A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Nonstationary response of floating structures to random waves
Abstract Even if ocean waves are treated as a stationary random process, dynamic responses of floating structures to random waves at the transient state are always nonstationary. When nonstationary response statistics is desired, a common technique is to apply Monte Carlo simulations; however, its implementation is costly in computational time. Analytically, this article develops an efficient method for computing nonstationary response statistics, including evolutionary power spectrum and time-varying mean-square values. Assuming a hydrodynamic software has been employed to get various frequency response functions, a prerequisite of the proposed method is to get the elevation-to-motion transfer function formulated in its pole-residue form. The proposed method is applicable to arbitrary wave spectrum and has been based on pole-residue operations implemented in the Laplace domain to obtain closed-form solutions for the response evolutionary power spectrum. Numerical examples choose a single-degree-of-freedom Spar model and a six-degree-of-freedom Floating Production Storage and Offloading model to a Pierson–Moskowitz wave spectrum, and the correctness of the computed mean-square values is verified by Monte Carlo simulations.
Highlights An analytical method to get nonstationary response statistics is proposed. The proposed method is based on efficient pole-residue operations. A closed-form solution of response evolutionary power spectrum is derived. The proposed method has been verified by Monte Carlo simulations.
Nonstationary response of floating structures to random waves
Abstract Even if ocean waves are treated as a stationary random process, dynamic responses of floating structures to random waves at the transient state are always nonstationary. When nonstationary response statistics is desired, a common technique is to apply Monte Carlo simulations; however, its implementation is costly in computational time. Analytically, this article develops an efficient method for computing nonstationary response statistics, including evolutionary power spectrum and time-varying mean-square values. Assuming a hydrodynamic software has been employed to get various frequency response functions, a prerequisite of the proposed method is to get the elevation-to-motion transfer function formulated in its pole-residue form. The proposed method is applicable to arbitrary wave spectrum and has been based on pole-residue operations implemented in the Laplace domain to obtain closed-form solutions for the response evolutionary power spectrum. Numerical examples choose a single-degree-of-freedom Spar model and a six-degree-of-freedom Floating Production Storage and Offloading model to a Pierson–Moskowitz wave spectrum, and the correctness of the computed mean-square values is verified by Monte Carlo simulations.
Highlights An analytical method to get nonstationary response statistics is proposed. The proposed method is based on efficient pole-residue operations. A closed-form solution of response evolutionary power spectrum is derived. The proposed method has been verified by Monte Carlo simulations.
Nonstationary response of floating structures to random waves
Sun, Jinwei (author) / Hu, Sau-Lon James (author) / Li, Huajun (author)
Marine Structures ; 90
2023-03-23
Article (Journal)
Electronic Resource
English
Seismic Nonstationary Random Response of Multi-Supported Structures
| British Library Conference Proceedings | 2005
Motion response of floating structures to regular waves
| Elsevier | 1980
Response of MDOF systems to nonstationary random excitation
| Elsevier | 1989
Extreme Response of Floating Structures in Combined Wind and Waves
| Online Contents | 2003
A Response Reduction Method of Large Floating Structures in Waves
| British Library Conference Proceedings | 2000