Sound acquisition system for fan blade monitoring

Abstract

The utility model relates to the technical field of blade state monitoring of wind generating sets, in particular to a sound acquisition system for monitoring fan blades, which comprises a sound acquisition sensor, a front-end sound processor and a rear-end sound processor. The sound acquisition sensors are arranged at the wind generating set and are used for acquiring audio information of fan blades during operation and feeding back the audio information to the front-end sound processor; the front-end sound processor is arranged at the wind generating set, interacts information with the rear-end sound processor, and is used for receiving the audio information transmitted by the sound acquisition sensor, intercepting the acquired audio information at a set frequency and transmitting the audio information to the rear-end sound processor; and the rear-end sound processor is arranged at a central control room of the wind power plant and is used for carrying out noise reduction and comparative analysis on the received audio information and outputting a result. Based on the voiceprint feature analysis monitoring technology, the device is simple in structure and easy to implement, and the stable and accurate monitoring of the running state of the fan blade is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind generating set blade state monitoring technical field, specifically is a sound collection system for fan blade monitoring. BACKGROUND

[0002] In the structure of wind generating set, fan blade is one of key components, and its state directly influences the performance and power generation efficiency of the whole unit. Based on the special existence of fan blade as high altitude rotor structure in the whole machine structure, according to the statistics in the industry, the failure rate of fan blade accounts for more than 20% in the whole machine, and the maintenance cost is more than 30% of the cost of the whole machine, which is especially prominent in the working condition environment of single machine capacity growing and fan blade length breaking through the hundred meters. Therefore, effectively monitoring the running state of fan blade is a major technical key to guarantee the stable and safe service of wind generating set.

[0003] For the running state monitoring of fan blade, the traditional technical means is to realize the detection by using contact type sensors such as vibration sensor and strain gauge, however, due to the arrangement density of contact type sensors on fan blade and the disadvantageous influence that these detection elements are easily affected by electromagnetic interference, the comprehensiveness and accuracy of fan blade monitoring are insufficient, the monitoring result error is large, and it is difficult to accurately reflect the real-time running state of fan blade.

[0004] Therefore, in recent years, various fan blade running state monitoring technologies based on voiceprint feature analysis have been researched in the industry, such as the technical solutions disclosed in the patent documents with the title of "A wind turbine blade sound intelligent acquisition monitoring device", the publication number of CN221610110U, the publication date of August 27, 2024, the title of "A wind turbine blade state monitoring system based on video image processing", the publication number of CN207195097U, the publication date of April 6, 2018, and the title of "A wind turbine blade defect remote monitoring system based on sound characteristics", the publication number of CN112885373A, and the publication date of June 1, 2021. These fan blade running state monitoring technologies based on voiceprint feature analysis are to collect the aerodynamic noise and structural vibration acoustic emission signals of the fan blade during operation, eliminate environmental noise interference by combining an adaptive filtering algorithm, extract sound wave characteristics (such as high-frequency harmonic distortion and sound pressure level mutation) specific to crack propagation, lightning damage and other faults, and realize accurate identification and hierarchical early warning of early faults of the fan blade. Compared with traditional contact sensor detection technology, it can cover the full length of the blade to realize dynamic monitoring without being limited by installation density, has less interference factors, realizes low-delay early warning through an edge computing module, can effectively reduce data transmission and cloud processing costs, can provide efficient and reliable technical support for safe and long-term operation and intelligent operation and maintenance of wind turbine blades in wind farms, and has remarkable technical effects.

[0005] However, in the disclosed voiceprint feature analysis monitoring technology for monitoring the running state of the fan blade, the structure design of the sound acquisition system is complex, and the sound acquisition sensor is rigidly fixed on the load-bearing foundation such as the fan tower, the nacelle and / or the fan blade. On the one hand, it increases the installation technical difficulty, and on the other hand, the sound acquisition sensor is easily affected by the rigid resonance of the installation foundation, which has adverse effects on the signal acquisition accuracy and the long-term effectiveness of the service life. Practical new type content

[0006] The technical purpose of the utility model is to provide a sound acquisition system for monitoring the fan blade based on the voiceprint feature analysis monitoring technology, which realizes stable and accurate monitoring with simple structure.

[0007] The technical purpose of the utility model is realized by the following technical scheme. A sound acquisition system for monitoring the fan blade, the sound acquisition system comprises a sound acquisition sensor, a front-end sound processor and a rear-end sound processor.

[0008] The sound collection sensor is arranged at the wind turbine generator set and is used to collect audio information of the wind turbine blade during operation, and the sound collection sensor is electrically connected with the front-end sound processor and performs information feedback.

[0009] The front-end sound processor is arranged at the wind turbine generator set, is electrically connected with the back-end sound processor and performs information interaction, is used to receive the audio information transmitted by the sound collection sensor, and transmits the collected audio information to the back-end sound processor at a set frequency.

[0010] The back-end sound processor is arranged at the central control room of the wind farm and is used to perform noise reduction and comparison analysis on the received audio information and output analysis results.

[0011] The above technical measures are aimed at the particularity of the wind turbine generator blade operation state monitoring, based on the current mature voiceprint feature analysis monitoring technology, and the sound collection sensor, the front-end sound processor and the back-end sound processor cooperated with each other form a sound collection system for wind turbine blade monitoring. Compared with the structures of the technologies disclosed in CN221610110U, CN207195097U and CN112885373A, the collection system is simple in structure, easy to implement, and conducive to stable and accurate monitoring of the operation state of the wind turbine blade.

[0012] As one of the preferred technical solutions, the sound collection sensor is fixed to the outer wall of the wind turbine tower, and a flexible vibration isolation pad is arranged between the sound collection sensor and the wind turbine tower and the fixing structure.

[0013] The sound collection sensor and the wind turbine tower and the fixing structure are in a non-rigid contact relationship.

[0014] The above technical measures arrange the sound collection sensor for collecting the sound of the wind turbine blade operation on the outer wall of the wind turbine tower and isolate and protect it with a flexible vibration isolation pad, avoiding the rigid contact relationship between the sound collection sensor and the wind turbine tower and the fixing structure, thereby reducing the adverse effects of the rigid resonance of the installation foundation on the operation stability of the sound collection sensor, which is conducive to the stable installation of the sound collection sensor, the accuracy of signal collection, the long-term service life of the sound collection sensor, and the stable and accurate monitoring of the operation state of the wind turbine blade.

[0015] As one of the preferred technical solutions, the sound collection sensors are three groups arranged at intervals along the circumference of the fan tower of the wind turbine generator set, wherein the 1# sound collection sensor is arranged on the fan tower corresponding to the main wind direction position, the 2# sound collection sensor is arranged on the fan tower corresponding to the right side of the 1# sound collection sensor, and the 3# sound collection sensor is arranged on the fan tower corresponding to the left side of the 1# sound collection sensor.

[0016] And in the circumferential direction of the fan tower, the 2# sound collection sensor and the 3# sound collection sensor are respectively matched with the 1# sound collection sensor at an included angle of 70-120°.

[0017] The above technical measures are aimed at the particularity that the impeller arranged at the nacelle of the wind turbine generator set adjusts the windward action and the windward action to adapt to the change of natural wind during operation, so that a group of sound collection sensors are formed in the main wind direction, and a group of sound collection sensors are respectively formed in the left and right sides of the yaw direction, to adapt to the change of the fan blades at different positions around the fan tower, and improve the reliability and accuracy of sound collection of the fan blades in operation.

[0018] Further, in the circumferential direction of the fan tower, the 2# sound collection sensor and the 3# sound collection sensor are respectively matched with the 1# sound collection sensor at an included angle of 90°. This technical measure is adapted to the change of the fan blades at different positions around the fan tower, and is beneficial to the accurate arrangement of each group of sound collection sensors on the fan tower under the premise of meeting the technical requirements of sound collection.

[0019] Further, the three groups of sound collection sensors are arranged at the same fixed height on the outer periphery of the fan tower and are fixed on the outer periphery of the fan tower by the same hoop assembly. This technical measure is adapted to the change of the fan blades at different positions around the fan tower, and is beneficial to the simple arrangement structure of each group of sound collection sensors on the fan tower under the premise of meeting the technical requirements of sound collection, and is easy to realize at low cost.

[0020] As one of the preferred technical solutions, the arrangement height position of the sound collection sensor on the fan tower is within the range of 4-7m from the ground surface of the fan tower.

[0021] Further, the arrangement height position of the sound collection sensor on the fan tower is at a distance of 5m from the ground surface of the fan tower.

[0022] The above technical measures, on the one hand, are beneficial to reducing the influence of the operation noise of the equipment (such as a tower base frequency converter, a box transformer, a water cooling system, etc.) at the bottom of the fan tower drum on the sound collection efficiency of the sound collection sensor collecting the operation sound of the fan blade; on the other hand, make the sound collection sensor easy to be installed and fixed on the fan tower drum; and on the third hand, effectively fit the tip-swept wind area in the rotating process of the fan blade to obtain better fan blade operation sound effect, which is much better than the collection effect at the engine room.

[0023] As one of the preferred technical solutions, the effective sound collection frequency range of the sound collection sensor is 100-15000 Hz. This technical measure can effectively cover the normal operation state and the fault operation state of the fan blade in the working range of the sound collection sensor, and comprehensively cover the operation sound of the fan blade in different states, so that the operation sound of the fan blade in different states can be clearly and accurately collected.

[0024] As one of the preferred technical solutions, the back-end sound processor is built in the field control server.

[0025] The field control server and the client device interact information in a remote communication cooperation relationship.

[0026] The above technical measures build the noise reduction and comparison analysis sound processor in the field control server based on the field control server in the central control room, which is beneficial to simplifying the equipment investment in the central control room, enriching the functions of the field control server, and making the communication relationship between the field control server and the client device so that the monitoring results of the sound collection system can be fed back to the client in a timely manner.

[0027] The beneficial technical effects of the utility model are as follows: the above technical measures are specific to the particularity of the above wind turbine generator set blade operation state monitoring, based on the current mature voiceprint feature analysis monitoring technology, the sound collection system for fan blade monitoring is composed of the sound collection sensor, the front-end sound processor and the back-end sound processor in a specific relationship, the sound collection sensor for collecting the operation sound of the fan blade is arranged on the outer wall of the fan tower drum corresponding to the tip-swept wind area, and the sound collection sensor is isolated and protected by the flexible vibration isolation pad on the outer wall of the fan tower drum, so that the adverse effects of rigid resonance on the operation stability of the sound collection sensor are reduced while better fan blade operation sound effect is obtained.

[0028] Compared with the technologies disclosed in CN 221610110 U, CN 207195097 U and CN 112885373 A, the sound collection system has simple system structure and is easy to implement, which is beneficial to realizing stable and accurate monitoring of the operation state of the fan blade. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1A principle block diagram of the utility model.

[0030] Figure 2 The structure schematic diagram of the arrangement position of the sound collection sensor of the utility model on the fan.

[0031] Figure 3 The structure schematic diagram of the fixed arrangement of the sound collection sensor of the utility model at the fan tower drum.

[0032] Code meaning in the drawing: 1 - sound collection sensor, 11 - 1# sound collection sensor, 12 - 2# sound collection sensor, 13 - 3# sound collection sensor, 2 - front end sound processor, 3 - rear end sound processor, 4 - client device, 5 - wind turbine generator unit, 51 - fan blade, 52 - fan tower drum, 6 - flexible vibration isolation pad, 7 - hoop assembly. DETAILED DESCRIPTION

[0033] The utility model relates to wind turbine generator unit blade state monitoring technical field, concretely is a kind of sound collection system for fan blade monitoring, the main technical scheme content of the utility model is specifically explained below in conjunction with multiple embodiments. Among them, embodiment 1 is explained in conjunction with the drawing of specification, i.e. Figure 1 、 Figure 2 And Figure 3 The technical scheme content of the utility model is clearly and detailedly explained, other embodiments are not drawn separately, but the main structure can still refer to the drawing of embodiment 1.

[0034] It needs to be specially stated here that the drawing of the utility model is schematic, it has simplified unnecessary details for the sake of the technical purpose of the utility model to avoid the technical scheme of the utility model contribution to the prior art is blurred. In addition, the "about", "substantially" and the like in the following quantity or cooperation relationship are expressed, the meaning is that reasonable assembly error, machining error and the like are allowed in the industry, not literal expression absolute quantity or cooperation relationship.

[0035] Embodiment 1

[0036] Refer to Figure 1As shown, the sound acquisition system of the utility model includes sound acquisition sensor 1, front end sound processor 2 and rear end sound processor 3. Among them, sound acquisition sensor 1 is three groups, divided into 1# sound acquisition sensor 11, 2# sound acquisition sensor 12 and 3# sound acquisition sensor 13 of mutually independent operation; three groups of sound acquisition sensor 1 are same in specification, and the effective acquisition sound frequency range is 100~15000Hz. Sound acquisition sensor 1 is electrically connected with front end sound processor 2, and carries out information feedback, and the working power supply is provided to sound acquisition sensor 1 by front end sound processor 2. Front end sound processor 2 is electrically connected with rear end sound processor 3, and carries out information interaction. Rear end sound processor 3 and client device 4 carry out information interaction with remote communication cooperation relationship.

[0037] As shown in Figure 2 And Figure 3 As shown, sound acquisition sensor 1 is arranged at the fan tower drum 52 of the wind turbine generator set 5 and is used for collecting audio information of the fan blade 51 during operation.

[0038] Specifically, to adapt to the change of the fan blade 51 at different positions around the fan tower drum 52, the above-mentioned three groups of sound acquisition sensor 1 are arranged at intervals along the tower drum 52 of the wind turbine generator set 5. Among them, 1# sound acquisition sensor 11 is arranged on the fan tower drum 52 corresponding to the main wind direction position. With the main wind direction position as the front, 2# sound acquisition sensor 12 is arranged at intervals on the fan tower drum 52 corresponding to the right side of 1# sound acquisition sensor 11, and 3# sound acquisition sensor 13 is arranged at intervals on the fan tower drum 52 corresponding to the left side of 1# sound acquisition sensor 11, as the best choice, 2# sound acquisition sensor 12 and 3# sound acquisition sensor 13 are respectively cooperated with 1# sound acquisition sensor 11 at an angle of about 90° around the fan tower drum 52. In this way, when the fan blade 51 is in the main wind direction, the rotation track of the fan blade 51 is close to 1# sound acquisition sensor 11, and the running sound is collected by 1# sound acquisition sensor 11; as the basis of the main wind direction, when the fan blade 51 rotates to the left or to the right to yaw, the rotation track of the fan blade 51 approaches 2# sound acquisition sensor 12 / 3# sound acquisition sensor 13, and the running sound is collected by the corresponding 2# sound acquisition sensor 12 / 3# sound acquisition sensor 13. To ensure that the sound acquisition sensor 1 can accurately collect the running sound of the fan blade 51 in the windward state or the leeward state of the wind turbine generator set 4, so as to ensure the safe operation of the fan blade 51 of the wind turbine generator set 4.

[0039] In order to simplify the fixed arrangement structure of the three groups of sound collection sensors 1 on the outer wall of the fan tower 52, the three groups of sound collection sensors 1 are arranged at a same fixed height on the outer periphery of the fan tower 52 and are fixed on the outer periphery of the fan tower 52 by the same hoop assembly 7. In order to facilitate the installation and maintenance of the sound collection sensors 1 on the outer wall of the fan tower 52 and to obtain better operating sound at the blade tip sweeping area of the fan blade 51, the arrangement height position of the sound collection sensors 1 on the fan tower 52 is at about 5m from the ground surface of the fan tower 52. This height position can also effectively reduce the interference of the operating noise of the equipment at the bottom of the fan tower 52, such as the tower base frequency converter, the box transformer and the water cooling system, on the working effect of the sound collection sensors 1.

[0040] Due to the rigid support structure of the fan tower 52, there is a rigid resonance phenomenon during service. If the sound collection sensors 1 are directly fixed on the outer wall of the fan tower 52, the sound collection sensors 1 will be affected by the rigid resonance of the fan tower 52, which will affect the stability and service life of the arrangement and will also interfere with the accuracy of signal collection. Therefore, the fixation of the above three groups of sound collection sensors 1 on the outer wall of the fan tower 52 is to provide flexible isolation protection for each group of sound collection sensors 1. That is, each group of sound collection sensors 1 is in contact with the outer wall of the fan tower 52 through the flexible vibration isolation pad 6, and the hoop assembly 7 also contacts the corresponding sound collection sensor 1 through the flexible vibration isolation pad 6. In this way, each group of sound collection sensors 1 and the fan tower 52 and the hoop assembly 7 are respectively in contact with the flexible vibration isolation pad 6, that is, the sound collection sensors 1 and the fan tower 52 and the hoop assembly 7 are in a non-rigid contact relationship.

[0041] The front-end sound processor 2 is arranged at the bottom of the fan tower 52 of the wind turbine generator set 5 and is used to receive the audio information transmitted by the above-mentioned sound collection sensors 1 and transmit the collected audio information (for example, 15 seconds or 30 seconds) to the back-end sound processor 3 at a set frequency (for example, half an hour or one hour). That is, the front-end sound processor 2 plays a role of power supply to the sound collection sensors 1, collection and storage of audio information, and forwarding of part of the audio information according to the set frequency.

[0042] The back-end sound processor 3 is arranged at the central control room of the wind farm and is preferably built-in in the field control server. The back-end sound processor 3 is used for noise reduction and comparison analysis of the received audio information, so as to remotely output the analysis results to the central control room and the client device 4 through the field control server.

[0043] It needs to be specially pointed out that the above-mentioned front-end sound processor 2 and rear-end sound processor 3 are not the technical contribution of the utility model, and both adopt the existing mature technology. For example, the rear-end sound processor 3 corresponds to the noise reduction processing module and the sound comparison analysis terminal in the technology with the publication number CN221610110U. The technical contribution of the utility model mainly lies in the system logic relationship between the sound collection sensor 1, the front-end sound processor 2 and the rear-end sound processor 3, and the arrangement structure of the sound collection sensor 1 on the fan tower 52.

[0044] Embodiment 2

[0045] The other contents of this embodiment are the same as those of embodiment 1, and the difference lies in that:

[0046] On the circumference of the fan tower, the 2# sound collection sensor and the 3# sound collection sensor are respectively matched with the 1# sound collection sensor at an included angle of about 70°.

[0047] Embodiment 3

[0048] The other contents of this embodiment are the same as those of embodiment 1, and the difference lies in that:

[0049] On the circumference of the fan tower, the 2# sound collection sensor and the 3# sound collection sensor are respectively matched with the 1# sound collection sensor at an included angle of about 110°.

[0050] Embodiment 4

[0051] The other contents of this embodiment are the same as those of embodiment 1, and the difference lies in that:

[0052] On the circumference of the fan tower, the 2# sound collection sensor and the 3# sound collection sensor are respectively matched with the 1# sound collection sensor at an included angle of about 120°.

[0053] Embodiment 5

[0054] The other contents of this embodiment are the same as those of embodiment 1, and the difference lies in that:

[0055] The arrangement height position of the sound collection sensor on the fan tower is at about 4 of the fan tower from the ground surface.

[0056] Embodiment 6

[0057] The other contents of this embodiment are the same as those of embodiment 1, and the difference lies in that:

[0058] The arrangement height position of the sound collection sensor on the fan tower is at about 6 of the fan tower from the ground surface.

[0059] Embodiment 7

[0060] The other contents of the embodiment are the same as those of Embodiment 1, except that:

[0061] The arrangement height position of the sound collection sensor on the fan tower drum is at about 7 from the foundation surface.

[0062] Embodiment 8

[0063] The other contents of the embodiment are the same as those of Embodiment 1, except that:

[0064] The sound collection sensor is a group.

[0065] Of course, the embodiment will cause the fan blade to be away from the sound collection sensor due to the circumferential position adjustment of the fan blade in the operation of the wind turbine, thereby affecting the sound collection effect.

[0066] Embodiment 9

[0067] The other contents of the embodiment are the same as those of Embodiment 1, except that:

[0068] The hoop assembly is replaced by a support structure fixed on the outer wall of the fan tower drum, that is, the corresponding support is fixedly connected to the outer wall of the fan tower drum, and the clamping structure for clamping the sound collection sensor is formed on the support.

[0069] The above embodiments are only used to illustrate the present application, but not to limit it.

[0070] Although the present application is described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the above embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not change the essence of the corresponding technical solutions, and do not deviate from the spirit and scope of the present application.

Claims

1. A sound collection system for wind turbine blade monitoring, characterized in that: the sound collection system comprises a sound collection sensor (1), a front-end sound processor (2) and a back-end sound processor (3) ; the sound collection sensor (1) is arranged at a wind turbine generator set (5) and used for collecting audio information of a wind turbine blade (51) in operation, and the sound collection sensor (1) is electrically connected to the front-end sound processor (2) and used for information feedback; the front-end sound processor (2) is arranged at the wind turbine generator set (5), and the front-end sound processor (2) is electrically connected to the back-end sound processor (3) and used for information interaction; the front-end sound processor (2) is used for receiving the audio information transmitted by the sound collection sensor (1) and transmitting the collected audio information to the back-end sound processor (3) at a set frequency; and the back-end sound processor (3) is arranged at a central control room of a wind farm and used for noise reduction and comparison analysis of the received audio information and output of an analysis result. 2.The sound collection system for wind turbine blade monitoring according to claim 1, characterized in that: the sound collection sensor (1) is fixed to an outer wall of a wind turbine tower (52) of the wind turbine generator set (5), and a flexible vibration isolation pad (6) is arranged between the sound collection sensor (1) and the wind turbine tower (52) and a fixing structure; and the sound collection sensor (1) is matched with the wind turbine tower (52) and the fixing structure in a non-rigid contact relationship. 3.The sound collection system for wind turbine blade monitoring according to claim 1 or 2, characterized in that: the sound collection sensor (1) is three groups of sound collection sensors arranged at intervals along a circumferential direction of the wind turbine tower (52) of the wind turbine generator set (5), wherein a first sound collection sensor (11) is arranged at a position corresponding to a main wind direction on the wind turbine tower (52), a second sound collection sensor (12) is arranged at an interval on the right side of the first sound collection sensor (11) on the wind turbine tower (52), and a third sound collection sensor (13) is arranged at an interval on the left side of the first sound collection sensor (11) on the wind turbine tower (52) ; and in the circumferential direction of the wind turbine tower (52), the second sound collection sensor (12) and the third sound collection sensor (13) are matched with the first sound collection sensor (11) at an included angle of 70-120°. 4.The sound collection system for wind turbine blade monitoring according to claim 3, characterized in that: in the circumferential direction of the wind turbine tower (52), the second sound collection sensor (12) and the third sound collection sensor (13) are matched with the first sound collection sensor (11) at an included angle of 90°. 5.The sound collection system for wind turbine blade monitoring according to claim 3, characterized in that: in the circumferential direction of the wind turbine tower (52), the three groups of sound collection sensors (1) are arranged at the same fixed height and are fixed to the circumferential direction of the wind turbine tower (52) by the same hoop assembly (7). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 6. The sound collection system for monitoring the fan blade according to claim 1, 2, 4 or 5, characterized in that: The arrangement height position of the sound collection sensor (1) on the fan tower (52) is within the range of 4-7 m from the ground surface.

7. The sound collection system for monitoring the fan blade according to claim 6, characterized in that: The arrangement height position of the sound collection sensor (1) on the fan tower (52) is at 5 m from the ground surface.

8. The sound collection system for monitoring the fan blade according to claim 1, characterized in that: The effective sound frequency range of the sound collection sensor (1) is 100-15000 Hz.

9. The sound collection system for monitoring the fan blade according to claim 1, characterized in that: The back-end sound processor (3) is built in the field control server; The field control server and the client device (4) interact information in the remote communication cooperation relationship.

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