Model experimental analysis of load responses of ultra-large vessels under different wave directions

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (19) : 112-118.

Chen Zhan-yang, LI Zhi-peng

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Abstract

It is of great importance to evaluate the vibrations response of ultra-large vessels under different wave directions. The segmented ship model test in oblique wave of an ultra-large container ship was carried out in a towing tank. The design principle of segmented ship model and oblique wave test system were introduced detailedly. The number of segments of model was changed to study the influence of hull elastic effect on vibration responses. Experimental results show that the elastic effect of hull has great influence on the whipping, and the lower the natural frequency of hull is, the earlier the whipping phenomenon occurs. Finally，time trace of bending moments and slamming pressure under different wave directions is discussed, and the variation of the different bending moment components and slamming pressure with wave directions and ratio of wave length to ship length was analyzed．It was shown that the most serious whipping is in head waves, and the maximum bending moment in oblique wave is near to λ/(L•cos β)=1.0. Compared with the low frequency wave moments, the high frequency load responses is more sensitive to the change of wave direction.

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ultra-large vessel / segmented model experiment / wave loads / slamming / whipping

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Chen Zhan-yang, LI Zhi-peng. Model experimental analysis of load responses of ultra-large vessels under different wave directions[J]. Journal of Vibration and Shock, 2017, 36(19): 112-118

References

[1] Marón A., Kapsenberg G. Design of a ship model for hydro-elastic experiments in waves, International Journal of Naval Architecture and Ocean Engineering, 2014, 6: 1130-1147.
[2] Lee K-H, Cho S, Kim K-T, Kim J-G, Lee P-S. Hydroelastic analysis of floating structures with liquid tanks and comparison with experimental tests [J]. Applied Ocean Research, 2015, 52: 167-187.
[3] Jason Lavroff, Michael R. Davis, Damien S. Holloway, Giles Thomas. The Whipping Vibratory Response of a Hydroelastic Segmented Catamaran Model[C]//Ninth International Conference on Fast Sea TransportationFAST2007, Shanghai, China, September 2007.
[4] Jiao J.L., Ren H.L., Adenya C.A. Experimental and Numerical Analysis of Hull Girder Vibrations and Bow Impact of a Large Ship Sailing in Waves, Shock and Vibration 2015: 1-10.
[5] JM. Rousset, P. Ferrant, B. Alessandrini，Experiments on a segmented ship model in directional irregular waves，Proc. Of the 21th IWWWFB, 2010.
[6] CHEN Zhanyang，REN Huilong，LI Hui，et al. Experimental and numerical analysis of bow slamming and whipping in different sea states [J].Journal of Ship Mechanics, 2012, 16(3):246-253.
[7] Ingo Drummena, MingKang Wu, Torgeir Moanl. Experimental and numerical study of containership responses in severe head seas [J]. Marine Structures. 2009, 22,172-193.
[8] Ivo Senjanovic, Sime Malenica, Stipe Tomasevic. Hydroelasticity of large container ships [J]. Marine Structures. 2009,(22):287-314
[9] JIAO J-L, REN H-L, SUN S-Z, ADENYA C-A. Investigation of a ship’s hydroelasticity and seakeeping performance by means of large-scale segmented self-propelling model sea trial [J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2015, 16(5): 387-404.
[10] 翟钢军，程勇，马哲. 超大型浮式储油船的水弹性响应预报[J]. 振动与冲击.2014,33(1):141-148.
ZHAI Gang-Jun, CHENG Yong, MA Zhe. Hydroelastic response prediction of very large floating oil storage vessel [J]. Journal of vibration and shock. 2014, 33(1):141-148.
[11] Kim J.H., Kim Y., Yuck R.H.. Comparison of slamming and whipping loads by fully coupled hydroelastic analysis and experimental measurement, Journal of Fluids and Structures, 2014,52: 145-165.
[12] 陈占阳，任慧龙，李辉. 水弹性理论与分段模型试验在船体振动响应分析中的应用[J]. 振动与冲击.2012,31(24):119-124.
CHEN Zhan-yang，REN Hui-long，LI Hui. Application of hydroelasticity theory and segmented model test in hull vibration response analysis [J]. Journal of vibration and shock. 2012, 31(24):119-124.