JP2001153719A - Analysis system for vibration characteristic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily conduct a test of the vibration state of an in-plant structure which required a long time from the installation of a device to the evaluation of a measurement and a test result in a short time. SOLUTION: When the installation state of the in-plant structure is inspected and evaluated by measuring the vibration state and temperature of the in-plant structure, data are sent and received by making good use of a radio communication between a handy terminal to which a measuring instrument capable of taking a measurement without contacting a body to be measured is attached and a computer. The measured value is compared and evaluated on the basis of optimum information on material characteristics, etc., of an analytic model and the structure stored when the in-plant structure is designed to automatically update an optimum value matching the measured value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for periodically measuring the vibration of components in a plant, such as piping, instrumentation racks, and intermediate boards, and judging whether the components are installed or excited. The present invention relates to a vibration characteristic analysis system for monitoring a state of a plant.

[0002]

2. Description of the Related Art As one of conventional methods for monitoring a plant, for example, as shown in FIG.
Vibration measurement system 101 for measuring and analyzing 00 vibration
Has compared the measured value with the set value to determine whether the structure is in a normal state.

[0003] Specifically, the procedure of the vibration analysis will be described by taking as an example a case where the soundness of the tightening condition of the mounting bolts at the installation location of the plant internal structure 100 is confirmed.

FIG. 19 shows a conventional vibration measuring system 101.
FIG.

[0005] As shown in FIG.
1 includes an accelerometer 111, an amplifier 112, a recorder 113, and a display device 114. Plant structure 1
To measure the behavior of 00, first, the accelerometer 111 is installed at a measurement point of the plant internal structure 100, and the amplifier 112, the recorder 113, and the display device 114 are wired by a cable or the like. After the wiring, when the plant internal structure 100 is vibrated, the vibration is measured by the accelerometer 111, output to the recorder 113 as a measured value via the amplifier 112, and then displayed on the display device 114 as a response waveform. . Then, the operator reads the peak value of the natural frequency, the response magnification, and the value of the attenuation coefficient from the response waveform, and calculates the natural frequency. As a result, if the measured natural frequency is different from the natural frequency value measured at the time of manufacturing, tighten all the fixing bolts again using a torque wrench, strike again, read the above value and read the natural frequency. I was seeking again.

The accelerometer 111 permanently installed at the measurement location of the plant internal structure 100 is wired so that data can be exchanged between the accelerometer 111 and the recorder 113 on-line. Immediately measured value is recorder 1
13 and subsequently displayed on the display device 114.

Further, a conventional vibration measuring system 101
In order to perform a calibration test of the accelerometer, an accelerometer 111a serving as an accuracy reference is installed next to the accelerometer 111, and an amplifier 112a and a recorder 113 connected to the accelerometer 111a.
a is wired by a cable or the like. And accelerometer 11
Vibration measurement is performed in parallel at 1 and 111a, and sensor signals of the accelerometers 111 and 111a are recorded in the state where the internal structure 101 is vibrating.
And read, compare, and evaluate its accuracy. Therefore, when both errors are out of the allowable range, the accelerometer 1
Eleven sensors are adjusted and the sensor signals are compared again to maintain the accuracy of the meter at a reference value.

[0008] The vibration source 101 indicates a source of vibration to the internal structure 100 of the plant.

[0009]

However, the prior art has the following problems.

First, in the work of confirming the soundness of the tightening of the mounting bolts at the installation location of the building in the plant, an accelerometer is installed at a measurement point of the structure in the plant to perform this work. Must. Specifically, it takes time to install the accelerometer, and after installing the accelerometer, it is necessary to install an amplifier and a recorder, and to wire them, which requires more time. Further, since the installation of the accelerometer cannot be performed under conditions of high temperature and high humidity, the installation work must be performed under limited conditions. As for the piping of the internal structure of the plant, the piping is covered with a heat insulating material. Therefore, when installing the accelerometer, the heat insulating material must be peeled off, which makes the installation work troublesome.

Next, in the method of checking the soundness after installation, the peak value of the natural frequency is read by the operator from the response waveform displayed on the display device, and compared with the value of the sound installation state. For this reason, there has been a problem that the confirmation work largely depends on the reading by the operator, and there is a high possibility that a certification error occurs. And when the comparison result of the peak value of the natural frequency was not judged to be sound, since the worker re-tightened the mounting bolts individually and re-measured,
It took a very long time to perform a series of confirmation work, including measurement, comparison, and adjustment.

Further, in the operation of monitoring the vibration characteristics of the internal structure of the plant, the range that can be monitored is limited to the place where the accelerometer is installed.

Finally, in the accelerometer calibration test, an accelerometer as an accuracy reference must be newly installed next to the accelerometer. It takes a lot of time to install a device associated therewith, and the accuracy of the sensor signals output to the two recorders is evaluated by reading by an operator, so that the reliability of the evaluation is low. Furthermore, depending on the location of the structure in the plant, there is a case where it is not possible to secure an empty space for installing a calibration test accelerometer (which serves as an accuracy standard).

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an accelerometer for measuring a natural frequency of a plant internal structure when performing a vibration analysis of the internal plant structure. Without having to install the
It is an object of the present invention to provide a vibration characteristic analysis system which enables measurement by wireless communication, transmits the measured value to a computer via a portable computer via wireless communication, and analyzes vibration.

Also, according to the present invention, the operator does not read the response waveform of the measured value displayed on the display unit of the recorder and perform the calculation for analysis, but the computer automatically generates the vibration. It is an object of the present invention to provide a vibration characteristic analysis system that can perform analysis and calibrate the accuracy of a vibrometer that measures a natural frequency of a structure in a plant.

[0016]

In order to achieve the above object, a vibration characteristic analysis system according to the first aspect of the present invention comprises:
A handy terminal capable of inputting a measurement signal through an instrument capable of measuring contactlessly to a structure constituting the plant and wirelessly communicating the measurement signal with another device,
The measurement signal is received by wireless communication from the handy terminal, and the characteristics of the target structure are determined based on the seismic evaluation information for each structure and the analysis model information of the structure created at the time of designing the plant with respect to the measurement signal. And an arithmetic unit for evaluation.

According to the first aspect of the invention, an instrument such as a laser vibrometer used for measurement is not in contact with a structure in a plant, and a handy terminal for inputting a signal measured by the instrument is freely provided. Since it can be moved, the work of installing the instrument is not required, and the measurement signal can be collected without being affected by the conditions that allow the conventional instrument to be installed, such as the weather and the shape of the plant internal structure. Can be provided.

According to a second aspect of the present invention, there is provided the vibration characteristic analyzing system according to the first aspect, wherein the transmitting / receiving section for performing wireless communication with the handy terminal and the measurement signal received via the transmitting / receiving section. Among them, a vibration waveform calculation unit that performs a calculation process on a signal indicating a vibration state, a first database storing optimal design information at the time of design with respect to material characteristics of a structure, and a structure for evaluating the strength of the structure A second database storing the optimal design information of the three-dimensional analysis model created in the step (a), a calculation result of the vibration waveform calculation unit, and a first extraction unit for extracting two or more approximate values before and after the calculation result. An analysis model vibration update unit that updates the second database with the calculation result and the approximate value; an analysis execution unit that analyzes the natural frequency based on the value updated by the analysis model vibration update unit; Based on the analysis value obtained in the execution unit, it is characterized by comprising a comparator for comparing the spring constant that matches the vibrational state of the structure, and a spring constant as a reference.

According to the invention of claim 2, by automatically updating the information in the database storing the optimum information on the structure in the plant with the optimum information obtained from the actually measured values, the actual condition of the structure in the plant is improved. It is possible to provide a vibration-passing characteristic analysis system that can perform a proper natural vibration analysis and obtain an appropriate spring constant.

According to a third aspect of the present invention, there is provided a vibration characteristic analyzing system according to the second aspect,
Calculating a natural frequency of the analysis model based on the information indicating the installation strength of the structure stored in the first database;
It is characterized in that a measurement signal received from a handy terminal at the time of a periodic inspection is compared with a natural frequency and subjected to arithmetic processing.

According to the third aspect of the present invention, since the information indicating the installation strength of the internal structure of the plant is stored in the first database in the latest state, the information specific to the internal structure of the plant to be subjected to the periodic inspection is stored. When testing the frequency, the stored information may be used as the information indicating the reference installation strength, so that it is possible to provide a vibration characteristic analysis system capable of efficiently calculating the natural frequency. .

According to a fourth aspect of the present invention, there is provided the vibration characteristic analysis system according to the first aspect, wherein the transmitting and receiving unit for performing wireless communication with the handy terminal and the material characteristics of the structure are designed at the time of design. A first database storing the optimal design information of the three-dimensional analysis model created for evaluating the strength of the structure; a second database storing the optimal design information of the three-dimensional analysis model; A second extraction unit configured to receive a temperature of the structure and extract material characteristics of the structure from the first database based on the temperature; and a second extraction unit configured to extract a material characteristic of the structure based on the material characteristic extracted by the second extraction unit. 2, an analysis model temperature update unit that updates the database, an analysis execution unit that analyzes the natural frequency based on the value updated by the analysis model temperature update unit, and an analysis value obtained by the analysis execution unit Based on, it is characterized by comprising a comparator for comparing the spring constant that matches the vibrational state of the structure, and a spring constant as a reference.

According to the fourth aspect of the present invention, an instrument such as an infrared thermometer used for measurement is not in contact with a structure in a plant, and a handy terminal for inputting a signal measured by the instrument is freely provided. Collecting measurement signals irrespective of the conditions that make it possible to install the instrument because it can be moved, eliminating the need to install the instrument in the past, for example, regardless of the weather or the shape of plant structures Can be. Further, since the test result is automatically corrected based on the temperature change, it is possible to provide a vibration characteristic analysis system capable of reducing the time required for the operation.

According to a fifth aspect of the present invention, there is provided the vibration characteristic analyzing system according to the first aspect, wherein an error between a transmitting / receiving unit for performing wireless communication with the handy terminal and a design of a structure is determined. Third to store as information
Database, via the transmitting and receiving unit, receiving a measurement signal of a vibration source of a continuously or intermittently vibrating structure measured by an instrument and a peripheral structure surrounding the vibration source, respectively, A comparison data storage unit for additionally storing the measurement signal in the third database; and an alarm when the measurement signal of the surrounding structure exceeds an alarm setting value set in advance, and a continuous alarm before and after the alarm is generated. A difference calculation unit that calculates a difference between measurement signals of the vibration source and the surrounding structure in a time width to be performed, and a diagnosis unit that diagnoses states of the surrounding structure and the vibration source based on a result of the difference calculation unit. It is characterized by.

According to the fifth aspect of the present invention, the vibration characteristics of the installation of the plant internal structure can be determined by sampling the vibration waveforms of the internal structure and the vibration source thereof and comparing the difference. An analysis system can be provided.

According to a sixth aspect of the present invention, there is provided a vibration characteristic analysis system according to the second aspect,
Via the transmitting and receiving unit, the measurement signals of the measured installation location of the instrument and the peripheral structures surrounding the installation location are respectively received, the difference between these measurement signals is calculated, and the absolute value of the obtained difference is calculated. When a predetermined tolerance is exceeded, an instruction is given to execute a calibration test of the instrument.

According to the sixth aspect of the present invention, before the calibration test of the instrument is performed, the vibration waveforms of the transmitter and the structure in the plant around the transmitter are sampled in the normal measurement, and the calibration test is performed in accordance with the difference. In order to judge the necessity, it is possible to provide a vibration characteristic analysis system that does not execute unnecessary calibration tests.

According to a seventh aspect of the present invention, there is provided a vibration characteristic analyzing system according to the first aspect, wherein an input unit for inputting information and a communication result with an arithmetic unit are input based on the input information of the input unit. And a display unit for displaying.

The vibration characteristic analyzing system according to the present invention as set forth in claim 8 is the handy terminal according to claim 7, further comprising a receiver for receiving a signal transmitted from a transmitter provided for each process of the structure. It is characterized by having.

According to a ninth aspect of the present invention, there is provided a vibration characteristic analyzing system according to the first and seventh aspects, wherein the vibration waveform calculating section receives input information of an input section via a transmitting / receiving section and is installed in a plant. The method is characterized in that a fixed pitch of the piping is calculated.

According to the seventh to ninth aspects of the present invention, by providing the input unit for inputting data to the handy terminal and the display unit for displaying the data, it is possible to exchange data with the arithmetic unit in a dialogue manner by wireless communication. When a worker carrying a handy terminal works at a site, he can know the measurement points and the measurement order through the display unit by the data transmitted from the arithmetic unit while performing the work.

Further, since the receiver installed in the handy terminal receives information that can identify which transmitter of the internal structure of the plant has received the signal, the handy terminal interacts with the arithmetic unit to obtain vibration characteristics. Can be evaluated.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. Parts common to the prior art are denoted by the same reference numerals, and redundant description will be omitted.

(1) First Embodiment FIG. 1 is a block diagram showing a configuration of a vibration characteristic analysis system 1 of the present embodiment, and FIG. 2 is a block diagram showing a configuration of an arithmetic unit 7 incorporated in a computer.

As shown in FIG. 1, the present system inputs a measured signal to an instrument 3 capable of measuring the vibration characteristics of a plant internal structure 100 such as a pipe suspended from a building ceiling in a non-contact state. It comprises a handy terminal 5 that can move freely and an arithmetic unit 7 that receives signals input to the handy terminal 5 by wireless communication.

As shown in FIG. 2, the arithmetic unit 7 includes a transmission / reception unit 701, a vibration waveform calculation unit 702, and a calculation result extraction unit 7
03, material property database 704 (hereinafter referred to as “material property D”).
B), an analysis model vibration updating unit 705, an analysis model database 706 (hereinafter, referred to as “analysis model DB”), an analysis execution unit 707, and a comparison unit 708.

The material property DB 704 and the analysis model DB 706 store the optimum design information on the material and the analysis model set when designing the in-plant component 100, and the material property DB 704 stores the structural member. Cross section property information of the candidate, material property information of the structural member candidate,
The installation angle information of the structural member candidate, the installation pitch information of the coupling member candidate, and the plate thickness information of the plate-shaped member are stored, and the evaluation criterion for determining the seismic resistance of the plant internal structure 100 based on the information is stored. Create seismic evaluation information. Specifically, the material property information of the structural member includes Young's modulus, Poisson's ratio, material density, and the like, and the cross-sectional property information includes a cross-sectional shape, a cross-sectional area, a second moment of area,
The torsional constant, the shear constant, etc. correspond. On the other hand, in the analysis model DB 706, characteristic information, attribute information, instrument information, coupling member information such as bolts used for instrument installation and main body installation necessary for constructing the analysis model, and furthermore, For plate thickness information etc. of plate-like members,
Analysis model information created at the time of design is stored.

In this embodiment, a plant internal structure 100 composed of piping, a middle control panel, an instrumentation rack, etc.
This is performed to confirm their installation strength. First, a vibration waveform generated by giving a transient impact such as, for example, impact to the target plant structure 100 is measured in a non-contact manner with the structure. The information is measured using a possible meter 3, and the measured information is collected at the handy terminal 5 and transmitted from the handy terminal 5 to the arithmetic unit 7 by wireless communication. The arithmetic unit 7 transmits and receives information to and from the handy terminal 5 by the transmission / reception unit 701.

FIG. 3 is a flowchart showing a procedure in which the arithmetic unit 7 in this embodiment analyzes the natural frequency of the structure in the plant.

As shown in the figure, first, parameters serving as references for determining the installation strength are set (step 31). Then, the transmission / reception unit 701 receives the vibration waveform information actually measured by the instrument 3 via the handy terminal 5 and outputs the information to the vibration waveform calculation unit 702. The vibration waveform calculation unit 702 obtains the natural frequency by the mathematical expression shown in Expression 1, and since the proportional relationships shown by Expressions 2, 3, and 4 are established from the relationship of Expression 1, the internal structure of the plant is obtained by the expression shown by Expression 5. Spring constant (parameter) simulating the installation strength of the object
Is estimated (step 32).

[0041]

(Equation 1)

(Equation 2)

(Equation 3)

(Equation 4)

(Equation 5) (Where, f is the natural frequency, m is the weight applied to the spring, k is a spring constant, A is the pipe cross-sectional area, P is the pipe material density, L ₁ and L ₂ is the length between the pipe fixed, f ₁ is measured Natural frequency, k
Numeral ₁ represents an estimated spring constant, and is described by taking a pipe as an example of a plant internal structure. Next, the natural frequency and the spring constant (parameter) obtained in step 32 are calculated by the calculation result extraction unit 703 in the material property DB.
Access 704 to sample at least two spring constants (parameters) around the spring constants (parameters) (step 33). Further, the analysis model DB 705 is accessed based on a plurality of spring constants (parameters) extracted by the analysis model vibration updating unit 705,
Update is performed with the sampled spring constant (parameter) (step 34). The analysis execution unit 707 creates each analysis model based on the updated spring constant (parameter), and analyzes the natural frequency (step 35). The relationship between the spring constant (parameter) and the natural frequency is represented by a polynomial (step 36), and a spring constant (parameter) suitable for the installation strength of the plant internal structure measured from the polynomial is calculated (step 37). ). Then, the comparison unit 70
In step 8, the installation strength determination reference parameter set in step 31 is compared with the spring constant (parameter) suitable for the installation strength obtained in step 37. If the parameter is within the range of the target error (p), the natural frequency is analyzed. Is completed, and if it is out of the range, the process returns to step 32 and the adjustment is repeated (step 38).

Finally, a spring constant (parameter) suitable for the installation strength obtained within the range of the target error (p) is as follows:
Access the material property DB 704 and update the value.

The processing after step 34 can be automated by the arithmetic unit 7.

FIG. 4 is a graph showing a method of obtaining a spring constant suitable for an actually measured natural vibration value from a spring constant (parameter) sampled to obtain a fixing spring constant. Sampling point 1 (minimum) and sampling point 2 (maximum)
Is extracted.

Although the installation state of the piping has been described as an example here, the object of analysis is not limited to this, and all the installation states for coupling the plant internal structure can be diagnosed.

(2) Second Embodiment As shown in FIG. 5, an arithmetic unit 7a according to this embodiment
Are a transmission / reception unit 701, a vibration waveform calculation unit 702, a material property DB 704, an analysis model DB 706, a comparison calculation unit 71
1, a difference storage unit 712, an accuracy error DB 713, and a determination unit 714.

The arithmetic unit 7a is connected to the plant internal structure 10
The procedure for diagnosing the quality of the installed state from the natural frequency at the time of the periodic inspection of 0 will be described.

First, when the transmission / reception unit 701 receives the vibration waveform from the handy terminal 3, the vibration waveform calculation unit 7
02, the vibration waveform calculation unit 702 calculates the natural frequency of the plant internal structure 100 to be inspected, and outputs the result to the comparison calculation unit 711. Comparison operation unit 71
1 accesses the material property DB and extracts a spring constant suitable for the installation strength stored in the first embodiment. Further, based on this spring constant, the analysis model DB 706
To create an analysis model of the device under test, and determine the natural frequency. Therefore, the difference between the natural frequency obtained by actual measurement and the natural frequency obtained by stored information matching the installation strength is obtained. This calculation result is stored in the accuracy error DB 713 by the difference storage unit 712 and is passed to the determination unit 714. The determination unit 714 determines, from the calculation result, the degree of deterioration of the plant internal structure 100 to be inspected due to aging and the change in installation strength due to rearrangement, modification, or the like.

Accordingly, the work for adjusting the installation strength to the optimum one for the internal structure of the plant during the periodic inspection is automated, so that the burden on the operator is reduced.

(3) Third Embodiment The vibration characteristic analysis system 1 in the present embodiment deals with the vibration waveform of the plant internal structure 100 in the first embodiment, but the temperature (change) is set up. This is to determine the quality of the state.

As shown in FIG. 6, the calculation unit 7b includes a transmission / reception unit 701, a material property DB 704, and an analysis model DB 7
06, analysis execution unit 707, comparison unit 708, temperature extraction unit 7
21 and an analysis model temperature update unit 722.

Therefore, the present embodiment is performed to confirm the installation strength of the plant internal structure 100 due to a temperature change in the same manner as the procedure described in the first embodiment. Plant structure 10
The temperature of 0 is measured using an instrument 3 such as an infrared thermometer capable of measuring the structure without contact with the structure, and the measured information is collected at the handy terminal 5 and calculated from the handy terminal 5 by wireless communication. Transmit to the device 7b.
The arithmetic unit 7b transmits and receives information to and from the handy terminal 5 by the transmission / reception unit 701.

The arithmetic unit 7b firstly operates the plant internal structure 1
00 is received by the transmission / reception unit 701 and output to the temperature extraction unit 712, and the material characteristics DB 70 for the material characteristics of the structure corresponding to the temperature signal.
Access 4 Therefore, a material characteristic corresponding to the temperature signal, for example, a value such as a longitudinal elastic modulus or a lateral elastic coefficient is extracted from a graph of the material characteristic DB 704 indicating a relationship between the material curve and the temperature. The extracted value is stored in the analysis model temperature change unit 722.
Is output to Then, it accesses the analysis model DB 706 and updates the material property information for the analysis model with the extracted values. After the optimization of the analysis model by the temperature is performed, the analysis execution unit 707 creates each analysis model based on the updated material property values, and creates a unique model in accordance with the analysis flowchart of the first embodiment shown in FIG. Analyze the frequency.

The relationship between the spring constant (parameter) and the natural frequency is represented by a polynomial (not shown), and a spring constant (parameter) suitable for the installation strength of the plant internal structure measured from the polynomial is calculated. I do. And the comparison unit 7
At 08, the installation strength determination reference parameter set at step 31 is compared with the spring constant (parameter) suitable for the installation strength obtained at step 37, and if it is within the target error, the analysis of the natural frequency is terminated. If it is out of the range, the process returns to step 32 and the adjustment is repeated.

Finally, the spring constant (parameter) suitable for the installation strength obtained within the target error range accesses the material property DB 704 and updates the value.

(4) Fourth Embodiment As shown in FIG. 7, the arithmetic unit 7c according to the present embodiment
Is composed of a transmission / reception unit 701, a vibration waveform storage unit 731, an accuracy error DB 713, a difference calculation unit 732, and a determination unit 714.

The arithmetic unit 7c is connected to the plant internal structure 10
A procedure for diagnosing the quality of the installed state from 0 and the natural frequency of the vibration source 101 will be described with reference to the flowchart shown in FIG.

First, an alarm value indicating a state to be warned with respect to the received vibration waveform is set (step 81). The transmission / reception unit 701 receives the vibration waveform of the plant internal structure 100 and the vibration source 101 of the structure from the handy terminal 3 and outputs the vibration waveform to the vibration waveform storage unit 731. Then, the vibration waveform storage unit 731 accesses the accuracy error DB. Are newly stored (steps 82 and 83). Further, in order to determine whether the vibration waveform value to be stored exceeds the alarm value set in step 81, the vibration waveform value of the plant internal structure 100 is compared with the alarm value (step 84). As a result, if the alarm value is exceeded, an alarm is issued for the internal structure of the plant, and the vibration of the internal structure of the plant and the vibration source stored in the material property DB 704 for an arbitrary time before and after the alarm is issued. The difference between the waveforms is calculated (step 85). Then, the contents of the abnormality are determined from the entire calculation results in the time period before and after the alarm is issued (step 86). In other words, the calculation result (difference)
Is increasing, the installation state of the internal structure of the plant is defective (step 87), while if it is constant, it is determined that the vibration source is abnormal (step 8).
8).

FIG. 9 shows a procedure for converting a vibration waveform of interest in the present embodiment.

According to the figure, all the vibration waveforms (a) received by the arithmetic unit 7c are represented by waveforms (b) having absolute values, and the form (c) obtained by connecting the peak values of the respective waveforms is defined as the vibration waveform. I do.

FIG. 10 shows that when the plant internal structure 100 exceeds an alarm value set as a method of obtaining a vibration waveform, the plant internal structure 100 and the vibration source 10
This indicates that the difference between the vibration waveform and the vibration waveform No. 1 has been obtained. FIG. 7A shows a case where the difference value is gradually increasing, that is, a case where the installation state of the in-plant structure 100 is defective. On the other hand, FIG. 7B shows a case where the difference value is constant, that is, FIG. , The case where the vibration source 101 is abnormal.

As a result, it is possible to promptly deal with the abnormality of the internal structure of the plant or its vibration source and the analysis of the abnormality.

(5) Fifth Embodiment In this embodiment, the necessity of a calibration test is determined for the vibrometer 103 permanently installed in the internal structure 100 of the plant.

As shown in FIG. 11, the arithmetic unit 7d used in this embodiment includes a transmitting / receiving unit 701, a difference calculating unit 733.
And a determination unit 714.

The measured value of the vibrometer 103 is sampled by the handy terminal 3 together with the measured value of the instrument 3 and transmitted to the transmitting / receiving section 701 of the arithmetic unit 7d by wireless communication. Then, the signal is output from the transmission / reception unit 701 to the difference calculation unit 733, where the difference between the two vibration waveforms is obtained. Further, when the absolute value of the difference exceeds a preset allowable value, it is determined that the vibration meter 103 needs to perform a calibration test.
On the other hand, if the absolute value of the difference between the two vibration waveforms is within the range of the allowable value, it is determined that the vibration meter 103 does not need the calibration test. The method of obtaining the difference between the vibration waveforms has been described in the second embodiment, and will not be described here.

Thus, the calibration test can be executed only when necessary.

(6) Sixth Embodiment As shown in FIG. 12, a handy terminal 5a used in the present embodiment is different from the handy terminal used in the first to fifth embodiments in the configuration of the display unit 501 and data input. A part 502 is added. The arithmetic unit 7e includes a transmission / reception unit 701, an extraction unit 741, a material property DB 704, and an analysis model DB 706.

That is, when an input is made from the handy terminal using the data input unit 501 such as a keyboard, the content is transmitted to the arithmetic unit 7e by wireless communication. After the information is received by the transmission / reception unit 701 of the arithmetic unit 7e, the information corresponding to the information received by the extraction unit 741 is set to the material property D.
It is extracted from B704 and the analysis model DB 706 and returned to the handy terminal 5a. When received by the handy terminal 5a, the response content is displayed on the display unit 501. To give a specific example, a worker inputs a value (type) of a system (building) in which a plant internal structure to be measured is installed from a data input unit 501. Then, the input system is transmitted to the arithmetic unit 7 by wireless communication and received by the transmission / reception unit 701. Then, it accesses the analysis model DB 706 or the like based on the received content, and extracts an analysis model corresponding to the received content. Further, the analysis model DB 706 has attribute information in which the locations and the order in which the vibration starts when the natural frequency analysis is performed are numbered for each location, and this attribute information is also extracted. The extracted information is transmitted to the handy terminal 5a again by wireless communication via the transmission / reception unit 701, and is transmitted to the display unit 50a.
1 is displayed. By looking at the contents displayed on the display unit 501, the operator can recognize the points to be measured and the measurement order of the structure in the plant, regardless of the location.

(7) Seventh Embodiment As shown in FIG. 13, a handy terminal 5b used in the present embodiment has a receiver 511 added to the configuration of the handy terminal used in the sixth embodiment. .

As shown in FIG. 1, the receiver 511 is provided so that a signal transmitted from the transmitting device 102 directly mounted on the vibration source 101 can be received by the handy terminal 5b.

The arithmetic unit 7 is the same as in the sixth embodiment.

Next, the data processing procedure in the handy terminal 5b and the arithmetic unit 7e that have received the signal from the transmitting device 102 will be described with reference to the flowchart shown in FIG.

First, the transmitting device 102 installed for each system of the process in the plant transmits information indicating the positional relationship between the transmitting device 102 and the receiver 511 of the handy terminal 5b (step 141) and receives it. When the data is received by the device 511, it is transmitted to the arithmetic device 7e by wireless communication (step 142). The arithmetic unit 7e includes a transmitting / receiving unit 7
Based on the information indicating the positional relationship received at step 01, the extraction unit 741 accesses the analysis model DB (step 143), and extracts the corresponding analysis model (step 1).
44). The extracted analysis model is transmitted to the handy terminal 5 via the transmission / reception unit 701 (step 14).
5), displayed on the display unit 501 (step 14)
6). Then, the worker or the like looks at the displayed contents and further narrows down the desired information.
Input from step 2 (step 147). The information input here is transmitted to the arithmetic unit 7e again (step 14).
8). The arithmetic unit 7e accesses the analysis model DB in the extraction unit 741 based on the narrowing information received by the transmission / reception unit 701 (step 149), and extracts a corresponding analysis model (step 150).

Taking concretely the piping of the internal structure of the plant, for example, when the receiver 511 receives the position signal indicating the system of the process of the plant from the transmitting device 102, it transmits it to the arithmetic unit 7e, and the extracting unit 741 The analysis model DB is searched based on the position signal, and a plant piping configuration diagram is extracted. The extracted information of the plant piping configuration diagram is transmitted to the handy terminal 5b, and is displayed on the display unit 501 in three dimensions. Further, information (pipe standard, material, dimensions, etc.) corresponding to the pipe to be measured is specified from the displayed pipe configuration by an operator or the like, and the specified information is transmitted to the arithmetic unit 7e. And the extraction unit 7
At 41, the analysis model DB is searched again based on the designated information, and a corresponding analysis model is extracted.

As described above, according to the present embodiment, an analysis model is extracted according to the position information of each system of the process, and an analysis model desired by the operator is further obtained through a dialog between the handy terminal 5b and the arithmetic unit 7e. Since the extraction is performed, the vibration analysis operation can be easily and quickly performed.

(8) Eighth Embodiment As shown in FIG. 15, the handy terminal 5a used in this embodiment is the same as that of the sixth embodiment, and the arithmetic unit 7f includes a transmitting / receiving unit 701 and a pipe. It comprises a pitch calculation unit 751.

First, a piping route, a piping standard, and a target natural frequency, which are installed in the plant, are input from the data input unit 502 of the handy terminal 5a, and the input information is transmitted to the arithmetic unit 7f by wireless communication. Arithmetic unit 7
In f, the signal is received by the transmission / reception unit 701,
51.

FIG. 16 is a flowchart showing a procedure for calculating a reference value of an optimum mounting pitch of a pipe of a standard to be installed by the pipe pitch calculating section 751.

According to the figure, first, both ends of the beam installed to support the plant internal structure (piping), here, FIG.
As shown in FIG. 5, the natural frequency f of the fixed beams 104a and 104b can be obtained by the following equation (step 16).
1).

[0080]

(Equation 6) (Where f is the natural frequency (Hz), l is the length of the fixed pipe pitch, λ is the frequency coefficient, E is the longitudinal elastic coefficient, I is the second moment of area, G is the gravitational acceleration, A is the sectional area, P represents the material density, respectively. And, as can be seen from the relationship of Expression 6, the following proportional relationship of Expression 7 holds. Here, 1 / l ₂ is a unique value of the fixed pipe pitch.

(Equation 7)

Next, a natural frequency which is a strength judgment value for judging the strength of the installed state of the pipe is set (step 1).
62). Subsequently, at least three points of the fixed pipe pitch are sampled. For example, as shown in FIG. 16, samples the pipe fixed pitch to measure across the front and back of the set intensity determination natural oscillation numerical f _m (sampling point 1, 2 and 3) (step 163). Then, an analysis model is created for each sampling point (the length of the fixed pitch of the pipe), a natural vibration value is obtained (step 164), and it is determined whether the natural vibration value satisfies the previously set strength determination value. Judgment is made (step 165), and if it is satisfied, the relationship between the intrinsic value of the fixed pitch of the pipe and the calculated natural frequency is shown by a polynomial, and the reference value of the fixed pitch of the pipe that satisfies the natural frequency as the strength determination value is set It is determined (step 166). As shown in FIG. 17, the polynomial is represented by a graph, and the contact point between the strength determination value and the graph of the polynomial is determined as a reference value of the fixed pipe pitch.

On the other hand, when the analyzed natural frequency does not satisfy the strength judgment value, for example, the sampling point 2 in FIG. 17 is at least two sampling points with fixed pipe pitches (sampling point 1 ′) around the natural frequency. And 2 ′) are extracted and returned to the above-described step 164 to analyze and obtain a natural frequency, create a polynomial, and determine a piping pitch suitable for the piping route (step 16).
7).

FIG. 18 is an example showing an optimum piping route displayed by replacing it with a coordinate system in order to obtain an optimum piping route.

According to the figure, when it has moved by y in the Y-axis direction from the pipe start point, it reaches the break point a of the pipe route. This means that, as described above, since the calculated natural frequency deviated from the set natural frequency as the strength determination value, the pipe fixing pitch was sampled again, and the reference value of the optimum pipe fixing pitch was calculated again. means. The same applies to break points b and c of other piping routes.

As described above, the pipe pitch calculating section 751
Is transmitted to the handy terminal 5a via the transmission / reception unit 701 and displayed on the display unit 501.

Thus, in addition to being able to calculate the optimum piping fixing pitch in an automated routine, the operator can proceed with the work while obtaining this optimum value.

[0087]

As described above, according to the vibration characteristic analysis system of the present invention, in order to analyze the natural frequency of the internal structure of the plant, from the preparation and setting of the apparatus to the evaluation of the measured and sampled values. Up to this point, it can be performed in a non-contact and automatic manner with the plant internal structure, so that it can be performed in a short time without being restricted by the plant internal structure.

Further, not only the natural frequency of the internal structure of the plant but also the temperature change can be similarly executed and corrected. Then, for the periodic inspection, the test results for the previous and current temperature changes can be compared based on the information stored in the database, so the work required for this inspection can be simplified and time can be reduced. .

Further, since the change in the vibration state of the plant internal structure and its vibration source is compared and taken into consideration, it is possible to diagnose the natural frequency of the plant internal structure to be measured and its installation state. it can.

Further, since it is determined whether or not the calibration test is necessary before the calibration test of the instrument is performed, it is not necessary to take time to perform the calibration test more than necessary. In addition, since the calibration test can be performed without installing a calibration instrument or performing wiring work, the time required for the test can be reduced.

Further, by providing the handy terminal with data input and display functions, bidirectional communication between the handy terminal and the computer becomes possible. For example, while a worker is at the work site, a request is issued to the computer (input). ) Or by looking at the display screen, an answer can be obtained, so that an environment that is easier for the worker to work can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of the present system.

FIG. 2 is a block diagram showing a configuration of an arithmetic unit used in the first embodiment.

FIG. 3 is a flowchart showing an analysis procedure of a natural frequency of the arithmetic unit used in the first embodiment.

FIG. 4 is a graph showing a relationship between a natural frequency and a value of a spring constant.

FIG. 5 is a block diagram showing a configuration of an arithmetic unit used in the second embodiment.

FIG. 6 is a block diagram illustrating a configuration of an arithmetic unit used in a third embodiment.

FIG. 7 is a block diagram showing a configuration of an arithmetic unit used in a fourth embodiment.

FIG. 8 is a flowchart showing a procedure for diagnosing the quality of an installed state in a plant internal structure according to a fourth embodiment.

FIG. 9 is a view showing a procedure for converting a vibration waveform used in the fourth embodiment.

FIG. 10 is a diagram showing a range for obtaining a difference between vibration waveforms used in the fourth embodiment.

FIG. 11 is a block diagram showing a configuration of an arithmetic unit used in a fifth embodiment.

FIG. 12 is a block diagram showing a configuration of a handy terminal and an arithmetic device used in a sixth embodiment.

FIG. 13 is a block diagram showing the configuration of the present system used in a seventh embodiment.

FIG. 14 is an exemplary flowchart showing the procedure of data processing between a handy terminal and an arithmetic unit used in the seventh embodiment;

FIG. 15 is a block diagram showing the configuration of the present system used in the eighth embodiment.

FIG. 16 is a flowchart showing a procedure for calculating a reference value of an optimal mounting pitch in the arithmetic unit used in the eighth embodiment.

FIG. 17 is a graph showing a relationship between a fixed pitch of a pipe and a natural frequency.

FIG. 18 is an example of an optimal piping route displayed by replacing with a coordinate system.

FIG. 19 is a block diagram showing a configuration of a conventional vibration measurement system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration characteristic analysis system 3 Instrument 5, 5a, 5b Handy terminal 7, 7a, 7b, 7c, 7d, 7e, 7f Arithmetic unit 701 Transmitter / receiver unit 704 Material characteristic database ... 706 Analysis model database 713 Accuracy error database 100 In plant Structure 101 Vibration source 102 Transmitter 103 Vibrometer

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2G064 AA01 AB19 CC54 CC57 CC59 CC70 2G075 AA01 BA01 BA17 CA02 CA13 CA49 DA13 DA18 EA01 EA08 FA02 FA11 FB01 FB05 FB07 FB09 FB16 FC14 GA15

Claims (9)

[Claims] 1. A handy terminal capable of inputting a measurement signal to a component constituting a plant via an instrument capable of non-contact measurement and communicating the measurement signal wirelessly with another device. Receiving the measurement signal by wireless communication from the handy terminal, based on the seismic evaluation information for each of the components and the analysis model information of the components created during the design of the plant with respect to the measurement signals, And a computing device for evaluating characteristics of the components. 2. The arithmetic and logic unit, comprising: a transmitting and receiving unit for performing wireless communication with the handy terminal; and an arithmetic processing for a signal indicating a vibration state among the measurement signals received via the transmitting and receiving unit. A vibration waveform calculation unit, a first database storing optimal design information at the time of design with respect to material properties of the component, and an optimal design information of a three-dimensional analysis model created for evaluating the strength of the component A second database storing: a calculation result of the vibration waveform calculation unit and a first extraction unit that extracts two or more approximate values before and after the calculation result as a center; An analysis model vibration updating unit that updates a second database; an analysis execution unit that analyzes a natural frequency based on a value updated by the analysis model vibration updating unit; On the basis of the order obtained analysis value,
The vibration characteristic analysis system according to claim 1, further comprising: a comparison unit that compares a spring constant that matches a vibration state of the component with a reference spring constant. 3. The vibration waveform calculating section obtains a natural frequency of an analysis model based on information indicating an installation strength of the component stored in the first database, and receives the natural frequency from the handy terminal during a periodic inspection. The vibration characteristic analysis system according to claim 2, wherein the measured signal is compared with a natural frequency and subjected to arithmetic processing. 4. The arithmetic unit includes: a transmitting / receiving unit that performs wireless communication with the handy terminal; a first database that stores optimal design information at the time of design with respect to material characteristics of the component; A second database storing the optimal design information of the three-dimensional analysis model created to evaluate the strength of the object, and receiving the temperature of the component as the measurement signal via the transmission / reception unit; A second extraction unit for extracting material characteristics of the constituent from the first database based on the first database, and an analysis model for updating the second database based on the material characteristics extracted by the second extraction unit A temperature update unit, an analysis execution unit that analyzes the natural frequency based on the value updated by the analysis model temperature update unit, and, based on the analysis value obtained by the analysis execution unit,
The vibration characteristic analysis system according to claim 1, further comprising: a comparison unit that compares a spring constant that matches a vibration state of the component with a reference spring constant. 5. The computing device, comprising: a transmitting / receiving unit that performs wireless communication with the handy terminal; a third database that stores, as information, an error of the component with respect to a design time; Receiving the measurement signals of the vibration source of the component that continuously or intermittently vibrate and the peripheral components surrounding the vibration source measured by the instrument, and transmitting these measurement signals to the A comparison data storage unit additionally stored in the database of 3; when the measurement signal of the peripheral component exceeds a preset alarm set value, an alarm is issued, and continuous before and after the occurrence of the alarm A difference calculation unit that calculates a difference between the measurement signals of the vibration source and the peripheral component in a time width to be performed, and a state of the peripheral component and the vibration source based on a result of the difference calculation unit. Vibration Analysis system according to claim 1, characterized by comprising a diagnosis unit for diagnosing. 6. The vibration waveform calculation unit receives, via the transmission / reception unit, the measurement signal of the measured installation location of the meter and the peripheral component that forms the vicinity of the installation location, and receives these signals. 3. The vibration characteristic analysis according to claim 2, wherein a difference between the measurement signals is calculated, and when a calculated absolute value of the difference exceeds a predetermined allowable value, an instruction to execute a calibration test of the instrument is issued. system. 7. The handy terminal, comprising: an input unit for inputting information; and a display unit for displaying a result of communication with the arithmetic device based on the input information of the input unit. 2. The vibration characteristic analysis system according to 1. 8. The vibration characteristic analysis system according to claim 7, wherein the handy terminal includes a receiver for receiving a signal transmitted from a transmitter installed for each process of the constituent. . 9. The vibration waveform calculation unit receives input information of the input unit via the transmission / reception unit,
The vibration characteristic analysis system according to claim 1, wherein a fixed pitch of piping installed in the plant is calculated.