SIMULATION OF THE DYNAMIC BEHAVIOUR OF AN AIRCRAFT LANDING GEAR DURING LANDING
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1 Vienna University of Technology SIMULATION OF THE DYNAMIC BEHAVIOUR OF AN AIRCRAFT LANDING GEAR DURING LANDING Reinhard Lernbeiss 01 / 17 SIMPACK User Meeting 2004
2 Analytical-numerical numerical study of the shock strut applying dynamic loads Simulation of the shock strut with SIMPACK Simulation of landing and braking of the EMB 190 with SIMPACK EMB 190 Model of the regional airliner EMBRAER EMB 190 with SIMPACK for the simulation of manoeuvres on ground or close to ground Liebherr 02 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
3 Institut Shock strut with SIMPACK Landing/Braking simulation EMBRAER EMB 190 Main landing gear Nose landing gear max. Take-Off Weight: kg max. Landing Weight: kg 96 passengers, 4-5 cockpit/cabin crew 03 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
4 Main landing gear Air or Nitrogen Oil 3 Carbon Brake Discs rot. compressed forward 4 Brake Discs fixed Left main landing gear 04 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
5 Model of the shock strut considering bounce/rebound and bending FILM FILM 05 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
6 Dynamic Phenomena 06 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
7 Analytical-numerical numerical study Static bending deflection Bernoulli beam using transformation matrices Ax. compression F=10kN 200 mm 700 mm Bending deflection mm 5.17 mm FE Method Static bending deflection Analysis of Eigenfrequencies Analysis with dynamic loads 07 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
8 Analytical-numerical numerical study Equations of Motion FE-Model Part 1 Part 2 M u&& + Du& + K u = f () t mx && 2 F + dx& F + kxf = Pt () f ( t) = [0,0,0,0,0,0, F( t),0] T 08 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
9 Shock strut with SIMPACK Landing/Braking simulation Shock strut with SIMPACK Modelling the shock strut in SIMBEAM - SIMPACK Marker resp. constraints Connection Beam 1 and 2 Marker resp. constraints at fixed support Beam 1 compression Beam 2 09 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
10 Shock strut with SIMPACK Landing/Braking simulation Shock strut with SIMPACK Eigenfrequencies (Hz) displacement u deflection w f 1 ~ 10.5Hz f 2 ~ 125 Hz 10 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
11 Landing/Braking Simulation Landing touch down Elevator Force Wing Lift Attitude touch down 11 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
12 Landing/Braking Simulation Animation of simlation results: landing and braking FILM 12 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
13 Landing/Braking Simulation Anti Skid System S = k β + k s... control parameter r r s L β = ( Ω& r )/ g s L r R R = v r Ω v F R R F... normalized angular acceleration... longitudinal slip S S 0 S > S S 0 u1 S > S S S u1 u2 u2 > S... decrease of brake pressure... keep brake pressure... keep last brake pressure rate... increase of brake pressure 13 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
![Landing/Braking Simulation Numerical simulation results Vertical force [kn] at (elastic) main and (rigid) nose landing](/docs-images/48/24066551/images/14-0.jpg "gear main landing gear nose landing gear 14 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during")
14 Landing/Braking Simulation Numerical simulation results Vertical force [kn] at (elastic) main and (rigid) nose landing gear main landing gear nose landing gear 14 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
15 Landing/Braking Simulation Animation of Landing and Braking with Anti Skid System FILM 15 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
16 Landing/Braking Simulation Numerical simulation results elastic shock strut rigid shock strut Deflection w [mm] of centre of tyre Deflection w [mm] of centre of tyre 16 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
17 Institut Shock strut with SIMPACK Landing/Braking simulation Landing/Braking Simulation Numerical simulation results elastic shock strut ] longitudinal [m/s Deflection w deceleration [mm] of centre of2tyre 16a / 17 rigid shock strut Deflection w deceleration [mm] of centre of2tyre longitudinal [m/s ] Simulation of the dynamic behaviour of an aircraft landing gear during landing
18 Open problems - Outlook Tyre model for touch down Investigation of Shimmy-Phenomena Application of elastic fuselage FILM FILM 17 / 17 Simulation of the dynamic behaviour of an aircraft landing gear during landing
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