PSI - Issue 24

Dario Vangi et al. / Procedia Structural Integrity 24 (2019) 423–436 D. Vangi et al. / Structural Integrity Procedia 00 (2019) 000–000

434

12

Fig. 11. Representation of the impacts on the CMI- V r PDOF plane for case study 1-3, in case of no intervention (a), 100% braking action (b) and adaptive logic (c).

A specially developed software is firstly introduced, set up to analyse the behaviour of an ADAS device implement ing the proposed IR-based criteria: the software relies on a database in which the outcomes associated with various combinations of braking and steering are collected, in numerous scenarios of impending crashes between motor vehi cles; since the injury outcome (i.e., IR) depends on the velocity change ∆ V experienced by the vehicle in the eventual impact, the database has been compiled using a reduced order dynamic model providing for simulation of kinematics and impact phase between the vehicles. The use of an embedded database allows identifying the best intervention in a short time, i.e., the time necessary to access the database (some milliseconds): this solution is to be preferred with a view to an onboard vehicle implementation of the criteria. Referring to three case studies, it has been proven that the IR-based criteria for ADAS activation allow the vehicle to optimally handle highly critical road scenarios, specifically when collision cannot be averted: adapting to the scenario evolution resulting from actions of the opponent vehicle’s driver, the system leads to eccentrical impact configurations; this is compatible with low values of ∆ V and IR as a consequence.