Improved draft survey method based on densified table of offsets

LIU Chun-lei; ZHANG Xiu-feng; SUN Xiao-feng; YIN Yong

Volume 14 Issue 3

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LIU Chun-lei, ZHANG Xiu-feng, SUN Xiao-feng, YIN Yong. Improved draft survey method based on densified table of offsets[J]. Journal of Traffic and Transportation Engineering, 2014, 14(3): 58-64.

Citation:

LIU Chun-lei, ZHANG Xiu-feng, SUN Xiao-feng, YIN Yong. Improved draft survey method based on densified table of offsets[J]. Journal of Traffic and Transportation Engineering, 2014, 14(3): 58-64.

LIU Chun-lei, ZHANG Xiu-feng, SUN Xiao-feng, YIN Yong. Improved draft survey method based on densified table of offsets[J]. Journal of Traffic and Transportation Engineering, 2014, 14(3): 58-64.

Citation:

LIU Chun-lei, ZHANG Xiu-feng, SUN Xiao-feng, YIN Yong. Improved draft survey method based on densified table of offsets[J]. Journal of Traffic and Transportation Engineering, 2014, 14(3): 58-64.

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Improved draft survey method based on densified table of offsets

Key Laboratory of Marine Simulation and Control of Ministry of Communications, Dalian Maritime University, Dalian 116026, Liaoning, China

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Author Bio:
LIU Chun-lei (1987-), male, doctoral student, +86-411-84729651, 18940930042@163.com

YIN Yong (1969-), male, professor, PhD, +86-411-84723925, bushyin@163.com
Received Date: 2014-01-03
Publish Date: 2014-06-25

Abstract

Abstract

In order to improve the accuracy of draft survey, an improved draft survey method that did not depend on ship loading manual was developed.The displacement of ship was calculated by using high-precision ship database that was established based on the densified table of offsets.The floating state parameters and sagging (hogging) value of ship were calculated according to six draft readings.In order to calculate the sagging (hogging) value of each station, the deformation curve of ship was fitted by circular arc according to the beam bending theory in material mechanics.The ship database in sagging (hogging) condition was constructed by the correction of offsets coordinate point.The displacement of ship in free floatation was calculated by using floating state parameters, coordinate system transformation and S-H polygon clipping algorithm.Taking a bulk carrier as an example, the displacements of ship in even keel, trim and hogging condition were calculated respectively, and compared with the calculation result of traditional draft survey method.Calculation result indicates that in even keel condition, the average relative error of improved draft survey method is smaller, about 0.085 6%, the average relative errors increase to 0.414 5% and 0.619 9% in trim and hogging condition respectively.The calculation accuracy of improved draft survey method increases, the method can be applied tofree floatation of ship, and has a certain engineering application value.
- ship engineering,
- draft survey,
- densified table of offsets,
- floating state parameters,
- S-H clipping algorithm,
- free floatation,
- displacement

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References

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