Flow-Induced Vibration Fatigue Damage of A Pair of Flexible Cylinders in A Staggered Array

2021 ◽  
Vol 35 (6) ◽  
pp. 878-890
Author(s):  
Wan-hai Xu ◽  
Yu-han Li ◽  
Kun Jia ◽  
Jiang Lai
Keyword(s):  
Fatigue Damage ◽  
Flow Induced Vibration ◽  
Vibration Fatigue

Two-phase flow-induced vibration fatigue damage of tube bundles with clearance restriction

2022 ◽  
Vol 166 ◽  
pp. 108442
Author(s):  
Jiang Lai ◽  
Shihao Yang ◽  
Lingling Lu ◽  
Tiancai Tan ◽  
Lei Sun
Keyword(s):  
Fatigue Damage ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Induced Vibration ◽  
Two Phase ◽  
Tube Bundles ◽  
Vibration Fatigue

Lazy-Wave Steel Rigid Risers for FSO With Spread Mooring Anchoring System

2003 ◽  
Author(s):  
Ana Lu´cia F. Lima Torres ◽  
Enrique Casaprima Gonzalez ◽  
Marcos Donato Auler da S. Ferreira ◽  
Marcos Queija de Siqueira ◽  
Marcio Martins Mourelle ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Water Depth ◽  
Time Domain ◽  
Structural Integrity ◽  
Linear Time ◽  
Energy Content ◽  
Time Domain Analysis ◽  
Structural Behaviour ◽  
Fatigue Damage Analysis ◽  
Vibration Fatigue

Petrobras developed projects with European companies and Brazilian universities in order to study different configurations of steel risers using flexibilization elements. For the bow turret-moored FPSOs the lazy-wave configuration was considered the most adequate due to its structural behaviour and costs when compared to other configurations. A detailed study was performed by the Petrobras R&D Center to verify the structural integrity of a lazy-wave SCR (SLWR) attached to a turret-moored FPSO at a water depth of 1290 m. The results for the installed riser showed its feasibility. Petrobras continued the studies of the SLWR to verify its behaviour when connected to a FSO with a spread-mooring anchoring. This paper presents the approach and methodology adopted in Petrobras to verify the structural integrity of a SLWR attached to a FSO with spread-mooring anchoring at a water depth of 1800 m. The riser analysis was performed using the Petrobras’s in-house computer codes ANFLEX and POSFAL developed and implemented as part of projects from CENPES with “COPPE/UFRJ - The Engineering Post-Graduating Coordination of the Federal University of Rio de Janeiro”. For VIV (Vortex Induced Vibration) fatigue damage calculation SHEAR7 was used. Maximum stresses were verified through a deterministic non-linear time domain-analysis. The time-domain random nonlinear analysis was considered to be the most appropriate to be used for fatigue damage calculation due to the possibility of representing the existing non-linearities of the model and random characteristic of the environmental loading. For the fatigue damage analysis, a set of load cases that considers the bimodal / bi-directional characteristics of sea-states, probability of occurrence and energy content, was used.

Research on path planning for reducing vibration fatigue of precision equipment transportation

2021 ◽  
pp. 1-10
Author(s):  
Ying Huang ◽  
Quanmin Xie ◽  
Xingjun Wang
Keyword(s):  
Path Planning ◽  
Fatigue Damage ◽  
Shortest Path ◽  
High Reliability ◽  
Low Risk ◽  
Practical Significance ◽  
Special Equipment ◽  
Highway Transportation ◽  
Vibration Fatigue ◽  
The Relationship

Abstract This paper analyzes the safety and reliability problems of large precision instruments and equipment in highway transportation, aiming at reducing the vibration fatigue damage of equipment to the greatest extent from the perspective of road planning. Based on the dynamic response model of the equipment, the relationship between the ground spectrum response and the cumulative fatigue damage of the equipment is analyzed. Based on the method of probability and statistics, an equipment fatigue prediction model is established. Based on the study of the relationship between the roughness of pavement grade and the reliability of equipment, the low-risk path planning is proposed. This paper adapts the Dijkstra shortest path algorithm. Not only the basic information such as the length of the highway is considered, but also the road factors related to the reliability of the equipment and the environmental factors affecting the driving safety are considered. Try to avoid the adverse environment which has a great impact on the reliability of the equipment, reduce the vibration fatigue of the equipment in the process of transportation and improve the quality of transportation. Using Geographic Information System (GIS) secondary development, database, Global Positioning System (GPS) positioning and other technologies, this paper provides users with the shortest path and low-risk path planning for reference, which has a certain practical significance for highway transportation of high reliability products such as vulnerable products, precision instruments and special equipment.

Experimental Verification of Flow-Induced Vibration Fatigue of a Flexible Tube Array With and Without Strakes

2016 ◽  
Author(s):  
Michael Tognarelli ◽  
Himanshu Gupta ◽  
Alexia Aubault ◽  
Dominique Roddier
Keyword(s):  
Oil And Gas ◽  
Dynamic Performance ◽  
Computing Time ◽  
Oil And Gas Industry ◽  
Complex Problem ◽  
Practical Significance ◽  
Physical Model Test ◽  
Flow Induced Vibration ◽  
Field Station ◽  
Vibration Fatigue

The flow-induced vibration fatigue of an array of tubes is a complex problem of practical significance in the offshore oil and gas industry. Simple analytical tools for analyzing isolated tubes lack the capability of directly addressing the array problem, so they require some sort of calibration if they are to be used for this application. Computational fluid dynamics (CFD) and coupled computational fluid-structure interaction programs can also be utilized to address the problem in more detail, but at a significant cost in computing time. In either case, understanding of the phenomena is limited, and relatively little relevant data are available to verify the accuracy of these programs for this application. This paper documents a physical model test performed at the University of California-Berkeley Richmond Field Station Tow Basin with the following objectives: to improve confidence in the understanding of the dynamic performance and fatigue demand on both bare and straked tubes in an arrayed configuration; to estimate the influence of an external super-structure (e.g., the truss section of a floating truss spar platform) on the vibrations of the tubes in the array; and, to generate data for verification or calibration of state-of-the-art or emerging analysis tools. The findings provide new, useful information on both the fatigue of tubes in complex configurations and the effectiveness of suppression devices in these scenarios for fatigue mitigation.

Vibration Fatigue Behavior of 2024-T62 Aluminum Alloy Cantilever Beam under Different Vibration State

2012 ◽  
Vol 525-526 ◽  
pp. 253-256
Author(s):  
Hai Tao Hu ◽  
Yu Long Li ◽  
Jin Li Wang
Keyword(s):  
Aluminum Alloy ◽  
Natural Frequency ◽  
Cantilever Beam ◽  
Fatigue Damage ◽  
Fatigue Behavior ◽  
Cantilever Beams ◽  
Vibration State ◽  
Vibration Fatigue ◽  
Electrodynamic Shaker ◽  
Damage Rule

The vibration fatigue experiments of cantilever beam structures were performed to investigate the fatigue behavior of 2024-T62 aluminum alloy. Two types of cantilever beams with various natural frequencies under the sinusoidal excitation were investigated. The initial stress of two types of specimens were set in the same amplitude by adjusting the acceleration of electrodynamic shaker. Based on the stress history recorded by the strain gauge in fatigue test and the Miners liner cumulative damage rule, the fatigue damage of the cantilever beam was calculated. The effect of vibration state on the vibration fatigue behavior of the cantilever beam was discussed. The experiment results show that the fatigue life of the cantilever beam, of which the initial vibration state is resonance, is longer than that of non-resonance. The calculated damage results were in accord with the reduction of the natural frequency measured in experiment. The reduction of natural frequency could be used to evaluate the fatigue damage of structures.

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