KR101478504B1 - Method for Evaluating Malfunction By Detecting and Analyzing Vibration - Google Patents

Abstract

The present invention relates to a method for evaluating the malfunction by detecting and analyzing vibration. More specifically, the present invention relates to a method for evaluating the malfunction of a target by continuously detecting and analyzing vibration generated from machine, equipment, or facilities. A method of detecting the malfunction by a vibration analysis module independently operated to perform a self-detection operation of the vibration, to analyze the vibration and to determine the malfunction state includes the steps of: comparing detected vibration data with preset analysis data for the transmission of a comparison result; transmitting the comparison result at a predetermined period or when a malfunction parameter is generated by filtering the comparison result; determining a malfunction state based on the information received from a control unit; and making an alarm or making external communications depending on the determination result.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for detecting malfunction by vibration detection and analysis,

The present invention relates to a malfunction detection method based on vibration detection and analysis, and more particularly, to a malfunction detection method for continuously detecting and analyzing vibration generated from a machine, equipment, or facility to determine whether a malfunction has occurred.

A phenomenon in which things such as the position of an object or the intensity of a current are regularly changed is referred to as vibration, and all objects generate vibration when an external impact is applied. In addition, a machine, device or facility generates vibration during operation and in most cases generates a predetermined type of vibration within a certain error range. If the vibration originating from a machine, apparatus or equipment deviates from the prescribed form, it may be due to an abnormality in the operation of the machine, the apparatus or the equipment itself, or a temporary external impact. If the vibration is different from the predetermined type or pattern and lasts for a certain time, there is a high possibility that it is caused by a malfunction of the machine, the apparatus or the equipment. Therefore, it is possible to detect the operation error by analyzing the vibration generated from the machine, the device or the equipment itself.

As a prior art related to a diagnosis system based on vibration detection, Patent Publication No. 2013-0045589 'Diagnosis system using vibration sensor' is available. The above prior art detects an abnormal symptom such as vibration, leakage, abrasion or breakage of LM guides, motors, robots and various valves of semiconductor, LCD, LED and solar cell manufacturing apparatuses, And to take measures in advance to prevent the failure. For this purpose, the prior art includes a vibration target for generating a vibration signal; A sensor provided on the object to be vibrated to sense a vibration signal generated from the object; An A / D converter for converting the sensing signal input to the sensing signal receiver into digital data; a comparator for comparing the converted digital data with reference data; A determination unit for determining whether the diagnostic object is abnormal based on the comparison result, and a DB for storing the determined result data; And a server for receiving and processing a diagnostic signal processed by the control unit.

Another prior art for judging the abnormality of the instrument using a vibration sensor is Patent Registration No. 1275702 'Method and apparatus for defect diagnosis and detection of gearbox using vibration signal'. The prior art includes receiving a vibration signal measured by a sensor provided in a gear box; Converting the vibration signal input from the gear box into a 2D texton image signal; Extracting a feature using a SIFT algorithm based on the converted image signal; Producing a Texon dictionary based on the extracted features; And detecting and diagnosing an error of the gear box with reference to the extracted feature and the dictionary of the texture, and a defect detection method and a defect detection method of the gear box using the vibration signal.

The vibration detection system or apparatus disclosed in the prior art has a disadvantage that it is difficult to apply to a general apparatus or equipment that generates vibration. Also, the prior art is disadvantageous in that the sensor structure for vibration measurement is complicated, or it is difficult to install and analyze, and it is difficult to detect malfunctions quickly. On the other hand, the vibration measuring apparatus disclosed in the prior art has a problem that the vibration sensor simply measures vibration and analysis and judgment are performed separately.

The present invention has been made to solve the problems of the prior art and has the following purpose.

An object of the present invention is to provide a malfunction detection method by vibration detection and analysis, which enables a quick determination of malfunction of a machine, equipment, or apparatus with a simple structure.

It is another object of the present invention to provide a malfunction detection method based on vibration detection and analysis, which can be applied to a general device while being able to supply power to itself.

According to a preferred embodiment of the present invention, a malfunction detection method by a vibration analysis module that operates independently and detects and analyzes vibration itself and determines whether or not a malfunction has occurred is performed by comparing the detected vibration with predetermined analysis data step; Filtering the compared result and delivering it to the control device at regular intervals or when a malfunction parameter is generated; Determining whether there is a malfunction according to information transmitted from the control device; And generating an alarm or performing external communication according to the determination result.

According to another preferred embodiment of the present invention, a classification code and a transmission code are generated according to the analysis data and the comparison result, and a transmission method is determined according to the transmission code.

According to another preferred embodiment of the present invention, the control device receives a signal transmitted to the power control unit connected to the battery at regular intervals.

The method according to the present invention is advantageous in that it can be applied to general apparatuses so that a malfunction of the apparatus can be determined simply and quickly so that related measures can be taken. The method according to the present invention also has the advantage that the detection device can be made simple so that it can be made into a general-purpose measurement structure. In addition, the method of the present invention has the advantage that the cost of maintenance and maintenance is reduced by self-charging.

1 shows an embodiment of an operating structure for the application of the method according to the invention.
2 schematically shows an embodiment of the operation of the vibration sensor and the filter in the method according to the invention.
FIG. 3 illustrates an embodiment of a process of self-powering in a method according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.

The malfunction detection method according to the present invention comprises the steps of: comparing a detected vibration with predetermined analysis data and transmitting the detected vibration; Filtering the compared result and delivering it to the control device at regular intervals or when a malfunction parameter is generated; Determining whether there is a malfunction according to information transmitted from the control device; And generating an alarm or performing external communication according to the determination result.

The malfunction detection method according to the present invention is based on a vibration detection and analysis module which can be manufactured in small size and attached to each machine, equipment or facility and can be operated by a battery or a battery. The vibration detection and analysis module can be attached and detached to the device to be measured, and can be operated independently in a state in which no external power is supplied. The detected vibration is analyzed by itself and it is judged whether the malfunction is occurred. If it is judged that it is a malfunction, the alarm can be sent or the malfunctioning state can be transmitted to the outside through wired / wireless communication. The malfunction evaluation method by the detection module will be described in detail below.

Figure 1 shows an embodiment of an operating structure for the application of the method according to the invention.

1, the malfunction detection method includes a control unit 11, a vibration sensor 12 for transmitting detection and analysis results to the control unit 11, and a module including a battery or a battery 14 capable of supplying power .

The control unit 11 may be any microprocessor known in the art capable of controlling the operation of the entire module and may have a program necessary for the operation of each device. The vibration sensor 12 can measure the vibration from the object to be inspected and extract the vibration necessary for analysis from the detected vibration. Then, the extracted vibration can be transmitted to the analysis unit 121. The analysis unit 121 may store the comparison data and transmit it to the filter unit 13 in comparison with the vibration and analysis data detected from the vibration sensor 12 and extracted. The filter unit 13 can transmit the result of the transmission periodically or directly to the control unit 11. If it is determined that the signal is a malfunction signal, the filter unit 13 may immediately transmit the signal to the control unit. If it is determined that the signal is not a malfunction signal, the filter unit 13 may transmit the signal to the control unit 11 at regular intervals. In this way, in the method according to the present invention, whether or not a malfunction is judged immediately by the vibration sensor 12 and the result is transmitted periodically or immediately to the control unit 11, .

The control unit 11 may activate the alarm device 162 or transmit it to the electronic device 17 of the person concerned via the communication unit 161 depending on the result of the transmission. The communication unit 161 may be, for example, a wired or wireless communication chip, and the electronic device 17 may be a portable electronic device such as a mobile device or a management device such as a computer.

The analysis data stored in the analysis unit 121 needs to be updated. For example, the vibration generated from the apparatus to which the vibration sensor 12 is attached may change depending on the life of the machine or the external environment. On the other hand, the analysis data needs to be changed or added in accordance with seasonal or temporary changes in the installation environment. In such a case, the update data may be transferred from the data unit 16 to the control unit 11 via the communication unit 161. [ The control unit 11 may transmit the delivered update data to the analysis unit 121 to change, add, or delete some data.

In the method according to the present invention, the vibration detection and analysis module is operated by an independent power source and the power can be supplied by the battery 14. The battery 14 can be a rechargeable secondary battery and can be charged by the power generation unit 141. [ The power generation unit 141 may be, for example, a solar cell or an energy collection unit that generates electricity from vibration. The electric power generated by the electric power generating unit 141 may be supplied to the battery 14. And the charging of the battery 14 by the power supply unit 141 by the battery 14 and the charging of the battery 14 by the battery 14 can be controlled by the power control unit 15. [

The control unit 11 can detect the signal transmitted from the power control unit 15 to check the state of charge of the battery 14, the power supply state, or the power supply state of the power generation unit 141. [ In other words, the power control unit 15 can transmit the control result to the control unit 11 while controlling the battery 14 and the power generation unit 141. [ The control unit 11 can appropriately adjust the power supplied from the power control unit 15 as needed.

The vibration detection and analysis module for application of the method according to the present invention may be composed of a MEMS sensor and a MEMS power control module. The MEMS sensor may include a vibration sensor 12, an analysis unit 121 and a filter 13, and the power generation unit 141 may be made of an independent MEMS unit. On the other hand, the vibration detection and analysis module may be formed of a plurality of module structures and may be formed to be connected to each other by wire or wirelessly. For example, the vibration sensor 12, the analysis unit 121 and the filter 13 become one module, the power generation unit 141, the battery 14 and the power control unit 15 become different modules, The control unit 11, the alarm unit 162 and the communication chip 161 may be another module. Each of the modules can be coupled to each other, separated and installed, and can be wired or wirelessly connected.

A variety of structures can be formed for application of the method according to the invention and the invention is not limited to the embodiments shown.

2 schematically shows an embodiment of the operation process of the vibration sensor and the filter according to the present invention.

Referring to FIG. 2, the vibration sensor 12 measures vibration transmitted from an object to be inspected (S211). Then, vibration analysis is performed on the vibration measured at regular intervals (S212). Then, the vibration that deviates from a predetermined level is extracted from the analyzed vibration (S213) and transmitted to the analysis unit 121. [

The vibration sensor 12 may be a displacement sensor, a velocity sensor or an acceleration sensor depending on the object to be inspected, and may be, for example, a MEMS sensor. The vibration sensor 12 may be composed of a plurality of element units and may have a resonant element. The resonance element refers to a device that generates resonance vibration with respect to inherent vibration generated in an apparatus including a rotating machine such as an axis or a motor. The vibration sensor 12 measures vibration at a predetermined period (S211) and performs vibration analysis (S212). Vibration analysis may include, for example, analysis of amplitude, frequency, or wave form, and various methods known in the art such as Fourier transform, Gabor transform, or wavelet transform may be applied. As a result of the vibration analysis, the vibration requiring analysis may be extracted (S213). Then, the extracted vibration can be transmitted to the analysis unit 121.

The analysis unit 121 can classify the transmitted vibration (S221). The vibration classification can be predetermined and can be classified according to the type, frequency, amplitude, vibration structure, detected vibration cell or order of harmonics of the object to be inspected. The harmonic order refers to, for example, whether it corresponds to a fundamental wave or a second harmonic. The classification method can be predetermined and can be classified in various ways depending on the apparatus to be installed.

The extracted vibration may be at least one and classification may proceed for each. A classification code may be generated for each of them (S222).

The classification code is predetermined. For example, the classification code can be composed of fields such as date: time: type of machine: frequency: amplitude: vibration structure: harmonic order, and each can be displayed in digital form. A classification code having various structures can be generated and the classification code can include various factors. When the classification code is generated (S222), the vibration data may be called (S223).

The calling of the vibration data corresponds to, for example, a pre-generated classification code stored in the storage medium. The classification codes generated in advance are those classified according to the classification codes, for example, vibrations that may be generated from various gears, shafts, motors or other mechanical devices included in the inspection object in which the vibration sensor 12 is installed. The vibration data can be updated and newly added.

The vibration data called according to the classification code is compared with the transmitted vibration data (S223) and a transmission code can be generated accordingly (S225). In addition to the classification code, a transmission code is added with a field corresponding to the contrast result, or a difference value indicating a difference from a predetermined classification code in a part of the existing field is added. For example, the transmission code can have a structure such as date: time: type of machine: frequency - difference value: amplitude - difference value: vibration structure - difference value: harmonic order - difference value: final difference value: risk factor. The generated transmission code can be transmitted to the filter 13.

The filter 13 first determines the transmission period (S331). The determination of the transmission period may be determined according to the generated transmission code (S232). If the transmission code includes a risk factor, the filter 13 immediately transmits the transmission code (S234), and at the same time, the feedback is performed to determine whether the same type of vibration continuously occurs (S233). If the transmission code does not include a risk factor, the transmission code may be transmitted in a predetermined period (S234). If a transmission code is transmitted at a predetermined period (S233), the feedback is not performed.

The transmission code can be transmitted to the control unit (S234) and the data can be stored (S235).

The vibration sensor 12, the analysis unit 121 or the filter 13 according to the present invention can be operated in various ways, and the present invention is not limited to the embodiments shown.

The process of self-powering for application of the method according to the invention is described below.

FIG. 3 illustrates an embodiment of a process of self-powering in a method according to the present invention.

Referring to FIG. 3, the power generation module 32 may be, but is not limited to, a MEMS Harvesting unit or a solar cell module for generating energy from the generation of vibration. The battery module 33 may include a plurality of cells C1, C2, and C3. The plurality of cells (C1, C2, C3) may be the same or different battery cells and each may be connected to the sensor (34). The sensor 34 may detect the power generation status of the power generation module 32. [ The battery module 33 may have a connection terminal 38 and the connection terminal 38 may be a connection cable or an external power connection means, for example. As described above, the power generation module 32, the sensor 34, the battery module 33, and the power control unit 15 may be independent devices and may be connected to the vibration sensor module by a connection cable.

The microprocessor unit 31 controls the entire operation. The sensor 34 can transmit the power generation state detected from the power generation module 32 and the battery module 33 or the charging or discharging states of the respective battery cells C1, C2, C3 to the microprocessor unit 31 have. The battery module 33 is formed of a plurality of cells C1, C2, and C3 for replacing the charging and discharging cells in consideration of charging or discharging conditions. On the other hand, when one of the cells C1, C2, C3 is not in operation, it can be replaced with another cell C1, C2, C3. The number of the battery cells (C1, C2, C3) is not particularly limited.

The microprocessor 31 can control the connection state of the charging circuit 35 and the battery management unit 37 by controlling the switch unit 36 in accordance with the power generation state. The charging circuit 35 may include, for example, a transformer, a constant voltage circuit, an overvoltage protection circuit, and the switch unit 36 may be controlled in a program form. It is possible to determine the cells (C1, C2, C3) to which electric power to be supplied from, for example, the charging circuit 35 is to be supplied for managing the charging and discharging states of the respective batteries of the battery management unit 37 The discharge cells C1, C2, and C3 can be determined. The battery management unit 37 can also determine the charging method when an external power source is connected to the connection terminal 38 for charging the cells C1, C2, and C3. Further, the battery management unit 37 can determine the discharge method. For example, if more than 80% of the cells are discharged in one cell (for example, C1), the discharged cells C1 can be charged while discharging is performed from another cell (for example, C2). The battery management unit 37 can manage the battery module 33 in various ways, and the present invention is not limited to the embodiments shown.

The power generation or battery control schemes shown in FIG. 3 are illustrative, and the present invention is not limited to the embodiments shown.

The method according to the present invention is advantageous in that it can be applied to general apparatuses so that a malfunction of the apparatus can be determined simply and quickly so that related measures can be taken. The method according to the present invention also has the advantage that the detection device can be made simple so that it can be made into a general-purpose measurement structure. In addition, the method of the present invention has the advantage that the cost of maintenance and maintenance is reduced by self-charging.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

11: control unit 12: vibration sensor
13: Filter unit 14:
15: power control unit 17: electronic device
31: Microprocessor unit 32: Power generation module
33: Battery module 34: Sensor
35: Charging circuit 37: Battery management unit
38: Connection terminal
121: Analysis unit 141: Power generation unit
161: communication unit 162: alarm device

Claims (3)

A malfunction detection method using a vibration analysis module that operates independently and detects a malfunction by detecting and analyzing vibration itself,
Comparing the detected vibration with predetermined analysis data and transmitting the detected vibration;
Filtering the compared result and delivering it to the control device at regular intervals or when a malfunction parameter is generated;
Determining whether there is a malfunction according to information transmitted from the control device; And
And generating an alarm or external communication according to a result of the determination, wherein the controller receives the signal transmitted to the power control unit connected to the battery at regular intervals. The method according to claim 1, wherein a classification code and a transmission code are generated according to the analysis data and a comparison result, and a transmission method is determined according to a transmission code. delete

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