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CES5587_Wind_Engineering PPT

# 06 msec vertical dof case f luctuating lift force at

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Unformatted text preview: ift Force at U = 11.06 m/sec (Vertical DOF Case) F luctuating Lift Force at U = 11.06 m/sec (Vertical-Torsional DOF Case) 20 L ift Force per unit length, N /m 25 4 3 2 1 0 -1 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -2 -3 -4 -5 15 10 5 0 -5 0 0.5 1 1.5 2 2.5 3 -10 -15 -20 - 25 Time, secs Time, secs F luctuating Moment at U = 11.06 m/sec (Vertical-Torsional DOF Case) 2 Moment per unit length, N-m/m Lift Force per unit length, N /m 5 1.5 1 0.5 0 -0.5 0 0.5 1 1.5 2 2.5 -1 -1.5 -2 Time, secs 3 3.5 4 4.5 5 3.5 4 4.5 5 System System Identification: Iterative Iterative Least Squares or ILS Method Experimental Results: 4 5 2 0 0 2 4 6 8 10 12 14 0 16 0 6 8 -4 A2: Pseudo-Steady Theory -6 B1: 2 DOF,V&T -15 4 -2 A1: 2 DOF,V&T -10 2 H2* H1* -5 A1: 2 DOF,V&T B1: 2 DOF,V&T B2: 2 DOF,V&T -8 B2: 2 DOF,V&T B2: Pseudo-Steady Theory -20 -10 U/fB U/fB VERTICAL FLUTTER DERIVATIVES: H1*, H2* 10 12 14 16 Iterative Iterative Least Squares or ILS Method: Experimental Results: 2 0.1 1 0 0 2 4 6 8 10 0 2 4 6 8 10 12 14 -0.1 16 P2* 0 P1* -1 -0.2 -2 A1: 2 DOF,V&L B1: 2 DOF,L&T -3 -0.3 B1: 2 DOF,V&L B1: 2 DOF,L&T B1: Pseudo-Steady Theory -4 A 2 DOF,L&T 1: -0.4 B3: Pseudo-Steady Theory B2: Pseudo-Steady Theory B3: Pseudo-Steady Theory -0.5 -5 U/fB U/fB LATERAL FLUTTER DERIVATIVES: P1*, P2* 12 14 16 Comparison Comparison of Flutter Speed and Flutter Frequency: Flutter Parameter Flutter Derivative (Frequency Domain) Experimental RFA (Time Domain) Percentage Error of Time Domain over Frequency Domain Flutter Speed, Ucr (m/sec) 22.89 22.15 3.23 % Flutter Frequency, fcr (Hz) 2.98 2.93 1.68 % Flutter F...
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