Automobile Hood/Fender Design Optimization for Improved Pedestrian Head Impact Protection

1994 ◽  
Author(s):  
David R. Lemmon ◽  
Ronald L. Huston
Keyword(s):  
Finite Element ◽  
Head Injury ◽  
Structure Design ◽  
Head Impact ◽  
Design Parameters ◽  
Head Injury Criterion ◽  
Dynamic Finite Element ◽  
Automobile Hood ◽  
Impact Protection ◽  
Related Design

Abstract This paper presents procedures for automobile structure design to reduce head injury of pedestrians struck by the vehicle. The fender and hood seam of a 1988 Ford Taurus are modified to absorb the energy of a head impact. Two shape related design parameters are optimized for minimum Head Injury Criterion using finite element simulations. A design is presented which reduces Head Injury Criterion by over 50 percent. All analyses are conducted using the explicit, nonlinear, dynamic finite element code DYNA3D on a Cray YMP/832 supercomputer.

scholarly journals Head Injury Reduction in Automobile Pedestrian Impact

1994 ◽  
Vol 1 (6) ◽  
pp. 559-568
Author(s):  
David R. Lemmon ◽  
Ming-yi Wu ◽  
Ronald L. Huston
Keyword(s):  
Finite Element ◽  
Head Injury ◽  
Nonlinear Dynamic ◽  
Finite Element Program ◽  
Injury Reduction ◽  
Head Injury Criterion ◽  
Dynamic Finite Element ◽  
Element Program ◽  
Automobile Hood ◽  
Pedestrian Impact

This article presents and discusses automobile hood/fender rail design to reduce head injury of pedestrians struck by the front of the vehicle. Fender seam designs are presented that reduce the head injury criterion values by over 50%. The procedures and analysis are conducted using a nonlinear dynamic finite element program for an Oldsmobile Ciera hood and a Ford Taurus hood/fender.

scholarly journals Methodology for scaling finite element dummy and validation of a Hybrid III dummy model in crashworthiness simulation

2019 ◽  
Vol 2 (SI2) ◽  
pp. SI105-SI113
Author(s):  
Lý Hùng Anh ◽  
Dinh Bao Nguyen ◽  
Anh Huy Nguyen
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Head Injury ◽  
Automobile Industry ◽  
Real Life ◽  
Crash Test ◽  
Brain Concussion ◽  
Head Injury Criterion ◽  
Hybrid Iii ◽  
Pedestrian Crashes

For study of car-pedestrian crashes, it is two common methods that can be employed: conducting crash tests with mechanical dummies and simulating car crashes on computer. The former is a traditional way and gives good results compared with real life car impact; however, its disadvantage is very expensive test equipment and generally more time-consuming than the latter because after every crash test, experimental vehicles as well as dummies need repairing to be ready for the next experiments. Therefore, crash test simulation using finite-element method is more and more popular in the automobile industry because of its feasibility and cost saving. The majority of finite element dummy models used in crash simulation. Particularly, it is popular to use Hybrid III 50th dummy model which is built based on fiftieth percentile male (equal in height and weight of the average North American). Thus, it is necessary to develop a scaling algorithm to scale a reference dummy size into a desired one without rebuilding the entire model. In this paper, the Hybrid III dummy model provided by LS-DYNA software is scaled to suit Vietnamese biomechanical characteristics. Scaling algorithm comprises dummy geometry, inertial properties and joint properties is utilized. In order to estimate level of head injury – brain concussion by using numerical simulation, the correlation between Head Injury Criterion (HIC) and Abbreviated Injury Scale (AIS) is introduced. In addition, the Hybrid III dummy model in crashworthiness simulation is presented in key frame picture. Numerical simulation approach is validated by comparing results of head acceleration and HIC obtain from this study with experimental data and numerical simulation results in other publication

Dynamic Behavior on Emergency Landing of Light Aircraft with Occupant Restraint System

2012 ◽  
Vol 591-593 ◽  
pp. 2513-2517
Author(s):  
Lin Yin Luo ◽  
Yan Bin He ◽  
Xuan Liu ◽  
Xiao Hu Yao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Restraint System ◽  
Element Analysis ◽  
Occupant Restraint System ◽  
Head Injury Criterion ◽  
Dynamic Finite Element ◽  
Dynamic Finite Element Analysis ◽  
Safety Design

In the case of aircraft emergency landing, occupants’ safety analysis and research is one of the indispensable links in the verification of airworthiness safety. However, traditional experimental methods is time-consuming, complex and costly, seriously affect the development of new models to market. This paper established a finite element model of the full-size aircraft cockpit according to a certain type of amphibious light aircraft, and adding the dummy and safety belt occupant restraint system finite element model on this basis. In accordance with the requirements of CCAR-23 test conditions, using large dynamic finite element analysis software LS-DYNA numerical simulation was processed to study this aircraft’s emergency landing procedure. This paper investigated the dynamic response of the dummy and head injury criterion (HIC) value etc. The results provide certain reference for aircraft emergency landing safety design.

scholarly journals Design and Finite Element Analysis of Water Jet Energy Accumulator Barrel

2018 ◽  
Vol 153 ◽  
pp. 06011
Author(s):  
Zhang Yuxian ◽  
Yang mengke ◽  
Wang Hong ◽  
Liu Binbin
Keyword(s):  
Finite Element ◽  
Wall Thickness ◽  
Equivalent Stress ◽  
Structure Design ◽  
Water Jet ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Cylinder Model ◽  
Jet Energy

In order to solve the yielding failure problem of water jet energy accumulator barrel due to high pressure, the prestressed composite structure design and the theory of equal strength are used to determine the parameters of accumulator barrel, such as the internal cylinder of the composite cylinder, the radii of the inner and outer cylinders, the radius of sub-layer and the optimal interference. Then the ANSYS software is used to analyze the cylinder model with the finite element method, the equivalent stress of the effective node along the wall thickness of the simulation model is obtained by path extraction method and the distribution curves of the equivalent stress along the wall thickness with different internal pressure are also obtained. By analyzing the simulated results and curves, the design parameters of accumulator barrel meet the expected strength requirement.

scholarly journals REDESIGN OF OUTER HOOD PANEL OF ESEMKA R2 CAR TO IMPROVE PEDESTRIAN PROTECTION USING FINITE ELEMENT MODELING

2016 ◽  
Vol 17 (2) ◽  
Author(s):  
Binyamin Binyamin
Keyword(s):  
Finite Element ◽  
Impact Energy ◽  
Traffic Accidents ◽  
Head Impact ◽  
Pedestrian Protection ◽  
Element Analysis ◽  
Impact Performance ◽  
Head Injury Criterion ◽  
Pedestrian Impact ◽  
The Impact

Traffic accidents are terrible scourge that occur in many countries, specially for developing countries where transportation affairs like tangled yarn. Besides functioning as an engine compartment cover, the hood of modern compact SUV can also help to manage the impact energy of a pedestrian’s head in a vehicle-pedestrian impact. This paper presents outer hood design of Esemka R2 that has a potential to improve hood’s ability and also to absorb the impact energy of a pedestrian’s head. The developed method for the design of an outer hood configuration aims to provide a robust design and homogeneous of Head Injury Criterion (HIC) for impact position at WAD 1000 and three different thicknesses (1.25 mm, 1.35 mm & 1.50 mm) of outer hood panel of Esemka R2 compact SUV, taking into consideration the limited space available for deformation. The non-linear Finite Element Analysis (FEA) software (Explicit Dynamics) was used in this research to simulate the testing procedurs of head impact for child pedestrian. The results show that the average of comparison dimensional of outer hood panel of Esemka R2 was 4.89 mm. The minimum of deformation space meet the requirement for HIC value which required obtaining robust and homogeneous head impact performance. Outer hood thickness and materials were identified as the factors to influence the stress and HIC value of the hood. By comparing all outer hood panels, aluminium alloy as the best selected material which has the lowest value is 32.78% for the pedestrian protection.

Application of the Behavioral Modeling Technique to Structure Optimization in Packaging Container Design

2012 ◽  
Vol 200 ◽  
pp. 592-596
Author(s):  
Mei Wang ◽  
Rong Li Zhao ◽  
Ke Tian Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structure Optimization ◽  
Structure Design ◽  
Behavioral Modeling ◽  
Modeling Technique ◽  
Design Parameters ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Design Proposal

It introduced the application of the behavioral modeling technique and the finite element analysis to optimize the packaging container structure design. Here showed an example about a design process of a certain volume beverage bottle. Firstly, through determining the design targets, analysis the design parameters and iterated calculation for these parameters, the construction and dimension of the container which meet the design targets can be obtained initially. On this basis, the stress on the container can be emulated using finite element analysis. After the strength factor to be considered, the design proposal of the packaging container is the optimized one finally.

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