Bistable Compliant Extension Aid for a Polycentric Prosthetic Knee

2009 ◽  
Author(s):  
Adam D. Roetter ◽  
Craig P. Lusk ◽  
Rajiv Dubey
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stable Equilibrium ◽  
Sitting Position ◽  
Element Analysis ◽  
Sitting Posture ◽  
Prosthetic Knee ◽  
Stable Equilibrium Position ◽  
Design Requirements ◽  
Prosthetic Knees

A compliant add-on mechanism for polycentric prosthetic knees was designed to provide two additional features beyond those already provided by the knee, the additional features being a stable equilibrium position when the knee is bent for the sitting posture and a moment-rotation profile that helps prevent excessive heel rise. The mechanism, dubbed the Bistable Compliant Extension Aid (BCEA), was developed and analyzed using finite-element-analysis (FEA) software. The BCEA was shown to satisfy the design requirements, prevention of excessive heel rise and providing a stable sitting position, based on its reaction moments for knee flexions ranging between 0 and 90 degrees.

Standardized Foundations Database for Combat Systems

2014 ◽  
Author(s):  
M. Harbison ◽  
W. Koon ◽  
V. Smith ◽  
P. Haymon ◽  
D. Niole ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cost Savings ◽  
Ship Design ◽  
Separate Analysis ◽  
Element Analysis ◽  
Weapon Systems ◽  
System Requirements ◽  
Design Requirements ◽  
The Cost

As a result of enhanced performance and mission requirements for Navy ships, ship design has dramatically increased the use of higher strength, lightweight steels and various local reinforcements, e.g., deck inserts, ring stiffeners, etc., in foundation designs to satisfy the design requirements for supporting machinery, consoles, and weapon systems among others. In additional to operational loading requirements, most of these foundations must also be designed to satisfy shock, vibration and other combat system requirements. While the same piece of equipment may be used in other ship contracts, the foundations are uniquely designed and require a separate analysis and drawing package. Computer modeling and Finite Element Analysis (FEA) have helped reduce the labor required to analyze foundations, but the high number of “unique” foundations as well as changes which necessitate a new analysis still create a large workload for engineers. This is further compounded by increased costs in production due to greater numbers of unique parts and materials that must be marked, stored, and retrieved later for fabrication. This goal of this project was to determine the cost-savings potential of leveraging past foundations work in designing, analyzing, and drawing foundations in the future. By the project’s conclusion Ingalls will have created a database for rapid access to previously-generated foundation information, the framework of which will be publicly available for all shipyards to populate with their own foundation information.

Estimation of Spring-Back of Single Torus Inner Vessel Sector by Finite Element Analysis

2016 ◽  
Vol 852 ◽  
pp. 588-594
Author(s):  
Gagan Gupta ◽  
V. Balasubramaniyan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Technology Development ◽  
Cold Pool ◽  
Spring Back ◽  
Element Analysis ◽  
Finite Element Software ◽  
Reactor Assembly ◽  
Design Requirements ◽  
Inner Vessel

Inner vessel in reactor assembly of sodium cooled fast reactor separates hot and cold pool sodium. The shape of inner vessel is optimized with reduced upper & lower shell diameters and toroidal redan for future Fast Breeder Reactor (FBR). This results in higher buckling strength and reduced thickness and hence reduced weight. To achieve the intricate toroidal shape with specified dimensional tolerances, a comprehensive technology development exercise was carried out successfully for the manufacture of inner vessel 30° sector. The achieved profile of the redan meets the specified dimensions and other design requirements. Spring-back observed in the sector was small. To verify the developmental exercise results, a finite element analysis (FEA) of forming of inner vessel sector was performed on finite element software ABAQUS. In this paper, FEA results and spring back are discussed. Spring back assessed is maximum at the center and relatively lower towards the edges for the redan with the chosen radius of 5980 mm.

Finite Element Analysis of 6-Wing Synchronous Rotor in the Mixing Process

2012 ◽  
Vol 271-272 ◽  
pp. 1291-1295
Author(s):  
Cai Jun Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Mixing Process ◽  
Element Analysis ◽  
Strain Stress ◽  
Design Requirements ◽  
Element Method

By use of finite element method to analyze the strength of 6-wing synchronous rotor, and illustrate the change of parameters regarding strain, stress and displacement etc. so as to visually see whether the designed rotor will reach the design requirements; meanwhile, through structural analysis, to provide guidance for the further optimization of designing for 6-wing synchronous rotor.

Design and Finite Element Analysis of Corrugated Plate Boarding Bridge

2010 ◽  
Vol 97-101 ◽  
pp. 3727-3730
Author(s):  
Wen Hui Wei ◽  
Yan Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Analysis Software ◽  
Element Analysis ◽  
Design Requirements ◽  
Strength And Stiffness ◽  
Stress And Deformation ◽  
Element Method

With ANSYS finite element analysis software, finite element method is used to analyze the steel corrugated plate boarding bridge. Stress and deformation of the structure are obtained, and strength and stiffness are checked. Improvements are made on this basis to meet the design requirements.

Some Recent Developments in Pressure Vessel Design by Analysis

1994 ◽  
Vol 208 (1) ◽  
pp. 23-29 ◽  
Author(s):  
D Mackenzie ◽  
J T Boyle ◽  
J Spence
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Limit Analysis ◽  
Pressure Vessel ◽  
Significant Problem ◽  
Code Design ◽  
Element Analysis ◽  
Stress Classification ◽  
Recent Developments ◽  
Design Requirements

Stress classification is a significant problem in pressure vessel design by analysis, especially if the design is based on solid finite element analysis. Stress categorization may be circumvented if the design is based on elastic-plastic or limit analysis but the degree of difficulty commonly associated with these types of analysis makes this approach unattractive to many designers. In this paper, a brief survey of a number of recent developments in pressure vessel design by analysis is discussed and assessed in light of Code design requirements.

K-Type, Inverse K-Type and X-Type Legs Stability Analysis of Jack-Up Offshore Platform

2013 ◽  
Vol 312 ◽  
pp. 205-209
Author(s):  
Wen Xian Tang ◽  
Jun Cao ◽  
Jian Zhang ◽  
Chao Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Offshore Platform ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Design Requirements ◽  
The Stability ◽  
Jack Up ◽  
Survival Condition

The force situation of truss legs has an important impact on the jack-up offshore platform. The finite element analysis on three types truss leg was made, and the stability of the three types truss leg under preload, operating and storm survival condition was discussed. The result showed that the maximum stress was in the chord; they met the design requirements; K type, inverse K type can save material, and they both met resonance requirements. The former had a better stability under preload condition, and the later had the best stability under operating, storm survival condition.

Parametric Modeling and Finite Element Analysis of the Extruder Key Components Based on Pro/E and ANSYS

2012 ◽  
Vol 466-467 ◽  
pp. 572-576
Author(s):  
Hong Li Wang ◽  
Yue Shao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimal Design ◽  
Stress Analysis ◽  
Parametric Design ◽  
Parametric Modeling ◽  
Element Analysis ◽  
Design Requirements ◽  
Design Software

The extruder key components consist of extrusion-screw, sleeve and nozzle. Its structure and size decides extrusion effects of the extruder, even to the capability of the whole machine. In this paper, the 3D entity modeling of the extruder key components were established by using the parametric design software of Pro/Engineer, then it was transferred into data that will be used in finite element analysis. The stress analysis was carried out by ANSYS which software of finite element analysis. The results showed that strength of the extrusion-screw, sleeve and nozzle meet the design requirements. Parametric modeling and finite element analysis was the effective way for optimal design of the extruder.

Design and Simulation Analysis for Power Plant Coal Storage Bunker Girder Structure

2013 ◽  
Vol 706-708 ◽  
pp. 488-491
Author(s):  
Hong Mei Fan ◽  
Yun Xu Shi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Power Plant ◽  
Simulation Analysis ◽  
Secondary Beam ◽  
Analysis Software ◽  
Element Analysis ◽  
Main Structure ◽  
Design Requirements

The structure of the closed square storage bunker main, secondary beam are designed in detail, and has carried on the simulation using finite element analysis software ANSYS, results show that the main structure of the design to meet the design requirements.

Finite Element Analysis and Optimal Design of Frictional Roller

2013 ◽  
Vol 300-301 ◽  
pp. 221-224
Author(s):  
Qing Rui Meng ◽  
Zhi Peng Hu ◽  
Jie Quan
Keyword(s):  
Finite Element Analysis ◽  
Sensitivity Analysis ◽  
Finite Element ◽  
3D Model ◽  
Structure Parameters ◽  
Element Analysis ◽  
Finite Element Software ◽  
Design Requirements ◽  
Stress And Deformation ◽  
Ansys Workbench

First a 3D model for frictional roller of endless-rope winch was established with Pro/E software. And then the model was imported into finite element software named ANSYS Workbench, by which, the stress and deformation distribution of frictional roller could be acquired after meshing and loading. Next by making use of the Design Explorer module of ANSYS Workbench software, the paper analyzed the sensitivity of the major structure parameters which influence the roller strength. On the foundation of sensitivity analysis, these parameters were optimized to make the structure of the frictional roller more reasonable and meeting the design requirements.

Influences of Varus Tilt on the Stresses in Human Prosthetic Knee Joint

2016 ◽  
Vol 823 ◽  
pp. 143-148 ◽  
Author(s):  
Dan Calafeteanu ◽  
Daniela Tarniţă ◽  
Marius Catana ◽  
Dan Tarnita
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Knee Joint ◽  
Knee Prostheses ◽  
Element Analysis ◽  
Human Knee ◽  
Prosthetic Knee ◽  
Ansys Simulation ◽  
Human Knee Joint ◽  
Total Knee

In this paper the effects of varus tilt on contact stresses in the three components of total knee prostheses using 3D finite element analysis were investigated. Using Ansys simulation environment, six complex virtual models of human knee joint–prosthesis assembly obtained for six different varus tilts which increase from 176o to 191o, with an increment of 3o have been subjected to finite element analysis in order to obtain the stress maps and total displacements maps.

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