scholarly journals Modelling performance an air transport network operated by subsonic and supersonic aircraft

2020 ◽  
Vol 124 (1281) ◽  
pp. 1702-1739
Author(s):  
M. Janić
Keyword(s):  
Social Performance ◽  
Economic Feasibility ◽  
Transport Network ◽  
Air Transport ◽  
Analytical Models ◽  
Commercial Aircraft ◽  
Supersonic Aircraft ◽  
Route Network ◽  
Fuel Consumption And Emissions ◽  
The Given

ABSTRACTThis paper deals with modelling the performance of an air transport network operated by existing subsonic and the prospective supersonic commercial aircraft. Analytical models of indicators of the infrastructural, technical/technological, operational, economic, environmental, and social performance of the network relevant for the main actors/stakeholders involved are developed. The models are applied to the given long-haul air route network exclusively operated by subsonic and supersonic aircraft according to the specified “what-if” scenarios.The results from application of the models indicate that supersonic flights powered by LH2 (Liquid Hydrogen) could be more feasible than their subsonic counterparts powered by Jet A fuel, in terms of about three times higher technical productivity, 46% smaller size of the required fleet given the frequency of a single flight per day, 20% lower sum of the aircraft/airline operational, air passenger time, and considered external costs, up to two times higher overall social-economic feasibility, and 94% greater savings in contribution to global warming and climate change. These flights could be less feasible in terms of about 70-85% higher aircraft/airline operational costs, 70% and 19% higher fuel consumption and emissions of Green House Gases, respectively, and 6-13% higher noise compared to the specified acceptable levels.

scholarly journals Mapping a Multilayer Air Transport Network with the Integration of Airway, Route, and Flight Network

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Qinyan Zhou ◽  
Wendong Yang ◽  
Jinfu Zhu
Keyword(s):  
Traffic Control ◽  
Control Area ◽  
Transport Network ◽  
Air Transport ◽  
Integrated Network ◽  
Route Network ◽  
The Hierarchical Structure ◽  
Relationship Of ◽  
The Relationship

This paper develops a mapping approach to explore the relationship between different layers of a multilayer air transport network composed of airway, route, and flight network. A two-step methodology is adopted to investigate the hierarchical structure and mapping relationship of the integrated network. First, the relationship between airway and route network is characterized by a multisource multisink shortest path method based on a generalized incidence matrix. Second, the relationship between route and flight network is formulated by a two-dimension array. A case study of an en route airspace in Lanzhou air traffic control area in China verifies the feasibility of the proposed two-step methodology.

scholarly journals Predicting dengue importation into Europe, using machine learning and model-agnostic methods

2019 ◽  
Author(s):  
Donald Salami ◽  
Carla Alexandra Sousa ◽  
Maria do Rosário Oliveira Martins ◽  
César Capinha
Keyword(s):  
Machine Learning ◽  
Operating Characteristic ◽  
Predictive Accuracy ◽  
Predictive Performance ◽  
Machine Learning Algorithms ◽  
Transport Network ◽  
Air Transport ◽  
Health Concern ◽  
Centrality Measures ◽  
Network Centrality

ABSTRACTThe geographical spread of dengue is a global public health concern. This is largely mediated by the importation of dengue from endemic to non-endemic areas via the increasing connectivity of the global air transport network. The dynamic nature and intrinsic heterogeneity of the air transport network make it challenging to predict dengue importation.Here, we explore the capabilities of state-of-the-art machine learning algorithms to predict dengue importation. We trained four machine learning classifiers algorithms, using a 6-year historical dengue importation data for 21 countries in Europe and connectivity indices mediating importation and air transport network centrality measures. Predictive performance for the classifiers was evaluated using the area under the receiving operating characteristic curve, sensitivity, and specificity measures. Finally, we applied practical model-agnostic methods, to provide an in-depth explanation of our optimal model’s predictions on a global and local scale.Our best performing model achieved high predictive accuracy, with an area under the receiver operating characteristic score of 0.94 and a maximized sensitivity score of 0.88. The predictor variables identified as most important were the source country’s dengue incidence rate, population size, and volume of air passengers. Network centrality measures, describing the positioning of European countries within the air travel network, were also influential to the predictions.We demonstrated the high predictive performance of a machine learning model in predicting dengue importation and the utility of the model-agnostic methods to offer a comprehensive understanding of the reasons behind the predictions. Similar approaches can be utilized in the development of an operational early warning surveillance system for dengue importation.

The Role of Regional Airports in Connectivity and Regional Development

2021 ◽  
Author(s):  
Oscar Díaz Olariaga
Keyword(s):  
Economic Development ◽  
Regional Development ◽  
Socioeconomic Development ◽  
Transport Network ◽  
Air Transport ◽  
Investment Policies ◽  
Air Transport Industry ◽  
Social And Economic Development ◽  
Regional Airports

This article analyzes the contribution of regional airports in Colombia to the development of the domestic air transport network, and with it, to the connectivity of the regions and their social and economic development. The growth and evolution of Colombian regional airports are supported and driven by a set of public and investment policies, designed exclusively for the air sector and implemented, almost continuously, since the liberalization of the air transport industry in the country in the early 1990s and are still in development. Having said this, this work analyzes how the network of regional airports have been able to develop in two and a half decades through public policies, and later, how these airports have positively impacted connectivity and socioeconomic development in the territories. All this is done through the presentation and analysis of related indicators.

The African air transport network

2017 ◽  
pp. 40-60
Author(s):  
Davide Scotti ◽  
Gianmaria Martini ◽  
Stefano Leidi ◽  
Kenneth J. Button
Keyword(s):  
Transport Network ◽  
Air Transport

scholarly journals Evolution and Determinants of an Air Transport Network: A Case Study of the Chinese Main Air Transport Network

2019 ◽  
Vol 11 (14) ◽  
pp. 3933 ◽  
Author(s):  
Min Su ◽  
Weixin Luan ◽  
Zeyang Li ◽  
Shulin Wan ◽  
Zhenchao Zhang
Keyword(s):  
Network Structure ◽  
High Speed ◽  
Information Source ◽  
Small World ◽  
Transport Network ◽  
Air Transport ◽  
Promoting Effect ◽  
High Speed Rail ◽  
Path Lengths ◽  
The Impact

The Chinese main air transport network (CMATN) is the framework for air passenger transport in the country. This study uses complex networks and an econometric model to analyze CMATN’s evolution and determinants. In terms of overall network structure, the network has always shown small-world properties, with smaller average path lengths (2.06–2.15) and larger clustering coefficients (0.68–0.77), while its cumulative degree distribution follows an exponential function. City passenger volumes conform to the degree power law function, which means that the more destinations a city connects to, the higher its passenger traffic will be. In major hub cities, such as Beijing, Shanghai, and Guangzhou, control power decreases, while Chengdu, Kunming, Chongqing, Xi’an, Urumqi, and other cities play an increasingly important role in CMATN. In terms of main route passenger volumes and formation, increases in GDP and tourism have had a promoting effect, while high-speed rail (HSR) poses a threat to overlapping routes. CMATN is primarily located in the central and eastern regions, focusing on China’s economy, tourism, and efficient HSR development. Although the competition from HSR affects the overall network structure of CMATN based on its influence on specific routes, we believe that the impact is limited due to the different transport attributes of the two networks. The research results of this study can become an information source for decision makers and provide a reference for air transport to seek sustainable development.

Early Developments for a Semi-Analytical Model of Weld Induced Residual Stress

2007 ◽  
Author(s):  
Jess M. Bromley ◽  
Hassan Alizadeh ◽  
David J. Smith ◽  
Christopher E. Truman
Keyword(s):  
Residual Stress ◽  
Analytical Model ◽  
Thermal Processing ◽  
Complete Solution ◽  
Analytical Models ◽  
Thermal Processes ◽  
Rapid Testing ◽  
Plastic Slip ◽  
Computationally Expensive ◽  
The Given

The generation of plastic slip and residual stress by thermal processes is particularly difficult to understand and simulate. Modelling such problems is computationally expensive when approached numerically and extremely complex to approach analytically. ‘Semi-analytical’ models, in which analytical thermoelastic solutions are combined with approximate models of plasticity, offer a way to bridge this gap and have the potential to allow the rapid testing of parameter sensitivities before one launches a time-consuming full numerical model. However the construction of such models within such a thermal framework poses its own problems. An initial requirement for any such semi-analytical model is a complete solution to the elastic only response of the material to the given loading process. In this paper we focus on the formulation of such a solution for the simplest case relevant to welding or similar thermal processing. We verify the solution developed against finite element predictions and then further investigate it. In doing so we explain how the nature of this solution, especially its predicted yielding behaviour, has ramifications for the successful creation of a full semi-analytical solution.

The Problem of Landing Commercial Aircraft in Fog

1934 ◽  
Vol 38 (286) ◽  
pp. 807-836
Author(s):  
R. Stussel
Keyword(s):  
Weather Conditions ◽  
Air Transport ◽  
List Type ◽  
Type Number ◽  
Transport Service ◽  
Commercial Aircraft ◽  
Great Problem ◽  
Short Survey ◽  
Technical Aids ◽  
Bad Weather

Summary(1)Survey of the present methods of carrying out air transport service when visibility is bad.(2)What is essentially required of technical aids for landing under bad weather conditions.(3)Short survey of current German methods for solving the problem of landing in fog.The necessity for being able to carry out air transport unhindered by weather conditions is inseparably associated with the idea of commercial air service. This great problem of “ flight in any weather ” has confronted us since the inception of regular services between places having corresponding traffic needs, that is to say, since the very birth of air transport.

scholarly journals Characterization of Impacts of Elastic-plastic Spheres

2020 ◽  
Vol 64 (2) ◽  
pp. 165-171
Author(s):  
Bence Szabó ◽  
Attila Kossa
Keyword(s):  
Plastic Material ◽  
Analytical Models ◽  
Material Models ◽  
Elastic Plastic ◽  
Analytical Functions ◽  
Elastic Plastic Material ◽  
Explicit Dynamic ◽  
The Impact ◽  
The Given

This work presents explicit dynamic finite element simulations of various impacts of elastic-plastic solid spheres with flat walls. Different  analytical models describing the mechanics of the impact phenomenon are also presented. Elastic and elastic-plastic material models for the sphere and the wall are considered during the analyses. The applicability of these different models is demonstrated and their accuracies are investigated. Closed-form analytical functions are proposed to describe the relationship between the initial velocity of the sphere and the investigated contact characteristics for the given material models. Analysis is carried out to study the effect of the friction coefficient as well as the angle of impact for various cases.

Sign in / Sign up

Export Citation Format

Share Document