6r 



3- 



-1"- 



CROSS FLOW OSCILLATIONS 



Y/D = 0.75 



REDUCED VELOCITY, Vr = V/fnD 



! \ \ I 



ft....-6- 



6 7 



Figure 2.5 The inertia coefficient C^i, at the vibration frequency plotted against the re- 

 duced velocity V^ for Y/ D = 0.75. The data are from Sarptcaya (12) and were measured 

 in water with uniform, steady fluid motion past a cylinder oscillating normal to the flow. 

 The Coefficient C^i, was derived from the total unsteady transverse force. Lock-on oc- 

 curs near V, = 5. 



o 



o 



UJ 



o 

 cc 

 o 



u. 



>- 



Q 

 < 



OJ 



z 



3 



1.0 



0.5- 



-0.5 



CROSS FLOW OSCILLATIONS 



•. A : 



•0--0 



: ^ 



iV L 



? 5: 6 7 8 



*!' /reduced VELOCITY, Vr = V/fnD 



V° Y/D = 0.75 



-1.01- 



Figure 2.6 The "drag" coefficient Q/, at the vibration frequency plotted against the re- 

 duced velocity K, for Y/ D = 0.75. The data are from Sarpkaya (12) and were measured 

 in water with uniform, steady fluid motion past a cylinder oscillating normal to the flow. 

 The coefficient C„^ was derived from the total unsteady transverse force. Lock-on oc- 

 curs near K, = 5. 



31 



