a7_cee4674_2009_sol

# a7_cee4674_2009_sol - CEE 4674 Airport Planning and Design...

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CEE 4674 A7 Trani Page 1 of 10 CEE 4674: Airport Planning and Design Spring 2008 Assignment 7: Date Due: April 15, 2007 Instructor: Trani Problem 1 An airport has two parallel runways separated 5,000 feet away and oriented North-South. The saturation capacity analysis for one of the runways yields the Pareto diagram shown in Figure 1. Assume that the fleet mix operating at both runways is the same. The diagram assumes that the runway is operated in mixed mode. The analysis was done for IFR conditions. Figure 1. One-runway Pareto Diagram. Mixed Runway Use. IFR Conditions. Numbers in the Plot Represent (Departure, Arrival) Pairs. a) Draw the Pareto capacity diagram for the complete airport runway system (i.e., both runways) if the runways are used in segregated mode in IFR conditions. The Pareto diagram in segregated mode is easily constructed realizing that a single runway handles up to 32 arrivals per hour. The second runway would handle up to 54 departures per hour. The runway operations in segregated mode are independent since the runways are separated by 5,000 feet. Figure 2. Airport Runway Capacity with two Runways Operated in Segregated Mode. b) Find the expected value of the time between successive arrivals to the airport under the most demanding arrival conditions.

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A7 Trani Page 2 of 10 The highest demand load for arrivals at the airport is 40 arrivals per hour. This would produce an average time between arrivals of 90 seconds (3600/40). If the interpretation of the question is viewed as the maximum number of arrivals that can be processed at the airport (since this is in fact the limiting factor) per unit of time, the answer is 112.5 seconds (3600/32). c) If the airport is operated in segregated mode, determine the average delay to arriving aircraft if the arrival demand function proposed by the airlines is shown in Table 1. Assume IFR conditions prevail in the design day. Using the deterministic queueing model we can study the impact of calculated capacities in the delay of operations at the airport. Since the runways are operated independently (i.e., segregated mode), we estimate delays for arrivals on one runway and departure delays on the second runway as shown in Figure 3. Using the results of part (e) of this homework we know that a total of 395 aircraft were delayed in the three queue periods presented in Figure 5. Since the total delay for arrivals is estimated (using the numerical solution to the differential equations of the queueing process) to be 70.84 aircraft-hours. This implies the average delay per operation is 0.18 hours (70.84 aircraft-hrs/395 aircraft) or 10.8 minutes on average. Figure 3. Operational Calculation of Arrival and Departure Delays at the Airport.
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a7_cee4674_2009_sol - CEE 4674 Airport Planning and Design...

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