扁平潜器微速操纵性研究

针对扁平潜器的特点建立了其微速操纵性运动方程,提出了忽略攻角、漂角与旋转角速度耦合影响的水动力模型,由拖曳水池模型试验确定了攻角、漂角水动力,近似估算了旋转水动力.在主辅推进器的PD控制下,数值仿真计算了水平面航向保持与改变、垂直面潜浮的微速运动控制.     

深潜器大开口球形耐压操纵舱结构模型的力学性能

结合模型试验和数值计算对大潜深、带大开口的球形耐压结构静态力学性能进行了研究。研究中考虑到材料非线性、非弹性的因素,通过对材料拉伸试验曲线的分析,得到了材料应力-应变的近似表达式;并且利用超声测厚仪对结构模型的几何缺陷进行了测量。同时基于参数化设计语言建立了有随机几何缺陷的有限元模型,并利用接触单元考虑了大开口观察窗与耐压结构的联系。试验验证表明论文提出的利用有限元软件分析大潜深、大开口耐压壳体力学性能的计算方法和计算策略是准确可靠的,所获得的结果可供设计使用。     

坐底式平台沉浮稳性研究与计算

坐底式平台的沉浮稳性与它的作业性能密切相关。随着平台作业水深的不断加大,现有平台的沉浮稳性为操作者、设计者及船检部门所重视。文中分析了现有规范对沉浮稳性的衡准,介绍了计算沉浮稳性的程序框图及计算实例。对提高沉浮作业工况的安全性,给出了一些建议,供平台设计和操作者参考。     

HDPE圆形升降式网箱下沉时最大倾角的研究

分析了1种HDPE双浮管圆形升降式网箱的沉降过程,并利用几何分析方法找出该升降式网箱沉降的最大倾角与网箱系统参数之间的关系,制作1个圆形升降式网箱模型,在静水池中进行沉降实验。试验过程中,通过水下摄像及图像处理软件找出网箱沉降时的最大倾角。模型网箱最大沉降倾角的理论计算值为22.77(°),实验观测值20.80(°),二者误差为9.4%,最大倾角的理论计算值和试验测量值基本吻合,说明理论计算方法是可行的。据此,计算出国内常用的周长40 m的HDPE双浮管圆形升降式网箱的最大沉降倾角为31.29(°)。并以周长40 m的双浮管HDPE圆形升降式网箱的尺度参数作为参考,分析该网箱浮绳框边长、沉降水深和网箱直径与网箱最大沉降倾角的关系,得出这三者与沉降倾角呈线性关系的结果,为HDPE双浮管圆形升降式网箱的设计及安全操作提供了理论依据。     

深水潜标的耐压计算与变形分析

深海观测潜标是一种深海观测仪器设备,用于深海底部的环境观测和研究。深海潜标设计的难点之一是潜标壳体的结构设计、耐压计算及材料选择。在初步设计的基础上,利用abaqus软件,采用有限元方法,计算出额定外压下壳体的形变,并进行了额定外压下的失稳计算,计算了壳体在高压环境下的体积和浮力变化。通过计算结果的分析比较,选择了合适的材料,设计出满足强度要求的壳体。     

低速潜器水动力试验及操纵运动预报

本文用平面运动机构测定了作用在低速潜器上的水动力，并用富里埃级数来表达大攻角范围时的水动力。在此基础上，用计算机进行模拟计算，预报了低速潜器的部分操纵性能     

Recent tectonics of the Blanco Ridge,eastern blanco transform fault zone

Bathymetric, hydro-acoustic, seismic, submersible, and gravity data are used to investigate the active tectonics of the eastern Blanco Transform Fault Zone (BTFZ). The eastern BTFZ is dominated by the 150 km long transform-parallel Blanco Ridge (BR) which is a right-lateral strike-slip fault bordered to the east and west by the Gorda and Cascadia Depressions. Acoustic locations, fault-parameter information, and slip vector estimates of 43 earthquakes (M _w3.8) that occurred along the eastern BTFZ over the last 5 years reveal that the Blanco Ridge is a high-angle right-lateral strike-slip fault, with a small component of dip-slip motion, where the Juan de Fuca plate is the hanging wall relative to the Pacific plate. Furthermore, the Cascadia and Gorda basins are undergoing normal faulting with extension predominantly oblique to the transform trend. Seafloor submersible observations agree with previous hypotheses that the active transform fault trace is the elongate basin that runs the length of the BR summit. Brecciated and undeformed basalt, diabase, and gabbro samples were collected at the four submersible survey sites along the Blanco Ridge. These petrologic samples indicate the Blanco Ridge is composed of an ocean crustal sequence that has been uplifted and highly fractured. The petrologic samples also appear to show an increase in elevation of the crustal section from east to west along the Blanco Ridge, with gabbros exposed at a shallower depth farther west along the southern (Pacific plate side) BR ridge flank. Further supporting evidence for BR uplift exists in the seismic reflection profiles across the BR showing uplift of turbidite sequences along the north and south ridge base, and gravity and magnetics profiles that indicate possible basement uplift and a low-density zone centered on the ridge's Pacific plate side. The BR formation mechanism preferred here is first, uplift achieved partially through strike-slip motion (with a small dip-slip component). Second, seawater penetration along the fault into the lower crust upper mantle, which then enhanced formation and intrusion of a mantle-derived serpentinized-peridotite diapir into the shallow ocean crust, causing further uplift along the fault.     

A Study on the Maneuvering Motion of a Low Speed Submersible

In this paper,the maneuvering characteristics of a low speed submersible are investigated.First,the captive model tests are carried out to obtain the hydrodynamic forces acting on the submersibleusing a Planar Motion Mechanism(PMM).For the hydrodynamic forces within a wide range of attack an-gles,the hydrodynamic coefficients which are usually used in the conventional maneuvering motion arequite difficult to be applied.In this case,a Fourier series is adopted to represent the hydrodynamic forcesand it fits the experimental data well.Then,based on the experimental results the simulation calculationsare made to predict some of the maneuvering performance of the low speed submersible.