A Bayesian Estimate of Vehicle Safety Performance

2005 ◽  
Author(s):  
L. Gu ◽  
G. Li ◽  
J. Abramczyk ◽  
J. Prybylski
Keyword(s):  
Safety Performance ◽  
Bayesian Estimate ◽  
Vehicle Safety

Real-Time Detection of Adhesion Coefficient between Tire and Road

2012 ◽  
Vol 249-250 ◽  
pp. 109-112
Author(s):  
Kui Yang Wang ◽  
Jin Hua Tang ◽  
Guo Qing Li ◽  
Chuan Yi Yuan
Keyword(s):  
Load Transfer ◽  
Detection Method ◽  
Safety Performance ◽  
Vehicle Safety ◽  
Position Sensor ◽  
Vertical Load ◽  
Adhesion Coefficient ◽  
Vehicle Load ◽  
Motion State ◽  
Brake Force

Adhesion coefficient between tire and road is one of important factors which influence vehicle safety performance. On the basis of theoretical analysis, the detection method of adhesion coefficient based on brake-by-wire is put forward. Brake force is estimated according to pedal position sensor, vehicle braking deceleration is detected through MMA6260Q acceleration sensor. Motion state of tire is distinguished according to brake force and road braking force, vertical load of tire is received in view of formula on vehicle load transfer. Adhesion coefficient used for sliding area is got and taken as adhesion coefficient of road. Analysis shows that the detection method may identify adhesion coefficient between tire and road accurately, and has certain practical value.

scholarly journals Realistic Reference for Evaluation of Vehicle Safety Focusing on Pedestrian Head Protection Observed From Kinematic Reconstruction of Real-World Collisions

2021 ◽  
Vol 9 ◽  
Author(s):  
Guibing Li ◽  
Jinming Liu ◽  
Kui Li ◽  
Hui Zhao ◽  
Liangliang Shi ◽  
...  
Keyword(s):  
Head Injury ◽  
Impact Velocity ◽  
Real World ◽  
Contact Time ◽  
Injury Risk ◽  
Safety Performance ◽  
Contact Boundary ◽  
Vehicle Safety ◽  
Pedestrian Protection ◽  
Vehicle Impact

Head-to-vehicle contact boundary condition and criteria and corresponding thresholds of head injuries are crucial in evaluation of vehicle safety performance for pedestrian protection, which need a constantly updated understanding of pedestrian head kinematic response and injury risk in real-world collisions. Thus, the purpose of the current study is to investigate the characteristics of pedestrian head-to-vehicle contact boundary condition and pedestrian AIS3+ (Abbreviated Injury Scale) head injury risk as functions of kinematic-based criteria, including HIC (Head Injury Criterion), HIP (Head Impact Power), GAMBIT (Generalized Acceleration Model for Brain Injury Threshold), RIC (Rotational Injury Criterion), and BrIC (Brain Injury Criteria), in real-world collisions. To achieve this, 57 vehicle-to-pedestrian collision cases were employed, and a multi-body modeling approach was applied to reconstruct pedestrian kinematics in these real-world collisions. The results show that head-to-windscreen contacts are dominant in pedestrian collisions of the analysis sample and that head WAD (Wrap Around Distance) floats from 1.5 to 2.3 m, with a mean value of 1.84 m; 80% of cases have a head linear contact velocity below 45 km/h or an angular contact velocity less than 40 rad/s; pedestrian head linear contact velocity is on average 83 ± 23% of the vehicle impact velocity, while the head angular contact velocity (in rad/s) is on average 75 ± 25% of the vehicle impact velocity in km/h; 77% of cases have a head contact time in the range 50–140 ms, and negative and positive linear correlations are observed for the relationships between pedestrian head contact time and WAD/height ratio and vehicle impact velocity, respectively; 70% of cases have a head contact angle floating from 40° to 70°, with an average value of 53°; the pedestrian head contact angles on windscreens (average = 48°) are significantly lower than those on bonnets (average = 60°); the predicted thresholds of HIC, HIP, GAMBIT, RIC, BrIC2011, and BrIC2013 for a 50% probability of AIS3+ head injury risk are 1,300, 60 kW, 0.74, 1,470 × 104, 0.56, and 0.57, respectively. The findings of the current work could provide realistic reference for evaluation of vehicle safety performance focusing on pedestrian protection.

Developments in Lightweight Aluminum Alloys for Automotive Applications: 2001-2005

2006 ◽  
Keyword(s):  
Mechanical Properties ◽  
Fuel Efficiency ◽  
Physical And Mechanical Properties ◽  
Safety Performance ◽  
Automotive Application ◽  
Vehicle Safety ◽  
Automotive Applications ◽  
Lightweight Materials ◽  
The Past ◽  
Development Evaluation

The use of lightweight materials in automotive application has greatly increased in the past two decades. A need to meet customer demands for vehicle safety, performance and fuel efficiency has accelerated the development, evaluation and employment of new lightweight materials and processes. The 50 SAE Technical papers contained in this publication document the processes, guidelines, and physical and mechanical properties that can be applied to the selection and design of lightweight components for automotive applications. The book starts off with an introduction section containing two 1920 papers that examine the use of aluminum in automobiles.

Simulation Analysis of Stiffness of Automotive Joint

2013 ◽  
Vol 275-277 ◽  
pp. 812-818
Author(s):  
Jun Liao ◽  
Yan Feng
Keyword(s):  
Performance Analysis ◽  
Simulation Analysis ◽  
Joint Stiffness ◽  
Safety Performance ◽  
Vehicle Safety ◽  
Vehicle Design ◽  
Analysis Model ◽  
Analysis Software ◽  
Body Joint

In order to evaluate the reliability of vehicle design and vehicle safety performance, analysis software is applied to establish the analysis model of automotive joint stiffness; Body joint stiffness of design vehicles and benchmark vehicles; Reasonable and feasibility of body joint stiffness of design vehicles are verified by comparison.

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