Offshore engineering

2004 ◽  
pp. 361-412
Keyword(s):  
Offshore Engineering

Recursive Simulation of Stationary Multivariate Random Processes—Part II

1987 ◽  
Vol 54 (3) ◽  
pp. 681-687 ◽  
Author(s):  
P. D. Spanos ◽  
M. P. Mignolet
Keyword(s):  
Earthquake Engineering ◽  
Random Processes ◽  
Wind Engineering ◽  
Time Lags ◽  
General Criterion ◽  
Offshore Engineering

Stability and invertibility aspects of the AR to ARMA procedures developed in Part I in connection with simulation of multivariate random processes are addressed. A general criterion is proved for this purpose. Furthermore, several properties regarding the matching of the correlations at various time lags of the target and the simulated processes are shown. Finally, the reliability and efficiency of the discussed procedures are demonstrated by application to spectra encountered in earthquake engineering, offshore engineering, and wind engineering.

Mechanical Behaviors of Steel Strip Reinforced Flexible Pipes Under Bending

2018 ◽  
Author(s):  
Shan Jin ◽  
Shuai Yuan ◽  
Ting Liu ◽  
Peihua Han ◽  
Yong Bai
Keyword(s):  
Steel Strip ◽  
Practical Application ◽  
Pure Bending ◽  
Flexible Pipe ◽  
Four Point Bending ◽  
Offshore Engineering ◽  
Flexible Pipes ◽  
Proposed Model ◽  
Composite Pipe ◽  
Good Coincidence

Steel strip reinforced flexible pipe (SSRFP) is a kind of unbonded composite pipe, which has more application foreground in offshore engineering due to its excellent mechanics and the considerable flexibility. In practical application, SSRFP will inevitably experience bending during reeling process and installation. In this paper, the mechanical behavior of SSRFP subjected to pure bending are studied both experimentally and numerically. A four-point bending equipment is utilized to conduct the full-scale laboratorial tests of SSRFP. Furthermore, the commercial software ABAQUS is employed to simulate its ovalization instability. The results acquired from the ABAQUS simulation are compared with the ones from verification bending experiment, which are in good coincidence with each other. The proposed model and the relative results may be of interest to the manufacture factory engineers.

scholarly journals Application of the Newmark Analysis Method in Stability Evaluation of Submarine Slope

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Hongxian Chu ◽  
Yongcai Feng ◽  
Huijie Shi ◽  
Liancheng Hao ◽  
Yiqi Gao ◽  
...  
Keyword(s):  
Peak Ground Acceleration ◽  
Time History ◽  
Stability Evaluation ◽  
Analysis Method ◽  
Tangshan Earthquake ◽  
Ground Acceleration ◽  
Engineering Construction ◽  
Submarine Slope ◽  
Offshore Engineering ◽  
History Analysis

The Newmark seismic time-history analysis method can take into account the effects of natural seismic peak ground acceleration (PGA), duration, and seismic frequency; seismic wave can be input into the method for simulation. This study calculates the dynamic response of the typical seabed slope of Caofeidian in the event of a similar Tangshan earthquake, and the displacement value can be used to quantitatively reflect the influence of the earthquake on the slope of the site. The allowable displacement value of the top of buildings or submarine slope can be used as a marker of security and stability analysis, which can further provide important reference for similar slope stability evaluation and offshore engineering construction.

scholarly journals On the Assessment of Numerical Wave Makers in CFD Simulations

2019 ◽  
Vol 7 (2) ◽  
pp. 47 ◽  
Author(s):  
Christian Windt ◽  
Josh Davidson ◽  
Pál Schmitt ◽  
John Ringwood
Keyword(s):  
Test Cases ◽  
Cfd Simulations ◽  
Wave Tank ◽  
Free Surface Waves ◽  
Offshore Engineering ◽  
Engineering Problems ◽  
Computational Fluid Dynamics Cfd ◽  
Single Method ◽  
Wave Maker ◽  
Numerical Wave

A fully non-linear numerical wave tank (NWT), based on Computational Fluid Dynamics (CFD), provides a useful tool for the analysis of coastal and offshore engineering problems. To generate and absorb free surface waves within a NWT, a variety of numerical wave maker (NWM) methodologies have been suggested in the literature. Therefore, when setting up a CFD-based NWT, the user is faced with the task of selecting the most appropriate NWM, which should be driven by a rigorous assessment of the available methods. To provide a consistent framework for the quantitative assessment of different NWMs, this paper presents a suite of metrics and methodologies, considering three key performance parameters: accuracy, computational requirements and available features. An illustrative example is presented to exemplify the proposed evaluation metrics, applied to the main NWMs available for the open source CFD software, OpenFOAM. The considered NWMs are found to reproduce waves with an accuracy comparable to real wave makers in physical wave tank experiments. However, the paper shows that significant differences are found between the various NWMs, and no single method performed best in all aspects of the assessment across the different test cases.

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