Download or read book An Advanced Time dependent Queueing Model for Airport Delay Analysis written by Emily Jane Roth and published by . This book was released on 1979 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: In the past several years many attempts have been made to model the probabilistic nature of airport runway operations using a queueing-theoretic approach to runway modeling. Early studies were limited by computational considerations to examination of systems only once they reached "steady state". These models were unable to reflect the characteristic hourly "rises" and "falls" of demand for runway use at major airports. Koopman was the first to include time-varying demand in a queueing model of a runway. He examined simple M(t)/M/l and M(t)/D/1 models with planes awaiting landing or takeoff placed in a single common queue. By using advanced numerical techniques he showed that the airport system equations can be solved recursively through the computer to exhibit the system behavior as a function of time. A later study by Hengsbach and Odoni extended these models to include the case of k independent runways. This study also resulted in a set of computer programs which increased tremendously the computational efficiency of this approach. In this report we explore, for the first time, time-dependent queueing-theoretic models in which landing and departing aircraft are kept in separate queues. This allows explicit acknowledgement of various sequencing strategies by air traffic controllers and computation of separate statistics for delays to landings and to takeoffs. The report is organized into several basic sections. Expanding on an idea introduced by Koopman, we begin with the development of a basic two-queue runway model under time-varying demand. We then present an extended model which more realistically reflects actual airport runway situations. Third, results from an experimental investigation with these models are presented, including comparisons with the earlier single-queue model. Section 4 is a discussion of the expected delay to aircraft in these two-queue systems. Finally, we mention some simple extensions and suggest directions for further study.
Download or read book Journal of Aircraft written by and published by . This book was released on 1997 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time Dependent Estimates of Delays and Delay Costs at Major Airports written by Gerd Hengsbach and published by . This book was released on 1975 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two queuing models appropriate for estimating time dependent delays and delay costs at major airports are reviewed. The models use the demand and capacity profiles at any given airport as well as the number of runways there to compute bounds on queuing statistics. The bounds are obtained through the iterative solution of systems of equations describing the two models. This computational procedure is highly efficient and inexpensive. The assumptions and limitations of the models are discussed. Common characteristics and properties of delay profiles at major airport are illustrated through a detailed example. Potential applications to the exploration of the effect of air traffic control innovations on congestion and to the estimation of marginal delay costs are also described.
Download or read book Annual Air Traffic Control Association Fall Conference Proceedings written by Air Traffic Control Association. Fall Conference and published by . This book was released on 1989 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Annual Air Traffic Control Association Fall Conference written by Air Traffic Control Association and published by . This book was released on 1989 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applications of Queueing Theory written by Gordon Frank Newell and published by . This book was released on 1971 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid approximations; Simple queueing systems; Stochastic models; Equilibrium distributions; Diffusion approximations; Time-dependent queues; Neglected subjects.
Download or read book Transient Analysis of D t M t 1 Queuing System with Applications to Computing Airport Delays written by Shubham Gupta (Ph. D.) and published by . This book was released on 2010 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is motivated by the desire to estimate air traffic delays at airports under a range of assumptions about the predictability of (a) inter-arrival times of demands (arrivals and departures) and (b) service times of aircraft movements (landings and takeoffs). It consists of two main parts. In the first, a transient analysis of a D(t)/M(t)/1 queuing system is presented. The reason for focusing on such a system is that it may be useful in evaluating some of the benefits of a future Air Traffic Management (ATM) system, such as the Next Generation Air Transportation System (NGATS or NextGen) currently being developed in the United States. One of the main features of these future ATM systems will be high predictability and regularity of the inter-arrival times of airport demands, i.e., a nearly deterministic demand process. This will be achieved through significant reductions in aircraft trajectory uncertainty, with the expectation that airport delays will also decrease substantially as a result. We develop a novel, computationally-efficient numerical approach for solving D(t)/M(t)/1 queuing systems with general, dynamic demand and service rates. We also discuss the complexity of the approach and some characteristics of the resulting solutions. In the second part of the thesis, we use a set of models of dynamic queuing systems, in addition to our D(t)/M(t)/1 model to explore the range of values that airport delays may assume under different sets of assumptions about the level of uncertainty associated with demand inter-arrival times and with service times. We thus compute airport delays under different queuing systems in a dynamic setting (where demand and service rates are time-varying) to capture the entire range of uncertainties expected during the deployment of various future ATM system technologies. The specific additional models we consider are: a deterministic D(t)/D(t)/1 model in which it is assumed that airport demands for landings and takeoffs occur at exactly as scheduled; and a M(t)/Ek(t)/1 model which, because of the "richness" of the family of Erlang distributions, Ek, can be used to approximate most M(t)/G(t)/1 models that may arise in airport applications. It can be seen that these models, when used together, provide bounds on estimated airport delays, with the D(t)/D(t)/1 model most likely to offer a lower bound and the M(t)/M(t)/1 model (i.e., the special case of M(t)/Ek(t)/1 with k = 1), an upper bound. We show through a set of examples based on a few of the busiest airports in the United States that: the closeness of the delay estimates provided by the different models depend on the level of congestion at an airport and the relative shapes of the dynamic profiles of capacity and demand at the airport; the difference (on a "percentage" basis) between the estimates provided by the deterministic model and the stochastic ones is largest for uncongested airports and decreases as the level of congestion increases; D(t)/M(t)/1 and M(t)/D(t)/1 produce estimates of the same order of magnitude, and reflect delays in the presence of "moderate" uncertainty at an airport; and delays under a D(t)/M(t)/1 queuing system are always higher than under a M(t)/D(t)/1 system.
Download or read book Proceedings of the Simulators International XV written by Maurice Ades and published by . This book was released on 1998 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report Highway Research Board written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1975 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Airport Terminal and Landside Design and Operation 1990 written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1990 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Anais do IV Congresso Latino bero Americano de Pesquisa Operacional e Engenharia de Sistemas e XXI Simp sio Brasileiro de Pesquisa Operacional written by and published by . This book was released on 1988 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 1990 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TRB Special Report written by and published by . This book was released on 1975 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 1362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1974 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
