WAKE WASH OF A FAST SMALL BOAT IN RESTRICTED WATERS: MODEL TESTS AND FULL-SCALE MEASUREMENTS

IF 3.9 4区工程技术 Q1 ENGINEERING, MARINE

Brodogradnja Pub Date : 2022-03-01 DOI:10.21278/brod73206

M. A. Ismail, N. Shaharuddin, O. Yaakob, M. Jamal, F. A. Adnan, A. H. M. Rashidi, W. A. H. W. Azhary, Mohd Kamarul Huda Samion, A.N.D. Bachok, B. Ahmad, Nur Shafira Ahmad

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引用次数: 1

Abstract

This paper presents the model testing of an 8.23m boat with hard chine planning hull generated waves at the Kilim recreational park. Wake is considered one of the main causes of riverbank erosion due to the energy carried by waves hitting the riverbank. Initially, ship particulars were measured from actual boats to generate a hull form using MAXSURF software. A lines plan was then generated to fabricate the model using fibreglass. Experiments were conducted in the National Hydraulic Research Institute of Malaysia (NAHRIM) at various speeds at a constant operating draft. The wave patterns generated by the modelled boats at different speeds were recorded for analysis. Wave attenuation for deep water conditions was studied and it was found that the wave exponent, n ranged from -0.36 to -0.75 for all depth Froude number (Fnh) condition. Wave decay analysis was used to estimate wave height for defined water depth. For 11 people with an average mass of 65 kg on board, the produced wave height was greater than the permissible wave wake height of 75 mm. The generated energy exceeded 60 Joules/m for nearly all measured speeds. A boat speed of less than 5 knots was suggested for boats loaded with the maximum passenger limit of 11 people. Other recommendations were made to minimize the wave wake height produced by the modelled boat.

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受限水域中快速小船的尾流冲刷：模型试验和全尺寸测量

本文介绍了在Kilim休闲公园对一艘8.23米长的船进行的模型测试，该船采用硬机器规划船体产生的波浪。由于波浪冲击河岸所携带的能量，尾流被认为是河岸侵蚀的主要原因之一。最初，使用MAXSURF软件从实际船只中测量船只细节，以生成船体形状。然后生成一个线条平面图，用玻璃纤维制作模型。实验在马来西亚国家水利研究所（NAHRIM）以不同的速度在恒定的工作气流下进行。记录了模型船只在不同速度下产生的波浪模式，以进行分析。研究了深水条件下的波浪衰减，发现在全深度弗劳德数（Fnh）条件下，波浪指数n在-0.36至-0.75之间。波浪衰减分析用于估算确定水深的波高。对于船上平均质量为65公斤的11人来说，产生的波浪高度大于75毫米的允许波浪尾流高度。在几乎所有测量速度下，产生的能量都超过了60焦耳/米。建议最大载客量为11人的船只航速低于5节。还提出了其他建议，以尽量减少模型船产生的波浪尾流高度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Brodogradnja ENGINEERING, MARINE-

CiteScore

4.30

自引率

38.90%

发文量

审稿时长

>12 weeks

期刊介绍： The journal is devoted to multidisciplinary researches in the fields of theoretical and experimental naval architecture and oceanology as well as to challenging problems in shipbuilding as well shipping, offshore and related shipbuilding industries worldwide. The aim of the journal is to integrate technical interests in shipbuilding, ocean engineering, sea and ocean shipping, inland navigation and intermodal transportation as well as environmental issues, overall safety, objects for wind, marine and hydrokinetic renewable energy production and sustainable transportation development at seas, oceans and inland waterways in relations to shipbuilding and naval architecture. The journal focuses on hydrodynamics, structures, reliability, materials, construction, design, optimization, production engineering, building and organization of building, project management, repair and maintenance planning, information systems in shipyards, quality assurance as well as outfitting, powering, autonomous marine vehicles, power plants and equipment onboard. Brodogradnja publishes original scientific papers, review papers, preliminary communications and important professional papers relevant in engineering and technology.