Authors : Ranjeet Kr Verma and Himanshu Uppal
Abstract: This study analyzes the non-linear dynamic behaviour and stability of Top Tensioned Riser (TTR) under combined effect of in line vortex formation and parametric excitation due to nonlinear drag term of wave motion. While analyzing the response of TTR general approach is either to neglect effect of vortex formation which is because of current flow by passing the TTR or parametric excitation because of changes in tether tension. However, in real sea conditions coexistence of both loads may produce disastrous chaotic response. In this study, mathematical model of TTR considering pinned-pinned end condition is derived and various design parameters of TTR is explored, considering vortex shedding frequency to be twice of fundamental structural frequency of TTR using Monte-Carlo Simulation.
Ranjeet Kr Verma and Himanshu Uppal, 2019. Stability Analysis of TTR under VIV and Parametric Excitation. Journal of Engineering and Applied Sciences, 14: 3885-3890.