JP2009300401A - System and method for plant monitoring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant monitoring system which simplifies component parts and control programs as much as possible to determine integrity of the plant and the plant equipment. <P>SOLUTION: This plant monitoring system includes an acceleration sensor 2 installed in the plant equipment 41 to measure information on the plant equipment 41, a recorder 3 equipped with wireless communication function for recording measurement information from the acceleration sensor 2, a base station 4 which provides wireless communication with the recorder 3, and a monitor 5 connected with the base station 4 to monitor condition of the plant equipment 41 or the plant 40 based on the measurement information for the plant equipment 41 recorded in the recorder 3. Further the monitor 5 includes a filter part 18 for passing measurement information of the acceleration sensor 2 through the desired frequency range, and a simple determination processor 19 which computes an evaluated value from component of the measurement information of the acceleration sensor 2 passed through the filter part 18 and then compares this evaluated value with simple determination threshold value to primarily determine condition of the plant equipment 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plant monitoring system and a plant monitoring method in which measurement information from a sensor installed in a plant device is recorded by a recording device, and the state of the plant and the plant device is monitored using this measurement information.

  In plants, vibrations and process values are constantly monitored online or regularly offline for the purpose of early detection of abnormalities occurring in the plant and the plant equipment that constitutes the plant, and maintaining and ensuring its soundness. Monitoring.

  In general, in online monitoring, a detector installed on an object to be monitored, a signal cable for transmitting data detected by the detector, and a data collection and monitoring device installed in a central control room and connected to the signal cable. An equipped plant monitoring system is used. The signal cable is laid in the plant. The data collection and monitoring device receives data stored by the detector via the signal cable, stores it, and performs analysis processing. On-line monitoring is also being performed using a plant monitoring system that transmits and receives data between a detector and a data collection and monitoring device using a telephone communication line such as PHS installed in the plant.

  On the other hand, in offline monitoring, a plant monitoring system in which a detector is permanently or temporarily installed on an object to be monitored, a portable recording terminal is brought to the site, and data detected by the detector is received and recorded by the portable recording terminal. A system is used.

  For example, in the plant monitoring system described in Patent Document 1, the open / closed state of a valve is read from the output of a sensor attached to the valve and inspected via a repeater.

  In a conventional plant monitoring system, a detector such as an accelerometer or displacement meter is installed in a rotating device that is a plant device, and the acceleration vibration of the bearing portion and the amount of displacement of the rotating shaft are measured. There has been proposed a monitoring system that monitors the amount of change in the vibration component synchronized with the rotational speed, detects the abnormality of the rotating device early, estimates the cause of the abnormality, and supports the countermeasure.

  However, in the online monitoring system in which the detector and the data collection and monitoring device are connected by a signal cable as in the plant monitoring system described in Patent Document 1, the installation range and the number of installation points of the detector are limited, When multipoint monitoring or a wide range of monitoring is required, the monitoring system has a large-scale configuration. In addition, when a telephone communication line such as PHS is used for transmission and reception of data between the detector and the data collection and monitoring device, the use of the telephone in the plant is primarily intended and the number of lines is limited. Therefore, it is not desirable to occupy this telephone communication line for data communication.

  Therefore, in the plant monitoring system described in Patent Document 2, a number of data collectors (sensor network terminals) called wireless sensors, which are a combination of a detector and a small wireless communication device, are arranged in the plant and detected by the detector. A monitoring system that collects data by wireless transmission has been proposed. Since this monitoring system transmits data detected by wireless communication, there is no need to lay signal cables from the respective detectors to the data collection and monitoring device, and a wide range and multipoint monitoring is possible in the plant.

In addition, for offline monitoring systems, the number of monitored objects is large and distributed over a wide range when inspected by inspectors, so wireless sensors are installed on the monitored objects in advance, and the inspectors approach during the patrol. There has been proposed a monitoring system capable of receiving data transmitted by a wireless sensor with a portable recording terminal.
JP 2005-308540 A JP 2005-164315 A

  Most of wireless sensors are equipped with a battery as a power source or convert external energy into a power source. In the case of a battery, its capacity is limited and must be replaced. Moreover, what converts external energy into a power source has problems such as an increase in the size of the conversion unit in order to obtain sufficient power. In order to solve these problems, it is necessary to save power of the wireless sensor.

  In order to save power of a wireless sensor, in terms of its configuration, it is necessary to simplify the component configuration and reduce power consumption by reducing the number of components and using low-performance components. On the other hand, in terms of the operation of the wireless sensor, it is necessary to devise control such as shortening the time during which the component operates or suppressing power consumption when the operation is unnecessary. Such control of the operation of the wireless sensor is performed by a control program recorded in a memory area constituting the wireless sensor.

  In the control program that optimizes the operation from the viewpoint of power consumption, the size of the program increases due to an increase in the number of operation mode control cases. Then, it is necessary to increase the memory area for recording the enlarged control program, which conflicts with the simplification of the component configuration. Therefore, it is necessary to simplify the control program as much as possible in order to reduce the power consumption of the entire wireless sensor.

  In the case of a monitoring system that measures vibration, analyzes it, and compares it with a set monitoring threshold to determine the soundness of the plant and plant equipment, the acceleration is often measured using an accelerometer in the sensor part of the detector. Measure and calculate the speed and displacement from this acceleration to determine the soundness of the plant and plant equipment. In this case, an integration circuit for calculating the speed and displacement from the acceleration is required. Alternatively, a calculation program for converting acceleration to speed and displacement must be installed in the memory area. Increasing the number of components constituting the integration circuit in the wireless sensor or increasing the memory area as the arithmetic program is installed increases the power consumption of the wireless sensor.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a plant monitoring system capable of simplifying components and control programs as much as possible and determining the soundness of plants and plant equipment.

  In order to solve the above problems, in the present invention, an acceleration sensor that is installed in plant equipment and measures information related to the plant equipment, a recording device that records measurement information from the acceleration sensor and has a wireless communication function, and A base station that performs wireless communication with a recording device, and a monitoring device that is connected to the base station and that monitors the state of the plant equipment or plant based on measurement information related to the plant equipment recorded by the recording device The recording device calculates an evaluation value from a component of the measurement information of the acceleration sensor that has passed through the filter unit, a filter unit that passes the desired frequency range of the measurement information of the acceleration sensor, and the evaluation And a simple judgment processing unit that compares the value with the simple judgment threshold to determine the state of the plant equipment temporarily. To.

  Further, according to the present invention, the recording device records measurement information related to plant equipment from an acceleration sensor, the recording device transmits the measurement information to a monitoring device via a base station, and the monitoring device transmits the measurement information. A plant monitoring method for monitoring plant equipment or a state of a plant from information, wherein the recording device outputs measurement information of the acceleration sensor to a simple determination processing unit through a filter unit through which a desired frequency range passes, and The determination processing unit calculates an evaluation value from the measurement information component of the acceleration sensor that has passed through the filter unit, and compares the evaluation value with a simple determination threshold value to primarily determine the state of the plant equipment. It is characterized by that.

  According to the present invention, it is possible to provide a plant monitoring system that simplifies component parts and control programs as much as possible and can determine the soundness of plants and plant equipment.

  A plant monitoring system according to the present invention will be described with reference to FIGS.

  FIG. 1 is a wireless network diagram showing a configuration of a plant monitoring system according to the present invention.

  As shown in FIG. 1, the plant 40 includes a plurality of plant devices 41 and a plant monitoring system 1. The plant monitoring system 1 is installed in the plant equipment 41, records at least one acceleration sensor 2 that measures information related to the plant equipment 41, and is connected to the acceleration sensor 2 to record measurement information from the acceleration sensor 2 and has a wireless communication function. , A base station 4 that performs wireless communication W between at least one recording device 3, connected to the base station 4 to control operations of the recording device 3 and the base station 4, and And a monitoring device 5 for monitoring the state of the entire plant 40 or the plant equipment 41 based on the measurement information recorded by the recording device 3.

  In the plant monitoring system 1, the monitoring device 5 is connected to the base station 4 and can move between the monitoring device 5 and the base station 4. When the inspector possesses and moves the monitoring device 5, the monitoring device 5 can establish communication with the recording device 3 in a range where wireless communication is possible via the base station 4.

  The recording device 3 has a function of performing wireless communication with the base station 4 or another recording device 3. Since a plurality of recording devices 3 can wirelessly communicate with each other, the control signal and the measurement information measured by the acceleration sensor 2 can be relayed to and received from the monitoring device 5 via the base station 4. it can.

  FIG. 2 is a wireless network diagram showing another example of the plant monitoring system according to the present invention.

  As shown in FIG. 2, in a plant monitoring system 1A provided in a plant 40, a base station 4 is connected to a communication line 6 such as a LAN in the plant. The monitoring device 5 can communicate with the recording device 3 through a plurality of base stations 4 installed at various locations in the plant 40.

  FIG. 3 is a block diagram showing the configuration of the recording device of the plant monitoring system according to the present invention.

  As illustrated in FIG. 3, the recording device 3 includes a first determination processing unit 9, a recording unit 10, a wireless transmission / reception unit 11, a time measuring function unit 12, a CPU 13, and a power supply unit 14.

  The first determination processing unit 9 is connected to at least one acceleration sensor 2 installed in a plant device 41 as a monitoring target device. Further, the first determination processing unit 9 pays attention to the component of the measurement information in the desired frequency range among the measurement information related to the plant equipment 41 measured by the acceleration sensor 2, and the simple determination threshold recorded in the recording unit 10. The state of the plant equipment 41 is primarily determined by comparison with the value.

  The first determination processing unit 9 includes an A / D conversion unit 17, a filter unit 18, and a simple determination processing unit 19.

  The A / D conversion unit 17 is connected to at least one acceleration sensor 2 installed in a plant device 41 as a monitoring target device, and digitally measures measurement information that is an analog signal related to the plant device 41 measured by the acceleration sensor 2. Convert to signal. Here, the measurement information is a vibration waveform of the plant equipment 41 and a physical quantity representing the state of the plant equipment 41. A digital signal of measurement information output from the A / D conversion unit 17 is temporarily recorded and stored in a memory (not shown) or the recording unit 10.

  The filter unit 18 is a so-called band-pass filter (band-pass filter) that allows only the measurement information component in a desired frequency range to pass through the digital signal of the measurement information converted by the A / D conversion unit 17. The filter unit 18 can use a high-pass filter or a low-pass filter in accordance with the properties of the plant equipment 41.

  The simple determination processing unit 19 calculates an evaluation value corresponding to a component of measurement information in a desired frequency range that has passed through the filter unit 18, and compares this evaluation value with a simple determination threshold value corresponding to the plant equipment 41. Thus, the state of the plant equipment 41 is temporarily determined. When the evaluation value exceeds the simple determination threshold value, the digital signal of the measurement information is stored in the recording unit 10 and the evaluation value exceeds the simple determination threshold value in the base station 4 via the wireless transmission / reception unit 11 Notify that. Further, when the evaluation value exceeds the simple determination threshold, a digital signal of measurement information can be transmitted to the base station 4 via the wireless transmission / reception unit 11.

  Here, the component of measurement information in a desired frequency range is a range based on a characteristic frequency such as a frequency generated when an abnormality occurs in the plant equipment 41 or a natural frequency of the equipment. For example, in the case of a rotary machine, the characteristic frequency refers to a rotation frequency of the shaft system, a frequency that is a multiple of the rotation frequency, or a characteristic frequency that occurs when a rolling bearing is damaged. Further, it refers to the natural frequency obtained from the eigenvalue analysis of the plant equipment 41 and the measurement of the attenuation waveform.

  The simple determination threshold is an upper limit value of the speed component Vlmt and the displacement component Dlmt in a desired frequency range.

  Furthermore, the evaluation value is a component of measurement information in a desired frequency range, that is, the velocity V and displacement D of the plant equipment 41 calculated from the acceleration waveform, and [Equation 1], [Equation 2], [Equation 3] and Calculated by [Equation 4]. In addition, when calculating and determining an evaluation value from the effective value arms of the acceleration waveform, [Equation 1] and [Equation 2] are used, and the evaluation value is calculated and determined from the maximum value amax of the absolute value of the acceleration waveform. In this case, [Equation 3] and [Equation 4] are used.

  That is, the recording device 3 includes the filter unit 18 that allows a desired frequency range to pass through, so that the speed V and the displacement D are simply calculated from the acceleration waveform, and the state of the plant equipment 41 is temporarily determined.

The velocity V and the displacement D, which are evaluation values, are calculated as follows.
[Equation 1]
Vrms = arms / (2 × π × f)
Vrms: Speed (effective value)
arms: Acceleration (RMS)
π: Circumference ratio f: Characteristic frequency [Equation 2]
D = √2 × arms / (2 × π × f) ²
D: Displacement arms: Acceleration (RMS)
π: Circumference ratio f: Characteristic frequency [Equation 3]
Vmax = amax / (2 × π × f)
Vmax: speed amax: acceleration (maximum absolute value)
π: Circumference f: Feature frequency [Equation 4]
D = amax / (2 × π × f) ²
D: Displacement amax: Acceleration (maximum absolute value)
π: Circumference ratio f: Characteristic frequency

  Specifically, when calculating and determining the evaluation value from the effective value arms of the acceleration waveform, the component of the measurement information in the desired frequency range, that is, calculating the effective value arms of the acceleration waveform in the desired frequency range, Then, the effective value Vrms and displacement D of the velocity are obtained from the effective value arms by [Equation 1] and [Equation 2], and the effective velocity value Vrms and displacement D of the velocity and the velocity component in a desired frequency range which is a simple determination threshold Vlmt and displacement component Dlmt are compared. When one or both of the effective velocity value Vrms and the displacement D exceed the velocity component Vlmt and the displacement component Dlmt, the simple determination processing unit 19 records and stores a digital signal of measurement information in the recording unit 10. . At this time, the simple determination processing unit 19 can also record and store the effective acceleration value arms together with the digital signal of the measurement information in the recording unit 10.

  In the case where the evaluation value is calculated and determined from the maximum value amax of the absolute value of the acceleration waveform, the maximum value amax of the absolute value is searched from the measurement information component in the desired frequency range, that is, the acceleration waveform in the desired frequency range. Then, the velocity Vmax and the displacement D are obtained from the maximum value amax of the acceleration by [Equation 3] and [Equation 4], and the velocity Vmax and the displacement D and a simple determination threshold value in a desired frequency range. The velocity component Vlmt and the displacement component Dlmt are compared. When one or both of the velocity Vmax and the displacement D exceed the velocity component Vlmt and the displacement component Dlmt, the simple determination processing unit 19 records and stores a digital signal of measurement information in the recording unit 10. At this time, the simple determination processing unit 19 can also record and store the maximum value amax of the absolute value of acceleration in the recording unit 10 together with the digital signal of the measurement information.

  Note that the velocity component Vlmt and the displacement component Dlmt in the desired frequency range, which are simple determination threshold values, are either [Equation 1] and [Equation 2] or [Equation 3] and [Equation 4] temporarily. Depending on whether or not it is used for the determination, it is set as required from the characteristic frequency of the plant equipment 41.

  The recording unit 10 includes at least an identifier of itself, an identifier of another communicable recording device 3, an arithmetic program for calculating [Equation 1] and [Equation 2] and an effective value of the acceleration waveform, or [Equation 3] and [Equation 3]. [Expression 4] and a calculation program for searching for the maximum absolute value of acceleration, a control program for the recording device 3, a characteristic frequency of the plant equipment 41, and a simple determination threshold value are recorded and stored. In addition, measurement information converted into a digital signal by the A / D conversion unit 17 can be recorded and stored.

  The wireless transmission / reception unit 11 wirelessly communicates information such as a control signal, a digital signal of measurement information, and an identifier of the recording device 3 with the base station 4 or another recording device 3. Information such as digital signals of measurement information stored in the recording unit 10 is transmitted from the monitoring device 5 via the base station 4 or the base station 4 and other recording devices 3 by the wireless transmission / reception unit 11. Is transmitted wirelessly to the monitoring device 5 via the base station 4 or the base station 4 and another recording device 3.

  The timekeeping function unit 12 is built in the recording device 3 to keep track of time, and the time lag is corrected by accurate time information transmitted from the monitoring device 5 via the base station 4.

  The CPU 13 controls the first determination processing unit 9, the recording unit 10, the wireless transmission / reception unit 11, the time measuring function unit 12, and the power supply unit 14 of the recording device 3.

  The power supply unit 14 supplies power to the first determination processing unit 9, the recording unit 10, the wireless transmission / reception unit 11, the time measuring function unit 12, and the CPU 13 of the recording device 3. As the power supply unit 14, a primary battery or a secondary battery can be used. In addition, it is preferable to use a solar cell (photoelectric conversion element) or a thermoelectric conversion element that can generate electric power due to a temperature difference, or the like that can generate electric power using external energy.

  The recording device 3 can be controlled from the monitoring device 5 via the base station 4. For example, measurement information stored in the recording unit 10 can be transmitted from the recording device 3 to the monitoring device 5 according to a command from the monitoring device 5.

  The recording unit 10 can store operating conditions related to time such as the start time, operating time, and inspection period of the plant 40 or the plant equipment 41. Based on this operation condition, the CPU 13 of the recording device 3 controls the first determination processing unit 9, the recording unit 10, the wireless transmission / reception unit 11, and the power supply unit 14 to operate the recording device 3. The operating conditions are created by the monitoring device 5 based on the operation schedule or inspection schedule of the plant 40 or the plant equipment 41, transmitted to the recording device 3, and recorded and stored in the recording unit 10 of the recording device 3. Is done. In the plant equipment 41, there are a time when monitoring is necessary and a time when monitoring is not necessary depending on the operation state of the plant 40 such as at the time of start-up, normal operation, stop, and periodic inspection. The operating conditions reflect this. The CPU 13 of the recording device 3 operates the recording device 3 periodically according to the operating conditions, and switches the operation mode to one of a plurality of operation modes set according to the operating conditions.

  FIG. 4 is a block diagram showing the configuration of the base station of the plant monitoring system according to the present invention.

  As shown in FIG. 4, the base station 4 includes a wireless transmission / reception unit 21, a communication unit 22, a recording unit 23, a time measuring function unit 24, a CPU 25, and a power supply unit 26.

  The wireless transmission / reception unit 21 performs a function of performing wireless communication with the recording device 3.

  The communication unit 22 performs communication with the monitoring device 5.

  The recording unit 23 records and stores its own identifier and the control program of the base station 4. Further, the measurement information transmitted from the recording device 3 is temporarily stored.

  The time measuring function unit 24 is built in the base station 4 to keep time, and the time lag is corrected by accurate time information transmitted from the monitoring device 5 via the communication unit 22.

  The CPU 25 controls the wireless transmission / reception unit 21, the communication unit 22, the recording unit 23, the time measuring function unit 24, and the power supply unit 26.

  The power supply unit 26 supplies power to the radio transceiver unit 21, the communication unit 22, the recording unit 23, the time measuring function unit 24, and the CPU 25 of the base station 4 in order to drive them.

  FIG. 5 is a block diagram showing the configuration of the monitoring device of the plant monitoring system according to the present invention.

  As shown in FIG. 5, the monitoring device 5 includes a communication unit 29, a device information management unit 30, a second determination processing unit 31, a schedule information unit 32, a display unit 33, an input unit 34, and a timekeeping function. A unit 35, a CPU 36, and a power source unit 37 are included. The monitoring device 5 is installed in the plant or in a central control room or office in a remote place away from the plant.

  The communication unit 29 performs communication with the base station 4.

  The equipment information management unit 30 details the identification information of each plant equipment 41 such as the name and installation location of each plant equipment 41 to be monitored, the measurement information related to the plant equipment 41 recorded in the recording device 3, and the state of the plant equipment 41 in detail. Manages detailed decision thresholds for making decisions.

  The second determination processing unit 31 compares the measurement information of each plant device 41 managed by the device information management unit 30 with the detailed determination threshold value corresponding to each plant device 41 to determine the state of the plant device 41. Judge in detail and monitor.

  Specifically, for example, the measurement waveform related to the plant equipment 41 recorded in the recording device 3, that is, the velocity waveform and the displacement waveform are obtained by an integration circuit that calculates the velocity and displacement from the acceleration waveform, and the velocity waveform and the displacement waveform are subjected to frequency analysis. Then, the state of the plant device 41 is determined in detail and monitored by comparing with the detailed determination threshold value at the characteristic frequency for each plant device 41.

  The schedule information unit 32 holds an operation schedule, an inspection schedule, and the like of the plant 40 and each plant device 41.

  The display unit 33 displays monitoring information such as the state of the plant equipment 41 determined by the second determination processing unit 31 together with the determination result.

  The input unit 34 receives an operation input of the monitoring device 5. For example, when the recording device 3 notifies the measurement information of the plant equipment 41 that the component of the measurement information in the desired frequency range has exceeded the simple determination threshold, the recording device is operated by an operation input from the input unit 34. 3 can transmit measurement information.

  The time measuring function unit 35 holds an accurate time. The time information of the time measuring function unit 35 is transmitted to the recording device 3 and the base station 4.

  The CPU 36 controls the communication unit 29, the device information management unit 30, the second determination processing unit 31, the schedule information unit 32, the display unit 33, the time measuring function unit 35, and the power supply unit 37. For example, the CPU 36 controls the communication unit 29. Then, the recording device 3 is instructed to record and transmit the measurement information.

  The power supply unit 37 supplies power to the communication unit 29, the device information management unit 30, the second determination processing unit 31, the schedule information unit 32, the display unit 33, the time measuring function unit 35, and the CPU 36.

  Next, an operation when online monitoring is performed on the plant 40 or the plant equipment 41 using the plant monitoring system 1 will be described.

  FIG. 6 is a flowchart showing the plant monitoring operation of the plant monitoring system according to the present invention.

  As shown in FIG. 6, first, in step S <b> 1, the CPU 13 of the recording device 3 acquires measurement information related to the plant equipment 41 from the acceleration sensor 2 to the first determination processing unit 9.

  Next, in step S <b> 2, the A / D conversion unit 17 of the first determination processing unit 9 converts measurement information acquired from the acceleration sensor 2 from an analog signal to a digital signal and outputs the converted signal to the filter unit 18.

  Next, in step S <b> 3, the CPU 13 of the recording device 3 temporarily stores the digital signal of measurement information output from the A / D conversion unit 17 in the memory or the recording unit 10.

  Next, in step S <b> 4, the filter unit 18 of the first determination processing unit 9 filters the digital signal of the measurement information input from the A / D conversion unit 17, and only the measurement information component in the desired frequency range. Is output to the simple determination processing unit 19.

  Next, in step S5, the simple determination processing unit 19 of the first determination processing unit 9 searches for the maximum value amax of the absolute value from the measurement information in the desired frequency range input from the filter unit 18, that is, the acceleration waveform, or The effective value arms is calculated.

  Next, in step S6, the simple determination processing unit 19 of the first determination processing unit 9 uses the [Equation 1] and [Equation 2] from the effective value arms of the acceleration waveform to evaluate the value, that is, the effective value Vrms of the velocity and The displacement D is obtained, or the evaluation values, that is, the velocity Vmax and the displacement D are obtained from the maximum value amax of the acceleration waveform using [Equation 3] and [Equation 4].

  Next, in step S7, the simple determination processing unit 19 of the first determination processing unit 9 evaluates the velocity component Vlmt and the displacement component Dlmt in the desired frequency range, which are simple determination threshold values stored in the recording unit 10, and evaluation. The effective speed Vrms and displacement D, or the speed Vmax and displacement D, which are values, are compared to make a primary determination. When the effective velocity value Vrms and displacement D or the velocity Vmax and displacement D exceed the velocity component Vlmt and the displacement component Dlmt, the process proceeds to step S8. If the effective velocity value Vrms and the displacement D or the velocity Vmax and the displacement D do not exceed the velocity component Vlmt and the displacement component Dlmt, the processing ends.

  Next, in step S <b> 8, the CPU 13 of the recording device 3 stores a digital signal of measurement information temporarily stored in the memory or the recording unit 10 in the recording unit 10.

  Next, in step S9, the CPU 13 of the recording device 3 notifies the monitoring device 5 from the wireless transmission / reception unit 11 via the base station 4 that the primary determination result has exceeded the simple determination threshold value, and performs processing. finish. At this time, it is possible to notify that the result of the primary determination has exceeded the simple determination threshold, and to transmit a digital signal of measurement information to the monitoring device 5.

  When the plant monitoring operation is continuously performed, after the processing of the plant monitoring operation is completed, the process returns to the start and the plant monitoring operation is continued.

  Next, another example of the operation when online monitoring is performed on the plant 40 or the plant equipment 41 using the plant monitoring system 1 will be described.

  FIG. 7 is a flowchart showing another example of the plant monitoring operation of the plant monitoring system according to the present invention.

  Note that the processing from step S1 to step S7 in FIG. 7 is the same as the processing from step S1 to step S7 in FIG.

  As shown in FIG. 6, in step S <b> 10, the simple determination processing unit 19 of the first determination processing unit 9 stores the maximum acceleration value amax or effective value arms calculated in step S <b> 5 and the recording unit 10. Before the current process, the maximum value amax or the effective value arms of the acceleration is compared when the primary determination result exceeds the simple determination threshold value. The maximum acceleration amax or the effective value arms calculated in step S5 is the acceleration when the primary determination result exceeds the simple determination threshold before the current process stored in the recording unit 10. If the absolute value is larger than the maximum value amax or the effective value arms, the process proceeds to step S8A. The maximum acceleration amax or the effective value arms calculated in step S5 is the acceleration when the primary determination result exceeds the simple determination threshold before the current process stored in the recording unit 10. If the absolute value is not larger than the maximum value amax or the effective value arms, the process proceeds to step S11.

  Next, in step S8A, the CPU 13 of the recording device 3 uses the digital signal of the measurement information temporarily stored in the memory or the recording unit 10, and the maximum absolute value amax or effective value arms of the acceleration calculated in step S5. Is stored in the recording unit 10 and the process proceeds to step S9A.

  Next, in step S11, the absolute maximum value amax or effective value arms of acceleration calculated in step S5 is stored in the recording unit 10, and the process proceeds to step S9A.

  Next, in step S9A, the CPU 13 of the recording device 3 notifies the monitoring device 5 from the wireless transmission / reception unit 11 via the base station 4 that the primary determination result has exceeded the simple determination threshold value, and performs processing. finish. At this time, the monitoring device 5 notifies that the result of the primary determination has exceeded the simple determination threshold, and the digital signal of the measurement information and the maximum value amax or the effective value arms of the absolute values of all stored accelerations. Can also be sent to.

  When the plant monitoring operation is continuously performed, after the processing of the plant monitoring operation is completed, the process returns to the start and the plant monitoring operation is continued.

  Therefore, the recording device 3 stores the maximum absolute value amax or the execution value arms calculated from the measurement information component of the acceleration sensor 2 in the recording unit 10 and is calculated from the measurement information component of the acceleration sensor 2. Measurement information of the acceleration sensor 2 that maximizes the maximum absolute value amax or the execution value arms is stored in the recording unit 10.

  When the monitoring device 5 is notified from the recording device 3 that the result of the primary determination has exceeded the simple determination threshold, the second determination processing unit 31 of the monitoring device 5 executes the integration circuit, the numerical calculation program, and the control program. The velocity and displacement are calculated from the acceleration waveform, the velocity waveform and the displacement waveform are obtained, the velocity waveform and the displacement waveform are subjected to frequency analysis, and compared with the detailed determination threshold value at the characteristic frequency for each plant device 41, The state of the device 41 is determined in detail.

  When the detailed determination result exceeds the detailed determination threshold value in the second determination processing unit 31 of the monitoring device 5, a message to that effect is displayed on the display unit 33 of the monitoring device 5. Specifically, a warning is displayed together with the identification information of the plant equipment 41.

  According to the plant monitoring system 1 according to the present embodiment, the state of the plant equipment 41 in the plant 40 can be grasped at a remote place such as an office with a monitoring device 5 or a central operation room.

  In general, in the case of a conventional plant monitoring system that measures the vibration of the plant 40 or the plant equipment 41 and monitors the state of the plant 40 or the plant equipment 41 based on a preset determination threshold value, the acceleration sensor 2 is used. The acceleration is measured, the acceleration waveform is integrated to calculate the velocity waveform and the displacement waveform, and the status of the plant 40 or the plant equipment 41 is determined. In the case of such a conventional plant monitoring system, it is necessary to provide an integration circuit, a numerical calculation program, and a control program for calculating a velocity waveform and a displacement waveform from an acceleration waveform. When this integration circuit, numerical calculation program, and control program are installed in the recording device 3, the number of components of the recording device 3 is increased and the amount of the control program is increased, making it difficult to save power in the recording device 3. Met. For example, in the case of a conventional plant monitoring system that performs frequency analysis such as FFT on the acceleration waveform acquired from the acceleration sensor 2 and calculates the velocity amplitude and displacement amplitude of the characteristic frequency to monitor the status of the plant 40 or the plant equipment 41. Requires a numerical calculation program used for frequency analysis, and requires a memory area for storing the numerical calculation program and processing frequency analysis. In addition, power for operating the CPU and memory is consumed during frequency analysis, making it difficult to save power in the recording device 3.

  According to the recording device 3 of the plant monitoring system 1 according to the present embodiment, a complicated numerical calculation such as integration is performed from the acceleration waveform acquired from the acceleration sensor 2 by including the filter unit 18 that allows a desired frequency range to pass. As shown in [Equation 1] to [Equation 4], the speed and displacement can be easily calculated. As a result, the recording device 3 does not require an integration circuit, a control program, or a complicated numerical calculation program to be mounted, and power saving of the recording device 3 can be achieved. Further, it is not necessary to record and save a program such as a control program or a numerical calculation program, and it is not necessary to secure a memory area used at the time of execution, and power saving can be achieved from the viewpoint of the configuration of the recording device 3. .

  Therefore, according to the plant monitoring system 1 which concerns on this invention, a component and a control program can be simplified as much as possible, and the soundness of the plant 40 and the plant equipment 41 can be determined.

The wireless network figure which shows the structure of the plant monitoring system which concerns on this invention. The wireless network figure which shows the other example of the plant monitoring system which concerns on this invention. The block diagram which shows the structure of the recording device of the plant monitoring system which concerns on this invention. The block diagram which shows the structure of the base station of the plant monitoring system which concerns on this invention. The block diagram which shows the structure of the monitoring apparatus of the plant monitoring system which concerns on this invention. The flowchart which shows the plant monitoring operation | movement of the plant monitoring system which concerns on this invention. The flowchart which shows the other example of the plant monitoring operation | movement of the plant monitoring system which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plant monitoring system 2 Acceleration sensor 3 Recording apparatus 4 Base station 5 Monitoring apparatus 6 Communication line 9 First determination processing part 10 Recording part 11 Wireless transmission / reception part 12 Timekeeping function part 13 CPU
14 Power supply unit 17 A / D conversion unit 18 Filter unit 19 Simple determination processing unit 21 Wireless transmission / reception unit 22 Communication unit 23 Recording unit 24 Timekeeping function unit 25 CPU
26 Power supply unit 29 Communication unit 30 Device information management unit 31 Second determination processing unit 32 Schedule information unit 33 Display unit 34 Input unit 35 Timekeeping function unit 36 CPU
37 Power supply unit 40 Plant 41 Plant equipment

Claims (7)

An acceleration sensor installed in the plant equipment and measuring information on the plant equipment;
A recording device that records measurement information from the acceleration sensor and has a wireless communication function;
A base station that performs wireless communication with the recording device; and
A monitoring device connected to the base station, based on measurement information relating to the plant equipment recorded by the recording device, and monitoring the state of the plant equipment or plant;
The recording apparatus calculates an evaluation value from a filter unit that passes a desired frequency range for measurement information of the acceleration sensor, and a component of measurement information of the acceleration sensor that has passed through the filter unit, and the evaluation value and simple determination A plant monitoring system, comprising: a simple determination processing unit that compares a threshold value and temporarily determines the state of a plant device. The recording device is:
The plant monitoring system according to claim 1, wherein when the evaluation value exceeds the simple determination threshold, the monitoring device is notified that the evaluation value has exceeded the simple determination threshold. The recording device includes a recording unit that stores measurement information of the acceleration sensor,
The plant monitoring system according to claim 1 or 2, wherein when the evaluation value exceeds the simple determination threshold value, measurement information of the acceleration sensor is transmitted to the monitoring device. 4. The filter according to claim 1, wherein the filter unit passes a frequency range based on a frequency generated when an abnormality occurs in the plant equipment or a natural frequency of the plant equipment. 5. The plant monitoring system described. The recording unit stores the frequency generated when an abnormality occurs in the plant equipment or the characteristic frequency at the natural frequency of the plant equipment, and from the measurement information component of the acceleration sensor that has passed through the filter unit. 5. The speed or displacement is calculated by multiplying the calculated maximum value or execution value of the absolute value and the characteristic frequency, and is compared with the simple determination threshold value. 6. The plant monitoring system according to item. The recording device is:
While storing the maximum value or execution value of the absolute value calculated from the measurement information component of the acceleration sensor in the recording unit,
The measurement information of the acceleration sensor that maximizes the maximum absolute value or the execution value calculated from the measurement information component of the acceleration sensor is stored in the recording unit. The plant monitoring system according to item 1. The recording device records measurement information about plant equipment from the acceleration sensor,
The recording device transmits the measurement information to the monitoring device via a base station by wireless communication,
The monitoring device is a plant monitoring method for monitoring the state of plant equipment or a plant from the measurement information,
The recording device outputs measurement information of the acceleration sensor to a simple determination processing unit through a filter unit through which a desired frequency range passes,
The simple determination processing unit calculates an evaluation value from a component of measurement information of the acceleration sensor that has passed through the filter unit, and compares the evaluation value with a simple determination threshold value to temporarily determine the state of the plant equipment. The plant monitoring method characterized by determining.

Images