提高乘坐舒适度的措施

介绍了日本新干线为提高车辆乘坐舒适度所采取的一系列措施。     

A dynamic CSTT model for the effects of added nutrients in Loch Creran, a shallow fjord

Despite a tendency for the complexity of physical–biological models to increase, simple coupled models remain useful for some applications and can provide insights into crucial links between physical and biological processes. This argument is illustrated with an account of a simple 3-box model intended to help assess the capacity of fjords to assimilate nutrients from fish farms. The model, a dynamic version of the UK “Comprehensive Studies Task Team” (CSTT) steady-state model for eutrophication, was applied to Loch Creran (Scottish Western Highlands) and was implemented using Stella 8 and tested using historical data from 1975 (before the installation of a salmon farm) and field data collected in 2003, during the period of operation of the farm. The model's biological state variables are chlorophyll, dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP), and it includes a simple run-off model to convert rainfall into river discharge. The physical processes involved in exchange between the loch and the adjacent waters of the Firth of Lorne were parameterised as a constant daily exchange rate.Between 1975 and 2003, local inputs of nutrient increased but, despite this, there was little apparent increase in nutrient concentrations in the loch, and observed chlorophyll concentrations decreased substantially. Model simulations of chlorophyll and DIN agreed well with observations in 1975, as did DIN simulations in 2003. However, simulated chlorophyll was overestimated in 2003.Some of the agreement between observations and simulations come from the use of observed boundary conditions to force the model. However, even when boundary conditions are subtracted from simulations and observations, the simulations in most cases retain a significant correlation with observations, demonstrating that the model's ‘interior’ processes do add to its ability to replicate conditions in the loch.     

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基于性能的导航（Performance Based Navigation,PBN）飞行程序设计方案的优选对提高终端区空域的容量,空中交通管理工作的质量、效率,甚至飞机的飞行安全至关重要.但在实际操作中,PBN飞行程序设计方案的评估通常由有关专家根据机场的特点,依据专业知识及经验来确定优选方案,存在主观性和随意性的缺陷.为了提高PBN飞行程序设计方案优选的合理性和有效性,本文构建了PBN飞行程序设计方案的评价指标体系,建立了基于相对优势度法的区间数多属性评价模型.在该模型中,属性权重及评价指标值均采用区间数形式赋值,这些区间数用于计算备选方案的相对优势度,通过选择最大相对优势度来确定最佳方案.实例证明,所提出的评价模型能充分利用决策信息,有效地解决PBN飞行程序设计方案的优选问题.     

汽车电子器件的故障维修

当今汽车装备中,电气、电子系统占居了很大比重。由于各种电子系统有各自不同的控制模块,而电路与电路之间又存在着诸多的连系,因此出现故障时,人们很容易搞混。经常会有维修人员在对出现故障的电子系统进行了动力和接地测试后,却无从下手,转而又请教他人的事情。更有甚者,一些维修人员对难以着手的问题轻易下结论,例如黑盒子故障,接着便随手将价格昂贵的故障模块丢弃的现象。 通常情况下,维修人员是能够解决电子、电气方面故障的。你只需详细查看受     

遗传算法在电力系统无功优化中的应用

详细介绍了浮点数编码遗传算法的编码、选择、交叉、变异等操作.该编码不仅可以降低算法的搜索空间,而且可以避免初始化及在遗传操作中生成的不可行解.将该算法用于IEEE30节点系统,结果表明,该方法降低了网络损耗,实现了电力系统的无功优化,得到了满意的结果.     

基于模型预测控制无人驾驶车辆避障轨迹跟踪器设计

针对无人驾驶车辆的轨迹跟踪和避障问题,基于模型预测控制算法设计了避障轨迹跟踪控制器,实现避障和轨迹跟踪功能。在不同车速下采用Matlab和CarSim进行联合仿真试验,结果表明:设计的控制器控制性能和稳定性良好,能满足无人驾驶车辆的避障和轨迹跟踪需求。     

由超导线圈和大块超导体构成的磁性轴承的力密度研究

介绍了日本南超导线圈和大块超导体构成的磁性轴承在力密度方面的研究成果。     

Optimum routing of a sailing wind farm

To acquire the wind energy of the oceans, a sailing wind farm has been proposed. The wind farm considered is composed of a semisubmersible floating structure, 11 windmills, four sails, six thrusters, and storage for hydrogen. To maximize the acquired energy, an effective algorithm to search for optimum routes was developed. The algorithm is based on the fact that beam winds yield a maximum of acquired energy. This feature reduces the computation time, and, consequently, efficient route optimization becomes possible in a reasonable time. After setting an operational area for the wind farm, navigation simulations for a 1-year period were carried out. A numerical weather forecast was used as well as the responses of the floating structure, such as the speed of the structure, the output power of the windmills, and the time of course changes. In the simulation, the wind farm evades rough seas to avoid structural damage, and an optimum route is searched for. The capacity factor of the system was used to evaluate the efficiency of the optimized routes. From the simulations, the maximum capacity factor achieved was 42.6%. The dependency of the capacity factor on the initial position of the wind farm was also examined. It was shown that offshore from Sanriku in northeastern Japan is an area suited to the operation of the wind farm. The effect of the initial position on consecutive periods of operation is discussed.     

车轮定位基础

给车轮进行正确的定位,可以使汽车操纵起来更安全、乘坐更舒适,并能够最大限度地延长汽车轮胎的使用寿命。 现代汽车转向和悬挂系统是立体几何学在工程实践中成功应用的范例之一。车轮定位整合了转向和悬挂系统的所有几何参数,以便获得安全的操纵性、乘坐的舒适性以及最长的轮胎使用寿命。 前轮定位的含义是指由转向和悬挂系统部件之间形成的角度。一般来说,汽车维修工需要检查前轮的5个定位参数:主销后倾角、车轮外倾角、车轮前束、转向轴内倾     

110 kV变电站三种典型接线方式的探讨

就国内一些城市高压配电网的特点,针对三种典型的110 kV变电站一次侧接线方式,从经济性、可靠性、运行灵活性这三个方面分析比较,推荐应该采用T型接线、线路变压器组接线为主要型式.对城市的高压配电网110 kV变电站一次侧接线方式的选择也具有较强的参考价值.