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基于主成分分析的振动噪声源耦合信息判别 总被引:1,自引:1,他引:0
主成分是通过把原来多个变量转化为少数几个互不相关的主成分的一种统计方法,最终达到数据化简、揭示变量间的关系和进行数据解释的目的.通过实船航行试验,证明了主成分分析可以在信息损失较少的前提下提取振动噪声源之间存在的耦合信息. 相似文献
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对重庆内环高速公路的整体状况进行研究,从事故相对指标统计和绝对指标统计以及事故特征分析重庆内环高速公路的安全状况,并从人、车、路、环境等方面的因素对事故原因进行分析并提出针对性的对策。 相似文献
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从量化的角度分析了房地产价格的变化以及各地的价格影响因素。对收集到的全国31个省、市的房地产指标数据用主成分分析法分析,得出影响房地产价格的综合指标,并将各地的房地产价格做出排序。本文还将主成分分析用于系统评估且对分析方法进行改进。 相似文献
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《舰船科学技术》2015,(8):45-51
根据多个技术和经济指标进行船舶主尺度优化论证是船舶设计人员需要着重解决的问题。提出结合粒子群优化和主成分聚类两阶段的方法进行船舶主尺度论证分析。建立了以载重量、建造费用、服务航速和提供舱容为设计指标的水面船主尺度论证模型。采用多目标粒子群优化算法对船舶优化模型进行求解,获得问题的Pareto解集。使用主成分聚类分析对该数据集进行综合评价。先将Pareto解集进行主成分分析,使用前2个主成分就能够表达原始数据的绝大部分信息,再通过对主成分进行聚类,获得不同类别中Pareto解集的特征,根据第一主成分得分获得每个聚类中设计样本的排序,最终可以从Pareto解集中得到折中解。利用主成分分析和聚类技术还研究了变量在主平面上的映射以及聚类特性。给出了1艘水面船的主尺度论证算例,表明本文给出的方法合理可行。 相似文献
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通过对大连港1991~2001年渔船与商船事故的统计,从事故等级、能见度、发生时间、地点、船舶等5个方面进行分析,总结出人的因素是导致事故发生的主要原因。故从严进行船员培训、提高船员素质、加强对船员的责任心教育、有效实施对船员的管理,是降低事故发生率、使航行更安全的有效途径。 相似文献
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2012年8月,广东海事局辖区发生列入统计范围的一般等级以上的水上交通事故1宗(一般事故),死亡失踪0人,沉船0艘,直接经济损失0万元。事故四项指标环比三降一平,事故数、沉船数和直接经济损失分别下降75%、100%和100%,死亡失踪人数持平;事故四项指标同比全面下降,分别下降83.3%、100%、 相似文献
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以控制船舶机舱事故为目的,以E·F船机舱事故为对象,采取对主要事故进行分析及1年事故数据调查统计的方法,分析在机舱安全事故中,严重伤害、轻微伤害和没有伤害之间的比例关系,探讨事故发生频率与伤害严重程度之间的普遍规律,提出降低机舱安全事故的策略。 相似文献
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The aim of this paper is to investigate maritime safety from an occupational hazards perspective as opposed to a maritime
casualty perspective. It is recognised that safety in shipping should encompass casualties arising from accidents occurring
in the course of performing normal seafaring duties, not just those arising from technical defects or maritime disasters.
The paper discusses an investigation involving a survey of 19 flag states and two detailed studies of records kept at the
Hong Kong and Singapore maritime administrations. The results indicate that occupational accidents account for a significant
proportion of fatalities at sea. The statistics presented specify the ship types that are most at risk, as well as the types
of occupational hazards that can most frequently lead to accidents and fatalities. The results of this study indicate voids
in the process of investigating fatalities that relate to occupational accidents. These results also indicate inadequate investigation
of events and causes. The creation of a database of such information could potentially be used for the development of appropriate
regulations that could prevent fatal and non-fatal occupational accidents through regulatory processes. 相似文献
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近年来,国内液化气船恶性事故接连不断,已严重危害液化气海上运输事业的健康发展。而要遏止这种趋势,必须准确分析事故频发的根源,并采取有力措施。 相似文献
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海上船舶碰撞事故原因探讨——侥幸心理的剖析 总被引:1,自引:0,他引:1
引起事故的原因有很多,如设备的因素、环境的因素、人的因素等,其中人的因素除了生理因素,还有心理因素,而心理因素则往往是造成事故的主要原因.人的行为是受其心理状态支配的,事故发生前人的心理状态是复杂多样的,其中侥幸心理侥幸心理是引发事故的普遍原因.通过几起典型的船舶碰撞事故案例,对船舶驾驶人员的侥幸心理进行了剖析,引导人们要培育积极的心理状态,以减少人为差错而导致的船舶碰撞事故. 相似文献
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承运原木的多用途杂货船,近年来连续发生沉船事故,事故的发生已不是孤立的一件事故,而是有着内在联系的一类事故。事故的发生有外在的恶劣气象海况原因,更有船舶本身的原因。有货物的原因,更有装载的原因。有装卸的原因,更有船舶结构的原因。总之,事故的发生不是偶然的,而是长期生产营运中船舶疲劳过度的必然结果。 相似文献
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About 63% of the world’s shipping accidents are recurrent—they occur to ships that have already experienced at least one prior accident. Therefore, reducing recurrent accidents can contribute significantly to maritime safety. We study the factors affecting both first and recurrent accidents, by focusing on the duration between two accidents. Cox proportional hazard models are applied to ship accident data from 1996 to 2015, and the results identify which ships have a high risk of recurrent accidents, based on ship attributes, ship supply and market conditions, shipbuilding country, previous accident type, and ship type. The recurrent rate is high when the ship involved in the accident is old, small, flies a flag of convenience, and has no detention record. In addition, the accident risk increases when the shipping market faces a high bunker price, overcapacity in supply, a high time charter rate, or low newbuilding price. On the other hand, ships built in China and Japan have lower recurrent accident rates than those built elsewhere, although ships built in China have earlier first accidents than do others. General cargo ships have the highest recurrent accident rate, followed by dry bulkers, container ships, and tankers, in that order. 相似文献
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The increase in the world's trading capacity, which has been spurred by globalization, has caused problems in marine transportation, namely congestion. Despite the safety measures currently in place, marine accidents are still not being prevented. This study focuses on marine accidents in the Turkish Straits that have done serious harm to humans, the natural environment, and the economy. To reduce the negative impacts mentioned above, this study considered the most common types of accidents, their causes, and their results. For this purpose, 850 serious marine accidents, which took place in the Turkish Straits between the years of 2001 and 2010 (as recorded by the Undersecretaries for Maritime Affairs), have been analyzed and the data obtained have been systematically tabulated using analytic hierarchy process (AHP) methodology. According to the data, the most significant cause of marine accidents in the Turkish Straits is human error. This study proposes measures to ensure that ship personnel are competent, mentally and physically, to navigate narrow and dangerous waterways in order to minimize the amount of accidents caused by human error. 相似文献
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为了防止和减少发生内河交通事故,必须认真查找与治理事故隐患,通过研究,应重点抓好三个方面的工作,从而达到防止和减少事故发生的目的。 相似文献