水下运载器外挂负载的系统测试方案及仿真     

杨洪刚  连琏  葛彤 《海洋工程》2006,24(1):60-67

研究水下运载器外挂负载的测试问题,根据负载功能,建立了负载的系统模型。考虑到系统可测性,模型中增设一些辅助元件和电路,测试计算机通过与负载的自动驾驶计算机通讯,由自动驾驶计算机施加激励和采集响应,完成测试。最后,对测试方案进行了仿真试验,并分析了仿真结果。  相似文献   

Numerical Simulation of Dynamic Response of Supple Nets     

朱立新梁振林  黄六一赵芬芳 《中国海洋工程》2006,20(3):443-456

1 .Introduction Owing to the decline of capture fisheries andsaturation of traditional inshorefarms ,sea cage cul-ture as a newtype of aquaculture is developingrapidlyin China .However ,cage culture is a highriskoperation.The practice is vulnerable to natural hazards ,such as strong tides ,storms and typhoons .So,it is necessaryto assess the behavior of a sea cage exposedto waves and current before the designandinstallation of the structure . Computer simulation,due to its many advantages ,ha…  相似文献   

Influence of Current Width Variation on the Annual Mean Transport of the East Sakhalin Current: A Simple Model     

Yoichi?ShimadaEmail author  Atsushi?Kubokawa  Kay?I.?Ohshima 《Journal of Oceanography》2005,61(5):913-920

Recent observations suggest that the annual mean southward transport of the East Sakhalin Current (ESC) is significantly larger than the annual mean Sverdrup transport. Motivated by this observational result, transport of a western boundary current has been investigated using a simple numerical model with a western slope. This transport is defined as the instantaneous barotropic transport integrated from the western boundary to the offshore point where the barotropic velocity vanishes. The model, forced by seasonally varying wind stress, exhibits an annual mean of the western boundary current transport that is larger than that of the Sverdrup transport, as observed. The southward transport from October to March in the model nearly equals the instantaneous Sverdrup transport, while the southward transport from April to September decreases slowly. Although the Sverdrup transport in July vanishes, the southward transport in summer nearly maintains the annual mean Sverdrup transport, because the barotropic Rossby wave cannot intrude on the western slope. This summer transport causes the larger annual mean. Although there are some uncertainties in the estimation of the Sverdrup transport in the Sea of Okhotsk, the seasonal variation of the southward transport in the model is qualitatively similar to the observations.  相似文献   

智能潜器的集成仿真系统     

庞永杰  徐玉如  尚游  彭良 《海洋工程》1997,(4)

本文介绍了智能潜器集成仿真系统的硬、软件结构．通过这一系统所展示的水下虚拟仿真环境能够在研究和开发智能潜器的控制体系结构、潜器载体的水动力学、信息融合和目标识别等工作中发挥巨大作用  相似文献   

太平洋海域海平面变化的灰色系统分析   总被引：3，自引：1，他引：3  

左军成  陈宗镛  戚建华 《中国海洋大学学报(自然科学版)》1997,(2)

应用灰色系统理论，对太平洋海域４８个长期验潮站的月均海平面分别建立了ＧＭ（１，１）模型。ＧＭ（１，１）模型能较好地反映太平洋海域的海平面变化的趋势，它除了能给出连续的海平面变化速率外，同时能方便地给出海平面变化的加速率。模拟结果表明，在太平洋地壳均衡假设下，太平洋海域的月均海平面以平均速率０．１７ｃｍ／ａ上升。在太平洋海域所取的４８个长期验潮站中，有４０个站在加速上升，全部站的平均加速度为０．０００２９ｃｍ／ａ２。且加速率逐渐增大。当然这些加速率都很小，但作为一种普遍性的趋势，这已足以说明：太平洋海域的海平面在加速上升  相似文献   

南方鲇成鱼的静止代谢率的季节变化   总被引：7，自引：0，他引：7  

曹振东  谢小军 《海洋与湖沼》1996,27(6):619-625

于１９９１年９月－１９９２年７月，运用连续流水呼吸仪测定由嘉陵江捕获的南方鲇成鱼的静止代谢率，在１０．０，１６．０，２１．８，２２．２和２７．４℃条件下，雌鱼的测定值是８．６９９，２１．９８０，２５．４１２，３０．５６３，３４．４６３和３２．４８３Ｏ２ｍｇ／（ｋｇ．ｈ）；雄鱼的是８．１４，１９．５６８，２６，８３０，２９。４２６，３２，１５６和３２．０９８Ｏ２ｍｇ／（ｋｇ．ｈ）。采用统计模型，将测  相似文献   

中国近海鱼类生活史型与生态学参数地理变异   总被引：11，自引：0，他引：11  

罗秉征 《海洋与湖沼》1992,23(1):63-73

根据1985－1986年东海北部近海调查材料及其它有关文献，对43种鱼计74个种群或群体的生活史选择型及其生态参数进行了比较研究。结果表明，分布于我国近海的主要鱼类大多偏于r选择型。对r－K选择鱼种的资源特征及其对捕捞的反应作了阐述。各鱼种的种群生态学参数在种间和空间分布均表现出地理变异。  相似文献   

中华乌塘鳢的群体生物学研究 Ⅱ.生化遗传变异     

李刚 《热带海洋学报》1991,(2)

用同工酶谱法发现中华乌塘鳢Bostrichthy sinensis四个群体的遗传变异水平很低,在所检测的30个基因座位中,多态座位比例只有0—10％,平均杂合度仅为0.2—0.5％,物种的平均杂合度为0.33±0.10％。四个群体共享常见的等位基因。虽然其中三个群体拥有特有的等位基因,但其基因频率都未超过5％。四个群体的Nei氏遗传距只有1.68—12.13×10~(-5)。据分析,近交可能是遗传变异水平低和形态特征分化差的主要原因。种苗生产上应注意广泛采集不同地理群体的鱼作亲鱼,以丰富养殖群体的基因库。  相似文献   

西北太平洋热带气旋发生的时空变化特征   总被引：8，自引：0，他引：8  

杨亚新 《海洋预报》2005,22(1):86-91

利用中国气象局整编的1949-1988年的《台风年鉴》和1989-2000年的《热带气旋年鉴》资料，统计分析了西北太平洋热带气旋的主要发生源地、各强度等级热带气旋发生的经纬度变化特征、各强度等级热带气旋发生源地和发生频率的季节变化特征。结果表明：西北太平洋有三个热带气旋的主要发生地，分别是南海中北部偏东洋面、菲律宾以东至加罗林群岛之间的洋面、加罗林群岛一带洋面；热带气旋强度越强，发生位置越偏南、偏东；热带气旋平均发生源地存在明显的季节变化特征，冬季平均发生源地偏南偏东，以后逐渐向北向西偏移，夏季以后又向南向东偏移；各强度等级热带气旋2月平均发生频率最小，8月平均发生频率最大，全年TC较集中地发生在7～10月期间。  相似文献   

Circulation on the north central Chukchi Sea shelf   总被引：8，自引：0，他引：8  

Thomas Weingartner  Knut Aagaard  Rebecca Woodgate  Seth Danielson  Yasunori Sasaki  Donald Cavalieri 《Deep Sea Research Part II: Topical Studies in Oceanography》2005,52(24-26):3150

Mooring and shipboard data collected between 1992 and 1995 delineate the circulation over the north central Chukchi shelf. Previous studies indicated that Pacific waters crossed the Chukchi shelf through Herald Valley (in the west) and Barrow Canyon (in the east). We find a third branch (through the Central Channel) onto the outer shelf. The Central Channel transport varies seasonally in phase with Bering Strait transport, and is 0.2 Sv on average, although some of this might include water entrained from the outflow through Herald Valley. A portion of the Central Channel outflow moves eastward and converges with the Alaskan Coastal Current at the head of Barrow Canyon. The remainder appears to continue northeastward over the central outer shelf toward the shelfbreak, joined by outflow from Herald Valley. The mean flow opposes the prevailing winds and is primarily forced by the sea-level slope between the Pacific and Arctic oceans. Current variations are mainly wind forced, but baroclinic forcing, associated with upstream dense-water formation in coastal polynyas might occasionally be important.Winter water-mass modification depends crucially on the fall and winter winds, which control seasonal ice development. An extensive fall ice cover delays cooling, limits new ice formation, and results in little salinization. In such years, Bering shelf waters cross the Chukchi shelf with little modification. In contrast, extensive open water in fall leads to early and rapid cooling, and if accompanied by vigorous ice production within coastal polynyas, results in the production of high-salinity (>33) shelf waters. Such interannual variability likely affects slope processes and the transport of Pacific waters into the Arctic Ocean interior.  相似文献