Vibration Absorber Technology and Conceptual Design of Vibration Absorber for TLP in Ultradeep Water

Abstract

Vibration absorber technology can be used to change the TLP’s resonant behavior and make the TLP performance basically independent of the water depth, allowing a TLP to be a technically acceptable solution for field developments in water depths exceeding 6000 ft and making the TLP an ideal structure to support multiple risers in ultra deep waters, particularly under harsh environmental conditions. Vibration absorber technology for the TLP consists of several vertical caissons partially filled with water and a sealed air chamber near the top capped at the top. A throttle plate is present between the air chambers to dissipate energy. The implementation of a vibration absorber into the TLP hull is discussed. The performance of a single vibration absorber is investigated using CFD, and the results is compared with experimental findings. A discussion is provided regarding the comparative cost of a deep water TLP solution with vibration absorbers and a spar and semi submersible.

A New Energy-Absorbing Device for Motion Suppression in Deep-Sea Floating Platforms

“…Researchers have proposed various devices to control the vibration of a floating platform. Vibration-induced vertical motion of TLPs can be balanced by using absorbers with air springs [9][10][11]. Zhu et al [12] and Ou et al [13] proposed the Moveable Heave Plate (MHS) to simulate the mooring damping system to suppress the heave motion of a semi-submersible platform.…”

The effect of an orifice plate with different orifice numbers and shapes on the damping characteristics of a dual-chamber air spring

“…Additionally, Jing et al [10,11] proposed a method of nonlinear characteristic output spectrum (nCOS) to effectively solve the issue of air springs in a nonlinear vehicle suspension system based on the Volterra series expansion system principle. Rijken, Bian, Spillane, et al [12][13][14] investigated the adoption of a vibration-absorbing system composed of a dual-chamber air spring and a liquid column to suppress the resonant response of a marine platform. They investigated the influence of a circular orifice ratio on the structural damping.…”

The Stiffness and Damping Characteristics of a Dual-Chamber Air Spring Device Applied to Motion Suppression of Marine Structures

“…Dual-chamber air springs are an effective energy-absorbing device used as a key component for vibration isolation. Rijken, Bian, and Spillane et al [13][14][15] applied a system of vibration absorbers using dual-chamber air springs and water columns to suppress resonant motions and studied the effects of the orifice ratio for structural damping. Bachrach and Rivin [16] studied the complex dynamic stiffness of the damper spring, a function of the excitation frequency.…”