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redim - VPI/CTR RUNWAY EXIT DESIGNS FOR CAPACITY...

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VPI/CTR RUNWAY EXIT DESIGNS FOR CAPACITY IMPROVEMENT DEMONSTRATIONS. General Research Overview Center for Transportation Research (Airport Analysis Branch) A.A. Trani, A.G. Hobeika, B.J Kim, X. Gu and C. Zhong Department of Civil Engineering Virginia Tech
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VPI/CTR Research Goals Development of an interactive computer model to design variable geometry runway turnoffs under realistic airport scenarios To establish a new turnoff standard to reduce runway occupancy time To test and validate the designs using computer simulations and FAA flight simulators To demonstrate possible runway capacity gains and aircraft delay reductions
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VPI/CTR Phases in Research Cycle Phase I: Algorithmic Development (1989-1990) Development of aircraft landing dynamics and exit selection algorithms Development of high-speed turnoff algorithms Development of turnoff location optimization routines Phase II: Computer Model Development (1990-1991) Development of a PC-based computer program (REDIM) Inclusion of realistic runway turnoff constraints Phase III: Test and Validation (1991-1993) Validation of REDIM solutions and turnoff algorithms Demonstration of capacity gains and delay reductions New high-speed turnoff standard implementation
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VPI/CTR Analysis Breakdown Structure Turnoff Characterization and Simulation Aircraft Landing Roll Simulation Model Runway Simulation Model Runway Occupancy Time Departure and Arrival Delays Mathematical Optimization of Turnoff Locations Runway Turnoff Candidate Generation Procedure Life Cycle Cost/Benefits Runway and Aircraft Population Information REDIM Model
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VPI/CTR Modeling the Landing Segments Air Distance Second Free Roll Distance First Free Roll Distance Aircraft Speed Braking Distance Exit Decision Point Decision Speed Exit Speed Nominal Deceleration Adjusted Deceleration Touchdown Point Turnoff Entrance Point Nominal Landing Roll Point Downrange Distance
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VPI/CTR Landing Simulation Model Input Parameters Aircraft Landing Weight Factors Aircraft Mix and Aircraft Characteristics Airport Operational Data Airport Environmental Data Runway Gradient Characteristics Aircraft Operational Data Weather Percentages and Aircraft Exit Speeds
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VPI/CTR Normative Aircraft Deceleration Algorithm A non-linear kinematic algorithm adjusts the aircraft deceleration pattern according to current aircraft state and location of a feasible exit location 2000 1750 1500 1250 1000 750 500 250 0 10 20 30 40 50 60 70 1600 m. 50.6 s. 1700 m. 55.4 s. 1800 m. 57.8 s. 1900 m. 62.8 s. 2000 m. 66.5 s. Nonlinear Aircraft Deceleration Model Distance from Threshold (mts.) Speed (m./sec.) Exit Location ROT Boeing 727-200 Data Decision Point Continuously Adjusting Braking Phase Nominal Braking Phase Flare Deceleration Phase
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VPI/CTR Improved Aircraft Deceleration Algorithm A simple algorithm adjusts the aircraft deceleration pattern according to current aircraft state and location of feasible exit locations (models both conservative and motivated behaviors) 2200 2000 1800 1600 1400 1200 1000 800 600 400 200 0 10 20 30 40 50 60 70 1600 m.
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