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Body Structure Strength Of Sleeper Coaches During Rollover Test As Per AIS 119

International Centre For Automotive Tech.-Gopal Singh Rathore
  • Technical Paper
  • 2019-28-2567
To be published on 2019-11-21 by SAE International in United States
Bus passenger safety has always been a concern considering various impacts like side impact, front impact, rollover etc. happening in real life scenarios. Various standards have been formulated for simulating these conditions and with respect to rollover, standards like ECE-R66 are being used to understand the superstructure strength. In India, we have AIS-052 (bus body code) and AIS-031 specific for bus rollover testing. AIS-119 has been published for rollover testing of sleeper coaches with modifications in the survival space creation in sleeper coaches for berths. With physical testing being more expensive, CAE simulations are being considered as vital option which also helps in design modification in a lesser time. This paper discusses the scope of numerical simulation of sleeper coach rollover using an explicit dynamic solver RADIOSS to understand the structure deformations, survival space clearances/intrusions. The paper will describe the procedure for the numerical simulation starting from the CAD development, geometry clean up, meshing techniques, element formulations, CG measurement, input deck set up till the post processing of results. In order to validate the numerical…
 

Passenger "Sleeper Bus" Structure, an Optimization Study using Finite Element Analysis

JCBL, Ltd.-Yaseen Khan
JCBL,Ltd.-Priyanka Bhola
  • Technical Paper
  • 2019-28-2537
To be published on 2019-11-21 by SAE International in United States
ABSTRACT Sleeper buses are increasingly used as connectivity between cities and remote areas with sleeping comfort for passengers. During the normal operation, the bus body is subjected to several loads, external loads from the road (i.e. crossing over a speed bump, breaking & cornering). Moreover, there is a substantial possibility that these loads may lead to a structural failure. Hence, it is necessary to determine stresses occurred in the bus body to ensure its integrity under these driving scenarios. During the accident, rollover/front/rear/side impact, energy absorbing capacity of bus body structure is crucial for safety of passengers. The objective of this study is to reduce weight of bus structure while maintaining cost & safety as constraint. 3D Model prepared in NX and finite element model created in hypermesh ,LS-dyna/optistruct used as solver and post processing done in hyperview. In this study, fully loaded bus with passengers as well as maximum language mass, considered. The present study is based on the finite element analysis and design optimization of passenger sleeper bus. Number of iterations in stiffness…
 

Numerical Study of Effect of Material and Orientation on Strength of Side Door Intrusion Beam

Vellore Institute of Technology-Mayank Chandak, Hirdekar Antariksh, Chavan Saurabh, Kannan Chidambaram
  • Technical Paper
  • 2019-28-0039
To be published on 2019-10-11 by SAE International in United States
Nowadays more and more people are concerned about the safety rating of their vehicle. The safety rating depends on the ability of the car to minimize the injury to the occupants post-crash. Crashworthiness of the vehicle is determined by carrying out various tests such as static and dynamic tests. Side crashes are one of the leading causes of fatal injury following front crashes. Side door strength is dependent on the door components such as latch and striker, hinge, door beam etc. Lateral stiffness is contributed significantly by the side door beam in the door structure. The side door beam limits the side intrusion into passenger compartment. This paper emphasizes the effect of intrusion beam materials and orientation in the side door strength with a numerical approach using ANSYS tool. These factors affect the strength and weight of the door. The simulation study with respect to door design is cost-effective and time-saving. Side door intrusion test as per IS 12009 norms is simulated in the software and are substantiated by the experimental test results of existing…
 

Next Steps for the IIHS Side Crashworthiness Evaluation Program

Insurance Institute for Highway Safety (IIHS)-Raul A. Arbelaez, Becky C. Mueller, Matthew L. Brumbelow, Eric R. Teoh
Published 2019-07-08 by The Stapp Association in United States
Abstract - IIHS has been conducting side impact crash tests since 2003. To understand how the side crashworthiness program can be enhanced, an ongoing research effort is focused on understanding the correlation between IIHS ratings and driver death rate. In addition, the performance of good-rated late-model vehicles has been assessed in higher severity side crash tests. The purpose of this short communication is to summarize the ongoing work and potential next steps toward developing a new crash test procedure or updating ratings criteria to further advance side crashworthiness.
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Stapp Car Crash Journal Vol. 62, 2018

  • Book
  • B-STAPP2018
Published 2019-04-30 by The Stapp Association in United States
This title includes the technical papers developed for the 2018 Stapp Car Crash Conference, the premier forum for the presentation of research in impact biomechanics, human injury tolerance, and related fields, advancing the knowledge of land-vehicle crash injury protection. The conference provides an opportunity to participate in open discussion about the causes and mechanisms of injury, experimental methods and tools for use in impact biomechanics research, and the development of new concepts for reducing injuries and fatalities in automobile crashes. The topics covered this year include: • Effect of restraints on chest deflection • Thoracic response in dynamic front loading • Side impact assessments and comparisons • Front airbag deployment rates and implications • Reanalysis of experimental brain strain data • Modeling pedestrian impacts • Short communications o New data on the biomechanics of injury and human tolerance, new methods and tools to study the biomechanics of injury, new developments in occupant protection systems, and new concepts on the biomechanics of injury based on experimental and analytical studies.
 

Design for Crashworthiness of Vehicle Structures Using an Extended Hybrid Cellular Automaton Method

General Motors-Chandan Mozumder, Simon Xu
Indiana University; Purdue University-Prasad Tapkir, Andres Tovar
Published 2019-04-02 by SAE International in United States
This paper introduces a design methodology to tailor the acceleration and displacement responses of a vehicle structure subjected to a dynamic crushing load. The proposed approach is an extension of the hybrid cellular automaton (HCA) method, through which the internal energy density is uniformly distributed within the structure. The proposed approach, referred here to as an extended HCA (xHCA) method, receives the suitable combinations of volume fraction and a finite element meta-parameter for which the algorithm synthesizes the load paths that allow the desired crash response. Lower meta-parameter values lead designs obtained by traditional optimizers, while larger values lead to designs obtained by the HCA method. Simultaneous implementation of multiple values of meta-parameters is presented here as a further development of xHCA method. Numerical examples of vehicle components under the side and the frontal impact are demonstrated to assess the xHCA capabilities of tailoring the crash responses.
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Performance of Event Data Recorders Found in Toyota Airbag Control Modules in High Severity Frontal Oblique Offset Crash Tests

Kineticorp, LLC.-William Bortles
University of Tulsa-Ryan Hostetler
Published 2019-04-02 by SAE International in United States
This paper presents an in-depth analysis of the performance of Event Data Recorders (EDRs) found in the Airbag Control Modules (ACMs), as tested in support of the National Highway Traffic Safety Administration’s Frontal Oblique Offset Program. Previous studies have examined EDR performance in high severity full-frontal barrier crash tests and moving deformable barrier side impact tests. This paper presents data from a high severity oblique frontal impact test in which the vehicle was struck by a moving deformable barrier. This paper examines the results of EDR data downloaded from two 2015 model year Toyota Highlanders, and the results of EDR reported change in velocity (delta-v), to vehicle mounted accelerometers and reference instrumentation. This paper will analyze EDR performance in reporting: Seatbelt buckle status,Occupant Size Classification, Front Passenger,Airbag and seatbelt pretensioner deployment time(s),Longitudinal delta-v, andLateral acceleration/crash pulse.
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Passenger Vehicle Dynamic Response and Characterization of Side Structure during Low- to Moderate-Speed Side Impacts

Exponent Inc.-Jason Skiera, Charles Crosby, Cleve Bare, Marc Paradiso, Gregory Campbell
Published 2019-04-02 by SAE International in United States
A significant portion of real-world passenger vehicle side impacts occur at lower speeds than testing conducted by the National Highway Traffic Safety Administration (NHTSA) or the Insurance Institute for Highway Safety (IIHS). Test data from low- to moderate-speed side impacts involving late-model passenger vehicles is limited, making the evaluation of vehicle impact response, occupant loading, and injury potential challenging. This study provides the results of low- to moderate-speed impact testing involving a late-model mid-size sedan. Two full-scale Non-Deformable Moving Barrier (NDMB) side impact crash tests were conducted at speeds of 6.2 mph (10.0 kph) and 13.4 mph (21.6 kph). Instrumentation on the late-model sedan used for the test series included tri-axis accelerometers and seat belt load cells. In both tests, instrumented Hybrid III 50th percentile-male Anthropomorphic Test Devices (ATDs) were restrained in the driver and passenger seats using the standard three-point seat belts. Response data for the vehicle, barrier, and ATDs was recorded using onboard data acquisition, and on- and off-board real-time and high-speed video cameras. In addition, the deformation to the side of the…
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Prediction and Validation of Unknown GISSMO Properties Using by Regression Analysis of Experimental Damage Tests

Hyundai Dymos Seat R&D Center-Tae Hwan Jun
Published 2019-03-25 by SAE International in United States
A seat, as one of the main automobile components is closely related to the passenger safety. It plays an important role on a protection of passengers from a sudden movement of a car and external front/rear/side crash. In order to achieve these purposes, strength, rigidity and durability of a seat have to be satisfied which are regulated by the law. Therefore, a prediction of the fracture time and the behavior of the seat structure by Finite Element analysis are very important. However, the fracture prediction method from axial tensile strength test has limits to present the behavior which is obtained in multiple loading cases. For this reason, a new analysis method for the fracture prediction considering multiple loading cases has to be established.In this research, the phenomenon of a seat fracture is implemented and the simulation is performed to predict the behavior using GISSMO Damage model in LS-DYNA. In order to find a fracture strain in a diverse stress mode, deformation tests of shear into a multiple direction, bi-axial tensile tests, notch impact test and…
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A Robust Structure Analysis on Automotive Door Armrest

FCA Engineering India Pvt Ltd.-Aswin Venkatesan, Sathish Kumar Sampath Kumar, Chandrasekhar Uppaluru
FCA US LLC-Mark Gratowski
Published 2019-01-09 by SAE International in United States
An automobile door is one vital commodity which has its role in vehicle’s function, strength, safety, dynamics and aesthetic parameters. The door system comprises of individual components and sub-assemblies such as door upper, bolster, armrest, door main panel, map-pocket, handle, speaker and tweeter grille. Among them, armrest is an integral part which provides function and also takes care of some safety parameter for the customers. The basic function of an armrest is to provide ergonomic relief to occupant for resting his hand. Along with this, it also facilitates occupant safety during a side impact collision by absorbing the energy and not imparting the reactive force on occupant. Thus an armrest has evolved as a feature of passive safety. The armrest design should be stiff enough to withstand required elbow load condition with-in the acceptable deflection criteria. On the other hand, armrest has to absorb the dynamic force by deflecting proportionally to the side impact load. In this study the various structure of armrest was analyzed to strike an ideal zone between functional and safety parameters.…
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