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Viewing 1 to 30 of 2143
2017-03-28
Technical Paper
2017-01-1471
Xiao Luo, Wenjing Du, Hao Li, Peiyu LI, Chunsheng Ma, Shucai Xu, Jinhuan Zhang
Occupant restraint systems are developed based on some baseline experiments, while these experiments can only represent a small part of various accidents, so the current design of occupant restraint systems cannot provide the optimum protection effects for occupants during the majority of accidents. This study presents an approach to predict occupant injury before the collision happens, so that the occupant restraint system can be adjusted to the optimum parameters aiming at the imminent vehicle-to-vehicle frontal crash. The approach in this study takes advantages of the information from pre-crash systems, such as the time to collision, the relative velocity, the frontal overlap of the ego vehicle during the collision, the size of the vehicle in the front and so on. The information acquired and the basic crash test results can be integrated to predict a simplified crash pulse, and the injury of the occupant in the ego vehicle can thus be predicted using this crash pulse.
2017-03-28
Technical Paper
2017-01-1472
Niels Pasligh, Robert Schilling, Marian Bulla
Rivets, especially self-piercing rivets (SPR), are one primary joining technology for vehicles using aluminum. SPR are mechanical joining elements that are used to connect sheets to create a structure to build a body in white (BiW). To ensure the structural performance of a vehicle in crash load cases it is necessary to describe physical occurring failure modes under overloading conditions in simulations. One failure mode is joint separation which need to be precisely predicted by a crash simulation. Within crash simulations a detailed analysis of a SPR joint and its process history would require a very high computational effort. The conflict between a detailed SPR joint and a macroscopic vehicle model need to solved by developing an approach that can handle an accurate macroscopic prediction of SPR behavior with a defined strength level with less computational effort. One approach is using a cohesive material model for a SPR connection.
2017-03-28
Technical Paper
2017-01-1474
Raed E. El-Jawahri, Agnes Kim, Dean Jaradi, Rich Ruthinowski, Kevin Siasoco, Cortney Stancato, Para Weerappuli
Sled testing simulating a full-frontal rigid barrier impacts were conducted using the Hybrid III 5th female and the 50th male anthropomorphic test devices (ATDs). The ATDs were positioned in the outboard rear seat of a generic small car environment. Two belt configurations were used: 1) a standard belt with no load limiter or pre-tensioner and 2) a seatbelt with a 4.5 kN load-limiting retractor with a stop function and a retractor pre-tensioner (LL-PT). In the current study, the LL-PT belt system reduced the peak responses of both ATDs. Probabilities of serious-to-fatal injuries (AIS3+), based on the ATDs peak responses, were calculated using the risk curves in NHTSA’s December 2015 Request for Comments (RFC) proposing changes to the United States New Car Assessment Program (US-NCAP). Those probabilities were compared to the injury rates (IRs) observed in the field on aggregate and point estimate bases.
2017-03-28
Technical Paper
2017-01-1473
Ling zheng, Yinan Gao, Zhenfei Zhan, Yinong Li
Several surrogate models such as radial basis function and Kriging models are developed to speed the optimization design of vehicle body and improve the vehicle crashworthiness. The error analysis is used to investigate the accuracy of different surrogate models. Furthermore, the Kriging model is used to fit the model of B-pillar acceleration and foot well intrusion. The multiquadric radial basis function is used to fit the model of the entire vehicle mass. These models are further used to calculate the acceleration response in B-pillar, foot well intrusion and vehicle mass instead of the finite element model in the optimization design of vehicle crashworthiness. A multi-objective optimization problem is formulated in order to improve vehicle safety performance and keep its light weight. The particle swarm method is used to solve the proposed multi-objective optimization problem.
2017-03-28
Technical Paper
2017-01-1469
Tao Wang, Liangmo Wang, Jingxing Liu
To investigate the crashworthiness capacity of a M1 type commercial vehicle, the full-scale finite element (FE) model of the vehicle has been established. On basis of the FE model, the impact simulation subject to the 100% frontal impact has been carried out, and the results have been verified with the physical impact test. The analysis of the deformation path and the energy absorption indicates that the M1 vehicle lacks sufficient frontal deformation area and its peak crash acceleration (PCA) is too high, which raises a huge challenge for the sequent development of a safety restraint system. To enhance the crashworthiness of the M1 vehicle, some structural improvements have been implemented, with adding the energy absorbing box, improving the frontal frame parts and enhancing the front door. The frontal collapsing area has been investigated in order to figure out the layout position of the energy absorbing box.
2017-03-28
Technical Paper
2017-01-0476
Seiji Furusako, Masatoshi Tokunaga, Masanori Yasuyama
In order to reduce the weight of automobile body, application of high strength steel sheets is expanding. And also a middle and high carbon steel is expected to be used to lower the environmental impact and cost in the field of automobile steel sheet. However, it is necesarry for its realization to enhance the joint strengh of the steel sheets. In this study, hat-shape components were made by resistance spot welding or arc-spot welding using S45C steel sheet of 1.4mm in thick with strength of 1200MPa grade . Then dynamice three-point bending test was carried out on the components and crashworthiness of them was compared. Absorbed energy of the arc-spot welded component was higher than that of the resistance spot-welded one by 30%. Some spot welds fractured (separated) during the three-point bending test but arc-spot welds did NOT fractured. Arc-spot welding is therefore seemed to be effective to improve strength and toughness of weld for a middle and high carbon steel sheet.
2017-03-28
Technical Paper
2017-01-1470
Prasad S. Mehta, Prasad Tapkir
The crashworthiness of a vehicle is an important factor that needs to be considered during vehicle component design. The components sustaining the axial loads and the traverse loads are the prominent contributor as far as crashworthiness of the vehicle is concerned. The B-pillar is the crucial vehicle component responsible to absorb the side impact during the side car crash, whereas S-rail is supposed to face axial loads. This paper aims to have an optimized material density distribution (topology optimization) as well as thickness variation (Design optimization) in case of the B-pillar and S-rail that have maximum energy absorption during the side crash event of the car. Initially, B-pillar was extracted from the Toyota Camry car model, whereas standard S-rail geometry is considered for the non-linear finite element analysis. The explicit code of LS-DYNA is used to perform non-linear analysis on B-pillar and S-rail. The analysis is performed according to FMVSS regulations.
2017-03-28
Technical Paper
2017-01-0264
Venkatesh Babu, Ravi Thyagarajan, Jaisankar Ramalingam
In this paper, the capability of three methods of modelling detonation of high explosives (HE) buried in soil viz., (1) coupled discrete element & particle gas methods (DEM-PGM) (2) Structured - Arbitrary Lagrangian-Eulerian (S-ALE), and (3) Arbitrary Lagrangian-Eulerian (ALE),are investigated. The ALE method of modeling the effects of buried charges in soil is well known and widely used in blast simulations today Due to high computational costs, inconsistent robustness and long run times, alternate modeling methods such as Smoothed Particle Hydrodynamics (SPH) and DEM are gaining more traction. In all these methods, accuracy of the analysis relies not only on the fidelity of the soil and high explosive models but also on the robustness of fluid-structure interaction. These high-fidelity models are also useful in generating fast running models (FRM) useful for rapid generation of blast simulation results of acceptable accuracy.
2017-03-28
Technical Paper
2017-01-1463
Feng Zhu, Clifford C. Chou
A new design methodology based on data mining theory has been proposed and used in the vehicle crashworthiness design. The method allows exploring the big crash simulation dataset to discover the underlying complicated relationships between response and design variables, and derive design rules based on the structural response to make decisions towards the component design. An S-shaped beam is used as an example to demonstrate the performance of this method. A large amount of simulations are conducted and the results form a big dataset. The dataset is then mined to build a decision tree. Based on the decision trees, the interrelationship among the geometric design variables are revealed, and then the design rules are derived to produce the design cases with good energy absorbing capacity. The accuracy of this method is verified by comparing the data mining model prediction and simulation data.
2017-03-28
Technical Paper
2017-01-1475
Saeed Barbat, Xiaowei Li
On December 2015, The National Highway Traffic Safety Administration (NHTSA) published its proposal to implement U.S New Car Assessment Program (NCAP) changes beginning in 2019 model year. The proposal included a new frontal oblique impact (OI) test protocol which comprises of a new Oblique Moving Deformable Barrier (OMDB), new THOR 50th% male dummy, and a new test configuration? An OMDB of 2,486Kg impacts a stationary target vehicle at a speed of 90Kph at an angle of 15 degrees with a 35% barrier overlap. In vehicle-to-vehicle collisions, the lighter weight vehicle experience higher velocity change, thereby, occupants in the lighter vehicle experience higher injury risk. This paper describes the analyses of a 31 OI tests conducted by NHTSA, in which the target vehicles used were of different sizes and weight distribution ranging between 1034Kg-2624Kg. Deformation Energy (DE) in the OMDP was calculated from the honeycomb deformation and stiffness.
2017-03-28
Technical Paper
2017-01-1468
Do Hoi KIm
Previous studies have dealt with the relationship between the injury criteria of dummies and vehicle drop during high-speed head on collisions. Ultimately, vehicle drops are found to worsen the injury criteria of dummies when exceeding 60mm during high-speed crashes. Also, vehicle drops affected the front side member of the vehicle body the most. The present study dealt with methods of improving vehicle drops by enhancing the connective structure of the front side member, the short gun, and the A pillar. Analyses on various vehicles confirm that arch-shaped front side members are an extremely important factor. Furthermore, if the short gun and A pillar are properly connected at the top of the arch shape on the front side member during crashes, the deformation energy of the vehicle could be converted to energy for lifting the A pillar lower. With a so-called body lift structure, BLS has been applied to the B/C segment vehicles of Hyundai and KIA.
2017-03-28
Technical Paper
2017-01-1466
Claudia De La Torre, Ravi Tangirala, Michael Guerrero, Andreas Sprick
Studies in the EU and the USA found higher deformation and occupant injuries in frontal crashes when the vehicle was loaded outboard (frontal crashes with a small overlap). Due to that, in 2012 the IIHS began to evaluate the small overlap front crashworthiness In order to solve this problem. A set of small overlap tests were carried out at IDIADA’S passive safety laboratory and the importance of identifying the forces applied in each structural element involved in small overlap crash were determined. One of the most important structural elements in the small overlap test is the wheel. Its interaction in a small overlap crash can modify the vehicle interaction at the crash, which at the laboratory the interaction is with a barrier. That interaction has a big influence at the vehicle development and design strategy. In order to study and understand in a better way the wheel kinematics and separation strategy, IDIADA developed with HATCI a small overlap sled test.
2017-01-10
WIP Standard
ARP1897A
This document is prepared as an aid in the selection of clamping devices and their use in aerospace equipment for the installation and support of tubing and wiring.
2017-01-10
Technical Paper
2017-26-0009
Abhinab Mohanty, Rajasekar Ramaraj, Prashant Dhage, Alok Kumar Ray
Abstract Today’s automotive world has moved towards an age where safety of a vehicle is given the topmost priority. Many stringent crash norms and testing methodology has been defined in order to evaluate the safety of a vehicle prior to its launch in a particular market. If the vehicle fails to meet any of these criteria then it is debarred from that particular market. With such stringent norms and regulations in place it becomes quite important on the engineer’s part to define the structural requirements and protect the space to meet the same. If the concept level platform definition is done properly it becomes very easy to achieve the crash targets with less cost and weight impact.
2017-01-10
Technical Paper
2017-26-0017
Celine Adalian, Alba Fornells, Núria Parera
Abstract In the 70’s, to reduce vehicle crash fatalities, NHTSA launched a Program, called NCAP, to compare the safety of cars. This Program was copied in Europe and around the world. It has been demonstrated that this kind of public assessment has forced OEM’s to invest in safety and to develop safer vehicles. Nowadays, NCAPs exist for nearly all regions around the world; all of them with the aim of improving vehicle safety. They apply the philosophy of an “overall rating”. In that way the information aims to be clearer and more general and will help to compare cars. Nevertheless, even though in every NCAP the overall assessment is given by a unique star rating, the specifications and requirements in each protocol are different. Each NCAP has been adapted to each region’s conditions, accidentology and traffic and therefore assessment criteria have their own peculiarities.
2017-01-10
Technical Paper
2017-26-0019
Kantilal P. Patil, Viswanatha Saddala
Abstract The objective of this paper is to minimize occupant injuries in offset frontal crash with pulse characterization, by keeping vehicle front crush space & occupant survival space constant. Crash pulse characterization greatly simplifies the representation of crash pulse time histories. The parameters used to characterize the crash pulse are velocity change, time & value of dynamic crush, and zero cross-over time. The crash pulse slope, peaks, average values at discrete time intervals have significant role on occupant injuries. Vehicle crash pulse of different trends have different impact on occupant injury. The intension of crash pulse characterization study is to come out with one particular crash pulse which shows minimum occupant injuries. This study will have significant impact in terms of front loading on crash development of vehicle.
2017-01-09
WIP Standard
AS5117A
No scope available.
2016-11-18
WIP Standard
AS5187A
SCOPE IS UNAVAILABLE.
2016-11-18
WIP Standard
AS5189A
SCOPE IS UNAVAILABLE.
CURRENT
2016-11-01
Standard
J3058_201611
This SAE Recommended Practice describes the dynamic testing procedures required to evaluate the integrity of patient compartment interior Storage Compartments such as cabinets, drawers, or refillable supply pouch systems when exposed to a frontal, side or rear impact (i.e., a crash impact). Its purpose is to provide component manufacturers, ambulance builders, and end-users with testing procedures and, where appropriate, acceptance criteria that, to a great extent, ensure interior Storage Compartments or systems meet the same performance criteria across the industry. Descriptions of the test set-up, test instrumentation, photographic/video coverage, test fixture, and performance metrics are included.
2016-10-26
WIP Standard
AS6449C
This document establishes the requirements for a dry film lubricant AS6449 lubricant for use on breathing oxygen system and potable water system components, for a temperature range of -90 to +300 °F. This document also establishes the Non-Destructive Test (NDT) procedures and criteria for coated production parts. This document requires qualified products and product applicators.
2016-10-20
WIP Standard
AS5969E
Adding a new "tube class" character to the end of the part string. "No Code" (for use on Ti and CRES) and "D" code (for use on Ti, CRES, AND Aluminum)
2016-08-16
WIP Standard
AS4211E
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4220D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4210E
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4224D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS4807D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications. Correct the “V” dimension for size 10.
2016-08-16
WIP Standard
AS4221D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
2016-08-16
WIP Standard
AS5002D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications..
2016-08-16
WIP Standard
AS5003D
Remove AS85421 performance specification and leave AS85720 performance specification to provide clarification regarding the QPL and associated pressure applications.
Viewing 1 to 30 of 2143

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