Aerospace Engineering, Summaries of Aerospace Engineering

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Repartment of | University of Technology Mechanical Engineering h stage/Aircraft E Note: Answer Five questions only. All questions have same mark Q1) Answer the followings. a) Explain with drawings: what is meant by i) Stable, ii) unstable, and iii) neutrally stable states of equilibrium? b) Number with drawings, types of motion following a disturbance-subsidence, ©) Define the following terms with illustrations: . )The Center of Gravity of aircraft, ii)The Neutral Point, iii)The Maneuver Point, and iv) Static Margin. Q2) An aircraft is described by: WIS = 2394.012 N/m? Stick fixed neutral point at 0.35¢ Ging: = +0.02 Cng = —0.75 rad Cig = +5.0 rad-1 Cys = +0.25 rad? @ = —0.01745 rad Verim = 130m/s¥ Position of c.g. at 0.30¢ Po = 1.225kg/m3 1. From longitudinal static stability conditions, derive the below formula to find the angle of attack and the elevator control 6 when the velocity is changed? Cay} = tal fc, } + tar fmege > me} where [A]“t= al us a A=, Al-C,, Cg 2. Determine a and 6 fora given initial trim velocity, Q3) Answer the followings. a) Explain the following terms with illustrations: ii) Body axes system and ii) Earth fixed axes. b) What is the meaning of Static Stability and Dynamic Stability? ¢) Define with illustrations the following terms: i) Angle of attack , ii) Sideslip angle, and iii) Bank angle. 4) From linear Equations below , find Longitudinal dynamic equations in state space form [hn] G3 = [An] 6&3 + {B,}6 . Write all assumptions required. AX(t) — mg (cos @,) 0(t) = ml, (u1/V,) AY (0) + mg(cos0,)(t) = mV, (8 +r) Z(t) — mg(sin @,)6(t) = mv, (4 — q) AL(t) = ep = Ig AM(t) = yg AN(t) = Lt = yp