Generator intelligent operation and maintenance state detection method based on data analysis

Abstract

The invention relates to the technical field of data processing, in particular to a generator intelligent operation and maintenance state detection method based on data analysis, which comprises the following steps: monitoring to obtain respective horizontal decomposition curves and vertical decomposition curves of a generator and a helicopter, and obtaining relative acceleration of the helicopter at each moment; eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and the generator thereof, and obtaining a horizontal amplitude modulation curve of the helicopter and the generator thereof; analyzing the frequency period invariance and the amplitude decreasing proportion consistency of the frequency amplitude when the vibration of the helicopter is transmitted to the generator, and obtaining a horizontal denoising decomposition curve of the generator; obtaining a vertical denoising decomposition curve of the generator; and fusing the horizontal denoising decomposition curve and the vertical denoising decomposition curve, and carrying out operation and maintenance state detection on the generator. The invention aims to eliminate the vibration interference of the helicopter on the generator in the operation and maintenance state detection process of the generator and improve the operation and maintenance state detection accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data processing, in particular to a generator intelligent operation and maintenance state detection method based on data analysis. BACKGROUND

[0002] The brushless direct current generator carried in the helicopter is one of the core components of the on-board electrical system, which mainly provides power for the radio or basic instruments and other electrical equipment on the helicopter. The brush of the brushless direct current generator needs to contact and rub with the rotor's current collector ring during the generator operation, and the generated current needs to pass through the brush to the helicopter system, which makes the brush prone to excessive wear and causes the generator output to be interrupted. If it also causes the commutator to spark and produce high-temperature arc, a helicopter fire may occur.

[0003] By analyzing the brush life of the brushless direct current generator, the service life of the brush can be calculated, and the working state of the brush during the service life can be analyzed and evaluated, and the cause of the fault can be analyzed. In this process, the vibration of the generator caused by the eccentricity of the rotor has a great impact on the wear of the brush, so the existing technology often analyzes the brush life by combining the vibration data of the generator with other data. However, in this process, the vibration data of the generator is disturbed by the vibration of the helicopter caused by the cutting of the blades in the air during the movement of the helicopter, which reduces the reliability of the brush life analysis. SUMMARY

[0004] The present application provides a generator intelligent operation and maintenance state detection method based on data analysis to solve the existing problems.

[0005] The generator intelligent operation and maintenance state detection method based on data analysis of the present application adopts the following technical scheme: One embodiment of the present application provides a generator intelligent operation and maintenance state detection method based on data analysis, which comprises the following steps: Monitoring the running vibration state of the helicopter and its generator to obtain the horizontal and vertical decomposition curves of the generator and the helicopter respectively, and obtaining the relative acceleration of the helicopter at each time; Eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and its generator to obtain the horizontal amplitude modulation curve of the helicopter and its generator; After frequency spectrum decomposition of the horizontal amplitude modulation curve of the helicopter and its generator, analyzing the frequency periodicity invariance and the consistent amplitude reduction ratio of the frequency amplitude when the helicopter vibration is transmitted to the generator to obtain the horizontal denoising decomposition curve of the generator; Using the method for obtaining the horizontal denoising decomposition curve to obtain the vertical denoising decomposition curve of the generator; and fusing the horizontal denoising decomposition curve and the vertical denoising decomposition curve to detect the operation and maintenance state of the generator.

[0006] Preferably, the method for obtaining the horizontal and vertical decomposition curves of the generator and the helicopter respectively comprises: obtaining vibration data of the generator at each time point; obtaining vibration data of the helicopter at each time point; the horizontal direction and the vertical direction constitute a rotating plane coordinate system; projecting the vibration data of the generator at each time point onto the horizontal direction of the rotating plane coordinate system to obtain horizontal vibration data of the generator at each time point; arranging the horizontal vibration data of the generator at all time points in time sequence to obtain the horizontal decomposition curve of the generator; projecting the vibration data of the generator at each time point onto the vertical direction of the rotating plane coordinate system to obtain vertical vibration data of the generator at each time point; arranging the vertical vibration data of the generator at all time points in time sequence to obtain the vertical decomposition curve of the generator; obtaining the horizontal and vertical decomposition curves of the helicopter according to the method for obtaining the horizontal and vertical decomposition curves of the generator.

[0007] Preferably, the method for eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and the generator of the helicopter to obtain the horizontal amplitude modulation curve of the helicopter and the generator of the helicopter comprises: the difference between the horizontal vibration data at each time point and the next time point in the horizontal decomposition curve of the generator is recorded as the horizontal vibration increment at each time point in the horizontal decomposition curve of the generator; obtaining the horizontal corrected vibration data of the generator at each time point and the next time point by using the relative acceleration at each time point and combining the horizontal vibration data and the horizontal vibration increment at the same time point in the horizontal decomposition curve of the generator; obtaining the horizontal corrected vibration data of the generator at each time point according to the method for obtaining the horizontal corrected vibration data of the generator at each time point and the next time point; the horizontal corrected vibration data of the generator at all time points constitute the horizontal amplitude modulation curve of the generator; obtaining the horizontal amplitude modulation curve of the helicopter according to the method for obtaining the horizontal amplitude modulation curve of the generator.

[0008] Preferably, the specific steps of the horizontal corrected vibration data comprise: projecting the relative acceleration at each time point onto the horizontal direction to obtain the horizontal relative acceleration at each time point; obtaining the correction increment at the next time point of each time point in the horizontal decomposition curve of the generator, the correction increment being in a positive proportional relationship with the horizontal vibration increment at each time point and the horizontal relative acceleration at each time point. The horizontal decomposition curve of the generator is obtained by adding the horizontal vibration data at each time to the modified amplitude at the next time of each time, as the horizontal modified vibration data of the generator at the next time of each time.

[0009] Preferably, after the horizontal amplitude modulation curve of the helicopter and the generator is spectrally decomposed, the frequency period invariance and the consistent amplitude reduction ratio of the helicopter vibration transmitted to the generator are analyzed to obtain the horizontal denoising decomposition curve of the generator, including: The horizontal amplitude reduction curve of the helicopter and the horizontal amplitude reduction curve of the generator are respectively Fourier transformed to obtain the spectrum of the horizontal amplitude reduction curve of the helicopter and the spectrum of the horizontal amplitude reduction curve of the generator. The frequencies that appear in the spectrum of the horizontal amplitude reduction curve of the helicopter and the spectrum of the horizontal amplitude reduction curve of the generator at the same time are recorded as the same period frequencies of the horizontal amplitude reduction curve. According to all the same period frequencies of the horizontal amplitude reduction curve, the same proportion amplitude reduction frequency proportion of each same period frequency of the horizontal amplitude reduction curve is obtained. The same proportion amplitude reduction difference of all the same period frequencies about the target same period frequency in the spectrum of the horizontal amplitude reduction curve of the generator is arranged in ascending order to obtain the amplitude difference ascending sequence of the target same period frequency. The absolute value of the difference between each sequence and the next sequence in the amplitude difference ascending sequence of the target same period frequency is recorded as the division coefficient of each sequence in the amplitude difference ascending sequence of the target same period frequency. The sequence with the largest division coefficient is recorded as the division node sequence, and all the same frequency periods from the first sequence to the division node sequence in the amplitude difference ascending sequence of the target same period frequency are recorded as the equal proportion amplitude reduction frequency of the target same period frequency. The ratio of the number of the equal proportion amplitude reduction frequency of the target same period frequency to the number of all the same period frequencies is recorded as the same proportion amplitude reduction frequency proportion of the target same period frequency in the spectrum of the horizontal amplitude reduction curve of the generator. The same proportion amplitude reduction frequency proportion is used to screen the same period frequencies to obtain the interference frequency of the horizontal amplitude reduction curve. After all the interference frequencies are screened out in the spectrum of the horizontal amplitude reduction curve of the generator, the inverse Fourier transform is performed to obtain the horizontal denoising decomposition curve of the generator.

[0010] Preferably, according to all the same period frequencies of the horizontal amplitude reduction curve, the same proportion amplitude reduction frequency proportion of each same period frequency of the horizontal amplitude reduction curve is obtained, including: Any one same period frequency is recorded as the target same period frequency. The ratio of the amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the helicopter to the amplitude of the same-period frequency in the spectrum of the horizontal amplitude curve of the generator is recorded as the amplitude reduction ratio of each same-period frequency; The amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the helicopter is reduced by using the amplitude reduction ratio of the target same-period frequency, and the amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the helicopter after the reduction is obtained as the amplitude reduction amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the helicopter relative to the target same-period frequency. The proportion of the same-period frequency reduction of the target same-period frequency is obtained according to the difference between the amplitude reduction amplitude and the amplitude of the same same-period frequency in the spectrum of the horizontal amplitude curve of the generator.

[0011] Preferably, the specific steps of the amplitude reduction amplitude include: The product of the amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the helicopter except the target same-period frequency and the amplitude reduction ratio of the target same-period frequency is recorded as the amplitude reduction amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the helicopter relative to the target same-period frequency.

[0012] Preferably, the specific steps of obtaining the proportion of the same-period frequency reduction of the target same-period frequency according to the difference between the amplitude reduction amplitude and the amplitude of the same same-period frequency in the spectrum of the horizontal amplitude curve of the generator include: The absolute value of the difference between the amplitude of each same-period frequency in the spectrum of the horizontal amplitude curve of the generator except the target same-period frequency and the amplitude reduction amplitude of the same-period frequency relative to the target same-period frequency is recorded as the same-period frequency reduction difference of each same-period frequency relative to the target same-period frequency in the spectrum of the horizontal amplitude curve of the generator. The proportion of the same-period frequency reduction of the target same-period frequency in the spectrum of the horizontal amplitude curve of the generator is obtained according to the same-period frequency reduction difference of all same-period frequencies relative to the target same-period frequency in the spectrum of the horizontal amplitude curve of the generator.

[0013] Preferably, the specific steps of obtaining the proportion of the same-period frequency reduction of the target same-period frequency according to the same-period frequency reduction difference of all same-period frequencies relative to the target same-period frequency in the spectrum of the horizontal amplitude curve of the generator include: The same-period frequency reduction difference of all same-period frequencies relative to the target same-period frequency in the spectrum of the horizontal amplitude curve of the generator is arranged in ascending order to obtain an ascending sequence of the same-period frequency reduction difference of the target same-period frequency. The absolute value of the difference between each sequence and the next sequence in the ascending sequence of the same-period frequency reduction difference of the target same-period frequency is recorded as the division coefficient of each sequence in the ascending sequence of the same-period frequency reduction difference of the target same-period frequency. The sequence with the largest division coefficient is recorded as a division node sequence, and all the same frequency periods in the target same period frequency difference sequence in ascending order are recorded as the same proportion of the target same period frequency. The ratio of the number of the same proportion of the target same period frequency to the number of all the same period frequencies in the frequency spectrum of the horizontal amplitude curve of the generator is recorded as the proportion of the same proportion of the target same period frequency in the frequency spectrum of the horizontal amplitude curve of the generator.

[0014] Preferably, the specific steps of the interference frequency include: A preset interference screening threshold is set, and if the proportion of the same proportion of the target same period frequency in the frequency spectrum of the horizontal amplitude curve of the generator is greater than the interference screening threshold, the target same period frequency is recorded as an interference frequency, and all the interference frequencies of the horizontal amplitude curve are obtained.

[0015] The beneficial effects of the technical scheme of the present application are: the present application obtains the horizontal and vertical decomposition curves of the generator and the helicopter respectively by monitoring the running vibration state of the helicopter and the generator, and obtains the relative acceleration of the helicopter at each moment; by decomposing the vibration data of the helicopter and the generator into mutually independent horizontal and vertical decomposition curves, the high-dimensional data is reduced, and the operation difficulty is reduced; the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and the generator is eliminated, and the horizontal amplitude curve of the helicopter and the generator is obtained; by analyzing the influence of the acceleration of the helicopter in motion on the vibration of the generator, the real vibration data of the generator is restored, and the influence of the vibration monitoring of the generator under the conditions of overweight and weightlessness is avoided; after the horizontal amplitude curve of the helicopter and the generator is decomposed by spectrum, the frequency period invariance and the amplitude reduction proportion consistency of the frequency when the helicopter vibration is transmitted to the generator are analyzed, and the horizontal denoising decomposition curve of the generator is obtained; by analyzing the characteristics of consistent kinetic energy loss and frequency invariance when the helicopter vibration is transmitted to the generator, the denoising decomposition curve of the generator is obtained by analyzing the frequency period invariance and the amplitude reduction proportion consistency, so that the frequency belonging to the helicopter vibration transmission in the vibration data of the generator is eliminated; the vertical denoising decomposition curve of the generator is obtained by using the method of obtaining the horizontal denoising decomposition curve; the horizontal denoising decomposition curve and the vertical denoising decomposition curve are fused to detect the operation and maintenance state of the generator. The purpose of eliminating the vibration interference of the helicopter on the generator in the operation and maintenance state detection process of the generator and improving the accuracy of the operation and maintenance state detection is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 The step flow chart of the generator intelligent operation and maintenance state detection method based on data analysis of the present application. DETAILED DESCRIPTION

[0018] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following will combine the drawings and the preferred embodiments to specifically describe the generator intelligent operation and maintenance state detection method based on data analysis according to the present application, its specific implementation, structure, features and effects in detail. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0020] The specific scheme of the generator intelligent operation and maintenance state detection method based on data analysis provided by the present application will be specifically described below in combination with the drawings.

[0021] Please refer to Figure 1 which shows the step flow chart of the generator intelligent operation and maintenance state detection method based on data analysis provided by one embodiment of the present application, which includes the following steps: Step S001, monitor the running vibration state of the helicopter and its generator, obtain the horizontal and vertical decomposition curves of the generator and the helicopter respectively, and obtain the relative acceleration of the helicopter at each time.

[0022] It should be noted that when the vibration data is used for operation and maintenance state detection, the vibration data can reflect the collision and friction between the generator rotor and the brush and the stator during the power generation process. When the rotor is eccentric, more collision and friction will occur to the brush in a certain direction, which will further cause the excessive wear of the brush on that side. Therefore, the vibration data has great reference for the operation and maintenance state detection of the generator. Therefore, the vibration data of the generator during the flight of the helicopter needs to be obtained.

[0023] It is further needed to be explained that the helicopter generates lift by cutting air with the blades, in this process the blades and the main engine connected with the blades will generate vibration, which makes the helicopter as a whole have vibration performance, the overall vibration performance is transmitted to the generator through the connecting device of the generator, resulting in the vibration data of the generator being disturbed by the vibration of the helicopter as a whole, so it is necessary to collect the vibration data of the helicopter in flight.

[0024] It is needed to be explained that since the brush is attached to the rotor slip ring and generates wear by rubbing with the rotor, when vibration monitoring and analysis is carried out, the movement of the rotor in the axial direction is not considered, only the vibration of the rotor in its rotation plane is considered; therefore, in this embodiment, the plane of the rotor when rotating clockwise is taken as the rotation plane, the direction vertically upward in the rotation plane is taken as the vertical direction, and the direction 90 degrees clockwise to the vertical direction in the rotation plane is taken as the horizontal direction.

[0025] Specifically, a vibration sensor is installed on the upper surface of the generator in the vertical direction to monitor and obtain the vibration data of the generator at each moment; The vibration data of the helicopter at each moment is obtained through the vibration sensor of the helicopter.

[0026] It is needed to be explained that the vibration sensor of the helicopter is installed on the main structure of the helicopter, since the vibration data of the helicopter as a whole is needed to be obtained, and the overall vibration data is consistent everywhere in the helicopter, therefore the installation position of the vibration sensor on the helicopter is not specifically limited in this embodiment.

[0027] It is particularly needed to be explained that the moment of collecting vibration data in this embodiment needs to be obtained according to the blades of the helicopter, and the vibration performance generated by the blades cutting air should be obtained as much as possible; as an example, for a helicopter with a blade rotating speed of 480 revolutions per minute (RPM), the moment of obtaining vibration data is 80 Hz, so that 10 vibration data can be obtained every time the blade rotates one revolution.

[0028] Further, the vibration of the generator and the helicopter in the horizontal direction and the vertical direction is vibration around the 0 amplitude point of each, that is, the vibration of the generator and the helicopter in the horizontal direction and the vertical direction is independent of each other, therefore the vibration data of the helicopter and the generator is respectively horizontally decomposed and vertically decomposed in this embodiment.

[0029] Preferably, the specific steps of decomposing the vibration data of the generator and the helicopter at each moment to obtain the horizontal decomposition curve and the vertical decomposition curve of the generator and the helicopter respectively are: The horizontal direction and the vertical direction constitute a rotation plane coordinate system; wherein the x-axis is the horizontal direction, and the y-axis is the vertical direction; Projecting the vibration data of the generator at each time onto the horizontal direction of the rotating plane coordinate system obtains the horizontal vibration data of the generator at each time; Arranging the horizontal vibration data of the generator at all times in time sequence obtains the horizontal decomposition curve of the generator; Projecting the vibration data of the generator at each time onto the vertical direction of the rotating plane coordinate system obtains the vertical vibration data of the generator at each time; Arranging the vertical vibration data of the generator at all times in time sequence obtains the vertical decomposition curve of the generator; According to the method for obtaining the horizontal decomposition curve and the vertical decomposition curve of the generator, the horizontal decomposition curve and the vertical decomposition curve of the helicopter are obtained.

[0030] Further, the acceleration and the acceleration direction of the helicopter at each time are obtained through the gyroscope of the helicopter, the unit of the acceleration is ; It is required to be explained that the position of the helicopter when the spatial position of the helicopter is stationary is taken as the origin, and the direction of the helicopter when the helicopter is moving is projected onto the rotating plane, which is recorded as the acceleration direction of the helicopter at each time. Further, the acceleration maximum and minimum range of the helicopter is preset to to The normalized value of the acceleration at each time is obtained by using the acceleration maximum and minimum range; the normalized value of the acceleration is taken as the modulus, and the acceleration direction at the same time is taken as the vector direction, to construct the relative acceleration of the helicopter at each time, and the relative acceleration is a vector.

[0031] Step S002, eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and the generator thereof, to obtain the horizontal amplitude modulation curve of the helicopter and the generator thereof.

[0032] Since the rotor of the generator needs to rotate relative to the stator, there is a certain clearance between the rotor and the stator, and if there is an abnormality in the movement of the rotor, the rotor will not only have rotational movement, but also have vibration in an indefinite direction, the amplitude of the vibration is the size of the clearance, and if the rotor hits and wears the brush, it will cause the vibration of the whole generator, therefore, the brush life can be effectively analyzed by monitoring the vibration of the generator.

[0033] Because the helicopter will exist including the ascending and descending in the acceleration and deceleration when the flight movement, makes the rotor and the generator vibration not only need to resist the earth gravity, also need to resist the acceleration when the acceleration and deceleration bring;And vibration is irregular reciprocating motion, therefore the amplitude of vibration is divided into ascending stage and descending stage, when the acceleration is positive, the generator and the helicopter bear the gravity including the earth gravity and acceleration gravity, make the ascending stage amplitude weaken, when the acceleration is negative, the earth gravity and acceleration of the generator and the helicopter cancel each other, make the ascending stage amplitude increase, and the descending stage is contrary, therefore this embodiment takes the horizontal decomposition curve as an example, through the analysis of the acceleration and the amplitude of vibration data at each moment, eliminate the influence of acceleration on the horizontal decomposition curve, thereby obtain the horizontal amplitude modulation curve.

[0034] Preferably, the specific steps for eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and its generator, and obtaining the horizontal amplitude modulation curve of the helicopter and its generator are as follows: The difference between the horizontal vibration data at each moment and the next moment in the horizontal decomposition curve of the generator is recorded as the horizontal vibration increment at each moment in the horizontal decomposition curve of the generator. The horizontal correction vibration data of the generator at the next moment of each moment is obtained by using the relative acceleration at each moment, combining the horizontal vibration data and the horizontal vibration increment at the same moment in the horizontal decomposition curve of the generator. The horizontal correction vibration data of the generator at each moment is obtained to form the horizontal amplitude modulation curve of the generator. According to the method for obtaining the horizontal amplitude modulation curve of the generator, the horizontal amplitude modulation curve of the helicopter is obtained.

[0035] Specifically, the method for obtaining the horizontal correction vibration data of the generator at the next moment of each moment by using the relative acceleration at each moment, combining the horizontal vibration data and the horizontal vibration increment at the same moment in the horizontal decomposition curve of the generator is as follows: The horizontal relative acceleration at each moment is obtained by projecting the relative acceleration at each moment onto the horizontal direction. The correction increment at the next moment of each moment in the horizontal decomposition curve of the generator is obtained, and the correction increment is in a positive proportional relationship with the horizontal vibration increment at each moment and the horizontal relative acceleration at each moment. The sum of the horizontal vibration data at each moment and the correction increment at the next moment of each moment in the horizontal decomposition curve of the generator is taken as the horizontal correction vibration data of the generator at the next moment of each moment.

[0036] Specifically, as an example, the specific way for obtaining the correction increment at the next moment of each moment in the horizontal decomposition curve of the generator is as follows: The embodiment adds the horizontal relative acceleration of each time to 1 as the incremental correction weight of each time, and the product of the incremental correction weight and the horizontal vibration increment of each time is recorded as the correction amplitude of the next time in the horizontal decomposition curve of the generator. The calculation formula of the example is wherein, is the horizontal relative acceleration of each time, is the incremental correction weight of each time, is the horizontal vibration increment of each time in the horizontal decomposition curve of the generator, is the correction amplitude of the next time of each time in the horizontal decomposition curve of the generator.

[0037] It should be noted that when the incremental correction weight is greater than 1, it indicates that the acceleration is positive, and the generator not only receives the earth gravity but also contains the gravity generated by the positive acceleration, so that the horizontal vibration increment is affected by the increase of the gravity and decreases, and therefore it is necessary to use the incremental correction weight to increase the restored horizontal vibration increment to obtain the correction amplitude; when the incremental correction weight is less than 1, it indicates that the acceleration is negative, and the earth gravity received by the generator and the reverse gravity generated by the negative acceleration cancel each other out, so that the horizontal vibration increment is affected by the decrease of the gravity and increases, and therefore it is necessary to use the incremental correction weight to weaken the restored horizontal vibration increment to obtain the correction amplitude, and when the incremental correction weight is 0, it indicates that the helicopter is in a static state and is not affected by the flight attitude.

[0038] Specifically, the horizontal correction vibration data of the generator at each time is obtained, and the specific method for constructing the horizontal amplitude modulation curve of the generator is as follows: According to the method for obtaining the horizontal correction vibration data of the generator at each time, the horizontal correction vibration data of the generator at each time is obtained; The horizontal correction vibration data of the generator at all times constitutes the horizontal amplitude modulation curve of the generator.

[0039] It should be noted that the horizontal correction vibration data of the next time of each time is obtained based on the horizontal vibration data of each time, rather than the horizontal correction vibration data after each data is corrected.

[0040] Step S003, after the horizontal amplitude modulation curve of the helicopter and its generator is spectrally decomposed, the frequency period invariance and the consistent amplitude reduction ratio of the frequency amplitude when the helicopter vibration is transmitted to the generator are analyzed to obtain the horizontal denoising decomposition curve of the generator.

[0041] It should be noted that when the vibration of the helicopter is transmitted to the generator, the damping facility filters out part of the frequency of the vibration, so if the vibration curve of the generator is disturbed by the vibration of the helicopter, the vibration frequency of the generator will exist in the vibration frequency of the helicopter, and based on the Fourier transform theory, any time sequence curve can be decomposed into several frequencies by Fourier transform, so if the generator is disturbed by the vibration of the helicopter, the frequency of the vibration data of the generator after decomposition contains the vibration frequency of the generator itself and the vibration frequency of the helicopter transmitted to the generator, so after Fourier transform of the vibration data of the generator and the helicopter, if the frequency of the generator contains the frequency of the helicopter, that is, the same curve of the generator and the helicopter has frequency periodicity invariance, it indicates that the generator is disturbed by the vibration of the helicopter.

[0042] Further, since the vibration generated by the cutting of the helicopter blade is transmitted to the generator fixed in the helicopter, there is kinetic energy loss, and the generator in the helicopter is in a soft connection state with the helicopter through the damping facility, so that the overall vibration of the helicopter weakens the vibration interference of the generator. Since the amplitude of the frequency transmitted from the helicopter to the generator attenuates at the same frequency, the more consistent the amplitude of the frequency with frequency periodicity invariance is, the more consistent the amplitude of the frequency is, and the more consistent the amplitude of the frequency is. The frequency is the interference frequency of the helicopter to the generator.

[0043] Preferably, after the horizontal amplitude modulation curve of the helicopter and its generator is spectrally decomposed, the frequency periodicity invariance and the consistency of the amplitude reduction ratio of the frequency when the vibration of the helicopter is transmitted to the generator are analyzed, and the steps of obtaining the horizontal denoising decomposition curve of the generator are as follows: Fourier transform is performed on the horizontal amplitude curve of the helicopter and the horizontal amplitude curve of the generator respectively to obtain the frequency spectrum of the horizontal amplitude curve of the helicopter and the frequency spectrum of the horizontal amplitude curve of the generator; According to the frequency spectrum of the horizontal amplitude curve of the helicopter and the frequency spectrum of the horizontal amplitude curve of the generator, the same period frequency of the horizontal amplitude curve is obtained; According to all the same period frequencies of the horizontal amplitude curve, the same proportion of the amplitude reduction frequency ratio of each same period frequency of the horizontal amplitude curve is obtained; The same proportion of the amplitude reduction frequency ratio is used to screen the same period frequency to obtain the interference frequency of the horizontal amplitude curve; After all the interference frequencies are screened out in the frequency spectrum of the horizontal amplitude curve of the generator, inverse Fourier transform is performed to obtain the horizontal denoising decomposition curve of the generator.

[0044] Specifically, Fourier transform is performed on the horizontal amplitude curve of the helicopter and the horizontal amplitude curve of the generator respectively to obtain the frequency spectrum of the horizontal amplitude curve of the helicopter and the frequency spectrum of the horizontal amplitude curve of the generator, and the frequency spectrum includes several frequencies and the amplitude of each frequency. Further, according to the spectrum diagram of the horizontal amplitude curve of the helicopter and the spectrum diagram of the horizontal amplitude curve of the generator, the specific manner of obtaining the same-period frequency of the horizontal amplitude curve is that the frequency appearing in the spectrum diagram of the horizontal amplitude curve of the helicopter and the spectrum diagram of the horizontal amplitude curve of the generator at the same time is recorded as the same-period frequency of the horizontal amplitude curve.

[0045] Further, according to all the same-period frequencies of the horizontal amplitude curve, the specific steps of obtaining the same-proportion amplitude frequency proportion of each same-period frequency of the horizontal amplitude curve include: obtaining the amplitude reduction proportion of each same-period frequency according to the difference in amplitude of each same-period frequency in the spectrum diagram of the horizontal amplitude curve of the helicopter and in the spectrum diagram of the horizontal amplitude curve of the generator; recording any same-period frequency as a target same-period frequency; after reducing the amplitude of each same-period frequency in the spectrum diagram of the horizontal amplitude curve of the helicopter using the amplitude reduction proportion of the target same-period frequency, obtaining the amplitude reduction amplitude of each same-period frequency in the spectrum diagram of the horizontal amplitude curve of the helicopter relative to the target same-period frequency; obtaining the same-proportion amplitude frequency proportion of the target same-period frequency according to the difference between the amplitude reduction amplitude and the amplitude of the same same-period frequency in the spectrum diagram of the horizontal amplitude curve of the generator.

[0046] Specifically, according to the difference in amplitude of each same-period frequency in the spectrum diagram of the horizontal amplitude curve of the helicopter and in the spectrum diagram of the horizontal amplitude curve of the generator, the calculation manner of obtaining the amplitude reduction proportion of each same-period frequency is: recording the ratio of the amplitude of each same-period frequency in the spectrum diagram of the horizontal amplitude curve of the generator to the amplitude in the spectrum diagram of the horizontal amplitude curve of the helicopter as the amplitude reduction proportion of each same-period frequency; It should be noted that if the amplitude of the same-period frequency in the spectrum diagram of the horizontal amplitude curve of the generator is greater than or equal to the amplitude in the spectrum diagram of the horizontal amplitude curve of the helicopter, it means that the frequency vibration is stronger in the generator, and therefore the generator itself must have the vibration of this frequency regardless of whether the helicopter transmits the vibration to the generator, so the amplitude reduction proportion of the same-period frequency at this time is recorded as 1.

[0047] It should be noted that the amplitude reduction proportion of the same-period frequency is the vibration weakening proportion of each same-period frequency in the generator compared to the helicopter, and if the weakening proportions of other same-period frequencies in the vibration data of the helicopter and the generator are consistent with this proportion, it means that this same-period frequency is more likely to be the vibration transmitted from the helicopter to the generator.

[0048] Therefore, the embodiment obtains the amplitude of the other same period frequency at the target same period frequency in the following manner: the closer the amplitude of the other same period frequency to the amplitude of the same period frequency in the horizontal amplitude curve spectrum of the generator, the more consistent the amplitude reduction ratio of the other same period frequency to the target same period frequency, and the more consistent the amplitude of the other same period frequency and the target same period frequency, and the more likely that the target same period frequency is the frequency of the vibration transmission.

[0049] Further, the amplitude of each other same period frequency in the horizontal amplitude curve spectrum of the helicopter is reduced by using the amplitude reduction ratio of the target same period frequency, and the specific manner of obtaining the amplitude of each other same period frequency about the target same period frequency in the horizontal amplitude curve spectrum of the helicopter is as follows: In the horizontal amplitude curve spectrum of the helicopter, the product of the amplitude of each other same period frequency except the target same period frequency and the amplitude reduction ratio of the target same period frequency is recorded as the amplitude of each other same period frequency about the target same period frequency in the horizontal amplitude curve spectrum of the helicopter. Further, the specific manner of obtaining the same ratio amplitude frequency proportion of the target same period frequency according to the difference between the amplitude and the amplitude of the same period frequency in the horizontal amplitude curve spectrum of the generator is as follows: In the horizontal amplitude curve spectrum of the generator, the absolute value of the difference between the amplitude of each same period frequency except the target same period frequency and the amplitude of the same period frequency about the target same period frequency is recorded as the same ratio amplitude difference of each same period frequency about the target same period frequency in the horizontal amplitude curve spectrum of the generator. According to the same ratio amplitude difference of all same period frequencies about the target same period frequency in the horizontal amplitude curve spectrum of the generator, the same ratio amplitude frequency proportion of the target same period frequency in the horizontal amplitude curve spectrum of the generator is obtained.

[0050] It should be noted that the smaller the same ratio amplitude difference of each same period frequency about the target same period frequency, the more consistent the amplitude reduction ratio of the same period frequency to the target same period frequency, the more consistent the amplitude of the same period frequency and the target same period frequency, and the more likely that the same period frequency and the target same period frequency are the vibration transmission of the helicopter to the generator.

[0051] Specifically, the specific manner of obtaining the same ratio amplitude frequency proportion of the target same period frequency according to the same ratio amplitude difference of all same period frequencies about the target same period frequency in the horizontal amplitude curve spectrum of the generator is as follows: The same ratio amplitude difference of all same period frequencies about the target same period frequency in the horizontal amplitude curve spectrum of the generator is arranged in ascending order to obtain an ascending sequence of the amplitude difference of the target same period frequency. The absolute value of the difference between the proportional amplitude difference of each sequence and the next sequence in the ascending sequence of the target same-period frequency amplitude difference is denoted as the division coefficient of each sequence in the ascending sequence of the target same-period frequency amplitude difference. The sequence with the largest division coefficient is denoted as the division node sequence, and all same-frequency periods from the first sequence to the division node sequence in the ascending sequence of the target same-period frequency amplitude difference are denoted as the same-proportional amplitude frequency of the target same-period frequency. The ratio of the number of the same-proportional amplitude frequency of the target same-period frequency to the number of all same-period frequencies in the frequency spectrum of the horizontal amplitude curve of the generator is denoted as the proportion of the same-proportional amplitude frequency of the target same-period frequency in the horizontal amplitude curve of the generator.

[0052] It should be noted that, since the same-proportional amplitude frequency of the target same-period frequency is approximately proportional to the amplitude ratio of the target same-period frequency, that is, the smaller the same-proportional amplitude difference of the same-proportional amplitude frequency, the smaller the same-proportional amplitude difference. After sorting and polarization division, the part with smaller same-proportional amplitude difference is selected as the same-proportional amplitude frequency of the target same-period frequency to find the part of the same-period frequency that is approximately proportional to the amplitude ratio of the target same-period frequency; at the same time, the more the same-period frequencies that are approximately proportional to the amplitude ratio of the target same-period frequency, the more the frequencies that use the approximate amplitude ratio, that is, these frequencies that use the same approximate amplitude ratio are more likely to be caused by vibration transmission in the vibration curve of the generator.

[0053] Further, the specific steps of screening the same-period frequency by using the same-proportional amplitude frequency proportion to obtain the interference frequency of the horizontal amplitude curve are as follows: a preset interference screening threshold is set, and 0.68 is taken as an example in the embodiment. If the proportion of the same-proportional amplitude frequency of the target same-period frequency in the frequency spectrum of the horizontal amplitude curve of the generator is greater than the interference screening threshold, the target same-period frequency is denoted as an interference frequency, and the same applies to obtaining all interference frequencies of the horizontal amplitude curve.

[0054] Further, after screening out all the interference frequencies in the frequency spectrum of the horizontal amplitude curve of the generator, inverse Fourier transform is performed to obtain the horizontal denoising decomposition curve of the generator.

[0055] Step S004, using the method for obtaining the horizontal denoising decomposition curve, a vertical denoising decomposition curve of the generator is obtained; and the horizontal denoising decomposition curve and the vertical denoising decomposition curve are fused to detect the operation and maintenance state of the generator.

[0056] Specifically, the vertical denoising decomposition curve of the generator is obtained by using the method for obtaining the horizontal denoising decomposition curve.

[0057] Further, by reading the power generation of the generator, the generator rotation stroke, temperature, humidity and other data in the flight computer, and combining the horizontal denoising decomposition curve and the vertical denoising decomposition curve, a generator brush life prediction model is constructed to predict the generator brush life and realize the operation and maintenance state detection of the generator.

[0058] Among them, the construction of the generator brush life prediction model is a known technology, as an example, the power generation of the generator, the generator rotation stroke, temperature, humidity and the horizontal denoising decomposition curve and the vertical denoising decomposition curve are taken as a training set and input into a long short-term memory artificial neural network to train a brush life prediction model, wherein the loss function selected during training is a cross-entropy loss function; the model trained by the long short-term memory artificial neural network can predict future trends, and when the real-time monitored data deviates from the predicted data of the brush life prediction model, the generator operation is abnormal.

[0059] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting the intelligent operation and maintenance status of a generator based on data analysis, characterized in that: The method comprises the following steps: Monitor the operating vibration status of the helicopter and its generator, obtain the horizontal and vertical decomposition curves of the generator and the helicopter respectively, and obtain the relative acceleration of the helicopter at each moment; Eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and its generator, and obtaining a horizontal amplitude modulation curve of the helicopter and its generator; After performing spectral decomposition on the horizontal amplitude modulation curves of the helicopter and its generator, the frequency period invariance and the proportional consistency of the frequency amplitude reduction when the helicopter vibration is transmitted to the generator are analyzed to obtain the horizontal denoising decomposition curve of the generator. The method for obtaining the horizontal denoising decomposition curve is used to obtain the vertical denoising decomposition curve of the generator; the horizontal denoising decomposition curve and the vertical denoising decomposition curve are integrated to perform operation and maintenance status detection on the generator.

2. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 1 is characterized in that: The obtaining of the horizontal decomposition curve and the vertical decomposition curve of the generator and the helicopter respectively includes: Obtain the vibration data of the generator at each moment; Obtain vibration data of the helicopter at every moment; The horizontal and vertical directions constitute a rotating plane coordinate system; Projecting the vibration data of the generator at each moment onto the horizontal direction of the rotating plane coordinate system to obtain the horizontal vibration data of the generator at each moment; Arrange the horizontal vibration data of the generator at all times in time sequence to obtain the horizontal decomposition curve of the generator; Projecting the vibration data of the generator at each moment onto the vertical direction of the rotating plane coordinate system to obtain the vertical vibration data of the generator at each moment; Arrange the vertical vibration data of the generator at all times in time sequence to obtain the vertical decomposition curve of the generator; According to the method for obtaining the horizontal decomposition curve and the vertical decomposition curve of the generator, the horizontal decomposition curve and the vertical decomposition curve of the helicopter are obtained.

3. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 1 is characterized in that: Eliminating the influence of the relative acceleration on the horizontal decomposition curve of the helicopter and its generator to obtain the horizontal amplitude modulation curve of the helicopter and its generator includes: The difference between the horizontal vibration data at each moment and the next moment in the horizontal decomposition curve of the generator is recorded as the horizontal vibration increment at each moment in the horizontal decomposition curve of the generator; By using the relative acceleration at each moment and combining the horizontal vibration data and the horizontal vibration increment at the same moment in the horizontal decomposition curve of the generator, the horizontal corrected vibration data of the generator at the next moment of each moment is obtained; According to the method of obtaining the horizontal corrected vibration data of the generator at the next moment after each moment, the horizontal corrected vibration data of the generator at each moment is obtained; The horizontally corrected vibration data of the generator at all times constitutes the horizontal amplitude modulation curve of the generator; According to the method for obtaining the horizontal amplitude modulation curve of the generator, the horizontal amplitude modulation curve of the helicopter is obtained.

4. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 3 is characterized in that: The specific steps of horizontally correcting vibration data include: Project the relative acceleration at each moment onto the horizontal direction to obtain the horizontal relative acceleration at each moment; Obtaining a corrected increase in amplitude at each moment in the next moment in the horizontal decomposition curve of the generator, wherein the corrected increase in amplitude is in direct proportion to the horizontal vibration increment at each moment and the horizontal relative acceleration at each moment; The sum of the horizontal vibration data at each moment and the corrected amplitude at the next moment in the horizontal decomposition curve of the generator is used as the horizontal corrected vibration data of the generator at the next moment.

5. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 1 is characterized in that: After performing spectrum decomposition on the horizontal amplitude modulation curve of the helicopter and its generator, the frequency period invariance and the consistency of the frequency amplitude reduction ratio when the helicopter vibration is transmitted to the generator are analyzed, and the horizontal denoising decomposition curve of the generator is obtained, which includes: Performing Fourier transform on the horizontal amplitude drop curve of the helicopter and the horizontal amplitude drop curve of the generator respectively to obtain a frequency spectrum of the horizontal amplitude drop curve of the helicopter and the frequency spectrum of the horizontal amplitude drop curve of the generator; The frequencies that appear simultaneously in the spectrum of the helicopter's horizontal amplitude reduction curve and the spectrum of the generator's horizontal amplitude reduction curve are recorded as the same-period frequencies of the horizontal amplitude reduction curves; According to all the same-period frequencies of the horizontal decrease curve, the same-proportional decrease frequency ratio of each same-period frequency of the horizontal decrease curve is obtained; Arrange the reduction differences of all frequencies with the same period in the frequency spectrum of the horizontal reduction curve of the generator with the same proportion relative to the target frequency with the same period in ascending order to obtain an ascending sequence of the reduction differences of the target frequency with the same period; Obtain the absolute value of the difference between the same-proportional decrease difference of each sequence and the next sequence in the ascending sequence of decrease difference of the target same-cycle frequency, and record it as the division coefficient of each sequence in the ascending sequence of decrease difference of the target same-cycle frequency; The sequence with the largest division coefficient is recorded as the division node sequence, and all the same-frequency periods from the first sequence to the division node sequence in the ascending sequence of the reduction difference of the target same-cycle frequency are recorded as the proportional reduction frequency of the target same-cycle frequency; The ratio of the number of frequencies with equal proportional reduction of the target frequency with the same period to the number of all frequencies with the same period is recorded as the proportion of the frequencies with equal proportional reduction of the target frequency with the same period in the frequency spectrum of the horizontal reduction curve of the generator; Using the same-proportional reduction frequency ratio to filter the same-period frequencies, the interference frequency of the horizontal reduction curve is obtained; After all the interference frequencies are screened out from the frequency spectrum of the horizontal amplitude reduction curve of the generator, an inverse Fourier transform is performed to obtain a horizontal denoising decomposition curve of the generator.

6. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 5 is characterized in that: The step of obtaining the same-proportional reduction frequency ratio of each same-period frequency of the horizontal reduction curve according to all same-period frequencies of the horizontal reduction curve includes: Record any same-period frequency as the target same-period frequency; The ratio of the amplitude of each frequency with the same period in the frequency spectrum of the horizontal amplitude reduction curve of the generator and the frequency spectrum of the horizontal amplitude reduction curve of the helicopter is recorded as the amplitude reduction ratio of each frequency with the same period; After reducing the amplitude of each other co-periodic frequency in the frequency spectrum of the helicopter's horizontal amplitude reduction curve using the reduction ratio of the target co-periodic frequency, the reduction amplitude of each other co-periodic frequency with respect to the target co-periodic frequency in the frequency spectrum of the helicopter's horizontal amplitude reduction curve is obtained; According to the amplitude difference between the reduction amplitude and the amplitude of the same and periodic frequency in the frequency spectrum of the horizontal reduction curve of the generator, the proportion of the frequency of the target same and periodic frequency of the reduction amplitude in the same proportion is obtained.

7. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 6 is characterized in that: The specific steps of reducing the amplitude include: In the frequency spectrum of the helicopter's horizontal amplitude drop curve, the product of the amplitude of each other co-cyclic frequency except the target co-cyclic frequency and the amplitude drop ratio of the target co-cyclic frequency is recorded as the amplitude drop of each other co-cyclic frequency relative to the target co-cyclic frequency in the frequency spectrum of the helicopter's horizontal amplitude drop curve.

8. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 6 is characterized in that: The specific steps of obtaining the proportion of the target same-cycle frequency with the same proportional reduction amplitude according to the difference between the reduction amplitude and the amplitude of the same same-cycle frequency in the spectrum diagram of the horizontal reduction amplitude curve of the generator include: The absolute value of the difference between the amplitude of each frequency with the same cycle except the target frequency with the same cycle in the frequency spectrum of the horizontal amplitude reduction curve of the generator and the amplitude of the reduction of the frequency with the same cycle with respect to the target frequency with the same cycle is recorded as the proportional reduction difference of each frequency with the same cycle with respect to the target frequency with the same cycle in the frequency spectrum of the horizontal amplitude reduction curve of the generator; According to the proportional reduction differences of all same-cycle frequencies with respect to the target same-cycle frequency in the frequency spectrum of the horizontal reduction curve of the generator, the proportion of the target same-cycle frequency with the proportional reduction in the frequency spectrum of the horizontal reduction curve of the generator is obtained.

9. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 8 is characterized in that: The specific steps of obtaining the proportion of the target same-cycle frequency with the same-cycle frequency in the spectrum diagram of the horizontal reduction curve of the generator based on the same-proportional reduction differences of all same-cycle frequencies with respect to the target same-cycle frequency in the spectrum diagram of the horizontal reduction curve of the generator include: Arrange the reduction differences of all frequencies with the same period in the frequency spectrum of the horizontal reduction curve of the generator with the same proportion relative to the target frequency with the same period in ascending order to obtain an ascending sequence of the reduction differences of the target frequency with the same period; Obtain the absolute value of the difference between the same-proportional decrease difference of each sequence and the next sequence in the ascending sequence of decrease difference of the target same-cycle frequency, and record it as the division coefficient of each sequence in the ascending sequence of decrease difference of the target same-cycle frequency; The sequence with the largest division coefficient is recorded as the division node sequence, and all the same-frequency periods from the first sequence to the division node sequence in the ascending sequence of the reduction difference of the target same-cycle frequency are recorded as the proportional reduction frequency of the target same-cycle frequency; The ratio of the number of frequencies with equal proportional reduction of the target same-cycle frequency to the number of all frequencies with the same cycle is recorded as the proportion of the frequencies with equal proportional reduction of the target same-cycle frequency in the spectrum diagram of the horizontal reduction curve of the generator.

10. The method for detecting the intelligent operation and maintenance status of a generator based on data analysis according to claim 5, characterized in that: The specific steps of interfering with the frequency include: The interference screening threshold is preset. If the proportion of the same-proportional reduction frequency of the target same-cycle frequency in the spectrum diagram of the horizontal reduction curve of the generator is greater than the interference screening threshold, the target same-cycle frequency is recorded as an interference frequency, and all interference frequencies of the horizontal reduction curve are obtained.

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