WO2019107875A1 - 수치해석을 이용한 선박의 대수속도 계측장치의 교정방법 - Google Patents
수치해석을 이용한 선박의 대수속도 계측장치의 교정방법 Download PDFInfo
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- WO2019107875A1 WO2019107875A1 PCT/KR2018/014715 KR2018014715W WO2019107875A1 WO 2019107875 A1 WO2019107875 A1 WO 2019107875A1 KR 2018014715 W KR2018014715 W KR 2018014715W WO 2019107875 A1 WO2019107875 A1 WO 2019107875A1
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- Prior art keywords
- ship
- logarithmic
- velocity
- flow
- flow field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/003—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring fluid level in front of an obstacle
Definitions
- the present invention relates to a calibration method for a logarithmic velocity measuring apparatus using a numerical analysis, and more particularly, to a calibration method for a logarithmic velocity measuring apparatus considering the effect of a bird.
- a ship In general, a ship is buoyant and floating on the sea, and it is navigated at a constant speed using a propelling means such as a propeller. At this time, the ground speed of the ship means the speed at which the ship moves relative to the ground surface.
- the logarithmic velocity is the velocity at which the ship passes water,
- the speed of the ship is slower than the speed of the ground.
- the speed of the ship is faster than the speed of the ground.
- the energy regulatory policy for reducing carbon dioxide emissions is the EEDI Index, a measure of the carbon dioxide emitted by ships carrying one mile of water (1.852 km) The number of vessels and the number of vessels that can be transported to the vessel, the number of vessels to be transported, the number of vessels to be transported, and so on). In order to reduce greenhouse gas emissions during ship operations, Efforts are underway to more accurately assess performance.
- the ship's speed performance at the time of contract with the ship owner means the performance in waves, wind and water without algae.
- the effect of the increase of ship resistance is reflected according to the rule established.
- the effect of algae is reflected by the average of round trip measurement.
- the conventional correction method is generally performed by using the result of the speed commissioning measured by DGPS (Differential Global Positioning System). This method is fundamentally inaccurate on the calibration methodology because it is not based on the actual known flow rate, based on the complete calibration of the algae effect on the vessel's speed commissioning results.
- DGPS Different Global Positioning System
- the logarithmic velocity measuring device generally measures tens to hundreds of meters The measured value at this position is different from the actual logarithmic velocity value and the difference is measured by the logarithmic velocity measuring device There is a need to calibrate through calibration.
- the present invention proposes a method of calibrating a logarithmic velocity measuring apparatus based on calculation of a flow field around a hull using a numerical analysis method, .
- the calibration method of a logarithmic velocity measuring apparatus using a numerical analysis is a method for calibrating a logarithmic velocity measuring apparatus using a logarithmic velocity measurement position from a flow field analysis step and a flow field analysis step for a ship according to a ship operating condition, And a calibration value calculation step of calculating a logarithmic velocity correction value using the flow velocity ratio.
- the present invention is characterized by including a calibration value calculating step of calculating a logarithmic velocity correction value using a numerical analysis, wherein the ship operating condition is at least one of the draft, the linear velocity and the water temperature of the ship.
- the flow field analysis step performs the flow field analysis on the ship to which the logarithmic speedometer is attached under the condition of the ship draft, the linear velocity, and the water temperature, and the calibration value calculation step And a control unit.
- the flow velocity ratio calculation step is characterized by calculating the flow velocity ratio at the logarithmic velocity measurement position using the measurement position to which the logarithmic speedometer is attached from the flow field analysis step.
- the calibration value calculation step is characterized by calculating the logarithmic velocity correction value by dividing the measured logarithmic velocity value measured from the logarithmic velocity meter by the flow velocity ratio.
- the calibration device for a ship's logarithmic velocity measuring device using numerical analysis is characterized in that a flow velocity analysis module and a flow field analysis module for a ship according to a ship operating condition are used to measure a flow velocity at a logarithmic velocity measurement position And a calibration value calculation module for calculating a logarithmic velocity correction value using the flow velocity ratio.
- the calibration method of the ship's logarithmic velocity measuring apparatus using the numerical analysis according to the present invention is a method of calibrating the ship's water- It is possible to compensate the slowing speed relative to the logarithmic speed actually measured by the flow disturbance at the distant position, and it is possible to perform accurate logarithmic velocity measurement, and the performance of the ship can be accurately measured.
- Figs. 1A and 1B are conceptual diagrams of logarithmic velocity.
- Fig. 2 shows an example of a flow field analysis chart on the bottom of the bottom.
- FIG. 3 is a block diagram of a method for calculating a logarithmic velocity correction value according to the present invention.
- FIG. 4 is a flowchart of a calibration method of a logarithmic velocity measuring apparatus using a numerical analysis according to the present invention.
- FIG. 5 is a schematic view of a calibration apparatus for a ship's logarithmic velocity measuring apparatus using numerical analysis according to the present invention.
- Figs. 1A and 1B are conceptual diagrams of logarithmic velocity.
- the ground speed is a speed at which the ship moves relative to the ground surface, and the ground speed is measured using the DGPS.
- the alga speed corresponds to the difference between the algebraic speed and the ground speed, From the bottom of the ship tens of centimeters to tens of meters It can be measured from the logarithmic speedometer at a remote position.
- the measurement value measured from the logarithmic speedometer at this time has a lower value than the actual value due to the disturbance of the flow field generated at the bottom of the ship.
- Fig. 2 shows an example of a flow field analysis chart on the bottom of the bottom.
- the influence of the disturbance due to the hull due to the hull is included unlike the actual effect.
- the velocity ratio which is the ratio between the linear velocity (U 0 ) at the measurement position (x, y, z) of the logarithmic velocity meter and the actual velocity reduced by the flow field disturbance caused by the hull, which is to be reflected in the logarithmic velocity correction value.
- the bottom flow field is analyzed and the flow velocity ratio u (x, y, z) between the line speed U 0 and the actual flow velocity u (x, y, z) x, y, z) / U0) can be calculated from the flow field analysis plot.
- the calculated flow velocity ratio u (x, y, z) / U0 is calculated by multiplying the measured velocity value u measured in the logarithmic velocity meter by the flow velocity ratio u (x, y, z) / U0), the logarithmic velocity correction value (u calibrated ) is calculated, and the use of this value makes it possible to judge the influence of the algae more precisely.
- FIG. 4 is a flowchart of a calibration method of a ship's logarithmic speed measuring device using numerical analysis according to the present invention
- FIG. 5 is a schematic diagram of a calibration device for a ship's logarithmic velocity measuring device using a numerical analysis according to the present invention.
- the calibration method of a logarithmic velocity measuring apparatus using a numerical analysis is a method of calibrating a ship by calculating the at least one of ship draft,
- a calibration value calculation step (S300) of calculating the logarithmic velocity correction value using the calculated flow velocity ratio u (x, y, z) / U0 is performed to obtain a calibration value accurately reflecting the influence of the bird .
- the calibration value calculation step S300 calculates the logarithmic velocity measurement value u measured measured by the logarithmic velocity meter attached to the bottom of the vessel as the velocity ratio u (x, y, z) / U0 ), And the logarithmic velocity correction value (u calibrated ) is calculated.
- the calibration apparatus 100 for a ship's logarithmic velocity measuring apparatus using numerical analysis includes a flow field analysis module 10, a flow field analysis module (hereinafter, referred to as " 10) using the logarithmic velocity measurement position to calculate the velocity ratio at the logarithmic velocity measurement position, and a calibration value calculation module (30) for calculating the logarithmic velocity correction value using the velocity ratio .
- a calibration method for a ship's logarithmic velocity measuring apparatus using a numerical analysis is capable of correcting a slowing-down rate relative to a logarithmic velocity actually measured by a flow disturbance at a position of several tens of meters to several tens meters from the bottom, And the measurement of the performance of the ship can be performed precisely. Therefore, it can be more effectively used in the field of measuring the speed of the ship.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Volume Flow (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
Claims (6)
- 선박운항조건에 따른 선박에 대한 유동장 해석단계;상기 유동장 해석단계로부터 대수속도 측정위치를 이용하여 대수속도 측정위치에서의 유속비를 산출하는 유속비 산출단계; 및상기 유속비를 이용하여 대수속도 교정값을 산출하는 교정값 산출단계를 포함하는 것을 특징으로 하는 수치해석을 이용한 선박의 대수속도 계측장치의 교정방법.
- 제1항에 있어서,상기 선박운항조건은 선박의 흘수, 선속,수온 중 어느하나 이상인 것을 특징으로 하는 수치해석을 이용한 선박의 대수속도 계측장치의 교정방법.
- 제2항에 있어서,상기 유동장 해석단계는 상기 선박의 흘수, 상기 선속, 상기 수온의 조건으로, 대수속도계가 부착되는 선박에 대해서 유동장 해석을 수행하는 것을 특징으로 하는 수치해석을 이용한 선박의 대수속도 계측장치의 교정방법.
- 제3항에 있어서,상기 유속비 산출단계는 상기 유동장 해석단계로부터 상기 대수속도계가 부착된 측정위치를 이용하여, 대수속도 측정위치에서의 유속비를 산출하는 것을 특징으로 선박의 대수속도 계측장치의 교정방법.
- 제4항에 있어서,상기 교정값 산출단계는 상기 대수속도계로부터 측정된 대수속도 측정값을 상기 유속비로 나누어 대수속도 교정값을 산출하는 것을 특징으로 하는 선박의 대수속도 계측장치의 교정방법.
- 선박운항조건에 따른 선박에 대한 유동장 해석모듈;상기 유동장 해석모듈로부터 대수속도 측정위치를 이용하여 대수속도 측정위치에서의 유속비를 산출하는 유속비 산출모듈; 및상기 유속비를 이용하여 대수속도 교정값을 산출하는 교정값 산출모듈을 포함하는 것을 특징으로 하는 수치해석을 이용한 선박의 대수속도 계측장치용 교정장치.
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JP2020528120A JP2021504692A (ja) | 2017-11-29 | 2018-11-27 | 数値解析を用いた船舶の対水速度計測装置の校正方法 |
CN201880076082.4A CN111386467A (zh) | 2017-11-29 | 2018-11-27 | 利用数值分析的船舶对水速度测量装置校准方法 |
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KR102034613B1 (ko) | 2019-05-29 | 2019-11-08 | 한국해양과학기술원 | 예인수조 모형시험 시 정상파 영향의 보정방법, 정상파 영향을 최소화한 예인시점 산출방법 및 예인수조 모형시험 시 정상파 영향의 보정장치 |
KR102351023B1 (ko) * | 2019-12-26 | 2022-01-13 | 한국해양과학기술원 | 수치해석을 이용한 선박풍속 교정 장치 및 방법 |
CN115031764B (zh) * | 2022-06-01 | 2023-10-31 | 中国船舶重工集团公司第七0七研究所九江分部 | 一种用于计程仪的快速标定方法 |
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JP6046308B1 (ja) * | 2015-09-16 | 2016-12-14 | 日本郵船株式会社 | 船速計および船速取得方法 |
WO2017154129A1 (ja) * | 2016-03-09 | 2017-09-14 | 日本郵船株式会社 | 対水船速計および対水船速計の計測値補正方法 |
CN106290987B (zh) * | 2016-08-04 | 2020-02-07 | 中国船舶重工集团公司第七一九研究所 | 一种多普勒计程仪对水测速精度考核的方法 |
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CN107179420A (zh) * | 2017-07-13 | 2017-09-19 | 赵辰 | 一种采用定向超声波测量船舶对水速度和方向的方法 |
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KR20080071269A (ko) * | 2007-01-30 | 2008-08-04 | 현대중공업 주식회사 | 선박의 속력 시운전 최적코스 선정 방법 |
KR20120063958A (ko) * | 2010-12-08 | 2012-06-18 | 현대중공업 주식회사 | 시운전 선박의 최적 경로 판단을 위한 항해정보 측정시스템 |
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JP2017087945A (ja) * | 2015-11-09 | 2017-05-25 | キヤノン株式会社 | 船舶監視装置 |
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