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RISS 인기검색어
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- 저자 : Nigel White (검색결과 2 건)
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Comparative Study on Time Averaged Wave Drifting Force
Frank Lin,Nigel White,Mohammad Hajiarab,Jun-Bum Park 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
With the evolution of technology, newly built ships become larger in size, and the second order hydrodynamics starts playing its role. The added wave resistance for a large vessel and longitudinal and horizontal drifting force on a FPSO are well known examples. In this paper a direct pressure integration method is presented and applied to a few comparative studies. First the results of longitudinal drifting force in short regular incident waves are compared with the experiments. Another case is for a FPSO in which the mean wave drifting forces for a number of wave conditions obtained from WAVELOAD are compared with the same AQWA model. Finally vertical and lateral wave drifting forces for a two-ship interaction model is analyzed and compared with the experimental data. The advantage and disadvantage of the direct pressure integration method is addressed and some key factors in computation of drifting force with the presented method are discussed.
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Effects of Whipping on Design Bending Moments of an Ultra Large Container Ship
Zhenhong Wang,Nigel White,Yongwon Lee,Jun-Bum Park 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
The design vertical wave bending moments of an ultra large container ship due to whipping responses are estimated using time domain simulation techniques in both regular and irregular waves based on the Lloyd's Register analysis procedure "Guidance Notes on the Assessment of Global Design Loads of Large Container Ships and Other Ships Prone to Whipping and Springing". The linear hydrodynamic analysis in frequency domain is first carried out to obtain the linear hydrodynamic forces then the these forces being transferred to time domain by convolution integral, the incident wave forces and slamming loads are calculated at each time step. The global structural responses are calculated by using the modal approach for computing the seakeeping responses finally.
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