CN117685179A - Fan variable pitch system monitoring method, monitoring equipment and storage medium - Google Patents
Fan variable pitch system monitoring method, monitoring equipment and storage medium Download PDFInfo
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Abstract
The application provides a fan variable pitch system monitoring method, monitoring equipment and storage medium, relates to the technical field of wind power generation, and the method is applied to the monitoring equipment for monitoring the fan variable pitch system, and the monitoring equipment comprises the following components: a first electromagnetic material trigger strip and an eddy current sensor; the first electromagnetic material trigger belt is arranged at the outer edge of the blade root of the fan blade and at least covers one fourth of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt; the method comprises the following steps: acquiring a trigger waveform signal generated by an eddy current sensor through a first electromagnetic material trigger belt; based on the trigger waveform signal, a pitch state of the fan pitch system is identified. Through utilizing first electromagnetic material trigger area and eddy current sensor discernment to become oar state, provide the trigger acquisition signal of acquisition system demand, can compromise multiple variable oar structure, data processing logic is simple, and the practicality is high, with low costs.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a monitoring method, monitoring equipment and a storage medium of a fan pitch system.
Background
All parts of a variable pitch system of the wind driven generator are arranged on a hub, all parts rotate at a certain speed along with the hub during normal operation of the wind driven generator, blades (root parts) of the wind driven generator are connected with the hub through variable pitch bearings, the variable pitch system controls the rotating speed of a wind wheel through controlling the angles of the blades, the output power of the wind driven generator is further controlled, and the wind driven generator can be safely stopped in an aerodynamic braking mode. The opening and closing of the blade angle has larger influence on the change of the integral vibration of the fan, and under the condition that the corresponding parameters of the SCADA system of the fan cannot be obtained, the obtaining of the relevant parameters such as the variable pitch opening and feathering, the variable pitch rotating speed, the blade angle state and the like through an external monitoring mode has larger significance for fan monitoring, such as blade monitoring, variable pitch bearing monitoring, tower drum monitoring, transmission chain monitoring and the like.
At present, due to randomness of movement of a pitch bearing and variability of continuous operation time, the acquisition of operation data of a pitch bearing has certain difficulty, and further the pitch working condition of the system is difficult to monitor. On one hand, the difficulty is that the feathering time is long, the feathering time is short, the feathering is the motion under two working conditions, and the same unit has the change in each feathering time; on the other hand, the difficulty is that on the premise of not accessing the feathering state data of the SCADA system, the feathering state and the feathering time are difficult to obtain, and further the acquisition of the data in the pitching process is influenced.
Disclosure of Invention
In view of this, an object of the embodiments of the present application is to provide a fan pitch system monitoring method, a monitoring device and a storage medium, by installing a first electromagnetic material trigger band at an outer edge of a blade root without being affected by a pitch structural form under a condition of not depending on fan SCADA system parameter reading, and using an eddy current sensor to identify a pitch state (pitch direction, pitch angle, pitch rotation speed), provide a trigger acquisition signal required by an acquisition system, and identify and acquire four parameters of a pitch state (pitch, feathering), a pitch angle, a pitch rotation speed, and a pitch motor working condition as a supplement of working condition signals of fan vibration monitoring (transmission chain monitoring, blade monitoring, tower monitoring, etc.), the fan pitch system has a plurality of pitch structures, and has a simple data processing logic, a high practicality, and a low cost, thereby solving the technical problems described above.
In a first aspect, an embodiment of the present application provides a method for monitoring a fan pitch system, where the method is applied to a monitoring device for monitoring the fan pitch system, and the monitoring device includes: a first electromagnetic material trigger strip and an eddy current sensor; the first electromagnetic material trigger belt is arranged at the outer edge of the blade root of the fan blade and at least covers one quarter of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt; the method comprises the following steps: acquiring a trigger waveform signal generated by the eddy current sensor through the first electromagnetic material trigger belt; and identifying the pitch state of the fan pitch system based on the trigger waveform signal.
In the implementation process, under the condition of independent fan SCADA system parameter reading and without being influenced by a variable pitch structural form, the first electromagnetic material trigger belt is arranged at the outer edge of the blade root, the variable pitch state (variable pitch direction, variable pitch angle and variable pitch rotating speed) is identified by using the electric vortex sensor, trigger acquisition signals required by an acquisition system are provided, various variable pitch structures can be considered, the data processing logic is simple, the practicability is high, and the cost is low.
Optionally, a second electromagnetic material sheet is arranged on the surface of the first electromagnetic material trigger belt, and the magnetic permeability of the first electromagnetic material trigger belt is larger than that of the second electromagnetic material sheet; the pitch state includes: a pitch direction; based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises: determining trigger waveform amplitude values corresponding to the setting positions of the first electromagnetic material trigger band and the second electromagnetic material sheet based on the characteristics of the trigger waveform signals; wherein the trigger waveform amplitude comprises: a first differential amplitude near the head end and a second differential amplitude far from the head end; if the first difference amplitude is larger than the second difference amplitude, identifying that the pitch direction of the fan pitch system is a pitch; and if the first difference amplitude is smaller than the second difference amplitude, identifying that the pitch direction of the fan pitch system is feathering.
In the implementation process, the second electromagnetic material sheet with smaller magnetic conductivity is additionally arranged on the upper surface of the first electromagnetic material trigger belt, so that the determined pitch direction can be judged through the amplitude difference of the trigger waveform at the position, the method is convenient and quick, and the identification efficiency is improved.
Optionally, the first electromagnetic material trigger belt surface is provided with a plurality of second electromagnetic material sheets; the pitch state further comprises: blade angular position; based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises: and determining the blade angle position corresponding to the setting position of the first electromagnetic material trigger belt and the second electromagnetic material sheet based on the trigger waveform amplitude of the trigger waveform signal.
In the implementation process, the blade angular position is identified through the difference characteristics of trigger waveforms caused by materials with different magnetic permeability, so that the stability and accuracy of blade angular position identification are improved.
Optionally, the surface of the first electromagnetic material trigger belt is provided with a plurality of through holes at equal intervals; the pitch state includes: a pitch angle is changed; based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises: determining the quantity of the trough of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signal; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero; determining the quotient of 90 DEG, the number of wave crests and the sum of the number of wave troughs as the identification precision of the pitch angle; wherein the number of peaks is determined based on the number of valleys.
In the implementation process, through fixing the holes on the steel belt, the angle of the variable pitch change can be determined according to the length of the trigger belt and the number of the wave troughs and wave peaks of the trigger waveform, and the accuracy and the stability of the identification of the variable pitch angle are improved.
Optionally, the surface of the first electromagnetic material trigger belt is provided with a plurality of through holes at equal intervals; the pitch state includes: the rotating speed of the variable pitch; based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises: determining the trough length and duration of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signals; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero; calculating the average rotating speed of each section length in a segmented manner according to each trough length, each crest length and the duration; wherein the peak length is determined based on the trough length; and carrying out connection processing on the average rotating speed to obtain the variable pitch rotating speed.
In the implementation process, through fixing the holes on the steel belt, the variable pitch rotating speed can be determined according to the length of the trigger belt, the hole distance and the number of wave troughs and wave peaks of the trigger waveform, and the identification accuracy and stability of the variable pitch rotating speed are improved.
Optionally, the first electromagnetic material trigger band comprises: stainless steel strip; the second sheet of electromagnetic material comprises: an aluminum sheet.
In the implementation process, the stainless steel belt and the aluminum sheet are selected as the first electromagnetic material trigger belt and the second electromagnetic material sheet, so that the cost is low.
Optionally, the probe size of the eddy current sensor is positively correlated with the accuracy of pitch angle identification.
In the implementation process, through setting up the electric vortex sensor of suitable probe size, and then the recognition accuracy of steerable pitch angle has improved the recognition accuracy of pitch angle.
In a second aspect, embodiments of the present application provide a monitoring device, the device comprising: a first electromagnetic material trigger belt, an eddy current sensor and a controller; the first electromagnetic material triggering belt is arranged at the outer edge of the blade root of the fan blade and at least covers one quarter of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt; the controller is used for: acquiring a trigger waveform signal generated by the eddy current sensor through the first electromagnetic material; the controller is further configured to: and identifying the pitch state of the fan pitch system based on the trigger waveform signal.
Optionally, the monitoring device further comprises: a second sheet of electromagnetic material; the surface of the first electromagnetic material trigger belt is provided with a second electromagnetic material sheet, and the magnetic permeability of the first electromagnetic material trigger belt is inconsistent with that of the second electromagnetic material sheet; the controller is used for: determining trigger waveform amplitude values corresponding to the setting positions of the first electromagnetic material trigger band and the second electromagnetic material sheet based on the characteristics of the trigger waveform signals; wherein the trigger waveform amplitude comprises: a first differential amplitude near the head end and a second differential amplitude far from the head end; the controller is further configured to: if the first difference amplitude is larger than the second difference amplitude, identifying that the pitch direction of the fan pitch system is a pitch; the controller is further configured to: and if the first difference amplitude is smaller than the second difference amplitude, identifying that the pitch direction of the fan pitch system is feathering.
In a third aspect, embodiments of the present application further provide an electronic device, including: a processor, a memory storing machine-readable instructions executable by the processor, which when executed by the processor perform the steps of the method described above when the electronic device is run.
In a fourth aspect, embodiments of the present application provide a storage medium having a computer program stored thereon, which when executed by a processor performs the steps of the method described above.
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for monitoring a fan pitch system according to an embodiment of the present application;
FIG. 2 is a schematic view of a steel strip installation provided in an embodiment of the present application;
fig. 3 is a schematic diagram of installation of a monitoring device according to an embodiment of the present application;
FIG. 4 is a diagram illustrating a pitch operating condition identification example provided by an embodiment of the present application;
Fig. 5 is a schematic block diagram of a monitoring device according to an embodiment of the present application;
fig. 6 is a block schematic diagram of an electronic device according to an embodiment of the present application.
Icon: 210-a first electromagnetic material trigger band; 220-an eddy current sensor; 230-a controller; 300-an electronic device; 311-memory; 312-a storage controller; 313-processor; 314-peripheral interface; 315-an input-output unit; 316-display unit.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Before describing the embodiments of the present application, a brief description will be first made of technical concepts related to the present application.
Fan pitch system motion law: the fan variable pitch structure is mainly a variable pitch bearing, the inner and outer rings of which are respectively connected with the blade root part and the hub, and the fan variable pitch structure is used as a connecting piece for connecting the blade with the hub. And a power driving device (a variable pitch speed reducer or a belt) is added on the inner ring or the outer ring of the variable pitch bearing to drive the inner ring or the outer ring of the variable pitch bearing to rotate, so that the fan blades rotate for a certain angle, and feathering is realized. The variable-pitch bearing mainly comprises an inner ring rotating mode, an outer ring fixing mode, an inner ring fixing mode and an outer ring rotating mode, blades are in two states of pitch opening and feathering, in the switching process of the two states, the variable-pitch bearing is in forward and reverse rotation, namely when the blades are opened, the blade angle is changed from 90 degrees to 0 degrees, and when the blades are feathered, the blade angle is changed from 0 degrees to 90 degrees. The time difference between the opening and feathering is larger, and the opening and feathering states have randomness when the fan operates.
Hub (g ǔ): the hub is a stationary part for connecting the blades to the rotating main shaft, which transfers the loads of the blades to the support structure of the wind turbine, i.e. eventually to the tower. The hub has various types according to the diameter, width, forming mode and materials.
An encoder: is a device that compiles, converts, or processes signals (e.g., bitstreams) or data into a form of signals that can be communicated, transmitted, and stored. The encoder converts angular displacement, referred to as a code wheel, or linear displacement, referred to as a code scale, into an electrical signal. Encoders can be classified into contact type and non-contact type according to the read-out mode; encoders can be classified into incremental and absolute types according to the operating principle. The incremental encoder converts the displacement into a periodic electric signal, and then converts the electric signal into counting pulses, and the number of the pulses is used for representing the size of the displacement. Each position of the absolute encoder corresponds to a determined digital code, and thus its indication is only related to the start and end positions of the measurement, and not to the intermediate course of the measurement.
Hall proximity switch: when the magnetic object moves close to the Hall switch, the Hall element on the switch detection surface changes the state of an internal circuit of the switch due to the Hall effect, so that the existence of the magnetic object nearby is identified, and the on or off of the switch is controlled; the detection object of such a proximity switch must be a magnetic object.
An eddy current sensor: the eddy current sensor accurately measures the relative position of the measured object and the probe end face through the eddy current effect principle, and is characterized by good long-term working reliability, high sensitivity, strong anti-interference capability, non-contact measurement, high response speed, no influence of oil-water and other mediums, and is often used for long-term real-time monitoring of parameters such as shaft displacement, shaft vibration, shaft rotating speed and the like of large-scale rotating machinery, so that the working condition and fault cause of equipment can be analyzed, and the equipment can be effectively protected and pre-maintained.
The inventor of the present application notes that there are three main ways to monitor the variable pitch condition of a fan in the prior art: (1) The rotary direction and speed are identified by the optical pair-tube encoder, and the rotary direction and speed are measured by the incremental encoder. The measuring method is good for counting and counting, both rotary type and linear motion type can be effectively monitored, but the length of the measured object is required to be larger than or close to the installation distance of the two encoders, otherwise, the rising edges and the falling edges of the two encoders cannot be compared, and the direction identification and the rotation speed measurement are invalid. In addition, due to the adoption of photoelectric effect, the requirements on the surface of the object to be tested and the installation environment of the encoder are strict, and the encoder cannot be used in environments with larger vibration. (2) Wind power pitch identification is performed by arranging a pair of Hall switches. The detection device for the pitch direction and the angle of the wind generating set comprises: the device comprises a variable pitch bearing, a proximity switch mounting bracket and Hall proximity switches, wherein the proximity switch mounting bracket is fixed on a hub at a position close to an inner gear ring of the variable pitch bearing, and the two Hall proximity switches are fixed on the proximity switch mounting bracket. The detection method comprises the following steps: a. the two Hall proximity switches are connected into a high-speed counting module of the variable pitch controller 220 through a shielded cable; b. when the pitch is changed, the two Hall proximity switches convert the relative motion between the Hall proximity switches and the inner gear ring of the pitch bearing into a signal similar to square waves; and c, judging and calculating output signals of the Hall proximity switch by the PLC internal program to obtain the direction and the angle of the variable pitch. The two Hall switches are used, so that the triggering distance of the Hall switches is required, the installation distance between the Hall switches is required to be 1.25 times, and certain difficulty is brought to batch use or later maintenance, and more specialized personnel are required to debug. Meanwhile, on the aspects of installation difficulty and maintenance cost: the method has high installation precision in a single device, and different distance adjustment (the wheelbase of two Hall switches) is required to be carried out according to different variable-pitch bearing parameters. (3) pitch identification using redundant encoder configuration. In a pitch system of a large wind generating set, a redundant encoder configuration is generally adopted, an absolute value encoder is arranged on a motor shaft of each pitch generator, and a redundant absolute value encoder for measuring pitch angle is arranged near a pitch bearing. The fan master control receives signals of all encoders, the pitch system only applies signals of the motor tail encoder, and the fan master control only controls the pitch system to apply signals of the redundant encoder when the motor tail encoder fails. When the angle deviation of the two encoders is overlarge, the pitch control system receives the pitch to protect the fan, and the pitch control system is prevented from continuing to operate after the encoders are failed. For variable pitch devices with different structures, such as toothed belt transmission modes and no transmission gear ring, the scheme cannot be carried out, and the scheme can be used only for the form with the gear ring.
In view of this, the embodiments of the present application provide a fan pitch system monitoring method, a monitoring device and a storage medium as described below.
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a method for monitoring a fan pitch system according to an embodiment of the present application. The embodiments of the present application are explained in detail below. The method is applied to monitoring equipment for monitoring a fan pitch system, and the monitoring equipment comprises the following steps: a first electromagnetic material trigger strip and an eddy current sensor; the first electromagnetic material trigger belt is arranged at the outer edge of the blade root of the fan blade and at least covers one fourth of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt; the method comprises the following steps: step 100 and step 120.
Step 100: acquiring a trigger waveform signal generated by an eddy current sensor through a first electromagnetic material trigger belt;
step 120: based on the trigger waveform signal, a pitch state of the fan pitch system is identified.
Illustratively, the first electromagnetic material trigger strip may be: the first electromagnetic material trigger belt is arranged at the outer edge of the blade root of the fan blade, the head end of the first electromagnetic material trigger belt can be aligned with the blade angle at 0 degree, the whole first electromagnetic material trigger belt at least covers 1/4 (90 degrees) of the outer diameter of the blade root, and the first electromagnetic material trigger belt can be made of various metal materials such as gold, silver, aluminum, iron and the like, and can also be made of various magnetic materials such as stainless steel, ferromagnetism and the like. The eddy current sensor may be: the electronic sensor is arranged at the position of the wheel hub corresponding to the head end of the first electromagnetic material trigger belt and can generate induced current based on the eddy current effect between the electronic sensor and the first electromagnetic material trigger belt; when the eddy current sensor is powered on, an alternating magnetic field is generated in the coil of the head of the probe, and when the whole first electromagnetic material trigger belt (such as a steel belt) passes through the eddy current sensor, induced current (eddy current) is generated on the corresponding surface of the first electromagnetic material trigger belt due to the eddy current effect, meanwhile, the eddy current magnetic field also generates an alternating magnetic field with the opposite direction to the coil of the head of the sensor, and the amplitude and the phase of the high-frequency current of the head coil are changed due to the reaction of the alternating magnetic field, and the change is related to the magnetic conductivity, the size, the shape and the trigger distance of the first electromagnetic material trigger belt.
Alternatively, as shown in fig. 2, the first electromagnetic material trigger belt of the following embodiment is described by taking a steel belt as an example, and the steel belt may be a thin stainless steel belt, and the length of the steel belt may be 1500×100mm and the thickness may be 0.03mm. The length of the steel belt can be about 1/4 of the perimeter of She Genyuan, the lengths of the steel belts are inconsistent among different manufacturers and different types of units, and the steel belts can be correspondingly customized according to the needs. The monitoring device may comprise 1 steel strip, 1 eddy current sensor, 1 sensor holder, the trigger steel strip is adhesively mounted on the blade root surface, one end of the steel strip is aligned with the blade angle 0 ° position, and the whole steel strip covers 1/4 (90 °) of the blade root outer diameter. An eddy current sensor is arranged on a sensor support of the open end of the steel belt corresponding to the position of the hub, and the distance between the eddy current sensor and the surface of the steel belt is adjusted within the triggering distance of the eddy current sensor. When the blade angle starts to rotate, the blade root drives the steel belt to rotate, the steel belt passes through the position of the eddy current sensor, the steel belt and the eddy current sensor are sequentially triggered, the eddy current sensor is triggered to form wave peaks with different heights, voltage waveform signals with different amplitudes are output, and the identification of the pitch-variable states such as the pitch-variable direction, the pitch-variable speed, the pitch-variable angle and the like can be realized by utilizing the amplitude difference of the trigger waveform and the number of the wave peaks and the wave troughs of the trigger waveform.
Under the condition that parameters of a fan SCADA system are not dependent on reading, the fan SCADA system is not influenced by a variable pitch structural form, a first electromagnetic material trigger belt is arranged at the outer edge of a blade root, a variable pitch state (a variable pitch direction, a variable pitch angle and a variable pitch rotating speed) is identified by using an eddy current sensor, a trigger acquisition signal required by an acquisition system is provided, various variable pitch structures can be considered, and the fan SCADA system has the advantages of simple data processing logic, high practicality and low cost.
In one embodiment, the first electromagnetic material trigger belt surface is provided with a second electromagnetic material sheet, and the magnetic permeability of the first electromagnetic material trigger belt is greater than the magnetic permeability of the second electromagnetic material sheet; the pitch state includes: a pitch direction; step 120 may include: step 121, step 122 and step 123.
Step 121: determining trigger waveform amplitude values corresponding to the setting positions of the first electromagnetic material trigger band and the second electromagnetic material sheet based on the characteristics of the trigger waveform signals; wherein the trigger waveform amplitude comprises: a first differential amplitude near the head end and a second differential amplitude far from the head end;
step 122: if the first difference amplitude is larger than the second difference amplitude, the pitch direction of the fan pitch system is recognized as the pitch;
Step 123: and if the first difference amplitude is smaller than the second difference amplitude, identifying that the pitch direction of the fan pitch system is feathering.
Illustratively, the second sheet of electromagnetic material may be: a sheet of magnetic permeability material, different from the material of the first electromagnetic material trigger strip, capable of inducing a signal gap of the eddy current sensor, for example: the first electromagnetic material trigger belt is a steel belt, and the second electromagnetic material sheet can be an aluminum sheet, an iron sheet, a gold sheet, a silver sheet and the like; the conditions to be met by the two are as follows: the magnetic permeability of the first electromagnetic material trigger belt is greater than the magnetic permeability of the second electromagnetic material sheet. The steel belt is composed of two materials, the base band is a stainless steel sheet, an aluminum sheet is stuck on the basis of the stainless steel sheet, the magnetic permeability of the aluminum sheet is inconsistent with that of the steel sheet, and the eddy current sensor is different in the reaction of the head part of the eddy current sensor due to the fact that the magnetic permeability of the aluminum sheet and the magnetic permeability of the steel sheet are different, so that the difference of the aluminum sheet and the steel sheet is utilized to capture the movement direction of the sensor.
Alternatively, as shown in fig. 3, the first electromagnetic material triggering belt is described by taking a steel belt as an example, the second electromagnetic material sheet is described by taking an aluminum sheet as an example, and the installation modes of the first electromagnetic material triggering belt and the second electromagnetic material sheet can be as follows: the starting point of the front end of the steel belt is aligned with the 0-degree position of the blade angle, and the whole steel belt is rotatably arranged to the rear edge of the steel belt from the 0-degree position along the direction of opening the blade by 90 degrees. It should be understood that: if the specific installation mode is reverse, the judgment of opening and feathering should be correspondingly recognized in the reverse direction. An aluminum thin plate is arranged on the upper surface of the head end of the steel belt in a superposition mode, and a certain trigger distance exists between an eddy current sensor arranged on the sensor bracket and the steel belt. The magnetic permeability of the steel strip is larger than that of the aluminum sheet (or other materials), the generated eddy current amplitude values of the eddy current sensors at the same distance are inevitably different, and the difference of the waveform amplitude values of the aluminum sheet and the steel strip can be just used for identifying the rotating direction of the steel strip due to the fact that the aluminum sheet and the steel strip are very close, even if the shape of the outer edge of the blade root is irregular or the installation error of the steel strip is caused in a very short distance, the difference of the waveform amplitude values of the aluminum sheet and the steel strip is not influenced. When the blade root rotates, the steel belt and the eddy current sensor are triggered in sequence, the eddy current sensor outputs voltage signals with different amplitudes, as shown in fig. 4, the eddy current sensor sequentially passes through waveforms formed when the whole steel belt, wave peaks are generated at the positions of the steel belt and the aluminum sheet, and the wave peaks formed at the positions of the steel belt and the aluminum sheet are inconsistent due to the fact that the magnetic permeability of the steel belt is inconsistent with that of the steel belt, the wave peaks formed at the positions of the steel belt and the aluminum sheet are inconsistent in the waveforms, and the wave peaks at the positions of the aluminum sheet are slightly high. When the high-low amplitude a (first difference amplitude) of the trigger waveform is earlier than b (second difference amplitude), the rotation of the pitch direction can be indicated, otherwise, if b is earlier than a, the rotation of the feathering direction can be indicated. In particular, during the complete pitch process, the number of wave crests and wave troughs of the trigger waveform is consistent with that of fig. 4, and meanwhile, if the first difference amplitude a is equal to the second difference amplitude b, the magnetic permeability of the two materials is the same or identification faults occur, and the pitch direction cannot be identified and judged.
Through add the second electromagnetic material sheet metal that the permeability is less at first electromagnetic material trigger area upper surface, can realize that the amplitude difference through this position department trigger waveform judges the variable pitch direction of discernment determination, convenient and fast has improved recognition efficiency.
In one embodiment, the first electromagnetic material trigger belt surface is provided with a plurality of sheets of a second electromagnetic material; the pitch state further comprises: blade angular position; step 120 may include: step 124.
Step 124: and determining the blade angle position corresponding to the setting position of the first electromagnetic material trigger belt and the second electromagnetic material sheet based on the trigger waveform amplitude of the trigger waveform signal.
In one embodiment, because a certain blade angle repeatedly fluctuates in the pitch process, if an aluminum sheet is not arranged on the steel belt, when the blade angle fluctuates, accurate positioning of the blade angle position cannot be performed, the aluminum sheet can be used for marking the position reached by the blade angle and the pitch direction, and the conversion of the identification angle can be performed specifically according to the length of the steel belt and the position of the aluminum sheet. Optionally, as shown in fig. 4, the steel strip starts to be stuck on the outer edge surface of the blade root at the blade angle of 0 degree, if 3 aluminum sheets are respectively stuck and placed at the positions of 0 degree, 60 degrees and 90 degrees on the whole steel strip, the identifiable blade angle position is only at the position of 60 degrees; when the blade angle is within 0-60 degrees, the trigger waveform shape is not different and cannot be identified, so that the more the number of aluminum sheets is, the more the blade angle can be identified. Particularly, the variation of the width of the trigger waveform in fig. 4 is larger because the rotation speed of the whole process of pitching is unstable, however, the variation of the rotation speed of pitching does not have larger difference in a small distance because the distance between an aluminum sheet and a steel belt is smaller, and meanwhile, the difference waveform (1, 2 and 3 waveforms in fig. 4) formed by the aluminum sheet-steel belt is taken as the identification characteristic in the whole identification process, the characteristic is relatively fixed, the angular position of the blade is identified through the difference characteristic of the fixed trigger waveform, and the stability and the accuracy of the identification of the angular position of the blade are improved.
In one embodiment, the surface of the first electromagnetic material trigger belt is provided with a plurality of through holes at equal intervals; the pitch state includes: a pitch angle is changed; step 120 may include: step 125 and step 126.
Step 125: determining the quantity of the corresponding wave troughs of the trigger waveforms at the positions of the through holes based on the characteristics of the trigger waveform signals; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero;
step 126: determining the quotient of 90 DEG and the sum of the wave crest number and the wave trough number as the identification precision of the pitch angle; wherein the number of peaks is determined based on the number of valleys.
Illustratively, the accuracy of identification of pitch angle may be: the pitch process changes angle every time it passes through a hole. The length of the steel belt covers the whole range of 0-90 degrees of variable pitch, the diameters of blade roots of blades of different types are different, the length of the steel belt is also different, the steel belt can be customized according to actual conditions, the steel belt starts to be stuck to the outer edge surface of the blade root at the position of 0 degree of the blade angle, and holes are formed in the steel belt in the range of 90 degrees at equal intervals. Because wave peaks are generated at the positions of the steel belt and the aluminum sheet, the eddy current sensor is not triggered at the position of the hole, and no voltage signal is output, the amplitude corresponding to the wave trough of the triggering waveform at the position of the hole is zero. The purpose of the opening holes on the steel belt is to identify the pitch angle and the pitch rotating speed, and the pitch speed and the pitch angle can be identified by utilizing the number of wave troughs and wave crests of the trigger waveform; the length of the steel belt can be customized according to the diameter of the outer edge of the blade root, the total length is equal to the length of the outer circle of the blade root by 90 degrees, the length S=pi D/4, D is the diameter of the outer circle of the blade root, and the length of the steel belt and the number of the holes can be correspondingly changed and adjusted according to different types and different identification precision (pitch angle identification precision).
Alternatively, the length of the steel strip in fig. 4 is equal to the 90 deg. outer circle length of the blade root; the steel belt is uniformly provided with 12 through holes, and the distances between the holes are equal (s1=s2); three aluminum sheets are stuck on three different positions of the steel belt; s1=s2=. The term "sn, n=s+1, n is the number of steel strips equally divided by holes, then pitch angle recognition accuracy is: 90 DEG/n. Based on the characteristics of the trigger waveform signals in fig. 4, the peaks and troughs of the trigger waveforms corresponding to the 12 through hole steel bands can be determined: s1, s2.. wherein, s2, s4, s6..s24 is the trough of the holes corresponding to the holes, the amplitude is zero, the corresponding blade angle is 3.6 degrees (90 degrees/25=3.6 degrees), namely the steel belt with the model has the blade angle identification precision of 3.6 degrees. If the hole size is reduced, the number of holes is increased, the pitch angle identification accuracy is smaller, and under the condition that the length of the steel belt is fixed, the blade angle identification accuracy depends on the number of holes, and the more the number of holes, the higher the identification accuracy. Through fixed trompil on the steel band, and then can confirm the angle of changing the oar according to the trough of trigger wave form, crest number, improved the discernment accuracy and the stability of changing the oar angle.
In one embodiment, the surface of the first electromagnetic material trigger belt is provided with a plurality of through holes at equal intervals; the pitch state includes: the rotating speed of the variable pitch;
Step 120 may include: step 127, step 128 and step 129.
Step 127: determining the trough length and duration of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signal; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero;
step 128: calculating the average rotating speed of each section length in a segmented manner according to the length of each trough, the length and the duration of each wave crest; wherein the peak length is determined based on the trough length;
step 129: and (5) carrying out connection treatment on the average rotating speed to obtain the variable pitch rotating speed.
Illustratively, as shown in fig. 4, the length of the steel strip is equal to the length of the 90 ° outer edge of the blade root, and the length is: s=pi D/4, D is the diameter of the root outer circle, 12 through holes are uniformly distributed on the steel strip, the parameters of the steel strip are known, s1=s2=. According to the characteristics of the trigger waveform signals in fig. 4, the peaks and the troughs of the trigger waveforms corresponding to the 12 through hole steel bands can be determined: s1, s2, s24, wherein s2, s4, s6, s24 are the valleys corresponding to the holes and the amplitude is zero. In the triggered waveform, each segment of hole pitch corresponds to a duration of time: t1=t2=. Therefore, the pitch rotation speed can be calculated in a segmented manner, the pitch process is equally divided into n short-distance pitch processes, and the rotation speed within each equal distance is approximately regarded as small in rotation speed change, so that the average rotation speed within the period of time in the embodiment of fig. 4 is: v1=s1/t 1, v2=s2/t 2, v3=s3/t 3,..v24=s24/t 24, v25=s25/t 25;
And adding the average rotating speeds of each section to obtain the variable pitch rotating speed of the whole variable pitch process. Although in practice there is a difference between the average speed and the true speed, as long as the number of holes s is greater, the identified speed is approximately close to the true pitch speed. Through fixed trompil on the steel band, and then can be according to trigger area length, hole distance, trigger wave form's trough, crest number confirm become oar rotational speed, improved the discernment accuracy and the stability of becoming oar rotational speed.
In one embodiment, a first electromagnetic material trigger strip comprises: stainless steel strip; the second sheet of electromagnetic material comprises: an aluminum sheet.
The material of the first electromagnetic material trigger belt may be various metal materials such as gold, silver, aluminum, iron, etc., and may also be various magnetic materials such as stainless steel, ferromagnetic, etc. The second electromagnetic material sheet may be made of various metal materials such as gold, silver, aluminum, iron, etc., or various magnetic materials such as stainless steel, ferromagnetic, etc. Because the amplitude difference of the triggering waveforms of the eddy current sensor can be manufactured, or the displacement waveforms with the difference characteristics can be manufactured, the pitch direction can be identified according to the amplitude difference, or the angle position of the blade can be identified according to the displacement waveforms with the difference characteristics, the first electromagnetic material triggering belt can be selected as the stainless steel belt with good ductility and good eddy current effect, and the second electromagnetic material sheet can be selected as the aluminum sheet with great difference of magnetic permeability and low cost and difficult weathering with the stainless steel belt.
In one embodiment, the probe size of the eddy current sensor is positively correlated with the accuracy of identification of the pitch angle.
Illustratively, in the case of a certain length of the stainless steel belt, the blade angle recognition accuracy depends on the number of holes, and the more the number of holes, the higher the recognition accuracy. The size of the stainless steel band opening hole is related to the size of the front end probe of the corresponding installed eddy current sensor, and the eddy current sensor has a requirement on the size of the triggering surface. The probe size of the eddy current sensor is the key size of the pitch angle identification precision, the probe size of the eddy current sensor is positively correlated with the pitch angle identification precision, and the smaller the probe size is, the smaller the pitch angle identification precision is. Through setting up the electric vortex sensor of suitable probe size, and then steerable pitch angle's recognition accuracy has improved pitch angle's recognition accuracy.
Referring to fig. 5, fig. 5 is a schematic block diagram of a monitoring device according to an embodiment of the present application. The apparatus includes: a first electromagnetic material trigger strip 210, an eddy current sensor 220, and a controller 230; the first electromagnetic material triggering belt is arranged at the outer edge of the blade root of the fan blade and at least covers one quarter of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt;
The controller 230 is configured to: acquiring a trigger waveform signal generated by the eddy current sensor through the first electromagnetic material;
the controller 230 is further configured to: and identifying the pitch state of the fan pitch system based on the trigger waveform signal.
Optionally, the monitoring device further comprises: a second sheet of electromagnetic material; the surface of the first electromagnetic material trigger belt is provided with a second electromagnetic material sheet, and the magnetic permeability of the first electromagnetic material trigger belt is inconsistent with that of the second electromagnetic material sheet;
the controller is used for: determining trigger waveform amplitude values corresponding to the setting positions of the first electromagnetic material trigger band and the second electromagnetic material sheet based on the characteristics of the trigger waveform signals; wherein the trigger waveform amplitude comprises: a first differential amplitude near the head end and a second differential amplitude far from the head end;
the controller 230 is further configured to: if the first difference amplitude is larger than the second difference amplitude, identifying that the pitch direction of the fan pitch system is a pitch;
the controller 230 is further configured to: and if the first difference amplitude is smaller than the second difference amplitude, identifying that the pitch direction of the fan pitch system is feathering.
Optionally, the first electromagnetic material trigger belt surface is provided with a plurality of second electromagnetic material sheets; the pitch state further comprises: blade angular position;
the controller 230 is further configured to: and determining the blade angle position corresponding to the setting position of the first electromagnetic material trigger belt and the second electromagnetic material sheet based on the trigger waveform amplitude of the trigger waveform signal.
Optionally, the surface of the first electromagnetic material trigger belt is provided with a plurality of through holes at equal intervals; the pitch state includes: a pitch angle is changed;
the controller 230 is further configured to: determining the quantity of the trough of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signal; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero;
determining the quotient of 90 DEG, the number of wave crests and the sum of the number of wave troughs as the identification precision of the pitch angle; wherein the number of peaks is determined based on the number of valleys.
Optionally, the surface of the first electromagnetic material trigger belt is provided with a plurality of through holes at equal intervals; the pitch state includes: the rotating speed of the variable pitch;
the controller 230 is further configured to: determining the trough length and duration of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signals; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero;
Calculating the average rotating speed of each section length in a segmented manner according to each trough length, each crest length and the duration; wherein the peak length is determined based on the wavelength;
and carrying out connection processing on the average rotating speed to obtain the variable pitch rotating speed.
Optionally, the first electromagnetic material trigger band comprises: stainless steel strip; the second sheet of electromagnetic material comprises: an aluminum sheet.
Optionally, the probe size of the eddy current sensor is positively correlated with the accuracy of pitch angle identification.
Referring to fig. 6, fig. 6 is a block schematic diagram of an electronic device. The electronic device 300 may include a memory 311, a memory controller 312, a processor 313, a peripheral interface 314, an input output unit 315, a display unit 316. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 6 is merely illustrative and is not limiting of the configuration of the electronic device 300. For example, electronic device 300 may also include more or fewer components than shown in FIG. 6, or have a different configuration than shown in FIG. 6.
The above-mentioned memory 311, memory controller 312, processor 313, peripheral interface 314, input/output unit 315, and display unit 316 are electrically connected directly or indirectly to each other to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The processor 313 is used to execute executable modules stored in the memory.
The Memory 311 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc. The memory 311 is configured to store a program, and the processor 313 executes the program after receiving an execution instruction, and a method executed by the electronic device 300 defined by the process disclosed in any embodiment of the present application may be applied to the processor 313 or implemented by the processor 313.
The processor 313 may be an integrated circuit chip having signal processing capabilities. The processor 313 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (digital signal processor, DSP for short), application specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 314 couples various input/output devices to the processor 313 and the memory 311. In some embodiments, the peripheral interface 314, the processor 313, and the memory controller 312 may be implemented in a single chip. In other examples, they may be implemented by separate chips.
The input/output unit 315 is used for providing input data to a user. The input/output unit 315 may be, but is not limited to, a mouse, a keyboard, and the like.
The display unit 316 provides an interactive interface (e.g., a user interface) between the electronic device 300 and a user for reference. In this embodiment, the display unit 316 may be a liquid crystal display or a touch display. The liquid crystal display or the touch display may display a process of executing the program by the processor.
The electronic device 300 in the present embodiment may be used to perform each step in each method provided in the embodiments of the present application.
Furthermore, the embodiment of the present application also provides a storage medium, on which a computer program is stored, which when being executed by a processor, performs the steps in the above-mentioned method embodiments.
The computer program product of the above method provided in the embodiments of the present application includes a storage medium storing program codes, where instructions included in the program codes may be used to execute steps in the above method embodiments, and specifically, reference may be made to the above method embodiments, which are not repeated herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
It should be noted that the functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM) random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for monitoring a fan pitch system, the method being applied to a monitoring device for monitoring a fan pitch system, the monitoring device comprising: a first electromagnetic material trigger strip and an eddy current sensor; the first electromagnetic material trigger belt is arranged at the outer edge of the blade root of the fan blade and at least covers one quarter of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt; the method comprises the following steps:
acquiring a trigger waveform signal generated by the eddy current sensor through the first electromagnetic material trigger belt;
and identifying the pitch state of the fan pitch system based on the trigger waveform signal.
2. The method of claim 1, wherein the first electromagnetic material trigger strip surface is provided with a second electromagnetic material sheet, the first electromagnetic material of the first electromagnetic material trigger strip having a magnetic permeability greater than a magnetic permeability of a second electromagnetic material of the second electromagnetic material sheet; the pitch state includes: a pitch direction;
Based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises:
determining trigger waveform amplitude values corresponding to the setting positions of the first electromagnetic material trigger band and the second electromagnetic material sheet based on the characteristics of the trigger waveform signals; wherein the trigger waveform amplitude comprises: a first differential amplitude near the head end and a second differential amplitude far from the head end;
if the first difference amplitude is larger than the second difference amplitude, identifying that the pitch direction of the fan pitch system is a pitch;
and if the first difference amplitude is smaller than the second difference amplitude, identifying that the pitch direction of the fan pitch system is feathering.
3. The method of claim 2, wherein the first electromagnetic material trigger belt surface is provided with a plurality of second electromagnetic material sheets; the pitch state further comprises: blade angular position;
based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises:
and determining the blade angle position corresponding to the setting position of the first electromagnetic material trigger belt and the second electromagnetic material sheet based on the trigger waveform amplitude of the trigger waveform signal.
4. The method of claim 1, wherein the first electromagnetic material trigger strip surface is provided with a plurality of through holes at equal intervals; the pitch state includes: a pitch angle is changed;
based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises:
determining the quantity of the trough of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signal; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero;
determining the quotient of 90 DEG, the number of wave crests and the sum of the number of wave troughs as the identification precision of the pitch angle; wherein the number of peaks is determined based on the number of valleys.
5. The method of claim 1, wherein the first electromagnetic material trigger strip surface is provided with a plurality of through holes at equal intervals; the pitch state includes: the rotating speed of the variable pitch;
based on the trigger waveform signal, identifying a pitch state of a fan pitch system comprises:
determining the trough length and duration of the corresponding trigger waveform at the position of the through hole based on the characteristics of the trigger waveform signals; the amplitude corresponding to the triggering waveform trough at the position of the through hole is zero;
Calculating the average rotating speed of each section length in a segmented manner according to each trough length, each crest length and the duration; wherein the peak length is determined based on the trough length;
and carrying out connection processing on the average rotating speed to obtain the variable pitch rotating speed.
6. The method of any of claims 1-5, wherein the first electromagnetic material trigger strip comprises: stainless steel strip; the second sheet of electromagnetic material comprises: an aluminum sheet.
7. The method of any of claims 1-5, wherein a probe size of the eddy current sensor is positively correlated with an accuracy of pitch angle identification.
8. A monitoring device for monitoring a fan pitch system, the monitoring device comprising: a first electromagnetic material trigger belt, an eddy current sensor and a controller; the first electromagnetic material trigger belt is arranged at the outer edge of the blade root of the fan blade and at least covers one quarter of the outer diameter of the blade root; the electric vortex sensor is fixedly arranged at a wheel hub position corresponding to the head end of the first electromagnetic material trigger belt;
the controller is used for: acquiring a trigger waveform signal generated by the eddy current sensor through the first electromagnetic material;
The controller is further configured to: and identifying the pitch state of the fan pitch system based on the trigger waveform signal.
9. The apparatus of claim 8, wherein the monitoring apparatus further comprises: a second sheet of electromagnetic material; the surface of the first electromagnetic material trigger belt is provided with a second electromagnetic material sheet, and the magnetic permeability of the first electromagnetic material trigger belt is inconsistent with that of the second electromagnetic material sheet;
the controller is used for: determining trigger waveform amplitude values corresponding to the setting positions of the first electromagnetic material trigger band and the second electromagnetic material sheet based on the characteristics of the trigger waveform signals; wherein the trigger waveform amplitude comprises: a first differential amplitude near the head end and a second differential amplitude far from the head end;
the controller is further configured to: if the first difference amplitude is larger than the second difference amplitude, identifying that the pitch direction of the fan pitch system is a pitch;
the controller is further configured to: and if the first difference amplitude is smaller than the second difference amplitude, identifying that the pitch direction of the fan pitch system is feathering.
10. A storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any of claims 1 to 7.
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| CN202410129789.4A CN117685179B (en) | 2024-01-31 | Fan variable pitch system monitoring method, monitoring equipment and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410129789.4A CN117685179B (en) | 2024-01-31 | Fan variable pitch system monitoring method, monitoring equipment and storage medium |
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| CN117685179A true CN117685179A (en) | 2024-03-12 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107061338A (en) * | 2017-05-27 | 2017-08-18 | 山东罗泰风机有限公司 | A kind of fan condition real-time monitoring system |
| CN107246357A (en) * | 2017-07-13 | 2017-10-13 | 固安华电天仁控制设备有限公司 | A kind of blade position self-inspection wind turbine pitch system |
| US20180050816A1 (en) * | 2016-08-17 | 2018-02-22 | Pratt & Whitney Canada Corp. | Apparatus and methods for aircraft propeller control |
| CN108005848A (en) * | 2017-11-28 | 2018-05-08 | 山东科技大学 | Suppression wind energy conversion system based on SMA differential pressures feedback waves the intelligent pitch-controlled system of resonance |
| US20210070426A1 (en) * | 2019-09-05 | 2021-03-11 | Pratt & Whitney Canada Corp. | Signal amplification in blade angle position feedback system |
| CN113757049A (en) * | 2021-08-12 | 2021-12-07 | 太原重工股份有限公司 | Blade angle measuring and checking system and method for variable pitch system of wind turbine generator |
| CN116428130A (en) * | 2023-06-13 | 2023-07-14 | 安徽容知日新科技股份有限公司 | Fan variable pitch system monitoring method, monitoring equipment and storage medium |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180050816A1 (en) * | 2016-08-17 | 2018-02-22 | Pratt & Whitney Canada Corp. | Apparatus and methods for aircraft propeller control |
| CN107061338A (en) * | 2017-05-27 | 2017-08-18 | 山东罗泰风机有限公司 | A kind of fan condition real-time monitoring system |
| CN107246357A (en) * | 2017-07-13 | 2017-10-13 | 固安华电天仁控制设备有限公司 | A kind of blade position self-inspection wind turbine pitch system |
| CN108005848A (en) * | 2017-11-28 | 2018-05-08 | 山东科技大学 | Suppression wind energy conversion system based on SMA differential pressures feedback waves the intelligent pitch-controlled system of resonance |
| US20210070426A1 (en) * | 2019-09-05 | 2021-03-11 | Pratt & Whitney Canada Corp. | Signal amplification in blade angle position feedback system |
| CN113757049A (en) * | 2021-08-12 | 2021-12-07 | 太原重工股份有限公司 | Blade angle measuring and checking system and method for variable pitch system of wind turbine generator |
| CN116428130A (en) * | 2023-06-13 | 2023-07-14 | 安徽容知日新科技股份有限公司 | Fan variable pitch system monitoring method, monitoring equipment and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 胡国强: "风力发电机组变桨系统的设计", 机电工程, vol. 29, no. 05, 31 May 2012 (2012-05-31), pages 588 - 592 * |
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