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Modelling and Control of Flow Induced Vibration of Top–Tensioned Marine Risers Using Analytical Methods

Ajayi, O. O. and Agarana, M. C. and Adeniyi, M.O and Ogbonnaya, Mercy (2017) Modelling and Control of Flow Induced Vibration of Top–Tensioned Marine Risers Using Analytical Methods. Procedia Manufacturing, 7. pp. 609-615. ISSN 2351-9789

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For a riser array in deep waters, interference between individual risers in strong ocean current is of operational concern and thereby a key design issue. The lateral deflection is likely to be large, and the risers may experience collision with fatigue or coating damage as a consequence. In this paper, active control of flexible marine riser angle and the reduction of flow induced (forced) vibration under a time varying distributed load were considered using boundary control approach. A torque actuator was introduced in the upper riser package and a boundary control was designed to generate the required signal for riser angle control and vibration reduction with guaranteed closed-loop stability. The design is based on the partial differential equations of the system, which are developed using energy principle. Analytical method of solution was deployed with the aid of a program, developed within the framework of MATLAB, to predict the riser's behaviour by top tensioning. A sensitivity analysis for different values of the control variables was carried out. The results of this work showed that active control of flexible marine riser by top-tensioning reduced flow induced vibration.

Item Type: Article
Uncontrolled Keywords: Modelling; Flow induced Vibration; Top-Tensioned Marine Risers; Analytical Methods
Subjects: Q Science > QA Mathematics
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Mathematics
Depositing User: Ms Ugwunwa Esse
Date Deposited: 16 Jun 2017 14:10
Last Modified: 16 Jun 2017 14:10

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