Structural Analysis for a Panamax Bulk Carrier

2008 ◽  
Author(s):  
Sandita Pacuraru-Popoiu ◽  
Paulina Iancu ◽  
Liviu I. Crudu
Keyword(s):  
Structural Analysis ◽  
Stress Distribution ◽  
Structural Integrity ◽  
Dynamic Pressure ◽  
Uniform Structure ◽  
Bulk Carrier ◽  
Element Analysis ◽  
Hull Girder ◽  
Fine Mesh ◽  
Hull Structure

This paper is devoted to the development of a structural analysis for a bulk carrier vessel. According to the CSR requirements for bulk carriers, an assessment of the hull structure using FEA (Finite Element Analysis) on a model extended over 3 cargo holds is presented. This method is used in order to assess the structural integrity of the cargo holds under the considered loads. The selected vessel is a PANAMAX bulk carrier with double hull and longitudinal uniform structure. There are three main priorities for the FE-analysis: one is to perform a fine mesh necessary to capture the stressed induced by the considered loads. The second priority is to apply the right boundary conditions in order to approach the hull girder bending and stress distribution on the cargo holds. The stress distribution is induced by the cargo weight, the hydrostatic pressure and the external water considered as dynamic pressure. The dynamic pressure was computed using an in-house code, neglecting the inertia forces induced by the ship motions and the horizontal accelerations. Also shear forces and bending moments were obtained for head angles of 0, 45 and 180 degrees.

scholarly journals Virtual Structural Analysis of Tibial Fracture Healing from Low-Dose Clinical CT Scans

2018 ◽  
Author(s):  
Peter Schwarzenberg ◽  
Hannah L. Dailey
Keyword(s):  
Structural Analysis ◽  
Fracture Healing ◽  
Bone Healing ◽  
Structural Integrity ◽  
Torsional Rigidity ◽  
Torsion Test ◽  
Ct Scans ◽  
Orthopaedic Trauma ◽  
Element Analysis ◽  
Trauma Research

Quantitative assessment of bone fracture healing remains a significant challenge in orthopaedic trauma research. Accordingly, we developed a new technique for assessing bone healing using virtual mechano-structural analysis of computed tomography (CT) scans. CT scans from 19 fractured human tibiae at 12 weeks after surgery were segmented and prepared for finite element analysis (FEA). Boundary conditions were applied to the models to simulate a torsion test that is commonly used to access the structural integrity of long bones in animal models of fracture healing. The output of each model was the virtual torsional rigidity (VTR) of the healing zone, normalized to the torsional rigidity of each patient’s virtually reconstructed tibia. This provided a structural measure to track the percentage of healing each patient had undergone. Callus morphometric measurements were also collected from the CT scans. Results showed that at 12 weeks post-op, more than 75% of patients achieved a normalized VTR (torsional rigidity relative to uninjured bone) of 85% or above. The predicted intact torsional rigidities compared well with published cadaveric data. Across all patients, callus volume and density were weakly and non-significantly correlated with normalized VTR and time to clinical union. Conversely, normalized VTR was significantly correlated with time to union (R2 = 0.383, p = 0.005). This suggests that fracture scoring methods based on the visual appearance of callus may not accurately predict mechanical integrity. The image-based structural analysis presented here may be a useful technique for assessment of bone healing in orthopaedic trauma research.

Computation of dimensional variations on the structural analysis of multi-cell aircraft box beams with python scripting

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hande Yavuz
Keyword(s):  
Structural Analysis ◽  
Shear Flow ◽  
Structural Integrity ◽  
Flow Distribution ◽  
Element Analysis ◽  
Content Type ◽  
Box Beam ◽  
Python Scripting ◽  
Box Beams ◽  
Practical Tool

Purpose Python codes are developed for the versatile structural analysis on a 3 spar multi-cell box beam by means of idealization approach. Design/methodology/approach Shear flow distribution, stiffener loads, location of shear center and location of geometric center are computed via numpy module. Data visualization is performed by using Matplotlib module. Findings Python scripts are developed for the structural analysis of multi-cell box beams in lieu of long hand solutions. In-house developed python codes are made available to be used with finite element analysis for verification purposes. Originality/value The use of python scripts for the structural analysis provides prompt visualization, especially once dimensional variations are concerned in the frame of aircraft structural design. The developed python scripts would serve as a practical tool that is widely applicable to various multi-cell wing boxes for stiffness purposes. This would be further extended to the structural integrity problems to cover the effect of gaps and/or cut-outs in shear flow distribution in box-beams.

Numerical Study on the Residual Ultimate Strength of Hull Girder of a Bulk Carrier After Ship-Ship Collision

2014 ◽  
Author(s):  
Yasuhira Yamada
Keyword(s):  
Large Scale ◽  
Numerical Study ◽  
Bending Moment ◽  
Second Step ◽  
Collapse Mechanism ◽  
Bulk Carrier ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Hull Girder ◽  
Ship Collision

The purpose of the present study is to investigate residual Ultimate Longitudinal Strength (ULS) of bulk carriers after ship-ship collision. A series of a large-scale explicit finite element analysis (FEA) as well as simplified analysis (SA) are carried out using a cape size bulk carrier. In order to accurately investigate collapse mechanism of “damaged ships” under vertical bending moment nonlinear FEA are carried out where two steps analysis is adopted. First step is ship-ship collision analysis; Second step is ULS analysis of the damaged ship. Ship-ship collision analysis is carried out assuming the right angle collision at the midship region of the struck ship, and damage extent of the struck ship is estimated with varying collision speed of 3kt, 6kt, 9kt and 12kt. In the second step of analysis, residual ULS analysis is carried out taking into account residual stress and deformation of the struck ship caused by ship-ship collision. Collapse mechanism of the bulk carrier in damaged condition due to sagging moment as well as combination of longitudinal and horizontal bending moment is investigated and discussed in detail. ULS of hull girder of the bulk carrier in intact condition is also estimated and compared with that in damaged condition. The effect of damaged condition on the reduction of ULS is discussed in detail. Finally some of numerical methodologies are summarized in assessing residual ULS of hull girder after collision.

Development of a Pile Mooring System for Large Scale FSRUs

2020 ◽  
Author(s):  
Taeyoon Park ◽  
Junhwan Jeon ◽  
Jung Kim ◽  
Sangbae Jeon ◽  
Bongjae Kim ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Pile Foundation ◽  
Large Scale ◽  
Structural Integrity ◽  
Mooring System ◽  
Basic Design ◽  
Element Analysis ◽  
Pile Resistance

Abstract In this paper, a pile mooring system is introduced as an alternative mooring solution for FSRU. Also, the methodologies of mooring analysis and structural analysis to verify a design of pile mooring system are introduced. The mooring performance of pile mooring system can be assessed by coupled mooring analysis considering stiffness of pile, resistance of soil and hull interface mechanism. The structural integrity of pile, foundation and hull interface can be assessed by non-linear contact finite element analysis. Using these methods, the basic design of pile mooring system for 160,000-CBM large scale FSRU is developed considering practical environmental conditions.

Finite Element Analysis of Fir-Tree Blade-Disc Assembly

2013 ◽  
Vol 392 ◽  
pp. 191-196
Author(s):  
Ashkan Dargahi ◽  
Mehdi Masoudi ◽  
Soheil Nakhodchi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Gas Turbines ◽  
Structural Integrity ◽  
Tolerance Analysis ◽  
Fe Model ◽  
Element Analysis ◽  
Industrial Gas Turbines ◽  
Deformable Bodies

The safe operation of industrial gas turbines is dependent on the structural integrity of the critical geometrical features such as blade-disc attachments. Knowledge of stress distribution in this region is the principal necessity for damage tolerance analysis and lifetime estimations. The finite element analysis which includes contact between two deformable bodies is complicated and takes extensive computational costs. A simplified FE model is needed which could predict the stress distribution without modeling the exact contact features. The main objective of this study is to present and compare two simplified FE models which can predict stress distribution at blade disc interface. Fir-tree region in a gas turbine disc assembly is modeled and comprehensive 2D and 3D non-linear finite element analysis is carried out. FE results are verified using photo elasticity method.

Finite Element Analysis for Analog Modes of SCS Series Truck Scale with Different Loads

2011 ◽  
Vol 201-203 ◽  
pp. 121-125
Author(s):  
Wei Tao Shi ◽  
Jian Li ◽  
Jun He
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Stress Distribution ◽  
Traditional Method ◽  
Stress And Strain ◽  
Element Analysis ◽  
Simply Supported ◽  
The Finite Element Analysis ◽  
Loading Modes

The weighing platform of the truck scale is a load-bearer, which is used for bearing a load. Its structure has many forms, in this paper, the finite element analysis of a structure with u-beam which is currently the most widely used for different loading modes, the traditional method of structural analysis of truck scale is to simplily the platform as a simply supported beam. As the model is too simplified, the result of this method will be unreliable and it cannot make part analysis about stress and strain . In this research, ANSYS was used to model, and loaded analysis. Through different loading, get the structure of weighing platform stress distribution and deformation. By analysing,we give reasonable proposals and provide valuable reference for the design and production of truck scale .

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