JPH10333742A - Oscillation diagnostic device for rotary body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve diagnostic efficiency by accurately detecting abnormal oscillation that fine oscillation change is continued and abnormal oscillation that increase or decrease is cyclically repeated. SOLUTION: This oscillation diagnosing device is provided with an oscillation data processing part 4, oscillation change accumulation data preserving part 12, and oscillation change accumulation processing part 14. The oscillation data processing part 4 calculates oscillation amplitude, order rate analysis, oscillation amplitude increase rate, oscillation vector change rate, and oscillation amplitude change rate. The oscillation change accumulation data preserving part 12 preserves the calculated oscillation amplitude change rate in an oscillation change accumulation file 13. The oscillation change accumulation processing part 14 performs the cumulative operation of the absolute value of the oscillation amplitude change rate data preserved in the file 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body vibrating apparatus, and more particularly to a method for accurately detecting abnormal vibration in which a minute amplitude change continues and abnormal vibration repeatedly increasing and decreasing to improve diagnostic accuracy. The present invention relates to a rotating body vibration diagnostic device.

[0002]

2. Description of the Related Art Vibration monitoring is one of important monitoring items for determining the presence or absence of an abnormality in a large rotating machine such as a steam turbine, a gas turbine generator, and a pump. Various monitoring methods are used, from simple amplitude value monitoring to abnormal vibration monitoring for each vibration component by frequency analysis. Various methods are also used for the vibration diagnostic device, but a threshold value is individually set for the vibration amplitude value and the vibration order ratio component value,
When these instantaneous values exceed the threshold value, it is judged that they deviate from the permissible vibration level, and those that judge that they are abnormal, or those that perform abnormality diagnosis using a matrix using the vibration amplitude value and vibration order ratio component General.

FIG. 11 shows a typical example of a rotating body vibration diagnosis apparatus. The amount of vibration detected from an electrokinetic sensor, a displacement sensor, or the like that detects the shaft vibration of the turbine / generator 1 is input to a vibration data input unit 2, and the vibration data processing unit 4 analyzes the vibration amplitude / order ratio / vibration amplitude increase rate. A calculation process for determining the vibration vector change rate is executed. On the other hand, the process state quantity of the power plant related to the vibration such as the load, the number of rotations, and the degree of vacuum of the condenser is input to the process data input unit 3, and the operation state determination unit 5 determines whether the rotation is increasing or the load is running. Calculation processing for determining the operating state is performed.

[0004] Further, the abnormality detection unit 6 calculates the vibration amplitude, the order ratio component, the vibration amplitude increase rate, and the vibration vector change rate data calculated by the vibration data processing unit 4 and the operation state obtained by the operation state determination unit 5. Each time, a predetermined threshold value for abnormality determination is compared to determine whether there is an abnormality. The data storage unit 7 determines the storage destination of the data processed by the vibration data processing unit 4 and the data relating to the process state value input by the process data input unit 3 in accordance with the abnormality determination result of the abnormality detection unit 6. Is stored only in the normal data file 8, and when there is an abnormality, it is stored in both the normal data file 8 and the abnormal data file 9.

The abnormality cause diagnosing unit 10 compares the characteristic of the vibration with the matrix in which the characteristic of the vibration is classified according to the cause of the abnormality in advance, and determines the one having a large number of matching items as the abnormality cause. The data display unit 11 performs processing for graphing these data and displays them as a graph. The displayed graphs are, for example, a rotation speed-amplitude diagram (a), a polar diagram (b), and a time-amplitude diagram as shown in FIGS. 12 (a), (b), (c), (d), and (e). (C), a frequency-amplitude diagram (d), and a Lissajous diagram (e).

[0006]

The above-described abnormality determination by the rotating body vibration diagnosis apparatus determines whether the vibration amplitude value and each vibration order ratio component value exceed predetermined threshold values based on one measured data, for example. And whether or not the vibration amplitude change amount and the vibration vector change amount for several seconds have exceeded a predetermined threshold based on two data obtained by combining the data measured this time with the previous time. If the threshold value is exceeded, it is a method of determining that an abnormality has occurred. If it is determined that an abnormality has occurred, the diagnostic result is derived in accordance with the number of matching items by comparing the characteristic of the vibration with a matrix in which the characteristics of vibration are classified in advance. This is a method depending on the instantaneous value.

In the method depending on the instantaneous value, for example, abnormal vibrations that change relatively slowly in several minutes or tens of minutes and abnormal vibrations in which minute amplitude changes are continuous have particularly large instantaneous values of the vibration amplitude. Apart from the case, there is no other way than the operator can make a judgment on the monitoring graph.

In addition, since data is stored for a certain period of time irrespective of the content of the abnormality when abnormal vibration occurs, when the operator determines, for example, an instantaneous change based on the content of the abnormality, the data in the abnormal data file 9 is stored. Part of the data must be called up and displayed in an enlarged manner. When abnormal data whose amplitude changes slowly is viewed, there is a problem that the data amount is insufficient and the change in amplitude cannot be confirmed.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the diagnostic accuracy by accurately detecting an abnormal vibration in which a minute amplitude change continues and an abnormal vibration which periodically increases and decreases, and to store and store data in accordance with the contents of the abnormality. It is an object of the present invention to provide a rotating body vibration diagnosis device capable of displaying.

[0010]

According to a first aspect of the present invention, there is provided a method for storing vibration rate change rate data calculated by a vibration data processing unit in a predetermined file over a predetermined period of time in the past. A change accumulation data storage unit,
And a vibration change accumulating unit that calculates an absolute value of the vibration amplitude change rate based on the data stored in the file.

In the vibration diagnostic apparatus having the above-described configuration, the absolute value of the vibration amplitude change is accumulated, and abnormality is detected by comparing the obtained vibration amplitude change rate with an abnormality determination threshold value for each operating state. Can be diagnosed.
Accordingly, a minute and continuous change in vibration can be detected, and it is possible to grasp a precursor of the vibration caused by the oil whip.

Further, the invention according to claim 2 is a vibration change period data storage unit for storing the vibration amplitude data calculated by the vibration data processing unit in a predetermined file for a predetermined period of time in the past, and data stored in the file. A vibration change cycle calculation processing unit that performs a frequency analysis based on the vibration amplitude and calculates a change cycle of the vibration amplitude, and a periodic change amount of the vibration amplitude calculated by the vibration change cycle calculation processing unit and a driving state determination unit. An abnormality detection unit that determines the presence or absence of an abnormality by comparing a predetermined amount of change in the vibration amplitude cycle with an abnormality determination threshold value for each operating state; An abnormality cause diagnosing unit that identifies an abnormality cause by comparing the change with a matrix that includes the change in the item of the abnormality cause is provided.

[0013] The vibration diagnostic apparatus having the above-described structure can detect a periodic fluctuation of the vibration amplitude value. The generated abnormal vibration can be easily located.

According to a third aspect of the present invention, there is provided an abnormality determination data storage unit for storing the storage cycle and period of the abnormality data in several types in accordance with the detected contents from the abnormality determination result in the abnormality detection unit. Is what you do.

In the vibration diagnosing apparatus having the above-described structure, the data is stored in the respective abnormal data files according to the detection content that caused the vibration, so that a waste of data search time can be eliminated. Further, the cause of the abnormality can be accurately specified by using data having no excess or deficiency.

Further, the invention according to claim 4 is provided with an abnormality graph display switching unit for switching so as to display the cycle and the period of the display data in several types in accordance with the detection content from the abnormality determination result in the abnormality detection unit. It is a feature.

In the vibration diagnostic apparatus having the above-described configuration, it is possible to display the data in an optimal graph format according to the detection content, and it is possible to eliminate excessive data display and insufficient display of data necessary for diagnosis.

The invention according to claim 5 is characterized in that the apparatus further comprises an abnormality graph display line color switching unit for switching the display to a predetermined line color according to the detection content from the abnormality determination result in the abnormality detection unit. Is what you do.

In the vibration diagnostic apparatus having the above configuration, the abnormality and the detection state can be estimated at a glance, and the state of the vibration can be accurately grasped.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, a vibration data processing unit 4 executes not only a vibration amplitude / order ratio analysis, an arithmetic process for a vibration amplitude increase rate / a vibration vector change rate, but also a vibration amplitude change rate. Calculate the rate. The vibration change accumulation data storage unit 12 stores the calculated vibration amplitude change rate in the vibration change accumulation file 13. This vibration change accumulation file 13 is stored in a first-in first-out (FI
The change rate of the vibration amplitude is stored for a fixed time by the FO) method.

Further, the vibration change accumulating unit 14 accumulatively calculates the absolute value of the vibration amplitude change rate data stored in the vibration change accumulation file 13 as in the following equation (1).

[0023]

(Equation 1)

Here, n: number of data ΔV: rate of change in vibration amplitude The abnormality detection unit 6 calculates the vibration amplitude, each order ratio component, the rate of increase in vibration amplitude, and the change in vibration vector calculated by the vibration data processing unit 4. The vibration rate change data obtained by the vibration change accumulating unit 14 and the operating state obtained by the operating state determination unit 5 are compared with the rate data and a threshold value for abnormality determination predetermined for each operating state. Each time, a predetermined threshold value for abnormality determination is compared to determine whether there is an abnormality.

Further, the data storage unit 7 determines a storage destination according to the result of the abnormality determination, and stores the data in only the normal data file 8 when there is no abnormality, and stores the data in both the normal data file 8 and the abnormal data file 9 when there is an abnormality. save. Further, the abnormality cause diagnosis unit 10 determines the cause of the abnormality by collating with the matrix including the vibration amplitude change rate in the item of the cause of the abnormality.
Further, the data display unit 11 performs a process for graphing these data and displays the data as a graph.

The abnormality determination in the abnormality detector 6 of the present embodiment is based on a comparison between the vibration amplitude change rate data by the vibration change accumulator 14 and the abnormality determination threshold by the operating state determiner 5. This process proceeds as follows. That is, in FIG. 2A, the vibration change accumulating file 1
The vibration change accumulating unit 14 executes an arithmetic operation for obtaining an absolute value based on the 100 vibration amplitude change rate data stored in the third unit. On the other hand, the operation state determination unit 5 determines that the load operation is being performed based on the process state value, and determines the abnormality determination threshold value at that time.

The obtained rate of change in vibration amplitude and the threshold value for abnormality determination are compared in the abnormality detection unit 6, and if equal to or larger than the threshold value, it is determined that there is an abnormality, and If smaller, it is determined that there is no abnormality.

In this embodiment, it is possible to detect a minute and continuous change in vibration when there is no change in the operation state (see FIG. 2B), and to grasp the precursor of the vibration caused by the oil whip. Is possible.

(Embodiment 2) Further, another embodiment of the present invention will be described. In FIG. 3, a vibration change cycle data storage unit 15, a vibration change cycle calculation file 16, and a vibration change cycle calculation processing unit 17 are provided together with the components of the above embodiment. Vibration change cycle data storage unit 1
5 stores the vibration amplitude value in the vibration change period calculation file 16 among the data processed by the vibration data processing unit 4.

Further, the vibration change cycle calculation processing section 17 performs a frequency analysis based on the stored data to calculate a change cycle of the vibration amplitude. Here, a frequency analysis is performed for several hours of the vibration amplitude, and a vibration amplitude change amount in a period of several minutes to several tens minutes is obtained. Further, the abnormality detecting section 6 compares the data such as the vibration amplitude calculated by the vibration data processing section 4 with a threshold value for abnormality determination which is predetermined for each operation state. The cycle change amount of the calculated vibration amplitude is compared with a threshold value for abnormality determination of the change amount of the vibration amplitude change period predetermined for each operation state obtained by the operation state determination unit 5 to determine whether there is an abnormality. judge.

The data storage unit 7 determines a storage destination according to the result of the abnormality determination, and stores the data in only the normal data file 8 when there is no abnormality, and stores the data in both the normal data file 8 and the abnormal data file 9 when there is an abnormality. save.

The abnormality determination in the abnormality detecting section 6 is based on a comparison between the vibration amplitude change amount data by the vibration change cycle calculation processing section 17 and the abnormality determination threshold value by the driving state determining section 5 as follows. proceed. That is, in FIG.
Based on the 128 vibration amplitude data stored in the vibration change period calculation file 16, the vibration change period calculation processing unit 17
Performs a frequency analysis to calculate a change period of the vibration amplitude.

On the other hand, the operating state determining section 5 determines that the load is being operated based on the process state value, and determines a threshold value for determining the abnormality. The obtained vibration amplitude change amount and the abnormality determination threshold value are compared in the abnormality detection unit 6, and if it is larger than the threshold value, it is determined that there is an abnormality, and if it is smaller than the threshold value, it is determined that there is no abnormality.

In the present embodiment, the periodic fluctuation of the vibration amplitude value can be grasped by obtaining the vibration amplitude change amount that increases and decreases at a constant cycle and compares it with the abnormality determination threshold value. It is possible to easily find the cause of abnormal vibration such as rubbing.

(Embodiment 3) Another embodiment of the present invention will be described. In FIG. 5, an abnormal state determination data storage unit 18 and an abnormal data file 19 composed of a plurality of files are provided together with the components of the second embodiment. When detecting an instantaneous change in vibration in each data format according to the detection content, the abnormal data file 19 stores data for a period of 10 seconds for one hour, and detects a change in periodic vibration such as rubbing. At that time, data of a 10-minute cycle is stored for 12 hours.

The abnormal state determination data storage unit 18 determines a storage destination based on the result of the abnormality determination by the abnormality detection unit 6, and stores the data in an abnormal data file 19 having each data format.

This process proceeds as follows. That is, in FIG. 6, when the abnormality determination result is determined to be rubbing, the abnormal state determination data storage unit 18 stores the data of the 10-minute cycle for a predetermined number of data (120 in the figure), and the abnormality determination result is instantaneous. Sudden change of typical vibration
For the data in the second cycle, the specified number of data is stored.

In this embodiment, since the abnormality data file 19 is stored in each abnormality data file 19 in accordance with the content of the abnormality that caused the vibration, the access to the target data is quickened.
Waste of data search time and the like can be eliminated. Further, it is possible to accurately specify the cause of the abnormality by using data having no excess or deficiency.

(Embodiment 4) Another embodiment of the present invention will be described. In FIG. 7, an abnormal graph display switching unit 20 is provided together with the components of the third embodiment. The abnormal graph display switching unit 20 displays the graph in an optimal graph format according to the detection content. For example, when an instantaneous sudden change in vibration is detected, 1 is displayed.
The scale can be switched to a graph in which time is a full scale, and when a change in periodic vibration such as rubbing is detected, the scale can be switched to a graph in which 12 hours are a full scale.

This process proceeds as follows. That is, in FIG. 8, when it is determined that the abnormality determination result is rubbing, the abnormal state determination data storage unit 18 stores the data of the 10-minute cycle for a predetermined number of data, and the abnormality graph display switching unit 20 further operates for 20 hours. Switch the scale so that is displayed as full scale.

In the present embodiment, the data can be displayed in an optimal graph format in accordance with the detection content, and it is possible to eliminate excessive data display and insufficient display of data necessary for diagnosis.

(Embodiment-5) Further, another embodiment of the present invention will be described. In FIG. 9, together with the respective configurations of the third embodiment, the abnormal graph display line color switching unit 2
1 is provided. This abnormal graph display line color switching unit 2
Reference numeral 1 denotes a line color graph displayed according to the detection content. For example, the line color is displayed in red when a sudden change in vibration is detected, and in purple when a change in periodic vibration due to rubbing or the like is detected. I do.

This process proceeds as follows. That is, in FIG. 10, when it is determined that the abnormality determination result is rubbing, the abnormal state determination data storage unit 18 stores the data of a 10-minute cycle for a predetermined number of data, and further, the abnormality graph display line color switching unit 21 sets a purple color. The displayed line color is switched so as to display.

In the present embodiment, it is possible to estimate the abnormality detection situation at a glance by changing the displayed line color, there is little possibility of erroneous recognition, and it is possible to accurately grasp the state of vibration. it can.

[0045]

As described above, according to the first aspect of the present invention, a minute and continuous change in vibration can be detected.
It is possible to grasp the precursor of the vibration caused by the oil whip.

Further, according to the second aspect of the present invention, it is possible to detect a periodic fluctuation of the vibration amplitude value, and it is possible to easily detect abnormal vibration caused by rubbing or the like.

Further, according to the third aspect of the present invention, it is possible to omit wasted data search time and the like, and to accurately specify the cause of the abnormality by using data with no excess or deficiency.

Further, according to the fourth aspect of the present invention, it is possible to display in an optimum graph format according to the detected content, and it is possible to eliminate excessive data display and insufficient data display required for diagnosis.

Further, according to the fifth aspect of the present invention, it is possible to infer at a glance the state of abnormality detection, and it is possible to accurately grasp the state of vibration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a rotating body vibration diagnosis device according to the present invention.

FIG. 2A is a diagram showing a processing procedure of the vibration diagnostic device of FIG. 1, and FIG. 2B is a graph showing an example of abnormal vibration.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing a processing procedure of the vibration diagnostic device of FIG. 3;

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a diagram showing a processing procedure of the vibration diagnostic device of FIG. 5;

FIG. 7 is a block diagram showing another embodiment of the present invention.

FIG. 8 is a diagram showing a processing procedure of the vibration diagnostic device of FIG. 7;

FIG. 9 is a block diagram showing another embodiment of the present invention.

FIG. 10 is a diagram showing a processing procedure of the vibration diagnostic device of FIG. 9;

FIG. 11 is a block diagram showing a conventional rotating body vibration device.

12 (a), (b), (c), (d), and (e) are diagrams showing display examples of vibration amplitude.

[Explanation of symbols]

 4 Vibration data processing unit 5 Operating state determination unit 6 Abnormality detection unit 7 Data storage unit 14 Vibration change accumulation processing unit 17 Vibration change cycle calculation processing unit 18 Abnormal state determination data storage unit 20 Abnormal graph display switching unit

Claims (5)

[Claims] 1. A vibration data input unit for inputting a vibration amount from a means for detecting a shaft vibration, a vibration for analyzing a vibration amplitude / order ratio, and calculating a vibration amplitude increase rate / vibration vector change rate based on the detected vibration amount. A data processing unit, a process data input unit that inputs a process state quantity related to vibration of the rotating body, and an operating state determination unit that determines an operating state based on the obtained process state quantity, wherein the vibration data processing An abnormality detection unit that compares the vibration data calculated by the operation unit with a predetermined abnormality determination threshold value for each operation state obtained by the operation state determination unit to determine whether there is an abnormality; The storage destination of the vibration data and the process state quantity is determined according to the determination result, and the data storage unit that stores the vibration data and the process state amount in a predetermined file, and the abnormality determination result is compared with a matrix in which items are classified according to abnormality causes. In a rotating body vibration diagnosis device, comprising: an abnormality cause diagnosis unit that specifies a cause of abnormality by using a vibration display unit; and a data display unit that performs processing for graphing the vibration data and displays the graph. A vibration change accumulation data storage unit that stores the obtained vibration amplitude change rate data in a predetermined file over a predetermined period of time in the past, and a vibration change accumulation unit that calculates an absolute value of the vibration amplitude change rate based on the data stored in the file. A rotating body vibration diagnosis device, comprising: a processing unit. 2. A vibration change period data storage unit for storing vibration amplitude data calculated by the vibration data processing unit in a predetermined file over a predetermined period of time in the past, and a frequency analysis based on the data stored in the file. And a vibration change period calculation processing unit for calculating a change period of the vibration amplitude, a periodic change amount of the vibration amplitude calculated by the vibration change period calculation processing unit, and an operation state obtained by the operation state determination unit. An abnormality detection unit that determines the presence or absence of an abnormality by comparing the change amount of the vibration amplitude cycle with a predetermined abnormality determination threshold value for each of the vibration amplitude periods, and uses the obtained abnormality determination result to detect the periodic change in the vibration amplitude. 2. The rotating body vibration diagnosis device according to claim 1, further comprising: an abnormality cause diagnosis unit that identifies an abnormality cause by comparing with a matrix included in the cause item. 3. The abnormality determination data storage unit according to claim 2, further comprising: an abnormality determination data storage unit configured to store the storage cycle and period of the abnormality data in several types according to the detection content from the abnormality determination result in the abnormality detection unit. Rotating body vibration diagnostic device. 4. An abnormality graph display switching unit for switching a period and a period of display data into several types according to the detection content from the abnormality determination result in the abnormality detection unit. The rotating body vibration diagnostic device according to the above. 5. The apparatus according to claim 2, further comprising: an abnormality graph display line color switching unit that switches the display to a predetermined line color according to the detection content based on the abnormality determination result in the abnormality detection unit. Rotating body vibration diagnostic device.