Stochastic response of a two DOF articulated tower

Comparison of linear and nonlinear responses of a compliant tower to random wave forces

“…This model is often used with complex fluid forcing models in order to capture the nonlinear interactions between the fluid and structure. The rigid motions in 2D and 3D were studied by Jain and Kirk [2] and Bar-Avi and Benaroya [3,4]. In the linear and nonlinear transverse models, the transverse displacement as a function of axial location is sufficient to describe the motion.…”

Non-Linear Coupled Transverse and Axial Vibration of a Compliant Structure, Part 2: Forced Vibration

“…We would like to thank our program manager Dr. Thomas Swean for his interest and "nancial support. The "rst author also would like to thank Dr. Patrick Bar-Avi and Dr. Ronald Adrezin, his predecessors, for their previous works [12,13] and early assistance. The authors are pleased to acknowledge the continued collaboration with their colleague, Professor Timothy Wei.…”

Nonlinear vibration modes of an offshore articulated tower

“…Compliant platforms are economically feasible in the offshore industry due to their reduced weight compared to fixed or conventional platforms (Bar-Avi and Benaroya, 1997;Patel and Witz, 2013). The structure does not supply resistance to horizontal forces due to wind, ocean currents or waves.…”

“…The structure does not supply resistance to horizontal forces due to wind, ocean currents or waves. However, restoring forces are provided through buoyancy, ballast, guy wires, axial piles, tendons and other devices (Haslum and Faltinsen, 1990;Sellers and Niedzweck, 1992;Bar-Avi and Benaroya, 1997;Patel and Witz, 2013). As a result of this structural concept, the natural frequencies of compliant towers are usually lower than wave excitation frequencies (Islam et al, 2009).…”