JPH1078350A - Monitoring method and system for examining facilities of air blower in tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an accurate facility examination for a facility abnormality and a secular change or the like without being affected by a disturbance factor (such as a swing of an air blower by wind pressure and a strong wind or the like when a large vehicle passes) proper to an air blower in a tunnel as well as to accurately detect abnormality of a support device of the air blower. SOLUTION: A vibration signal A detected by a sensor 1 is separated into a vibration component B of a frequency area influenced by disturbance and a vibration component C except for the frequency area of disturbed vibration by a vibration component separating means 2. A signal D to show the existence of influence of disturbance is generated by a disturbance existence judging unit 3 and a pulse generator 4 on the basis of the vibration component B. When equipment abnormality of an air blower as a rotating machine is diagnosed, the vibration component C in a disturbance noninfluential period is analyzed, and when abnormality of a support device of the air blower is diagnosed, the vibration component B in a disturbance influential period is analyzed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring method and a system for accurately diagnosing equipment such as equipment abnormality and aging deterioration of a blower in a tunnel.

[0002]

2. Description of the Related Art Conventionally, maintenance of a ventilation fan for a tunnel installed in an automobile tunnel or the like has been performed by periodic repairs and replacements performed at regular intervals called time-based maintenance. No decision has been made on the timing of maintenance based on the progress of aging.

[0003] In general, various methods have been proposed as equipment diagnosis methods for rotating machines including blowers and the like. For example, Japanese Patent Application Laid-Open No. Sho 56-42113 discloses a technique in which shaft vibration of a rotating machine is frequency-analyzed and an abnormality is detected from the component ratio of the harmonic component and the amplitude value of the shaft vibration. FIG. 1 shows a configuration of a typical conventional vibration diagnostic device for a rotating machine. This vibration diagnostic device includes a vibration acceleration sensor 91, an integrator 92 that converts the vibration acceleration detected by the vibration acceleration sensor 91 into a vibration speed, and a high frequency component of the vibration acceleration detected by the vibration sensor 91. A high-pass filter 93 and an envelope processing unit 9 for performing an envelope process on an output of the high-pass filter 93
4 and a diagnostic data processing device 96 having an A / D converter 95 on the input side. In this vibration diagnosis device, the diagnosis data processing device 96 can manage the amplitude value at the vibration speed output from the integrator 92 and the like to detect an abnormality related to the mechanism. It is possible to detect foreign object interference and abnormality of gears by managing the amplitude value of acceleration and the like, and to manage the amplitude value and the like after passing through the high-pass filter 93 and the envelope processing unit 94 by performing trend management. An abnormality of the gear can be detected.

Further, Japanese Patent Application Laid-Open No. 57-1926 discloses a technique for accurately diagnosing a rotating machine whose rotational speed fluctuates by sequentially switching filters according to the rotating speed of the rotating machine. Japanese Patent Laying-Open No. 3-148035 discloses that in a diagnostic apparatus which previously required both a vibration acceleration sensor and an AE (acoustic emission) sensor, only a vibration acceleration sensor was used by using a band-pass filter and a high-pass filter. With the use of
A diagnostic device having the same function as that provided with both a vibration acceleration sensor and an AE sensor is disclosed.

[0005]

With a blower in a tunnel installed in a tunnel for automobiles and the like, in particular, a blower in a tunnel with a suspension structure using a plurality of turnbuckle-shaped support devices, a large vehicle passes through the tunnel. Since the blower main body shakes due to the wind pressure or strong wind generated at the time of performing the diagnosis, accurate diagnosis cannot be performed when the above-described conventional diagnostic device is used. That is, every time the blower body shakes due to the passage of a large vehicle or strong wind, the free vibration generated by the suspension structure increases, and the vibration amplitude effective for diagnosis of the device decreases. If it is used, the accuracy of abnormality detection is reduced, and an erroneous diagnosis result is obtained.

[0006] In addition, in the case of a fan in a tunnel with a suspended structure, there is a demand to detect an abnormality of a supporting device. Is detected, it is not possible to take out only the abnormal vibration of the support device of the blower that occurs irregularly, and there is also a problem that the detection sensitivity is extremely low. When the technology of Japanese Patent Application Laid-Open No. 56-42113 is applied to a blower in a tunnel, disturbance vibration generated by passage of a large vehicle or by strong wind fluctuates the component ratio of harmonic components and the amplitude value of shaft vibration. , The detection accuracy of the abnormality is reduced. The diagnostic apparatuses disclosed in JP-A-57-1926 and JP-A-3-14835 each have a filter (for a frequency component), but have a configuration capable of separating the influence of irregularly generated disturbance. Therefore, the detection accuracy of the abnormality is reduced.

[0007] The present invention does not require a separate sensor for detecting the passage of a large vehicle or a change in wind force for a blower in a tunnel, which cannot obtain sufficient accuracy with the conventional diagnostic apparatus, without disturbing. It is an object of the present invention to provide a facility diagnosis monitoring method and system capable of maintaining the original diagnostic accuracy of a rotating machine when there is no factor. It is another object of the present invention to provide a facility diagnosis monitoring method and system capable of accurately detecting an abnormality of a support device specific to a blower in a tunnel without separately providing a sensor other than a sensor for abnormality diagnosis of a rotating machine.

[0008]

According to a first aspect of the present invention, there is provided a method for monitoring equipment for a blower in a tunnel, wherein the vibration of the blower is detected, and the detected vibration is a vibration in a frequency domain due to a disturbance factor. The vibration component is separated into a second vibration component which is a vibration generated by the rotation of the blower, the first vibration component is detected to determine the presence or absence of a disturbance factor, and the vibration during a period in which no disturbance factor is present is analyzed. Diagnose the equipment of the blower.

A second aspect of the present invention relates to a method for monitoring equipment for a blower in a tunnel, the method being directed to a blower mounted in a tunnel via a support device, wherein the vibration of the blower is detected, and the detected vibration is detected. A first vibration component that is a vibration in a frequency domain due to a disturbance factor and a second vibration component that is a vibration generated by rotation of the blower are separated, and the first vibration component is analyzed to detect an abnormality of the support device. .

The monitoring system for diagnosing equipment of a blower in a tunnel according to the present invention comprises a vibration detecting means for detecting vibration of the blower, and a first vibration component which is a vibration in a frequency domain caused by a disturbance factor. And a vibration component separation unit that separates the vibration component into a second vibration component that is a vibration generated by rotation of the blower.

According to the present invention, after detecting the vibration of the blower in the tunnel, the vibration is first converted into a first vibration component which is a vibration in a frequency domain due to a disturbance factor and a second vibration which is a vibration generated by rotation of the blower. Separate into components. Generally, the frequency range of vibration due to a disturbance factor is relatively low, and the frequency range of vibration due to rotation of the blower is relatively high, so that this vibration component separation can be easily performed. When the equipment diagnosis of the blower as the rotating machine is performed, first, the first vibration component is detected to determine the presence or absence of a disturbance factor, and the vibration during the period in which it is determined that the disturbance factor does not exist (particularly the second vibration component). By analyzing (vibration component 2), vibration data when a disturbance factor is generated is removed from the analysis target, and a decrease in diagnostic accuracy due to a large vehicle passing or a blower caused by strong wind is avoided.
On the other hand, when detecting an abnormality of the support device unique to the blower in the tunnel, only the first vibration component may be analyzed (for example, the amplitude and the natural frequency of the first vibration component may be managed in a tendency). By performing such an analysis,
The accuracy of detecting an abnormality of the support device can be improved.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a configuration diagram showing a signal processing flow in the monitoring system for facility diagnosis of the blower in the tunnel according to the embodiment of the present invention.

On the output side of a sensor 1 such as a vibration acceleration sensor which is a vibration detecting means for detecting the vibration of the blower, a vibration component separating means 2 comprising a filter is provided, and a vibration signal A detected by the sensor 1 is provided. Means vibration component separation means 2
The vibration component B in the frequency domain affected by disturbance
And a vibration component C outside the frequency range of the disturbance vibration. These vibration components B and C are both input to the diagnostic data processing device 5. In particular, the vibration component B in the frequency domain of the disturbance is also input to the disturbance presence / absence determiner 3, and the influence of the disturbance occurs. Is used to determine if A pulse generator 4 is provided on the output side of the disturbance presence / absence determining unit 3. The pulse generator 4 generates a signal D indicating the presence or absence of the influence of the disturbance, and inputs the signal D to the diagnostic data processing device 5.

When diagnosing an equipment abnormality of a blower as a rotating machine, the diagnostic data processing unit 5 calculates and analyzes a vibration component C in a period in which there is no influence of disturbance by a signal D from a pulse generator 4. I do. On the other hand, when diagnosing an abnormality of the support device of the blower, the diagnostic data processing device 5 calculates and analyzes the vibration component B in a period under the influence of the disturbance by the signal D.

In this embodiment, the presence / absence of a disturbance, that is, the presence / absence of a large vehicle or a strong wind is detected by signal processing in the disturbance presence / absence determination unit 3 and the pulse generator 4. And providing the pulse generator 4 instead of
A method of extracting a spectrum in a disturbance frequency band from the frequency-converted vibration data signal and determining whether or not the influence of the disturbance is occurring based on the power level or area of the spectrum may be used. It is also possible to detect the presence or absence of disturbance using a traffic measurement device and an anemometer capable of recognizing large vehicles, but in this case, it is necessary to install another sensor. It is expensive and disadvantageous.

[0016]

Hereinafter, the present invention will be described in more detail with reference to specific examples. FIG. 3 is a block diagram showing the configuration of the monitoring system for equipment diagnosis according to the first embodiment.

Here, a piezoelectric vibration acceleration sensor is used as the vibration acceleration sensor 11 attached to the blower. The output of the vibration acceleration sensor 11 is amplified by a charge amplifier (charge amplifier) 12, and the vibration acceleration is integrated. The vibration speed A is input to an integrator 13 for calculation. The output of the charge amplifier 12 is also input to the A / D converter 17. The output (vibration velocity A) of the integrator 13 is branched into two and input to the low-pass filter 14 and the high-pass filter 15, respectively. The output of the high-pass filter 15 is a vibration component C in the frequency domain that is not affected by disturbance factors, and is output from the A / D converter 17.
Enter it as is. On the other hand, the output of the low-pass filter 14 is a vibration component B in a disturbance frequency region, which is represented by A /
The signal is input to the D converter 17 and also to the pulse generator 16. The pulse generator 16 determines the presence or absence of a disturbance factor by comparing the level of the vibration component B with a preset reference value, and outputs a signal D indicating the presence or absence of the disturbance factor. The pulse generator 16 can adjust the pulse generation time of the signal D when there is an influence of disturbance to an appropriate time by a preset timer.

In the monitoring system for equipment diagnosis, the diagnostic data processing device 18 includes one personal computer 1
9. The signal D is input from the pulse generator 16 to the diagnostic data processing device 18, and the vibration acceleration data from the charge amplifier 12 and the vibration component B from the low-pass filter 14 are input through the A / D converter 17. And the data of the vibration component C from the high-pass filter 15 are input. The diagnostic data processing device 18 diagnoses foreign object interference and bearings based on the vibration acceleration, diagnoses the support device of the blower based on the vibration component B when there is disturbance, and the vibration component C when there is no disturbance. Diagnosis of mechanical abnormality of the blower is mainly performed based on. Here, the diagnosis of these three items is performed using one diagnostic data processing device 18, but a diagnostic data processing device may be separately prepared for each item.

Next, the operation of this embodiment will be described.

The vibration acceleration detected by the vibration acceleration sensor 11 is amplified by the charge amplifier 12, input to the diagnostic data processing device 18 via the A / D converter 17, and is output by the integrator 13 to the mechanical abnormality. Is converted into a vibration velocity A which is advantageous for detecting the signal, and is input to the low-pass filter 14 and the high-pass filter 15. Low-pass filter 1
The fourth and high-pass filters 15 respectively extract a vibration component B having a frequency affected by disturbance and a vibration component C other than the frequency of disturbance vibration.

FIG. 4 is a diagram showing an example of changes in vibration speed A, vibration component B and vibration component C when a large vehicle passes through the tunnel. The pulse generator 16 has a vibration component B
Is determined based on a preset reference value, and a signal D indicating the presence or absence of the influence of the disturbance is generated. As a result, the diagnostic data processing device 1
8 is A / D only when there is no influence of disturbance due to the signal D.
The vibration component C after the conversion is calculated, and the equipment abnormality of the blower is diagnosed. In addition, the diagnostic data processing device 18
Only when there is an influence of disturbance, the vibration component B after A / D conversion is calculated to diagnose the abnormality of the support device of the blower. In addition,
When diagnosing the support device in the blower, since the vibration due to disturbance is used, the data variability increases due to factors such as the shape and speed of the passing large vehicle, so compared to the case of diagnosing other items Need to sample more data.

Although the first embodiment of the present invention has been described above, a large swing at a specific frequency may occur due to disturbance depending on the support structure of the blower. In such a case, the low-pass filter is used. Alternatively, a band-pass filter and a band-stop filter may be used instead of the high-pass filter and the high-pass filter, respectively.

Next, a second embodiment of the present invention will be described with reference to FIG. The equipment monitoring system shown in FIG. 5 uses a digital signal processing to perform a low-pass filter,
It is intended to realize a high-pass filter and a pulse generator. Therefore, the first embodiment differs from the first embodiment in that a diagnostic data processing device 28 is built in a personal computer 29 and a low-pass filter 24, a high-pass filter 25 and a pulse generator 26 are provided as digital signal processing elements. , A / D converter 27 is provided between the output of the integrator 13 and the personal computer 19. With such a system configuration, the system can be provided at a lower cost than the system of the first embodiment.

[0024]

As described above, the present invention separates a vibration into a component due to disturbance and a component not due to disturbance, so that only a vibration sensor for diagnosing equipment of a rotating machine can be used as a blower in a tunnel as a rotating machine. It is possible to perform the facility diagnosis with the original diagnostic accuracy, and it is possible to accurately detect the abnormality of the support device specific to the blower in the tunnel. Specifically, in the blower in the tunnel, according to the present invention, the vibration amplitude having a variation of about twice or more as compared with the normal state in the conventional diagnostic apparatus represented by FIG. 1 is suppressed to about 1.3 times or less according to the present invention. This makes it possible to secure the original diagnostic accuracy. Furthermore, without using a dedicated sensor and ancillary equipment to detect the passage of large vehicles and the presence or absence of strong winds, the use of a vibration sensor for diagnosis detects the passage of large vehicles and the presence or absence of strong winds. There is an advantage that both running costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a general vibration diagnosis device for detecting an abnormality of a rotating machine.

FIG. 2 is a configuration diagram showing a signal processing flow in the monitoring system for facility diagnosis of the blower in the tunnel according to the embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a monitoring system for equipment diagnosis according to the first embodiment;

FIG. 4 is a diagram showing a relationship among a vibration speed A, vibration components B and C, and a signal D.

FIG. 5 is a block diagram illustrating a configuration of a facility diagnosis monitoring system according to a second embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor 2 Vibration component separation means 3 Disturbance presence / absence judgment device 4,16,26 Pulse generator 5,18,28 Diagnostic data processing device 11 Vibration acceleration sensor 12 Charge amplifier 13 Integrator 14,24 Low-pass filter 15,25 High Band-pass filter 17,27 A / D converter 19,29 Personal computer

Claims (5)

[Claims] 1. A monitoring method for facility diagnosis of a blower in a tunnel, comprising detecting a vibration of the blower, and generating the detected vibration by a first vibration component which is a frequency domain vibration due to a disturbance factor and rotation of the blower. The vibration is separated into a second vibration component, which is a vibration that occurs, and the first vibration component is detected to determine the presence or absence of a disturbance factor, and the vibration in a period in which no disturbance factor is present is analyzed to perform equipment diagnosis of the blower. , Monitoring method for equipment diagnosis of blower in tunnel. 2. A monitoring method for facility diagnosis of a blower in a tunnel mounted in a tunnel via a supporting device, wherein the vibration of the blower is detected, and the detected vibration is a vibration in a frequency domain due to a disturbance factor. Separating into a first vibration component and a second vibration component which is vibration generated by rotation of the blower, and analyzing the first vibration component to detect an abnormality of a support device, for equipment diagnosis of a blower in a tunnel. Monitoring method. 3. A monitoring system for facility diagnosis of a blower in a tunnel, comprising: a vibration detecting means for detecting vibration of the blower; and a first vibration component which is a vibration in a frequency domain caused by a disturbance factor. And a vibration component separation unit that separates the vibration component into a second vibration component that is a vibration generated by rotation of the blower. 4. A disturbance detecting means for detecting the first vibration component to determine the presence or absence of a disturbance factor, wherein the vibration detecting means in a period in which the disturbance determining means determines that there is no disturbance factor. The monitoring system for facility diagnosis of a blower in a tunnel according to claim 3, wherein facility diagnosis is performed using data of the detected vibration. 5. The monitoring system for facility diagnosis of a blower in a tunnel according to claim 3, wherein facility diagnosis is performed by monitoring the first vibration component.