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主要阐述了油轮单壳改双壳工程中的重点和难点一变形控制,介绍了在工程实施过程中采取分期分阶段施工的方法,合理安排现场工艺孔的开设,并加强施工过程中的现场监控和测量,使整体变形控制在2mm之内,符合船舶检验要求。 相似文献
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介绍了几次由于油轮洗舱引起的静电而导致的几次重大事故及其油舱洗舱的目的和分类,接着分析了洗舱中产生静电的原因,重点叙述了油舱洗舱的具体保护措施,在每个环节都要重视静电问题,日常操作和管理中严格执行油舱安全管理条例,减少和控制静电事故的发生。 相似文献
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一、油轮消防安全管理总体要求 船舶尤其是油轮的消防安全管理是一个系统工程,应始终贯穿于公司各项工作和船舶各种状态及各项活动(操作)之中。毋庸置疑,船舶一旦发生火灾将直接威胁人命、船舶以及货物的安全,甚至可能造成无法估量的环境破坏。为了保障船上人员生命安全和船舶的安全营运,在日常各项安全运行控制工作(活动)中加强船舶消防管理显得尤为重要。 相似文献
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油轮“钻石”的FPSO改装设计 总被引:1,自引:0,他引:1
FPSO是海洋石油开采的重要装备,旧油轮改装是FPSO的重要来源之一。文章以油轮"钻石"(RADIANT JEWEL)为例,介绍旧油轮的FPSO改装设计。 相似文献
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一、油轮消防安全管理总体要求 船舶尤其是油轮的消防安全管理是一个系统工程,应始终贯穿于公司各项工作和船舶各种状态及各项活动(操作)之中。毋庸置疑,船舶一旦发生火灾将直接威胁人命、船舶以及货物的安全,甚至可能造成无法估量的环境破坏。为了保障船上人员生命安全和船舶的安全营运,在日常各项安全运行控制工作(活动)中加强船舶消防管理显得尤为重要。 相似文献
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此文介绍了美国海岸警卫队对首航美国海域的油轮进行检视、目视、观察和巡视的控制项目,作者根据亲身接受检查的经历,提出了应付安全检查的对策,以便首航美国的油轮能顺利获得油轮安检证书(TVEL)。 相似文献
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挪威投行北极证券(Artvic Securities)航运部门的最新一份新年特别报告称,对于油轮行业,2012年甚至到2013年,原油油轮公司将面临激烈竞争,行业内大鱼吃小鱼的兼并战料将此起彼伏。 相似文献
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船舶营运能效管理计划即将实施,油轮公司将制定油轮能效管理计划和船队能效管理体系,通过计划和体系的实施,推进油轮公司船队更安全、节能、环保地营运。 相似文献
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The research performed in this paper was carried out to investigate the computational procedure to design seakeeping optimized ship hull form. To reach the optimized hull form, four stages should be done, which consists of: generate alternative hull form, seakeeping calculations, objective functions and optimization techniques. There are many parameters that may be determined in ship hull form optimization. This paper deals with developed strip theory for determining the seakeeping performance, genetic algorithm (GA) as optimization method, high order equations for curve fitting of the hull form and finally reaching to the minimum bow vertical motion in regular head waves. The Wigley hull is selected as an initial hull and carried to be optimized. Two cases are considered. For the first case, the only form coefficients of the hull (CB, CM, Cw, Cp) are changed and main dimensions (L, B, 7) are fixed. In the second case both hull form and main dimensions are varied simultaneously. Finally, optimized hull form and its seakeeping performances are presented. The results of optimization procedure demonstrate that the optimized hull forms yield a reduction in vertical motion and acceleration. 相似文献
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Wen -Jeng Hsueh 《Journal of Marine Science and Technology》1998,3(1):50-60
A semiactive-type absorber for vibration reduction of main hull girders was investigated. The semiactive absorber system includes a moving mass, support springs, dynamic dampers, and a control system. Only a small electrical power supply is needed for control of the damper valve and the operation of the control system. In this paper, the dynamics of the ship's hull and the constraints of the semiactive absorber are described first. Then, a suboptimal operation law is derived based on the properties of the absorber and the theory of optimal vibration reduction. The numerical simulation results show that the semiactive absorber is more efficient in hull vibration reduction than the passive absorber during critical periodical excitation from the propeller. The vibration caused by multifrequency excitation can also be suppressed by the semiactive absorber. In terms of effectiveness, the semiactive absorber is almost as effective as the active absorber. In particular, the performance of the semiactive absorber is excellent in the reduction of high-frequency fluctuations.List of symbols
C
h
(i)
damping matrices of the segmenti
-
C
sb
structural damping coefficient of bending
-
C
ss
structural damping coefficient of shear
-
C
v
hydrodynamic damping coefficient
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EI
flexural rigidity
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f
a
force generated by the absorber
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f
ad
damper force of the semiactive absorber
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f
ext
total excitation force
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F
ext
(i)
generalized load vector in segmenti
-
teÎ
the identity matrix
-
J
performance index
-
J
r
rotatory moment of inertia
-
k
a
stiffness coefficient of the absorber
-
K
h
(i)
stiffnes matrices of the segmenti
-
K
s
A
s
G
s
shear rigidity
-
k
v
hydrodynamic spring coefficient
-
l
k
length of the segmentk
-
m
a
mass of the absorber
-
M
ext
total exciting moment
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M
h
(i)
mass matrices of the segmenti
-
m
v
mass moment of inertia
-
w
h
deflection of the center line of the hull
-
W
h
(i)
vertical translation and shear slope of nodes in segmenti
-
¯ w
d
displacement of the absorber mass relative to the hull
-
¯ w
a
absolute displacement of the absorber mass
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¯ w (a, t)
absolute upward displacement of the hull atx=a
-
slope deflection due to bending
-
slope deflection due to shear
-
Dirac delta function
-
k
(i)
Kronecker delta function
-
k
distribution function
-
shape function vector 相似文献
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51800DWT冰区加强型化学品/成品油轮是广船国际自行开发设计的、具有世界先进水平的北极冰区航线成品油/化学品船。该船可满足全球造船业所公认的高等级规范“瑞典-芬兰冰级1Asuper”。本文结合冰区加强结构设计介绍该船的船体结构设计特点。 相似文献
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文章通过对"帕罗斯.勇士"轮成功改装的设计总结,简要介绍了油轮单壳改双壳,船体改装生产设计的工艺过程,并对工艺中可能出现的问题进行了讨论。就船厂而言,如何充分利用工厂自身条件合理制定出既切实可行,又能为船东和船级社所接受的改装设计,有其特别的实际意义。 相似文献
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对"大庆436"油船在单壳改为双壳设计过程中对破舱稳性、装载限制、结构布置和改装工艺等进行了分析研究,并提出了解决方法。通过增加双舷侧等,使该船满足新的规范要求。 相似文献
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A simple formulation for predicting the ultimate strength of ships 总被引:11,自引:0,他引:11
The aim of this study is to derive a simple analytical formula for predicting the ultimate collapse strength of a single- and double-hull ship under a vertical bending moment, and also to characterize the accuracy and applicability for earlier approximate formulations. It is known that a ship hull will reach the overall collapse state if both collapse of the compression flange and yielding of the tension flange occur. Side shells in the vicinity of the compression and the tension flanges will often fail also, but the material around the final neutral axis will remain in the elastic state. Based on this observation, a credible distribution of longitudinal stresses around the hull section at the overall collapse state is assumed, and an explicit analytical equation for calculating the hull ultimate strength is obtained. A comparison between the derived formula and existing expressions is made for largescale box girder models, a one-third-scale frigate hull model, and full-scale ship hulls.List of symbols
A
B
total sectional area of outer bottom
-
A
B
total sectional area of inner bottom
-
A
D
total sectional area of deck
-
A
S
half-sectional area of all sides (including longitudinal bulkheads and inner sides)
-
a
s
sectional area of a longitudinal stiffener with effective plating
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b
breadth of plate between longitudinal stiffeners
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D
hull depth
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D
B
height of double bottom
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E
Young's modulus
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g
neutral axis position above the base line in the sagging condition or below the deck in the hogging condition
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H
depth of hull section in linear elastic state
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I
s
moment of inertia of a longitudinal stiffener with effective plating
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l
length of a longitudinal stiffener between transverse beams
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M
E
elastic bending moment
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M
p
fully plastic bending moment of hull section
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M
u
ultimate bending moment capacity of hull section
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M
uh
,M
us
ultimate bending moment in hogging or sagging conditions
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r
radius of gyration of a longitudinal stiffener with effective plating [=(I
s
/a
s
)1/2]
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t
plate thickness
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Z
elastic section modulus at the compression flange
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Z
B
,Z
D
elastic section modulus at bottom or deck
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slenderness ratio of plate between stiffeners [= (b/t)(y/E)1/2]
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slenderness ratio of a longitudinal stiffener with effective plating [=(l/r)(y/E)1/2]
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y
yield strength of the material
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yB
,
yB
,
yD
yield strength of outer bottom, inner bottom
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yS
deck, or side
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u
ultimate buckling strength of the compression flange
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uB
,
uB
,
uD
ultimate buckling strength of outer bottom
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uS
inner bottom, deck, or side 相似文献
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