JPH08304166A - Vibration monitor - Google Patents

Abstract

PURPOSE: To obtain a vibration monitor in which the soundness of an instrumentation loop for vibration waveform signal can be confirmed strictly while monitroting the vibratory state of an object. CONSTITUTION: Vibration waveform of a rotating machine, or the like, detected through a vibration sensor 1 is inputted to a computer 3 where the vibration waveform is subjected to various analyses in order to monitor the vibratory state. The vibration monitor comprises a data judging section 7 provided with a function for judging the soundness of instrumentation loop for vibration waveform signal. The data judging section 7 judges whether the analytic results of vibration waveform data for a predetermined time taken out from a data buffer section 11 satisfy such conditions that 'amplitude of waveform is substantially 0', 'average value of waveform is substantially 0', 'fluctuation in the results of analysis calculation is higher than a set level' or 'power supply frequency noise (50, 60Hz) is higher than a set level'. When at least one condition is satisfied, a judgement is made that a trouble might have occurred in the instrumentation loop and the fact is notified on a display 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration monitoring device for monitoring the state of rotating equipment used in a plant, for example, based on the vibration measurement result of the rotating equipment.

[0002]

2. Description of the Related Art Generally, when the state of a rotating machine or the like in a plant is monitored by measuring the vibration of the rotating machine or the like, the vibration is measured by a speed sensor or a bearing sensor or a casing section of the rotating machine. It is performed by attaching an acceleration sensor or by measuring the vibration of the shaft of a rotating device with a non-contact displacement gauge. Then, the amplitude value of the vibration is displayed on the meter to perform the above monitoring. Further, the signal may be input to a computer and various analyzes may be performed to perform more detailed monitoring.

FIG. 5 is a diagram showing the configuration of a conventional vibration monitoring apparatus using such a computer. In the conventional vibration monitoring apparatus shown in the same figure, reference numeral 21 is a vibration sensor attached to a monitored object such as a rotating device. The vibration waveform signal detected by the vibration sensor 21 is amplified by the preamplifier 22 and then sent to the computer 23. In the computer 23, the output of the preamplifier 22 is converted into a digital value by the A / D converter 25 and is stored in the data buffer unit 28 in the storage device 24 in time series by the data collection processing unit 26. The data determination processing unit 27 takes out data for a fixed time that is continuous in time series from the data buffer unit 28, performs analysis calculation for obtaining the amplitude value, average value, spectrum value, etc. of the vibration waveform, and the analysis result. Is compared with the threshold value data fetched from the threshold value storage unit 29, and the comparison result is displayed on the display 31 through the display processing unit 30 as the monitoring result of the vibration state.

However, such a conventional vibration monitoring device has the following problems. (1) In a device that monitors a process amount of a plant using a computer, an electric signal such as voltage or current is input to monitor the process amount. In this case, the soundness of the instrumentation loop of the vibration waveform signal is evaluated by predefining the range of the electrical signal that can be said to be normal in the instrumentation loop, and determining whether or not the input signal deviates from that range, This is performed by determining whether or not the input signal has a value according to the operating state of the plant at that time. However, in a device that monitors by inputting a vibration waveform signal from a vibration sensor, since the signal is input as a vibration waveform such as voltage,
It is difficult to unconditionally determine the soundness of the instrumentation loop within the range of the electric signal. Further, since the characteristics of the vibration sensor may change depending on the result of adjustment of the equipment in which the sensor is installed, it cannot be determined from the operating state of the plant.

(2) In a configuration using an acceleration sensor as a vibration sensor, when performing a test for confirming the soundness of the instrumentation loop, there is a case where the acceleration sensor is placed on a vibration exciter. It is often tested by monitoring the input signal at the moment of shaking around the mounting location. However, what can be confirmed by this vibration test is only whether or not the vibration waveform signal can be input, and the soundness of the instrumentation loop cannot be accurately confirmed only by the vibration test result.

[0006]

As described above, in the conventional vibration monitoring device, it is difficult to strictly check the soundness of the instrumentation loop of the vibration waveform signal from the vibration waveform data obtained during the monitoring. It was It was also difficult to strictly check the soundness of the instrumentation loop from the results of the vibration test.

The present invention has been made to solve the above problems, and a vibration monitoring apparatus capable of rigorously confirming the soundness of an instrumentation loop of a vibration waveform signal while monitoring the vibration state of an object to be monitored. For the purpose of providing.

It is another object of the present invention to provide a vibration monitoring device capable of reliably collecting, displaying and confirming vibration waveform data during a vibration test. It is another object of the present invention to provide a vibration monitoring device capable of more rigorously confirming the soundness of the instrumentation loop of the vibration waveform signal by using the vibration waveform data obtained by the vibration test.

[0009]

In order to achieve the above-mentioned object, a vibration monitoring apparatus of the present invention digitally detects a vibration waveform of an object to be monitored and a vibration waveform signal input from the vibration detecting means. A conversion unit for converting the value into a value, a storage unit for storing the vibration waveform data digitized by the conversion unit, an analysis of the vibration waveform data stored in the storage unit, and a vibration state of the monitored object based on the analysis result. And determining the soundness of the vibration waveform data by catching an event appearing in the vibration waveform data due to the failure of the instrumentation loop of the vibration waveform signal. .

Factors that may cause a failure of the instrumentation loop include deterioration of the vibration sensor, loose mounting, and poor contact between cables and connectors. Therefore, the data determination means analyzes each of the vibration waveform data for a certain time continuous in time series, evaluates the vibration state of the monitoring target based on the analysis result, and also the vibration waveform data for the certain time. About "waveform amplitude value is almost 0""waveform average value is almost 0""change in analysis calculation result is larger than the first setting value""power frequency noise (50 / 60Hz) is the second setting" It is configured to judge whether or not the conditions of “greater than value” are met, and if at least one condition is met, the soundness of the vibration waveform data is suspected.

Further, in order to achieve the above-mentioned object, the vibration monitoring apparatus of the present invention has a vibration detecting means for detecting the vibration type of the object to be monitored and a converting means for digitizing the vibration waveform signal inputted from the vibration detecting means. And a storage means for storing the vibration waveform data digitized by the conversion means, and a data analysis evaluation for analyzing the vibration waveform data stored in the storage means and evaluating the vibration state of the monitored object based on the analysis result. Means, a test data judging means for judging the vibration waveform data at the time of the shaking test from the vibration waveform data stored in the storing means according to a predetermined judgment criterion, and a vibration data for the shaking test judged by the test data judging means. A test data storage unit for storing the vibration waveform data and an output unit for visually outputting the vibration waveform data at the time of the vibration test judged by the test data judgment unit are provided. It becomes Te.

The test data judging means, for example, when an amplitude equal to or more than a certain fixed value is detected a plurality of times within a certain time width, data for a predetermined time before and after the detection time is included in the vibration test. It is configured to be determined as vibration waveform data.

Further, in the vibration monitoring apparatus according to the present invention, in the vibration monitoring apparatus according to claim 3, a test data analysis means for extracting and analyzing vibration waveform data at the time of a vibration test from the test data storage means, and a test data analysis. The apparatus further comprises an analysis result storage means for storing the analysis result of the means, and an output means for visually outputting the analysis result of the test data analysis means together with the analysis result of the past vibration waveform data stored in the analysis result storage means. It becomes.

[0014]

In the vibration monitoring apparatus according to the present invention, the soundness of the vibration waveform data is judged by catching an event appearing in the vibration waveform data due to the failure of the instrumentation loop of the vibration waveform signal, and thereby determining the soundness of the monitored object. It is possible to strictly check the soundness of the instrumentation loop of the vibration waveform signal and the soundness of the input vibration waveform data during the monitoring of the vibration state of.

Further, in the vibration monitoring device of the present invention,
From the stored vibration waveform data, the vibration waveform data during the vibration test is accurately judged and sampled, and this is output visually, so that the soundness of the instrumentation loop of the vibration waveform signal can be visually confirmed. You can check efficiently.

Further, in the vibration monitoring apparatus of the present invention, the vibration waveform data during the vibration test is analyzed and the analysis result is visually output together with the analysis result of the past vibration waveform data. It becomes possible to evaluate the test results more strictly through comparison with.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a vibration monitoring device according to an embodiment of the present invention. In the figure, 1 is a vibration sensor attached to an object to be monitored such as rotating equipment in a plant, and 2 is a preamplifier for amplifying a detection signal of the vibration sensor 1. Further, 3 is a computer, and 4 is a storage device in the computer 3. In the computer 3, an A / D converter 5 for converting the output of the preamplifier 2 into a digital value, a data collection processing unit 6, a data determination processing unit 7, a display processing unit 8, a test data storage processing unit 9, and a test. A data determination processing unit 10 is provided.

As shown in FIG. 2, the data collection processing unit 6 performs a process of storing the vibration waveform data obtained through the A / D converter 5 in the data buffer unit 11 in the storage device 4 in chronological order.

The data determination processing unit 7 extracts from the data buffer unit 11 vibration waveform data for a fixed time that is continuous in time series, and performs an analytical calculation for obtaining the amplitude value, average value, spectrum value, etc. of the vibration waveform. The analysis result is compared with the threshold value extracted from the threshold value storage unit 12 in the storage device 4, and the comparison result is displayed as a monitoring result of the vibration state of the monitoring target through the display processing unit 8 on the display 13 To display.

In order to determine the soundness of the instrumentation loop of the vibration waveform signal, the data determination processing unit 7 evaluates the following four items with respect to the analysis result of the vibration waveform data for the fixed time.

(A) The amplitude value of the waveform is almost 0 (b) The average value of the waveform is almost 0 (c) The change in the analysis calculation result is larger than the set value (d) The power supply frequency noise (50/60 Hz) is set If the data determination processing unit 7 determines that a condition that meets at least one of the above conditions is judged to be a failure in the instrumentation loop of the vibration waveform signal, The indication is displayed on the display 13 through the display processing unit 8.

The test data storage processing unit 9 includes the vibration sensor 1
When a vibration test is performed in a configuration using an acceleration sensor as above, as shown in FIG. 3, the vibration waveform data 31 at the time of the vibration test is judged and taken out from the data buffer unit 11 and stored in the storage device 4. The vibration waveform data at the time of the vibration test is displayed on the display 13 through the display processing unit 8 at the same time as being stored in the test data storage unit 14. Specifically, when the test data storage processing unit 9 detects an amplitude equal to or greater than a certain constant value a plurality of times within a certain time width, the test data storage processing unit 9 outputs data for a predetermined time before and after the detection time during the vibration test. Judge as vibration waveform data. The test data determination processing unit 10 retrieves the vibration waveform data each time it is written in the test data storage unit 14, analyzes and calculates the amplitude value, average value, spectrum value, etc. of the vibration waveform, and tests the result. The data history is stored in the test data history storage unit 15. At the same time, the test data determination processing unit 10 displays the test data history at that time on the display 13 through the display processing unit 8 at the same time as the past test data history already stored in the test data history storage unit 15.

Next, the operation of the vibration monitoring apparatus of this embodiment will be described. FIG. 4 is a flowchart showing the operation procedure of the vibration monitoring device. The vibration waveform detected by the vibration sensor 1 is digitized by the A / D converter 5, then fetched at regular intervals by the data collection processing unit 6 and written in the data buffer unit 11 in time series.

The data determination processing unit 7 extracts from the data buffer unit 11 the vibration waveform data for a fixed time continuous in time series for each predetermined monitoring cycle (steps 301, 3).
02), analysis calculation for obtaining an amplitude value, an average value, a spectrum value, etc. for the vibration waveform is performed (step 30).
3). In addition, the data determination processing unit 7 includes the threshold storage unit 1
The threshold value corresponding to each analysis value is extracted from 2 and each threshold value is compared with each analysis result (step 304). The data determination processing unit 7 determines from the comparison results whether or not the vibration of the monitored object deviates from the normal state (step 305), and if it deviates, there is a possibility of an abnormal state. To that effect, the display 13
(Step 310).

Next, the data judgment processing unit 7 sequentially evaluates the following four items for the analysis result of the vibration waveform data in order to judge the soundness of the instrumentation loop of the vibration waveform signal. First, it is determined whether or not the amplitude value of the vibration waveform is almost 0 (step 306). If YES, it is displayed on the display unit 13 through the display processing unit 8 that the fault may have occurred in the instrumentation loop. (Step 311). NO
If, proceed to the next evaluation. Next, it is judged whether or not the average value of the vibration waveform is almost 0 (step 307), and YE
In the case of S, the abnormality message of step 311 is displayed as in the above. If NO, proceed to the next evaluation. Next, it is determined whether or not the change in the analysis calculation result (difference from the analysis calculation result with respect to the previous vibration waveform data) is larger than the set value (step 308), and if YES, the abnormal message in step 311 as described above. Is displayed. If no, go to the final evaluation. Finally, it is determined whether or not the power supply frequency component (50/60 Hz) of the spectrum value is larger than the set value (step 309). If YES, the abnormal message of step 311 is displayed as described above.

If no abnormality is detected in the evaluation of the above four items, the next vibration waveform data is stored in the data buffer unit 1.
Take out from 1 and repeat the same process. Next, the operation when the vibration test is performed in the configuration in which the acceleration sensor is used as the vibration sensor 1 will be described.

When the operator gives a command to perform the vibration test as a command, the test data storage processing unit 9 and the test data determination processing unit 10 are activated. As a result, the test data storage processing unit 9 starts monitoring the vibration waveform data in the data buffer unit 11, and when an amplitude of a certain value or more is detected a plurality of times within a certain time width, before and after including the detection time point. Data for a predetermined time is determined as vibration waveform data at the time of a vibration test, and the data is taken out from the data buffer unit 11 and stored in the test data storage unit 14. At the same time, the test data storage processing unit 9 displays the vibration waveform data during the vibration test through the display processing unit 8 on the display unit 1.
Display in 3.

On the other hand, the test data judgment processing unit 10 extracts the vibration waveform data each time it is written in the test data storage unit 14, and analyzes and calculates the amplitude value, average value, spectrum value, etc. of the vibration waveform. The result is stored in the test data history storage unit 15 as a test data history. At the same time, the test data determination processing unit 10 displays the test data history at that time on the display 13 through the display processing unit 8 at the same time as the past test data history already stored in the test data history storage unit 15.

Therefore, according to the vibration monitoring apparatus of this embodiment, the soundness of the instrumentation loop of the vibration waveform signal and the soundness of the input vibration waveform data are strictly monitored during the monitoring of the vibration state of the monitored object. It can be confirmed, and the reliability of monitoring can be improved.

Further, according to the present embodiment, since the vibration waveform data at the time of the vibration test can be surely collected and displayed, the soundness of the instrumentation loop of the vibration waveform signal can be visually confirmed efficiently. can do.

Further, according to the present embodiment, since the analysis result of the vibration waveform data at the time of the vibration test can be compared with the analysis result of the past vibration waveform data, the test result can be evaluated more strictly. It will be possible.

[0032]

As described above, according to the vibration monitoring apparatus of the present invention, the phenomenon appearing in the vibration waveform data due to the failure of the instrumentation loop of the vibration waveform signal is detected to check the soundness of the vibration waveform data. By making the determination, the soundness of the instrumentation loop of the vibration waveform signal and the soundness of the input vibration waveform data can be strictly checked during the monitoring of the vibration state of the monitoring target.

Further, from the stored vibration waveform data, the vibration waveform data during the vibration test is accurately judged and sampled,
In addition, since it can be displayed, the soundness of the instrumentation loop of the vibration waveform signal can be visually confirmed efficiently.

Further, since the vibration waveform data at the time of the vibration test is analyzed and the analysis result is visually output together with the analysis result of the past vibration waveform data, the test is conducted more strictly through comparison with the past analysis result. It will be possible to evaluate the results.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a vibration monitoring device that is an embodiment of the present invention.

FIG. 2 is a diagram showing how data is stored in a data buffer unit.

FIG. 3 is a diagram showing data transfer from a data buffer unit to a test data storage unit.

FIG. 4 is a flowchart showing an operation procedure of the vibration monitoring device according to the present embodiment.

FIG. 5 is a block diagram showing a configuration of a conventional vibration monitoring device.

[Explanation of symbols]

 1 ... Vibration sensor 2 ... Preamplifier 3 ... Computer 4 ... Storage device 5 ... A / D converter 6 ... Data collection processing unit 7 ... Data judgment processing unit 8 ... Display processing unit 9 ... Test Data storage processing unit 10 ... Test data determination processing unit 11 ... Data buffer unit 12 ... Threshold storage unit 13 ... Display unit 14 ... Test data storage unit 15 ... Test data history storage unit

Claims (5)

[Claims] 1. A vibration detecting means for detecting a vibration waveform of a monitored object, a converting means for converting a vibration waveform signal input from the vibration detecting means into a digital value, and vibration waveform data digitized by the converting means. And a storage means for storing the vibration waveform data stored in the storage means to analyze the vibration state of the monitored object based on the analysis result, and due to a fault in the instrumentation loop of the vibration waveform signal. Then, the vibration monitoring device is provided with a data judging means for judging the soundness of the vibration waveform data by catching an event appearing in the vibration waveform data. 2. The vibration monitoring device according to claim 1, wherein the data determination unit analyzes each of the vibration waveform data for a fixed time that is continuous in time series, and the monitored object is based on the analysis result. Of the vibration waveform data for the certain time, “the amplitude value of the waveform is almost 0”, “the average value of the waveform is almost 0”, and “the change of the analysis calculation result is smaller than the first set value”. Large ”Judgment is made as to whether or not the power supply frequency noise (50 / 60Hz) is greater than the second set value”, and if at least one condition is met, the soundness of the vibration waveform data is judged. A vibration monitoring device characterized by determining that there is a suspicion. 3. A vibration detecting means for detecting a vibration type of a monitored object, a converting means for converting a vibration waveform signal input from the vibration detecting means into a digital value, and vibration waveform data digitized by the converting means. And a data analysis evaluation unit that analyzes the vibration waveform data stored in the storage unit and evaluates the vibration state of the monitored object based on the analysis result. Test data determining means for determining the vibration waveform data during the vibration test according to a predetermined determination standard from the vibration waveform data, and test data for storing the vibration waveform data during the vibration test determined by the test data determining means. It is provided with a storage means and an output means for visually outputting the vibration waveform data at the time of the vibration test determined by the test data determination means. Vibration monitoring device. 4. The vibration monitoring device according to claim 3, wherein a test data analysis unit for extracting and analyzing vibration waveform data at the time of the vibration test from the test data storage unit, and an analysis result of the test data analysis unit. It further comprises: an analysis result storage means for storing; and an output means for visually outputting the analysis result of the test data analysis means together with the analysis result of the past vibration waveform data stored in the analysis result storage means. Vibration monitoring device. 5. The vibration monitoring device according to claim 3, wherein the vibration detecting means is an acceleration sensor.