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Assessment of Maneuverability in Waves

机译：波浪中的可操纵性评估

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摘要

Maneuverability of ships is presently standardized (normed) by rules of classification societies, shipowner requirements, and International Maritime Organization (IMO) standards for ship maneuverability. The latter address turning, initial turning, yaw checking, course keeping, and emergency stopping abilities, evaluated in simple standard maneuvers in calmwater, and have practically become an industry standard. However, these standards do not address ship maneuverability in adverse weather conditions; after the introduction of the energy efficiency design index (EEDI), the importance of this issue increased because of concerns that propulsion and steering abilities of ships may become insufficient if EEDI requirements are achieved by simply reducing the installed power. To provide a rational basis for the standardization of maneuverability of ships in adverse weather conditions, relevant criteria, measures, and standards need to be developed, as well as efficient ways to evaluate the criteria in practical design and approval, keeping in mind that, on the one hand, maneuvering in waves is a difficult hydrodynamic problem, presently tackled in research projects in few centers worldwide, and, on the other hand, simple practical regulations are urgently required to be routinely used in design and approval of all new-built ships as a part of EEDI requirements. Obviously, this contradiction requires significant simplifications. The aim of this studywas to outline possible approaches to practical assessment, based on a sequence of pragmatic simplifications and leading to practical assessment procedures of various complexity (some of which are implemented in the presently acting 2013 Interim Guidelines for determining minimum propulsion power to maintain themaneuverability of ships in adverse conditions, and in other proposals), validate the proposed simplifications, and summarize remaining difficulties.
机译：目前，船级社的规则，船东要求和国际海事组织（IMO）的船舶操纵性标准对船舶的操纵性进行了标准化（标准化）。后者解决了转弯，初始转弯，偏航检查，航向保持和紧急停车的能力，通过在平静水中进行简单的标准操作进行评估，并且实际上已成为行业标准。但是，这些标准并未解决恶劣天气条件下的船舶操纵性。在引入能效设计指数（EEDI）之后，由于担心如果仅通过减少装机功率即可达到EEDI要求，船舶的推进和操纵能力可能会不足，因此此问题的重要性增加。为了为在恶劣天气条件下船舶的操纵性标准化提供合理的基础，需要制定相关的标准，措施和标准，以及在实际设计和批准中评估标准的有效方法，同时要牢记一方面，海浪操纵是一个棘手的水动力问题，目前在全球少数几个中心的研究项目中得到解决，另一方面，迫切需要在所有新造船的设计和批准中常规使用简单的实用法规作为EEDI要求的一部分。显然，这种矛盾需要大大简化。这项研究的目的是基于一系列务实的简化并导致各种复杂性的实践评估程序，概述可行的实践评估方法（其中一些在现行的《 2013年临时指南》中实施，用于确定维持可操作性的最低推进力）对处于不利条件下的船舶以及其他提议中的船舶）进行验证，以简化提议的简化过程，并总结剩余的困难。

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