جستجوی مقالات مرتبط با کلیدواژه "رایزر دریایی" در نشریات گروه "مکانیک"

This paper presents the use of Lyapunov direct method to boundary control of the upper end of the riser so as to reduce the top angle and transverse vibration of the riser during time-varying disturbances. Two cases are taken into account for analysis. In the first case, the surface current of sea is assumed to be linearly reduced from the sea surface to the sea bed; while, in the second case, the declination is exponential. In both cases, it is assumed that the current decreases to almost zero. To address the problem, a distributed parameter system is modeled with partial differential equation constrained to boundary conditions. As all control signals can be measured using sensors and/or can be calculated using the backward difference algorithm, the boundary control has the potential to be practically implemented. The Lyapunov direct method has also been utilized for stability analysis of the closed-loop system. Eventually, the efficiency and robustness of the proposed controller is verified, and a comparison is made between the related results of linear and exponential profiles.