• 센서학회지
• /
• 제26권1호
• /
• pp.66-72
• /
• 2017

The three dimensional ultrasonic anemometer was constructed to reduce the disadvantages of the two-dimensional anemometer and to be free from the use environment. Three pairs of transmitting and receiving ultrasonic sensors were designed to face each other at an angle of $45^{\circ}$ to the upper and lower surfaces at intervals of $120^{\circ}$. 200 kHz ultrasonic sensor Oscillation, transmission and reception, level detection, power supply circuit were designed and U, V, W wind speed vector components were obtained by measuring the time of first received ultrasonic pulse by transmitting pulse ultrasound. It is implemented as firmware in ARM Coretex-M3 processor so that horizontal and vertical wind direction and wind speed can be converted into digital signal by vector calculation. In this study, The three-dimensional ultrasonic anemometer can complement the disadvantages of the two-dimensional anemometer (mechanical and ultrasonic), and it is expected to gradually replace the two-dimensional anemometer due to its high utilization rate by collecting additional information such as vertical wind.

• 풍력에너지저널
• /
• 제9권4호
• /
• pp.9-15
• /
• 2018

In a previous study, a technique for measuring wind speed and direction by using a roll-rotating three-axis ultrasonic anemometer was proposed and verified by wind tunnel tests. In the tests, instead of a roll sensor, roll angle was trimmed to make no up flow in the transformed wind speeds. Verification was done in point of the residual error of the rotation effect treatment. In this study, roll angle was measured from the roll motor encoder and the transformed wind speed and direction on the test section axis were compared with the ones provided to the test section. As a result, up to yaw $20^{\circ}$ at a wind speed of 12 m/sec or over, the RMS error of wind speed was within the double of the ultrasonic anemometer error. But at yaw $30^{\circ}$, it was over the double of the ultrasonic anemometer error. Regardless of wind speed, at yaw $20^{\circ}$ and $30^{\circ}$, the direction error was within the double of the ultrasonic anemometer error. But at yaw $10^{\circ}$ or less, it was within the error of the ultrasonic anemometer itself. This is a very favorable characteristic to be used for wind turbine yaw control.

• 센서학회지
• /
• 제25권2호
• /
• pp.86-90
• /
• 2016

A 3D ultrasonic anemometer measures the direction and velocity of wind in a 3D space. The 2D ultrasonic anemometers developed by different manufacturers do not differ significantly in terms of their form or structure. The 3D ultrasonic anemometers, on the other hand, have more diverse forms than their 2D counterparts depending on the measurement algorithms and methods. Designing and reviewing the structure at the initial stage and defining its performance objectives are time-consuming processes. The process can be made cost-effective and time-saving if the validity is tested by model design and structural interpretation, and the structure is designed to withstand high wind velocities. This study presents the results of a 3D ultrasonic anemometer on real sample data by using a 3D modeling program, CATIA, for ultrasonic anemometer modeling.

• 센서학회지
• /
• 제22권4호
• /
• pp.292-296
• /
• 2013

The ultrasonic wind sensor that pass through the air, beating the delivery of ultrasonic wind speed increases or decreases by the physical characteristics of the wind speed and the direction of the sensor, the transmission and reception of ultrasonic time difference measured by a two-axis vector wind and wind speed measured by calculating a device that converts the digital signal is Anemometer and wind direction meteorological facilities management, management of the ship sail used for various purposes, including, but used the existing 3-cup (mechanical) anemometer wind rotor caused by mechanical wear parts replacement due to the short-term, the reliability of the product is low, parts replacement, and according to the characteristics caused the car, there is a problem in high maintenance costs. In addition, because the bearings use of the marine environment and the cryogenic environment was constrained. In this study, the excellent long-term reliability, using ultrasonic-type environment that is not constrained to produce wind anemometer located $90^{\circ}$ conformal road using four piezoelectric sensors were fabricated structures, the piezoelectric oscillator circuit produces a rash and receiving transmit and receive speeds the car through the two-axis vector calculation to measure wind velocity processor firmware programming, and its characteristics were tested.

• Journal of Advanced Marine Engineering and Technology
• /
• 제39권2호
• /
• pp.166-171
• /
• 2015

Recently, the international standard RS-422 serial communication, which was primarily designed for the communications between micro-controllers, has been used as a communication method on the ship. However, as the NMEA (National Marine Electronics Association) 2000 standardization progresses recently, a high-speed Ethernet-based communication environment is expected to be an alternative communication method instead of the RS-422 gradually. In addition, the ship's main instrumentation equipment with versatility and convenience is implemented to control devices as monitoring and controlling tools. This paper describes an implementation of wireless ultrasonic anemometer and anemoscope data processing and logger system using PC network, where the control processing equipment such as a separate operational console, data-logger, and indicator is required for the system. For these, the related element technologies to implement ultrasonic anemometer and anemoscope data processing system are expressed as a functional modules, and the NMEA 2000 standard certified data-logger system is implemented without the separate operational console.

• 센서학회지
• /
• 제15권6호
• /
• pp.442-448
• /
• 2006

Ultrasonic anemometers using pulse envelope detection-based method are standard instruments in most meteorological studies. In this paper, a new phase measurement method is tried to achieve the enhanced resolution without changing dimensions. The measurement sensitivity, dynamic range, and measurement speed of the new instrument are 0.2 mm/s, 13.3 m/s, and 13 measurements/sec, respectively. A graphic user interface is added to show the velocity and direction of the wind with the speed of sound and temperature of the wind in the 3 dimensional space. The new anemometer could be useful for the measurement of the air speed, the flow of fluids, and even air flow inside the downtown buildings.

• 한국항행학회논문지
• /
• 제15권1호
• /
• pp.25-31
• /
• 2011

최근에는 NMEA 2000 프로토콜이 SOLAS 선박의 실시간 네트워크 장비의 표준으로 인증 된다. 본 논문에서는 항해 필수 장비인 초음파 센서를 이용한 NMEA 2000이 탑재된 2차원 풍향 풍속계를 개발하였다. 개발된 시스템은 NMEA 2000 장비와의 연결을 테스트하기 위해 수심, 속도, GPS 장비로 구성된 NMEA 2000 네트워크에 연결하였으며, 기존에 제작된 타사 풍향 풍속계와 비교하기 위해 기능시험을 수행하였다.

• 한국통신학회논문지
• /
• 제39C권2호
• /
• pp.184-190
• /
• 2014

선박 통신은 1993년 ISO에서 국제 표준 규격인 RS-422통신을 이용하며, 마이크로컨트롤러들 간의 통신을 위해 설계된 시리얼 네트워크 통신 방식을 사용하였으나, 최근 NMEA2000 표준화가 진행됨에 따라 점차 빠르게 Ethernet 기반 통신 환경으로 대체 되어질 전망이다. 선박에서 사용되어지고 있는 주요 계측 장비들은 점차 범용성과 편의성을 가지는 최신 장치들을 이용해 이를 관리하게 되어짐에 따라 선박 내 다양한 곳에서 이를 활용하여 제어 및 관리 시스템들이 구현되어지고 있는 실정이다. 풍향 풍속계는 선박의 마스트 끝이나 풍력 단지 가장 높은 곳에 일반적으로 설치되어 풍향과 풍속을 계측하는 장비로써, 국제해사기구(IMO : International Maritime Organization)의 규정에 따라 필수 장비로 선박에 탑재되고 있는 장비이다. 본 논문에서는 초음파 풍향 풍속 시스템을 처리하기 위해 기존에는 별도 제어 콘솔, 데이터 로거(data-logger), 인디케이터(Indicator) 등의 제어 처리를 위한 기반 장비들이 필요하였던 시스템을 사용자 환경에 따른 PC NETWORK를 이용하여 풍향 풍속 자료 처리시스템을 구현하였다. 또한, 초음파 풍향 풍속 자료 처리 시스템을 구현하기 위한 요소 기술을 기능별 함수로 나타내었으며, NMEA 2000 표준 인증에서도 별도의 운용 콘솔 없이 풍향 풍속 자료의 처리를 위한 자료 처리 운용시스템의 기능들을 구현하고자 하였다.

• 한국자동차공학회논문집
• /
• 제4권1호
• /
• pp.86-95
• /
• 1996

This study was on the pollution emissions of the Ultrasonic fuel feeding system in gasoline injection vehicle. This work measured th SMD of the fuel, and compared the characteristics through chassis dynamometer and highway road test by the conventional vehicle. And this work measured vacuum degree, turbulence intensity and the rate of fuel consumption according to intake air velocity with swirler. The results are as followed; The effects of the vehicle installed the ultrasonic fuel feeding system are better than those of the conventional vehicle.

• Wind and Structures
• /
• 제30권2호
• /
• pp.199-210
• /
• 2020

Building wind pressure coefficient transiting test is a new method to test the building wind pressure coefficient by using the wind generated by a moving vehicle, which is susceptible to natural wind and other factors. In this paper, the Commonwealth Advisory Aeronautical Research Council standard model with a scale ratio of 1:300 is used as the test object, and the wind pressure coefficient transiting test is repeated under different natural wind conditions to study the influence of natural wind. Natural wind is measured by an ultrasonic anemometer at a fixed location. All building wind pressure coefficient transiting tests meet the test conditions, and the vehicle's driving speed is 72 km/h. The mean wind pressure coefficient, the fluctuating wind pressure coefficient, and the correlation coefficient of wind pressure are used to describe the influence of natural wind on the building wind pressure coefficient transiting test qualitatively and quantitatively. Some rules, which can also help subsequent transiting tests, are also summarized.