CN110763445B - Brake monitoring method, device, equipment and storage medium - Google Patents
Brake monitoring method, device, equipment and storage medium Download PDFInfo
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- CN110763445B CN110763445B CN201910966891.9A CN201910966891A CN110763445B CN 110763445 B CN110763445 B CN 110763445B CN 201910966891 A CN201910966891 A CN 201910966891A CN 110763445 B CN110763445 B CN 110763445B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention discloses a brake monitoring method, a brake monitoring device, brake monitoring equipment and a storage medium. The method comprises the following steps: the method comprises the steps of obtaining an initial vibration signal collected by a vibration sensor at a brake monitoring point, determining a brake signal energy value according to the initial vibration signal, and determining braking force change information of a brake according to the brake signal energy value. According to the embodiment of the invention, the on-line real-time monitoring of the braking force change and the working state of the brake is realized by analyzing the vibration signal output by the vibration sensor on the brake, and the safety monitoring level of the brake is improved.
Description
Technical Field
The invention belongs to the field of equipment monitoring, and particularly relates to a brake monitoring method, a brake monitoring device, brake monitoring equipment and a storage medium.
Background
A brake is a mechanical part that stops or decelerates a moving part in a mechanical device. Commonly called brake and brake. The brake for the crane in the industrial brake is a working device and a safety device for the crane, and the brake can stably stop the lifted or lowered goods at a required height or control the lifting or lowering speed in a lifting mechanism.
The braking capability of the brake is concerned with equipment and personal safety, the traditional brake overhaul intelligence depends on manual regular maintenance, but regular maintenance and overhaul cannot prevent risks in time. The brake can have serious consequences once problems occur. Therefore, it is an urgent problem to improve the safety monitoring level of the brake.
Disclosure of Invention
The embodiment of the invention provides a brake monitoring method, a brake monitoring device, brake monitoring equipment and a computer storage medium.
In a first aspect, an embodiment of the present invention provides a brake monitoring method, including: acquiring an initial vibration signal acquired by a vibration sensor at a brake monitoring point; determining a braking signal energy value according to the initial vibration signal; and determining the braking force change information of the brake according to the braking signal energy value.
In one possible implementation, the method further comprises: and determining the braking force of the brake according to the braking signal energy value.
In one possible implementation, a braking signal is determined from the initial vibration signal based on a braking signal feature extraction algorithm; and determining the energy value of the brake signal according to the brake signal.
In one possible implementation, a direct current component signal of the vibration sensor is subtracted from the initial vibration signal to obtain a vibration signal, wherein the direct current component signal is a short-circuit signal generated by the vibration sensor in a short-circuit transient process; carrying out filtering calculation on the vibration signal to obtain a vibration filtering signal; and performing feature extraction calculation on the vibration filtering signal based on a brake signal feature extraction algorithm to obtain a brake signal.
In one possible implementation, the method further comprises: determining time-frequency change information of the braking signal according to the braking signal; and if the time-frequency change information of the braking signal meets the preset condition, determining that the brake breaks down.
In one possible implementation, the brake monitoring point includes: the brake shoe position area of the brake and/or the arm position area of the brake.
In a second aspect, an embodiment of the present invention provides a brake monitoring device, including: the signal acquisition module is used for acquiring an initial vibration signal acquired by the vibration sensor at a brake monitoring point; the signal processing module is used for determining the energy value of the braking signal according to the initial vibration signal; and the monitoring and identifying module is used for determining the braking force change information of the brake according to the braking signal energy value.
In a third aspect, an embodiment of the present invention provides a computing device, where the device includes: a processor and a memory storing computer program instructions; the processor, when executing the computer program instructions, implements the computing method as provided by embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention provides a computer storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the computer program instructions implement the processing method provided by the embodiment of the present invention.
According to the brake monitoring method, the brake monitoring device, the brake monitoring equipment and the computer storage medium, the vibration sensor is arranged on the brake, the vibration signal is analyzed, and then the on-line real-time monitoring of the brake force change of the brake is realized, so that major safety accidents caused by brake force reduction, brake failure and the like of the brake are effectively prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a brake monitoring method provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a plurality of positional vibration signals provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a single position vibration signal provided by an embodiment of the present invention;
FIG. 4 is a schematic illustration of a brake signal provided by an embodiment of the present invention;
FIG. 5 is a schematic illustration of a brake signal provided by an embodiment of the present invention;
FIG. 6 is a schematic illustration of a brake signal provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of signal energy provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of signal energy provided by an embodiment of the present invention;
FIG. 9 is a schematic diagram of signal energy provided by an embodiment of the present invention;
FIG. 10 is a schematic illustration of another braking signal provided by an embodiment of the present invention;
FIG. 11 is a schematic illustration of another braking signal provided by an embodiment of the present invention;
FIG. 12 is a schematic illustration of another braking signal provided by an embodiment of the present invention;
FIG. 13 is a time-frequency diagram of a brake signal according to an embodiment of the present invention;
FIG. 14 is a time-frequency diagram of a brake signal according to an embodiment of the present invention;
FIG. 15 is a time-frequency diagram of a brake signal according to an embodiment of the present invention;
FIG. 16 is a schematic illustration of yet another braking signal provided by an embodiment of the present invention;
FIG. 17 is a time-frequency diagram of another braking signal according to an embodiment of the present invention;
FIG. 18 is a flow chart of a brake monitoring algorithm provided by an embodiment of the present invention;
FIG. 19 is a schematic structural diagram of a brake monitoring device provided in accordance with an embodiment of the present invention;
FIG. 20 is a schematic structural diagram of a brake monitoring device provided in accordance with an embodiment of the present invention;
fig. 21 is a schematic diagram of an exemplary hardware architecture provided by an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
A brake is a device having a function of decelerating, stopping, or holding a stopped state of a moving member or a moving machine. Is a mechanical part that stops or decelerates moving parts in a machine. Commonly called brake and brake. The brake mainly comprises a braking frame, a braking piece, an operating device and the like. Some brakes are also equipped with automatic adjustment of the brake clearance. In order to reduce the braking torque and the structural size, the brake is usually mounted on the high-speed shaft of the equipment, but large equipment with high requirements on safety, such as a mine hoist, an elevator and the like, is mounted on the low-speed shaft close to the working part of the equipment.
In industrial operation, a brake for a crane is a working device and a safety device for the crane, the brake can stably stop a lifted or lowered cargo at a required height or control the lifting or lowering speed in a lifting mechanism, and the brake can stably stop the mechanism at a required position in a mechanism such as a running mechanism or a luffing mechanism.
The brake capability of the brake is concerned with equipment and personal safety, and the traditional brake maintenance intelligence depends on manual regular maintenance. Regular maintenance and repair still presents a significant risk.
In order to improve the brake monitoring efficiency and accuracy, the embodiment of the invention provides a brake monitoring method, and the following first describes the brake monitoring method provided by the embodiment of the invention in detail.
Fig. 1 is a schematic flow chart of a user brake monitoring method according to an embodiment of the present invention.
As shown in fig. 1, the execution subject of the method is a server, and the method may include S101-S103, which are specifically as follows:
s101, acquiring an initial vibration signal acquired by a vibration sensor at a brake monitoring point.
In one embodiment, the brake monitoring points comprise: the brake shoe position area of the brake and/or the arm position area of the brake.
In order to effectively analyze the working state of the brake, the braking force monitoring points of the brake need to be selected, and the vibration signal effect monitored by the vibration sensor installed at the brake monitoring points is determined to be good through experimental analysis, namely the vibration signal has strong amplitude, clear waveform and large energy and is obviously different from background noise. Data acquisition is performed by mounting 8 vibration acceleration sensors (e.g., model number AYDV00) at different locations of a brake (e.g., model number DLZ-100) device, respectively.
Fig. 2 is a schematic diagram of a multi-position vibration signal according to an embodiment of the present invention. The vibration sensor measures acceleration generated when vibrating. The output unit is mv/g, where millivolts (mv) is the unit of voltage. g is the gravitational acceleration unit. For example, the output standard of a vibration sensor is 100 mv/g. The output of the sensor is a voltage of 200mv when the measured vibration acceleration reaches 2 g. When the vibration acceleration reaches 10g, the output of the sensor is a voltage of 1000 mv. As shown in FIG. 2, the horizontal axis represents TIME in milliseconds (ms) and the vertical axis represents the vibration sensor sensitivity V in 100 mv/g.
As shown in fig. 2, it can be observed that the amplitude intensity of the vibration signal collected by the channel 1(CH1), the channel 5(CH5) and the channel 8(CH8) is large, the waveform is clear, the vibration signal is obviously distinguished from the background noise and the energy is large when the brake is normally braked. The positions of the brake corresponding to the channel 1, the channel 5 and the channel 8 are a moment arm position area of the brake and a brake shoe position area of the brake, so that the working state of the brake can be effectively analyzed by installing sensors for collecting vibration signals in the moment arm position area of the brake and the brake shoe position area of the brake. Of course, the above are only illustrative sensor and brake types, and the invention is not limited to this.
And S102, determining the energy value of the braking signal according to the initial vibration signal.
According to the detected initial vibration signal of the brake, a single braking signal is determined through preprocessing and a braking signal characteristic extraction algorithm, and a braking signal energy value corresponding to the single braking signal is determined by utilizing a signal energy algorithm.
In one embodiment, a braking signal is determined from the initial vibration signal based on a braking signal feature extraction algorithm; and determining the energy value of the brake signal according to the brake signal.
And (4) installing a vibration sensor at the brake monitoring point determined in the S101, and accurately and automatically capturing a brake signal by using a brake signal feature extraction algorithm in the process of controlling the brake to change the braking force of the brake. For example, in the process of adjusting the lead screw clearance of the brake, the single braking signal is extracted by a braking signal feature extraction algorithm. Fig. 3 is a schematic diagram of a single-position vibration signal according to an embodiment of the present invention. As shown in fig. 3, the horizontal axis is time in milliseconds (ms) and the vertical axis is vibration sensor sensitivity in 100mv/g, and it can be observed that the vibration signal in the box is a single brake signal. And calculating the energy value of the brake signal through the extracted brake signal of the brake.
4-6 are schematic diagrams of a brake signal provided by an embodiment of the present invention, with time on the horizontal axis and vibration sensor sensitivity on the vertical axis; 7-9 are schematic diagrams of signal energy provided by embodiments of the present invention, with time on the horizontal axis and brake signal energy on the vertical axis; the brake signal energy diagrams shown in fig. 7-9 correspond to the brake signal diagrams shown in fig. 4-6, respectively. That is, the brake signal energy values in the signal energy diagrams shown in fig. 7-9 are determined from the brake signals in the brake signal diagrams of fig. 4-6, respectively.
In one embodiment, a direct current component signal of the vibration sensor is subtracted from the initial vibration signal to obtain a vibration signal, wherein the direct current component signal is a short-circuit signal generated by the vibration sensor in a short-circuit transient process; carrying out filtering calculation on the vibration signal to obtain a vibration filtering signal; and performing feature extraction calculation on the vibration filtering signal based on a brake signal feature extraction algorithm to obtain a brake signal.
In one embodiment, the braking force of the brake is determined based on the brake signal energy value.
In one embodiment, as shown in table 1 and table 2, the braking force variation experiment is performed at the moment arm position 1 and the moment arm position 2, respectively, and the experiment conditions of experiment 3, experiment 4 and experiment 6 are that the braking force is decreased sequentially, and the braking signal energy data is taken 7 times in each experiment process, and the average value of the energy value of the braking signal at each time is calculated, wherein the braking signal is not clearly used, and the braking times are correspondingly decreased when the average value is calculated. The force arm position 1 and the force arm position 2 shown in the tables 1 and 2 show that the energy of the brake signal is in a descending trend along with the descending of the brake force through calculation. Therefore, the brake can carry out effective on-line monitoring on the braking force change by installing the vibration sensor, and the vibration sensor is arranged in the arm area of the brake to calibrate the braking force, so that the quantitative monitoring on the braking force is realized.
TABLE 1 comparison of brake signal energy at arm position 1
TABLE 2 comparison of braking signal energy at moment arm position 1
In one embodiment, according to the brake signal, determining time-frequency change information of the brake signal; and if the time-frequency change information of the braking signal meets the preset condition, determining that the brake breaks down.
10-12 are graphs of alternative braking signals provided by embodiments of the present invention, with time on the horizontal axis and vibration sensor sensitivity on the vertical axis; fig. 13-15 are Time-frequency diagrams of brake signals according to embodiments of the present invention, in which the horizontal axis represents Time (Time or space values) in fig. 13-15, and the vertical axis represents signal frequency (frequencies of signals) in fig. 13-15. The time-frequency diagrams of the braking signals shown in fig. 13-15 correspond to the schematic diagrams of the braking signals shown in fig. 10-12, respectively. That is, the brake signal time-frequency variation information shown in fig. 13-15 is determined from the brake signals of fig. 10-12, respectively.
In one embodiment, there is a difference in signal frequency and signal composition from the brake signal of the brake in the normal state due to the brake signal of the brake in the fault state. The brake signals of the brakes in different types of fault states are compared with the brake signals of the brakes in normal states and time-frequency change information, the fault signals generated by the brakes in different types of fault states can be analyzed, and the fault types and states of the brakes are monitored and identified by extracting the characteristics of the fault signals.
In one embodiment, a broken lead screw may generate a fault signal frequency, and the fault may cause a difference in the frequency and the composition of the brake signal. For example, fig. 16 and 17 are a schematic diagram of a brake signal and a time-frequency diagram of the brake signal in a failure state of a damaged screw rod, respectively. FIG. 16 is a schematic illustration of yet another braking signal provided by an embodiment of the present invention; fig. 17 is a time-frequency diagram of another braking signal according to an embodiment of the present invention. If the time-frequency change information of the brake signal meets the preset condition, for example, if the change condition of the brake signal change information of the brake signal schematic diagram occurs as shown in fig. 16, or the time-frequency change information of the brake signal time-frequency diagram occurs as shown in fig. 17, it is determined that the brake is in failure.
And S103, determining the braking force change information of the brake according to the braking signal energy value.
In one embodiment, as shown in tables 3 and 4, the brake force variation experiment is performed at the brake shoe position 1 and the brake shoe position 2 respectively, the experiment conditions of experiment 3, experiment 4 and experiment 6 are that the brake force is reduced sequentially, the brake signal energy data is taken 7 times in each experiment process, the average value of the energy value of each brake signal is calculated, wherein the brake signal is not clear and is not adopted, and the brake times are reduced correspondingly when the average value is calculated.
It was found by calculation that the brake signal energy at the brake shoe position 1 and the brake shoe position 2 shown in tables 3 and 4 shows a sharp decrease tendency as the braking force decreases. Therefore, the vibration sensor of the position of the brake shoe can detect the instant change of the braking force of the brake, and is the most effective position point for monitoring the instant change of the braking force of the brake. The brake can sensitively sense the braking force by installing the vibration sensor at the position of the brake shoe, thereby realizing the on-line monitoring of the braking force change of the brake.
According to the invention, the vibration sensor is arranged on the brake, the vibration signal is analyzed through self-adaptive algorithms such as a brake signal characteristic extraction algorithm and the like, and the braking force change and the working state of the brake are monitored on line in real time, so that major safety accidents caused by brake force reduction, brake failure and the like of the brake are effectively avoided.
TABLE 3 brake shoe position 1 brake signal energy comparison
TABLE 4 brake shoe position 2 brake signal energy comparison
Fig. 18 is a flowchart of a brake monitoring algorithm according to an embodiment of the present invention, and as shown in fig. 18, first, an initial vibration signal of a brake is acquired by a vibration sensor, then a direct current component signal of the vibration sensor is subtracted from the initial vibration signal to obtain a vibration signal, the vibration signal is filtered to remove noise, a vibration filtering signal is obtained, and then a brake signal is obtained by performing feature extraction calculation on the vibration filtering signal based on a brake signal feature extraction algorithm, i.e., an energy method.
And secondly, performing two-aspect frequency spectrum analysis on the braking signal, namely determining the energy value of the braking signal according to the braking signal, and performing braking force drop monitoring and braking force change quantitative detection on the brake. On the other hand, the time-frequency change information of the brake signal is determined according to the brake signal, namely frequency detection is carried out, and if the time-frequency change information of the brake signal meets the preset condition, the brake is determined to be in fault. Therefore, the brake is effectively monitored on line from two aspects of brake signal energy and brake signal time-frequency change information, and major safety accidents are avoided.
The brake working state is monitored on line in real time to replace traditional manual regular maintenance, braking force attenuation judgment and quantitative detection can be carried out on the working state of the brake according to the state of the brake, a fixed threshold value is not required to be set for state judgment, and meanwhile, the fault of the brake can be detected. The detection can be realized through the cloud platform, and the working state of each brake is monitored in real time, so that major safety accidents are effectively avoided.
Fig. 19 shows a schematic configuration diagram of a brake monitoring device 1900 according to an embodiment of the present invention.
As shown in fig. 19, the apparatus 1900 may include a brake monitoring unit 1901 and a control unit 1902. The brake monitoring unit 1901 may be mainly configured to measure a vibration signal of a vibration sensor mounted on the brake; the control unit 1902 is mainly configured to determine braking force variation information of the brake according to the vibration signal, so as to determine the brake operating state.
Further, the brake monitoring unit 1901 may specifically be configured to determine a brake signal from the initial vibration signal based on a brake signal feature extraction algorithm; and determining the energy value of the brake signal according to the brake signal.
The brake monitoring unit 1901 is further configured to subtract a direct-current component signal of the vibration sensor from the initial vibration signal to obtain a vibration signal, where the direct-current component signal is a short-circuit signal generated by the vibration sensor in a short-circuit transient process; carrying out filtering calculation on the vibration signal to obtain a vibration filtering signal; and performing feature extraction calculation on the vibration filtering signal based on a brake signal feature extraction algorithm to obtain a brake signal.
In one embodiment, the brake monitoring points comprise: the brake shoe position area of the brake and/or the arm position area of the brake.
Based on this, the control unit 1902 can be specifically configured to determine braking force variation information of the brake according to the braking signal energy value. The control unit 1902 further determines the braking force of the brake based on the braking signal energy value.
In one embodiment, the control unit 1902 is further configured to determine, according to the braking signal, time-frequency variation information of the braking signal; and if the time-frequency change information of the braking signal meets the preset condition, determining that the brake breaks down.
In one embodiment, the control unit 1902 may send a prompt message and/or an alarm message, and when the braking force variation information of the brake meets a preset braking force variation condition and/or the braking signal time-frequency variation information meets a preset condition, that is, when the running state of the brake is determined to be a state with a potential fault hazard, the control unit sends a prompt message to prompt a monitoring person that the potential safety hazard may exist in the brake; when the running state of the brake is determined to be a fault state, the control unit sends out alarm information for warning detection personnel that the brake is in the fault state.
The prompt information and/or the warning information sent by the control unit can inform a brake maintainer to check the condition of the relevant parts of the brake in time, and the parts with the fault hidden danger can be repaired and replaced in time, so that major safety accidents are avoided.
In one embodiment, when the operating state of the brake is determined to be a fault state, the control unit 1902 is further configured to send a control signal to initiate an emergency measure, so that the brake is stably stopped and no longer operated until the brake is restarted after a maintenance confirmation by a maintenance person.
Fig. 20 is a schematic structural diagram of a brake monitoring device according to an embodiment of the present invention. As shown in fig. 20, the apparatus 2000 specifically includes 2010-2030, which is specifically as follows:
the signal acquisition module 2010 is used for acquiring an initial vibration signal acquired by the vibration sensor at a brake monitoring point;
the signal processing module 2020 is used for determining a brake signal energy value according to the initial vibration signal;
and the monitoring and identifying module 2030 is used for determining the braking force change information of the brake according to the braking signal energy value.
Each unit of the device can implement the method shown in fig. 1 and achieve the corresponding technical effect, and for brevity, the description is omitted here.
Fig. 2100 illustrates a hardware schematic diagram of a brake monitoring method according to an embodiment of the present invention.
The processing device may include a processor 2101 and a memory 2102 storing computer program instructions.
The processor 2101 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
The processor 2101 may implement any of the processing methods described above in the embodiment illustrated in fig. 1 by reading and executing the computer program instructions stored in the memory 2102.
In one example, the processing device can also include a communication interface 2103 and a bus 2100. As shown in fig. 21, the processor 2101, the memory 2102, and the communication interface 2103 are connected to each other via a bus 2100, and communication with each other is completed.
The communication interface 2103 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
The bus 2100 includes hardware, software, or both to couple the components of the brake monitoring device to one another. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. The bus 2100 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
The processing device may execute the brake monitoring method in the embodiment of the present invention, thereby implementing the brake monitoring method and apparatus described in conjunction with fig. 1 and 20.
In addition, in combination with the brake monitoring method in the above embodiments, the embodiments of the present invention may be implemented by providing a computer storage medium. The computer storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement any of the brake monitoring methods of the above embodiments.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented in software, and the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A brake monitoring method, comprising:
acquiring an initial vibration signal acquired by a vibration sensor at a brake monitoring point;
determining a braking signal energy value according to the initial vibration signal;
determining braking force change information of the brake according to the braking signal energy value;
determining a braking signal according to the initial vibration signal based on a braking signal feature extraction algorithm;
determining time-frequency change information of the braking signal according to the braking signal;
and if the time-frequency change information of the braking signal meets a preset condition, determining that the brake breaks down.
2. The method of claim 1, further comprising: and determining the braking force of the brake according to the braking signal energy value.
3. The method of claim 1 or 2, wherein the determining a brake signal energy value comprises:
and determining the energy value of the brake signal according to the brake signal.
4. The method of claim 1, wherein determining a braking signal from the initial vibration signal comprises:
subtracting a direct-current component signal of the vibration sensor from the initial vibration signal to obtain a vibration signal, wherein the direct-current component signal is a short-circuit signal generated by the vibration sensor in a short-circuit transient process;
carrying out filtering calculation on the vibration signal to obtain a vibration filtering signal;
and performing feature extraction calculation on the vibration filtering signal based on the brake signal feature extraction algorithm to obtain the brake signal.
5. The method of claim 1, wherein the brake monitoring points comprise:
a shoe position region of the brake and/or a lever arm position region of the brake.
6. A brake monitoring device, comprising:
the signal acquisition module is used for acquiring an initial vibration signal acquired by the vibration sensor at a brake monitoring point;
the signal processing module is used for determining the energy value of the braking signal according to the initial vibration signal;
the monitoring and identifying module is used for determining the braking force change information of the brake according to the braking signal energy value;
the signal processing module is also used for determining a braking signal according to the initial vibration signal based on a braking signal feature extraction algorithm;
determining time-frequency change information of the braking signal according to the braking signal;
and if the time-frequency change information of the braking signal meets a preset condition, determining that the brake breaks down.
7. A computing device, the device comprising: a processor and a memory storing computer program instructions; the processor, when executing the computer program instructions, implements a brake monitoring method as claimed in any one of claims 1-5.
8. A computer storage medium having computer program instructions stored thereon which, when executed by a processor, implement a brake monitoring method according to any one of claims 1 to 5.
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| CN114776742B (en) * | 2022-04-27 | 2023-06-30 | 江西五十铃汽车有限公司 | Replacement reminding method and system for automobile brake pads based on Internet of vehicles platform |
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