CN109026553B - Vibration sensing device, data screening and direction judging method and fan monitoring system - Google Patents
Vibration sensing device, data screening and direction judging method and fan monitoring system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 61
- 238000012216 screening Methods 0.000 title claims abstract description 11
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- 229910000906 Bronze Inorganic materials 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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Abstract
The invention relates to a vibration sensing device, a data screening and direction judging method and a fan monitoring system, wherein the fan vibration monitoring system comprises a fan multi-directional vibration sensor, a data transmission module, a fan main control PLC (programmable logic controller) and a monitoring analysis server, the fan multi-directional vibration sensor comprises a multi-directional vibration sensing device, the multi-directional vibration sensing device comprises a mounting seat, a swinging block is arranged on the mounting seat, a plurality of elastic beam pairs are arranged on the mounting seat in a manner of surrounding the swinging block, each elastic beam pair comprises two elastic beams, and each elastic beam is respectively provided with a piezoelectric plate for converting a deformation quantity into a corresponding electric signal. Setting a threshold value, and if each electric signal data in any group is smaller than the threshold value, discarding the group of electric signal data; if only the electrical signal data corresponding to the two elastic beams in one of the two adjacent sets of effective electrical signal data is greater than the threshold value and the maximum value alternately appears, the direction of the elastic beam pair is the vibration direction.
Description
Technical Field
The invention relates to a vibration sensing device, a data screening and direction judging method and a fan monitoring system, in particular to a multi-direction vibration sensing device, a fan vibration monitoring system using the multi-direction vibration sensing device and a data screening and vibration direction judging method.
Background
Wind power generation is a clean and renewable novel energy source, and the number of wind power generators (called fans for short) is rapidly increased. As a key device of wind power generation, a fan inevitably breaks down due to complex operation environment. If an abnormal shutdown is thus caused, the power generation efficiency is seriously affected. Therefore, it is necessary and urgent to monitor the critical operating signals of the wind turbine and analyze and diagnose the fault of the wind turbine. The faults of the fan mainly comprise electrical faults and mechanical faults, the monitoring, analyzing and diagnosing system related to the electrical signals of the fan is mature at present, and the monitoring, analyzing and fault diagnosing technology related to the mechanical signals of the fan is relatively deficient. The mechanical fault of the fan is usually expressed from the aspect of vibration, and the diagnosis of the mechanical fault of the fan according to the monitoring and analysis of the vibration signal is the main means of the current maintenance and management of the fan.
In the prior art, a vibration sensor is arranged at a monitoring position for monitoring and analyzing a fan vibration signal, and acquired data is transmitted to a master control PLC and a server connected with the master control PLC through a cable or an optical fiber. The vibration sensor who waits to detect position setting among the prior art at the fan can only gather the unilateral vibration data mostly, and under actual conditions, fan monitoring position can all vibrate on the multiaspect to the vibration of equidirectional is different to the influence at monitoring position, and current vibration sensor can't gather the vibration data in other directions, has reduced vibration sensor data collection's accuracy, can't carry out accurate judgement to the vibration direction at monitoring position. In addition, the existing reported fan vibration monitoring system usually needs real-time transmission of signals acquired by a vibration sensor, wherein the signals include micro vibration which does not damage the fan monitoring part in the environment, the data transmission quantity is increased, a large amount of space of a system database is occupied, the working strength of an analysis server is increased, and the efficiency of the monitoring and analysis system is seriously reduced. In addition, the fan vibration monitoring system disclosed in the prior art needs an external power supply or provides a backup battery to supply power for the vibration sensor and other electric parts, and data transmission is performed in a wired communication mode, so that wiring is complex and later maintenance is difficult.
Disclosure of Invention
The invention aims to provide a fan vibration monitoring system, which aims to solve the technical problems that the vibration monitoring system in the prior art can only acquire unidirectional vibration data and cannot accurately judge the vibration direction; a multi-directional vibration sensing device and a data screening and vibration direction judging method are also provided.
In order to achieve the purpose, the technical scheme of the fan vibration monitoring system is as follows: the utility model provides a fan vibration monitoring system, includes multi-direction vibration sensor of fan, data transmission module, fan master control PLC and monitoring analysis server, multi-direction vibration sensor of fan includes multi-direction vibration sensing device, and multi-direction vibration sensing device is including being used for installing the mount pad on the fan treats monitoring position, be equipped with on the mount pad and can treat the pendulum piece that the vibration of monitoring position takes place the beat along the fan, surround on the mount pad a plurality of elastic beam pairs have been arranged to the pendulum piece, and each elastic beam pair all includes along two elastic beam of central symmetrical arrangement, is equipped with respectively on each elastic beam and takes place deformation and convert the deformation volume into the piezoelectric patches that corresponds the signal of telecommunication when corresponding the elastic beam by the pendulum piece striking.
The invention has the beneficial effects that: the fan vibration monitoring system provided by the invention comprises a fan multi-directional vibration sensor, a data transmission module, a fan master control PLC (programmable logic controller) and a monitoring analysis server, wherein the fan multi-directional vibration sensor comprises a multi-directional vibration sensing device, the multi-directional vibration sensing device comprises a mounting seat and a swinging block arranged on the mounting seat, a plurality of elastic beam pairs are arranged on the mounting seat in a surrounding manner, each elastic beam pair comprises two elastic beams symmetrically arranged along the center, and each elastic beam is provided with a piezoelectric patch. When the vibration detection device is used, when the part to be monitored of the fan vibrates, the vibration detection device can drive the fan to swing to generate deflection, the swing block impacts the elastic beam and rebounds, when the piezoelectric piece impacts the elastic beam, the piezoelectric piece can send out a corresponding electric signal, and whether the direction is the vibration direction can be judged by judging whether the electric signal exists or not and judging the size of the electric signal.
The elastic beams are uniformly arranged at intervals along the circumferential direction, the circumferential distance between every two adjacent elastic beams is smaller than the external size of the swinging block, and the external size of the swinging block is smaller than the sum of the two circumferential distances and the circumferential size of the elastic beams.
A plurality of radial sliding grooves are arranged on the mounting seat at intervals along the circumferential direction, and the radial position of each elastic beam is adjustably arranged in each radial sliding groove.
One end of the elastic beam is arranged on the mounting seat, the other end of the elastic beam is a free end, an end weighting block is arranged on one side of the free end, which deviates from the swinging block, and the root of the elastic beam is provided with the piezoelectric patches.
The mounting base is including being used for installing the base that waits to monitor the position at the fan and the cover body that the base was established to the fixed cover, base and cover body go up the branch and be equipped with elastic beam and pendulum piece, the pendulum piece through the extension spring suspension in on the top inner wall of the cover body.
The multi-direction vibration sensing device comprises a base, a top permanent magnet and a bottom permanent magnet, wherein the top permanent magnet is suspended on the inner wall of the top end of the cover body, the bottom permanent magnet is arranged on the base and vertically corresponds to the top permanent magnet, an electromagnetic coil is arranged in a magnetic field formed by the top permanent magnet and the bottom permanent magnet between the top permanent magnet and the bottom permanent magnet, and the electromagnetic coil is provided with two wiring ends extending to the outside of the cover body.
The pendulum block also comprises a magnetic isolation sleeve and a rigid collision sleeve which are sleeved outside the top permanent magnet in the circumferential direction from inside to outside in sequence.
The multidirectional vibration sensing device further comprises a magnetic shielding sleeve sleeved outside the electromagnetic coil and the bottom permanent magnet, and the cover body is a magnetic shielding shell.
The technical scheme of the multidirectional vibration sensing device is as follows: the utility model provides a multi-direction vibration sensing device, is including being used for installing the mount pad on the fan treats monitoring position, be equipped with the pendulum piece that can wait to monitor the vibration of position along with the fan on the mount pad and take place the beat, surround on the mount pad the pendulum piece has arranged a plurality of elastic beam right, and each elastic beam is to all including two elastic beam along central symmetrical arrangement, is equipped with respectively on each elastic beam to take place deformation and convert the deformation volume into the piezoelectric patches that corresponds the signal of telecommunication when corresponding elastic beam is by the pendulum piece striking.
The invention has the beneficial effects that: the invention provides a multidirectional vibration sensing device which comprises a mounting seat and a swinging block arranged on the mounting seat, wherein a plurality of elastic beam pairs are arranged on the mounting seat in a surrounding manner, each elastic beam pair comprises two elastic beams which are symmetrically arranged along the center, and each elastic beam is provided with a piezoelectric piece. When the vibration detection device is used, when the part to be monitored of the fan vibrates, the vibration detection device can drive the fan to swing to generate deflection, the swing block impacts the elastic beam and rebounds, when the piezoelectric piece impacts the elastic beam, the piezoelectric piece can send out a corresponding electric signal, and whether the direction is the vibration direction can be judged by judging whether the electric signal exists or not and judging the size of the electric signal.
The elastic beams are uniformly arranged at intervals along the circumferential direction, the circumferential distance between every two adjacent elastic beams is smaller than the external size of the swinging block, and the external size of the swinging block is smaller than the sum of the two circumferential distances and the circumferential size of the elastic beams.
A plurality of radial sliding grooves are arranged on the mounting seat at intervals along the circumferential direction, and the radial position of each elastic beam is adjustably arranged in each radial sliding groove.
One end of the elastic beam is arranged on the mounting seat, the other end of the elastic beam is a free end, an end weighting block is arranged on one side of the free end, which deviates from the swinging block, and the root of the elastic beam is provided with the piezoelectric patches.
The mounting base is including being used for installing the base that waits to monitor the position at the fan and the cover body that the base was established to the fixed cover, base and cover body go up the branch and be equipped with elastic beam and pendulum piece, the pendulum piece through the extension spring suspension in on the top inner wall of the cover body.
The multi-direction vibration sensing device comprises a base, a top permanent magnet and a bottom permanent magnet, wherein the top permanent magnet is suspended on the inner wall of the top end of the cover body, the bottom permanent magnet is arranged on the base and vertically corresponds to the top permanent magnet, an electromagnetic coil is arranged in a magnetic field formed by the top permanent magnet and the bottom permanent magnet between the top permanent magnet and the bottom permanent magnet, and the electromagnetic coil is provided with two wiring ends extending to the outside of the cover body.
The pendulum block also comprises a magnetic isolation sleeve and a rigid collision sleeve which are sleeved outside the top permanent magnet in the circumferential direction from inside to outside in sequence.
The multidirectional vibration sensing device further comprises a magnetic shielding sleeve sleeved outside the electromagnetic coil and the bottom permanent magnet, and the cover body is a magnetic shielding shell.
The technical scheme of the data screening and vibration direction judging method is as follows: detecting electrical signal data of a plurality of groups of elastic beams sampled at intervals with set time, setting a threshold value, and discarding the electrical signal data if the electrical signal data in any group are smaller than the threshold value; if only the electric signal data corresponding to two elastic beams in one of the elastic beam pairs is larger than a threshold value and the maximum value alternately appears in any two adjacent groups of effective electric signal data, the direction of the elastic beam pair is the vibration direction of the part to be monitored of the fan; if the electric signal data corresponding to the two elastic beams of each two adjacent elastic beam pairs in any two adjacent sets of effective electric signal data are both greater than the threshold value and alternately have the maximum value, the direction of synthesizing the electric signal data corresponding to the adjacent elastic beam pairs is the vibration direction of the part to be monitored of the fan.
The invention has the beneficial effects that: by data screening, useless electric signal data can be deleted, the data transmission quantity is reduced, the storage pressure of a system database and the working strength of an analysis server are reduced, and the efficiency of a monitoring and analysis system is improved. According to the reserved effective electric signal data, the vibration direction of the fan can be accurately judged, the vibration direction judgment can be carried out on the condition that one pair of elastic beam pairs are triggered, the vibration directions under the condition that two pairs of elastic beam pairs are triggered simultaneously can be synthesized, and the multi-direction vibration monitoring is realized.
Drawings
FIG. 1 is a schematic flow diagram of a fan vibration monitoring system according to the present invention;
FIG. 2 is a schematic diagram of a multi-directional vibration sensing device in an embodiment of a wind turbine vibration monitoring system according to the present invention;
FIG. 3 is a flow chart of data screening and vibration direction determination strategies in an embodiment of a fan vibration monitoring system of the present invention;
FIG. 4 is a schematic diagram of vibration direction determination and data triangulation in an embodiment of a fan vibration monitoring system of the present invention;
fig. 5 is a functional schematic diagram of a monitoring analysis module in an embodiment of the fan vibration monitoring system of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the embodiment of the fan vibration monitoring system of the present invention, as shown in fig. 1 to 5, the fan vibration monitoring system includes a sensing module U1, a signal conditioning circuit U2, a data processing and control module U3, a Zigbee wireless transmission module U4, a centralized processing module U5, a monitoring and analyzing module U6, and a power management circuit U7. The sensing module U1, the signal conditioning circuit U2 and the data processing and control module U3 form a multi-direction vibration sensor of the fan. The Zigbee wireless transmission module U4 includes a terminal transmitting node U41 and a coordinator receiving node U42. The sensing module U1 is a self-powered vibration sensing device, on one hand, a vibration signal of a fan monitoring part is converted into an electric signal, the electric signal is filtered by a signal conditioning circuit U2, subjected to peak holding processing and transmitted to a data processing and control module U3 for AD sampling, threshold value comparison, vibration direction judgment and other processing, then effective data with a vibration direction is transmitted to a terminal transmitting node U41 through an SPI (serial peripheral interface) for wireless transmission, a coordinator receiving node U42 at a receiving end receives the data and transmits the data to a centralized processing module U5 through a serial port, namely a fan main control PLC (programmable logic controller), and the received signal of each vibration monitoring part of the fan is subjected to centralized processing and storage and is transmitted to a monitoring and analyzing module U6 through an optical fiber Ethernet, namely, the monitoring and analyzing server carries out display, storage and fault analysis diagnosis; on the other hand, the sensing module U1 collects vibration energy in the environment and converts the vibration energy into electric energy, and the electric energy is rectified, stored and DC/DC voltage-stabilized by the power management circuit U7 to supply power to the data processing and control module U3 and the terminal transmitting node U41, thereby realizing self-power supply of vibration signal acquisition sensing, processing and transmission.
The sensing module U1 comprises a multidirectional vibration sensing device, wherein the multidirectional vibration sensing device comprises a base 1, a self-powered part 2, a multidirectional vibration sensing part 3 and a magnetic shielding shell 4. The base 1 and the magnetic shielding shell 4 are both circular, and the magnetic shielding shell 4 is a cover body covering the base 1. The central part of base 1 is seted up and is used for the screw hole 101 of being connected with the fan position of waiting to monitor, has a plurality of radial spout 102 along the circumference interval equipartition on base 1.
The self-powered part 2 comprises a bottom permanent magnet 201, an electromagnetic coil 202, a magnetic shielding sleeve 203, a top magnetic part 204 and a tension spring 205, the top magnetic part 204 comprises a top permanent magnet 20401, the top permanent magnet 20401 corresponds to the bottom permanent magnet 201 up and down, and a magnetic isolation sleeve 20402 and a rigid collision sleeve 20403 are sequentially sleeved on the circumferential outer part of the top permanent magnet 20401 from inside to outside. The bottom permanent magnet 201 is fixed at the center of the base 1 and is located in the magnetic shielding sleeve 203, the electromagnetic coil 202 is also fixed in the magnetic shielding sleeve 203, the top magnetic component 204 is installed on the magnetic shielding shell 4 through the tension spring 205, one end of the tension spring 205 is connected with the top magnetic component 204, and the other end is connected with the magnetic shielding shell 4. In this embodiment, the top permanent magnet 20401 and the bottom permanent magnet 201 have opposite magnetic poles (i.e., one of the opposite ends is an N pole and the other is an S pole). The top permanent magnet 20401 is in a dynamic stable state under the dual action of the bottom permanent magnet 201 and the tension spring 205, the top permanent magnet 20401 can vibrate under the excitation of small environmental vibration in any direction, and the top permanent magnet 20401 can pick up broadband vibration in the environment due to the nonlinearity of magnetic force. And because the base 1 and the magnetic shielding shell 4 are installed on the part to be monitored of the fan, the top permanent magnet 20401 is always in a vibration state, and the electromagnetic coil 202 in the magnetic field formed by the top permanent magnet 20401 and the bottom permanent magnet 201 can sense time-varying magnetic flux, thereby outputting electric energy.
In this embodiment, two wire outlet holes 401 are formed in the magnetic shielding shell 4, two terminals of the magnetic coil 202 extend out, and electric energy in the magnetic coil 202 is supplied to the subsequent data processing and control module U3 and the Zigbee wireless transmission module U4 after passing through the rectifier circuit, the energy storage circuit and the DC/DC voltage stabilization, so that self-power supply can be realized without an external power supply and a backup battery.
The multi-direction vibration sensing part 3 comprises 8 force bearing pieces 301 which are uniformly arranged at intervals along the circumferential direction and are respectively named as A1, B1, C1, D1, A2, B2, C2 and D2, in the embodiment, A1 is opposite to A2, B1 is opposite to B2, C1 is opposite to C2, and D1 is opposite to D2, the multi-direction vibration sensing part 3 further comprises the top magnetic part 204 and the tension spring 205, wherein the force bearing pieces 301 comprise elastic beams 30101 which are installed in corresponding radial sliding grooves 102, the elastic beams 30101 are cantilever structures which are arranged in the radial sliding grooves 102, the elastic beams 30101 can slide in the radial sliding grooves 102 to adjust the radial position of the elastic beams 30101, threaded holes 30104 are further formed in the elastic beams 30101, and the elastic beams 30101 can be fixed by screwing and tightening screws in the threaded holes 30104 after the elastic beams 30101 are adjusted to be in place. An end weight 30102 is provided on the outer side of the upper end of the elastic beam 30101, and a piezoelectric sheet 30103 is provided at the root of the elastic beam 30101.
When the magnetic bearing component is used, the position of the bearing component 301 is adjusted, so that the distance between the bearing component 301 and the top magnetic component 204 meets the following requirements: when the fan is in normal use, the force bearing pieces 301 and the top magnetic part 204 do not collide with each other, and when the top magnetic part 204 swings along with the part of the fan to be monitored, the force bearing pieces 301 can collide with one or two adjacent force bearing pieces 301.
In this embodiment, the force bearing members 301 are uniformly distributed at intervals in the circumferential direction around the top magnetic member 204, and the circumferential distance between two adjacent force bearing members 301 should be smaller than the outer diameter of the top magnetic member 204, so that the elastic beam can be impacted no matter the top magnetic member 204 swings in any direction, the distance between the force bearing members 301 should be ensured, and when the top magnetic member 204 swings, at most two force bearing members 301 can be pushed, thereby facilitating subsequent numerical operation. I.e. the outer diameter of the top magnetic part 204 should be less than the sum of the two spacing and the force-bearing part 301.
In this embodiment, the base 1, the bottom permanent magnet 201, the electromagnetic coil 202, the magnetic shielding sleeve 203, the top magnetic part 204 and the magnetic shielding shell 4 are circular, the end weight 30102 and the piezoelectric sheet 30103 in the force bearing member 301 are square, and the base 1, the magnetic shielding sleeve 203, the magnetic isolation sleeve 20402 and the magnetic shielding shell 4 are made of metal aluminum; the end weight 30102 is made of metal lead; the rigid collision sleeve 20403 is made of alloy steel; the elastic beam 30101 is made of beryllium bronze alloy. In the present embodiment, two elastic beams symmetrically arranged about the center constitute an elastic beam pair, and the present embodiment includes four elastic beam pairs.
When the fan is used, when the fan normally runs, a certain distance is kept between the top magnetic part 204 and the force bearing pieces 301 under the action of the tension springs 205, when the part to be monitored of the fan vibrates, the top magnetic part 204 is stressed to generate large deflection, and can directionally collide one or two of the force bearing pieces 301 which are circumferentially distributed in a short time, for example, A1 or A1 or B1, then reversely collide A2 or A2 or B2, then collide A1 or A1 or B1, and the above steps are repeated for a plurality of times. The force bearing pieces A1 or A1, B1 and A2 or A2, B2 deform, the piezoelectric sheet 30103 senses strain and converts vibration signals into electric signals to be output, and the stronger the vibration is, the larger the output voltage signal is; the weaker the vibration, the smaller the output voltage signal. In the operating environment of the fan, even if the force bearing member 301 is not collided by the top magnetic part 204, the force bearing member will have a slight vibration, that is, a slight electric signal is output. These signals are processed by the signal conditioning circuit U2 and then transmitted to the data processing and control module U3. Meanwhile, the data processing and control module U3 can process the voltage signal output by the piezoelectric patch.
The data processing and control module U3 selects a chip MSP430F5438 with low power consumption, multiple I/O ports and strong processing performance. And setting a threshold value s in the module. After the marker is subjected to AD sampling, the data of the force bearing members A1, B1, C1, D1, A2, B2, C2 and D2 are dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2 respectively. The strategy for screening valid data and judging the vibration direction is shown in fig. 3. Taking the example of the top magnetic part 204 hitting a1 or a1, B1, then dA1 or dA1, dB1 should be the largest data in the group. If no data in group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2) is greater than the threshold s, discarding the group 1 data; otherwise, group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2) is saved and whether the group 1 data is valid is determined from the subsequently incoming group 2, group 3, group 4 data. If only dA1 in the group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2) is larger than the threshold s, judging whether the maximum data in the group 2(dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2) is dA2, if so, continuing judging according to the data of the group 3 and the group 4, and if not, regarding the data of the group 1 as invalid data and discarding the data. If the maximum data in group 3(dA1, dB1, dC1, dD1, dA2, dB2, dC2, and dD2) is dA1 and the maximum data in group 4(dA1, dB1, dC1, dD1, dA2, dB2, dC2, and dD2) is dA2, the data in group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, and dD2) is considered valid, and the vibration direction of the monitoring site can be determined to be along the direction of the force-bearing members a1 and a2, and then Zigbee dA1 in group 1 is taken out and the vibration direction is transmitted to the wireless transmission module; otherwise, group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2) data is considered invalid data and discarded. If dA1, dB1 is greater than the threshold s in group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2), then subsequently incoming group 2 data is judged; if more than two data in group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2) are greater than the threshold s, the data of group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2) are considered as invalid data and discarded. If dA2 and dB2 in the group 2(dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2) are larger than the rest data, continuing judging according to the data of the group 3 and the group 4, and if not, regarding the data of the group 1 as invalid data and discarding the invalid data. Group 3(dA1, dB1, dC1, dD 1)dA1 and dB1 as the maximum data in dA2, dB2, dC2 and dD2), and dA2 and dB2 as the maximum data in group 4(dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2), the data of group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2) is considered to be valid, and the vibration direction of dA2 and dB2 in force bearing members a2 and B2, a2 and B2) and the vibration direction of dA2 and dD2 in group 1(dA 2, dB2, dC2, dD2, dA2, dB2, dC 2) can be determined according to the similar principle
Then, dA1 and dB1 in group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2 and dD2) are synthesized into d according to the vibration direction and added with the judged vibration direction
The principle of vibration direction determination and data triangulation is shown in fig. 4. Otherwise, group 1(dA1, dB1, dC1, dD1, dA2, dB2, dC2, dD2) data is considered invalid data and discarded. Setting a threshold value in the module and judging the threshold value through two rounds, on one hand, invalid data can be discarded, and the data volume needing to be transmitted is reduced; on the other hand, the vibration direction can be determined; in addition, errors caused by interference of electromagnetism and the like and ineffective oscillation of the top magnetic part can be effectively avoided by setting the threshold value.
The data transmission part adopts a Zigbee wireless transmission module U4 with low power consumption, low cost and high reliability, and a CC2530 minimum system is selected for both a terminal transmitting node U41 and a coordinator receiving node U42. The terminal transmitting node U41 keeps the sleep mode at ordinary times, wakes up the terminal transmitting node when data needs to be transmitted, and continues to enter the sleep mode after the data transmission is finished. After receiving the data, the coordinator receiving node U42 transmits the data to the centralized processing module U5. The centralized processing module U5 is a fan master control PLC, and performs centralized processing and storage on the received signals of each monitoring part of the fan, and transmits the signals to the monitoring analysis server.
As shown in fig. 5, the functions of the monitoring and analyzing module U6, i.e., the monitoring and analyzing server, include monitoring management and analysis and diagnosis, i.e., displaying, storing and querying received data, and analyzing and diagnosing the vibration condition of the monitored part of the fan according to a test sample library, a fault history library, an expert analysis library, etc.
In this embodiment, the top magnetic member constitutes a pendulum block, which not only functions as a self-power supply, but also functions as an impact on the elastic beam. The magnetic shielding shell forms a cover body, the cover body and the base form a mounting seat, in the embodiment, the elastic beam is arranged on the base, the swing block is suspended on the inner wall of the top end of the cover body through the tension spring, in other embodiments, the positions of the elastic beam and the swing block can be interchanged, or the swing block and the elastic beam are arranged on the base or the cover body.
In other embodiments, if only the elastic beam is impacted, the swinging block can be set as a common impacting block, and the magnetic shielding shell can also be a common cover body.
In the embodiment of the multidirectional vibration sensing apparatus of the present invention, the structure of the multidirectional vibration sensing apparatus is the same as that in the above embodiment, and details are not repeated herein.
The method of the present invention is the same as the above embodiments, and the details thereof are not repeated.
Claims (9)
1. The utility model provides a fan vibration monitoring system, includes multi-direction vibration sensor of fan, data transmission module, fan master control PLC and monitoring analysis server, its characterized in that: the multi-direction vibration sensor of fan includes multi-direction vibration sensing device, and multi-direction vibration sensing device is including being used for installing the mount pad on the fan treats monitoring location, be equipped with the pendulum piece that can treat monitoring location's vibration along with the fan on the mount pad and take place the beat, surround on the mount pad a plurality of elastic beams are right to the pendulum piece has been arranged, and each elastic beam is to all including two elastic beams along central symmetrical arrangement, is equipped with respectively on each elastic beam and takes place deformation and convert the deformation into the piezoelectric patches that correspond the signal of telecommunication when corresponding elastic beam is by the pendulum piece striking, the mount pad is including being used for installing the base that the fan treats monitoring location and the cover body that the fixed cover established on the base, base and cover body go up the branch be equipped with elastic beam and pendulum piece, the pendulum piece through the extension spring suspension in on the top inner wall of the cover body.
2. A fan vibration monitoring system according to claim 1, wherein: the elastic beams are uniformly arranged at intervals along the circumferential direction, the circumferential distance between every two adjacent elastic beams is smaller than the outer diameter of the swinging block, and the outer diameter of the swinging block is smaller than the sum of the circumferential distance and the circumferential size of the elastic beams.
3. A fan vibration monitoring system according to claim 2, wherein: a plurality of radial sliding grooves are arranged on the mounting seat at intervals along the circumferential direction, and the radial position of each elastic beam is adjustably arranged in each radial sliding groove.
4. A fan vibration monitoring system according to claim 1, wherein: one end of the elastic beam is arranged on the mounting seat, the other end of the elastic beam is a free end, an end weighting block is arranged on one side of the free end, which deviates from the swinging block, and the root of the elastic beam is provided with the piezoelectric patches.
5. The fan vibration monitoring system according to any one of claims 1 to 4, wherein: the multi-direction vibration sensing device comprises a base, a top permanent magnet and a bottom permanent magnet, wherein the top permanent magnet is suspended on the inner wall of the top end of the cover body, the bottom permanent magnet is arranged on the base and vertically corresponds to the top permanent magnet, an electromagnetic coil is arranged in a magnetic field formed by the top permanent magnet and the bottom permanent magnet between the top permanent magnet and the bottom permanent magnet, and the electromagnetic coil is provided with two wiring ends extending to the outside of the cover body.
6. The fan vibration monitoring system of claim 5, wherein: the pendulum block also comprises a magnetic isolation sleeve and a rigid collision sleeve which are sleeved outside the top permanent magnet in the circumferential direction from inside to outside in sequence.
7. The fan vibration monitoring system of claim 5, wherein: the multidirectional vibration sensing device further comprises a magnetic shielding sleeve sleeved outside the electromagnetic coil and the bottom permanent magnet, and the cover body is a magnetic shielding shell.
8. A multi-directional vibration sensing device, comprising: the multidirectional vibration sensing apparatus as claimed in any one of claims 1 to 7.
9. The method for data screening and vibration direction judgment according to the multidirectional vibration sensing apparatus of claim 8, wherein: detecting electrical signal data of a plurality of groups of elastic beams sampled at intervals with set time, setting a threshold value, and discarding the electrical signal data if the electrical signal data in any group are smaller than the threshold value; if only the electric signal data corresponding to two elastic beams in one of the elastic beam pairs is larger than a threshold value and the maximum value alternately appears in any two adjacent groups of effective electric signal data, the direction of the elastic beam pair is the vibration direction of the part to be monitored of the fan; if the electric signal data corresponding to the two elastic beams of each two adjacent elastic beam pairs in any two adjacent sets of effective electric signal data are both greater than the threshold value and alternately have the maximum value, the direction of synthesizing the electric signal data corresponding to the adjacent elastic beam pairs is the vibration direction of the part to be monitored of the fan.
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| CN201810805982.XA CN109026553B (en) | 2018-07-20 | 2018-07-20 | Vibration sensing device, data screening and direction judging method and fan monitoring system |
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| CN201810805982.XA CN109026553B (en) | 2018-07-20 | 2018-07-20 | Vibration sensing device, data screening and direction judging method and fan monitoring system |
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| CN201448194U (en) * | 2009-06-08 | 2010-05-05 | 山东长星集团有限公司 | Fan vibration monitoring device based on information fusion technology |
| CN201488805U (en) * | 2009-09-02 | 2010-05-26 | 成都科鑫电气有限公司 | Piezoelectric type omnibearing vibration sensor |
| MY164500A (en) * | 2011-07-25 | 2017-12-29 | Mimos Berhad | A piezoresistive accelerometer |
| WO2016097222A1 (en) * | 2014-12-18 | 2016-06-23 | Innalabs Limited | Gyroscope |
| CN206945127U (en) * | 2017-07-11 | 2018-01-30 | 国电联合动力技术有限公司 | Intelligent output type vibration monitoring device and the system including the device |
| CN107817365A (en) * | 2017-11-28 | 2018-03-20 | 吉林大学 | A kind of self-powered 3-axis acceleration sensor and detection method |
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