Coriolis flowmeter, timing prediction system, and timing prediction method
First Claim
1. A Coriolis flowmeter comprising:
- a Coriolis sensor unit configured to detect a vibration of a vibration tube to output a first output signal;
a current amplifier configured to supply a drive current for vibrating the vibration tube to the Coriolis sensor unit;
an amplifier configured to amplify the first output signal output from the Coriolis sensor unit to output a second output signal;
a smoother configured to smooth the second output signal output from the amplifier to output a third output signal;
a control amplifier configured to amplify a difference between the third output signal output from the smoother and a target voltage to output a fourth output signal;
a voltage setter configured to output a fixed gain setting voltage;
a switch configured to select either the fourth output signal or the fixed gain setting voltage;
a multiplier configured to multiply the second output signal output from the amplifier by the fourth signal or the fixed gain setting voltage selected by the switch to output a fifth output signal to the current amplifier; and
a hardware processor configured to control the voltage setter and the switch,wherein the current amplifier is configured to amplify the fifth output signal output from the multiplier to generate the drive current,wherein the hardware processor is configured to;
obtain a growth ratio of an integral value of a square value of an output value from the Coriolis sensor unit when the switch is caused to select a first gain;
obtain an attenuation ratio of the integral value of the square value of the output value from the Coriolis sensor unit when the switch is caused to select a second gain which is smaller than the first gain;
calculate a first parameter indicating at least one of a spring constant of the vibration tube and a damping coefficient of the vibration tube on the basis of the growth ratio, the attenuation ratio, the first gain, and the second gain; and
predict a time required for a state of the vibration tube to become a state requiring maintenance, using the first parameter or a second parameter obtained by performing a predetermined calculation on the first parameter.
1 Assignment
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Accused Products
Abstract
A Coriolis flowmeter includes a change ratio obtainer configured to obtain a change ratio of vibration of a vibration tube when the vibration tube is vibrated with a constant driving force by causing a switch to select a fixed gain setting voltage, a calculator configured to calculate a first parameter indicating at least one of a spring constant of the vibration tube and a damping coefficient of the vibration tube on the basis of the change ratio obtained by the change ratio obtainer and the constant driving force, and a predictor configured to predict at least one of a time, an operating time, and an integrated flow rate of a fluid flowing in the vibration tube required for a state of the vibration tube to become a state requiring maintenance, using the first parameter calculated by the calculator or a second parameter obtained by performing a predetermined calculation on the first parameter.
5 Citations
20 Claims
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1. A Coriolis flowmeter comprising:
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a Coriolis sensor unit configured to detect a vibration of a vibration tube to output a first output signal; a current amplifier configured to supply a drive current for vibrating the vibration tube to the Coriolis sensor unit; an amplifier configured to amplify the first output signal output from the Coriolis sensor unit to output a second output signal; a smoother configured to smooth the second output signal output from the amplifier to output a third output signal; a control amplifier configured to amplify a difference between the third output signal output from the smoother and a target voltage to output a fourth output signal; a voltage setter configured to output a fixed gain setting voltage; a switch configured to select either the fourth output signal or the fixed gain setting voltage; a multiplier configured to multiply the second output signal output from the amplifier by the fourth signal or the fixed gain setting voltage selected by the switch to output a fifth output signal to the current amplifier; and a hardware processor configured to control the voltage setter and the switch, wherein the current amplifier is configured to amplify the fifth output signal output from the multiplier to generate the drive current, wherein the hardware processor is configured to; obtain a growth ratio of an integral value of a square value of an output value from the Coriolis sensor unit when the switch is caused to select a first gain; obtain an attenuation ratio of the integral value of the square value of the output value from the Coriolis sensor unit when the switch is caused to select a second gain which is smaller than the first gain; calculate a first parameter indicating at least one of a spring constant of the vibration tube and a damping coefficient of the vibration tube on the basis of the growth ratio, the attenuation ratio, the first gain, and the second gain; and predict a time required for a state of the vibration tube to become a state requiring maintenance, using the first parameter or a second parameter obtained by performing a predetermined calculation on the first parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A timing prediction system comprising:
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a Coriolis flowmeter; and a calculation device connected to the Coriolis flowmeter, wherein the Coriolis flowmeter comprises; a Coriolis sensor unit configured to detect a vibration of a vibration tube to output a first output signal; a current amplifier configured to supply a drive current for vibrating the vibration tube to the Coriolis sensor unit; an amplifier configured to amplify the first output signal output from the Coriolis sensor unit to output a second output signal; a smoother configured to smooth the second output signal output from the amplifier to output a third output signal; a control amplifier configured to amplify a difference between the third output signal output from the smoother and a target voltage to output a fourth output signal; a voltage setter configured to output a fixed gain setting voltage; a switch configured to select either the fourth output signal or the fixed gain setting voltage; a multiplier configured to multiply the second output signal output from the amplifier by the fourth signal or the fixed gain setting voltage selected by the switch to output a fifth output signal to the current amplifier; and a first hardware processor configured to control the voltage setter and the switch, wherein the current amplifier is configured to amplify the fifth output signal output from the multiplier to generate the drive current, wherein the first hardware processor is configured to; obtain a growth ratio of an integral value of a square value of an output value from the Coriolis sensor unit when the switch is caused to select a first gain; obtain an attenuation ratio of the integral value of the square value of the output value from the Coriolis sensor unit when the switch is caused to select a second gain which is smaller than the first gain; and calculate a first parameter indicating at least one of a spring constant of the vibration tube and a damping coefficient of the vibration tube on the basis of the growth ratio, the attenuation ratio, the first gain, and the second gain, wherein the calculation device comprises a second hardware processor configured to; predict a time required for a state of the vibration tube to become a state requiring maintenance, using the first parameter or a second parameter obtained by performing a predetermined calculation on the first parameter. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A timing prediction method using a Coriolis flowmeter which comprises a Coriolis sensor unit, a current amplifier, an amplifier, a smoother, a control amplifier, a voltage setter, a switch, a multiplier, and a hardware processor, the timing prediction method comprising:
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detecting, by the Coriolis sensor unit, a vibration of a vibration tube to output a first output signal; supplying, by the current amplifier, a drive current for vibrating the vibration tube to the Coriolis sensor unit; amplifying, by the amplifier, the first output signal output from the Coriolis sensor unit to output a second output signal; smoothing, by the smoother, the second output signal output from the amplifier to output a third output signal; amplifying, by the control amplifier, a difference between the third output signal output from the smoother and a target voltage to output a fourth output signal; outputting a fixed gain setting voltage by the voltage setter; selecting, by the switch, either the fourth output signal or the fixed gain setting voltage; multiplying, by the multiplier, the second output signal output from the amplifier by the fourth signal or the fixed gain setting voltage selected by the switch to output a fifth output signal to the current amplifier; controlling the voltage setter and the switch by the hardware processor; amplifying, by the current amplifier, the fifth output signal output from the multiplier to generate the drive current; obtaining, by the hardware processor, a growth ratio of an integral value of a square value of an output value from the Coriolis sensor unit when the switch is caused to select a gain; obtaining, by the hardware processor, an attenuation ratio of the integral value of the square value of the output value from the Coriolis sensor unit when the switch is caused to select a second gain which is smaller than the first gain; calculating, by the hardware processor, a first parameter indicating at least one of a spring constant of the vibration tube and a damping coefficient of the vibration tube on the basis of the growth ratio, the attenuation ratio, the first gain, and the second gain; and predicting, by the hardware processor, a time required for a state of the vibration tube to become a state requiring maintenance, using the first parameter or a second parameter obtained by performing a predetermined calculation on the first parameter.
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Specification