Optimization model of ballast water allocation for crane ship

LIU Zhi-jie; LIU Xiao-yu; XIONG Wei; LIN Cheng-xin

Volume 17 Issue 2

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LIU Zhi-jie, LIU Xiao-yu, XIONG Wei, LIN Cheng-xin. Optimization model of ballast water allocation for crane ship[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 83-89.

Citation:

LIU Zhi-jie, LIU Xiao-yu, XIONG Wei, LIN Cheng-xin. Optimization model of ballast water allocation for crane ship[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 83-89.

LIU Zhi-jie, LIU Xiao-yu, XIONG Wei, LIN Cheng-xin. Optimization model of ballast water allocation for crane ship[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 83-89.

Citation:

LIU Zhi-jie, LIU Xiao-yu, XIONG Wei, LIN Cheng-xin. Optimization model of ballast water allocation for crane ship[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 83-89.

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Optimization model of ballast water allocation for crane ship

Transportation Equipment and Ocean Engineering College, Dalian Maritime University, Dalian 116026, Liaoning, China

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Author Bio:
LIU Zhi-jie(1979-), male, associate professor, PhD, +86-411-84724292, liuzj2003@163.com
Received Date: 2016-11-15
Publish Date: 2017-04-25

Abstract

Abstract

Based on the hydrostatics and optimal theories of ship, the optimal model of ballast water allocation for crane ship was built.The optimal variables were the variations of water levels for all ballast tanks.The optimal objective was minimizing the ballast water's total allocation volume of ballast tanks.The constraint condition was hull balance in the lifting-allocating process.The ballast water allocation process of a crane ship with 8 ballast tanks was optimized by using MATLAB to reduce the energy consumption of crane ship.Calculation result shows that only 3 ballast tanks are used in the allocation process for the allocation scheme designed by engineering experience, and the requirement of hull balance is satisfied when the water in tank 1 is allocated into tanks 2, 8.When the proposed model is used, the water in tanks 1, 3, 4, 5, 6 is allocated into tanks 2, 8.Although 7 tanks are used in the allocation process, the total allocation volume reduces by 21% compared with the empirical scheme.For both the empirical scheme and optimal scheme, when the rotating angle of crane is 0, the ballast water allocation volumes are largest, and reach 487.5t and 256.0t, respectively.In order to avoid hull tilt caused by rapidly loading, the crane ship is loaded and allocated gradually at the moment.In the allocation process, when the water level of a ballast tank decreases to 0, the ballast water allocation volume will suddenly change at the next moment.At the moment, the crane should run slowly so that the ballast system can allocate enough ballast water to guarantee hull balance and avoid serious consequence.
- ship engineering,
- offshore hoisting,
- ballast system,
- ballast water allotment optimization,
- ballast tank,
- automated ballasting

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References(23)

References

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