JP2900864B2 - Automatic setting method of alarm value and reference value in rotating equipment vibration monitoring and diagnosis system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically setting an alarm value and a diagnostic reference value for each rotating device in a vibration monitoring system for rotating devices such as a generator, a motor, a turbine, a fan, and a pump.

[0002]

2. Description of the Related Art Conventionally, in this type of rotating equipment vibration monitoring and diagnosis system, alarm values and diagnostic reference values are generally set one by one based on design values or empirical values of each rotating equipment. It is.

[0003]

However, since the vibration may change due to a change in the load or, in some cases, a change in the temperature, the alarm value set as described above may not be applied to the rotating device. Although there is no problem, an inconvenience such as an alarm being generated due to a change in load or the like may occur in such a case. In such a case, it is necessary to set again with reference to the alarm generation value. If the number of measurement points to be monitored is hundreds of millions, such as power plant facilities, alarm values and standard values are manually calculated for each of the target measurement points. It is very hard to set. The present invention has been made in view of the above problems of the prior art, and has as its object to set optimal alarm values and diagnostic reference values covering variable elements in a rotating device vibration monitoring and diagnostic system. The purpose of the present invention is to save labor for setting alarm values and diagnostic reference values.

[0004]

In order to achieve the above-mentioned object, a method for automatically setting an alarm value and a reference value in a vibration monitoring and diagnosing system for rotating equipment according to the present invention uses a vibration sensor attached to a bearing of the rotating equipment. Periodically collects vibrations of the equipment in the form of voltage waveforms, performs A / D conversion, computes spectrum data, overalls, etc. with a computer, performs data analysis, data monitoring, and integration, and based on these data, In a rotating equipment vibration monitoring and diagnosis system for performing abnormality monitoring and estimating an abnormality cause, a target measurement point, the number of data to be collected, and a table used for setting are set on a control computer of the system, and based on these setting conditions, Data is collected via the vibration sensor on the above system, and the collected data is statistically processed to determine an alarm value and a diagnostic reference value. At been warning value and diagnosing reference value setting table of conditions it is to automatically registered in the control computer. In the present invention, the alarm value refers to a level value of a vibration that issues an alarm, and the diagnostic reference value refers to a reference value for estimating a cause of abnormality.

[0005]

According to the automatic setting method of the alarm value and the reference value in the vibration monitoring and diagnosing system of the rotating device configured as described above, the alarm value serving as a reference for warning the abnormality of the rotating device and the criterion for estimating the cause of the abnormality are provided. The reference value is automatically set in a state in which the variable element is covered based on the operation state for a predetermined period.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing an example of a rotating device vibration monitoring and diagnosis system. This system includes a vibration sensor 2 mounted on a bearing of a rotating device 1.
The vibration is periodically collected in the form of a voltage waveform, and the spectrum data and overall data are transmitted to the line computer 5 via the A / D converter 8 and the data collection device in the on-site instrument panel 3 and the line controller 4 as a whole. Data analysis, data monitoring and integration, and furthermore, each line computer 5
From the computer to the general monitoring computer (workstation) 6 via the Internet, collectively manages and accumulates data of a plurality of rotating devices, and monitors an abnormality of the rotating device 1 based on the data. In addition, when an abnormality occurs, an alarm is generated and the cause of the abnormality is estimated. In the rotating device vibration monitoring and diagnostic system shown here, a plurality of rotating devices are connected to a line computer for each line, and each line computer is connected to a general monitoring computer via an internet. Of course, it is also possible to connect directly to the supervisory computer without going through a computer. In the figure, 7 is a junction box, 9 is a terminal block,
10 is an optical adapter and 11 is a hard desk. The collection interval of the periodic collection of the data is, for example, an overall (0
A) Data is set to 8 data averages once every 5 seconds and spectrum (SP) data is set once every hour.

The present invention automatically sets a level value at which an alarm is generated and a diagnostic reference value for estimating the cause of an abnormality in the rotating device vibration monitoring and diagnosing system. Collect the required number of overall data and spectrum data of the target location for setting alarm values and reference values, and statistically process the collected data with the control computer of the above system to calculate the optimal alarm setting values and diagnostic reference values. This is characterized in that it is automatically registered at the computer desk.

The items to be automatically set are, for example, an overall alarm, a spectrum alarm, a spectrum alarm, a spectrum reference value, and the like.
The designated operation can be arbitrarily performed on the screen of the general monitoring computer. The alarm value and the spectrum reference value of each of the above alarms are generally set according to the following procedure.

A. A measurement point, that is, a target for setting each alarm value and reference value is selected by a screen operation of the computer. b. The number of data to be collected for each measurement point, that is, the data collection period is set by operating the computer screen. The data collection period can be arbitrarily selected, for example, between 1 day and 20 days. Therefore, data collection in the above system
In the case of overall = sampling once every 5 seconds and spectrum = 8 times once every hour, assuming a data collection period of 20 days, the number of collected data is 345,600 overall and 480 sets of spectra. c. The conditions used for setting according to the items set for each measurement point by operating the computer screen, for example, whether the setting method is a method based on absolute management or a method based on relative management, whether the set value is based on the ISO standard Is set in a table to determine whether the data is JIS or JIS standard. d. At each measurement point based on the above set conditions, overall and spectrum data collection is started via a vibration sensor provided at the measurement point. e. Collection of the set number of data is completed. f. Statistical processing is performed on the collected data sequentially from the measurement points for which collection has been completed. g. Based on the determined data and values, an alarm value and a reference value are set for each measurement point under the conditions of the setting table.

The statistical processing of the collected data is shown in FIGS.
In the case of an overall alarm, a MAX value is first extracted from the collected overall data. At this time, the collected data is sorted in descending order, sorted in descending order, and abnormally large data deviating from the normal mode is x% (in this case, 0.1%).
%) Cut.

Since the overall data is sampled once every 5 seconds as described above, for example, in the collected overall data for 20 days, the number of collected data = 345,600 → the number of cuts = 345, and the remaining 345,255 The MAX value is extracted from the data. The overall alarm is provided with a caution alarm and a danger alarm, and calculates a caution value and a danger value from the MAX value.

The calculation of the overall alarm value is performed according to the procedure of the flowcharts shown in FIGS.
In the case of a spectrum alarm and a spectrum alarm, each set of collected spectrum data is divided into B1 to B6 sections, and each MAX of the B1 to B6 sections is divided.
The spectrum value is extracted and the MAX value of the inner wheel Σ, outer wheel Σ, 8N or more Σ value is calculated.

The MAX spectrum values, the inner wheel ΣMAX value, the outer wheel ΣMAX value, and the 8N or more ΣMAX value of the B1 to B6 sections are transferred to the data table and written into the data table. Then, a spectrum alarm value and a spectrum Σ alarm value are calculated from the MAX value. The spectrum alarm has a caution alarm and a danger alarm, and the spectrum II alarm has only a caution alarm.

The caution alarm value and the danger alarm value of the spectrum alarm are set in a ratio based on the extracted MAX spectrum value, and the caution alarm value of the spectrum Σ alarm is set in proportion to the MAX of each Σ value. You. The spectrum MIN
The set values are caution alarm value 0.32 μm and danger alarm value 40 μm. The MIN value of the spectrum alarm setting is inner ring warning alarm value 0.04 μm, outer ring alarm warning value 0.10 μm, 8N or more.
Caution alarm value: 0.01 x 1/100 μm. The ratio at this time is set as a table for each measurement point by operating the computer screen. FIG. 10 is a flowchart of the above-described spectrum alarm value setting, and FIG. 11 is a flowchart of the spectrum / warning value setting.

The overall alarm value, the spectrum alarm value, and the spectrum / alarm value set as described above are read from the shared memory, written to the desk, and transmitted to the line computer 5. On the other hand, as shown in the flowcharts of FIGS. 4 to 7, the spectrum is divided into six sections, the rms value of each section is obtained, and the score is calculated by the frequency distribution of the rms value of each section, as shown in the flowcharts of FIGS. Give the highest scoring spectrum as a representative.

A specific method for selecting the spectrum reference value will be described below. Find the rms value of the 6 sections of the collected spectrum.

(Equation 1) The number of spans is initially specified as Z = 20. The MAX and MIN values of the rms value are extracted for each section. The span is determined by dividing the difference between the MAX value and the MIN value by the number of spans Z for each section. A frequency distribution rating is created for each section. In addition, the way of giving the score is as follows. The following two methods are programmed. Case 2 Scores are given as 10, 9 and so on in descending order of frequency. The scores in the sections B1 to B6 are totaled for each spectrum, and the spectrum having the maximum value is selected. If one set of spectra has a total score of MAX, that spectrum is selected as a spectrum reference value. When a plurality of spectra are selected, a spectrum reference value is selected by the following method. -In the case of 1: Determined-In the case of 2: Select the latest spectrum (the one collected last).・ In the case of three or more: The score evaluation is repeated only for the spectrum with the first tie. At this time, the operation is performed after replacing the number of spans Z by the following method. Here, N _S is the number of members of the tie first place. When N _S / 2 ≧ Z: For the number of spans, determine the frequency distribution up to that time. In the case of N _S / 2 <Z: After changing the number of spans Z to a small value, the frequency distribution is obtained. (Z is rounded up to an integer.) • If the number of spectra at the first tie does not decrease even after repeated evaluation, the latest collected data shall be selected.

The spectrum reference value thus selected is written to the desk, and the diagnostic reference data is determined based on the spectrum reference value. The rotating equipment vibration monitoring / diagnosing system inputs the diagnostic reference data, writes it on the desk, and compares the collected spectral data with the above-mentioned momentary spectral data to diagnose the machine.

[0018]

As described above, according to the present invention, a target measurement point, the number of data to be collected,
A table used for setting is set, data is collected on the system based on these setting conditions, the collected data is statistically processed to determine an alarm value and a diagnostic reference value, and the determined alarm value and diagnostic reference value are determined. Since the diagnostic reference value is transferred to the control means of the system and automatically registered, labor saving for setting the alarm value and the diagnostic reference value can be achieved. Further, the alarm value and the diagnostic reference value to be set are set after covering the variable elements, so that optimum values can be set.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram illustrating an example of a rotating device vibration monitoring and diagnosis system, which is partially omitted.

FIG. 2 is a program chart showing a procedure of automatic alarm setting.

FIG. 3 is a continuation of FIG. 2 in the alarm automatic setting program chart.

FIG. 4 is a continuation of FIG. 2 in the alarm automatic setting program chart.

FIG. 5 is a continuation of FIG. 4 in a program chart of the automatic alarm setting.

FIG. 6 is a continuation of FIG. 5 in the alarm automatic setting program chart.

FIG. 7 is a continuation of FIG. 6 in the alarm automatic setting program chart.

FIG. 8 is a program chart showing a procedure for calculating an overall alarm value.

FIG. 9 is a program chart of the overall alarm value calculation and is a continuation of FIG. 8;

FIG. 10 is a program chart showing a procedure of calculating a spectrum alarm value.

FIG. 11 is a program chart showing a procedure of calculating a spectrumΣalarm value.

[Explanation of symbols]

1: Rotary device 2: Vibration sensor 5: Computer (line computer) 8: A
/ D converter 6: Computer for overall monitoring (workstation)

Claims (1)

(57) [Claims] 1. A vibration sensor attached to a bearing of a rotating device collects vibrations of the rotating device in a voltage waveform, and performs A / D
Converting and calculating spectrum data and overalls with a computer etc., analyzing and monitoring and accumulating data, and based on these data, monitoring and diagnosing rotating equipment for abnormalities and estimating the cause of abnormalities. In the control computer of the system, a target measurement point, the number of data to be collected, a table used for setting are respectively set, and data is collected via the vibration sensor on the system based on these setting conditions. Statistically processing the collected data to determine an alarm value and a diagnostic reference value, and automatically register the determined alarm value and diagnostic reference value in a control computer of the system under the conditions of a setting table. Automatic setting method of alarm value and reference value in rotating equipment vibration monitoring and diagnosis system.