轻型多旋翼无人机在海事执法工作中的应用与管理

文中介绍了轻型多旋翼无人机凭借体积小、质量轻、操作简单、成本低等优势成为了助力海事监管效能提升的重要帮手.但由于无人机参与执法存在一定的安全隐患,在使用中应加强风险管理并提出建立健全无人机使用安全管理机制;强化专业人才队伍建设;加强无人机飞行安全保障;强化无人机投保续保意识;推动海事无人机行业标准制定的风险管理对策.     

粉砂土地区轻型桥台桩基础设计

以工程设计前的方案比选,对钢筋混凝土轻型桥台的桩基础进行比较计算,确定合理的结构型式,总结了粉砂土等软弱土质地区轻型桥台设计中桩基础的选取原则。     

模糊控制方法在汽车防抱制动系统中的应用

将模糊控制理论引入汽车防抱制动系统，用以确定防抱制动系统的参数。针对简化的汽车模型，设计了普通模糊控制器和一种自透应模糊控制器。计算机数字仿真试验结果表明这两种控制器能取得较好的控制效果。     

Influence of Light Distribution and Installation Style of Luminaires on Power Consumption and Lighting Effect of Tunnel Lighting北大核心CSCD

Light distribution (LD) and installation style of luminaires affect the utilization factor (UF) of luminaires, and the UF affects the luminaire power and road pavement illuminance and further the power consumption of illu- minating system and the luminous effect of road pavement. An UF model of tunnel lighting was established based on the luminaire LD data and installation parameters, in which four LD styles were adopted. For each LD the parame- ters optimization and simulation were conducted regarding four installation styles, e.g. central style, offset-of-vault style, symmetric style and staggered style. The energy-saving and the lighting effects of each LD and luminaire in- stallation style at the tunnel middle zone were studied. The results show that symmetric luminaire installation is the most energy-saving style and has the best lighting effect than the other three luminaire installation styles; the lighting effect of central luminaire installation is the second best; staggered luminaire installation is the most energy-intensive style and has the worst lighting effect except for some special-shaped LD; waterdrop-shaped LD is the most suitable one along transverse direction of tunnel and applicable to the central, offset-of-vault and symmetric luminaire instal- lation styles; symmetric butterfly-shaped LD is the most suitable one along longitudinal direction of tunnel and appli- cable to the central, offset-of-vault, staggered and symmetric luminaire installation styles; with waterdrop-shaped LD along transverse direction and symmetric butterfly-shaped LD along longitudinal direction, they are suitable for the above four luminaire installation styles, and have better energy-saving and lighting effect; as for the LD with symmetric and oblique curve, it’s better for the profile of oblique luminaire distribution to be comply with that along tunnel transverse direction, and it is suitable for the symmetric and offset-of-vault luminaire installation styles. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

HGM-D型高摩合成闸瓦在肯尼亚蒙内铁路的运用

介绍了肯尼亚蒙内铁路概况及线路特点,HGM-D型高摩合成闸瓦性能参数以及在蒙内铁路C70E、X70、NX70型货车上运用验证情况.验证表明HGM-D型高摩合成闸瓦有效降低车轮和闸瓦磨耗量以及闸瓦金属镶嵌物,提高了车辆运行品质和制动效能.     

津滨轻轨SEPCOS控制保护装置的可靠性改造

简述了津滨轻轨SEPCOS控制保护装置的功能、现状,详细介绍了SEPCOS控制保护装置技术改造的内容、方法、效果等,通过改造提升了SEPCOS装置工作的可靠性。     

摩托车和轻便摩托车轻合金车轮新老标准分析(1)

通过对摩托车和轻便摩托车轻合金车轮新老标准分析看到,新标准能更科学合理地为生产企业提供技术内涵和技术平台,以及更科学合理的检测方法。随着车轮行业的不断发展和国际化,也对检测技术提出了新的、更高要求。因此,必须不断加强对车轮行业技术更新的理念,扩大视野和交流平台,不断更新技术和工艺水平,缩短与世界车轮先进水平的技术差距,努力打造出更科学、更合理、国际化的车轮行业标准。     

Non-exhaust particle emissions under various driving conditions: Implications for sustainable mobility

Non-exhaust particle (NEP) emissions from road traffic contribute significantly to Particulate Matter (PM) pollution in urban areas. The primary objective herein is to develop the knowledge required to move toward more sustainable mobility. NEP emissions are studied by means of complementary experiments on chassis dynamometers, on test tracks and at the roadside. Laboratory tests demonstrate that brake wear particles (BWP) emissions can change with braking force and frequency. A brake pad temperature threshold exists, above which the rate of ultrafine particle emissions is quite high. Below this threshold, the BWP emissions are dominant in the accumulation and coarse modes. Test track measurements have demonstrated that tire-road contact particle (TRCP) emissions considerably modify the atmospheric PM background especially for the supermicron fraction. Their number size distribution highlighted an ultrafine and accumulation modes centered at about 40 nm and 200 nm, respectively. The TRCP level increases with vehicle speed and during the acceleration and deceleration phases. Roadside measurements in the urban environment confirm the presence of NEP in significant proportions, in both the accumulation and coarse modes. The chemical composition of NEP differs depending on the size mode: BWP mainly stem from the degradation of brake pad lining materials, while TRCP are a mixture of tire tread wear and re-suspended dust. The presence of Fe-rich particles nevertheless serves as a good indicator of the NEP contribution to PM at the roadside. Lastly, in considering the parameters influencing NEP emissions, a series of recommendations are offered in order to achieve a more sustainable mobility.     

一种新型增力式车轮制动器

研制了一种利用滚柱并通过楔形结构实现制动增力的新型增力式车轮制动器,该结构可使制动蹄受力合理、磨损均匀,为中、重型汽车采用液压制动提供了有效的途径。介绍了该制动器的结构、工作原理,确立了增力条件,导出了一些关键参数的确定方法。初步试验表明,该增力式车轮制动器增力效果显著,制动力大小仍然可以通过制动踏板进行控制,最大制动力能够达到试验车气压制动的水平。简要分析了存在的问题及解决方法。     

轿车制动性能的控制方法

针对目前轿车开发以逆向开发为主体,对整车制动性能控制能力较弱的实际问题,文章提出了一套制动性能控制方法,即以整车设计参数、制动强制性法规适应性及制动系统零部件尺寸系列化等为制动性能控制的输入约束条件,在设计初期预测新开发轿车的9项主要制动性能,经过多辆轿车制动系统的开发实践验证,此性能控制方法不仅可保证制动系统设计质量,而且缩短了轿车制动系统的设计周期。