矿砂船主柴油机扫气管道加装滤器的改造设计

散货码头存在粉尘污染,在矿砂船靠泊作业时,船舶的主柴油机面临粉尘随着空气进入气缸的危险。根据现有船舶柴油机的设计,通过提出在主机进气管道内加装滤器的改造方案,以达到保障船舶主动力设备安全运行的目的。     

基于Workbench的核电双联滤器抗震分析

燃油双联滤器是核电设备中重要的油液净化装置,承担着为反应堆提供洁净燃油的任务。为避免滤器在地震事故中出现安全失效,对其结构强度进行仿真校核是设备开发阶段的一个重要过程。首先分析了滤器的结构特点和工作环境特征,基于此,专门提出一种将动载荷与静载荷组合分析的方法,更加贴切模拟外界冲击对滤器的影响。最后根据核电设备安全设计准则,分别对滤器主体和连接螺栓进行了强度校核,均满足强度要求。该分析方法对类似液压系统与元件的强度分析也具有一定的指导意义。     

燃烧380Cst燃油船舶发电柴油机现状调查与分析

本文主要是对燃烧380Cst燃油各种型号船舶发电柴油机运行管理维护情况进行调查,对调查结果进行详细分析和研究,然后有针对性提出预防危害和故障的措施,使船舶发电柴油机得到有效管理,提高经济效益,确保船舶航行安全。     

油品性能检测和磨粒监测技术在船舶柴油机中的应用研究

船舶柴油机是船舶的心脏,加强船舶的机务管理是保证船舶柴油机处于良好技术状态的关键,而润滑管理是船舶机务管理中的重要内容。近年来,国内外不同行业开展了机械设备在用润滑的分析研究,不少工作是利用分析仪器监测摩擦副的磨损状态,预报潜在故障,为维修工作提供决策信息。事实上,磨损是润滑不良或恶化的结果。如果从在用润滑油性能的衰败分析着手,结合设备磨损工况的监测,探讨油品性能变化与零件磨损的关系,可通过控制油品性能达到防止设备严重磨损的目的。这对于设备现场使用的操作管理,尤其象船舶主机这类离岸工作的设备,具有重要意义和实用价值。 一、试验过程及方法     

船舶柴油机燃油系统的建模与仿真研究

对船舶柴油机燃油系统的建模与仿真研究,能提高船舶柴油机模拟器的仿真精度和逼真度。本文以5250系列装箱船舶的柴油机作为研究对象,首先对柴油机燃油系统原理进行了分析,建立船舶燃油系统的数学模型,采用稀疏矩阵运算方法,开发船舶燃油仿真软件。采用VC++6.0和应用仿真支撑系统PROSIMS进行仿真分析,仿真结果表明,本文采用的稀疏矩阵求解计算复杂管网的方法节省了计算时间,提高了轮机模拟器仿真系统的逼真度和仿真精度,适合实时仿真计算。     

船用柴油机电控高压共轨系统技术特点及管理

阐述了电控共轨柴油机的工作过程和特点,并与传统柴油机在性能和结构上进行了比较,在介绍电控柴油机优点的同时,对当前主流机型SulzerRT-flex和MAN-BWME-C的电控技术进行了对比和分析;探讨了船用柴油机电子喷射燃油系统的运行管理措施,指出电控共轨燃油喷射系统可改善船舶柴油机的经济性、可靠性和排放性,是船用柴油机的发展方向。     

基于带质量块的多悬臂梁船舶主机节能降噪研究

噪声大小一直是衡量船舶性能优劣的重要指标之一,船用柴油机是引起船舶振动与噪声的主要来源,长期工作船上的人员和相关设备会受到振动和噪声带来的危害,船舶主辅机在运行过程中一直存在振动能量的浪费,而压电材料将环境中的振动能转化成电能,这种能量收集方式受到越来越多的关注。鉴于振动问题是船舶领域当中备受关心的问题,而能源问题更是全球关心的问题,因此本文根据船舶柴油机多振源、宽频带、振动类型复杂多样等振动特点,研究设计了一种带质量块的多悬臂梁发电装置,在进行能量收集的同时实现减振降噪。     

大功率船用柴油机主轴承负荷与润滑性能的数值分析

主轴承是柴油机的主要摩擦副之一,其工作时的润滑状态直接影响船舶柴油机整机的工作性能。特别是在大功率低中速船用柴油机中,主轴承连续工作时间更长,负荷更大,工况更加恶劣,难以形成良好的动压润滑。因此,论文以9缸G32大功率船用柴油机为例,对各段主轴承的轴承载荷,轴心轨迹,最小油膜厚度进行了计算分析,为判断各道主轴承的润滑情况,精确预测轴承性能,以及判断轴系是否存在异常工作情况提供了依据。     

浅析柴油机高压油泵柱塞副咬死故障

柴油机是工业上常用的动力来源,常见汽车、船舶等交通工具均需要柴油机为其提供动力。柴油机性能的好坏直接关系到这些的设备性能,高压油泵作为柴油机燃油系统的关键零部件,对其进行研究有着重要的意义。高压油泵柱塞件的"咬死"问题是高压油泵中常见的故障问题,造成柱塞件"咬死"现象的原因是多方面的,文章中针对柱塞件"咬死"问题的机理进行了分析,从产品质量管理、零件装配、燃油管理等多方面给出了有效的预防措施,对于研究人员和工程技术人员降低柱塞副"咬死"故障的发生有一定的意义。     

燃烧380Cst燃油船舶发电柴油机的维护管理与应用研究

对各种型号燃烧380cst燃油船舶发电柴油机运行管理情况进行调查分析,对调查结果进行详细分析和研究,然后有针对性提出预防危害和故障的措施,使柴油机得到有效管理,提高经济效益,确保船舶航行安全。     

船舶节能新技术开发与应用研究

随着船舶燃油价格的上涨,船舶节能技术得到了广泛的关注,本文主要介绍了国内外船舶节能新技术的研究和进展.本文重点介绍了主机动力系统、制冷系统、推进系统和油料系统等的综合节能技术措施.再借助管理系统的帮助,将能为国内的船舶节能的发展提供有利的推动.     

Effects of a turbocharger cut out system on vibration characteristics of a propulsion shafting system and a large low speed marine diesel engine

To cope with the long term recession in the shipping industry due to oversupply of ships and high oil prices and due to reinforcement of environmental regulations to reduce greenhouse gas emission from ships, large container vessels built recently have ultra-long stroke engines with high propulsion efficiency. For these, de-rated engine and tuning technologies are used to reduce fuel oil consumption. However, previously built vessels were optimized for high ship speed. In these case, lowering ship speed to reduce ship operating cost does not provide similar benefits. Therefore, engine manufacturers have developed a turbocharger cut-out system to reduce fuel oil consumption at low speed. This has the advantage of reducing fuel consumption at low speeds, but also has the characteristic of producing higher torsional exciting force than is typical in existing engines for low load ranges. In this paper, the performance and dynamic characteristics of a marine diesel engine were reviewed after applying a turbocharger cut-out system. Then the effects on the engine body vibration and the torsional vibration were examined for a corresponding propulsion shafting system in a Panamax container-vessel equipped with a turbocharger cut-out system optimized for slow steaming. As a result, the torsional vibratory stress in shafts was increased. This had a larger effect on the X-mode shape of the engine body vibration and on the upper structure vibration, when one of three turbochargers was cut out.     

An algorithm for robust noninteracting control of ship propulsion system

In this paper, a new algorithm for noninteracting control system design is proposed and applied to ship propulsion system control. For example, if a ship diesel engine is operated by consolidated control with controllable pitch propeller (CPP), the minimum fuel consumption is achieved satisfying the demanded ship speed. For this, it is necessary that the ship is operated on the ideal operating line which satisfies the minimum fuel consumption, and the both pitch angle of CPP and throttle valve angle are controlled simultaneously. In this context of view, this paper gives a controller design method for a ship propulsion system with CPP based on noninteracting control theory. Where, linear matrix inequality (LMI) approach is introduced for the control system design to satisfy the givenH _∞ constraint in the presence of physical parameter perturbation and disturbance input. To the end, the validity and applicability of this approach are illustrated by the simulation in the all operating ranges.     

某型柴油机拉缸故障原因分析与处理

对某型船用主柴油机在修后航行试验过程中出现的拉缸故障停车现象,进行了原因分析和故障排除,恢复了舰船动力设备的性能,保证了修理工程的顺利进行.     

微粒捕集器对柴油机性能影响的研究

柴油机排气微粒捕集技术是实现柴油机微粒排放控制的一个非常有效的技术，然而，微粒捕集器也会对柴油机的性能产生一定的影响。通过大量的柴油机台架试验，研究了微粒捕集器对ＹＣ６１０８柴油机的动力性、燃油经济性以及排放性能的影响，研究结果可以为微粒捕集器的正确使用及再生控制策略的确定提供依据。     

工程机械用柴油机的动力匹配技术

柴油机广泛装备于工程机械设备,其动力匹配主要由散热系统、进排气系统和燃油系统等部分组成。正确的匹配选型和合理的布置对柴油机乃至整个设备的高效运行都至关重要。当然,设备使用的过程中,及时规范的保养也非常重要。     

Novel Ship Propulsion System

As the development tends towards high-speed, large-scale and high-power, power of the ship main engine becomes larger and larger. This make the engine design and cabin arrangement become more and more difficult. Ship maneuverability becomes bad. A new ship propulsion system, integrated hydraulic propulsion (IHP), is put forward to meet the development of modem ship. Principle of IHP system is discussed. Working condition matching characteristic of IHP ship is studied based on its matching characteristic charts. According to their propulsion principle, dynamic mathematic models of IHP ship and direct propulsion (DP) ship are developed. These two models are verified by test sailing and test stand data. Based on the software Matlab/Simulink, comparison research between IHP ship and DP ship is conducted. The results show that cabin arrangement of IHP ship is very flexible, working condition matching characteristic of IHP ship is good, the ratio of power to weight of IHP ship is larger than DP ship, and maneuverability is excellent. IHP system is suitable for engineering ship, superpower ship and warship, etc.     

船用柴油机关键件铣削加工参数优化的研究

柴油机是船舶的核心设备,提高柴油机的加工制造水平是提升柴油机性能和增强我国船舶竞争力的重要筹码。针对船用柴油机制造企业重设备、轻工艺、低效率、高消耗的现况,通过对金属切削加工理论的研究,建立了船用柴油机关键件铣削加工过程中的单目标及多目标参数优化的数学模型,运用惩罚函数法在机床性能约束限制的可行域内进行求解,并运用有限元切削仿真软件Deform对优化结果进行切削仿真,与经验切削参数的仿真结果进行了对比。     

Performance and emission studies on an agriculture engine on neat Jatropha oil

Diesel engines have proven their utility in the transportation, agriculture, and power sectors in India. They are also potential sources of decentralized energy generation for rural electrification. Concerns on the long-term availability of petroleum diesel and the stringent environmental norms have mandated the search for a renewable alternative to diesel fuel to address these problems. Vegetable oils have been considered good alternatives to diesel in the past couple of years. However, there are many issues related to the use of vegetable oils in diesel engine. Jatropha curcas has been promoted in India as a sustainable substitute to diesel fuel. This study aims to develop a dual fuel engine test rig for evaluating the potential suitability of Jatropha oil as diesel fuel and for determining the performance and emission characteristics of an engine with Jatropha oil. The experimental results suggest that engine performance using Jatropha oil is slightly inferior to that of diesel fuel. The thermal efficiency of the engine was lower, while the brake-specific fuel consumption was higher with Jatropha oil compared with diesel fuel. The levels of nitrogen oxides (NOx) from Jatropha oil during the entire duration of the experiment were lower than those of diesel fuel. The reduction of NOx was found to be an important characteristic of Jatropha oil as NOx emission is the most harmful gaseous emission from engines; as such, its reduction is always the goal of engine researchers and makers. During the entire experiment, carbon monoxide (CO), hydrocarbon (HC), and carbon dioxide (CO₂) emissions in the case of using Jatropha oil were higher than when diesel fuel was used. The higher density and viscosity of Jatropha oil causes lower thermal efficiency and higher brakespecific fuel consumption. The performance and emission characteristics found in this study are significant for the study of replacing diesel fuel from fossils with Jatropha oil in rural India, where the availability of diesel has always been a problem.     

油田水泥车B2-300柴油机的技术改造

阐述了百色石油勘探公司改造进口设备—— B2 - 30 0型柴油机的技术措施 ,有效地解决了“三漏一排”、性能下降、故障频繁等严重影响油田正常生产的难题 ;同时改善了工作环境、减轻了工人劳动强度 ,油料消耗和设备维护保养费用亦大大降低 ,并为企业节约大笔设备更新投资。