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.

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.

Rationalization of Structural Stiffness of Offshore Platform with Rocking-Wall

2013 ◽  
Vol 351-352 ◽  
pp. 923-926
Author(s):  
Gu Yue Han ◽  
Zhi Wei Jiang ◽  
Li Wu Nie ◽  
Ji Gang Zhang
Keyword(s):  
Material Properties ◽  
Offshore Platform ◽  
Wall Structure ◽  
Offshore Platforms ◽  
Structural Stiffness ◽  
Seismic Capacity ◽  
Rocking Wall

This paper presents a new offshore platform with rocking wall structure, and studies how to use the material more adequately by varying offshore platforms story rigidity. The results show that the greater the story stiffness, the more it can give full play to the material properties, as well as to improve the seismic capacity.

Numerical Simulation on Heat Dissipating Performance of New Pipe with Grid Plate

2012 ◽  
Vol 532-533 ◽  
pp. 417-421
Author(s):  
Chang Li Song ◽  
Jing Ji
Keyword(s):  
Heat Transfer ◽  
Simulation Analysis ◽  
Heat Transfer Analysis ◽  
Finite Element Software ◽  
Grid Plate ◽  
Steady State Heat ◽  
Steady State Heat Transfer ◽  
Energy Conservation Law ◽  
Optimal Diameter ◽  
Selection Of

In order to improve the pipe dissipating area, a kind of new pipe with grid plate is proposed in this paper. Based on the basic principle of heat transfer and energy conservation law, by finite element software ANSYS the simulation analysis of the steady-state heat transfer of the new pipeline is carried out, process of ANSYS modeling, loading and solving is introduced in detail, the distribution of temperature and stress for pipe with a grid plate is given, these can provide the foundation for the selection of the optimal diameter of the grid plate and transient heat transfer analysis of pipe.

Numerical Simulation Analysis for Scroll of Scroll Compressor Based on ABAQUS

2014 ◽  
Vol 488-489 ◽  
pp. 1047-1051
Author(s):  
Qing Qian Zheng ◽  
Bin Yang ◽  
Ning Chen ◽  
Hui Min Yang ◽  
Min Hu
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Thermal Deformation ◽  
Vortex Flow ◽  
Simulation Analysis ◽  
Temperature Load ◽  
Stress And Deformation ◽  
Finite Method ◽  
Abaqus Software ◽  
Main Factor

In this paper, the finite method is applied and ABAQUS software is used, the vortex flow field is loaded as boundary condition of wraps. The stress and deformation in scroll under the action of gas pressure, temperature load and both of them is analyzed, the stress distribution and deformation of wraps in different shaft rotation angles is discussed, the stress distribution and deformation discipline of wraps are also respectively obtained. The results show that the overall stress and deformation in scroll are the largest when compression chamber is moving near the vent position and the thermal deformation is the main factor of affecting the overall deformation of scroll.

Installation of Long Span Boat Landing on Float Over Platforms - A Case Study

2021 ◽  
Author(s):  
Charles John George ◽  
Cibu Varghese ◽  
Faris Ragheb Kamal
Keyword(s):  
Production Process ◽  
Energy Absorption ◽  
Arabian Gulf ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Long Span ◽  
Heavy Lift

Abstract Fixed offshore platforms are normally provided with landing platforms that enable berthing of supply vessels, crew boats etc. These landing platforms or ‘Boat landings’ are energy absorption structures provided on substructures (jackets) of offshore platforms. Their purpose is to facilitate personnel access from vessel to platforms for performing various tasks including manning the platform, its maintenance etc. Vessel also approach the platforms for providing supplies in case of a manned platform and for providing bunkers, spares etc. As such, boat landing is an integral part of offshore platform and its design and installation becomes equally important. They are preferably located at leeward direction as far as practical, to avoid accidental vessel drift into the platform. For smaller standalone offshore platforms installed with Heavy Lift Crane Vessels, boat landing is installed after the jacket is piled to seabed. Since sequence of installation of boat landing is prior to that of Topside, such installations are straightforward and without obstructions from the Topside. For the bigger accommodation, production, process platforms located in super-complex (or standalone) with topsides installed by float over method, boat landings sometimes are in the wide float over barge slots. In such cases, installation of boat landing becomes very critical due to the post installation after the Topside and associated obstructions from the Topside. This is similar or more critical than a boat landing removal / refurbishment activity carried for a brownfield project. This paper explores the challenges and associated steps adopted to execute the safe installation of these critical structures underneath a newly installed Topside. This case study details the installation of ∼300mt boat landings onto recently installed Greenfield platforms in Arabian Gulf using efficient rigging, suiting the EPC Contractors’ crane assets.

scholarly journals Investigating Vapour Cloud Explosion Dynamic Fatality Risk on Offshore Platforms by Using a Grid-Based Framework

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 685
Author(s):  
Usama Muhammad Niazi ◽  
Mohammad Shakir Nasif ◽  
Masdi Muhammad ◽  
Faisal Khan
Keyword(s):  
Risk Analysis ◽  
Well Being ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Plant Design ◽  
Maximum Increase ◽  
Fatality Risk ◽  
Dynamic Risk ◽  
Vapour Cloud ◽  
Grid Based

The reliability of petroleum offshore platform systems affects human safety and well-being; hence, it should be considered in plant design and operation in order to determine its effect on human fatality risk. Methane Vapour Cloud Explosions (VCE) in offshore platforms are known to be one of the fatal potential accidents that can be attributed to failure in plant safety systems. Traditional Quantitative Risk Analysis (QRA) lacks in providing microlevel risk assessment studies and are unable to update risk with the passage of time. This study proposes a grid-based dynamic risk analysis framework for analysing the effect of VCEs on the risk of human fatality in an offshore platform. Flame Acceleration Simulator (FLACS), which is a Computational Fluid Dynamics (CFD) software, is used to model VCEs, taking into account different wind and leakage conditions. To estimate the dynamic risk, Bayesian Inference (BI) is utilised using Accident Sequence Precursor (ASP) data. The proposed framework offers the advantage of facilitating microlevel risk analysis by utilising a grid-based approach and providing grid-by-grid risk mapping. Increasing the wind speed (from 3 to 7 m/s) resulted in maximum increase of 21% in risk values. Furthermore, the integration of BI with FLACS in the grid-based framework effectively estimates risk as a function of time and space; the dynamic risk analysis revealed up to 68% increase in human fatality risk recorded from year one to year five.

scholarly journals The new bud light steel system and the geometric shape evolution of light steel framework for COVID-19 patients appointed hospital (Huoshenshan hospital)

2020 ◽  
Vol 39 (6) ◽  
pp. 9015-9026
Author(s):  
Lilin Wang
Keyword(s):  
Simulation Analysis ◽  
Steel Structure ◽  
Model Material ◽  
Construction Process ◽  
Actual Measurement ◽  
Finite Element Software ◽  
Whole Process ◽  
Long Time ◽  
The Common ◽  
Actual Size

The light steel structure is always the common material of the movable plank house, and the new bud light steel system is the light steel system used for a long time after the earthquake. This paper discusses the mechanical system of the light steel structure of Huoshenshan hospital, which was built in ten days. In the process of building, the geometric form of roof stress has changed. In the actual structural design, the designer seldom takes the calculation of construction load into account, which is quite different from the actual construction process. So it is very important to simulate and monitor the whole process of structure installation. In this paper, the finite element software MIDAS / Gen is used for simulation analysis to ensure that the simulation analysis results are consistent with the construction process, the model material and the actual size are completely consistent, and the stress simulated by the software can meet the needs of the actual stress through the actual measurement.

Study on Vertical Wind-Induced Vibration Response for Portal Frame Structures

2011 ◽  
Vol 71-78 ◽  
pp. 3605-3609
Author(s):  
De Zhi Liang ◽  
Min Huang
Keyword(s):  
Simulation Analysis ◽  
Vertical Wind ◽  
Wind Pressure ◽  
Frame Structure ◽  
Finite Element Software ◽  
Average Wind ◽  
Portal Frame ◽  
Wind Vibration ◽  
Portal Frame Structure ◽  
The Impact

In recent years, as the portal frame’s height toward higher and the span toward wider, the influence of wind vibration becomes more and more prominent among the portal frame structure. In the design of the portal frame, there are many different opinions on whether considering the impact of the vertical wind vibration to the portal frame. This paper taking a true engineering as an example, using finite element software to establish the solid model of the portal frame structure, selecting the junction of purlin and roof as a node of imposing vertical fluctuating wind load, we made numerical simulation analysis of vertical wind vibration. The simulation results will be compared with data of the internal forces and deformation under the average wind pressure. The results showed that: vertical wind vibration has a prominent effect to the portal frame and should be considered in the design.

Design and Simulation Analysis of Steel-Truss Cantilever Structur

2012 ◽  
Vol 170-173 ◽  
pp. 3308-3311
Author(s):  
Ke Li ◽  
Jing Ji
Keyword(s):  
Carrying Capacity ◽  
Structural Design ◽  
Simulation Analysis ◽  
Steel Frame ◽  
Industrial Plant ◽  
Structural Form ◽  
Materials Selection ◽  
Finite Element Software ◽  
Cantilever Structure ◽  
Steel Truss

In combination with a industrial plant cantilever structure need be increased for meeting the technological requirements，the three kinds of structural design schemes of cantilever are considered, that is the scheme hanging on steel frame of the plant, prestressed steel frame scheme and steel truss scheme. Three kinds of structural form and materials selection are introduced. By finite element software ANSYS three kinds of schemes are analyzed, carrying capacity and deflection of members under load are acquired, by Comparison steel truss scheme is adopted. Carrying capacity and deflection of structure not only meet requirements, but also the construction is easy. This paper provides reference for resolving similar cantileve r problems in engineering.

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.

Sign in / Sign up

Export Citation Format

Share Document