scholarly journals The synthesized method based on classical mechanics and finite element for vehicle collision accident reconstruction analysis

2021 ◽  
pp. 1-8
Author(s):  
Yi Cao ◽  
Yi-fei Luo
Keyword(s):  
Finite Element ◽  
Classical Mechanics ◽  
Accident Reconstruction ◽  
Vehicle Collision ◽  
Vehicle Collision Accident

scholarly journals Determination of Selected Crash Parameters in Head-on Vehicle Collision with Rollover

2016 ◽  
Vol 28 (1) ◽  
pp. 71-79
Author(s):  
Tomáš Coufal ◽  
Marek Semela
Keyword(s):  
Traffic Accident ◽  
Crash Test ◽  
Accident Reconstruction ◽  
Vehicle Collision ◽  
Reconstruction Software ◽  
Vehicle Rollover ◽  
Head And Neck Injury ◽  
Small Overlap ◽  
Crush Zone

The paper presents complete results of the head-on small overlap crash test of vehicle with driver moving at a speed of approximately 12 m/s against stationary vehicle with post-crash rollover. When a crash does not involve the main crush-zone structures, the occupant compartment is not well protected. The emphasis in the paper was put on determination and presentation of crash parameters for the application in traffic accident analyses and for simulation with the help of software for accident reconstruction. The experimentally measured data from the crash test were analysed and important crash parameters which are necessary for accident reconstruction were obtained. The crash test was specific because of rollover of the impacting vehicle resulting from small overlap. The results have shown that small overlap accident is extremely dangerous for the crew with the possibility of vehicle rollover and occupant head and neck injury. Also in this case, at relative low speed, the driver suffered light neck and head injury in the following days and the longitudinal damage was relatively large. The input parameters for accident reconstruction software as the result of performed crash test were gained.

scholarly journals New Analytical Model Used in Finite Element Analysis of Solids Mechanics

Mathematics ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1401 ◽  
Author(s):  
Sorin Vlase ◽  
Adrian Eracle Nicolescu ◽  
Marin Marin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Equations Of Motion ◽  
Classical Mechanics ◽  
Three Dimensional ◽  
Elastic Solid ◽  
The Finite Element Method ◽  
Governing Equations ◽  
Element Analysis ◽  
Elastic Multibody System

In classical mechanics, determining the governing equations of motion using finite element analysis (FEA) of an elastic multibody system (MBS) leads to a system of second order differential equations. To integrate this, it must be transformed into a system of first-order equations. However, this can also be achieved directly and naturally if Hamilton’s equations are used. The paper presents this useful alternative formalism used in conjunction with the finite element method for MBSs. The motion equations in the very general case of a three-dimensional motion of an elastic solid are obtained. To illustrate the method, two examples are presented. A comparison between the integration times in the two cases presents another possible advantage of applying this method.

An Investigation on Speedometer Pointer Residual-Value of Crashing Vehicle and its Application in Accident Reconstruction

2012 ◽  
Vol 152-154 ◽  
pp. 1177-1182
Author(s):  
Yuan Quan ◽  
Xiao Qi Chen ◽  
Yi Bing Li
Keyword(s):  
Traffic Accident ◽  
Effective Means ◽  
Research Work ◽  
Accident Reconstruction ◽  
Vehicle Speed ◽  
Damage And Failure ◽  
Vehicle Collision ◽  
Vehicle Impact ◽  
Speed Identification ◽  
Real Traffic

According to the experience of traffic accident investigation over the years, the pointer of some crashed vehicles’ speedometer will stay in one place because of collision spread or heavily vibration, which may indicate the vehicle collision speed. However, the correlation between the residual speed value and actual vehicle collision speed still remains to be examined. For the practical needs of traffic accident reconstruction, this research work is carried out. Based on the principles of traditional speedometers, vehicle impact mechanics and failure mechanism, the damage and failure mode of speedometer in collision are studied. Through the statistics of 15 real traffic accident cases, the features and law about the pointer information of damaged speedometers are obtained initially. As an example, one of these cases is analyzed and calculated to verify the assumption. The availability of the mark information on the indicated place of speedometer after accidents (i.e. the correlation between the speed value of pointers and actual vehicle collision speed) is discussed, which can provide effective means and references for accident reconstruction and vehicle speed identification.

The Study of the Shaft Misalignment Compensation Ability of Four Holes Articulated Laminated Coupling

2011 ◽  
Vol 211-212 ◽  
pp. 1137-1141
Author(s):  
Liu Fang Shentu ◽  
Gui San Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Classical Mechanics ◽  
Main Function ◽  
Element Analysis ◽  
Laminated Structure ◽  
Operation Process ◽  
Shaft Misalignment ◽  
New Type

The function of the coupling in the connection device is to connect the two axises and transfer the movement. Due to the particular structure of the laminated coupling, the main function of the coupling is to compensate the misalignment generated in the operation process of the axises. In this paper, a new type of laminated structure coupling - four-hole Joint Bearing laminated coupling is proposed. By using this coupling the shaft misalignment compensation ability between the two axises is improved from 1.0 ° ~ 1.5 ° to 4 ° ~ 6 °. Classical mechanics method and ANSYS finite element analysis are employed to analyse 3 different sizes of joint couplings, respectively. From the analysis the position of the maximum stress and the shaft misalignment compensation ability of each kind of coupling which provide the theory basis for the design of the new type of the coupling can be obtained.

Development and validation of a new finite element human head model

2018 ◽  
Vol 35 (1) ◽  
pp. 477-496 ◽  
Author(s):  
Fábio A.O. Fernandes ◽  
Dmitri Tchepel ◽  
Ricardo J. Alves de Sousa ◽  
Mariusz Ptak
Keyword(s):  
Finite Element ◽  
Design Methodology ◽  
Human Head ◽  
Design Tool ◽  
Head Model ◽  
Accident Reconstruction ◽  
Research Groups ◽  
Content Type ◽  
Development And Validation ◽  
The Brain

Purpose Currently, there are some finite element head models developed by research groups all around the world. Nevertheless, the majority are not geometrically accurate. One of the problems is the brain geometry, which usually resembles a sphere. This may raise problems when reconstructing any event that involves brain kinematics, such as accidents, affecting the correct evaluation of resulting injuries. Thus, the purpose of this study is to develop a new finite element head model more accurate than the existing ones. Design/methodology/approach In this work, a new and geometrically detailed finite element brain model is proposed. Special attention was given to sulci and gyri modelling, making this model more geometrically accurate than currently available ones. In addition, these brain features are important to predict specific injuries such as brain contusions, which usually involve the crowns of gyri. Findings The model was validated against experimental data from impact tests on cadavers, comparing the intracranial pressure at frontal, parietal, occipital and posterior fossa regions. Originality/value As this model is validated, it can be now used in accident reconstruction and injury evaluation and even as a design tool for protective head gear.

Research on Lifting Technology of Engine Hood for Protecting the Head of Pedestrian

2013 ◽  
Vol 391 ◽  
pp. 101-104
Author(s):  
Bao Feng Zhang ◽  
Qing Kui Wei ◽  
Jian Wen Li
Keyword(s):  
Traffic Accident ◽  
National Standard ◽  
Body System ◽  
Human Body Model ◽  
Protective Measures ◽  
Simulation Tools ◽  
Body Model ◽  
Vehicle Collision ◽  
Adams Software ◽  
Vehicle Collision Accident

In the pedestrian and vehicle collision accident, head injury is the first factor of causing death, so studying the mechanism and protective measures are very important. In this paper, based on the theory of multi-rigid-body system dynamics, used ADAMS software for simulation tools, established human body model and car mode to follow the national standard. Finally put forward a new hood lift technology. The simulation results show that the technology can effectively reduce the collision impact on pedestrian head in the traffic accident.

Modelling the tyre forces for a simulation analysis of a vehicle accident reconstruction

2016 ◽  
Vol 231 (1) ◽  
pp. 16-26 ◽  
Author(s):  
Inhwan Han
Keyword(s):  
Vehicle Dynamics ◽  
Dynamic Behaviour ◽  
Simulation Analysis ◽  
Physical Parameters ◽  
Force Model ◽  
Accident Reconstruction ◽  
Test Results ◽  
Vehicle Accident ◽  
Vehicle Collision ◽  
Core Part

This paper proposes a modified bilinear tyre force model for simulations of the vehicle dynamics, which is the core part in reconstruction analysis of vehicle collision accidents. The physical parameters involved were estimated using a statistical method based on experimental test results of the tyre forces. With an appropriate setting of the input data related to a tyre blowout, a simulation analysis of the dynamics of the vehicle which had suffered the tyre blowout was performed. The developed simulation analysis results for the dynamic behaviour of a vehicle with normal tyres with total locks or with a one-wheel lock and for vehicles with tyre blowouts when driving straight or turning corresponded well to the results of other commercial programs. The reliability of these results was proved by comparing them with the corresponding data for many vehicles involved in blowout-related accidents and in particular the path travelled by those vehicles as recorded on black-box footages.

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