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1.
In order to make significant progress in design and manufacturing systems, all industries must consider integration. This
paper considers information models and functions for a computer integrated design and manufacturing system in shipbuilding.
The authors propose the product model and several alterative functions for designing a ship's structure, and develop a “ship
definition system for computer integrated design and manufacturing.” This system is called SODAS (System of Design and Assembly
for Shipbuilding). An object-oriented concept is used to develop this system. In order to define a ship's structure, the authors
propose the product models of “parts member” and “parts connection,” and the product models of “Room,” “Unit,” and “Module”
are introduced to define the compartments, internal structures and intermediate products of a ship. Therefore, all information
about a product from the design to the production stage is stored in the product model. As well as the product model, the
“design function,” “cutting function,” and “virtual assembling function” are introduced. By using the design function, any
type of ship's structure can be designed, and by using the cutting function, the design of a ship's structure can be cut into
smaller elements. By using the virtual assembling function, a simulation of the manufacture of a ship's structure can be carried
out. 相似文献
2.
The employment and management policies of the shipping industry are in legal and administrative confusion. The shipping industry
is struggling with an unworkable global governance based on flag state sovereignty and a sanctionless international regulatory
regime. Seafarers suffer most from this state of affairs, but so do the shipping industry’s public image. Few co-operatives
of maritime workers exist in national or international shipping. A new employment theory is long overdue. Human centred management
policies can only attain their full potential through co-operative or mutual associations. This paper describes the application
of enlightened and socially conscious management principles to the shipping industry. Seafarers’ co-operatives are the future
organisational building blocks of the shipping industry. Co-operatives can rescue maritime workers from developing countries
from exploitation and the debilitating effects of casual labour by providing “all in one” seagoing and shore based professional
careers. Seafarers’ co-operatives can solve the shipping industry’s maritime training and education problems. The seven universal
principles of co-operative management will guide shipping management in setting human centred objectives that command respect
of those who come in contact with the shipping industry. 相似文献
3.
David G. Blair 《Journal of Marine Science and Technology》2006,11(2):123-130
In underwater acoustic imaging, which is used to produce high-quality images in turbid waters, a specular reflector can produce
a “pseudoimage” of the receiving array at the reflecting surface. Based on the “geometrical approximation” (which is similar
to geometrical acoustics), formulae are derived for the size and shape of the pseudoimage for both flat and curved reflectors.
For curved reflectors, described by two principal radii of curvature, the formulae also assume the “large-range approximation.”
The formulae allow radii of curvature to be determined from an image. Also discussed briefly are some possible extensions
and the role of nongeometrical effects. 相似文献
4.
Heike Hoppe 《WMU Journal of Maritime Affairs》2005,4(2):169-180
The development of goal-based new ship construction standards is a new subject matter of high importance for IMO which has
been included in the Organization’s strategic and long-term work plans and also in the work programme of its Maritime Safety
Committee. This paper briefly describes the meaning of “goal-based” regulation in general and looks at its application to
ship construction. The on-going work at IMO is presented, results achieved to date are explained and an outlook is given regarding
the work still to be carried out. 相似文献
5.
YOU Guang-xin PANG Yong-jie JIANG Da-peng 《船舶与海洋工程学报》2005,4(2):7-12
A“Market” based framework for multiple AUVs team is introduced in this paper. It is a distributed meta-level task allocation framwork. The formulation and the basic concepts of the “Market” such as “goods” and “price” are discussed first, then the basic algorithm of the “auction”. The loosely coupled v-MDTSP tasks are considered as an example of the task allocation mission. A multiple AUV team controller and a detailed algorithm are developed for such applications. The simulation results show that the controller has the advantages such as robustness and low complexity and it can achieve better optimization results than the classical central controller ( such as GA) in some tasks. And the comparison of two different local solvers also implies that we should get the reasonable task allocation even not using the high quality algorithm, which can considerably decrease the cooperation computation. 相似文献
6.
Noor Apandi Osnin 《WMU Journal of Maritime Affairs》2006,5(2):195-206
Recently, maritime security issues in the Strait of Malacca have been in the limelight. Statistics highlighting the risk of
piracy faced by shipping in the Strait of Malacca and the possibility of a terrorist attack have led to an enhanced awareness
of the need for heightened security. The declaration by Lloyd’s Joint War Committee (JWC) of the Strait as a “war risk area”
has strengthened the perception that the littoral states have not done enough to make the Strait secure for international
trade. 相似文献
7.
Bevan Marten 《WMU Journal of Maritime Affairs》2011,10(1):45-61
This article discusses the enforcement of shipping standards, with a particular focus on Part XII of UNCLOS. Section 6 of
Part XII contains the only comprehensive set of vessel-related enforcement provisions in the Convention, but the Part’s scope
is limited to “the preservation and protection of the marine environment.” Therefore, not all shipping standards fall clearly
within Part XII’s ambit, including those centered on safety, security, and crewing considerations. The enforcement provisions
of Section 6 are favorable to flag states and their vessels, and Section 7 contains a number of safeguards for their benefit,
so it is in the interests of these parties to have coastal state enforcement governed by Part XII. However, the ability of
coastal states to establish and enforce shipping standards that apply within the territorial sea extends to more than just
environmental matters. The result is that different standards give rise to different enforcement powers, depending on the
maritime zone in which a vessel is located, even if those standards arise from the same international agreement. It is suggested
that to remedy these problems, UNCLOS would need to be amended in order to provide a comprehensive enforcement regime for
the enforcement of shipping standards. 相似文献
8.
This study asses the effectiveness of classroom-based bridge resource management (BRM) training for junior naval officers, in which general principles of human behaviour and performance in teams and under stress were conveyed. Although BRM training is recommended by the International Maritime Organization and is increasingly common in seafaring, very little is known about whether the adaptation of crew resource management (CRM) training from aviation to the maritime domain has been successful and what type of training is effective. A study with a quasi-experimental, two-factorial mixed design was conducted with BRM training as the between factor and time as the within factor. For 117 study participants, evaluation criteria were assessed on all levels as defined by Kirkpatrick (Train Dev J, 178–192 1979): subjective training evaluation, knowledge, attitudes and behaviour as well as performance while commanding a vessel during a real-world exercise. BRM participants showed better subjective training evaluations and more BRM-related knowledge than controls. Training did not produce differences between groups regarding BRM-related attitudes, the demonstration of non-technical skills or the overall success in the real-world exercise. Overall, BRM training effectiveness was rather low, which can most probably be attributed to the focus of training on generalizable knowledge, skills and attitudes at the expense of their specific application to the context of the real-world exercise. In the design of BRM and CRM training courses alike, the effective application of general principles to a given context must be defined, and the application must be emphasised during training delivery. 相似文献
9.
Parametric rolling in irregular head seas is investigated using numerical simulation in the time domain in this paper. The
effect of the change in speed due to added resistance on parametric rolling is taken into account. Three methods of calculating
the added resistance in irregular head seas are applied to this problem, and then Pinkster’s method, which considers the time-varying
added resistance in irregular head seas, is extended for further investigations in this paper. Furthermore, the Froude–Krylov
component of restoring variation is estimated with coupling from heave and pitch motions, and the hydrodynamic effects are
extrapolated nonlinearly with regards to roll angle. Finally, the “practical non-ergodicity” of parametric roll is investigated
with a model experiment at zero forward speed and using the simulation, and the effect of added resistance is investigated
with the simulation. 相似文献
10.
Paul Musili Wambua 《WMU Journal of Maritime Affairs》2012,11(1):95-113
Since 2008 Kenya has distinguished itself in the global war against piracy by undertaking prosecutions in the national courts
of suspected pirates arrested in the high seas and handed over by navies of leading maritime nations under bilateral agreements
(MOUs) entered into between Kenya and these leading maritime nations. As of July 2011, Kenya had over 20 convicted pirates
serving jail terms ranging between 7 and 20 years and over 100 suspected pirates awaiting trial in national courts. This is
the largest number of suspected pirates held and tried in any one state at any given time in modern history. To achieve this,
Kenya had to effect far reaching changes in the law. In the initial stages, suspected pirates were charged under Kenya’s Penal
Code (Cap 63 Laws of Kenya). However, the high court in the case of Re Mohamud Mohamed Dashi and eight others [2010] eKLR,
ruled that Kenya had no jurisdiction to try suspected pirates under that law. In September 2009, Kenya passed a new law (the
Merchant Shipping Act), which not only defined more comprehensively and extensively the offence of piracy, but also extended
the jurisdiction of Kenyan courts to try piracy committed by non-nationals. Though the law gives Kenya a very broad jurisdiction
to try suspected pirates, the process is still fraught with challenges due to lack of financial and human resources. In the
case of Republic vs Hassan Jama Haleys Alias Hassan Jamal and five others [2010] eKLR, the court commented thus:
“… I must note that the ‘piracy trials’ have presented a unique challenge to the Kenyan legal system. We cannot ignore the fact that these are suspects who having been arrested by foreign naval forces on the High Seas are brought to Kenya for trial. They are strangers in the country, do not understand the legal system, may not know what their rights are and do not understand the language… the Kenyan Government and the International partners supporting these trials put in place a system to provide free legal representation for the suspects…” 相似文献
11.
L. P. Perera J. P. Carvalho C. Guedes Soares 《Journal of Marine Science and Technology》2011,16(1):84-99
This paper focuses on a fuzzy logic based intelligent decision making system that aims to improve the safety of marine vessels
by avoiding collision situations. It can be implemented in a decision support system of an oceangoing vessel or included in
the process of autonomous ocean navigation. Although Autonomous Guidance and Navigation (AGN) is meant to be an important
part of future ocean navigation due to the associated cost reduction and improved maritime safety, intelligent decision making
capabilities should be an integrated part of the future AGN system in order to improve autonomous ocean navigational facilities.
In this study, the collision avoidance of the Target vessel with respect to the vessel domain of the Own vessel has been analyzed
and input, and output fuzzy membership functions have been derived. The if–then rule based decision making process and the
integrated novel fuzzy inference system are formulated and implemented on the MATLAB software platform. Simulation results
are presented regarding several critical collision conditions where the Target vessel fails to take appropriate actions, as
the “Give way” vessel to avoid collision situations. In these situations, the Own vessel is able to take critical actions
to avoid collisions, even when being the “Stand on” vessel. Furthermore, all decision rules are formulated in accordance with
the International Maritime Organization Convention on the International Regulations for Preventing Collisions at Sea (COLREGs),
1972, to avoid conflicts that might occur during ocean navigation. 相似文献
12.
13.
Ioannis K. Chatjigeorgiou Spyros A. Mavrakos 《Journal of Marine Science and Technology》2007,12(4):218-231
This work considers the second-order sum-frequency diffraction problem for a stationary truncated surface-piercing circular
cylinder in bichromatic waves. The solution method was based on a semianalytical formulation of the second-order sum-frequency
diffraction potential. The boundary conditions were properly satisfied by introducing the “locked” and the “free” wave components
of the nonlinear velocity potential. The method was validated by comparing the calculated results with numerical data previously
reported by other authors. Particular attention was paid to the second-order sum-frequency heave forces and the change in
the wave run-up configuration due to the existence of the lower fluid domain underneath the truncated cylinder. 相似文献
14.
Yusuke Yano Shinichi Takagawa Kazuyasu Wada 《Journal of Marine Science and Technology》2003,7(3):101-108
The Japan Marine Science and Technology Center (JAMSTEC) has been, and is now promoting the “OD21” program (i.e., “Ocean
drilling in the 21st century”). This is the first plan in the world to utilize deep-water riser-drilling technologies for
scientific drilling. One of the important factors for the success of this program is the development of a high-performance
drilling vessel. Since 1990, JAMSTEC has been continuing a technological study of a riser-drilling vessel for scientific studies
with an operational capability in waters up to 4000 m deep. It was decided to start the construction with a two-phase plan:
a vessel with a riser operation for waters up to 2500 m deep will be constructed in the initial stage, and then the vessel
will be modified to a 4000-m depth capability. In the development process of the vessel, named Chikyu, many new technical developments have taken place, such as drilling/coring equipment, a dynamic positioning system, etc.
Thus, the Chikyu is expected to contribute to ocean engineering and other work, in addition to scientific advances.
Received: June 15, 2002 / Accepted: November 11, 2002
Address correspondence to: Y. Yano (e-mail: yanoy@jamstec.go.jp) 相似文献
15.
Kunihiro Hamada Yukio Fujimoto Eiji Shintaku 《Journal of Marine Science and Technology》2002,6(4):205-215
Recently, the significance of ship inspections has been increasingly recognized because sea pollution and safety problems
are occurring more and more frequently. However, current ship inspections rely on the experience of the workers. Therefore,
it is difficult to understand, and hence to improve, the state of ship inspections. In this paper, ship inspection is directed
into three stages (plan, do, and check), and the configurations of a total system to support ship inspections are discussed.
A prototype system for the “plan” and “do” stages is developed. This is realized by organizing the information that relates
to inspection, and defining data models for damage and inspection states. Then the proposed system is integrated with a shipbuilding
computer integrated manufacturing (CIM) system so that the ship's structural information can be used effectively. In addition,
functions to calculate the damage-finding probability, and functions to generate information about damage and the inspection
state are introduced. Therefore, in the planning stage, as inspector can execute a virtual ship inspection, and then the damage-finding
probability of each hull part and oversight areas are calculated automatically. Further, by carrying this system into an inspection,
an inspector can generate damage information and inspection information simply and easily. Some examples of the proposed system
are shown at the end of the paper.
Received: November 12, 2001 / Accepted: January 30, 2002 相似文献
16.
PANG Yong-jie YOU Guang-xin 《船舶与海洋工程学报》2005,4(4):1-6
Oceanographic survey, or other similar applications should be the applications of multiple AUVs. In this paper, the skill & simulation based hybrid control architecture (S^2BHCA) as the controller's design reference was proposed. It is a multi-robot cooperation oriented intelligent control architecture based on hybrid ideas. The S^2BHCA attempts to incorporate the virtues of the reactive controller and of the deliberative controller by introducing the concept of the "skill". The additional online task simulation ability for cooperation is supported, too. As an application, a multiple AUV control system was developed with three "skills" for the MCM mission including two different cooperative tasks. The simulation and the sea trials show that simple task expression, fast reaction and better cooperation support can be achieved by realizing the AUV controller based on the S^2BHCA. 相似文献
17.
An innovative complexity metric is introduced that provides a way to compare similar or different ship types and sizes at
the contract design stage. The goal is to provide the designer with this information throughout the design process so that
an efficient design is obtained during the first design run. Application to and validation on real passenger ships indicate
that there is a significant correlation between the error in an engineer’s judgement of complexity and the cost assessment
error. It follows that this tool could be used to improve knowledge of the ship’s complexity at the contract design stage,
and even to try to optimise the design if the complexity criteria are not fixed by the shipowners. 相似文献
18.
Vishwanath Nagarajan Dong-Hoon Kang Kazuhiko Hasegawa Kenjiro Nabeshima Toshihiko Arii 《Journal of Marine Science and Technology》2009,14(3):296-309
The influence of a rudder’s axial force on the prediction of full-scale powering performance of a ship is investigated in
this paper. Axial force characteristics of different rudder types were investigated by open water experiments. Viscous scale
effects on the rudder’s axial force were investigated by carrying out open water experiments with different sizes of rudder.
Experiments were carried out in the towing tank for a model ship fitted with different rudder systems to investigate the influence
of rudder’s axial force on full-scale propulsion performance prediction. Based on the experiment results, a new prediction
method is proposed for estimating full-scale power that considers scale effect on rudder’s axial force. Good performance of
the proposed prediction method is demonstrated by estimating the engine power of a ship installed with a special high lift
twin-rudder system from model experiments and comparing it with the values measured on the ship during full-scale experiments. 相似文献
19.
Athanasios A. Pallis 《WMU Journal of Maritime Affairs》2007,6(1):3-20
Throughout Europe, a number of maritime interests have re-targeted their lobbying structures and strategies aiming to influence
the development of the maritime related European Union (EU) policies. The paper examines these maritime interests’ mobilisation
in the making of the Common EU Maritime Transport Policy (CMTP). First, it provides a review of the role of these interest
groups and the implications of the observed collective interests’ representation. Then, with the contribution a data-set of
replies to a questionnaire distributed to all the interest groups that are involved in EU maritime affairs, the paper analyses
the variety of interest groups representing the maritime sector in EU affairs. The focus is on the structures (i.e. membership
numbers and types, location, internal structures, budget) and the lobbying practices of the 37 identified EU level maritime
related organisations. The paper also presents an evaluation of the most positive and most negative parameters of the ‘EU
environment’ and the ‘economic environment’ that assist, or undermine, the governability cohesiveness of this collective action.
This study provides information on whether and under what conditions maritime interests are able to form comprehensive EU-level
organisations capable of representing their members and their interests in the EU policy making process 相似文献
20.
Uwe K. Jenisch 《WMU Journal of Maritime Affairs》2004,3(1):67-83
The purpose of this paper is to summarize the European maritime transport policy within the context of maritime politics at
large. At the outset the legal framework conditions and supportive instruments for the shipping and port industries are presented.
Against the background of recent accidents at sea, such as the sinking of ERIKA and PRESTIGE, the EU legislation on maritime
safety is of particular interest as it is both complex and rapid in reaction to environmental needs and political pressure.
Finally, the sensible relationship between the EU as a regional organization and the IMO as “the competent international organization”
is discussed with a view to reconcile possible rivalry and to suggest a complementary cooperation between the two organizations. 相似文献