examples_aircraft_perf_1

# examples_aircraft_perf_1 - Virginia Tech Air Transportation...

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Unformatted text preview: Virginia Tech - Air Transportation Systems Laboratory Detailed Example of Aircraft Performance Calculations: Climb Performance CEE 5614 Analysis of Air Transportation Systems Dr. Antonio A. Trani Professor Virginia Tech - Air Transportation Systems Laboratory Example - Aircraft Climb Performance • Use the the vehicle characteristics for the very large capacity transport aircraft in the Matlab files for CEE 5614 to solve this problem (http://128.173.204.63/courses/cee5614/cee5614_pub/ AirbusA380_class.m) • Estimate the rate of climb for this aircraft at two distinct points in the climb profile: • a) 600 meters (2,000 feet) and 210 knots - IAS • b) 8,000 meters (26,200 feet) and 290 knots - IAS • Estimate the thrust produced by the engines under both conditions • Find the Lift to Drag ratio for both conditions • Assume the International Standard Atmosphere applies to both aircraft states 2 Virginia Tech - Air Transportation Systems Laboratory Example - Aircraft Climb Performance Data File • Very large capacity transport aircraft (http://128.173.204.63/ courses/cee5614/cee5614_pub/AirbusA380_class.m ) geometric, mass and speci±c fuel consumption drag data engine thrust data speed pro±le data 3 Virginia Tech - Air Transportation Systems Laboratory Example - Aircraft Climb Performance Controlling the Speed ProFle • Very large capacity transport aircraft (http://128.173.204.63/ courses/cee5614/cee5614_pub/AirbusA380_class.m ) • The aircraft speed is controlled by the last three lines of data in the aircraft data file • Line 1 (see below) defines the climb speed in knots (indicated airspeed) • Line 2 defines the descent speed in knots (IAS) • Line 3 defines the altitudes at which each speed value is selected • For example: The aircraft below climbs at 210 knots just after takeoff (zero altitude) and reaches 250 knots at 4000 meters 4 Virginia Tech - Air Transportation Systems Laboratory Example - Very Large Capacity Aircraft Data File • An aircraft similar in size and performance as the Airbus A380 • Four turbofan engines each developing 34,400 kg (338,000 N) at sea level • Maximum takeoff mass is 540,000 kg. (1.188 million pounds) Airbus A380 taxies to the gate at LAX (A.A. Trani) 5 Virginia Tech - Air Transportation Systems Laboratory Example - Aircraft Climb Performance Picture the Situation • Always picture the situation and sketch a free body diagram of the system • For this analysis we will ignore the second term in the Right Hand Side (RHS) of the differential equation (acceleration term) • This simulates that the pilot is interested in climbing as fast as possible and thus using all the engine thrust to climb 6 Virginia Tech - Air Transportation Systems Laboratory Calculation of Performance at two points in the Climb ProFle • The analysis assumes the aircraft is studied as a point mass system. We evaluate the performance at two discrete points • The analysis can be repeated many times to study time to climb, fuel used, and other metrics 7 Virginia Tech - Air Transportation Systems Laboratory...
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## This note was uploaded on 12/31/2011 for the course CEE 5614 taught by Professor Staff during the Fall '10 term at Virginia Tech.

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examples_aircraft_perf_1 - Virginia Tech Air Transportation...

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