柴油机故障诊断专家系统知识库设计

在分析柴油机故障诊断知识特点的基础上,采用模糊化方法对柴油机运行状态参数进行处理,采用综合型知识方式来表达柴油机故障诊断知识,采用多库多层次的方式组织知识库,并对知识库采取一系列方式进行管理与维护。应用表明,柴油机故障诊断专家系统的预报准确率较高,具有较强的实用性。     

YC6A220C柴油机排气余热裂解甲醇助燃的试验研究

在不改变YC6A220C柴油机结构和参数的基础上,从排气管道引出高温尾气裂解甲醇气进入柴油机进气管进行混合燃烧,研究了共轨燃烧甲醇裂解气时YC6A220C柴油机的燃烧排放特性.结果表明,与原机相比,燃用预混裂解气的发动机动力性基本无变化,经济性有所提高,在掺烧比为1.5%～6%时,各种负荷下节油可达4%～8%;在高负荷时,NOx排放可降低32.4%,碳烟排放可降低41.6%,HC排放也有明显降低.     

基于条件的近岸风能维修策略综述（英文）

The existing maintenance strategies of offshore wind energy are reviewed including the specific aspects of condition-based maintenance, focusing on three primary phases, namely, condition monitoring, fault diagnosis and prognosis, and maintenance optimization. Relevant academic research and industrial applications are identified and summarized. The state of art, capabilities,and constraints of condition-based maintenance are analyzed. The presented research demonstrates that the intelligent-based approach has become a promising solution for condition recognition, and an integrated data platform for offshore wind farms is significant to optimize the maintenance activities.     

Review of Condition-Based Maintenance Strategies for Offshore Wind Energy

Journal of Marine Science and Application - The existing maintenance strategies of offshore wind energy are reviewed including the specific aspects of condition-based maintenance, focusing on three...     

春风塔河A级优质道路石油沥青及沥青混合料性能研究

本文首先从沥青常规指标、PG分级、红外光谱、四组分对比评价了春风塔河A级优质道路沥青与疆内外沥青的技术性能指标,其次对比分析了春风塔河90A与疆内某90A沥青混合料的高温水稳定性能、高温抗车辙性能、低温抗裂性能、抗疲劳性能.对比可知,春风原油减渣和塔河原油减渣经调和后的春风塔河A级优质道路沥青性能使得疆内沥青品质进一步提升,沥青混合料性能进一步改善,指导了春风塔河沥青在新疆、我国西北地区以及"一带一路"中亚国家类似气候特点地区的推广应用.     

GSM-R基站子系统同步方案研究

介绍了目前GSM-R系统同步组网结构,总结了该组网结构与国内外行业标准的差别;对比分析了再定时、外部时钟输入和空口软同步3种时钟同步改进方案的优缺点;在实验室搭建测试环境,分2种场景对再定时功能进行了测试,得出再定时功能更适用于具有良好精度和稳定度的时钟参考源的传输设备;以郑西高铁故障为例.验证了再定时功能的作用和不足;根据工程投资和设备接口等情况,提出了4种同步组网建议方案,供工程设计和设备招标参考。     

Data-driven ferry network design with candidate service arcs: the case of Zhuhai Islands in China

ABSTRACT

We investigate a ferry network design problem with candidate service arcs (FNDP-SA), which is a new variant motivated by areal-world case from Zhuhai Islands. In this research, the design of a ferry schedule must conform to strict constraints including technical feasibility, safety issues, environmental impacts and moreover, avoid conflicting with ferries from neighboring cities (i.e. HongKong, Shenzhen and Macao). Therefore, a set of cautiously approved service arcs are firstly given, based on which the ferry service network is optimized. This study is among the first to formally describe the FNDP-SA and model it as an integer program. A hybrid variable neighborhood descent (VND)-based algorithm is developed. Two sets of instances are generated based on the case of Zhuhai Islands, where the first set is based on historical ticket sales data while the second set is derived by incorporating increased demands in the future according to a questionnaire survey. Numerical studies have shown that 59% cost reduction on the first set can be achieved by the proposed VND algorithm when compared with manual results. Research outcomes of this study have been adopted and implemented to facilitate the sustainable development of the ferry service of Zhuhai Islands.     

Robust decoupled anti-pitching control of a high-speed multihull

Journal of Marine Science and Technology - Since large heave and pitch motions of a high-speed multihull seriously affect the navigability of the ship, it is significant to design the effective...     

从电缆中拾取信号的工艺方法

本文提出了一种从连接在装备上的封闭的电缆中,拾取每一根导线中流经的电信息的工艺方法。详细介绍了电缆绝缘信息环的"一环两套"的组成、制作的具体工艺流程和原理样品的实物图片。该发明直接在电缆上搭建了一个对流经电缆的各种信号可随时进行检测、监控的平台,工艺方法新颖、简单、实用,普遍适用于从电缆中进行动态信号的采集。     

地铁小半径曲线对轨道状态及车体振动影响研究

地铁小半径曲线与车体振动、舒适度及轨道状态关系密切,文章通过对广州地铁各曲线进行长期试验研究,分析小半径曲线与轨道状态、车体振动、行车舒适度的关系以及演变规律。研究结果表明,车辆通过小半径曲线时,行车速度越大,车体横向加速度越大,乘客舒适度越差;曲线半径越小,乘客舒适度越差;通过小半径曲线与其他曲线、直线的轨道质量指数(TQI)对比发现,曲线的半径越小,TQI越大,轨道状态、轮轨接触关系越差。最后提出通过小曲线的速度建议。