Interactive image-based information visualization for aircraft trajectory analysis

Objectives: The objective of the presented work is to present novel methods for big data exploration in the Air Traffic Control (ATC) domain. Data is formed by sets of airplane trajectories, or trails, which in turn records the positions of an aircraft in a given airspace at several time instants, and additional information such as flight height, speed, fuel consumption, and metadata (e.g. flight ID). Analyzing and understanding this time-dependent data poses several non-trivial challenges to information visualization.Materials and methods: To address this Big Data challenge, we present a set of novel methods to analyze aircraft trajectories with interactive image-based information visualization techniques.As a result, we address the scalability challenges in terms of data manipulation and open questions by presenting a set of related visual analysis methods that focus on decision-support in the ATC domain. All methods use image-based techniques, in order to outline the advantages of such techniques in our application context, and illustrated by means of use-cases from the ATC domain.Results: For each considered use-case, we outline the type of questions posed by domain experts, data involved in addressing these questions, and describe the specific image-based techniques we used to address these questions. Further, for each of the proposed techniques, we describe the visual representation and interaction mechanisms that have been used to address the above-mentioned goals. We illustrate these use-cases with real-life datasets from the ATC domain, and show how our techniques can help end-users in the ATC domain discover new insights, and solve problems, involving the presented datasets.     

Effect of a speed reduction of containerships in response to higher energy costs in Sulphur Emission Control Areas

The objective of this paper is to explore the possible consequences of the future low-sulphur fuel requirements in Sulphur Emission Control Areas (SECA) on vessel speed, from the standpoint of the container shipping industry. Rational energy use, speed reduction, and revenues are closely related in the container shipping sector because speed reductions may provide substantial energy and cost savings. The operators could consider reducing their speed in SECA in order to save on fuel that will become relatively expensive. However, to maintain a weekly frequency without adding new ships, such a behaviour implies that the required speed at sea outside the SECA area increases. This paper aims to investigate if such a difference in speed is cost-effective, and if the increase in speed outside SECA may result in an increase in CO₂ emissions of the total cycle. We propose a cost model that estimates the cost-minimising combination of speeds inside and outside SECA, and the resulting CO₂ emissions of the liner service. Applying this model to representative liner services serving North Europe, we find that differentiating speed accordingly slightly decreases total costs and increases CO₂ emissions in a similar way. The results are sensitive to the price of low-sulphur fuels, the part of the cycle in SECA and the number of ships deployed in the service.     

运动带钢平面上粘性流体吹扫装置——在宝钢冷轧机组上的应用

本文论述了可用于去除轧制后残存在带钢表面润滑剂的改进型喷嘴吹扫装置，实际应用表明，改进型喷嘴吹扫装置可使带钢表面乳化液斑迹次品率降低，并降低了连轧机组末级出口处的噪声。     

船用空压机故障分析

在论述船用空压机基本结构的基础上,总结了船用空压机的故障特点.根据调研数据总结了船用空压机常见的故障现象,并分析了各种故障现象下的故障原因和故障排除方法,有助于快速查找故障部位和排除故障.     

涡轮增压器压气机的气动噪声源特性研究

基于雷诺平均纳维-斯托克斯方程与Realizableκ-ε双方程湍流模型,利用CFD软件建立了某大型涡轮增压器离心式压气机内部气体的可压缩流动仿真模型。分析了不同工况下压气机内部气流的速度、压力等流动特性,利用宽带噪声模型对压气机进行了气动噪声源数值研究。结果表明,叶轮区域是压气机的主要气动噪声源;压气机内扰动强度和叶轮转速是气动噪声声功率的主要影响因素;宽带噪声与湍流强度的分布趋势一致。研究结果对分析压气机的气动噪声源产生机理及其控制具有参考价值。     

厢式半挂车空气悬架系统的仿真分析

空气悬架系统是保证厢式半挂车行驶平顺性的重要组成部分。为研究该系统的各主要结构参数对半挂车动态响应的影响,采用M atlab/S imu link/D sp的仿真平台,对某半挂车进行建模,并建立了随机路面输入的实时仿真分析系统。试验结果验证了仿真分析系统的正确性,为空气悬架系统的设计与匹配提供了依据。     

海洋平台压缩机管系气流脉动分析

在开发海上天然气资源过程中,压缩机管道振动会造成管道结构疲劳破坏、计测仪表失真或损坏等严重的危害,而气流脉动是导致往复式压缩机管系振动的根本原因。对气流脉动产生的原因进行简要分析,并根据转移矩阵法,在得到各管系单元的转移矩阵的基础上,采用MATLAB编程设计压缩机管系气柱固有频率的预报系统,对一段复杂管系的气柱固有频率进行计算,将其与试验值相对比,验证该预报系统的可靠性。采用Bentley PULS XM软件对某海洋平台的部分压缩机管道系统进行压力脉动计算,并将计算结果与规范要求相比较,对其管道系统的不合理的部分进行优化。     

广州地铁一号线车辆空调压缩机故障分析及改进建议

介绍了广州地铁一号线车辆使用的空调压缩机的主要特点和控制原理,结合控制回路对导致压缩机故障的原因进行了分析,并提出改造措施。     

船舶空调系统设计新思路-低温送风

如何解决船舶空调系统在船上有限空间内的布置和船舶空调舒适性的矛盾，一直是船舶空调系统设计人员所追求的目标，本文介绍一种低温送风系统，探讨在船舶空调行业中的应用，期望能设计出更好的船舶空调系统。     

DF4B、DF4D机车空压机润滑油惯性乳化原因和解决措施

压缩机吸风口位于冷却主风道附近，使得潮湿空气被直接吸入机内，并冷凝成水，这是DF4B、DF4DN种机型压缩机润滑油惯性乳化的重要原因。本文从调研、检测和试验方面分析乳化原因，并提出采用提高抗乳化性能的200号压缩机润滑油等解决措施。