A Computational Study On Static And Unconstrained Dynamic Rollover Crash Tests Of A Mid Size Suv For Various Initial Rollover Parameters
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A Computational Study On Static And Unconstrained Dynamic Rollover Crash Tests Of A Mid Size Suv For Various Initial Rollover Parameters
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Author : Rohit Kolluru
language : en
Publisher:
Release Date : 2018
A Computational Study On Static And Unconstrained Dynamic Rollover Crash Tests Of A Mid Size Suv For Various Initial Rollover Parameters written by Rohit Kolluru and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Electronic dissertations categories.
In terms of frequency of accidents, rollover crashes are uncommon among all other crash types or directions. However, they are associated with highest fatality rate than any other crashes, as 33% of fatalities in automobile crashes correspond to rollover crashes. Beside a static roof crush test procedure, there is yet no standard dynamic test procedure to certify a vehicle for occupant rollover protection, because of its complexity and various factors that affect the outcome of the rollover crashes. The unpredictability of the rollover makes it difficult to design standard test procedure. There are various factors and parameters that affect the rollover crashes such as vehicle speed, height of its fall, angle of contact with the ground, side of contact, reason for the rollover, etc. The countermeasure for these parameters are also difficult to be included in a standard test procedure. The present study is focused on development and utilization of a computational finite element model of typical SUV vehicle in static and unconstrained dynamic rollover tests. The vehicle is subjected to various dynamic rollover parameters, including the height of its fall, longitudinal speed of the vehicle during the rollover and angle of contact with the ground. In the end, various parametric studies are examined on a Toyota RAV4 rollover crash, the energy inducing and the force imparting to the vehicle are analyzed, and their effects shall be identified for a recommended set of initial roll parameters.
Comparison Of Jordan And Unconstrained Dynamic Rollover Tests Using Computational Finite Element Method
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Author : Sandeepa Udawalawwa
language : en
Publisher:
Release Date : 2019
Comparison Of Jordan And Unconstrained Dynamic Rollover Tests Using Computational Finite Element Method written by Sandeepa Udawalawwa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electronic dissertations categories.
Rollover crashes are complex and relatively infrequent compared with other types of vehicle crashes, but they result in highest fatality rates among all common types of vehicle accidents. The Sport Utility Vehicles (SUV's) are the most common vehicles involved in rollover crashes compared to other vehicles. Different types of static and dynamic test methods have been proposed and implemented to evaluate the performance of a vehicle in rollover crashes. However due to complexity of rollover crashes, no specific dynamic method is required at present to evaluate the rollover crash and occupant protection responses, as a several factors could affect the rollover impact outcome. In this study, the finite element modeling and simulation of a typical SUV is first conducted for static roof crush test per regulatory Federal Motor Vehicle Safety Standards (FMVSS) 216. Once model evaluation and validation is completed, the finite element modeling and simulation of a simplified Jordan Rollover System (JRS) is conducted and the results are compared with these corresponding to an unconstrained rollover tests, both performed on the same SUV. A parametric study is conducted for pertinent dynamic rollover parameters such as drop height of the vehicle, and the platform floor speed. The results from the simulation test measurements including intrusion of roof components, reaction/contact force on the platform, roll angle, and roll rate of the vehicle, and the internal energy generated of the rollover are all examined and compared. Results from the simulations are analyzed to examine the significance of using either JRS or unconstrained rollover models. Recommendations are made based on initial rollover conditions for better dynamic approach and suggestion for test protocols or standards.
Analysis Detection And Early Warning Control Of Dynamic Rollover Of Heavy Freight Vehicles
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Author :
language : en
Publisher:
Release Date : 1999
Analysis Detection And Early Warning Control Of Dynamic Rollover Of Heavy Freight Vehicles written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Crashworthiness Of A Vehicle For Rollover Impact Protection Using Impaxx And Aluminum Foam Materials
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Author : Sanjay Narayan
language : en
Publisher:
Release Date : 2019
Crashworthiness Of A Vehicle For Rollover Impact Protection Using Impaxx And Aluminum Foam Materials written by Sanjay Narayan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electronic dissertations categories.
Rollover crash events frequency accounts for only 3% among all types of accidents, but in terms of fatality rate, it accounts for 33% of fatalities in automobile crash accident events. Rollover events are complex and unpredictable, making them quite difficult to design a standard testing procedures. The angle of contact with the ground, the side coming into contact, height of fall, speed of vehicle, cause for rollover, etc., are all parameters and factors which could affect rollover crash responses. Presently the standard testing procedure for rollover is a quasi-static roof crush test procedure. This study details the development, analysis and computational modelling and simulation of the performance of an IMPAXX and aluminum foam and their potential as an energy absorbing material to improve the roof strength of a vehicle. First the IMPAXX foam and Aluminum foam are modelled using the LS-DYNA code, and their performances are evaluated using a drop tower test and a free motion headform test methods. Next, the IMPAXX foam and Aluminum foam are modelled for insertion in the roof A-pillar of a typical sports utility vehicle (Toyota Rav4). Quasi-static roof crush computational tests, per two different standards FMVSS 216 and IIHS are conducted on the vehicle and solved using the LS-DYNA for vehicles with and without the IMPAXX and aluminum foam. The results are analyzed and compared to quantify the effectiveness of the IMPAXX foam and aluminum foam as energy absorbing materials for rollover crashworthiness responses of vehicle and its occupant protection.
Rollover Accident Reconstruction
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Author : Nathan A Rose
language : en
Publisher: SAE International
Release Date : 2018-08-07
Rollover Accident Reconstruction written by Nathan A Rose and has been published by SAE International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-07 with Technology & Engineering categories.
According to the National Highway Traffic Safety Administration, “of the nearly 9.1 million passenger car, SUV, pickup and van crashes in 2010, only 2.1% involved a rollover. However, rollovers accounted for nearly 35% of all deaths from passenger vehicle crashes. In 2010 alone, more than 7,600 people died in rollover crashes.” Rollover accidents continue to be a leading contributor of vehicle deaths. While this continues to be true, it is pertinent to understand the entire crash process. Each stage of the accident provides valuable insight into the application of reconstruction methodologies. Rollover Accident Reconstruction focuses on tripped, single vehicle rollover crashes that terminate without striking a fixed object. Topics featured in this book include: • Analysis methods through various accident phases, including advanced simulation • Vehicle event data recorder usage • Occupant ejection during rollover crash The goal of this title is to break down the various phases of a rollover crash to analyze each stage for use in the reconstruction process - to the greater understanding of crash analysts, consultants and safety engineers alike.
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover
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Author : Zhilin Jin
language : en
Publisher: Springer Nature
Release Date : 2022-06-01
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover written by Zhilin Jin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-01 with Technology & Engineering categories.
Vehicle rollover accidents have been a serious safety problem for the last three decades. Although rollovers are a small percentage of all traffic accidents, they do account for a large proportion of severe and fatal injuries. Specifically, some large passenger vehicles, such as large vans, pickup trucks, and sport utility vehicles, are more prone to rollover accidents with a high center of gravity (CG) and narrow track width. Vehicle rollover accidents may be grouped into two categories: tripped and untripped rollovers. A tripped rollover commonly occurs when a vehicle skids and digs its tires into soft soil or hits a tripping mechanism such as a curb with a sufficiently large lateral velocity. On the other hand, the untripped rollover is induced by extreme maneuvers during critical driving situations, such as excessive speed during cornering, obstacle avoidance, and severe lane change maneuver. In these situations, the forces at the tire-road contact point are large enough to cause the vehicle to roll over. Furthermore, vehicle rollover may occur due to external disturbances such as side-wind and steering excitation. Therefore, it is necessary to investigate the dynamic stability and control of tripped and untripped vehicle rollover so as to avoid vehicle rollover accidents. In this book, different dynamic models are used to describe the vehicle rollover under both untripped and special tripped situations. From the vehicle dynamics theory, rollover indices are deduced, and the dynamic stabilities of vehicle rollover are analyzed. In addition, some active control strategies are discussed to improve the anti-rollover performance of the vehicle.
Rollover Accident Reconstruction
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Author : Nathan A Rose
language : en
Publisher: SAE International
Release Date : 2018-08-07
Rollover Accident Reconstruction written by Nathan A Rose and has been published by SAE International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-07 with Technology & Engineering categories.
According to the National Highway Traffic Safety Administration, “of the nearly 9.1 million passenger car, SUV, pickup and van crashes in 2010, only 2.1% involved a rollover. However, rollovers accounted for nearly 35% of all deaths from passenger vehicle crashes. In 2010 alone, more than 7,600 people died in rollover crashes.” Rollover accidents continue to be a leading contributor of vehicle deaths. While this continues to be true, it is pertinent to understand the entire crash process. Each stage of the accident provides valuable insight into the application of reconstruction methodologies. Rollover Accident Reconstruction focuses on tripped, single vehicle rollover crashes that terminate without striking a fixed object. Topics featured in this book include: • Analysis methods through various accident phases, including advanced simulation • Vehicle event data recorder usage • Occupant ejection during rollover crash The goal of this title is to break down the various phases of a rollover crash to analyze each stage for use in the reconstruction process - to the greater understanding of crash analysts, consultants and safety engineers alike.
Heavy Truck 180 Dynamic Rollover And Static Roof Crush Simulation
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Author :
language : en
Publisher:
Release Date : 1996
Heavy Truck 180 Dynamic Rollover And Static Roof Crush Simulation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Tractor trailer combinations categories.
This report describes the work performed by Failure Analysis Associates, Inc. (FaAA), in Phase II of the SAE Heavy Truck Crashworthiness project. FaAA was charged with developing a computer model of a typical heavy-truck cab, verifying the cab's structural characteristics via comparison with actual test data, and using the model to evaluate performance of the baseline cab and a modified version in a simulated rollover accident.
Heavy Truck Crashworthiness Phase Ii
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Author : T. Kim Parnell
language : en
Publisher:
Release Date : 1996
Heavy Truck Crashworthiness Phase Ii written by T. Kim Parnell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Tractor trailer combinations categories.
Rollover Of Heavy Commercial Vehicles
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Author : C.B Winkler
language : en
Publisher:
Release Date : 1999
Rollover Of Heavy Commercial Vehicles written by C.B Winkler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.