CN111535999B - Fan falling object monitoring method, device and system and storage medium - Google Patents
Fan falling object monitoring method, device and system and storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a fan fallen object monitoring method, a device, a system and a storage medium, which relate to the field of fan working condition monitoring, and the fan fallen object monitoring method comprises the following two steps: acquiring an acoustic signal in a fan hub; and judging whether the fan hub is provided with fallen objects or not according to the kurtosis of the acoustic signal. The corresponding device comprises an acquisition module and a judgment module which are respectively used for executing the two steps. The corresponding system comprises a monitor and a computer, wherein the monitor is used for monitoring the sound signal in the fan hub and sending the sound signal to the computer, and the computer is used for judging whether the fan hub is provided with the fallen object or not according to the kurtosis of the sound signal. An executable program is stored in the corresponding storage medium, and when the executable program is executed, the fan fallen object monitoring method is realized. The fan fallen object monitoring method, the device, the system and the storage medium can effectively improve the reliability of fan fallen object monitoring.
Description
Technical Field
The invention relates to the field of fan working condition monitoring, in particular to a fan falling object monitoring method, device and system and a storage medium.
Background
The fan hub is one of the core components of the fan, and if a falling object occurs in the fan hub, the fan can cause potential safety hazards, and the normal operation of the fan is seriously influenced.
However, the relative technology generally adopts laser correlation and circuit on-off modes to monitor whether the fan hub has fallen objects, and the problem of unreliable monitoring exists.
Disclosure of Invention
The invention aims to provide a fan falling object monitoring method, a device, a system and a storage medium, which can effectively improve the reliability of fan falling object monitoring.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a method for monitoring a fan fallen object, for monitoring whether the fan hub has the fallen object, including:
acquiring an acoustic signal in a fan hub;
and judging whether the fan hub is provided with fallen objects or not according to the kurtosis of the acoustic signal.
With reference to the first aspect, in an optional embodiment, the step of determining whether there is a fallen object in the fan hub according to the kurtosis of the acoustic signal includes:
and when the kurtosis of the acoustic signal is smaller than a first threshold value, judging that no falling object exists in the fan hub.
With reference to the first aspect, in an optional embodiment, the step of determining whether there is a fallen object in the fan hub according to the kurtosis of the acoustic signal includes:
when the kurtosis of the acoustic signal is larger than or equal to a first threshold value, carrying out envelope demodulation processing on the acoustic signal to acquire a time domain diagram of the acoustic signal;
performing Fourier transform on the time domain image to acquire a frequency domain image of the acoustic signal;
the main frequency of the acoustic signal is obtained through the frequency domain graph, and whether a fallen object exists in the fan hub or not is judged according to the ratio of the amplitude of the main frequency or the frequency doubling of the main frequency of the acoustic signal to the total amplitude of the acoustic signal, wherein the main frequency of the acoustic signal is the frequency corresponding to the maximum amplitude in the frequency domain graph, and the total amplitude of the acoustic signal is the square sum of the amplitudes of all the frequencies in the frequency domain graph.
With reference to the first aspect, in an optional embodiment, the step of determining whether there is a fallen object in the fan hub according to a ratio of the amplitude of the dominant frequency or the frequency doubling of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal includes:
and when the ratio of the amplitude of the dominant frequency or the frequency multiplication of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal is greater than or equal to a second threshold value, judging that the fan hub is internally provided with the fallen object.
With reference to the first aspect, in an optional embodiment, the step of determining whether there is a fallen object in the fan hub according to a ratio of the amplitude of the dominant frequency or the frequency doubling of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal includes:
and when the ratio of the amplitude of the dominant frequency or the frequency multiplication of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal is smaller than a second threshold value, judging that no falling object exists in the fan hub.
In an alternative embodiment, in combination with the first aspect, the shedding is a bolt of a fan blade.
In a second aspect, an embodiment of the present invention provides a fan fallen object monitoring device, configured to monitor whether a fallen object exists in a fan hub, where the fan fallen object monitoring device includes an obtaining module and a determining module, where the obtaining module is configured to obtain an acoustic signal in the fan hub, and the determining module is configured to determine whether the fallen object exists in the fan hub according to a kurtosis of the acoustic signal.
In a third aspect, embodiments of the present invention provide a fan fallen object monitoring system, which includes a monitor and a computer in communication with the monitor, wherein the monitor is configured to monitor an acoustic signal in a fan hub, and the computer is configured to determine whether there is a fallen object in the fan hub according to a kurtosis of the acoustic signal.
In combination with the third aspect, in an alternative embodiment, the monitor is a microphone.
In combination with the third aspect, in an alternative embodiment, the monitor includes a microphone electrically connected to the collector, and a collector in communication with the computer.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, in which an executable program is stored, and when the executable program is executed, the method for monitoring fan fallen objects provided in the first aspect is implemented.
The beneficial effects of the embodiment of the invention include, for example:
the fan fallen object monitoring method provided by the embodiment of the invention judges whether the fallen object appears in the fan hub by monitoring the sound signal in the fan hub and analyzing the kurtosis of the sound signal, and because the sound signal has the characteristics of wide propagation range and no dead angle, the sound signal generated by impact can be monitored no matter which part of the fan hub the fallen object falls in, compared with monitoring modes such as laser correlation, circuit on-off and the like in related technologies, the monitoring method can greatly improve the probability of being monitored when the fallen object appears in the fan hub, thereby effectively improving the reliability of fan fallen object monitoring.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a fan-falling object monitoring system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a computer according to an embodiment of the present invention;
fig. 3 is a first flowchart of a fan fallen object monitoring method according to an embodiment of the present invention;
fig. 4 is a second flowchart of a fan fallen object monitoring method according to an embodiment of the present invention;
fig. 5 is a third flowchart of a fan fallen object monitoring method according to an embodiment of the present invention;
fig. 6 is a block diagram of a fan fallen object monitoring device according to an embodiment of the present invention.
Icon: 10-a fan falling object monitoring system; 20-a fan fallen object monitoring device; 100-a computer; 101-a memory; 102-a communication interface; 103-a processor; 104-a bus; 200-a monitor; 300-an acquisition module; 400-a judgment module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention 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 invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
A wind turbine (i.e., a wind power generator) is an electric power device that converts wind energy into mechanical energy, and finally into electric energy. Wind turbines generally include a rotor and a generator, with the rotor including blades, a hub, stiffeners, and the like. The principle of wind turbine power generation is simple, the wind wheel rotates under the action of wind force, the kinetic energy of wind is converted into mechanical energy of a wind wheel shaft, and the generator rotates under the drive of the wind wheel shaft to generate power, so that the mechanical energy of the wind wheel shaft is converted into electric energy and output.
Wherein, wheel hub is one of the core part of fan, in case the abscission thing appears in it, for example fan blade's bolt etc. can cause the damage to its inside relevant structure very likely to cause the potential safety hazard for the fan, seriously influence the normal operating of fan. Therefore, the fan can monitor whether the falling object exists in the fan hub in real time during operation, and if the falling object is monitored, the fan needs to be stopped for checking.
However, in the related art, generally, the laser correlation and the circuit on-off are adopted to monitor whether the fallen objects exist in the fan hub, and the monitoring mode has the problem of unreliable monitoring due to the limitation of the characteristics of the monitoring mode, so that even if the fallen objects exist in the blade hub, the fallen objects can not be easily monitored.
In view of the above situation, embodiments of the present invention provide a method, an apparatus, a system and a storage medium for monitoring fan fallen objects, which can greatly improve the probability of being monitored when the fallen objects appear in a blade hub, thereby effectively improving the reliability of monitoring fan fallen objects and ensuring the normal operation of a fan.
The method, the device, the system and the storage medium for monitoring the fan falling objects are described in detail below with reference to the accompanying drawings, and firstly, the system for monitoring the fan falling objects is described.
Referring to fig. 1, a fan fallen object monitoring system 10 according to an embodiment of the present invention is used for detecting whether a fallen object exists in a fan hub. In detail, the present fan fallout monitoring system 10 includes a monitor 200 and a computer 100 in communication with the monitor 200. The monitor 200 is disposed at any position in the hub of the wind turbine for monitoring the acoustic signal in the hub of the wind turbine. Monitor 200 may take different configurations as desired, so long as it monitors the acoustic signal within the fan hub and converts it to an electrical signal. In this embodiment, the monitor 200 is a microphone (commonly called a "microphone"), and the microphone converts an acoustic signal in the hub of the fan into an electrical signal and transmits the electrical signal to the computer 100. In other embodiments, monitor 200 may also include a sound pickup electrically connected to the collector for picking up the sound signal in the blade hub and transmitting it to the collector, and a collector in communication with computer 100 for receiving the sound signal and converting it into an electrical signal for transmitting it to computer 100. As for the specific number of monitors 200, in actual engineering, since the number of fans is generally plural, in this embodiment, the number of monitors 200 is also plural, and the plurality of monitors 200 may be installed in the hubs of the plurality of fans in a one-to-one correspondence manner. Of course, in other embodiments, the monitoring system may have only one monitor 200, monitoring only one fan hub acoustic signal.
The communication mode between the computer 100 and the monitor 200 can be determined according to the requirement, in this embodiment, the computer 100 and the monitor 200 adopt wired communication, that is, communication is performed through a cable, so as to save cost and ensure communication quality. In other embodiments, the computer 100 and the monitor 200 may communicate wirelessly. The computer 100 is configured to determine whether there is a falling object in the fan hub according to a kurtosis of the acoustic signal after acquiring the acoustic signal in the fan hub. The reliability of monitoring the fan falling objects can be effectively improved by monitoring the sound signals in the fan hub to judge the falling objects in the fan hub.
Referring to fig. 2, the computer 100 according to the embodiment of the present invention may be, but is not limited to, a desktop computer, a notebook computer, a tablet computer, a smart phone, a server, and other computing devices having an arithmetic operation function and a logical operation function. The operating system of the computer 100 may be, but is not limited to, a Windows system, a Linux system, and the like. The computer 100 comprises a memory 101, a communication interface 102, a processor 103 and a bus 104, the memory 101, the communication interface 102 and the processor 103 being connected by the bus 104, the processor 103 being adapted to execute executable modules stored in the memory 101, such as computer 100 programs.
The Memory 101 may include a high-speed Random Access Memory (RAM) and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication link between the computer 100 and the monitor 200 is implemented by at least one communication interface 102 (which may be wired or wireless). The bus 104 may be an ISA bus, PCI bus, EISA bus, or the like. Only one bi-directional arrow is shown in fig. 2, but this does not indicate only one bus 104 or one type of bus 104.
Further, the memory 101 is used for storing a program, such as the fan-shed monitoring device 20 disclosed in fig. 6. The fan drop monitoring device 20 includes at least one software function module which can be stored in the memory 101 in the form of software or firmware (firmware) or is fixed in an Operating System (OS) of the computer 100. After receiving the execution instruction, the processor 103 executes the program to implement the fan falling object monitoring method disclosed in fig. 3.
It should be noted that the fan fallen object monitoring system 10 may be independently installed, or may be integrally installed with other monitoring systems, so as to achieve centralized management and reduce cost.
The above is a description of the fan shed monitoring system 10, and the fan shed monitoring method is described next.
Referring to fig. 3, an embodiment of the invention provides a fan fallen object monitoring method for monitoring whether a fallen object exists in a fan hub. The fan falling object monitoring method comprises the following steps:
step S100: and acquiring acoustic signals in the fan hub. The acoustic signals in the fan hub are monitored by the monitor 200 and converted into electrical signals and transmitted to the computer 100 for the computer 100 to receive and acquire.
Step S200: and judging whether a fallen object exists in the fan hub or not according to the kurtosis of the acoustic signal. The kurtosis is numerical statistic reflecting the analysis characteristics of the acoustic signals, is a normalized 4-order central moment, is particularly sensitive to impact signals generated by impact of a falling object on a fan hub, and is particularly suitable for judging the impact magnitude. Therefore, whether the falling object exists or not can be judged accurately according to the kurtosis of the sound signal.
Further, referring clearly to fig. 4, step S200 specifically includes:
when the kurtosis of the acoustic signal is less than a first threshold, performing step S210: and judging that no falling object exists in the fan hub. The kurtosis of the sound signal is smaller than the first threshold, which indicates that the impact signal monitored in the fan hub is smaller than a certain degree, and no object falls off and impacts the inside of the fan hub, so that the condition that no falling object exists in the fan hub can be directly judged.
The method for calculating the kurtosis of a sound signal is the prior art, and specifically comprises the following formula:
The specific value of the first threshold value may be determined according to the type of the falling object. For example, if the fallen object is a blade bolt of the fan, according to experience, when the blade bolt falls off and impacts the fan hub, the kurtosis of the generated acoustic signal is generally 3 to 4, and therefore the value range of the first threshold value may be 3 to 4 (specifically, 3, 3.5, or 4), that is, when the kurtosis of the acoustic signal monitored in the fan hub is greater than or equal to 3 to 4, it may be determined that the blade bolt falls off from the fan hub.
And when the kurtosis of the sound signal is greater than or equal to a first threshold, it indicates that the impact signal monitored in the fan hub is already strong to a certain degree, and an object is likely to fall off and impact the inside of the fan hub, and further judgment is needed, so the following steps are sequentially executed:
step S220: and carrying out envelope demodulation processing on the acoustic signal to acquire a time domain diagram of the acoustic signal. Namely, envelope demodulation is carried out on the acoustic signal, and the function relation of the amplitude of the acoustic signal and time is obtained.
Step S230: fourier transform the time domain map to obtain a frequency domain map of the acoustic signal. I.e. by transforming the amplitude of the acoustic signal as a function of time to obtain the amplitude of the acoustic signal as a function of frequency.
And step S240: and acquiring the main frequency of the acoustic signal through the frequency domain graph, and judging whether the fan hub is provided with the fallen object or not according to the main frequency of the acoustic signal or the ratio of the amplitude of the frequency multiplication of the main frequency to the total amplitude of the acoustic signal.
And the main frequency of the acoustic signal is the frequency corresponding to the maximum amplitude in the frequency domain graph. For example, if the functional relationship y between the frequency and the amplitude of the acoustic signal is set to f (x), where y is the frequency and x is the amplitude, the main frequency y of the acoustic signal is setMaster and slave＝f(xmax) Wherein x ismaxIs the maximum amplitude.
The total amplitude of the acoustic signal is the square sum of the open roots of the amplitudes of all frequencies in the frequency domain plot. For example, if three frequencies are set, and the amplitudes corresponding to the three frequencies are a, b and c, respectively, the total amplitude of the acoustic signal is determined
The frequency multiplication of the main frequency means an integer multiple of the main frequency, e.g. if the main frequency is yMaster and slaveThe frequency multiplication of the main frequency is 2yMaster and slave、3yMaster and slaveAnd 4yMaster and slaveAnd the like.
Further, referring to fig. 5, the step S240 specifically includes:
when the ratio of the amplitude of the main frequency of the acoustic signal or the frequency multiplication of the main frequency to the total amplitude of the acoustic signal is greater than or equal to a second threshold, executing step S242: and judging that the falling objects exist in the fan hub.
When the ratio of the amplitude of the main frequency of the acoustic signal or the frequency multiplication of the main frequency to the total amplitude of the acoustic signal is smaller than a second threshold, executing step S244: and judging that no falling object exists in the fan hub.
In this embodiment, the second threshold may be 0.5, that is, when a ratio of an amplitude of the dominant frequency of the acoustic signal to a total amplitude of the acoustic signal or a ratio of an amplitude of a frequency doubling of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal is less than 0.5, it may be determined that there is no fallen object in the fan hub, otherwise, if the ratio of the amplitude of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal or the ratio of the amplitude of the frequency doubling of the dominant frequency of the acoustic signal to the total amplitude of the acoustic signal is greater than or equal to 0.5, it may be determined that there is a fallen object in the fan hub. In other embodiments, the second threshold may be other values, such as 0.3, 0.4, 0.6, 0.7, etc.
It should be noted that, before judging whether there is a shedding object in the fan hub through the dominant frequency or the frequency multiplication of the acoustic signal, the dominant frequency or the frequency multiplication of the dominant frequency may be compared with the dominant frequency or the frequency multiplication of the dominant frequency of some inherent acoustic signals to be eliminated, so as to eliminate the interference. For example, if the dominant frequency or the frequency multiplication of the dominant frequency of the acoustic signal is the same as the dominant frequency or the frequency multiplication of the dominant frequency of the acoustic signal emitted by the rotation of the wind wheel of the wind turbine, it indicates that the monitored acoustic signal is actually emitted by the rotation of the wind wheel, and can be directly eliminated without performing demodulation and conversion processing.
The fan fallen object monitoring method provided by the embodiment of the invention judges whether the fallen object appears in the fan hub by monitoring the sound signal in the fan hub and analyzing the kurtosis of the sound signal, and because the sound signal has the characteristics of wide propagation range and no dead angle, the sound signal generated by impact can be monitored no matter which part of the fan hub the fallen object falls on.
The above is the introduction of the fan fallen object detection method, and the corresponding fan fallen object detection device is introduced below.
Referring to fig. 6, a fan fallen object monitoring device 20 according to an embodiment of the present invention is used for monitoring whether a fallen object exists in a fan hub. The fan-falling object monitoring device 20 includes an obtaining module 300 and a judging module 400.
The obtaining module 300 is configured to obtain an acoustic signal in the hub of the wind turbine, and in this embodiment, the obtaining module 300 is configured to execute step S100.
The judging module 400 is configured to judge whether there is a falling object in the fan hub according to the acoustic signal, and in this embodiment, the judging module 400 is configured to execute step S200.
The above is the description of the fan fallen object detection device, and the corresponding storage medium is described below.
The computer-readable storage medium provided by the embodiment of the invention stores the executable program, and when the executable program is executed, the fan fallen object monitoring method can be realized.
The above is an illustrative scheme of a computer-readable storage medium of the present embodiment. It should be noted that the technical solution of the storage medium and the technical solution of the fan-falling object monitoring method belong to the same concept, and details that are not described in detail in the technical solution of the storage medium can be referred to the description of the technical solution of the fan-falling object monitoring method.
Note that the computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
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 invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. It is noted that, herein, 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A fan fallen object monitoring method is used for monitoring whether fallen objects exist in a fan hub or not, and is characterized by comprising the following steps:
acquiring an acoustic signal in the fan hub;
judging whether a fallen object exists in the fan hub according to the kurtosis of the sound signal, wherein the step of judging whether the fallen object exists in the fan hub according to the kurtosis of the sound signal comprises the following steps:
when the kurtosis of the acoustic signal is larger than or equal to a first threshold value, carrying out envelope demodulation processing on the acoustic signal to acquire a time domain diagram of the acoustic signal;
performing Fourier transform on the time domain map to obtain a frequency domain map of the acoustic signal;
acquiring the main frequency of the acoustic signal through the frequency domain graph, and judging whether a shedding object exists in the fan hub according to the ratio of the amplitude of the main frequency of the acoustic signal to the total amplitude of the acoustic signal or the ratio of the amplitude of the frequency multiplication of the main frequency of the acoustic signal to the total amplitude of the acoustic signal, wherein the main frequency of the acoustic signal is the frequency corresponding to the maximum amplitude in the frequency domain graph, and the total amplitude of the acoustic signal is the square sum of the amplitudes of all the frequencies in the frequency domain graph.
2. The fan fallout monitoring method of claim 1, wherein said determining if there is a fallout in said fan hub based on the kurtosis of said acoustic signal comprises:
and when the kurtosis of the acoustic signal is smaller than a first threshold value, judging that no falling object exists in the fan hub.
3. The fan shedding monitoring method according to claim 1, wherein the step of judging whether shedding occurs in the fan hub according to a ratio of the amplitude of the main frequency of the sound signal to the total amplitude of the sound signal or a ratio of the amplitude of the frequency doubling of the main frequency of the sound signal to the total amplitude of the sound signal comprises:
and when the ratio of the amplitude of the main frequency of the acoustic signal to the total amplitude of the acoustic signal or the ratio of the amplitude of the frequency multiplication of the main frequency of the acoustic signal to the total amplitude of the acoustic signal is larger than or equal to a second threshold value, judging that the fan hub is internally provided with the fallen objects.
4. The fan shedding monitoring method according to claim 1, wherein the step of judging whether shedding occurs in the fan hub according to a ratio of the amplitude of the main frequency of the sound signal to the total amplitude of the sound signal or a ratio of the amplitude of the frequency doubling of the main frequency of the sound signal to the total amplitude of the sound signal comprises:
and when the ratio of the amplitude of the main frequency of the acoustic signal to the total amplitude of the acoustic signal or the ratio of the amplitude of the frequency multiplication of the main frequency of the acoustic signal to the total amplitude of the acoustic signal is smaller than a second threshold value, judging that no falling object exists in the fan hub.
5. The fan shed monitoring method according to any one of claims 1-4, wherein the shed is a bolt of a fan blade.
6. A fan fallen object monitoring device is used for monitoring whether fallen objects exist in a fan hub or not, and is characterized by comprising an acquisition module and a judgment module, wherein the acquisition module is used for acquiring an acoustic signal in the fan hub, the judgment module is used for judging whether fallen objects exist in the fan hub or not according to the kurtosis of the acoustic signal, and when the kurtosis of the acoustic signal is greater than or equal to a first threshold value, the acoustic signal is subjected to envelope demodulation processing so as to acquire a time domain diagram of the acoustic signal; performing Fourier transform on the time domain map to obtain a frequency domain map of the acoustic signal; acquiring the main frequency of the acoustic signal through the frequency domain graph, and judging whether a shedding object exists in the fan hub according to the ratio of the amplitude of the main frequency of the acoustic signal to the total amplitude of the acoustic signal or the ratio of the amplitude of the frequency multiplication of the main frequency of the acoustic signal to the total amplitude of the acoustic signal, wherein the main frequency of the acoustic signal is the frequency corresponding to the maximum amplitude in the frequency domain graph, and the total amplitude of the acoustic signal is the square sum of the amplitudes of all the frequencies in the frequency domain graph.
7. A fan fallout monitoring system comprising a monitor for monitoring an acoustic signal within a fan hub and a computer in communication with said monitor, said computer being configured to determine if there is a fallout within said fan hub based on a kurtosis of said acoustic signal, and when said kurtosis of said acoustic signal is greater than or equal to a first threshold, envelope demodulating said acoustic signal to obtain a time domain plot of said acoustic signal; performing Fourier transform on the time domain map to obtain a frequency domain map of the acoustic signal; acquiring the main frequency of the acoustic signal through the frequency domain graph, and judging whether a shedding object exists in the fan hub according to the ratio of the amplitude of the main frequency of the acoustic signal to the total amplitude of the acoustic signal or the ratio of the amplitude of the frequency multiplication of the main frequency of the acoustic signal to the total amplitude of the acoustic signal, wherein the main frequency of the acoustic signal is the frequency corresponding to the maximum amplitude in the frequency domain graph, and the total amplitude of the acoustic signal is the square sum of the amplitudes of all the frequencies in the frequency domain graph.
8. The fan fallout monitoring system of claim 7 wherein said monitor is a microphone;
or, the monitor includes adapter and collector, the adapter with the collector electricity is connected, the collector with computer communication.
9. A computer-readable storage medium having an executable program stored therein, the executable program when executed implementing the wind turbine fallout monitoring method of any of claims 1-5.
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| CN102828919A (en) * | 2011-06-14 | 2012-12-19 | 西门子公司 | Method for acoustically monitoring wind turbine, acoustic monitoring system and re-equipment kit |
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