C\J 

 Q 



_1 



UJ 



LU 

 O 

 < 



Q_ 



cn 



0.8 



0.6 



0.4 - 



0.2 - 







WAKE OSCILLATOR 

 PREDICTION 







LAt 





^ 



Id 



¥• 



SYSTEM I 



+, - NRL EXPTS, 



\\ 



^<V 



MAX 



'+"-0 



5.0 



6.0 



70 



8.0 



REDUCED VELOCITY, Vr = ;p^ 



Figure Dl Lift amplification Q/Qo ^nd cross flow displacement amplitude ¥/ D, for a spring-mounted rigid cylinder in air, 

 plotted against the reduced velocity K,. = VI f„D. 



Legend for data: 



Wake-oscillator model prediction: 

 0, speed decreasing. 



Wind tunnel measurements (i;,Jix = 0.5, Re = 500 to 900): +, speed increasing; 



160 



