JP3272144B2 - Monitoring and diagnostic equipment for rotating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for monitoring and diagnosing a rotating device which monitors a state of the rotating device constituting a plant and judges an abnormality.

[0002]

2. Description of the Related Art This type of monitoring and diagnosing apparatus monitors, for example, the vibration of rotating equipment (hereinafter, also simply referred to as equipment) in a nuclear power plant, and the vibration value of the monitored object is likely to deviate from an allowable range in a normal operation state. It is used for the purpose of calling attention to the operator in the event of a collision.

FIG. 11 is a block diagram showing the configuration of a conventional monitoring and diagnostic apparatus of this type. In FIG. 1, a vibration detector 1 is attached to a monitoring target, converts a vibration value of the monitoring target into an electric signal, and outputs the electric signal. The output electric signal is sent to a threshold comparing device 3. The threshold value storage device 4 stores a threshold value for judging abnormality, and an electric signal corresponding to the threshold value is also sent to the threshold value comparison device 3. In addition, the threshold value storage device 4 includes:
A threshold value determined by the operator based on the vibration value of the monitoring target detected when the actual operation of the plant is started is stored. Then, during monitoring, the threshold value comparing device 3 compares the two electric signals sent thereto, and when the electric signal from the vibration detector 1 is larger than the electric signal from the threshold value storing device 4, the abnormality is detected. Is sent to the display device 5. Therefore, the display device 5 displays that the vibration value has deviated from the allowable range, and alerts the operator.

[0004]

Generally, when a device constituting a plant is disassembled and inspected by periodic inspection or the like, even if the device is in a normal state, the vibration value differs between before and after the disassembly inspection. There are cases. Also, in a large plant such as a nuclear power plant, it takes several days from the start of operation to reach the rated operation state, but the operating conditions of each device during the start-up of the plant are changing every moment, Along with this, even if each device is in a normal state, its vibration value changes. Further, in some types of equipment, the nature of the subsequent vibration may be slightly different due to disturbance such as an earthquake, and therefore, the vibration value may change even when the equipment itself is in a normal state.

[0005] In contrast to the monitoring of equipment having such characteristics, the conventional monitoring and diagnosing apparatus does not perform monitoring at the beginning of the plant because the vibration value of each equipment at that time is unknown. After reaching the rated operation state, the monitoring target vibration value is measured for a certain period of time to understand the fluctuation range of the monitoring target vibration value in the normal state under the rated operation condition, and then set the threshold value The method of doing was adopted.

Incidentally, the rate of occurrence of abnormalities in the equipment constituting the plant is higher in the process of starting up the plant after disassembling and assembling it for periodic inspections and the like than in the case where the plant is operating stably. It has been. However, in the conventional equipment, even if some abnormality occurs in the equipment during the start-up of the plant, the operation continues without detecting this abnormality, and as a result, the abnormality of each equipment spreads to other equipment, and in the worst case In such a case, there is a possibility that the entire plant may be seriously damaged.

Further, when the vibration characteristics are slightly different afterwards due to a disturbance such as an earthquake, if the threshold value set as described above is used, even if the device is operating normally, caution information can be obtained. In spite of an erroneous display or a change in the vibration value, it takes time until the threshold value is exceeded, and the detection of an abnormal sign may be sent.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a monitoring and diagnosing apparatus for rotating equipment capable of performing monitoring immediately after starting operation of a plant. It is another object of the present invention to provide a monitoring and diagnosing apparatus for a rotating device capable of performing highly reliable monitoring even when the state of the device changes due to disturbance or the like.

[0009]

SUMMARY OF THE INVENTION A monitoring and diagnosing apparatus for rotating equipment according to the present invention monitors rotating equipment constituting a plant, and measures a vibration value of the monitoring target after a test operation performed before start-up of the plant. , An operation parameter detector for detecting an operation parameter to be monitored after the test operation of the plant, a detection value storage means for storing the detected vibration value and the operation parameter, and a stored test. Threshold setting means for setting a provisional threshold for determining an abnormality of a monitoring target at the time of plant startup based on the vibration value and the operation parameter during operation in accordance with the operation parameter; A threshold storing means for storing a threshold value, and a threshold storing means corresponding to the operating parameter detected by the operating parameter detector at the time of plant startup. And a threshold comparator means for determining to monitored abnormality compared with the oscillation value detected by the value and the vibration detector.

Preferably, the threshold value setting means estimates the relationship between the vibration value and the operating parameter in an actual operating environment from the relationship between the monitored vibration value and the operating parameter detected during the test operation of the plant. Then, a provisional threshold value at the time of plant startup is set based on the estimation result and the variation in the vibration value at the time of plant startup in the past stored in the detected value storage means.

At this time, the threshold value setting means uses the dynamic analysis model to calculate the vibration value and the operating parameter in the actual operating environment from the relationship between the vibration value and the operating parameter obtained in the test operation of the plant. Can be estimated.

Further, the threshold value setting means calculates a standard deviation of a vibration value at the time of the past plant start-up for each operation parameter, and multiplies the standard deviation by a constant to calculate the estimated actual operating environment. It is advisable to calculate the provisional threshold value by adding the operating parameters at the same to the same vibration value.

Further, the threshold value setting means, when the operating condition in the test operation does not include the actual operating condition, calculates an approximate expression representing the relationship between the operating parameter obtained in the test operation and the vibration value. By interpolating and / or extrapolating the vibration value, the relationship between the operating parameter and the vibration value over the entire range of the actual operating conditions is estimated.

[0014] The threshold value setting means may be used in a hit test.
Alternatively, the resonance frequency and the damping constant of the vibration can be calculated from the change waveform of the vibration value in the transient state at the moment of starting the device, and the relationship between the estimated operating parameter and the vibration value can be corrected.

Further, input means capable of inputting a command to change the threshold value during the transition from the start-up operation of the plant to normal operation, and detection value storage means when the command to change the threshold value is input. Statistical processing of the relationship between the operating parameter and the vibration value obtained during the normal operation of the plant stored in to calculate a threshold associated with the operating parameter, and stored in the threshold storage means Threshold changing means for changing the provisional threshold to a threshold calculated by statistical processing, wherein the threshold comparing means detects the changed threshold and the detected vibration during normal operation of the plant. It is preferable to determine the abnormality of the monitoring target by comparing the value with the value.

In the statistical processing, the threshold value changing means calculates an average value of the vibration values during the past normal operation associated with the operation parameters, calculates a standard deviation, and assigns a constant to the standard deviation. The multiplied value can be added to the average value to form a threshold.

Another monitoring and diagnosing apparatus for rotating equipment according to the present invention monitors rotating equipment constituting a plant, and performs an adjustment test performed after disassembly and assembly of the monitored object.
A vibration detector that detects a vibration value of a monitoring target after a test operation performed before the start-up of a plant, and an operation parameter detector that detects an operation parameter of a monitoring target after a test operation of the plant. A detection value storage means for storing vibration values and operation parameters, and a provisional threshold value for judging abnormality of a monitoring target at plant startup based on the stored vibration values at the time of the adjustment test correspond to the operation parameters. Threshold setting means for setting the threshold, storage means for storing the set provisional threshold, and a threshold corresponding to the operating parameter detected by the operating parameter detector when the plant is started up Threshold value comparing means for comparing the provisional threshold value of the storage means with the vibration value detected by the vibration detector to determine the abnormality of the monitoring target.

[0018]

According to the present invention, a vibration value and an operation parameter of a monitoring target after a test operation performed before start-up of a plant are detected and stored, and subsequently, based on the stored vibration value and the operation parameter, A temporary threshold for determining an abnormality of a monitoring target at the time of plant startup is set and stored in association with an operation parameter, and a temporary threshold corresponding to the detected operation parameter at the time of plant startup. Since the abnormality of the monitoring target is determined by comparing the value with the detected vibration value, the abnormality of the rotating device can be monitored immediately after the start of the operation of the plant.

In this case, since the test operation of the plant is different from the actual operating environment, for example, the dynamic analysis model is used to determine the vibration in the actual operating environment from the relationship between the vibration value and the operating parameters during the test operation. By estimating the relationship between the value and the operating parameter, and further, by setting a provisional threshold value at the time of plant startup based on the estimation result and the previously stored variation in the vibration value at the time of plant startup,
Even when the state of the device changes due to disturbance or the like, highly reliable monitoring can be performed.

When the operating conditions in the test operation do not include the actual operating conditions, the vibration values are interpolated and calculated using an approximate expression representing the relationship between the operation parameters obtained in the test operation and the vibration values. And / or extrapolating, it is possible to easily set a provisional threshold value over the entire range of actual operating conditions.

When there is a resonance point outside the test operation area,
At the time of the impact test, or from the change waveform of the vibration value in the transient state at the moment of device startup, calculate the resonance frequency and damping constant of the vibration,
By correcting the relationship between the estimated operation parameter and the vibration value, the accuracy of the provisional threshold can be improved.

On the other hand, at the time of transition from the start-up operation of the plant to the normal operation, a command for changing the threshold value is inputted, and the relationship between the operation parameters and the vibration value obtained during the normal operation of the plant is correspondingly input. Statistical processing is performed to calculate a threshold value associated with the operation parameter, and by changing this threshold value to the provisional threshold value, it is possible to accurately determine the abnormality of the monitoring target during normal operation.

Further, the provisional threshold value can be easily calculated by using the vibration value data at the time of the adjustment test performed after disassembling and assembling the monitored object instead of the vibration value data at the time of the test operation.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, components denoted by the same reference numerals as those in FIG. 11 indicate elements having the same or similar functions. In FIG. 1, an operation parameter detector 2 detects an operation parameter such as a rotation speed of a device, an operation condition of the device, and the like. The threshold value comparing device 3 includes an operating parameter detector 2 together with an electric signal output from the vibration detector 1.
The electric signal output from the controller is also sent.

Vibration detector 1 and operating parameter detector 2
The electrical signals respectively output from are also sent to the detected value storage device 6. The detected value storage device 6 stores the vibration value and the operation parameter converted into the electric signal, respectively, and is not limited to the time of the actual operation, but also at the time of the adjustment test performed after the disassembly and the assembly and the test operation performed before the start-up of the plant. The detected value is stored in the same manner.

The detected value storage device 6 has a threshold value setting device 7
And a threshold value changing device 8 are connected. this house,
The threshold value setting device 7 calculates a provisional threshold value based on the vibration value and the operation parameter stored in the detection value storage device 6 in accordance with an operator's instruction input using the input device 9. This is sent to the storage device 4. Also,
The threshold value changing device 8 calculates a threshold value based on the vibration value and the operation parameter stored in the detection value storage device 6 in accordance with an operator's instruction input using the input device 9, and obtains the obtained value. The threshold value stored in the threshold value storage device 4 is changed. A display device 10 for displaying the calculation results is connected to the threshold value setting device 7 and the threshold value changing device 8, respectively.

The schematic operation of this embodiment configured as described above will be described with reference to the flowchart of FIG. 2, and then the detailed operation of the threshold setting device 7 and the threshold changing device 8 will be described. Will be described. Generally, when a rotating device is reassembled after its overhaul, for example, by rotating the shaft of the rotating machine by hand, measuring the whirling, measuring the horizontality of the flange portion of the coupling portion of the shaft, bearing An adjustment test such as measurement of the clearance of the part is performed. In addition, before starting the actual plant, a test operation of measuring the vibration value by operating the monitoring target device on a trial basis in an environment different from the actual operating environment is performed.

By operating the vibration detector 1 and the operation parameter detector 2 even during the adjustment test or the test operation, the vibration value and the operation parameter at that time are also stored in the detection value storage device 6 as the measurement results. Is done. In particular, during the test operation, the vibration waveform at the moment when the device is started is also stored. At the time of the adjustment test, the vibration detector 1 may be detached. In such a case, a separately collected vibration value or the like may be input using an input device. These correspond to the process of step 101 in FIG.

Next, before starting the operation of the plant, that is, the operator uses the input device 9 to request the setting of the provisional threshold. Based on this request, the threshold value setting device 7 calculates a provisional threshold value at the time of plant start-up operation and stores it in the threshold value storage device 4. At this time, the calculated provisional threshold value may be displayed on the display device 10 and stored as a condition for confirmation by the operator. Further, the operator may use the input device 9 to correct the provisional threshold value calculated by the threshold value setting device 7. These correspond to the processing of step 102 in FIG.

Next, when the plant is started, both the vibration value detected by the vibration detector 1 and the operation parameter detected by the operation parameter detector 2 are added to the threshold value comparison device 3 and the detection is performed. Value storage device 6
Is also added. Therefore, the threshold value comparison device 3 compares the provisional threshold value in the threshold value storage device 4 corresponding to the detected operation parameter with the detected vibration value, and stores the detected vibration value. When the threshold value is exceeded, a signal corresponding to the abnormality is sent to the display device 5 to display the fact that the vibration value has deviated from the allowable range to call attention to the operator. On the other hand, the vibration values and the operating parameters detected during the blunt start-up process, that is, during the start-up process, are sequentially stored in the detected value storage device 6 over almost the entire period. That is, the detected value is stored as history data. These correspond to the processing of step 103 in FIG.

Next, when a request to change the threshold value is made by the operator via the input device 9 to the threshold value changing device 8 during the transition from the start-up operation of the plant to the normal operation, the threshold value changing device At 8, the history data at the time of normal operation stored in the detected value storage device 6 is taken in, a new threshold value suitable for the operation cycle is calculated, and the threshold value is stored instead of the temporary threshold value stored so far. It is stored in the device 4. At this time, the calculated threshold value may be displayed on the display device 10 and stored as a condition that the operator confirms the threshold value change. The operator may correct the threshold value calculated by the threshold value changing device 8 using the input device 9. These correspond to the process of step 104 in FIG.

Then, the threshold value comparing device 3 compares the detected vibration value with the threshold value in the threshold value storage device 4 corresponding to the detected operation parameter, and stores the detected vibration value. When the threshold value is exceeded, a signal corresponding to the abnormality is sent to the display device 5 to indicate that the vibration value has deviated from the allowable range to call attention to the operator. These correspond to the processing of step 105 in FIG. Further, when the vibration characteristics of the device change due to a disturbance such as an earthquake and the above-mentioned set values are not appropriate, the operator operates the input device 9.
When a threshold value change request is input via the command line, the threshold value changing device 8 is restarted, and based on the history data for a certain period of time accumulated in the detected value storage device 6 up to that point, the threshold value changing device 8 Figure 2 for calculating the new threshold
The process of step 104 is executed. This corresponds to the process of step 106 in FIG.

In this case, as a configuration of the threshold value storage device 4 for storing the provisional threshold value or the threshold value in correspondence with the operation parameter, as shown in FIG. And a temporary threshold value or a threshold value corresponding to each section may be stored. Also, as shown in FIG. The form of the function formula for calculating the threshold value and the coefficient in the formula may be stored. When storing the form of the function formula and the coefficient in the formula, the threshold value setting device 7 and the threshold value changing device 8 determine the form of the function formula and the coefficient in the formula, respectively, and compare the threshold values. The apparatus 3 is configured to calculate the provisional threshold value or the threshold value using the form and the coefficient of the function expression, and to compare the obtained value with the detected vibration value.

Next, the detailed operation of the threshold value setting device 7 will be described. The threshold value setting device 7 performs a test operation after assembling the device and, based on the relationship between the vibration value and the operation parameter obtained in the past, according to the algorithm shown in steps 111 to 114 in FIG. Set the threshold. (A) The vibration value in the test operation environment is corrected to the vibration value in the actual operation environment. (B) Extrapolating and / or interpolating vibration values of operating parameters not obtained in the test operation. (C) The resonance frequency and the damping constant are calculated from the vibration waveform at the moment of the impact test or at the time of starting, and the vibration value is corrected. (D) A threshold value is set based on the variation of the past vibration and the vibration value obtained by the correction.

First, among these processing contents, the processing contents of (a) will be described. In general, the test operation is performed at normal temperature and normal pressure. For example, in a boiling water type nuclear power plant, a pressure of 70 kg / cm ² and a temperature of 240 ° C. are actually used.
It is operated in the environment. This difference in environment affects, for example, the rigidity of a bearing that supports the rotating machine, and therefore, a difference appears in the vibration value. Therefore, it is necessary to correct the relationship between the vibration value and the operation process (hereinafter, referred to as a vibration characteristic curve) obtained in a test environment at normal temperature and normal pressure to a high temperature and high pressure condition. This is done by using a physical simulation such as a dynamic analysis model.
Estimation is possible by estimating the unbalanced position of the shaft and the size thereof, correcting the bearing rigidity with respect to the result under environmental conditions, and performing simulation analysis again with a dynamic analysis model. Further, if data is accumulated over several cycles, a coefficient for multiplying the vibration value at normal temperature and normal pressure can be statistically calculated to obtain a vibration value at high temperature and high pressure.

FIG. 6 shows these processes. Based on the data obtained in the test operation and the actual environmental data, a simulation is performed using a dynamic analysis model, and the vibration value obtained in the test operation is calculated. It is corrected to the vibration value in the actual operating environment.

Next, the contents of the process (b) will be described. In general, test operation does not always include all actual operation conditions. That is, there is a case where the vibration values for all the operation parameters cannot be obtained. In that case, in the region where the operation parameter is not obtained, the above-mentioned corrected vibration characteristic curve is subjected to interpolation and / or extrapolation, and the entire region of the operation parameter is compared with the operation parameter and the vibration value. Estimate the relationship. Interpolation and / or extrapolation
For example, a method of approximating a vibration value by a polynomial of an operating parameter using a least squares method or a vibration response curve formula shown below in a variable speed rotating device, and interpolating and / or extrapolating the approximation formula is used.

[0038]

(Equation 1) Where F: vibration value ω: operating parameters a, b, c, d, e, f: constants. FIG. 7 shows these processes. The corrected data is approximated by a polynomial of the operating parameter using the least squares method and the vibration response curve of the formula (1), and these formulas are used. Then, values to be interpolated and / or extrapolated are calculated, whereby the relationship between the operating parameters and the vibration values is estimated for the entire region of the operating parameters.

Next, the processing content of (c) will be described. For example, when the support mechanism of the rotating device, the piping, and the like are modified, the resonance frequency of the rotating device and the response magnification at resonance may be different before and after the modification. When the resonance frequency is within the above-described test operation range, these can be grasped from the data obtained in the test operation. However, when the resonance frequency is outside the test operation range, it is impossible to grasp them. .

In this case, for example, the device to be monitored is hit and the vibration is obtained from the vibration waveform obtained at that time.
When the device is hit, an impact waveform as shown in FIG. 8 is observed. By passing this waveform through various band-pass filters or applying wavelet transform, the number of peaks per unit time and the state of attenuation can be known, and the resonance frequency and response magnification of the device can be calculated from this. If the target device is very large, the above vibration waveform may not be obtained in the impact test. At this time, the same information as described above can be obtained by using the vibration waveform at the moment when the device is started. From the resonance frequency obtained in this way, the operating parameter position requiring the correction of the vibration value accompanying the resonance is estimated, and the correction value of the vibration value can be calculated from the damping constant. Therefore, by superimposing a curve showing the relationship between the interpolated and / or extrapolated vibration value and the operation parameter and the correction value of the vibration value in the estimated operation parameter, the vibration characteristic at high temperature and high pressure is predicted. Can be created.

FIG. 8 shows these processes. The resonance frequency and the damping constant are calculated from the impact test data or the vibration data at the moment of starting, and interpolation and / or attenuation are performed based on the information.
Alternatively, the vibration value corresponding to the extrapolated operation parameter is corrected.

Next, the contents of the process (d) will be described. For the characteristic curve of the vibration value for the entire range of the operation parameter obtained by estimating the relationship between the average value of the vibration value of the monitored device and the operation parameter, for example, the vibration value detected during the conventional plant startup A new threshold curve is obtained by adding a value obtained by multiplying the standard deviation by 3 to 6 times to the predicted vibration value on the characteristic curve.

FIG. 9 shows this relationship, in which a standard deviation σ is calculated from variations detected for each operating parameter in the past, and a value N · σ obtained by multiplying this standard deviation by N (= 3 to 6).
Is added to the characteristic curve of the vibration value to provide a provisional threshold value.

Next, the detailed operation of the threshold value changing device 8 will be described. The threshold value changing device 8 starts its operation in response to an operator's request, and the processing will be described with reference to FIG. The threshold value changing device 8 arranges the past data during normal operation stored in the detected value storage device 6 into a relationship between the operation parameter and the vibration value A, and then approximates the data using the least squares method. , An approximate expression D indicating the relationship between the average value of the vibration values and the operating parameters is obtained. On the other hand, the standard deviation a of the vibration value is obtained from the difference between each vibration value and the above-mentioned approximate expression D, and a value 3 to 6 times the standard deviation a is added to calculate the characteristic curve c of the threshold value. It is stored in the threshold value storage device 4. The approximation formula may be a polynomial expression of the operation parameters as described in (b) as the detailed operation of the threshold value setting device 7, or the formula (1) for a variable speed device.

The method of setting a threshold value by the threshold value changing device 8 is described in Japanese Patent Application No. Hei.
Reference is made to 275462.

Thus, according to the present embodiment, a temporary threshold value at the time of plant startup is set before starting the plant based on each data of the operating parameters and the vibration values obtained in the test operation of the rotating equipment. Since monitoring is performed, monitoring can be performed immediately after the start of plant operation.

Further, since the provisional threshold value at the time of plant startup and the threshold value at the time of normal operation can be corrected based on the data accumulated so far, the state of the equipment has changed due to disturbance or the like. Even in such a case, an optimum threshold value can be set.

In the above embodiment, the threshold value setting device 7 sets the provisional threshold value based on the vibration value in the test operation environment. It is also possible to predict a vibration value at the time of plant start-up from the data obtained in (1), and set a provisional threshold value based on the predicted value.

That is, if the magnitude and the direction of the unbalance of each axis constituting the rotating device are known, if they are combined to form an integral axis, the whirling thereof can be measured by hand turning or the like. In addition, it is possible to grasp the state of the displacement of the shafts when the shafts are coupled, and to grasp the magnitude and direction of the imbalance of the shafts coupled with each other.

A simulation based on dynamic analysis is performed using these results to estimate a vibration value at the time of plant startup, and by performing the processing described in the above (c) and (d), it is possible to estimate a vibration value in an actual environment. It is possible to set a provisional threshold.

Further, a provisional threshold value is obtained from the data obtained in the adjustment test of the equipment as described above, and then the provisional threshold value is calculated based on the vibration value in the test operation environment. You may make it correct according to a value.

As described above, the provisional threshold value is set based on the data obtained in the adjustment test, and the provisional threshold value is further determined by the provisional threshold value obtained based on the data in the test operation environment. By making corrections, more detailed monitoring is possible.

The threshold value setting device 7 determines whether or not the vibration value predicted by the threshold value setting device 7 exceeds the operation limit of the device, so that the vibration value exceeds the operation limit of the device. In such a case, the display device 10 may be used to notify information that reassembles again. As a result, processing before starting the plant can be performed.

[0054]

As is clear from the above description, according to the present invention, a provisional method for judging an abnormality of a monitoring target at the time of plant startup based on a vibration value and an operation parameter at the time of a test operation or an adjustment test. Since the threshold is set and the provisional threshold is compared with the detected vibration value to determine the abnormality of the monitoring target, the abnormality of the rotating equipment can be monitored immediately after the plant operation starts. it can.

In this case, for example, the relationship between the vibration value and the operating parameter in the actual operating environment is estimated by using the dynamic analysis model, and the estimation result and the previously stored vibration at the time of starting up the plant are estimated. By setting the provisional threshold value at the time of plant startup based on the variation in the values, highly reliable monitoring can be performed even when the state of the device changes due to disturbance or the like.

When the operating conditions in the test operation do not include the actual operating conditions, the vibration values are interpolated and / or extrapolated using an approximate expression representing the relationship between the operation parameters and the vibration values. By doing so, it is possible to easily set a provisional threshold value over the entire range of operating conditions.

Further, the resonance frequency and the damping constant of the vibration are calculated from the change waveform of the vibration value in the transient state at the time of the impact test or at the moment of starting the apparatus, and the relationship between the estimated operating parameter and the vibration value is corrected. Thereby, the accuracy of the provisional threshold can be improved.

On the other hand, during the transition from the start-up operation of the plant to the normal operation, the relationship between the operating parameters and the vibration value obtained during the normal operation of the plant is changed to a threshold value obtained by statistical processing. Thereby, it is possible to accurately determine the abnormality of the monitoring target during the normal operation.

If the vibration value data at the time of the adjustment test performed after disassembly and assembly of the monitored object is used instead of the vibration value data at the time of the test operation, the provisional threshold value can be easily calculated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the schematic operation of one embodiment of the present invention.

FIG. 3 is a chart for explaining a detailed configuration of a threshold value storage device configuring one embodiment of the present invention.

FIG. 4 is a chart for explaining a detailed configuration of a threshold value storage device constituting one embodiment of the present invention.

FIG. 5 is a flowchart for explaining the overall operation of the threshold value setting device constituting one embodiment of the present invention.

FIG. 6 is an explanatory diagram for explaining a detailed operation of a threshold value setting device constituting one embodiment of the present invention;

FIG. 7 is an explanatory diagram for explaining a detailed operation of a threshold value setting device constituting one embodiment of the present invention;

FIG. 8 is an explanatory diagram for explaining a detailed operation of the threshold value setting device constituting one embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining a detailed operation of a threshold value setting device constituting one embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between a vibration value and an operation parameter in order to explain an operation of the threshold value changing device constituting one embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a conventional rotating device monitoring and diagnosing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration detector 2 Operation parameter detector 3 Threshold comparator 4 Threshold storage 5, 10 Display 6 Detected value storage 7 Threshold setting device 8 Threshold change device 9 Input device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP 5-79903 (JP, A) JP 1-270623 (JP, A) JP 5-45210 (JP, A) JP 1 245122 (JP, A) JP-A-2-293632 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01H 17/00 G01M 19/00

Claims (9)

(57) [Claims] 1. A vibration detector for monitoring a rotating device constituting a plant, detecting a vibration value of a monitoring target after a test operation performed before start-up of the plant, and monitoring after a test operation of the plant. An operation parameter detector for detecting an operation parameter of interest, a detected value storage means for storing the detected vibration value and operation parameter, and a start-up of a plant based on the stored test operation vibration value and operation parameter. Threshold setting means for setting a provisional threshold value for judging an abnormality of the monitoring target of the plant in accordance with the operation parameter; threshold value storage means for storing the set provisional threshold value; At the time of raising, the provisional threshold value of the threshold value storage means corresponding to the operation parameter detected by the operation parameter detector and the vibration detected by the vibration detector Monitoring diagnostic apparatus of the rotating device with a threshold value comparing means for determining to monitored abnormal comparing and. 2. The method according to claim 1, wherein the threshold setting unit estimates a relationship between the vibration value and the operating parameter in an actual operating environment from a relationship between the monitored vibration value and the operating parameter detected during the test operation of the plant. 2. The rotary device according to claim 1, wherein a temporary threshold value at the time of plant startup is set based on the estimation result and a variation in a vibration value at the time of plant startup in the past stored in the detected value storage means. Monitoring and diagnostic equipment. 3. The method according to claim 2, wherein the threshold value setting means determines a relationship between a vibration value obtained in a test operation of the plant and an operation parameter.
The monitoring and diagnosing device for a rotating device according to claim 2, wherein a relationship between a vibration value and an operating parameter in an actual operating environment is estimated using a dynamic analysis model. 4. The threshold value setting means calculates a standard deviation of a vibration value at the time of plant startup in the past for each operation parameter, and multiplies the standard deviation by a constant to calculate the estimated actual value. 4. The monitoring and diagnosing device for a rotating device according to claim 3, wherein the driving parameter in the driving environment is added to the same vibration value to calculate the provisional threshold value. 5. The method according to claim 1, wherein when the operating condition in the test operation does not include the actual operating condition, the threshold value setting means sets an approximate expression representing a relationship between the operating parameter and the vibration value obtained in the test operation. 3. The monitoring and diagnosing device for a rotating device according to claim 2, wherein the relationship between the operating parameter and the vibration value over the entire range of the actual operating conditions is estimated by interpolating and / or extrapolating the vibration value using the method. 6. The threshold setting means calculates a resonance frequency and a damping constant of a vibration from a change waveform of a vibration value in a transient state at the time of an impact test or at the moment of device startup, and calculates an estimated operating parameter and vibration. 6. The monitoring and diagnosing device for a rotating device according to claim 5, wherein the relationship with the value is corrected. 7. An input means capable of inputting a threshold change command at the time of transition from start-up operation to normal operation of the plant, and storing the detected value when the threshold change command is input. Statistical processing of the relationship between the operating parameter and the vibration value obtained during normal operation of the plant stored in the means to calculate a threshold value associated with the operating parameter,
The provisional threshold value stored in the threshold value storage means,
Threshold changing means for changing to a threshold calculated by the statistical processing, wherein the threshold comparing means compares the changed threshold with a detected vibration value during normal operation of the plant. 7 to judge the abnormality of the monitoring target by using
A monitoring and diagnosing device for a rotating device according to any one of the above. 8. The threshold value changing means calculates an average value of vibration values during normal past operation associated with an operation parameter and calculates a standard deviation in the statistical processing, and calculates a standard deviation. The monitoring and diagnosing device for a rotating device according to claim 7, wherein a value obtained by multiplying a constant is added to the average value to obtain a threshold value. 9. A rotating device constituting a plant is monitored, and an adjustment test performed after disassembly and assembly of the monitored object,
A vibration detector that detects a vibration value of a monitoring target after a test operation performed before the start-up of a plant, and an operation parameter detector that detects an operation parameter of a monitoring target after a test operation of the plant. Detection value storage means for storing the vibration value and the operation parameter, and a provisional threshold value for determining an abnormality of a monitoring target at plant startup based on the stored vibration value during the adjustment test as an operation parameter. Threshold setting means for setting correspondingly; threshold storage means for storing the set provisional threshold; and, when starting up the plant, the operation parameter corresponding to the operation parameter detected by the operation parameter detector. A rotation comparing means provided with threshold comparing means for comparing the provisional threshold value of the threshold value storing means with the vibration value detected by the vibration detector to judge whether the monitored object is abnormal; Vessel monitoring diagnostic equipment.