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RISS 인기검색어
- 검색키워드
- 저자 : ZHEN-Zhong Yuan(원진중) (검색결과 3 건)
- 무료
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ZHEN-Zhong Yuan(원진중),Eui-Chul Jung(정의철),Hee-Chang LIM(임희창) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
?;?;Since there has been a rapid progress to understand the dynamics of an offshore floating body under an ocean environment, we undertake to generate the ocean waves in a lab-scale wind-wave flume. The study is aiming to observe and optimize the similar ocean environmental condition as input wave and to reduce the wall reflective wave. Several absorption methods are suggested to optimize the propagate wave by measuring the maximum and minimum of the standing wave envelope. There has been no optimized absorption method, as they highly depend on the wave period and the wave length. One of the methods-two fixed wave gauges measuring two wave heights and one wave phase ? is applied in this study. In the present paper various approaches were used to analyze the results using the flume, by position of probes, with absorber and without absorber, different position, condition and angle of the wave absorber, This paper also focuses on the analysis of fundamental equations which describe the separating method of the incident and reflective wave, and finally we confirm that the wave absorber is highly efficient considering all the permutation and combination. From the study it is clear that there is a change in the wave amplitude at the receiving end then the generated end; wave absorber is a strong source to control the energy of the coming wave. With the changing the period of the wave, the reflectance is increasing when the period becomes larger.
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Optimum design of Wave Absorber in Various Sinusoidal Propagating Wave
Zhen-Zhong Yuan(원진중),Hee-Chang LIM(임희창) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Since there has been a rapid progress to understand the dynamics of the coastal wave under a sloping-wall-type breakwater, we undertake to simulate the coastal waves and wave absorbers in a lab-scale wave flume. The study is aiming to observe and optimize a similar ocean environment and to reduce the wall reflection in the wave flume. In order to generate the ocean waves in the wave flume, the combination of the flat-type wave generator and wave absorbers is installed at the channel. Two probes for measuring the wave heights (i.e., level gauges) are used to observe the temporal variation of wave surface as well as the phase difference and the maximum (crest)/minimum (trough) points between the propagating waves. In order to optimize the shape and size of propagating waves, several absorption methods are proposed ?vertical-porous-plates absorber, horizontal punching plates absorber, sloping-wall-type wave absorber and active wave absorption, but for the better option of the propagating waves, the sloping-wall-type wave absorbers are chosen and tested in terms of the constitutive filling materials and the location and shape of the frame. This paper also focuses on the theoretical prediction of the wave surface separating them into incident and reflective components. In the result, it clearly shows that the wave absorber with hard filling material has better performance than that of soft material; i.e., wave absorber can be a strong sink to control the energy of the coming wave. In addition, the larger wave absorber becomes, the lower the reflectance be since the larger volume can remove the on-coming wave energy better. Therefore, given that the same condition of absorber is provided, the reflectance becomes bigger as the wave period is longer. Finally, the reflectance of wave would be controlled under 0.1 in this study so that the wave flume would be applied for simulating the offshore environment.
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정의철(Eui-Chul Jung),원진중(Zhen-Zhong Yuan),임희창(Hee-Chang Lim) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.3
본 연구는 해상풍력발전을 위한 기초적인 연구로서 풍력타워에 가해지는 조파에 대한 타워의 거동을 해석하기 위한 장치를 구축하여 그 타당성연구를 하고자한다. 파고 발생이 수조 내부에서 적절히 만들어졌으며, 이를 고속카메라와 파고계를 이용하여 시간에 따른 인공적인 파고의 발생을 측정하였으며, 이때 조파기는 세 가지 주기에 따라 파고를 발생시켰다. 본 연구에서 최저 20mm에서 시작해서 최고 34mm까지의 파고를 만들어 낼 수 있는 조파수조를 설치하여 파고를 이용한 구조물과의 상관관계를 밝히는 데 큰 도움이 되었다. 고속카메라로 촬영한 가시화된 파고를 살펴보면 소파장치가 없을 때는 단순조화운동에 그쳤으나, 소파장치를 설치한 경우에는 진행파임을 확인할 수 있었다. This study used a water tank and wave maker to generate conditions similar to the real ocean environment. Given that the waves were properly generated in the water tank, a precise analysis indicated the quantitative value of the wave force acting on a body. A high-speed camera and wave-level gauge were used to measure the temporal wave motion and period. A series of artificial water waves were successfully generated using three different wave periods and amplitudes. Each of the waves captured by a high-speed camera was sinusoidal and did not maintain its shape properly without a wave absorber, but it was substantially improved and well shaped when the wave absorber was installed.
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