Front Structure Design Procedure for Optimal Pedestrian Leg Impact Performance

2004 ◽  
Author(s):  
Mark O. Neal
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Test ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Element Model ◽  
Structure Design ◽  
Baseline Design ◽  
Impact Performance ◽  
Front Structure

This paper describes a procedure to optimize the front structure of a vehicle for improved performance in the leg impact portion of pedestrian safety regulations proposed by the European Enhanced Vehicle-Safety Committee (EEVC). The first step in this procedure was to perform a simulation of the EEVC leg impact test with detailed finite element models of the EEVC leg impactor and the baseline design of a vehicle front structure. Next, a simplified, parametric finite element model of the vehicle front structure was used with the leg impactor model to simulate the leg impact test, and the results were correlated to the detailed finite element model and the test results. The leg impact simulation with the parametric vehicle model was then incorporated into an optimization procedure developed within the optimization code ISIGHT. In this procedure the parameters that controlled the vehicle geometry and structural stiffness in the simplified model were altered by ISIGHT to improve performance in the leg impact test.

Structure Statics Finite Element Model Updating Based on Response Surface Methodology

2011 ◽  
Vol 255-260 ◽  
pp. 1939-1943 ◽  
Author(s):  
Miao Yi Deng ◽  
Guang Hui Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Response Surface ◽  
Model Updating ◽  
Structural Parameters ◽  
Optimization Procedure ◽  
Element Model ◽  
Surface Model ◽  
Model Parameters ◽  
Finite Element Model Updating

Employing response surface method, the complicated implicit relationship between bridge structural static-load responses and structural parameters is approximately represented by the simple explicit function. Based on this response surface model (function), the structural finite element model parameters can be easily updated by selected optimization procedure. By a numerical example of a two-span continuous beam, the essential theory and implementation of structural static response surface based finite element model updating are presented in the paper.

Structure Design and Mechanical Analysis on a Large Spaceborne Flat Seam Antenna

2014 ◽  
Vol 543-547 ◽  
pp. 291-294
Author(s):  
Wen Jie Fan ◽  
Xiao Peng Li ◽  
Ning Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Random Vibration ◽  
Element Model ◽  
Mechanical Analysis ◽  
Structure Design

Large spaceborne flat seam antennas boom recently. The structure design of the large flat seam antenna is introduced, and finite element model is built. The first frequency of antenna is obtained from modal analysis and it meet the requirement. The results of sine vibration and random vibration shows that strength satisfy the requirement and it has a certain margin.

Assessment of Shoulder and Chest Protection of Wearable Motorcycle Airbags

2019 ◽  
Author(s):  
Davide Girardi ◽  
Edoardo Marconi ◽  
Matteo Massaro
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Test ◽  
Material Model ◽  
Element Model ◽  
Inflation Pressure ◽  
Human Body Model ◽  
Physics Simulation ◽  
Set Up ◽  
The Finite Element Model

Abstract The application of numerical simulation to wearable airbags for motorcyclists is relatively recent and only few works about this topic can be found in the literature. This research uses multi-physics simulation to analyse a new wearable airbag geometry, primarily designed to protect the shoulders of motorcycle riders, with the aim of assessing the effect of inflation pressure on the protection performance. The finite element model of the airbag employs a simple linear-isotropic material model, calibrated though the comparison between experimental and numerical outcomes of a drop test, together with the analysis of the airbag inflated geometry. The finite element model of the wearable device is then fitted to a dummy model and a human body model, in order to be used in a parametric analysis. Two set-ups are considered. The first is a thorax impact test, used to assess the effect of inflation pressure on chest protection. A modification to the bag geometry is also proposed and tested on this configuration. The second set-up is a shoulder impact test, used to assess the effect of inflation pressure on shoulder protection. In both tests an optimal inflation pressure can be found, but the maximization of shoulder protection proved more critical and should therefore drive the choice of this parameter.

Numerical Simulation of Aluminum Alloy Wheel 13° Impact Test Based on Abaqus

2012 ◽  
Vol 215-216 ◽  
pp. 1191-1196 ◽  
Author(s):  
Xiao Ming Yuan ◽  
Li Jie Zhang ◽  
Xin Ying Chen ◽  
Bing Du ◽  
Bao Hua Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Impact Test ◽  
Equivalent Plastic Strain ◽  
Element Model ◽  
Experimental Result ◽  
Alloy Wheel ◽  
The Impact ◽  
The Finite Element Model

In order to predict the result of impact test in the design phase and reduce the experimental times, which can save cost and shorten development cycle, a finite element model of aluminum alloy wheel 13-degree impact test is established based on Abaqus. All mechanical parts such as the standard impact block, the assembly of the wheel and the tire, the support and bolts are included in the finite element model. The predicted result of finite element analysis and the experimental result agree very well shows the finite element model is correct. The equivalent plastic strain value was also put forward as fracture criterion for the wheel in the impact test which realizes the transition from the qualitative analysis to the quantitative analysis in the development process of aluminum alloy wheel.

scholarly journals A Modified Eigenstructure Assignment Technique for Finite Element Model Updating

1996 ◽  
Vol 3 (4) ◽  
pp. 247-258 ◽  
Author(s):  
S. Ziaei-Rad ◽  
M. Imregun
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Mass Matrix ◽  
Linear Optimization ◽  
Numerical Test ◽  
Optimization Procedure ◽  
Element Model ◽  
Finite Element Model Updating ◽  
Eigenstructure Assignment

This article deals with an extended application of the constrained eigenstructure assignment method (CEAM) to finite element model updating. The existing formulation is modified to accommodate larger systems by developing a quadratic linear optimization procedure that is unconditionally stable. Further refinements include the updating of the mass matrix, a hysteretic damping model, and the introduction of elemental correction factors. Six numerical test cases, dealing with effects of damping and measurement noise, mode shape incompleteness, and discretization differences, were conducted in the case of a 3-D frame model with 114 coordinates. The performance of the CEAM was evaluated systematically for both the purpose of error location and the global correction of the initial model. The same cases were also studied using another model updating approach, namely the response function method (RFM). It was found that the CEAM had a number of distinct advantages, such as yielding a noniterative direct solution, requiring much less computing power, and providing acceptable results for cases, that could not he handled using the RFM.

scholarly journals Improvement design of bus structure to satisfy frontal safety

2015 ◽  
Vol 18 (4) ◽  
pp. 72-76
Author(s):  
Tam Thanh Nguyen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Structural Safety ◽  
Frontal Impact ◽  
Existing Problems ◽  
Front Structure ◽  
Simulation Testing ◽  
Bus Structure ◽  
The Finite Element Model

The finite element model of bus was developed and LS – DYNA software was used to simulate structural safety of the bus when frontal impact happens. Based on the existing problems of the bus front structure, some improving methods for the bus structure were proposed, and simulation testing was conducted. Simutaion results showed that, the bus structure to satisfy safety condition. However, the collision engergy absorption of bus front structure was designed, as a results the collision acceleration was decreased, and passengers safety were increased.

scholarly journals Development of a Computer Model for Prediction of Collision Response of a Railroad Passenger Car

Joint Rail ◽  
2002 ◽  
Author(s):  
Steven W. Kirkpatrick ◽  
Robert A. MacNeill
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Test Data ◽  
Computer Model ◽  
Impact Test ◽  
Three Dimensional ◽  
Element Model ◽  
Passenger Car ◽  
Collision Response ◽  
The Finite Element Model

The paper describes the development of a detailed finite element model that is capable of predicting the response of a rail passenger car to collision conditions. This model was developed to predict the car crush, the three-dimensional gross motions of the car, and the vertical, lateral, and longitudinal accelerations experienced by the car during collisions. The finite element model developed was for a Pioneer passenger coach car. This vehicle was used in a single car impact test. The model was then used to simulate the test and the results are compared to the test data.

scholarly journals Design of haunches in structural steel joints

2017 ◽  
Vol 23 (6) ◽  
pp. 765-772 ◽  
Author(s):  
Marta KUREJKOVÁ ◽  
František WALD
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Steel ◽  
Failure Modes ◽  
Numerical Study ◽  
Design Procedure ◽  
Element Model ◽  
Element Analysis ◽  
Simple Arrangement ◽  
Steel Joints

The paper presents research in design of haunches in structural steel joints. Experimental results of six speci­mens of haunches with and without flanges are presented. Three specimens are without flanges and three specimens are supported by additional flanges. Flanges differ in stiffness to observe the increase in haunch resistances and the effect on buckling shapes. The research finite element model (RFEA) is studied by material and geometrical nonlinear finite element analysis with imperfections under the actual stress conditions and validated on the measured experimental data. The validity is demonstrated on the comparison of load-deflection curves, failure modes, stress distributions and yield line patterns. The stability analysis of a joint with a haunch is related to the research into component based finite element models of complex joints. The input and the results of the research finite element model are summarised in a benchmark case of a haunch with a flange. A numerical study illustrates the effect of the flange stiffness on the joint’s resistance. The effect is demonstrated on a simple arrangement with triangular stiffeners and on a beam-to-column joint. The main goal of the research is to verify proposed design procedure for stiffeners in steel joints.

Simulation of Bicycle Helmet Impact Test Based on the CPSC Standard

2012 ◽  
Vol 538-541 ◽  
pp. 744-747
Author(s):  
Tso Liang Teng ◽  
Cho Chung Liang ◽  
Chien Jong Shih ◽  
Van Hai Nguyen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Test ◽  
Element Model ◽  
Test Model ◽  
Finite Element Analyses ◽  
Bicycle Helmet ◽  
Design Problems ◽  
Physical Testing ◽  
Efficient Alternative

Bike helmets must meet minimum standards of construction and materials design. This paper focuses on assessment of a helmet based on the shock absorbing test of CPSC’s standard. Computer simulation finite element model is an economical and time-efficient alternative to physical testing. By those compelling reasons, a finite element model of helmeted headform is constructed to serve for development of bicycle helmet technologies. This study performs finite element analyses of helmet impact tests using LS-DYNA software. The linear accelerations at center of gravity of the headform are measured in this simulation. This study implies that the numerical method is a practical approach to helmet design problems. Furthermore, the helmet test model proposed here has potential for guiding the future development of helmet technologies.

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