JP5386442B2 - Ultrasonic flow meter design and manufacturing support system and method - Google Patents

Description

  The present invention relates to an ultrasonic flowmeter design and manufacturing support system and method.

  In a nuclear power plant, when performing operation to obtain generated power exceeding the rated electrical output under a constant reactor heat output, the heat output target value is the heat output by the reactor heat output monitoring device against the heat output rated value. It is necessary to set a value that allows for a margin corresponding to a calculation error.

  The heat output calculation is a calculation in which the difference between the main steam enthalpy and the feed water enthalpy is multiplied by the feed water flow rate. Therefore, in the reliability of the heat output monitoring, the contribution of the measurement accuracy of the feed water flow rate is greater than the measurement accuracy of the main steam flow rate, the main steam temperature, and the like.

  A conventional feed water flow meter uses a flow nozzle (differential pressure type) flow meter, and since this measurement accuracy is about 2%, safe operation at an output of 100% + 2% = 102% has been confirmed. It was.

  Therefore, if the measurement accuracy of the feed water flow rate can be improved and the expected error in the heat output calculation can be reduced, the heat output target value can be increased from the current 100% to nearly 102% while ensuring safety. This indicates that the output can be improved and the operation efficiency of the plant can be improved only by changing the flow meter without changing the entire plant.

  FIG. 2 shows the concept as a specific example. The graph of FIG. 2 shows the probability distribution of the heat output calculation value when the heat output target value when using the conventional flow nozzle flowmeter is 100%, the horizontal axis is the heat output, and the vertical axis is the probability. is there.

  In the probability distribution 201 when the flow nozzle flowmeter is used, since the heat output calculation accuracy is small, the standard deviation is large and the probability distribution is wide. Therefore, when a probability of 97.7%, for example, is considered as a safety standard, up to 102% of the thermal output is included, so a safety analysis up to 102% of the thermal output is performed.

  On the other hand, for example, if a flow meter with a heat output calculation accuracy of 0.3% is used, the probability distribution is 202, and the heat output is 102% with a probability of 97.7% by applying the same safety standard. If the value is not exceeded, the heat output target value is 101.7%, and an increase of 1.7% is possible.

  There is an ultrasonic flow meter as a flow meter with high flow measurement accuracy. There are various ultrasonic flowmeters such as Doppler type, propagation time difference type, correlation type, etc. Among them, the propagation time difference type flowmeter in which an ultrasonic sensor is inserted directly into the pipe measures the average flow velocity at multiple measurement lines simultaneously. It is known to have high measurement accuracy because it can be performed.

  Regarding the method of increasing the measurement accuracy by using an ultrasonic flow meter instead of the flow nozzle flow meter in the reactor feed water flow meter described above, and increasing the output accordingly to improve the operation efficiency of the plant, for example, This is described in Patent Document 1.

  Here, with reference to FIG. 3, the structure and principle of an eight-line propagation time difference type ultrasonic flowmeter will be described. FIG. 3A shows a cross section of a spool 300 that is a pipe provided with an ultrasonic flowmeter. Sixteen branch pipes (bosses) for inserting ultrasonic sensors (more precisely, a sensor housing in which the ultrasonic sensors are installed) are welded to the spool. Each boss is arranged such that the inserted ultrasonic sensor faces the tube axis direction at an angle of 45 °. For example, the ultrasonic sensor 302b inserted into the boss 302a faces the ultrasonic sensor 303b inserted into the boss 303a. The two ultrasonic sensors facing each other form a survey line, and each of the eight ultrasonic sensors has a direction along the flow (hereinafter referred to as a downstream direction) and a direction opposite to the flow (hereinafter referred to as an upstream direction). The line average flow velocity between the ultrasonic sensors is calculated by measuring the ultrasonic propagation time difference.

  For example, when the water flow direction is from the left to the right as shown in the pipe spool flow velocity distribution 301, the line average flow velocity between the sensors of the ultrasonic sensors 302b and 303b is first determined by the ultrasonic sensor 302b on the upstream side. The downstream propagation time Tdown is measured when transmitted and received by the ultrasonic sensor 303b on the downstream side, and then transmitted in the upstream direction when transmitted by the ultrasonic sensor 303b on the downstream side and received by the ultrasonic sensor 302b on the upstream side. Time Tup is measured. At this time, due to the influence of the flow velocity V in the flow direction, the apparent sound velocity in the ultrasonic propagation path direction is faster in the downstream direction by V ′ = Vsin 45 and slower in the upstream direction. Accordingly, the propagation time difference ΔT is calculated by ΔT = Tup−Tdown, and the linear average flow velocity V between the sensors is obtained from this value, the distance between the sensors, and the speed of sound.

  FIG. 3B shows a cross section of the spool 300 perpendicular to the tube axis direction. As described in FIG. 3A, the ultrasonic sensor 302b and the ultrasonic sensor 303b are paired, and the ultrasonic sensor 304b and the ultrasonic sensor 305b are paired. Further, the ultrasonic sensor 306b and the ultrasonic sensor 307b are paired, and the ultrasonic sensor 308b and the ultrasonic sensor 309b are paired. Further, the ultrasonic sensor 310b and the ultrasonic sensor 311b are paired, and the ultrasonic sensor 312b and the ultrasonic sensor 313b are paired. Further, the ultrasonic sensor 314b and the ultrasonic sensor 315b are paired, and the ultrasonic sensor 316b and the ultrasonic sensor 317b are paired. As described above, the pairs of ultrasonic sensors are arranged so that four parallel pairs and four pairs are orthogonal to each other, and is an eight-track type.

  The average flow rate in the pipe spool is calculated using the line average flow velocity obtained for each of the eight survey lines. For this, Gaussian integration that can be integrated with high accuracy from a finite discrete value is used. In Gaussian integration, the measurement position of the linear average flow velocity is determined in advance, and the measurement values at each position are weighted and integrated. In the 8-track type, Gauss integration is performed on each of the four survey lines 302-303, 306-307, 310-311 and 314-315 and the four survey lines 304-305, 308-309, 312-313 and 316-317. Measurement accuracy is improved by taking the average.

  As described above, since the spool, which is the main structure of the ultrasonic flowmeter, is a high-precision measuring device, it is required to be manufactured with high shape accuracy. In particular, the requirements for the installation position and angular accuracy of eight pairs of bosses are very high, and tolerances are strictly determined.

  On the other hand, since the manufacturing method of a spool is based on welding of many places, manufacturing with high precision requires very much technique and labor. For example, when the boss 302a is installed, the position is fixed so as not to be shifted and then welded to the spool. However, the spool may be deformed or the boss angle may be shifted due to heat input of the weld metal.

  Therefore, in designing and manufacturing the ultrasonic flowmeter spool, a design and manufacturing support system that guarantees the flow rate measurement accuracy and corrects the design tolerances within a possible range of manufacture is required.

  Conventional design and manufacturing support systems include, for example, Patent Literature 1 and Patent Literature 2. Patent Document 1 is a system for storing and displaying tolerance data as design intent and processing target value data as manufacturing know-how as centralized design and manufacturing data that can be shared in design, manufacturing, and inspection, and can be applied to general design manufacturing. Is. Patent Document 2 relates to the design and manufacture of injection molds, and predicts wall thickness fluctuations and sink marks during injection molding by thermal stress strain simulation.

JP 2005-327059 A JP-A-6-55597

“Results of Technical Review and Evaluation on Reactor Power Improvement” Journal of Nuclear Energy Society vol.50 No.12 (2008)

  As described above, it is possible to improve the measurement accuracy by using a highly accurate propagation time difference type ultrasonic flow meter as a feed water flow meter among ultrasonic flow meters, and to improve the operation efficiency of the plant accordingly. Are known. In addition, it has been found that the advantage of using an ultrasonic flowmeter instead of a flow nozzle flowmeter, which causes structural deterioration and pressure loss, is great.

  However, when monitoring reactor heat output, thorough safety checks are required, and when manufacturing such an ultrasonic flow meter, parts that contribute to flow measurement accuracy are manufactured at positions and angles within the required tolerances. It is very important to verify and guarantee that However, in the conventional system, an effective design / manufacturing support method for assuring the flow measurement accuracy of the ultrasonic flowmeter has not been presented.

  The present invention has been made in the background as described above, and provides a design / manufacturing support system and method for an ultrasonic water supply flow meter capable of improving the reliability of flow rate measurement accuracy by the ultrasonic flow meter. It is an object.

  By achieving the present invention as described above, the ultrasonic flowmeter of the present invention is employed in the measurement of the feed water flow value used in the thermal output calculation of the nuclear power plant in the nuclear power plant. It is possible to reduce the expected error and improve the operation efficiency of the plant.

  A system for achieving the object of the present invention includes a spool structure data of a spool of an ultrasonic flowmeter, piping flow path data of a flow path through which a fluid to be measured flows, fluid condition data of the fluid, The actual machine condition storage means for storing fluid temperature condition data, the spool structure data, the water supply pipe flow path data, the fluid condition data, and the temperature condition data are used to measure the flow rate measurement. Coupling analysis means for turbulent flow analysis and structure analysis for calculating the flow velocity distribution in the spool and the displacement of the spool under the conditions of each data, and the analysis result for storing the flow velocity distribution and the displacement data of the spool From the storage means, ultrasonic propagation analysis means for performing ultrasonic propagation analysis of each measurement line of the ultrasonic flowmeter using the analysis result, and from the ultrasonic propagation analysis result of each measurement line, the flow rate A flow measurement accuracy analysis means for calculating measurement accuracy, and a deviation is given to at least one of the spool structure data, the piping flow path data, the fluid condition data, and the temperature condition data, and the ultrasonic propagation analysis and flow rate A design / manufacturing support system for an ultrasonic flowmeter comprising sensitivity analysis means for performing analysis and sensitivity analysis of each parameter, and design / manufacturing support data output means for outputting design / manufacturing support data based on the sensitivity analysis result .

  In addition, the method for achieving the object of the present invention described above includes the spool structure data of the spool of the ultrasonic flowmeter input to the design and manufacturing support system, and the piping flow path data of the flow path through which the fluid to be measured flows. And the fluid condition data of the fluid and the temperature condition data of the fluid are used to calculate the flow velocity distribution in the spool and the displacement of the spool under the conditions of the data at the time of flow measurement. Coupled analysis step of flow analysis / structural analysis, ultrasonic propagation analysis step of performing ultrasonic propagation analysis of each measurement line of the ultrasonic flowmeter using the flow velocity distribution and the displacement data of the spool, A flow measurement accuracy analysis step for calculating flow measurement accuracy from the ultrasonic propagation analysis result of each measurement line, the spool structure data, the pipe flow path data, the fluid condition data, the temperature condition, A sensitivity analysis step for giving a deviation to at least one kind of data, performing the ultrasonic wave propagation analysis and flow rate analysis, and performing sensitivity analysis for each parameter, and design manufacturing for outputting design manufacturing support data based on the sensitivity analysis result An ultrasonic flowmeter design and manufacturing support method including a support data output step.

  The present invention has an effect of improving the reliability of the flow rate measurement accuracy by the ultrasonic flowmeter.

  Therefore, when the ultrasonic flowmeter of the present invention is used for collecting water supply flow rate data when performing, for example, heat output calculation at a nuclear power plant, the expected error is set smaller and the operation efficiency of the nuclear power plant is improved. Can contribute.

It is the schematic for demonstrating the structure of the design manufacturing support system of the ultrasonic flowmeter by the Example of this invention. It is the schematic explaining the method of the output improvement by utilizing the highly accurate ultrasonic flowmeter in a nuclear power plant as an ultrasonic feed water flowmeter. It is the schematic explaining the structure and principle of an 8-line propagation time difference type ultrasonic flowmeter. It is the schematic which shows an example of the design manufacture assistance data display screen of the ultrasonic flowmeter by the Example of this invention. It is a flowchart figure for demonstrating the procedure of the design manufacturing support method of the ultrasonic flowmeter by the Example of this invention. It is a flowchart for demonstrating the procedure in the modification of the design manufacturing support method of the ultrasonic flowmeter by the Example of this invention. It is the schematic for demonstrating the structure in the modification of the design manufacturing support system of the ultrasonic flowmeter by the Example of this invention. It is a flowchart for demonstrating the procedure in the modification of the design manufacturing support method of the ultrasonic flowmeter by the Example of this invention. It is a flowchart for demonstrating the procedure in the modification of the design manufacturing support method of the ultrasonic flowmeter by the Example of this invention.

  Heat output calculation in a nuclear power plant is a calculation that multiplies the difference between main steam enthalpy and feed water enthalpy by feed water flow rate. Therefore, in the reliability of the heat output monitoring by the heat output calculation, the contribution degree of the measurement accuracy of the feed water flow rate is larger than the measurement accuracy of the main steam flow rate, the main steam temperature, etc. in the plant.

  In an embodiment of the present invention, a propagation time difference type ultrasonic flowmeter, which is known to have high measurement accuracy among ultrasonic flowmeters, and has eight measurement lines, is used for the thermal output calculation of a nuclear power plant. It is intended to use as an ultrasonic feed water flow meter for measuring the feed water flow value to be used. Since the explanation of the structure and measurement principle of the eight-line propagation time difference type ultrasonic flowmeter is the same as the contents explained in FIG. 3 in the background column, explanation is omitted in this embodiment to avoid duplication.

  In a typical embodiment of the present invention, in a design and manufacturing support system for an ultrasonic feed water flow meter of a nuclear power plant, spool structure data, feed water pipe flow path data, feed water fluid condition data, and operating temperature Condition storage means for storing condition data, the spool structure data, the water supply pipe flow path data, the fluid condition data, and the temperature condition data are used to calculate the flow velocity distribution in the spool and the spool. Coupled analysis means for turbulent flow analysis / structural analysis for calculating displacement during operation, analysis result storage means for storing the flow velocity distribution and spool displacement data, and using the analysis results, Ultrasonic propagation analysis means for performing acoustic wave propagation analysis, flow measurement accuracy analysis means for calculating flow measurement accuracy from the ultrasonic propagation analysis results of all measurement lines, and the spool structure data and Sensitivity for performing sensitivity analysis of each parameter by giving deviation to the water supply pipe flow path data and / or the fluid condition data and / or the temperature condition data and performing the ultrasonic wave propagation analysis and the flow rate analysis. It is characterized by comprising analysis means and design / manufacturing support data output means for mainly designing / manufacturing support data based on the sensitivity analysis result.

  In the embodiment of the present invention, in the design and manufacturing support system for the ultrasonic feed water flow meter as described above, the data stored by the actual machine condition storage means includes initial drawing tolerance data, and the design and manufacture support data output means. Is characterized in that it outputs the changes to the initial drawing tolerance.

  Furthermore, in the embodiment of the present invention, in the design / manufacturing support system for the ultrasonic water supply flow meter as described above, the spool structure measurement means and the spool structure measurement data storage means for storing the spool structure measurement data obtained as a result thereof. The sensitivity analysis means performs sensitivity analysis using spool structure measurement data during manufacture, and the design / manufacturing support data output device outputs design / manufacturing support data as needed.

  In the embodiment of the present invention, in the design and manufacturing support system for the ultrasonic water supply flow meter as described above, the manufacturing condition input means and the structure analysis means of the manufacturing process are provided, and the sensitivity analysis means Sensitivity analysis is performed using the analysis data, and the design / manufacturing support data output device outputs the revised manufacturing condition as the design / manufacturing support data.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of an ultrasonic flowmeter design and manufacturing support system according to the present invention.

  As shown in FIG. 1, the design / manufacturing support system 100 includes an actual machine condition data storage device 101, an actual machine condition input device 102, a fluid / structure interaction analysis means 103, a fluid / structure analysis data storage device 104, an Sound wave propagation analysis means 105, ultrasonic wave propagation analysis data storage device 106, flow rate measurement accuracy analysis means 107, flow rate analysis data storage device 108, sensitivity analysis means 109, sensitivity analysis data storage device 110, and design and manufacturing support The data output device 111 is configured.

  First, the actual machine condition is input to the actual machine condition data storage device 101 by the actual machine condition input device 102. Here, the actual machine condition input device 102 and the actual machine condition data storage device are, for example, a computer and an accompanying keyboard or electronic storage device. The actual machine condition data includes spool structure data 101a, feed water pipe flow path data 101b, feed water fluid condition data 101c, and temperature condition data 101d.

  Here, the spool structure data and the water supply pipe flow path data are design data of an actual machine described in, for example, three-dimensional CAD. The water supply fluid condition data is condition data such as the pressure, density, temperature, viscosity, and flow rate of actual machine water supply, and the temperature condition data is condition data such as the temperature distribution of the spool portion.

  Using these data, the fluid-structure interaction analysis means 103 performs turbulent flow analysis and structural analysis under the actual machine operating conditions of the nuclear power plant, and the flow velocity distribution analysis data 104a and the spool displacement analysis data 104b are obtained. It is obtained and stored in the fluid / structure analysis data storage device 104.

  Here, the fluid / structure coupled analysis means is, for example, a computer or the like in which a software program or the like in which an algorithm for performing fluid analysis is input by inputting a flow path shape obtained as a result of thermal expansion by structural analysis. The fluid / structure analysis data storage means is, for example, an electronic storage device attached to a computer.

  Next, using the actual machine condition data and the fluid / structure analysis data, the ultrasonic wave propagation analysis means 105 obtains ultrasonic wave propagation analysis data such as the ultrasonic wave propagation time and path in each survey line, and the ultrasonic wave propagation analysis data. It is stored in the storage device 106.

  Here, the ultrasonic wave propagation analyzing means is a computer in which a software program for calculating ultrasonic wave propagation in a fluid using, for example, a ray tracing method is incorporated.

  Next, using the actual machine condition data and the ultrasonic propagation analysis data, the flow rate measurement accuracy analysis means 107 evaluates the error between the actual flow rate and the flow rate calculated by the ultrasonic flow meter, and the analysis result is stored in the flow rate analysis data storage. It is stored in the device 108.

  Here, the flow rate measurement accuracy analysis means includes, for example, a software program that calculates the flow rate from the line average flow velocity of each measurement line obtained as a result of the ultrasonic propagation analysis in the same procedure as the actual ultrasonic flow meter. Computer.

  For the series of flows described above, the sensitivity analysis unit 109 shifts the angle of one boss in the spool structure data 101a, for example, and again measures the flow measurement accuracy from the ultrasonic propagation analysis by the ultrasonic propagation analysis unit 105. The flow measurement accuracy analysis by the analysis means 107 is performed. The sensitivity analysis unit 109 repeats this for each parameter, calculates the sensitivity of the flow measurement accuracy with respect to the deviation of each parameter from the flow measurement accuracy analysis result for each case, and stores it in the sensitivity analysis data storage device 110.

  Here, each parameter is, for example, design data such as the installation position of the sensor and the installation angle of the sensor. The sensitivity analysis means quantitatively evaluates how much the error of the parameter affects the flow measurement accuracy. A computer in which a software program or the like is installed.

  The design / manufacturing support data output device 111 outputs design / manufacturing support data for the spool, boss, and sensor housing. Design manufacturing support data includes manufacturing tolerances of spools, bosses, and sensor housings, sensitivity analysis data of each part, and the like. The manufacturing tolerance is calculated so that the flow rate measurement accuracy is within the target accuracy if all the parts are within the manufacturing tolerance range.

  Here, an example of the sensitivity analysis result when the parameter for giving a deviation in the sensitivity analysis is set to the boss angle will be described with reference to FIG. In the graph on the display screen 400 attached to the computer, a solid line 401 indicates the flow rate measurement accuracy with respect to the angular deviation of one boss. The set value of the flow rate measurement accuracy is indicated by broken lines 402 and 403, and the minimum value and the maximum value of the angle deviation for satisfying the set value are indicated by dotted lines 404 and 405. By displaying this result for each boss, it is possible to indicate a part that requires accuracy in the manufacturing process.

  FIG. 5 is a flowchart in an embodiment of the design and manufacturing support method of the ultrasonic flowmeter of the present invention. First, in step S101, actual machine conditions such as spool structure data, water supply pipe flow path data, water supply fluid condition data, and temperature condition data are input. Next, in step S102, fluid-structure interaction analysis is performed using the actual machine conditions, and flow velocity distribution data and spool displacement data as analysis results are obtained.

  Next, in step S103, ultrasonic propagation analysis data such as ultrasonic propagation time and path in each survey line is obtained using actual machine condition data and fluid / structure analysis data. Next, in step S104, an error between the actual flow rate and the flow rate calculated by the ultrasonic flowmeter is evaluated using the actual machine condition data and the ultrasonic propagation analysis data.

  Next, in step S105, sensitivity analysis is performed. In step S106, parameters such as a part of the spool structure data in the actual machine condition data and the boss angle are changed, and the ultrasonic propagation analysis in step S105 is performed again. If it is determined in step S105 that sensitivity analysis has been completed, design and manufacturing support data is output in step S107.

  As described above, the design / manufacturing support system 100 includes the actual machine condition data storage device 101, the actual machine condition input device 102, the fluid / structure coupled analysis means 103, the fluid / structure analysis data storage device 104, and the ultrasonic wave propagation analysis. Means 105, ultrasonic propagation analysis data storage device 106, flow rate measurement accuracy analysis means 107, flow rate analysis data storage device 108, sensitivity analysis means 109, sensitivity analysis data storage device 110, and design / manufacturing support data output device 111.

  The process up to the output of support data is as follows. That is, the actual machine condition is input to the actual machine condition data storage device 101 by the actual machine condition input device 102. Using this data, the fluid / structure coupled analysis means 103 performs turbulent flow analysis and structural analysis under actual machine operating conditions to obtain flow velocity distribution analysis data 104a and spool displacement analysis data 104b. It is stored in the data storage device 104.

  Next, using the actual machine condition data and the fluid / structure analysis data, the ultrasonic wave propagation analysis means 105 obtains ultrasonic wave propagation analysis data such as the ultrasonic wave propagation time and path in each survey line, and the ultrasonic wave propagation analysis data. It is stored in the storage device 106.

  Next, using the actual machine condition data and the ultrasonic propagation analysis data, the flow rate measurement accuracy analysis means 107 evaluates the error between the actual flow rate and the flow rate calculated by the ultrasonic flow meter, and the analysis result is stored in the flow rate analysis data storage. It is stored in the device 108.

  Next, the sensitivity analysis unit 109 changes one parameter, and again performs flow measurement accuracy analysis by the flow measurement accuracy analysis unit 107 from ultrasonic propagation analysis by the ultrasonic propagation analysis unit 105. The sensitivity analysis unit 109 repeats this for each parameter, calculates the sensitivity of the flow measurement accuracy with respect to the deviation of each parameter from the flow measurement accuracy analysis result for each case, and stores it in the sensitivity analysis data storage device 110. Finally, the design / manufacturing support data output device 111 outputs information on the relationship between the change of each parameter and the sensitivity as design / manufacturing support data.

  FIG. 6 is a flowchart for explaining a procedure in a modified example of the design and manufacturing support method of the ultrasonic flowmeter of the present invention.

  In FIG. 6, the approximate procedure is the same as the procedure shown in FIG. 5, so the description thereof is omitted, and only the parts different from FIG. 5 are described. First, in step S201, an initial drawing tolerance is input. Here, the drawing tolerance is, for example, a design intersection such as a sensor installation position or a sensor installation angle. Based on this drawing tolerance, sensitivity analysis is performed in S202 to S206 as in FIG.

  In step S207, the target accuracy of the flowmeter is compared and examined. If it is determined whether the drawing tolerance is to be stricter or looser than the initial drawing tolerance, the tolerance is reset and the sensitivity is evaluated again. If it is determined in step S207 that resetting of the drawing tolerance is not necessary, the drawing tolerance is output in step S209 and the process is terminated. With this method, it is possible to save time and labor for exhaustive sensitivity analysis, and to reset the drawing tolerance to an appropriate value in a short period of time.

  FIG. 7 is a schematic diagram for explaining a configuration in a modification of the design and manufacturing support system for the ultrasonic flowmeter of the present invention.

  In FIG. 7, since the approximate configuration is the same as the configuration shown in FIG. 1, the description thereof will be omitted, and only the portions different from FIG. 1 will be described. In addition to the system 100 of FIG. 1, the ultrasonic flowmeter design / manufacturing support system 500 of FIG. 7 includes a storage device 501 for spool structure measurement data obtained by a spool structure measuring means 502 for measuring the spool structure being manufactured. Prepare.

  Here, the spool structure measuring means includes, for example, a jig having a spool central axis as an x-axis and a straight line perpendicular to all measurement lines as a z-axis, and the sensor installation position and sensor installation with respect to a reference by the jig. A three-dimensional measuring device or the like that measures an angle or the like.

  By using this measurement data for the sensitivity analysis means 503, a manufacturing tolerance required for a part to be manufactured is calculated, stored in the sensitivity analysis data storage device 504, and output by the design / manufacturing support data output device 505. Thus, for example, the position and angle are measured at the stage where the boss 302a is welded, and the welding position / angle and accuracy required for the boss 303a are reset by the manufacturing error obtained as a result. It can be manufactured to meet the target accuracy of the meter. Moreover, when it turns out that it does not satisfy the target accuracy, it can be remanufactured by omitting subsequent useless processes.

  FIG. 8 is a flowchart for explaining a procedure in a modification of the method for supporting the design and manufacture of an ultrasonic flowmeter according to the present invention.

  In FIG. 8, since the approximate procedure is the same as the procedure shown in FIG. 5, the description thereof will be omitted, and only the parts different from FIG. 5 will be described. In step S305, the structure of the spool being manufactured is measured. Next, in step S306, sensitivity analysis is performed based on the measurement result of the manufactured part. From this result, it is confirmed in step S307 whether or not the flow measurement accuracy can be within the target accuracy. If not, in step S308, the tolerance of the unmanufactured part is reset so as to be within the target accuracy. The The process is repeated until the manufacture of the spool is completed, and the process ends when the completion of the spool manufacture is confirmed in step S309.

  FIG. 9 is a flowchart for explaining a procedure in a modification of the design and manufacturing support method for the ultrasonic flowmeter of the present invention.

  In FIG. 9, the approximate procedure is the same as the procedure shown in FIG. 5, so the description thereof will be omitted, and only the parts different from FIG. 5 will be described. In step S405, the manufacturing condition input means such as a keyboard attached to the computer that calibrates the design manufacturing support system 100 is used with the conditions for manufacturing an ultrasonic flowmeter such as a spool as the manufacturing conditions in the design manufacturing support system 100. In addition, instead of a keyboard, means for inputting a desk storing the manufacturing conditions into a computer may be used. The manufacturing conditions referred to here are, for example, the temperature and mass of the weld metal, the welding method, and the like.

  Next, in step S406, the deformation when manufactured based on the manufacturing conditions is obtained by structural analysis. Next, in step S407, sensitivity analysis is performed using the structural analysis result of the manufacturing process, and in step S408, it is confirmed whether the target accuracy of the flowmeter is satisfied. If not, in step S409, the manufacturing conditions are changed, and the structural analysis of the manufacturing process is performed again. If the target accuracy of the flowmeter is met, a drawing tolerance is output and the process ends. As a result, it is possible to estimate in advance the deformation that becomes a problem in the manufacturing process, shorten the preliminary process by a mock-up test or the like, and set suitable manufacturing conditions.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a system that provides design / manufacturing support data for an ultrasonic flowmeter that is installed in a piping of a water supply system to a reactor pressure vessel of a nuclear power plant and measures a water supply flow rate.

101 Actual machine condition data storage device 102 Actual machine condition input device 103 Fluid / structure coupled analysis means 104 Fluid / structure analysis data storage apparatus 105 Ultrasonic propagation analysis means 106 Ultrasonic propagation analysis data storage apparatus 107 Flow measurement accuracy analysis means 108 Flow analysis Data storage device 109 Sensitivity analysis means 110 Sensitivity analysis data storage device 111 Design and manufacturing support data output device 201 Thermal output calculation probability distribution 202 when using flow nozzle flow meter 202 Thermal output calculation probability distribution when using ultrasonic flow meter 300 Spool 301 Piping Spool flow velocity distribution 302a to 317a Boss 302b to 317b Ultrasonic sensor 400 Display screen S101 Actual machine condition input step S102 Fluid-structure interaction analysis step S103 Ultrasonic propagation analysis step S104 Flow rate measurement accuracy analysis step S105 Sensitivity analysis step S107 design and manufacturing support data output step

Claims (8)

  Spool structure data of a spool of an ultrasonic flow meter, piping flow path data of a flow path through which a fluid to be measured flows, fluid condition data of the fluid, and actual condition storage means for storing temperature condition data of the fluid The flow velocity distribution in the spool under the conditions of the data at the time of flow measurement using the spool structure data, the water supply pipe flow path data, the fluid condition data, and the temperature condition data And coupled analysis means for turbulent flow analysis / structural analysis for calculating the displacement of the spool, analysis result storage means for storing the flow velocity distribution and spool displacement data, and using the analysis result, Ultrasonic propagation analysis means for performing ultrasonic propagation analysis of each measurement line of the acoustic flowmeter, flow measurement accuracy analysis means for calculating flow measurement accuracy from the ultrasonic propagation analysis result of each measurement line, and Sensitivity analysis in which at least one of the pool structure data, the piping flow path data, the fluid condition data, and the temperature condition data is given a deviation, and the ultrasonic wave propagation analysis and flow rate analysis are performed, and sensitivity analysis of each parameter is performed. And a design / manufacturing support data output unit for outputting design / manufacturing support data based on the sensitivity analysis result.   2. The data stored in the actual machine condition storage means includes drawing tolerance data representing a tolerance on the drawing of the ultrasonic flowmeter, and the design / manufacturing support data output means outputs a changed portion with respect to the tolerance. Design and manufacturing support system for ultrasonic flowmeters.   2. The spool structure measuring means for measuring a spool structure in the course of manufacturing the spool, spool structure measurement data storing means for storing spool structure measurement data obtained as a result, and the spool structure data as the spool structure. A design / manufacturing support system for an ultrasonic flowmeter, comprising: data updating means for updating with measurement data; and a design / manufacturing support data output device for outputting design / manufacturing support data during manufacture.   2. The manufacturing apparatus according to claim 1, further comprising a manufacturing condition input means for inputting manufacturing conditions of the ultrasonic flowmeter to the design manufacturing support system, and a structure analysis means for the manufacturing process. A design manufacturing support system for an ultrasonic flowmeter, wherein the design manufacturing support data output device outputs a revised manufacturing condition as design manufacturing support data.   Spool structure data of the spool of the ultrasonic flowmeter input to the design and manufacturing support system, piping flow path data of the flow path through which the fluid to be measured flows, fluid condition data of the fluid, and temperature condition data of the fluid , A coupled analysis step of turbulent flow analysis / structural analysis for calculating the flow velocity distribution in the spool and the displacement of the spool under the conditions of the respective data at the time of flow measurement, the flow velocity distribution and Using the data of the displacement of the spool, the ultrasonic wave propagation analysis step for performing ultrasonic wave propagation analysis of each measurement line of the ultrasonic flowmeter, and the flow rate measurement accuracy from the ultrasonic wave propagation analysis result of each measurement line. A flow measurement accuracy analysis step to be calculated, and giving a deviation to at least one of the spool structure data, the piping flow path data, the fluid condition data, and the temperature condition data; An ultrasonic flowmeter comprising: a sensitivity analysis step for performing sensitivity analysis of each parameter by performing ultrasonic propagation analysis and flow rate analysis; and a design manufacturing support data output step for outputting design manufacturing support data based on the sensitivity analysis result Design manufacturing support method.   6. The method according to claim 5, further comprising a step of inputting drawing tolerance data representing a tolerance on the drawing of the ultrasonic flowmeter to the design and manufacturing support system, wherein the design and manufacturing support data output step outputs a changed portion with respect to the drawing tolerance data. A design and manufacturing support method for an ultrasonic flowmeter, characterized in that:   6. The design manufacturing support according to claim 5, further comprising a spool structure measurement step for measuring a structure in the course of manufacturing the spool, wherein the sensitivity analysis step performs sensitivity analysis using spool structure measurement data acquired by the measurement. The data output step outputs design / manufacturing support data at any time, and a design / manufacturing support method for an ultrasonic flowmeter.   6. The method according to claim 5, further comprising: a manufacturing condition input step for inputting manufacturing conditions of the ultrasonic flowmeter to the design manufacturing support system; and a manufacturing process structure analysis step for analyzing a structure of a manufacturing process of the ultrasonic flowmeter. In the analysis step, sensitivity analysis is performed using analysis data of deformation generated at the time of manufacturing the ultrasonic flowmeter, and the design manufacturing support data output step outputs revised manufacturing conditions as design manufacturing support data. Design and manufacturing support method for ultrasonic flowmeters.

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