Browsing by Author "Quan, Chuanwen"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Integrated Modeling of Air Traffic, Aviation Weather, and Communication SystemsQuan, Chuanwen (Virginia Tech, 2007-04-20)Aviation suffers many delays due to the lack of timely air traffic flow management. These delays are also caused by the uncertainty weather information; and the lack of efficient dissemination of weather products to pilots. It is clear that better models are needed to quantify air traffic flow in three flight regions - en-route, in the terminal, and on the ground, to determine aviation weather information requirements at each region, and to quantify their bandwidth requirements. Furthermore, the results from those models can be used to select alternative future aviation communication systems. In this research, the 'ITHINK' and 'MATLAB' software packages have been used to develop a lumped Air Traffic Flow Model (ATFM) and an Aviation Weather Information and Bandwidth Requirements Model (AWINBRM). The ATFM model is used to quantify the volume of air traffic in each phase of flight in three flight regions. This model can be used to study navigation, surveillance, and communication requirements. The AWINBRM model is used to study aviation weather information requirements in different flight phases of flight. Existing and potential communication systems used for transmitting aviation weather information are explored in this research. Finally, a usable and practical computer model - Aircraft Impacted and Detour Model (AIDM) around an aviation weather system is developed. This model is used to compare the costs between detoured flights around a weather system and delayed flights at the airports. The purpose of this research is to study air traffic flow and aviation weather information and bandwidth requirements through modeling. The ultimate goal of the models described here is to serve as a living laboratory where policies can be tried before implementing them into the real system. Moreover, these computer models can evolve dynamically through time allowing decision makers to exercise policies at various points in time to quantify results with ease. This research would be a first integrated model for combing air traffic flow and aviation weather requirements and determining the quantity of aviation weather information between pilot and ground service centers. This research would be a guideline for aviation industry to build an efficient and timely aviation weather information transmission system with minimum budget. Consequently, this research will reduce aviation delays and improve aviation safety.
- A system dynamics model for the development of China's air transportation systemQuan, Chuanwen (Virginia Tech, 1996)The primary purpose of this thesis is to estimate the demands on the Air Transportation System in China and to establish a systematic framework for China's Air Transpo11ation System Development in the future. The Systems Dynamics Methodology is used to analyze and understand the relationships between policy variables dictating the future of China's Air Transportation System and technological and economic variables to reach acceptable levels of service in a fast growing economy. Through alternative policy and sensitivity analysis, planners can gain insight into solving Air Transportation System development problems, understand how to operate the Air Transportation System, and to obtain the most efficient results through systems thinking. This model could be used to communicate relevant information to the decision makers in a readily understandable and useful form and in a timely fashion. Two models are developed in this thesis: 1) A macroscopic China's Socio-economic Development Model (CSEDM) and 2) A microscopic China's Air transportation System Development Model (CATSD1\1). CSED:NI is organized into the following components: Industry, Agriculture, Social, Infrastructure, Population, and Potential Air Demand and Air Subsidy sectors. The potential air demand is only referred to as the function of some socio-economic variables. The relationship between the potential air demand and some socio-economic variables is established by the macroscopic model. The potential air demand and air subsidy are estimated by the CSEDM. The China's Air Transportation System Development Model (CATSDM) comprises of the Airlines, Air Routes and Airports sectors. The potential air demand will be calibrated by the elasticity coefficient of the air fare and the total annual delay. Both models have been developed in STELLA IT, a computer software to develop Systems Dynamics models. The most important outputs of the model are the number of aircraft, airports and airspace routes to maintain pace with China's growing economy. Various policies variables have been examined to estimate their effect in the air transportation demand and airport growth.