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51.
居剑峰 《南通航运职业技术学院学报》2011,10(2):63-66
目前我国内河机动船发展较快,随之而来的污染问题日益突出。文章对内河机动船的大气污染防治现状进行了分析,并从完善监管体系、加强污染防治能力建设、强化船员环保意识、推进新能源使用等方面提出了解决问题的对策。 相似文献
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文中着重对《海轮长江安全航行与避让行为导则》自颁布实施两年来在实际实施过程中产生的利与弊进行探讨,供有关方面人士参考。 相似文献
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从海洋石油工作船挂、解拖的实际作业流程出发,根据海上交通工程系统理论。将作业安全的影响因素划分为人员-船舶-作业环境3大类,采用层次分析法,找出3大类因素中相对主要的因素,得出其对作业安全的影响程度,从而有针对性地为选择安全作业环境、提供安全作业条件、实施安全管理等提供理论参考。 相似文献
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A robust adaptive control strategy was developed to force an underactuated surface vessel to follow a reference path,despite the presence of uncertain parameters and unstructured uncertainties including exogenous disturbances and measurement noise.The reference path can be a curve or a straight line.The proposed controller was designed by using Lyapunov’s direct method and sliding mode control and backstepping techniques.Because the sway axis of the vessel was not directly actuated,two sliding surfaces were introduced,the first one in terms of the surge motion tracking errors and the second one for the yaw motion tracking errors.The adaptive control law guaranteed the uniform ultimate boundedness of the tracking errors.Numerical simulation results were provided to validate the effectiveness of the proposed controller for path following of underactuated surface vessels. 相似文献
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针对金塘大桥所处的特定环境,重点分析了拟建工程附近水域通航现状及船舶交通流量,在初步了解桥区附近水域影响通航的不利因素的基础上,提出几条通航方案供各方参考,并指出对于施工期间通航问题有待深入研究。 相似文献
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Mehmet Sinan Yıldırım Metin Mutlu Aydın Ümit Gökkuş 《Maritime Policy and Management》2020,47(6):833-848
ABSTRACT Solving the berth allocation problem (BAP) in ports is not trivial where the berth resources are limited and various sizes of vessels arrive with dramatically dissimilar loads. Especially in real scenarios, arriving vessels are accepted for a berth with the first come first served (FCFS) priority rule. This study proposes a decision support system coupled with a simulation optimization module based on the swarm-based Artificial Bee Colony optimization algorithm for solving the BAP. The proposed methodology was implemented for the Izmir port in Turkey. To investigate the influences of the vessel priorities on the BAP, four different experimental scenarios based on the single (SQM) and multiple queue models (MQM) were coupled with FCFS and proposed hybrid queue priority (HQP) rule. The results indicated that SQM scenarios were superior to MQM scenarios in a manner of minimizing the average vessel waiting times and the implementation of a dynamic berth allocation strategy for the MQM significantly decreases the vessel waiting times. Results of the SQM also imply that utilization of the HQP approach further minimizes the average vessel waiting times and increases the berth utilization and port throughput without yielding excessive waiting times for the larger vessels compared with the FCFS priority rule. 相似文献
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Distributed model predictive control for vessel train formations of cooperative multi-vessel systems
Recently, the cooperative control of multiple vessels has been gaining increasing attention because of the potential robustness, reliability and efficiency of multi-agent systems. In this paper, we propose the concept of Cooperative Multi-Vessel Systems (CMVSs) consisting of multiple coordinated autonomous vessels. We in particular focus on the so-called Vessel Train Formation (VTF) problem. The VTF problem considers not only cooperative collision avoidance, but also grouping of vessels. An MPC-based approach is proposed for addressing the VTF problem. A centralized and a distributed formulation based on the Alternating Direction of Multipliers Method (ADMM) are investigated. The distributed formulation adopts a single-layer serial iterative architecture, which gains the benefits of reduced communication requirements and robustness against failures. The impacts of information updating sequences and responsibility parameters are discussed. We furthermore analyze the scalability of the proposed method. Simulation experiments of a CMVS navigating from different terminals in the Port of Rotterdam to inland waterways are carried out to illustrate the effectiveness of our method. The proposed method successfully steers the vessels from different origins to form a vessel train. Due to the effective communication, vessels can timely respond to the velocity changes that others make. After the formation is formed, the distances between vessels become constant. The results show the potential to use CMVSs for inland shipping with enhanced safety. 相似文献
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