• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2009.04a
• /
• pp.49-59
• /
• 2009

Vibrations of the tower structures of 750kW and 6kW wind turbines(WT) are investigated by measurement and analysis. Acceleration responses of the WT towers under various operation condition are monitored in real time by the remote monitoring system using LabVIEW. Using the monitoring system, resonance condition of the tower structures is diagnosed with the wind speed data within the operating speed range. To predict the tower resonance frequency, 750 kW tower is modeled as an equivalent beam with a lumped mass and Rayleigh energy method is applied. For 6 kW WT, Rayleigh-Ritz analysis is carried out on the tower-cable coupled system. Calculated tower bending frequency is in good agreement with the measured value. Using the analysis model, parametric study is available in order to prevent the severe resonance.

• 한국신재생에너지학회:학술대회논문집
• /
• 2006.06a
• /
• pp.304-307
• /
• 2006

Recently, as the global warming by fossil fuels and the steep rise of the oil price become social issues, the interest for renewable energy producing system is increasing rapidly. Among these, the wind turbine is most highlighted because of its economic competitiveness. The tower is one of the main components of wind turbine, which occupying about 20% of overall turbine costs. The tower access door located to base part of the tower, is used to enter the tower. This is the main structural weak points because of door hole, weldment, etc. And so are the weldments between the cans and the flanges. In this study, for the top flange part of the tower, by FEM using ANSYS, we retrieved the maximum von Mises stress on that and carried out fatigue analysis using stresses at such weak points.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.7 no.1
• /
• pp.81-89
• /
• 2012

Commonly used horizontal-axis wind turbines (HAWT) have the following structure: two or three blades, a nacelle which contains power converting equipments, generators, and a tower which supports the nacelle. The generated power is transmitted from the nacelle to the ground. Due to this structure, the power transmission lines are twisted when the nacelle is yawing. Thus, slip ring or additional yaw control mechanism is required. We propose a new structure of HAWT which is free of this transmission line problem. Moreover, the size of inverter can be reduced since two generators are connected in parallel in our mechanism so that power is distributed. A controller for yawing is developed so that it works in harmony with the controller for power generation. A MPPT (Maximum Power Point tracking) algorithm is implemented for the proposed system and efficiency of the system is validated by simulation.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2009.10a
• /
• pp.804-805
• /
• 2009

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2010.10a
• /
• pp.122-123
• /
• 2010

• 주택과사람들
• /
• s.222
• /
• pp.74-77
• /
• 2008

지난 2004년부터 해마다 '래미안 스타일'을 발표해 주거 문화 트렌드를 선도해온 삼성물산의 래미안 스타일 발표회가 올해로 5번째를 맞이했다. 소형 풍력 발전, 샘물 타워, 워터지 등 다양한 친환경 기술을 선보인 미래의 새로운 주거 문화 트렌드를 살펴보자.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2016.10a
• /
• pp.93-93
• /
• 2016

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.23 no.2
• /
• pp.209-215
• /
• 2010

In this study, seismic response analyses of a MW class wind-turbine have been conducted considering applied wind-loads using advanced computational method based on CFD and FEM. Typical lateral and vertical acceleration levels induced by earthquake is also considered herein. Practical numerical method for seismic response analysis of wind-turbine tower models are presented in the time-domain and the effects of wind load and seismic excitation for responses are compared to each other. It is importantly shown that possible earthquake effect during typical operating conditions should be taken into account in the design of huge wind-turbine tower systems because of its enormous inertia characteristics for induced maximum stress level.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.24 no.3
• /
• pp.219-226
• /
• 2014

A bus duct system for wind tower is introduced. A marine cable has been widely used in wind tower or various offshore structures. However, as the electric load capacity is increases, large number of cable lines must be used to cover the huge amount of electric capacities. Therefore, the installation of the cable lines becomes very difficult due to the heavy weight and volume of the cables. On the other hand, by using a single bus duct system line, the power capacity amount of 16 cables can be delivered with significantly compacted form. However, unlike flexible cables, the bus duct is relatively stiff which could generate the resonance phenomenon in the operating condition of the wind tower. In this study, the vibration characteristics of the bus duct are investigated and its long-term reliability during the life time of the wind tower is verified.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.38 no.7
• /
• pp.29-38
• /
• 2009

지난 20년간 급속한 발전을 통하여 회전 블레이드의 직경이 126 m, 나셀까지의 높이가 약 130 m에 이르는 6,000 kW의 용량을 가지는 풍력발전기가 개발되었다. 세계적으로 풍력발전의 필요성과 중요성이 인식되어 2008년 현재 약 120,000 MW의 설치 용량을 기록하고 있다. 풍력터빈(wind turbine)과 그 부품의 기계적인 성능평가의 종류와 방법은 많은 사람들의 관심인 것으로 판단한다. 우선 풍력터빈을 구성하는 주요 핵심부품은 블레이드, 증속장치, 발전기 등이며, 세부 구성 부품으로 허브, 핏치와 요베어링, 주축베어링, 타워 등이 있다. 주요핵심 부품인 블레이드, 증속기, 발전기 등의 성능평가가 중요한 이슈이다. 또한 모든 구성품을 조립하여 초기의 설계사양에 따라서 제조되고 최종성능이 발휘되는지 여부를 현장시험을 통하여 성능평가과정을 거치게 되는데 이 과정은 풍력터빈의 성능평가라고 하며 주요 평가대상은 출력성능(power performance), 소음(noise), 하중(load), 전력품질(power quality) 등 4가지 항목을 집중적으로 측정하여 개발된 풍력터빈의 전반적인 성능을 평가하게 된다. 본 투고에서는 핵심부품인 블레이드, 증속기, 발전기에 대한 시험기술과 풍력터빈의 성능평가 항목인 4개 측정 항목에 대하여 기술하였다.