Full Text:   <2017>

Summary:  <1567>

CLC number: U661.73

On-line Access: 2016-06-03

Received: 2015-08-01

Revision Accepted: 2015-12-15

Crosschecked: 2016-05-11

Cited: 2

Clicked: 3236

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Jia-long Jiao

http://orcid.org/0000-0001-5740-8865

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Journal of Zhejiang University SCIENCE A 2016 Vol.17 No.6 P.468-484

http://doi.org/10.1631/jzus.A1500218


Investigation of a ship’s hydroelasticity and seakeeping performance by means of large-scale segmented self-propelling model sea trials


Author(s):  Jia-long Jiao, Hui-long Ren, Shu-zheng Sun, Christiaan Adika Adenya

Affiliation(s):  College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China; more

Corresponding email(s):   renhuilong@hrbeu.edu.cn

Key Words:  Hydroelasticity, Seakeeping performance, Segmented model test, Large-scale model test, Sea trial, Scale effects


Jia-long Jiao, Hui-long Ren, Shu-zheng Sun, Christiaan Adika Adenya. Investigation of a ship’s hydroelasticity and seakeeping performance by means of large-scale segmented self-propelling model sea trials[J]. Journal of Zhejiang University Science A, 2016, 17(6): 468-484.

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Abstract: 
The traditional laboratory models for the hydroelasticity and seakeeping performance of ships are tested in calm water and in uni-directional, artificially generated waves. A new alternative to the tank model measurement methodology is to conduct experiments using large-scale models in actual sea conditions. To implement the tests, a large-scale segmented self-propelling model and testing system were designed and assembled. A buoy wave meter was adopted to record the coastal waves that the model encountered during the tests. The analysis of the results of waves in sheltered waters by the spectral method shows good agreement with ISSC spectra. To investigate the difference between this new methodology and the traditional towing tank tests, a small-scale model, whose type and configuration are the same as those of the large-scale model ship, was used and tests were conducted in a towing tank. Comparison of the two experimental results shows that there is a remarkable difference in the response characteristics between the large-scale model at sea and the small-scale model in the tank. Numerical simulations of the responses of the ship under equivalent sea states were also carried out. The influence of directional spreading functions on the results was analyzed by a numerical approach. The classical model tests under long-crested waves in the towing tank over-estimate the motion and wave load responses; however, large-scale model tests carried out at sea are more reasonable for ship design and scientific research.

The authors developed and conducted a large-scale model for the test of ship hydroelasticity and seakeeping performance at actual sea conditions, which will help get real and accurate motions and wave loads results for ship design. The manuscript is reasonably structured. The technique presented in the manuscript is sound.

实际海浪环境中大尺度自航船模的水弹性与耐波性试验研究

目的:为研究船舶在实际海浪环境中的水弹性与耐波性,本文提出一种新型模型试验技术。将相同 船型不同尺度的模型分别在近海环境和水池环境中测量的试验数据进行比较,分析两种试验方法所得结果的差异,以说明水池模型试验方法所存在的问题,从而进一步证明新型试验技术的优越性。
创新点:1. 提出大尺度自航模型在实际海浪环境中实施水动力试验的技术和方法;2. 将大尺度模型试验结果与传统水池模型试验结果进行比较,分析二者的差异。
方法:针对某母型船,分别建造缩尺比为1:25和1:50的大尺度模型和小尺度模型。大尺度模型在自然海域的三维海浪中进行试验测量,而小尺度模型在水池长峰不规则波中进行试验测量。测量过程中保证两者的控制参数相似,并分析试验结果存在的差异。将数值计算的结果与大尺度模型试验的结果进行比较,并基于数值计算分析海浪的方向分布函数对结果的影响。
结论:在近海海域中开展的大尺度模型耐波性与波浪载荷试验表明,本文提出的试验测试系统和试验方案是可行的。大尺度模型试验是在自然海浪环境中进行的,比水池环境更接近实船的实际航行环境,所得数据对于船舶设计和研发具有更高的参考价值和意义。

关键词:水弹性;耐波性;分段模型试验;大尺度模型试验;海试;尺度效应

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Reference

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