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Alexander H. Day David Clelland Lawrence J. Doctors 《Journal of Marine Science and Technology》2009,14(3):387-397
This paper covers an extension of the study of Doctors et al. (J Ship Res 52(4):263–273, 2008) on oscillations in wave resistance during the constant-velocity phase of a towing-tank resistance test on a ship model to
the case of relatively shallow water. We demonstrate here that the unsteady effects are very prominent and that it is essentially
impossible to achieve a steady-state resistance curve in a towing tank of typical proportions for a water-depth-to-model-length
ratio of 0.25. This statement is particularly true in the speed region near a depth Froude number of unity. However, on the
positive side, we show here that an application of unsteady linearized wave-resistance theory provides an excellent prediction
of the measured total resistance, when one accounts for the form factor in the usual manner. Finally, a simple application
of the results to the planning and analysis of towing-tank tests is presented. 相似文献
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广州港沙角水域发生了两起大型拖带船组碰撞锚泊船的事故,其发生的时间、地点、性质有惊人的相似之处,本文从两起事故的共同点出发进行了详尽的原因分析,并提出了在狭窄水道进行大型拖航时应采取的安全措施。 相似文献
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建立了声纳拖曳装置主动伺服控制的数学模型,分析了造成系统跟踪误差的原因。将复合控制、预测控制和特殊数字积分器等技术应用于有海况可变的数字式控制仪的设计,取得了很好的控制效果。 相似文献
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Kenichi Kume Jun Hasegawa Yoshiaki Tsukada Junichi Fujisawa Ryohei Fukasawa Munehiko Hinatsu 《Journal of Marine Science and Technology》2006,11(2):65-75
This article presents hydrodynamic forces and moments, surface pressures, estimated side force distributions, and wakes under
oblique towing conditions for a practical tanker model (model KVLCC2M), which was designed by the Korea Research Institute
of Ships and Ocean Engineering (KRISO). Ship offset data is readily available and can be obtained from the Internet. The model
ship has no appendages and no rudder. Trim and sinkage were adjusted to zero in the static condition and the model ship was
constrained against any motion. Although the drift angle β was primarily set to 0°, 6°, and 12°, other settings were used in some experiments. All experimental results were processed
using uncertainty analysis. The uncertainty analyzing method follows the ANSI/ASME Performance Test Code (PTC19.1-1985) and
the AIAA Standard S-071-1995. Only a few error components were considered here and they were empirically chosen because they
had a heavy weighting when used in the uncertainty calculation. The results of these towing tank experiments will contribute
to the development of computational fluid dynamics (CFD) research in ship hydrodynamics. 相似文献
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超大型无动力船舶的拖航是一项高难度的航海作业,尤其是在通航环境复杂的狭水道水域。对于一项难度较大的引航工作,先进行可行性论证,是达到安全引航的必要前提。通过对超大型无动力船舶拖航的实际操纵。总结了拖航的经验,提出了超大型无动力船舶在狭水道拖航操纵作业的相关注意事项。 相似文献
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介绍了浮式风机的三种基础结构型式,重点对TLP平台干拖和湿拖两种拖航运输方案进行探讨,提出了适用于浮式风机TLP平台的装船、运输、安装一体船的运输方法。 相似文献