MAE155A_HW3A - MAE 155A Aerospace Engineering Design I...

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MAE 155A Aerospace Engineering Design I Winter 2010 Homework #3A (Aircraft Design) DUE DATE: Thursday, 18 FEB 2010 Problem #1 Airplanes on approach to San Diego (SAN) airport pass directly over parts of Balboa Park and the downtown area. Compute the SPL when an airplane passes directly overhead an unfortunate apartment dweller that lives 2 Km away from the SAN runway threshold. A jet engine operating at 100% thrust produces 100 dB SPL at 1,000 ft reference distance. Assume that the airplane throttles are set at 50% thrust on approach, and that the sound intensity is proportional to the square of engine thrust. (i.e. I/I max = (T/T max ) 2 ). Also assume that the airplane is on a 3-degree landing approach flight path. The atmospheric absorption coefficient is 1.2 dB per 1,000 ft. Problem #2 Use the refined sizing method (Lecture 4 and Raymer CH6) to design a "super-cruise" military fighter that satisfies the following requirements. a) takeoff ground-roll distance < 8,000 ft at sea level b) cruise at M1.6, 50Kft, to operating area 1,000 nmi away c) perform sustained 1.2g turn, M1.6, 50Kft, with W/W
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