In this paper, robust adaptive boundary control for a flexible marine riser with vessel dynamics is developed to suppress the riser’s vibration. To provide an accurate and concise representation of the riser’s dynamic behavior, the flexible marine riser with vessel dynamics is described by a distributed parameter system with a partial differential equation (PDE) and four ordinary differential e...

In deepwater-drilling engineering, it is necessary to disconnect the bottom equipment of lower marine-riser package from blowout preventer when encountering multi-hazard environmental factors. order reduce impact recoil on drilling platform after sudden disconnection riser, in this paper, an optimal guaranteed cost H∞ control problem considered for riser. First, a three-element mass-damper-spri...

This note addresses the stabilization problem of a marine structure (i.e. cable/riser), connected to a surface vessel at one end and to a thruster unit at the other. Here, only lateral motion is considered. Based on boundary measurements, stabilizing control laws are designed. The controllers consist only on feedback from boundary measurements. The costs are thus minimized and the spillover ins...

We study the problem of the continuous dependence of weak and strong solutions to the initial boundary value problem for multidimensional marine riser equations on the parameters of the equation. The continuous dependence of solutions on the coefficient of the effective tension, on the coefficient of the nonlinear drag, and on the coefficients of the Coriolis force is established. © 2011 Elsevi...

The optimal design of risers for castings has been the subject of numerous investigations and this paper determines the optimal dimensions when Chvorinov’s rule for solidification is obeyed by both the riser and casting and solidification time is the only constraint involved .This problem can be formulated to minimize the riser volume subject to the constraint that the riser solidification time...

А riser, which is an offshore water separation column the main difference between drilling and onshore drilling. The idea of research to calculate stressed-deformed state a riser made various materials identify technological advantages during on shelf at sea in Arctic. article result conducted Mathematica application program determine operating stresses that depend process conditions external e...

The deepwater drilling riser is a very important and vulnerable connection between an offshore platform subsea wellhead. Under some certain complex marine environment operating conditions, the may drift beyond safe limitations or be driven away rapidly. In order to protect safety of platform, personnel equipment, it necessary implement emergency disconnection riser. Since stretched under normal...