Dynamics and control of a towed underwater vehicle system, part I: model development     

B. Buckham  M. Nahon  M. Seto  X. Zhao  C. Lambert 《Ocean Engineering》2003,30(4):82-470

Autonomous vehicles are being developed to replace the conventional, manned surface vehicles that tow mine hunting towed platforms. While a wide body of work exists that describes numerical models of towed systems, they usually include relatively simple models of the towed bodies and neglect the dynamics of the towing vehicle. For systems in which the mass of the towing vehicle is comparable to that of the towed vehicle, it becomes important to consider the dynamics of both vehicles. In this work, we describe the development of a numerical model that accurately captures the dynamics of these new mine hunting systems. We use a lumped mass approximation for the towcable and couple this model to non-linear numerical models of an autonomous surface vehicle and an actively controlled towfish. Within the dynamics models of the two vehicles, we include non-linear controllers to allow accurate maneuvering of the towed system.  相似文献   

渤海南部表层沉积的相特征   总被引：1，自引：0，他引：1  

王琦  赵其渊  杨作升  周莉  沈渭铨  周伟  李平 《中国海洋大学学报(自然科学版)》1989,(1)

通过海上调查及实验室分析,查明渤海南部表层沉积物在结构类型、矿物组合、生物组分及沉积构造等相特征方面具有明显的分区性。渤海南部存在五种沉积相:黄河水下三角洲相、陆架盆地相、海湾相、潮流浅滩相及古滨岸相。黄河水下三角洲相从河口延至水深15—20米处,沉积速率很高,沉积物富含碎屑云母及CaCo_3。陆架盆地相的沉积为粉砂质粘土,具有生物扰动构造。  相似文献   

A method for detecting the breaking of wind-generated waves in deep water   总被引：1，自引：0，他引：1  

Xu Delun  Lou Shunli  Zhao Meng  Liu Wentong 《海洋学报(英文版)》1991,10(2):281-285

The breaking of wind-generated waves is an important phenomenon in the ocean, having close relation to many aspects of the ocean, such as air-sea interaction, ocean wave dynamics, oceanic remote sensing and ocean engineering. The first problem encountered in both its theoretical study and practical measurement is how to detect the breaking of waves.  相似文献   

Cheniers in China: An overview   总被引：6，自引：0，他引：6  

Xitao Zhao 《Marine Geology》1989,90(4):311-320

In various regions along the east and southeast coast of China and on the outer shelf of the East China Sea, series of cheniers have been found and studied. Their geomorphological and sedimentological features have been described and the main conditions for their formation established.

The development of cheniers in China can be divided into three periods: 24,000-15,000 yrs B.P., 7000-5000 yrs B.P. and 5000 yrs B.P. onwards. These periods have been based on ¹⁴C datings of 80 shell samples. The chenier groups of the three periods are distributed throughout various geomorphological locations.

Using the geomorphological locations of the cheniers in combination with their age of formation, the palaeopositions of the Chinese coastline in the various periods since 24,000 yrs B.P. are described. The history of the position of the east coast of China, including the features attesting to sealevel changes during this era, is briefly discussed.  相似文献   

台湾海峡毛颚动物分布的初步研究   总被引：9，自引：0，他引：9  

蒋玫  王云龙  徐兆礼 《台湾海峡》2003,22(2):150-154

本文分析了台湾海峡毛颚动物的种类组成、数量分布特征，并就其与环境因素的关系进行了初步探讨．结果显示与台湾海峡西部、东海等邻近海域相比，本区毛颚动物具种数少，数量小，季节变化幅度较小等特点．它的数量分布状况与闽斯沿岸流、南海西南季风漂流以及黑潮支流在本区运动消长有关。  相似文献   

宁波渔业结构调整再创佳绩     

赵世养 《海洋信息》2002,(2)

  相似文献   

柴达木盆地新构造运动主要特征与成因机制   总被引：10，自引：0，他引：10  

杨明慧 《海洋地质与第四纪地质》1997,17(3):71-78

研究表明，在壳幔结构、地球物理背景、沉积物结构、多层关地幔和构造样式等方面，达木盆地与中国东部新生代裂谷类伸展盆地具有可比性，应该归属 展性盆 。盆地伸展和收缩作用相间进行，伸展起因于地幔底辟；而收缩受两人因素影响；（１）盆地伸展作用受相邻造山带反作用诱导的挤压应力；（２）板块碰撞传递的远程板内应力。在此基础邮新的构造期达木盆地演化的“双层模式”，即地幔上隆－地壳伸展；被动挤压＋板内应力－地壳收缩  相似文献   

黄海多毛类裂虫科小型种的初步研究     

孟凡  丁志虎  赵晶  吴宝铃 《海洋科学进展》1993,(1)

1987～1991年在黄海进行小型多毛类调查时,采到的裂虫科小型种标本,经鉴定有18种,其中9种在我国是首次记录。  相似文献   

中国陆架海绿石分布特征及其意义   总被引：4，自引：0，他引：4  

赵全基  彭汉昌  张壮域 《海洋科学》1992,16(5):41-44

本文根据实际资料,简要概括了中国大陆架海绿石的分布规律和形成环境。海绿石的富集区与氧化环境,粗粒沉积和残留沉积区相一致。该研究为恢复古沉积环境提供了依据。  相似文献   

以风浪成长阶段因子为参量的波高分布     

黄培基  赵炳来  刘来臣  蒲书箴 《海洋学报》1981,3(4):639-654

在风的直接作用下产生的风浪,由于复杂的生成和发展条件,使其具有外观上的不规则性和随机性,内在的非线性性.早在五十年代初期,人们就针对风浪的随机性,运用统计方法,对风浪的统计性质进行了分析研究.就其外观而言,这种统计性质,主要由波面纵座标、波要素等的概率分布来描述,在把风浪作为一线性流体动力学模式来描述时,获得波面纵座标遵循正态分布律.  相似文献