多工况下玻璃钢双体游艇强度的计算研究

玻璃钢双体游艇在实际多工况条件下,危险截面情况比钢制双体船复杂,对其进行强度计算需要综合考虑艇体材料及结构的特殊性,目前相关研究和关注很少。以玻璃钢双体游艇为对象,根据结构特性、实际航行区域选取10种主要危险工况,采用有限元法进行多工况联合作用下全艇结构强度的计算研究。改变传统对危险截面的独立分析方式,提出对玻璃钢艇体材料采用二次赋值修正。研究显示,不同步扭转、横向弯曲、弯扭组合工况是发生强度失效的主因,不同步扭转工况是刚度失效的主因。获得了全艇对主应力变化的敏感结构、危险工况,及主要危险工况下玻璃钢面板最大、最小主应力的变化规律。在与传统规范法的对比中发现,规范法基于钢制船的设计思路所设计的局部结构偏于危险。文中的研究方法与结论对复合材料船艇的强度计算具有一定的参考价值。     

用改进的Noblesse新细长船理论算法探讨单体、双体船兴波

基于前期对Ｎｏｂｌｅｓｓｅ新细长船理论的改进工作,用改进的Ｎｏｂｌｅｓｓｅ新细长船理论算法探讨了单体、双体船兴波、采用首阶近似,以数学船型为例,计算了远场兴波、理论与实验结果吻合较好。     

基于径向基函数的双体风电运维船型线和片体间距优化

针对海上风电运维船快速性和低能耗的需求,利用径向基函数插值方法进行船体曲面重构,结合计算流体力学计算工具和遗传算法,以兴波阻力最小化为目标,在设计空间中探索兴波阻力最优的船型,开展双体风电运维船的型线及片体间距优化研究.以某双体风电运维船为研究对象,分别得到其在20 kn和30 kn航速的最优型线,与原始船型相比,阻力...     

高速穿浪双体船船型及性能研究

穿浪双体船（ＷＰＣ）是在小水线面双体船和高速以体船的基础上发展起来的一种新型高性能船，它保留发ＳＷＡＴＨ船型的低阻高速、甲板面积宽敞等特点，同时融合了Ｖ船型优良耐波性，作者对穿浪双体船的船型及阻力和耐波性等方面进行了研究。     

基于Mamdani推理法的双体无人艇模糊控制器设计

为研究适用于双体无人艇的运动控制方法,研究模糊控制技术在航速/航向这2个运动控制方面的应用。构建航速/航向模糊控制器：在航速控制器中选取三角形型隶属函数进行模糊化,在航向控制器中选取高斯型隶属函数进行模糊化;根据人的控制经验形成规则库;选取Mamdani法作为模糊推理方法;选取面积重心法作为解模糊的方法。仿真结果表明,模糊控制方法在双体无人艇的航速/航向控制是有效的。     

WAVE MAKING COMPUTATION IN TIME DOMAIN FOR MULTI-HULL SHIPS

1. INTRODUCTION For high-speed displacement ships, the wave making at the free surface is an important hydro- dynamic performance. The wave making reduction has attracted more attention for ship designers. The ship wave resistance and ship hull form improvement have been widely investigated. The thin ship theory adopting the Havelock source distribution on the ship centerline plane can be used to analyze the ship wave making profile and the ship wave resistance may be obtained by ship wav…     

WAVE RESISTANCE OF WAVE-PIERCING CATAMARANS

1.　 INTRODUCTIONIn1 983the new concept of wave-piercing catamaran( WPC) was proposed by an Aus-tralian scholarwho combined the virtuesofthe hull formsof SWATH and deep V ships,thestructure style of ordinary catamarans and the arc stud of hydrofoils,and overcame theshortcomings of each.The WPC has fine stability,high speed and good sea-keeping perfor-mance.The navigation area applied to the WPC is rather broad.Moreover it is convenientto general layout with the spacious deck.With t…     

一种双体气垫船波形计算方法

本文在前期工作［７］ 对 Ｎｏｂｌｅｓｓｅ 新细长船理论改进的基础上，将改进的 Ｎｏｂｌｅｓｓｅ 新细长船理论发展到双体气垫船，给出了一种快速、简便的双体气垫船波形计算方法。基于首阶近似，以数学船模和 Ｓ Ｅ Ｓ ４ 船模为例，计算了远场波形。理论与实验结果符合较好。     

Catamaran gantry crane for engineering–procurement–construction–installation contract

The objective of this article is to introduce a new piece of multi-purpose and cost-effective offshore installation equipment suitable for onshore fabrication work, shallow water oil and gas field development and wind turbine installation. Shallow water shall mean less than 100 m in this context. The equipment can also be used in the disused platform removal market, which will become a multi-billion dollars offshore business in the near future. The equipment has a special feature: it can be used to loadout a deck from the fabrication yard onto a material barge for towing to site, install the deck, then remove a disused deck and offload it from a material barge back to the yard for rework. With a simple modification, it can install wind turbine and minimal platform. Creating a sustainable business for the equipment is a key consideration.     

穿浪双体船纵向运动滑模控制

分析穿浪双体船实际应用中存在的问题,给出穿浪双体船纵向运动控制模型,并基于滑模控制理论设计减纵摇控制器。为了克服传统滑模控制存在的高频抖振问题,对控制律中的符号函数进行柔化处理,取得良好的减摇控制效果。仿真结果表明了本文方法的有效性。