of the connecting ball head 131 and the ball head seat 120; when the distance between the inner top faces relative to each other of the first clamping portion 1201 and the second clamping portion 1202 is adjusted to be less than or equal to the outer diameter of the connecting ball head 131, the ball head seat 120 can clamp and fix the connecting ball head 131 through the first clamping portion 1201 and the second clamping portion 1202, thereby limiting the angle of the connecting member 13 relative to the support member 12.

[0045] The bracket assembly 10 also includes a locking member 15, which is used to adjust the distance between the first clamping part 1201 and the second clamping part 1202 so that the ball head seat 120 can clamp or loosen the connecting ball head 131. It has a simple structure and is easy to use. While reducing costs, it can realize rapid alignment adjustment of the air-coupled acoustic emission sensor 214, thereby improving the efficiency of position adjustment of the air-coupled acoustic emission sensor 214 in the early stage of detection.

[0046] See also Figure 3 In some embodiments, the support member 12 is provided with a fixed arm 121 and a movable arm 122 arranged opposite to the fixed arm 121. The fixed arm 121 is integrally connected to the main part of the support member 12, and the movable arm 122 is slidably connected to the main part of the support member 12 and can be relatively close to or away from the fixed arm 121.

[0047] The ball head seat 120 is set on the support member 12, and the connecting ball head 131 is set at one end of the connecting member 13. Among them, the first clamping part 1201 is set on the fixed support arm 121, and the second clamping part 1202 is set on the movable support arm 122. The locking member 15 is threadedly connected to the fixed support arm 121 and the movable support arm 122. An adjustment groove 123 (such as Figure 1 As shown in ), the connecting member 13 is restricted by the adjustment slot 123 and can be adjusted in angle on the plane of the adjustment slot 123. The connecting member 13 can also be rotated around its own axis to adjust the axis deflection angle of the frame body 14.

[0048] During installation, the adjustment slot 123 can be made to correspond to the monitored wind turbine blade, so that the axial angle of the connecting member 13 relative to the support member 12 can be adjusted, so that the sensor assembly 20 movably connected on the frame body 14 is moved closer to or away from the monitored wind turbine blade, and the height of the air-coupled acoustic emission sensor 214 relative to the monitored wind turbine blade can be adjusted; at the same time, the orientation of the air-coupled acoustic emission sensor 214 on the sensor assembly 20 can be adjusted by driving the connecting member 13 to rotate around its own axis, so that the air-coupled acoustic emission sensor 214 can accurately correspond to the damage source of the monitored wind turbine blade.

[0049] During adjustment, the locking member 15 can be loosened, causing the movable arm 122 to drive the second clamping portion 1202 relatively away from the fixed arm 121 and the first clamping portion 1201, thereby causing the ball head seat 120 to loosen the connecting ball head 131, making it easier for the operator to adjust the connecting member 13 along the adjustment slot 123 to a suitable angle and rotate the connecting member 13 around its own axis to a suitable angle, thereby adjusting the air-coupled acoustic emission sensor 214 on the frame body 14 to accurately correspond to the damage source of the monitored wind turbine blade. The locking member 15 is then tightened, causing the movable arm 122 to drive the second clamping portion 1202 relatively close to the fixed arm 121 and the first clamping portion 1201, thereby causing the ball head seat 120 to clamp and fix the connecting ball head 131, completing the angle adjustment of the connecting member 13.

[0050] See also Figures 2 to 3 In some embodiments, the frame body 14 can be configured as a relatively flat annular structure, and the connector 13 can be configured as a cylindrical structure. One end of the connector 13 is connected to the ball head seat 120 on the support member 12 via a connecting ball head 131 so as to be adjustable in angle; the other end of the connector 13 is fixedly connected to the frame body 14 via a fixing portion 132. The axis of the connector 13 is perpendicular to the axis of the frame body 14, that is, the connector 13 is radially connected to the frame body 14. In this way, when the connector 13 rotates around its own axis, the direction of the axis of the frame body 14 can be precisely controlled, thereby precisely adjusting the direction of the air-coupled acoustic emission sensor 214 on the frame body 14.

[0051] One end of the fixing portion 132 is vertically connected to the connecting member 13, and the other end of the fixing portion 132 is provided with two clamping arms 1321 (such as Figure 3 ), the side of the frame body 14 is at least partially fixedly connected between the two clamping arms 1321.

[0052] See also Figures 1 to 2In some embodiments, the elastic connection assembly 30 includes a first elastic support cable 31 and a second elastic support cable 32. The first elastic support cable 31 is an annular structure with corresponding elasticity. The first elastic support cable 31 interlacedly connects the axial first end of the frame body 14 and the axial first end of the sensor assembly 20 at multiple points along the circumference. The second elastic support cable 32 is an annular structure with corresponding elasticity. The second elastic support cable 32 interlacedly connects the axial second end of the frame body 14 and the axial second end of the sensor assembly 20 at multiple points along the circumference.

[0053] At least one first elastic support cable 31 and one second elastic support cable 32 are provided. The first elastic support cable 31 and the second elastic support cable 32 can be identical, having the same circumferential length and elasticity. When the frame body 14 is positioned horizontally, the axis of the frame body 14 is vertical. In this state, the first axial end of the frame body 14 and the first axial end of the sensor assembly 20 are both represented by the upper end, while the second axial end of the frame body 14 and the second axial end of the sensor assembly 20 are both represented by the lower end.

[0054] After the sensor assembly 20 is elastically connected to the frame body 14 via the first and second elastic support cables 31, 32, the upper and lower sets of elastic support cables automatically adjust the sensor assembly 20 to be coaxial with the frame body 14 when a force equilibrium is reached, facilitating intuitive confirmation of the orientation of the air-coupled acoustic emission sensor 214. Furthermore, the elastic connection of the sensor assembly 20 to the frame body 14 via the upper and lower sets of elastic support cables further enhances the stability and anti-interference capabilities of the sensor assembly 20.

[0055] See also Figures 4 and 5 In some embodiments, the sensor assembly 20 further includes a sensor body 21, an elastic clamping member 22, and an opening and closing control member 23. An air-coupled acoustic emission sensor 214 is provided inside the sensor body 21, which serves as a physical protective barrier for the internal components of the sensor, accommodates and protects the air-coupled acoustic emission sensor 214, prevents dust, water vapor and other external impurities from entering the air-coupled acoustic emission sensor 214, and protects the internal components of the sensor. Accordingly, the sensor body 21 is provided with a signal collection hole 2121 (such as a hole 2121) on the bottom end surface of the wind turbine blade to be monitored for the acoustic emission signal to enter. Figure 5 As shown in , the signal collection hole 2121 is aligned with the sensing portion of the air-coupled acoustic emission sensor 214 so that the incoming acoustic emission signal can be directly collected by the air-coupled acoustic emission sensor 214.

[0056] See also Figures 4 and 5The elastic clamping member 22 is an elastic clamping member and can be configured as a pipe clamp structure with an opening on one side. The elastic clamping member 22 is configured to elastically clamp the sensor body 21. The opening and closing control member 23 is connected to the elastic clamping member 22 and is used to control the opening and closing of the elastic clamping member 22.

[0057] Among them, the first elastic support rope 31 is staggered to connect the axial first end of the frame body 14 and the axial first end of the elastic clamping member 22 through multiple points in the circumferential direction; the second elastic support rope 32 is staggered to connect the axial second end of the frame body 14 and the axial second end of the elastic clamping member 22 through multiple points in the circumferential direction.

[0058] The monitoring device of the present application clamps the sensor body 21 through the elastic clamping part 22, ensuring the stability of the working position of the air-coupled acoustic emission sensor 214, and can control the opening and closing of the elastic clamping part 22 by operating the opening and closing control part 23, thereby realizing the rapid disassembly and assembly of the sensor body 21 on the frame body 14, so there is no need to disassemble and install the elastic support rope and the elastic clamping part 22, which greatly improves the convenience of disassembly and assembly of the sensor body 21 and improves the efficiency of the layout of the monitoring device.

[0059] In this embodiment, the opening and closing control member 23 and the elastic clamping member 22 are configured to have a structure similar to a dovetail clamp. The elastic clamping member 22 can be formed by winding a steel plate into a tube-clamp-like structure with one side open. The opening and closing control members 23 are arranged in pairs and can be respectively wound with steel wire into a tail handle of a certain length. One end of the tail handle is connected to the open side of the elastic clamping member 22 of the tube-clamp-like structure, and the other end of the tail handle can be flipped to the side away from the open side of the elastic clamping member 22. When the sensor body 21 needs to be installed, the operator only needs to pinch the two tail handles to control the opening of the elastic clamping member 22 of the tube-clamp-like structure and place the sensor body 21 in the designated position in the elastic clamping member 22. After releasing the two tail handles, the elastic clamping member 22 of the tube-clamp-like structure automatically clamps the sensor body 21 under the action of its own elastic force. The upper and lower sets of elastic support cables further stabilize the position of the sensor body 21. Similarly, when disassembling the sensor body 21, the operator only needs to pinch the two tail handles with his hands to control the elastic clamping parts 22 of the tube clamp structure to open, thereby taking out the sensor body 21. The operation is simple and convenient, which greatly facilitates the installation, maintenance and replacement of the sensor body 21.

[0060] See also Figure 2 、 Figures 4 and 5In some embodiments, the sensor assembly 20 further includes a plurality of hanging members 24, which are fixedly connected to the elastic clamping member 22 and are evenly distributed around the axis of the sensor assembly 20. A first hanging portion 241 is provided at a first axial end (the upper end is used as an example), and a second hanging portion 242 is provided at a second axial end (the lower end is used as an example).

[0061] See also Figures 2 to 3 Correspondingly, the bracket assembly 10 further includes a plurality of hooking members 16, which are fixedly connected to the frame body 14 and are evenly distributed around the axis of the frame body 14. A first hooking portion 161 is provided at a first axial end (the upper end is used as an example), and a second hooking portion 162 is provided at a second axial end (the lower end is used as an example).

[0062] The hooking members 24 are arranged at intervals on the inner side of the hooking member 16. The first hooking portion 241 and the first hooking portion 161 are staggered at equal intervals in the axial direction, and the second hooking portion 242 and the second hooking portion 162 are staggered at equal intervals in the axial direction. The first elastic support cable 31 interlacedly connects the first hooking portion 241 and the first hooking portion 161 at multiple points along the circumference, and the second elastic support cable 32 interlacedly connects the second hooking portion 242 and the second hooking portion 162 at multiple points along the circumference.

[0063] The monitoring device of the present application connects the first elastic support cable 31 via the first hanging portion 241 on the hanging member 24 and the first hook portion 161 on the hook member 16, and connects the second elastic support cable 32 via the second hanging portion 242 on the hanging member 24 and the second hook portion 162 on the hook member 16, so as to elastically connect the sensor assembly 20 to the frame body 14, and enable the sensor assembly 20 to be coaxial with the frame body 14 when in a force-balanced state. When external vibration occurs, the sensor assembly 20 can float relative to the frame body 14 under the elastic pull of the upper and lower sets of elastic support cables to maintain the initial monitoring position of the air-coupled acoustic emission sensor 214, thereby minimizing the impact of external vibration on the detection results and ensuring the reliability of the detection.

[0064] In actual manufacturing, the hanging member 24 can be made of a long steel plate, and its upper and lower ends can be bent to form the oppositely arranged first hanging portion 241 and second hanging portion 242. The hanging member 24 can be vertically welded to the outer wall of the elastic clamping member 22, with all the first hanging portions 241 flush with the upper end of the sensor assembly 20, and all the second hanging portions 242 flush with the lower end of the sensor assembly 20.

[0065] The hook member 16 can also be made of a long steel plate, and its upper and lower ends can be formed by bending to form a first hook portion 161 and a second hook portion 162 arranged opposite to each other. The length of the hook member 16 can be set to be greater than the axial height of the frame body 14. The hook member 16 can be vertically welded and fixed to the inner wall of the frame body 14, and all the first hook portions 161 extending outward from the upper end of the frame body 14 have the same length, all the second hook portions 162 extending outward from the lower end of the frame body 14 have the same length, and the first hook portions 161 and the second hook portions 162 have the same vertical spacing from the frame body 14.

[0066] That is, all the hanging members 24 are identical in structure and size, and are fixedly connected to the elastic clamping member 22 at the same height. All the hooking members 16 are identical in structure and size, and are fixedly connected to the frame body 14 at the same height. In this way, when the sensor assembly 20 is connected to the frame body 14 via the upper and lower sets of elastic support cables, the sensor assembly 20 achieves greater stability when in a force-balanced state, ensuring that the axis of the sensor assembly 20 coincides with the axis of the frame body 14.

[0067] See also Figure 1 、 Figures 4 and 5 In some embodiments, the sensor assembly 20 further includes a flexible gasket 25. The flexible gasket 25 is a flexible structure with certain elastic deformation and recovery capabilities. The flexible gasket 25 is clamped between the elastic clamping member 22 and the sensor body 21. On the one hand, it can play a shock-absorbing role, further reducing the impact of external vibrations on the sensor assembly 20. On the other hand, the flexible gasket 25 can also increase the friction between the elastic clamping member 22 and the sensor body 21, thereby improving the reliability and stability of the elastic clamping member 22 in fixing the sensor body 21, and preventing the sensor body 21 from being displaced relative to the elastic clamping member 22 during use.

[0068] The flexible gasket 25 can be made of flexible materials such as rubber, silicone, foam, etc., and can be fixedly bonded to the inner wall surface of the elastic clamping member 22 .

[0069] See also Figure 5In some embodiments, the air-coupled acoustic emission sensor 214 is a MEMS air-coupled acoustic emission sensor. MEMS is the abbreviation of Micro-Electro-Mechanical System, and its Chinese name is micro-electromechanical system. It is an industrial technology that integrates microelectronic circuit technology and micromechanical system. Its operating range is usually within the micron scale. The MEMS air-coupled acoustic emission sensor is an acoustic emission sensor with a microstructure manufactured using MEMS technology. The structure of the MEMS air-coupled acoustic emission sensor mainly includes a substrate 2141, a MEMS chip 2142 integrated on the substrate 2141 (used to sense signals, which is equivalent to a sensitive element), and an ASIC chip 2143 (used to process signals, which is a conversion and transformation element). The MEMS chip 2142 is responsible for sensing signals and converting the measured quantities into changes in resistance, capacitance and other signals; the ASIC chip 2143 is responsible for converting signals such as capacitance and resistance into electrical signals, which involves functions such as signal conversion and amplification.

[0070] The MEMS air-coupled acoustic emission sensor is the core detection component of the monitoring device of this application. Its frequency range is 1Khz-30Khz, taking into account both low-frequency and high-frequency signals. It has a wide frequency response range and can effectively detect various acoustic emission signals from low frequency to high frequency. It is suitable for detection of various types of acoustic emission sources.

[0071] Due to the use of micro-electromechanical processing technology, the size and structure of the sensitive elements in the MEMS air-coupled acoustic emission sensor can be precisely controlled, making it more sensitive to weak acoustic emission signals. It can detect tiny signal changes that are difficult to detect with traditional acoustic emission sensors, and can sensitively capture the acoustic emission signals generated by wind turbine blade damage, and perform high-sensitivity blade damage monitoring, which significantly improves the detection sensitivity and detection accuracy of the monitoring device of this application, and realizes the extended monitoring of minor damage to wind turbine blades and early warning of major damage.

[0072] At the same time, the application of MEMS technology makes the MEMS air-coupled acoustic emission sensor smaller in size and lighter in weight, which is convenient for installation and integration into various complex systems. It is especially suitable for occasions with high space requirements. The monitoring device of this application pioneered the application of MEMS air-coupled acoustic emission sensors in the field of online monitoring of wind turbine blade damage. The integration, detection accuracy, response range, etc. of the sensor component 20 are higher than those of traditional acoustic emission sensors, and the overall size and space occupancy of the sensor component 20 are significantly reduced.

[0073] Moreover, the application of MEMS technology also makes MEMS air-coupled acoustic emission sensors have lower power consumption. Compared with traditional acoustic emission sensors, MEMS air-coupled acoustic emission sensors have relatively lower power consumption performance, which is very important for monitoring systems that need to run for a long time or rely on battery power. It effectively extends the service life of the monitoring device and reduces maintenance costs.

[0074] In addition, the MEMS air-coupled acoustic emission sensor uses air as the coupling medium, eliminating the need for traditional coupling agents (such as vaseline, butter, etc.), avoiding the contamination of the fan blade surface by the coupling agent, and eliminating the need for complex pretreatment of the fan blade surface. Installation and use are more convenient and quick, and are especially suitable for online monitoring of fan blades with high temperature, high-speed rotation or rough surfaces.

[0075] Traditional acoustic emission sensors have limitations in terms of detection sensitivity, frequency response range, size, and power consumption, making it difficult to achieve both high sensitivity and broadband response. Furthermore, their large size and high power consumption restrict their application in online monitoring of wind blade damage. This application pioneers the application of MEMS air-coupled acoustic emission sensors in the field of online monitoring of wind blade damage, offering advantages such as high sensitivity, broadband response, miniaturization, integration, and low power consumption. Their performance in online monitoring of wind blade damage is particularly outstanding, with significant results in detecting small blade defects and analyzing high-frequency signals.

[0076] In some embodiments, the MEMS air-coupled acoustic emission sensor includes a sensitive element, a signal conversion element, and a supporting circuit. The sensitive element is configured to sense the acoustic emission signal and convert the acoustic emission signal into a physical change signal of capacitance, resistance, or voltage; the signal conversion element cooperates with the sensitive element to convert the physical change signal into an electrical signal; the supporting circuit is electrically connected to the signal conversion element to amplify, filter, and digitize the converted electrical signal.

[0077] The operating principle of the MEMS air-coupled acoustic emission sensor is common knowledge in the field and is not further explained or illustrated in this application. The MEMS air-coupled acoustic emission sensor can be a commercially available model or independently developed and designed for the online monitoring of wind turbine blade damage, which is not limited in this application.

[0078] In some embodiments, the monitoring device further includes a host computer (not shown in the figure), which is connected to the host computer via a cable 215 (such as Figure 5 As shown in the figure, it is electrically connected to the MEMS air-coupled acoustic emission sensor, and the upper computer is used to control the operation of the MEMS air-coupled acoustic emission sensor, receive and process the monitoring signal obtained by the MEMS air-coupled acoustic emission sensor, and generate and save the monitoring result data of the monitored wind turbine blades.

[0079] The host computer, which can be a terminal device such as a computer or industrial computer, can be configured to display real-time test results on a screen. When abnormal data is detected, a special display can be displayed on the screen or an abnormality alarm can be sent to the operator, allowing the operator to promptly identify the abnormality and intervene to prevent accidents.

[0080] See also Figure 5 In some embodiments, the sensor body 21 further includes a main body shell 211, a base fixing plate 212, and an upper cover seal 213. The main body shell 211 is a hollow cylindrical structure for providing space for accommodating the MEMS air-coupled acoustic emission sensor. The base fixing plate 212 is fixedly connected to the bottom opening of the main body shell 211 and closes it. The signal collection hole 2121 is set through the base fixing plate 212. The MEMS air-coupled acoustic emission sensor is fixed on the base fixing plate 212, and the sensitive element of the MEMS air-coupled acoustic emission sensor corresponds to the signal collection hole 2121. The upper cover seal 213 is fixedly connected to the top opening of the main body shell 211 and closes it. The upper cover seal 213 is provided with a through hole 2131 for the cable 215 to pass through. One end of the cable 215 is electrically connected to the upper computer, and the other end extends into the sensor body 21 through the through hole 2131 and is electrically connected to the MEMS air-coupled acoustic emission sensor.

[0081] The sensor body 21 of the monitoring device of the present application has a simple structure and is easy to assemble and disassemble. A physical protection barrier is formed for the internal MEMS air-coupled acoustic emission sensor through the main body shell 211, which accommodates and protects the sensitive elements, signal conversion elements, supporting circuits and other internal components of the MEMS air-coupled acoustic emission sensor; the upper end opening of the main body shell 211 is sealed by the upper cover seal 213 to prevent external impurities such as dust and water vapor from entering the interior of the sensor body, thereby protecting the internal components of the MEMS air-coupled acoustic emission sensor; the sensitive elements, signal conversion elements, supporting circuits and other internal components of the MEMS acoustic emission sensor are fixed by the base fixing plate 212 to ensure that the position of the MEMS acoustic emission sensor in the sensor body is stable.

[0082] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An online monitoring device for fan blade damage, characterized in that: include: A support assembly (10) includes a position-adjustable hollow structural frame (14); A sensor assembly (20) is elastically connected to the frame body (14) via an elastic connection assembly (30), wherein the elastic connection assembly (30) is configured to allow the sensor assembly (20) to move in a floating manner relative to the frame body (14); The sensor assembly (20) includes an air-coupled acoustic emission sensor (214) using air as a coupling medium, and the frame body (14) is configured to adjust the air-coupled acoustic emission sensor (214) to the corresponding monitored wind turbine blade through position adjustment, and the air-coupled acoustic emission sensor (214) is used to perform acoustic detection on the wind turbine blade.

2. The online monitoring device for wind turbine blade damage according to claim 1, characterized in that: The bracket assembly (10) comprises: base(11); A support member (12) vertically connected to the base (11); A connecting member (13), one end of the connecting member (13) is connected to the supporting member (12) in an angle-adjustable manner, and / or the other end of the connecting member (13) is connected to the frame body (14) in an angle-adjustable manner.

3. The online monitoring device for wind turbine blade damage according to claim 2, characterized in that: One end of the connecting member (13) is connected to the supporting member (12) via a ball head seat (120) and a connecting ball head (131) that cooperate with each other; And / or, the other end of the connecting member (13) is connected to the frame body (14) via a ball head seat (120) and a connecting ball head (131) that cooperate with each other.

4. The online monitoring device for wind turbine blade damage according to claim 3 is characterized in that: The ball head seat (120) includes: A first clamping portion (1201) and a second clamping portion (1202), wherein the first clamping portion (1201) and the second clamping portion (1202) are arranged relative to each other and are configured to be able to move closer to or farther away from each other; the connecting ball head (131) is clamped between the first clamping portion (1201) and the second clamping portion (1202); The bracket assembly (10) further includes a locking member (15), wherein the locking member (15) is used to adjust the distance between the first clamping portion (1201) and the second clamping portion (1202) so as to enable the ball head seat (120) to clamp or release the connecting ball head (131).

5. The online monitoring device for wind turbine blade damage according to claim 1, characterized in that: The elastic connection assembly (30) comprises: A first elastic support cable (31) is an annular structure, staggeredly connecting the axial first end of the frame body (14) and the axial first end of the sensor assembly (20) through a plurality of points in the circumferential direction; The second elastic support cable (32) is an annular structure, and is staggered to connect the second axial end of the frame body (14) and the second axial end of the sensor assembly (20) through a plurality of points in the circumferential direction.

6. The online monitoring device for wind turbine blade damage according to claim 5, characterized in that: The sensor assembly (20) further comprises: A sensor body (21) having the air-coupled acoustic emission sensor (214) disposed therein; an elastic clamping member (22) for elastically clamping the sensor body (21); an opening and closing control member (23), connected to the elastic clamping member (22), and used for controlling the opening and closing of the elastic clamping member (22); The first elastic support cable (31) is connected to the first axial end of the frame body (14) and the first axial end of the elastic clamping member (22) by staggering at multiple points in the circumferential direction; the second elastic support cable (32) is connected to the second axial end of the frame body (14) and the second axial end of the elastic clamping member (22) by staggering at multiple points in the circumferential direction.

7. The online monitoring device for wind turbine blade damage according to claim 6, characterized in that: The sensor assembly (20) further comprises: Hanging members (24) are fixedly connected to the elastic clamping member (22) and are evenly distributed around the axis of the sensor assembly (20); a first hanging portion (241) is provided at a first axial end of each hanging member (24), and a second hanging portion (242) is provided at a second axial end of each hanging member (24); And / or, the support assembly (10) further includes: Hooking members (16) are fixedly connected to the frame body (14) and are evenly distributed around the axis of the frame body (14); a first hooking portion (161) is provided at the first axial end of each hooking member (16), and a second hooking portion (162) is provided at the second axial end of each hooking member (16); The first elastic support cable (31) is connected to the first hanging portion (241) and the first hook portion (161) by staggered connection at multiple points in the circumferential direction, and the second elastic support cable (32) is connected to the second hanging portion (242) and the second hook portion (162) by staggered connection at multiple points in the circumferential direction.

8. The online monitoring device for wind turbine blade damage according to claim 6, characterized in that: The sensor assembly (20) further comprises: A flexible gasket (25) is clamped between the elastic clamping member (22) and the sensor body (21).

9. The online monitoring device for wind turbine blade damage according to claim 1, characterized in that: The air-coupled acoustic emission sensor (214) is a MEMS air-coupled acoustic emission sensor.

10. The online monitoring device for wind turbine blade damage according to claim 9, characterized in that: The MEMS air-coupled acoustic emission sensor comprises: A sensitive element configured to sense an acoustic emission signal and convert the acoustic emission signal into a physical change signal of capacitance, resistance or voltage; a signal conversion element, cooperating with the sensitive element, for converting the physical change signal into an electrical signal; The supporting circuit is electrically connected to the signal conversion element and is used to amplify, filter and digitize the electrical signal obtained by the conversion.

11. The wind turbine blade damage online monitoring device according to any one of claims 1 to 10, characterized in that: Also includes: The host computer is electrically connected to the air-coupled acoustic emission sensor (214) via a cable (215), and is used to control the operation of the air-coupled acoustic emission sensor (214), receive and process the monitoring signal obtained by the air-coupled acoustic emission sensor (214), and generate and save the monitoring result data of the monitored wind turbine blades.

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