Quantitative Validation of a Finite Element Model of a Knee-Thigh-Hip Complex of a 50th Percentile Male

2009 ◽  
Author(s):  
Mario Mongiardini ◽  
Chiara Silvestri ◽  
Malcolm H. Ray
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Experimental Test ◽  
Experimental Tests ◽  
Element Model ◽  
Good Match ◽  
Validation Process ◽  
Quantitative Validation ◽  
The Finite Element Model

Traditionally the validation process of FE models is carried on by visually comparing two curves, respectively from an experimental test and the numerical simulation. A more rigorous way to quantitative compare two curves in the validation process would be provided by comparison metrics. In this work the component validation of the Finite Element model of a Knee-Thigh-Hip complex was carried on by quantitatively comparing the results from the experimental tests with the corresponding numerical curves. An LSDYNA finite element model of the lower extremities was developed and the condyle, pelvis and femur and components were carefully validated using three comparison metrics. The good match.

Rotordynamics Analysis: Experimental and Numerical Investigations

2003 ◽  
Author(s):  
Jean-Jacques Sinou ◽  
David Demailly ◽  
Cristiano Villa ◽  
Fabrice Thouverez ◽  
Michel Massenzio ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Critical Speed ◽  
Experimental Tests ◽  
Element Model ◽  
Test Rig ◽  
Turbofan Engine ◽  
Rotating Structure ◽  
Vibration Problems ◽  
The Finite Element Model

This paper presents a research devoted to the study of vibration problems in turbofan application. Several numerical and experimental tools have been developed. An experimental test rig that simulates the vibrational behavior of a turbofan engine is presented. Moreover, a finite element model is used in order to predict the non-linear dynamic behavior of rotating machines and to predict the first critical speed of engineering machine. A comparison between the experimental tests and the numerical model is conducted in order to evaluate the critical speed of the rotating structure and to update the finite element model.

scholarly journals Numerical Simulation of The Response of An Underground Pipeline Connector With a Super-Large Section Under Complex Geological Conditions

2021 ◽  
Author(s):  
Long Ma ◽  
Ping Ai ◽  
ChuanSheng Xiong
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Simulation Method ◽  
Large Section ◽  
Simulation Accuracy ◽  
Numerical Simulation Method ◽  
Geological Conditions ◽  
The Finite Element Model

Abstract Aiming at the low simulation accuracy of the numerical simulation method of the joint response of the super-large section underground comprehensive pipeline gallery under the current complicated geological conditions, a numerical simulation method of the joint response of the super-large section underground comprehensive pipe gallery joint response under the complicated geological conditions based on the finite element model was proposed. According to the analysis process for the super-large section underground comprehensive pipe gallery, the viscous boundary of the comprehensive pipe gallery is determined. Additionally, by analyzing soil and structural parameters, the optimal combined dynamic boundary is used as the model boundary. The HSS model is used to describe the constitutive structure of the soil, and by improving the Goodman element to describe the contact surface of the model, the finite element model of the joint response of the comprehensive pipe gallery is constructed. Furthermore, based on the internal force balance and deformation coordination conditions, considering the influence of the deformation shape of the joint joints and the elongation of the prestressed tendons on the finite element model, the response model of the integrated pipe gallery joint is optimized. Experimental results show that the proposed method has higher numerical simulation accuracy.

Research on Surface Overpressure and Deformation of Underground Frame Beam under Internal Blast Loads

2013 ◽  
Vol 790 ◽  
pp. 391-395
Author(s):  
Tian Li ◽  
Qiao Ying Jiang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Middle Surface ◽  
Element Model ◽  
Blast Loads ◽  
Numerical Result ◽  
Set Up ◽  
Short Time ◽  
The Finite Element Model

The finite element model of a separately built one-storey underground frame was set up with software ANSYS/LS-DYNA and numerical simulation was done to study on surface overpressure and deformation of the underground frame beam under internal blast loads. It is found that the overpressure peak values on the beam end and middle surface are both much higher when the explosive is below the middle of beam and the peak on the middle surface goes up with the increment of explosive height while that on the beam end surface is not sensitive to the height. The numerical result also indicates that the soil around the frame nearly has no effect on surface overpressure of the frame beam. However, whether there is soil or not the beam deformation has much difference and the increment of the deformation is closely all the same for different soil thicknesses but under the circumstance of thicker soil the beam obtains less deformation upward in a short time after explosion.

scholarly journals Study on the Trajectory of Free-End Fiber in Jet Vortex Spinning Based on the Elastic Thin-Rod Finite Element Model of Flexible Fiber

2020 ◽  
Vol 20 (1) ◽  
pp. 43-48
Author(s):  
Chenchen Han ◽  
Weidong Gao ◽  
Lifen Chen
Keyword(s):  
Differential Equation ◽  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Mass Conservation ◽  
Element Model ◽  
Momentum Conservation ◽  
Mechanical Equilibrium ◽  
Flexible Fiber ◽  
The Finite Element Model

AbstractDuring the air flow twisting process of jet vortex spinning, the moving characteristics of flexible free-end fiber are complex. In this paper, the finite element model of the fiber is established based on elastic thin rod element. According to the air pressure and velocity distribution in the airflow twisting chamber of jet vortex spinning, this paper analyzes the undetermined coefficients of the finite element kinetic differential equation of the free-end fiber following the principle of mechanical equilibrium, energy conservation, mass conservation and momentum conservation. Based on numerical simulation, this paper gets the trajectory of the free-end fiber. Finally, the theoretical result of the free-end fiber trajectory by finite element simulating is tested by an experimental method. This paper has proposed a new method to study the movement of the fiber and learn about the process and principle of jet vortex spinning.

scholarly journals A Review of Research on Human-induced Vibration Serviceability and Dynamic Properties of Long-span Floor

2018 ◽  
Vol 38 ◽  
pp. 03012
Author(s):  
Li Lin Cao ◽  
Cheng Qian ◽  
Lan Zhe Chu ◽  
Guo Jun Yu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Field Test ◽  
Model Test ◽  
Dynamic Properties ◽  
Element Model ◽  
Long Span ◽  
Vibration Serviceability ◽  
The Finite Element Model

Studies on the dynamic properties of long-span floor is an essential basis for a solution to the problem of human-induced vibration serviceability. According to the recent research, this review introduces the application of numerical simulation in the research of dynamic properties and summarizes the modeling method of sophisticated finite element model. The reliability of the finite element model is verified by the field test and model test. Comparing the application of studies on dynamic properties among numerical simulation and model test, the differences between numerical simulation and model test are summarized. Finally, some problems that need further study are proposed.

The Numerical Simulation Research of the Dynamic Response of RC Frame Structure under the Internal Explosion

2014 ◽  
Vol 1065-1069 ◽  
pp. 2090-2094
Author(s):  
Bin Jia ◽  
Xiao Wei Zhu ◽  
Zhu Wen ◽  
Qi Jiang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Dynamic Response ◽  
Finite Element Model ◽  
Element Model ◽  
Frame Structure ◽  
Rc Frame ◽  
Simulation Research ◽  
Rc Frame Structure ◽  
The Finite Element Model

The finite element model was established in this paper to study the process of dynamic response of RC frame structure under internal explosive loading. The burst point in the model was located in the center of the frame structure .The article analyzed the process of the dynamic response of the frame structure in the explosive environment and the result of the numerical simulation accorded well with the test. The result showed that the finite element model was feasible as well as providesed reference to the design and protection for the building structure.

3-D Finite Element Simulation of Shear Spinning for Investigation of Effect of Roller Nose Radius and Feed Rate on the Reaction Forces of Roller

2010 ◽  
Author(s):  
Hamed Zoghi ◽  
Mojtaba Sayeaftabi ◽  
Alireza Fallahi Arezoodar
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Feed Rate ◽  
Experimental Tests ◽  
Element Model ◽  
Nose Radius ◽  
Explicit Finite Element ◽  
Experimental Values ◽  
Shear Spinning ◽  
The Finite Element Model

A 3-D Dynamic explicit finite element model of metal shear spinning, is developed and solved for different nose radii and feed rates. Several amounts are applied to spinning roller nose radius and feed rate, then Axial, tangential and normal forces are calculated for each combination of parameters. The results are checked with a series of experimental tests in which the process parameters are varied according to the finite element model. The experimental values are shown to be in relatively good agreement with the outcomes of the finite element model.

scholarly journals Sensitivity Analysis of the Influence of Structural Parameters on Dynamic Behaviour of Highly Redundant Cable-Stayed Bridges

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
B. Asgari ◽  
S. A. Osman ◽  
A. Adnan
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Structural Parameters ◽  
Element Model ◽  
Structural Behavior ◽  
Model Tuning ◽  
The Finite Element Model ◽  
Cable Stayed Bridges

The model tuning through sensitivity analysis is a prominent procedure to assess the structural behavior and dynamic characteristics of cable-stayed bridges. Most of the previous sensitivity-based model tuning methods are automatic iterative processes; however, the results of recent studies show that the most reasonable results are achievable by applying the manual methods to update the analytical model of cable-stayed bridges. This paper presents a model updating algorithm for highly redundant cable-stayed bridges that can be used as an iterative manual procedure. The updating parameters are selected through the sensitivity analysis which helps to better understand the structural behavior of the bridge. The finite element model of Tatara Bridge is considered for the numerical studies. The results of the simulations indicate the efficiency and applicability of the presented manual tuning method for updating the finite element model of cable-stayed bridges. The new aspects regarding effective material and structural parameters and model tuning procedure presented in this paper will be useful for analyzing and model updating of cable-stayed bridges.

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