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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

A Development of the CAE Process for the AEB-Occupant Integrated Safety System

The individual performance development of an active safety system and a passive safety system may lead comprehensive safety performance insufficient possibilities in the scenario of a variety of collisions. The independently developed active safety systems and passive safety systems result in the lack of passenger protection performance when a collision accident occurs. In order to complement this, the sharing of the collision prediction information or the optimization of the active/passive safety systems should be conducted for the injury reduction of passengers. The integrated CAE (Computer Aided Engineering) process for AEB (Autonomous Emergency Braking), ASB (Active Seat Belt) and the airbag system is composed of four major components such as a sensor model, traffic simulation model, vehicle dynamics model and occupant simulation model. In cooperation with each component, the deceleration characteristics of the vehicle are extracted at the time of AEB operation in certain traffic conditions. By utilizing the extracted vehicle deceleration characteristics, the kinematics analysis of passengers can be carried out. Moreover, the passenger injury at a collision accident after the emergency braking can be simulated and the reduction of injury can be achieved by the activation of the restraint system before the collision accident. Pre-crash seat belts or active seat belt reduce the forward movement of passengers by activating a seat belt retraction before the collision. Neck extension moment and neck shear force reduction effect through the reduction of forward movement can also be expected. In this study, coupled simulation of the ASB control logic and the MADYMO occupant simulation model is developed in order to adjust the seat belt retraction strength before collision. A scenario is modeled for a situation of applying a 1g brake with an initial velocity of 80 km/h to simulate a 56km/h full frontal crash to a stationary vehicle in real world. The initial dynamic behavior or movement of the vehicle before a crash is simulated by using the integrated active-passive safety simulation model. This simulation result data is used as initial conditions of the MADYMO occupant simulation. The analysis of injury reduction effect is performed by the belt retraction control of the ASB. The AEB simulation environment is developed by using the MATLAB / Simulink, CarSim and PreScan. The EuroNCAP AEB assessment scenario-based vehicle test data was compared with the results of MiLS. It is possible to obtain vehicle deceleration results similar to the actual vehicle test. Using the deceleration data of the vehicle during emergency braking through the AEB simulation, it was possible to predict the posture change in the passenger. Coupled Simulation between the ASB and passenger model can simulate the posture control of the passenger by the ASB control. It is possible to confirm the positive effect of injury and kinematics of passengers due to the presence or absence of the ASB function. The present study can be used for prediction of the passenger kinematics caused by AEB activation and for the study of the restraint system in order to reduce injury during forward collision after emergency braking.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: 6p
  • Monograph Title: 25th International Technical Conference on the Enhanced Safety of Vehicles (ESV): Innovations in Vehicle Safety: Opportunities and Challenges

Subject/Index Terms

Filing Info

  • Accession Number: 01650152
  • Record Type: Publication
  • Files: TRIS, ATRI, USDOT
  • Created Date: Nov 1 2017 9:09AM