A Study of the Vehicle Structure Crashworthiness in Dolly and Curb-Trip Rollover Tests

2011 ◽  
Vol 383-390 ◽  
pp. 5392-5398 ◽  
Author(s):  
Chun Sheng Ma ◽  
Jing Wen Hu ◽  
Jin Huan Zhang
Keyword(s):  
Orthogonal Design ◽  
Element Model ◽  
Structure Factors ◽  
Vehicle Structure ◽  
Vehicle Rollover ◽  
Vehicular Crashes ◽  
Crash Types ◽  
Main Effects ◽  
Deforming Velocity ◽  
Roof Deformation

Rollover crashes can be the most dangerous vehicular crashes among all crash types which have a higher fatality rate than other kinds of crashes. The orthogonal design was adopted to evaluate structure parameters how to affect the vehicle rollover crashworthiness in dolly and curb-trip tests. It is simulated with a finite element model of SUV, which has been developed previously. The parameters are based on maximum vertical roof deforming velocity, maximum vertical deformation and lateral roof deformation which nearby occupant head. They have been selected as dependent variables or responses which reflect roof stiffness and roof crush magnitude respectively. There are 11 structure factors which have an effect on the vehicle rollover crashworthiness. It can be determined under the location of crash zone in rollover. Those factors have significant effects to the vertical roof deformation, lateral roof deformation and vertical roof deforming velocity. The result can be obtained from a series of the analysis. The main effects are compared with those factors to vertical and lateral roof deformation in dolly and curb-trip tests.

Efficient Component-Based Vibration and Power Flow Analysis of a Vehicle Structure

2001 ◽  
Author(s):  
Yung-Chang Tan ◽  
Soo-Yeol Lee ◽  
Matthew P. Castanier ◽  
Christophe Pierre
Keyword(s):  
Power Flow ◽  
Flow Analysis ◽  
Element Model ◽  
Reduced Order Model ◽  
Order Model ◽  
Component Structure ◽  
Modeling And Analysis ◽  
Reduced Order ◽  
Vehicle Structure ◽  
Entire Vehicle

Abstract A case study on the efficient prediction of vibration and power flow in a vehicle structure is presented. The modeling and analysis technique is based on component mode synthesis (CMS). First, the finite element model (FEM) of the entire vehicle structure is partitioned into component models. Then, the Craig-Bampton method is used to assemble a CMS model of the vehicle. The CMS matrices are further reduced by finding characteristic constraint (CC) modes. A relatively small number of CC modes are selected to capture the primary motion of the interface between components, yielding a highly reduced order model of the vehicle vibration in the low- to mid-frequency range. Using this reduced order model (ROM), the power flow and vibration response of the vehicle is analyzed for several design configurations. A design change in one component structure requires a re-analysis of the FEM for that component only, in order to generate a new ROM of the entire vehicle. It is found that this component-based approach allows efficient evaluation of the effectiveness of the vehicle design changes.

The Radial Fretting Character Research of the Shaft-Hub of Compress Impeller Based on Virtual Orthogonal Experiment

2014 ◽  
Vol 668-669 ◽  
pp. 289-293
Author(s):  
Xue Long Lu ◽  
Jun Sheng Zhao ◽  
Xin Zhong Huang ◽  
Shuang Yong Wang
Keyword(s):  
Orthogonal Experiment ◽  
Orthogonal Design ◽  
Three Dimensional ◽  
Element Model ◽  
Optimization Method ◽  
Three Dimensional Model ◽  
Interference Fit ◽  
Rotating Speed ◽  
Compressor Impeller ◽  
Set Up

A three-dimensional model of as haft-hub of compressor impeller was set up by Pro/E. Based on the ANSYS; the finite element model was established, using the analysis method of combining submodle and paramesh. The shaft-hub of compressor impeller was simulated by virtual orthogonal design optimization method. Based on the fact that there existed radial fretting in the shaft-hub interference fit joint, researching the influence significance order and law of interference, friction coefficient and rotating speed to the maximum unit frictional work , the average friction work and the optimized parameter were obtained. It turned out that the results of the numerical simulation and orthogonal experiment were accurate and reliable, with the friction and wear effectively reduced, certain guiding references to actual assembly process were got.

scholarly journals Socioeconomic and structural profiles of the informal sector in the COVID-19 pandemics

Nova Scientia ◽  
2021 ◽  
Vol 13 ◽  
Author(s):  
Saúl Alfonso Esparza-Rodríguez ◽  
Jaime A. Martínez-Arroyo ◽  
Armando Sánchez-Vargas
Keyword(s):  
Informal Sector ◽  
Informal Economy ◽  
Categorical Data ◽  
Economic History ◽  
Social Economic ◽  
Probit Model ◽  
The People ◽  
Structure Factors ◽  
History Of ◽  
Main Effects

The crisis considered as the "Great Confinement" caused by the outbreak of the COVID-19 disease has had a multidimensional impact on humanity, on a health, social, economic, and political level. One of the main effects has been reflected in an economic crisis unparalleled in human history. In the economic history of the human being, each crisis of a wide magnitude has demonstrated a relationship between sociodemographic and economic factors and the growth of the informal economy, such as the level of earnings, scholarship, search of an extra job sex and levels of inequality and poverty. Method: Database was obtained from harmonized surveys made available by INEGI and SHCP, from where both quantitative and categorical data were identified that correspond to the structuralist and institutionalist dimension of informality. Based on that, we applied a Logit model to determine the probability of a person to belong to the informal sector of the economy, and a Probit model to identify reiterated variables of the model as well. Results: Statistically representative variables to determine the probability to belong to the informal sector, with a global percentage of 72.5 %, are the years of school, age, economic inequality, percentage of poverty in each state, the degree of spending in fiscal obligations, the level of fiscal compensations due to belonging to RIF, the type of occupation, sex and the level of minimal wages earned. Discussion or Conclusion: Considering the findings of the research, it is possible to infer that the people with higher risk of falling in the informality and continuing in it, show a characteristic profile that can be considered as a valid base to design effective public policies to reduce informality. The present research contributes trough the identification of a model that describes the profile of an individual with a higher probability of integrate to the informal sector of the economy, considering both sociodemographic and market structure factors, considering the effect of the pandemics in the current economic conditions.

Measurement of roof deformation caused by vehicle rollover

2013 ◽  
Vol 14 (4) ◽  
pp. 667-674 ◽  
Author(s):  
H. -S. Yoon ◽  
K. -T. Lee ◽  
S. -H. Ahn
Keyword(s):  
Vehicle Rollover ◽  
Roof Deformation

scholarly journals Finite Element Analysis of the Stress Field in Peri-Implant Bone: A Parametric Study of Influencing Parameters and Their Interactions for Multi-Objective Optimization

2020 ◽  
Vol 10 (17) ◽  
pp. 5973
Author(s):  
Paul Didier ◽  
Boris Piotrowski ◽  
Gael Le Coz ◽  
David Joseph ◽  
Pierre Bravetti ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Young’S Modulus ◽  
Load Transfer ◽  
Young's Modulus ◽  
Element Model ◽  
Implant Design ◽  
Main Effects ◽  
Full Factorial ◽  
Surrounding Bone

The present work proposes a parametric finite element model of the general case of a single loaded dental implant. The objective is to estimate and quantify the main effects of several parameters on stress distribution and load transfer between a loaded dental implant and its surrounding bone. The interactions between them are particularly investigated. Seven parameters (implant design and material) were considered as input variables to build the parametric finite element model: the implant diameter, length, taper and angle of inclination, Young’s modulus, the thickness of the cortical bone and Young’s modulus of the cancellous bone. All parameter combinations were tested with a full factorial design for a total of 512 models. Two biomechanical responses were identified to highlight the main effects of the full factorial design and first-order interaction between parameters: peri-implant bone stress and load transfer between bones and implants. The description of the two responses using the identified coefficients then makes it possible to optimize the implant configuration in a case study with type IV. The influence of the seven considered parameters was quantified, and objective information was given to support surgeon choices for implant design and placement. The implant diameter and Young’s modulus and the cortical thickness were the most influential parameters on the two responses. The importance of a low Young’s modulus alloy was highlighted to reduce the stress shielding between implants and the surrounding bone. This method allows obtaining optimized configurations for several case studies with a custom-made design implant.

Effect of Material Parameters Wave on Sheet Metal Springback Using Orthogonal Design Simulation

2011 ◽  
Vol 314-316 ◽  
pp. 585-588 ◽  
Author(s):  
Lei Chen
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Orthogonal Design ◽  
Direct Analysis ◽  
Element Model ◽  
Internal Stresses ◽  
Common Phenomenon ◽  
Material Parameters ◽  
Simulation Results

Springback is a common phenomenon in sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading. The aim of this search is to investigate the wave of material parameters on the results of forming and springback of sheet metal. A finite element model of cylinder bending benchmark of NUMISHEET’2002 was proposed firstly to simulate bending and springback with contact evolution between tools and blank based on static implicit method. The simulation results agree well with the experiment. Then the effects of the wave of material parameters on forming and springback results are investigated using orthogonal design simulation. Eight factors are investigated with the orthogonal label. The results show the factors have different effects on both the forming and springback. And the significance of the factors is shown through direct analysis of the results.

The Effects of Parameter Settings on Shrinkage and Warpage in Injection Molding through Cadmould 3D-F Simulation and Taguchi Method

2012 ◽  
Vol 229-231 ◽  
pp. 2536-2540 ◽  
Author(s):  
Mohd Hilmi Othman ◽  
Shazarel Shamsudin ◽  
Sulaiman Hasan
Keyword(s):  
Injection Molding ◽  
Process Parameters ◽  
Orthogonal Design ◽  
Simulation Software ◽  
P Value ◽  
Packing Pressure ◽  
Filling Time ◽  
Main Effects ◽  
The Impact ◽  
Taguchi Orthogonal Design

This study is focused on the effects of process parameters in plastic injection molding towards shrinkage and warpage problem of High Density Polyethylene (HDPE) specimen. The aim was to identify the main effects of different process parameters on warpage and shrinkage defects via numerical simulation software and experimental validation. Series of simulations were carried out using Cadmould 3D-F in order to utilize the combination of process parameters based on three level of L9 Taguchi orthogonal design. The Signal to Noise (S/N) ratio and the Analysis of Variance (ANOVA) were used to optimize the levels and to point out the impact of the process parameters on warpage and shrinkage. From the results, it showed that the most affected parameter on the warpage and shrinkage is packing time, with the P value of 48.93%, followed by melting temperature with 40.58%. The filling time and packing pressure were not a significant factor because they only contribute 7.30% and 3.19% of P value, respectively.

An Investigation Into the Performance of Cantilever Hook Type Integral Attachment Features

1996 ◽  
Author(s):  
Anthony F. Luscher
Keyword(s):  
Design Space ◽  
Element Model ◽  
Dynamic Strain ◽  
Inexpensive Method ◽  
Insertion Force ◽  
Balanced Design ◽  
Type Integral ◽  
Integral Attachment ◽  
Plastic Parts ◽  
Main Effects

Abstract Cantilever hook features are commonly molded into plastic parts as a inexpensive method of assembling several parts without separate fasteners. Insertion force, insertion dynamic strain, and retention force represent the critical performance data needed to design a cantilever hook for given loading conditions. This paper explores the performance of this feature under both insertion and retention using numerical and experimental methods. A finite element model using contact and friction surface elements was used to simulate the actual insertion and retention processes of hooks. The design space for a hook was explored by using a design of experiments approach. Sensitivity information was obtained by tabulating main effects and interactions. For the goal of minimizing insertion force and maximizing retention strength, a balanced design was found which was sensitive to differing factors. Based on this data, generalized design rules for designing hooks were formulated.

Challenge Face by Truck Frontal Crash Analysis

1994 ◽  
Author(s):  
James C. Cheng ◽  
Jialiang Le
Keyword(s):  
Element Model ◽  
The Body ◽  
Crash Test ◽  
Mass Model ◽  
Nonlinear Springs ◽  
Weight Variation ◽  
Design Cycle ◽  
Vehicle Structure ◽  
Occupant Injury ◽  
Reasonable Prediction

Abstract In the front barrier crash, due to basic structural differences, light truck body-on-frame vehicles behave quite differently man unitized body vehicles. The complexities of the vehicle structure, weight variation of the test condition, and inherent limited crash distance have made CAE analysis a very attractive method to reduce prototype testing and shorten the design cycle time. The deceleration of the vehicle experienced by the occupant, or “crash pulse”, plays a key role in evaluating occupant injury. In order to maximize CAE’s contribution to design, a reasonable prediction of the crash pulse is crucial. For body-on-frame vehicles, body mounts that connect the cab to the chassis have a pronounced effect on the crash pulse. However, the crash characteristic of the body mount is not fully understood. Therefore, a procedure was developed to provide a good estimation of their behavior. This procedure uses a spring-mass model and a finite element model to simulate a frontal barrier crash test. In both models, the body mounts were modeled as nonlinear springs. By correlating the vehicle response at different locations, a reasonable prediction of the body mounts can be obtained. Further design iterations can be performed once the body mounts characteristic is determined.

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