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Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   JANUARY 2017 , Volume 16 , Number 10 ; Page(s) 421 To 428.
 
Paper: 

EXPERIMENTALLY INVESTIGATION ON THE VORTEX-INDUCED VIBRATION OF CIRCULAR CYLINDERS: EFFECT OF END CONDITIONS ON THE RESPONSE OF THE STRUCTURE

 
 
Author(s):  BAKHTIARI ARASH, ZEINODDINI MOSTAFA*, EHTESHAMI MAJID, TAMIMI VAHID
 
* FACULTY OF CIVIL ENGINEERING, K.N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

In recent decades, experimental studies of the vortex-induced vibration (VIV) became one of the interesting fields of science. However, a variety of assumptions and methods of experiments have led to different results in various researches. Several parameters such as mass ratio, aspect ratio, degrees of freedom, and boundary conditions affect the VIV response of a simple circular cylinder. The current paper reports and discusses the results of in-water VIV experiments on an elastically mounted rigid cylinder with various types of end conditions. This paper focusses on the effects of the end condition by attaching an endplate to a circular cylinder and the results are compared with those from a cylinder with no endplate. The Reynolds number ranges from 5.8×103 to 6.6×104. Experimental setup has also been compared and verified with some classical results of VIV. Results of current study were favorably compatible with previous researchers’ results. The experimental results show that, the end condition noticeably changes the VIV amplitude, especially in the lock-in area. Moreover, non-dimensional amplitudes shift to the higher reduced velocities when the endplate is removed. In the frequency responses, the cylinder with no endplate has lower quantities rather than the cylinder with an attached endplate. Evaluation of lift force coefficients also shows a similar pattern of effects on the nondimensional amplitude. Consequently, the excitation of the structure in the lock-in region increases when the endplate from the cylinder’s end is removed.

 
Keyword(s): VORTEX-INDUCED VIBRATION, ENDPLATE, NON-DIMENSIONAL AMPLITUDE, LIFT COEFFICIENT, PHASE SHIFT BETWEEN THE LIFT FORCE AND THE, CYLINDER’S DISPLACEMENT
 
References: 
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