JP2021096111A - State determination device and state determination method - Google Patents

Abstract

To provide a state determination device and state determination method capable of determining a state of a device having a moving body changing a flow of a fluid with higher accuracy.SOLUTION: A state determination device includes a first calculation section, a second calculation section, and a state determination section. The first calculation section calculates a first feature quantity related to operation energy to a moving body changing a flow of a fluid in a flow passage. The second calculation section calculates a second feature quantity related to pressure of the fluid. The state determination section determines a state in the flow passage on the basis of the second feature quantity when the first feature quantity is within a predetermined range.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a state determination device and a state determination method.

The flow path is opened and closed by rotating or translating the valve provided in the pipe. In the state determination of the valve device having these valves, the state determination is performed by analyzing the information obtained from the sensors that measure various operations of the valve device.

However, with such a state determination device, it is difficult to determine whether an abnormality has occurred in the sensor or an abnormality other than the sensor of the valve device.

Japanese Unexamined Patent Publication No. 11-210921 JP-A-2018-413326 Japanese Patent No. 3864875

An object to be solved by the present invention is to provide a state determination device capable of determining the state of an apparatus having a moving body that changes the flow of a fluid with higher accuracy, and a state determination method.

The state determination device according to the present embodiment includes a first calculation unit, a second calculation unit, and a state determination unit. The first calculation unit calculates the first feature amount related to the operating energy to the moving body that changes the flow of the fluid in the flow path. The second calculation unit calculates the second feature amount related to the pressure of the fluid. When the first feature amount is within the predetermined range, the state determination unit determines the state in the flow path based on the second feature amount.

According to the present embodiment, it is possible to determine the state of the device having the moving body that changes the flow of the fluid with higher accuracy.

The block diagram which shows the structure of the state determination apparatus which concerns on this embodiment. The figure which shows the closed state which stops a fluid in a flow path. The figure which shows the open state which circulates fluid in a flow path. The figure which shows the example of the feature amount used in the determination part. The flowchart which shows the flow of the judgment process in the state judgment apparatus.

Hereinafter, the state determination device and the state determination method according to the embodiment of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of the embodiments of the present invention, and the present invention is not construed as being limited to these embodiments. Further, in the drawings referred to in the present embodiment, the same parts or parts having similar functions are designated by the same reference numerals or similar reference numerals, and the repeated description thereof may be omitted. In addition, the dimensional ratio of the drawing may differ from the actual ratio for convenience of explanation, or a part of the configuration may be omitted from the drawing.

(First Embodiment)

FIG. 1 is a block diagram showing a configuration of a state determination system 1 according to the present embodiment. A configuration example of the state determination device 1 will be described with reference to FIG. As shown in FIG. 1, the state determination system 1 according to the present embodiment is a system that determines the state of an apparatus having a moving body that changes the flow of fluid. The state determination system 1 includes a valve device 10, a measuring instrument 20, a command device 30, and a state determination device 40. Further, the state determination device 40 includes an acquisition unit 50 and a determination unit 60. The determination unit 60 includes a first calculation unit 602, a second calculation unit 604, a storage unit 606, a statistic calculation unit 608, a setting unit 610, and a state determination unit 612.

The valve device 10 is a device having a moving body that changes the flow of fluid. The valve device 10 is, for example, a ball valve having a ball valve.

The measuring instrument 20 measures a physical quantity related to the state of the valve device 10. The measuring instrument 20 is, for example, a first measuring unit that measures a first measured value related to operating energy to a moving body that changes the flow of a fluid in a flow path, and a second measuring unit that acquires a second measured value related to a fluid pressure. Has 2 measuring units

Here, a configuration example of the valve device 10 and a configuration example of the measuring instrument 20 will be described with reference to FIGS. 2 and 3.
2 and 3 are diagrams showing a configuration example of the valve device 10 and a configuration example of the measuring instrument 20. FIG. 2 is a diagram showing a closed state in which a fluid such as hydrogen is stopped in the flow path 100a. FIG. 3 is a diagram showing an open state in which a fluid is circulated in the flow path 100a. Further, FIGS. 2 and 3 show a cross-sectional view of the valve box 100. The fluid according to the present embodiment is a gas, but the present invention is not limited to this, and a liquid such as water may be used.

As shown in FIGS. 2 and 3, the valve device 10 includes, for example, a valve box 100, a valve body 102, and a drive unit 104. The valve box 100 has a flow path 100a and arranges a valve body 102 which is a moving body. The valve body 102 is a sphere with a hole 102a. The valve body 102 rotates around the valve rod 102b to open and close the flow path 100a. More specifically, as shown in FIG. 2, in the closed state, the non-opened surface of the hole 102a of the valve body 102 blocks the flow path 100a and blocks the flow path 100a. On the other hand, as shown in FIG. 3, in the open state, the open surface of the hole 102a is directed toward the flow path 100a to open the flow path 100a.

The drive unit 104 has a motor, for example, an electric valve, and gives operating energy to the valve body 102, which is a moving body. In the present embodiment, since the valve body 102, which is a moving body, makes a rotary motion, the drive unit 104 gives the valve body 102 rotational kinetic energy as operating energy. The moving body is not limited to the valve body 102, and may be, for example, a solenoid valve that moves in translation. In this case, the drive unit 104 gives translational kinetic energy as operating energy. Further, the valve may be an air-driven valve. In this case, the drive unit 104 may be composed of, for example, an air actuator, and the translational motion may be converted into a rotary motion by, for example, a ball screw or a rack and pinion.

As shown in FIGS. 2 and 3, the measuring instrument 20 has a first measuring unit 200a and a second measuring unit 200b. The first measuring unit 200a includes an ammeter 202, a voltmeter 204, and a sensor 210. The second measuring unit 200b has a plurality of sensors 206 and 208.

The ammeter 202 measures the current used to drive the drive unit 104. The voltmeter 204 measures the voltage used to drive the drive unit 104.

The sensor 206 is, for example, a pressure (meter) sensor, and measures the pressure in the flow path 100a. The sensor 208 is, for example, a flow rate (total) sensor, and measures the flow rate of the flow path 100a. The sensor 210 is, for example, a temperature (meter) sensor, and measures the temperature of a motor of an electric valve or a cylinder of an air drive valve.

In the present embodiment, at least one of the current measured by the ammeter 202 and the voltage measured by the voltmeter 204 corresponds to the first measured value related to the operating energy for the moving body. Further, the measured value including at least the measured value of the sensor 206 among the measured values of the plurality of sensors 206 and 208 corresponds to the second measured value relating to the pressure in the flow path 100a.

As shown in FIG. 1 again, the indicator 30 outputs a drive signal for rotating the valve stem 102b (FIG. 2) to the drive unit 104. The acquisition unit 50 acquires the first measurement value related to the operating energy to the moving body that changes the flow of the fluid in the flow path 100a (FIG. 2) and the second measurement value related to the pressure of the fluid. That is, the acquisition unit 50 acquires the drive signal output by the indicator 30 and each measured value output by the measuring instrument 20. Then, the acquisition unit 50 outputs the information regarding the drive signal and the information regarding each measured value to the determination unit 60.

Here, the detailed configuration of the determination unit 60 will be described with reference to FIGS. 2 and 4. FIG. 4 is a diagram showing an example of the feature amount used in the determination unit 60. The vertical axis shows the power consumption of the drive unit 104 (FIG. 2) and the pressure in the flow path 100a (FIG. 2), and the horizontal axis shows the time. The shaded squares in FIG. 4 indicate the power consumption of the drive unit 104 (FIG. 2).

The determination unit 60 includes, for example, a CPU (Central Processing Unit). The determination unit 60 constitutes each unit by, for example, executing a program stored in the storage unit 606.

The first calculation unit 602 calculates the first feature amount related to the operating energy for the moving body that changes the flow of the fluid in the flow path 100a (FIG. 2). The moving body is, for example, a valve body 102 arranged in the flow path 100a (FIG. 2).

More specifically, the first calculation unit 602 calculates, as the first feature amount, an amount related to the operating energy of the drive unit 104 (FIG. 2) that drives the valve body 102. For example, when the valve body 102 is an electric valve or a solenoid valve, the first feature amount is either the power consumption amount of the drive unit 104 (FIG. 2) or the maximum value of the power consumption amount. In this case, the first calculation unit 602 calculates the electric energy (FIG. 4) which is the time integration of the value measured by the ammeter 202 and the voltage measured by the voltmeter 204. When the valve body 102 is an air drive valve, the first calculation unit 602 calculates the air flow rate of the drive unit 104 (FIG. 2) as the first feature amount based on the measured value of the sensor 210. Further, in the case of an air-driven valve, the power consumption (energy) may be estimated from the air sound. Further, the first calculation unit 602 may estimate the power consumption (energy) as the first feature amount by using the information of the temperature change based on the measured value of the sensor 210.

The second calculation unit 604 calculates the amount related to the pressure of the fluid in the flow path 100a (FIG. 2) as the second feature amount. For example, the second calculation unit 604 is in a closed state in which the valve body 102 (FIG. 2) stops the fluid in the flow path 100a (FIG. 2) based on the measured value of the sensor 206 (FIG. 2) as the second feature amount. Therefore, the rate of change (FIG. 4) of the pressure in the flow path 100a (FIG. 2) generated after the transition to the open state that allows the fluid to flow in the flow path 100a (FIG. 2) with time is calculated.

Further, the second calculation unit 604 actually enters the flow path 100a (FIG. 2) from the output timing of the drive signal output by the indicator 30 as the third feature amount based on the measured value of the sensor 206 (FIG. 2). The delay time (FIG. 4) until the pressure of is started to fluctuate is calculated. The second calculation unit 604 may calculate the second feature amount and the third feature amount based on the measured value of the sensor 208.

The storage unit 606 includes a storage device such as a memory and a hard disk drive. The storage unit 606 stores the information acquired by the acquisition unit 50, the calculation result of the first calculation unit 602, the calculation result of the second calculation unit 604, and the like in time series.

The statistic calculation unit 608 calculates the statistics of each of the first feature amount, the second feature amount, and the third feature amount by using the information stored in the storage unit 606. For example, the statistic calculation unit 608 calculates the average value and standard deviation of each of the first feature amount, the second feature amount, and the third feature amount.

The setting unit 610 sets the first parameter, the second parameter, and the third parameter corresponding to the first feature amount, the second feature amount, and the third feature amount, respectively. The first parameter, the second parameter, and the third parameter are parameters indicating the range in which the statistics of the first feature amount, the second feature amount, and the third feature amount are statistically distributed. For example, the range in which the statistic is statistically distributed is the range obtained by adding or subtracting the average value calculated by the statistic calculation unit 608 and the value obtained by multiplying the standard deviation by a coefficient, and the parameter is a coefficient.

When the first feature amount is within the predetermined range, the state determination unit 612 determines that the drive unit 104 (FIG. 2) for driving the valve body 102 is normal. The state determination unit 612, for example, multiplies the average value and standard deviation of the first feature amount calculated in advance by the statistic calculation unit 608 by the coefficient which is the first parameter set by the setting unit 610. When the value is within the range obtained by adding or subtracting the coefficient, it is determined that the drive unit 104 (FIG. 2) for driving the valve body 102 is normal. That is, if the power consumption of the drive unit 104 (FIG. 2) is within a predetermined range, it is determined that the drive unit 104 has been driven normally. On the other hand, when the first feature amount is out of the predetermined range, it is determined that an abnormality has occurred in any part of the valve device 10 (FIG. 2). The abnormality according to the present embodiment includes, for example, an abnormality of the valve device 10, and also includes a state in which the flow path 100a (FIG. 2) is clogged, a state in which the flow rate of the fluid is higher than a predetermined value, or a state in which the flow rate is lower than a predetermined value. ..

When the first feature amount is within the predetermined range, the state determination unit 612 determines the state in the flow path 100a (FIG. 2) based on the second feature amount. That is, when the state determination unit 612 determines that the drive unit 104 (FIG. 2) for driving the valve body 102 is normal, the state of the pressure in the flow path 100a (FIG. 2) is determined based on the second feature amount. judge. For example, when the second feature amount is within a predetermined range, it is determined that no abnormality has occurred in the flow path 100a (FIG. 2). On the other hand, when the second feature amount is out of the predetermined range, it is determined that an abnormality has occurred in the flow path 100a (FIG. 2) or an abnormality has occurred in the sensor 206 (FIG. 2).

More specifically, in the state determination unit 612, the second feature amount is the average value and standard deviation of the second feature amount calculated in advance by the statistic calculation unit 608, with the second parameter set by the setting unit 610. It is determined whether or not the value obtained by multiplying a certain coefficient is out of the range obtained by adding or subtracting. If it is within the range, it is determined that no abnormality has occurred in the flow path 100a (FIG. 2). On the other hand, when it is out of the range, it is determined that an abnormality has occurred in the flow path 100a (FIG. 2) or an abnormality has occurred in the sensor 206 (FIG. 2).

Further, the state determination unit 612 determines the state of the sensor 206 (FIG. 2) based on the third feature amount when the first feature amount is within the predetermined range. More specifically, in the state determination unit 612, the third feature amount is the average value and standard deviation of the third feature amount calculated in advance by the statistic calculation unit 608, with the third parameter set by the setting unit 610. It is determined whether or not the value obtained by multiplying a certain coefficient is out of the range obtained by adding or subtracting. If it is within the range, it is determined that no abnormality has occurred in the sensor 206 (FIG. 2). On the other hand, when it is out of the range, it is determined that an abnormality has occurred in the sensor 206 (FIG. 2). Since the amount of fluctuation of the delay time is small when the drive unit 104 (FIG. 2) is normal, an abnormality occurs in the sensor 206 (FIG. 2) when the third feature amount is out of the predetermined range. It is more likely that you are doing it. That is, if the first feature amount is within the predetermined range and the third feature amount is within the predetermined range, the state determination unit 612 determines that no abnormality has occurred in the sensor 206 (FIG. 2). As a result, if the first feature amount is within the predetermined range, the second feature amount is outside the predetermined range, and the third feature amount is within the predetermined range, the state determination unit 612 is connected to the flow path 100a (FIG. It is determined that an abnormality has occurred in 2).

When the first feature amount is out of the predetermined range and the second feature amount and the third feature amount are within the predetermined range, the state determination unit 612 has an abnormality in either the ammeter 202 or the voltmeter 204. Judge that it is highly likely that it has occurred. This is because if the second feature amount and the third feature amount are within the predetermined range, it is statistically considered that the operating energy supplied to the drive unit 104 (FIG. 2) is within the predetermined range.

In this way, the state determination unit 612 determines that any of the valve devices 10 has an abnormality when the first feature amount is out of the predetermined range. In this case, if the second feature amount and the third feature amount are within the predetermined range, it is determined that there is a high possibility that an abnormality has occurred in either the ammeter 202 or the voltmeter 204.

On the other hand, the state determination unit 612 determines that the drive unit 104 (FIG. 2) for driving the valve body 102 is normal when the first feature amount is within the predetermined range. In this case, if the second feature amount is within the predetermined range, it is determined that no abnormality has occurred in the valve device 10. On the other hand, if the second feature amount is out of the predetermined range, it is determined that an abnormality has occurred in the flow path 100a (FIG. 2) or an abnormality has occurred in the sensor 206 (FIG. 2). In this case, if the third feature amount is out of the predetermined range, it is determined that an abnormality has occurred in the sensor 206 (FIG. 2). On the other hand, if the third feature amount is within a predetermined range, it is determined that an abnormality has occurred in the flow path 100a (FIG. 2).

FIG. 5 is an example of a flowchart showing the flow of the determination process in the state determination device 1.
As shown in FIG. 5, the operator sets the first to third parameters by the setting unit 610 (step S100).

Next, the measuring instrument 20 measures data regarding the state of the valve device 10 (step S102). Subsequently, the first calculation unit 602 and the second calculation unit 604 calculate the first to third feature quantities using these data, respectively (step S104).

Next, the state determination unit 612 determines whether or not the first feature amount is within the predetermined range (step S106). When the first feature amount is out of the predetermined range (N in step S106), the state determination unit 612 determines whether or not the second feature amount and the third feature amount are within the predetermined range (step S108). When the second feature amount and the third feature amount are within the predetermined range (YES in step S108), the state determination unit 612 may have an abnormality in either the ammeter 202 or the voltmeter 204. It is determined to be high (step S110). On the other hand, when the second feature amount and the third feature amount are not within the predetermined range (N in step S108), the state determination unit 612 determines that an abnormality has occurred in any of the valve devices 10 (step S108). ).

On the other hand, when the first feature amount is within the predetermined range (YES in step S106), it is determined whether or not the second feature amount is within the predetermined range (step S114). When the second feature amount is within the predetermined range (YES in step S106), the state determination unit 612 determines that the valve device 10 is operating normally (step S116).

On the other hand, when the first feature amount is not within the predetermined range (NO in step S114), it is determined whether or not the third feature amount is within the predetermined range (step S118). When the third feature amount is within the predetermined range (YES in step S118), the state determination unit 612 determines that an abnormality has occurred in the flow path 100a of the valve device 10 (step S116). On the other hand, when the third feature amount is not within the predetermined range (NO in step S118), it is determined that an abnormality has occurred in the sensor 206 (step S122).

As described above, according to the present embodiment, the first calculation unit 602 calculates the first feature amount related to the operating energy to the valve body 102 that changes the flow of the fluid in the flow path, and the second calculation unit. 604 calculates the second feature amount related to the pressure of the fluid, and the state determination unit 612 determines the state in the flow path 100a based on the second feature amount when the first feature amount is within a predetermined range. did. As a result, it is determined that the drive unit 104 is operating normally, and it is possible to determine a state other than the drive unit 104 of the valve device 10.

At least a part of the data processing method in the state determination device 40 according to the present embodiment may be configured by hardware or software. When configured by software, a program that realizes at least a part of the functions of the data processing method may be stored in a recording medium such as a flexible disk or a CD-ROM, read by a computer, and executed. The recording medium is not limited to a removable one such as a magnetic disk or an optical disk, and may be a fixed recording medium such as a hard disk device or a memory. Further, a program that realizes at least a part of the functions of the data processing method may be distributed via a communication line (including wireless communication) such as the Internet. Further, the program may be encrypted, modulated, compressed, and distributed via a wired line or wireless line such as the Internet, or stored in a recording medium.

Although some embodiments have been described above, these embodiments are presented only as examples and are not intended to limit the scope of the invention. The novel devices, methods and programs described herein can be implemented in a variety of other forms. In addition, various omissions, substitutions, and changes can be made to the forms of the apparatus, method, and program described in the present specification without departing from the gist of the invention.

1: Status determination system, 20: Measuring instrument, 40: Status determination device, 100a: Flow path, 102: Ball valve, 104: Drive unit, 602: First calculation unit, 604: Second calculation unit, 606: Storage unit , 608: Statistic calculation unit, 612: State determination unit.

Claims (14)

The first calculation unit that calculates the first feature amount related to the operating energy to the moving body that changes the flow of the fluid in the flow path, and
A second calculation unit that calculates the second feature amount related to the pressure of the fluid, and
When the first feature amount is within a predetermined range, a state determination unit that determines a state in the flow path based on the second feature amount, and a state determination unit.
A state determination device comprising. The moving body is a valve arranged in the flow path, and is a valve.
The first feature amount is an amount related to the operating energy of the drive unit that drives the valve.
The second feature amount is the pressure in the flow path generated after the valve transitions from the closed state in which the fluid is stopped in the flow path to the open state in which the fluid can flow in the flow path. Is a quantity related to the rate of change over time.
When the time change of the pressure, which is the second feature amount, is out of the predetermined range, the state determination unit measures whether an abnormality has occurred in the flow path or measures a measured value of the fluid related to the pressure. The state determination device according to claim 1, wherein it is determined that an abnormality has occurred in the device. Further, an acquisition unit for acquiring the output timing of the drive signal with respect to the drive unit for driving the valve is provided.
The second calculation unit calculates a third feature amount, which is a delay time from the output timing of the drive signal to the start of fluctuation of the pressure of the fluid.
The state determination device according to claim 2, wherein the state determination unit determines that an abnormality has occurred in the flow path of the device having the valve when the third feature amount is within a predetermined range. The third aspect of the present invention, wherein the state determination unit determines that an abnormality has occurred in a measuring instrument for measuring a measured value of the fluid with respect to the pressure when the third feature amount is out of a predetermined range. State judgment device. The state determination device according to claim 4, wherein the state determination unit determines that any of the devices having the valve has an abnormality when the first feature amount is out of the predetermined range. The state determination unit is a measuring instrument that measures a measured value related to the operating energy of the moving body when the first feature amount is out of the predetermined range and the second feature amount is within the predetermined range. The state determination device according to claim 5, wherein it is determined that an abnormality has occurred in the device. A storage unit that stores the first feature amount, the second feature amount, and the third feature amount, and
A setting unit for setting a first parameter, a second parameter, and a third parameter corresponding to the first feature amount, the second feature amount, and the third feature amount, respectively, is further provided.
The state determination unit is based on the first feature amount, the second feature amount, and the first parameter, the second parameter, and the third parameter corresponding to the third feature amount, respectively. The state determination device according to claim 6, wherein it is determined whether or not an abnormality has occurred in the device having a valve. The device is a valve device
A statistic calculation unit for calculating the statistics of the first feature amount, the second feature amount, and the third feature amount stored in the storage unit is further provided.
The first parameter, the second parameter, and the third parameter are parameters indicating a range in which the statistics of the first feature amount, the second feature amount, and the third feature amount are statistically distributed. Yes,
The state determination unit has an abnormality in the valve device based on the first feature amount, the second feature amount, the third feature amount, the first parameter, the second parameter, and the third parameter. The state determination device according to claim 7, wherein the position where the above is generated is determined. When the valve is an electric valve or a solenoid valve, the first feature amount is either the power consumption of the drive unit or the maximum value of the power consumption of the drive unit.
The state determination device according to claim 8, wherein when the valve is an air-driven valve, it is the flow rate of air. The state determination device according to claim 9, wherein the first calculation unit calculates the first feature amount based on either a temperature change of the drive unit or a sound from the drive unit. The state determination device according to claim 10, wherein the second feature amount is a physical quantity including at least the pressure among the pressure, the flow rate, and the temperature of the valve device. The state determination device according to claim 11, wherein the second feature amount is a differential value with respect to the time of the pressure after the output timing. The statistic of each of the first feature amount, the second feature amount, and the third feature amount is an average value and a standard deviation, and the range in which the statistic is statistically distributed is the average value and the said. The state determination device according to claim 12, wherein the range is a range obtained by adding or subtracting a value obtained by multiplying the standard deviation by a coefficient, and the parameter is the coefficient. The first calculation step of calculating the first feature amount related to the operating energy to the moving body that changes the flow of the fluid in the flow path, and
A second calculation step for calculating the second feature amount related to the pressure of the fluid, and
A state determination step of determining a state in the flow path based on the second feature amount when the first feature amount is within a predetermined range, and a state determination step.
A state determination method comprising.

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