# EFFECT OF WING SWEEP ON STATIC AEROELASTIC BEHAVIOUR

Jun 17th, 2015
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Based on Figure 1, the graph shows the divergence speed increases with sweepback wing while decreases with forward sweep wing.

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EAS 3406AEROELASTICBYDR. MOHAMMAD YAZDI HARMINASSIGNMENT 1:EFFECT OF WING SWEEP ON STATIC AEROELASTIC BEHAVIOURNAME: ONG THIAM CHUNNO. MATRIC: 158347Assumption for static aeroelastic equation:i. Rigid wing with 2 roots, one for bending control (flapping) and one for twisting control (pitch).ii. Strip theory is assumed with strip aligned in the streamwise direction.iii. Span and streamwise chord are kept constant regardless of sweep angle.iv. Trim is not considered in this case. v. Sweep angle > 0, sweepback; Sweep angle < 0, forward sweep.Figure 1: Graph of Divergence Speed, Vdiv (m/s) vs Sweep Angle, ? (deg) Equation for Figure 2Figure 3: Graph of Divergence Speed, Vdiv (m/s) vs Flap Stiffness, K? (Nm/rad) at sweep angle = 10 (sweepback)Figure 4: Graph of Divergence Speed, Vdiv (m/s) vs Pitch Stiffness, K? (Nm/rad) sweep angle = 10 (sweepback)Figure 3: Graph of Divergence Speed, Vdiv (m/s) vs Flap Stiffness, K? (Nm/rad) at sweep angle = -10 (forward sweep)Figure 6: Graph of Divergence Speed, Vdiv (m/s) vs Pitch Stiffness, K? (Nm/rad)sweep angle = -10 (forward sweep)Figure 7: Graph of Divergence Speed, Vdiv (m/s) vs Flap Stiffness, K? (Nm/rad) at sweep angle = 0 (unsweep)Figure 8: Graph of Divergence Speed, Vdiv (m/s) vs Pitch Stiffness, K? (Nm/rad)sweep angle = 0 (unsweep)Equation for Figure 3, 4, 5, 6, 7, and 8, by altering values of K? and K?DISCUSSIONb) Effect of sweep angle on divergenc

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