Vibration Control of Offshore Platform Based on Outrigger Damping System

2013 ◽  
Vol 351-352 ◽  
pp. 1112-1116 ◽  
Author(s):  
Yu Hong Sun ◽  
Qun Niu ◽  
Li Wu Nie ◽  
Ji Gang Zhang
Keyword(s):  
Finite Element ◽  
Vibration Control ◽  
Simulation Analysis ◽  
Influencing Factor ◽  
Great Influence ◽  
Offshore Platform ◽  
Acceleration Response ◽  
Finite Element Software ◽  
Damping Effect ◽  
Ice Load

Outrigger damping system is used in JZ20-2 north high wellhead platform, making simulation analysis to the whole structure subjected to pushing ice load by finite element software ANSYS, calculating displacement and acceleration response under different length of horizontal pole and different height of damper. The height of the damper has great influence on displacement and acceleration. The damping effect of horizontal bar length has an impact on the damping system, and the main influencing factor is the damper height, and when the height is H2 the damping effect is the most ideal.

Research on Vibration Control of Offshore Platform Based on Self-Recentering Rocking Wall

2014 ◽  
Vol 610 ◽  
pp. 173-177
Author(s):  
Ji Gang Zhang ◽  
Qun Niu
Keyword(s):  
Simulation Analysis ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Nodal Displacement ◽  
Finite Element Software ◽  
Ice Load ◽  
Wall Stiffness ◽  
Earthquake Load ◽  
Rocking Wall ◽  
Main Factor

Self-recentering rocking wall is used in JZ20-2 north high wellhead platform, making simulation analysis to the whole structure subjected to ice load and earthquake load by the finite element software ANSYS, then analyses the nodal displacement and acceleration responses under the condition of different platform rocking wall stiffness, different floating box’s location, different buoyancy case. The results show that stiffness is the main factor affecting the seismic performance of offshore platforms, floating box can effectively reduce the dynamic response of offshore platform.

scholarly journals Sub-impacts of simply supported beam struck by steel sphere—part II: Numerical simulations

2017 ◽  
Vol 9 (1) ◽  
pp. 168781401668335
Author(s):  
Xiaoli Qi ◽  
Xiaochun Yin
Keyword(s):  
Finite Element ◽  
Numerical Simulations ◽  
Great Influence ◽  
Element Model ◽  
Theoretical Expression ◽  
Curvature Radius ◽  
Steel Sphere ◽  
Impact Time ◽  
Finite Element Software ◽  
Contact Impact

This part of the article describes numerical simulations of the problem investigated experimentally. A three-dimensional finite element model of elastic–plastic for sphere falling on beam has been implemented using the nonlinear dynamic finite element software LS-DYNA. From the numerical simulations, it was found that the LS-DYNA is suitable to study complex sub-impact phenomenon, and good agreement is in general obtained between the simulation and experimental results. The numerical simulations show that the initial impact velocity, equivalent elasticity modulus, contact curvature radius of the sphere, and equivalent mass have great influence on the contact–impact time of the sub-impact, and an applicable range of the theoretical expression of contact–impact time of the sub-impact was determined. In addition, the numerical simulations demonstrate the ratios of maximum amplitudes of the first-, second-, and third-order vibrations to the maximum amplitudes of the beam vibrations, and the phase angle of the first-order vibration will change suddenly when the sub-impacts occur. Furthermore, the occurrence conditions of the sub-impacts were clarified numerically. It was found that the occurrence conditions of the sub-impacts can be represented by a mass ratio threshold, and the thickness or length of the beam has also a great influence on the occurrence of the sub-impacts. Once the sub-impacts occur, which would result in an uncertain behavior of the apparent coefficient of restitution.

Calculation and Analysis of Reinforced Concrete Continuous Box-Girder Overpass

2011 ◽  
Vol 101-102 ◽  
pp. 463-466
Author(s):  
Dong Yu Ji
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Great Influence ◽  
Distribution Law ◽  
Box Girder ◽  
Common Structure ◽  
Element Simulation ◽  
Stress And Deformation ◽  
Calculation Software

Reinforced concrete continuous box-girder overpass is a common structure form, Wangzhuang overpass is example, this paper adopts universal finite element calculation software to carry out finite element simulation analysis for reinforced concrete continuous box-girder overpass. Considering the influence of overpass structure weight and driveway load, the distribution law of overpass stress and displacement were researched. Analysis results show that, load’s short-term effect combination has great influence on overpass structure, driveway slanting load’s influence on overpass structure’s stress and deformation can not be ignored.

Three Dimensional Finite Element Analysis of Reinforced Concrete Rectangular-Sectioned Aqueduct

2013 ◽  
Vol 644 ◽  
pp. 358-361
Author(s):  
Dong Yu Ji
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Element Analysis ◽  
Finite Element Software ◽  
Operating Process ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper adopts general finite element software to carry out three-dimensional finite element simulation analysis for Huizeli reinforced concrete rectangular-sectioned aqueduct. Considering four combination cases in aqueduct’s construction and operating process, researching variation laws of the aqueduct’s stress and displacement. Analysis results show that design scheme of Huizeli reinforced concrete rectangular-sectioned aqueduct is reasonable, it can meet design requirements. Analysis results provide some theory references for design of reinforced concrete rectangular-sectioned aqueduct.

MECHANICAL SIMULATION AND ELECTROCHEMICAL CORROSION IN A BURIED PIPELINE WITH CORROSION DEFECTS SITUATED IN PERMAFROST REGIONS

2020 ◽  
pp. 2150002
Author(s):  
XIAOLI LI ◽  
LI CHEN ◽  
XIAOYAN LIU ◽  
YU ZHANG ◽  
LIFU CUI
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Simulation Analysis ◽  
Electrochemical Corrosion ◽  
Frost Heave ◽  
Buried Pipeline ◽  
Mechanical Coupling ◽  
Finite Element Software ◽  
Corrosion Defects ◽  
Permafrost Regions

The geological environment along a buried pipeline in permafrost regions is complex, where differential frost heave often occurs. To understand the changes in the stress behavior of pipeline structures caused by corrosion while laying them in permafrost regions, we established a thermo-mechanical coupling model of buried pipeline with corrosion defects by using finite element software. Numerical simulation analysis of buried pipeline was conducted. The effects of the frost heave length, the length of the transition section, the corrosion depth, and the corrosion length on the stress displacement were obtained. These analyses showed that the stresses and displacements of the pipeline with corrosion defects in permafrost regions can be simulated by using the finite element software numerical simulation method. Afterward, the corrosion resistances of pipelines with different corrosion lengths and depths were investigated via an electrochemical testing method. These results can provide some useful insights into the possible mechanical state of buried pipeline with regard to their design and construction, as well as some useful theoretical references for simulating real-time monitoring and safety analysis for their operation in permafrost regions.

A MIDAS Simulation Analysis of a Pile Cap’s Pipe Cooling Technology

2014 ◽  
Vol 614 ◽  
pp. 124-127
Author(s):  
Meng Kai Lin ◽  
Hai Lian Li
Keyword(s):  
Field Theory ◽  
Finite Element ◽  
Temperature Field ◽  
Temperature Difference ◽  
Simulation Analysis ◽  
Hydration Heat ◽  
Finite Element Software ◽  
Cooling Method ◽  
Pile Cap ◽  
Cooling Technology

Taking the concrete pouring for a passenger station’s pile cap as the research background, the paper establishes a model of pile cap’s hydration heat, by using the finite element software MIDAS. The paper also studies the main parameters and the temperature field theory which affect the hydration heat. It indicates that the pipe cooling method can significantly reduce the temperature difference between the inside and the outside when pouring massive concretes, and it is an effective way to prevent the generation of cracks.

Research on Monitoring Technology of Long-Span Prestressed Concrete Construction

2012 ◽  
Vol 170-173 ◽  
pp. 3145-3152
Author(s):  
Ji Liang Liu ◽  
Ming Jin Chu ◽  
Shu Dong Xu ◽  
Ying Ying Yin
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Simulation Analysis ◽  
Reference Value ◽  
Element Model ◽  
Construction Process ◽  
Finite Element Software ◽  
Prestressed Concrete Beam ◽  
Comprehensive Service

The author performs simulation analysis on construction process of roofing prestressed concrete beam of comprehensive service center in Beijing Institute of Civil Engineering and Architecture by finite element software Midas/Gen, so as to determine the monitoring programme according to the analysis results. The monitoring results indicate that the structure is safe; the theoretical value of simulation analysis is well matched with actual monitoring value, which means that the finite element model of construction process of roofing prestressed concrete beam is correct, the simulation method is feasible and the construction process is reasonable. It has important reference value for construction and monitoring of subsequent similar projects.

Force Analysis of Reinforced Concrete U-Shaped Beam-Supported Aqueduct

2013 ◽  
Vol 394 ◽  
pp. 381-384
Author(s):  
Ke Ding Liu
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Shaped Beam ◽  
Finite Element Software ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Design Requirements ◽  
Three Dimensional Finite Element

This paper adopts general finite element software to carry out three-dimensional finite element simulation analysis for Sunjiagou reinforced concrete U-shaped beam-supported aqueduct. Considering five combination cases in aqueducts construction and operational process, researching variation laws of the aqueducts stress and displacement. Analysis results show that design scheme of Sunjiagou reinforced concrete U-shaped beam-supported aqueduct is reasonable, it can meet design requirements. Analysis results provide some theory references for design of reinforced concrete U-shaped beam-supported aqueduct.

Thermal Stresses Simulation Analysis of Concrete Box Water Bridge under the Solar Radiation

2011 ◽  
Vol 255-260 ◽  
pp. 952-956
Author(s):  
Jian Ping Sun ◽  
Jian Ping Chen ◽  
Gang Li
Keyword(s):  
Finite Element ◽  
Tensile Strength ◽  
Solar Radiation ◽  
Thermal Stresses ◽  
Simulation Analysis ◽  
Water Bridge ◽  
Finite Element Software ◽  
Steel Bar ◽  
Calculation Results ◽  
The Difference

The reasons why the producing of the difference in temperature distributing and thermal stresses of box aqueduct under solar radiation are analyzed. The difference in temperature distributing and thermal stresses are effectively simulated by the finite element software ANSYS.The calculation results indicate that concrete box aqueduct body inter-surface whatever along the longitudinal and transverse will produce considerable thermal stresses under solar radiation, and its value has exceeded the design of concrete tensile strength. Therefore, the thermal stresses under the solar radiation must be considered in the design of box aqueduct body structural. We should appropriately configure temperature reinforcing steel bar.

Analysis of Bridge Pier’s Dynamic Characteristics Considering Fluid-Solid Interface Coupling

2014 ◽  
Vol 1049-1050 ◽  
pp. 464-468
Author(s):  
Chen Hui Jin ◽  
Bo Ming Zhao ◽  
Run Bo Bai
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Great Influence ◽  
Water Structure ◽  
Natural Vibration Frequency ◽  
Finite Element Software ◽  
Interface Coupling ◽  
Solid Interface ◽  
Calculation Results

In the study of bridge pier’s dynamic characteristics, the modal analysis is the foundation of other dynamic analysis and is of great significance for studying other dynamic performance. Based on the dynamic theory of fluid-solid interface coupling, a 3D water-structure coupling finite element modal is established and computed by ANSYS. To verify the validity of the calculation results, the results of finite element software is compared with the analytical solutions in reference books. The analysis indicated that the results of finite element software are reasonable when the radius of bridge pier is five times the radius of water body. The ratio of water depth and the bridge pier’s height has a great influence on the change scale of bridge pier’s frequency. With the increase of bridge pier’s height-diameter ratio, the first three order natural vibration frequency is reduced.

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