Lab 7 comandi di volo relazione

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1 Politecnico di Milano Dipartimento di Ingegneria Aerospaziale Impianti e Sistemi Aerospaziali Flight control Project of an actuator and spoiler analysis - Elena Venutti July 2013 2 1. Introduction This report aims to evaluate the conditions for a right expansion of the spoiler. In particular it aims to find the correct positioning and dimensioning of the actuator, create an hydraulic diagram, plot diagrams of the system and, after having found the dynamic equation of the actuator, calculate the exact time of actuation. 3 2. Index 1. Introduction 2 2. Index 3 3. Symbols List 4 4. Description of the problem and resolution method 5 4.1. Positioning of the actuator 5 4.2. Dimensioning of the actuator 5 4.2.1. Extension 5 4.2.2. Force 5 4.2.3. Diameter 6 4.3. Hydraulic diagram 6 4.4. Dynamic equation of the actuator 6 4.5. Execution time 6 5. Problem’s data 7 6. Calculation and Results 7 6.1. Dimensioning 7 6.1.1. Extension 7 6.1.2. Force 8 6.1.3. Diameter 8 6.2. Diagrams 9 6.3. Execution time 12 7. Results and Conclusion 13 4 3. Symbol List Xa x-coordinate of A Ya y-coordinate of A Xb x-coordinate of B Yb y-coordinate of B Dab distance AB a coefficient of y b coefficient of x c known term t Time α Canonic angle β Spoiler’s deflection angle Stot Hydraulic ram total extension S Extension based on theta H Force’s arm R Radius (distance OB) F Force M Hinge Moment Mo Initial Hinge Moment Kt Torsion Coefficient J Inertia’s Moment Dc Cylinder diameter Ds Stalk diameter Ac Cylinder area As Stalk area K Weight losses Q Flow Ps Tank’s Pressure Pp Pilot pressure Pcr Peak load E Young’s modulus 5 4. Description of the problem and resolution method 4.1 Positioning I don’t know which is the better position for the actuator so I start to position A point: Xa = 200 mm Yb = -80 mm Then I…