PTW Passive Safety: Numerical Study of Standard Impact Scenarios with Rider Injury Risk Assessment 2020-01-0930
Powered two-wheeler (PTW) drivers and passengers are among the group of vulnerable road users (VRU). This group uses the road transportation system together with other better-protected users such as passenger cars and truck drivers. The main vulnerability of PTW driver lies in their unequal position during the crash, due to the inability of application of the crashworthiness concept during the PTW vehicle design. This inequality could be somehow mitigated by the design of personal protective equipment (PPE). Mostly the design of the PPE's is led by the standards which often are obsolete and takes into account only simple drop-tests (ECE 22.05). Those test did not take into account complicated kinematics of the motorcycle accidents and biomechanics of the human body.
The authors propose a virtual approach for the PTW rider injury risk assessment, which coupled with the pre-impact conditions, could be used for the new PPE protection standards preparation. In this paper, authors want to present a numerical study on most common PTW Impact Scenarios, which are described in ISO 13232. The simulations of the accidents were conducted in the VPS numerical environment (PAM-Crash explicit solver). Accidents participants, namely: opposite vehicle (OV)- modelled by finite element method (FEM) approach, powered two-wheeler (PTW)- modelled by multi-body system (MBS) approach, PTW driver - represented by hybrid FE-MBS human body model VIRTHUMAN and a helmet (modelled by FE approach) - which is the only PPE enforced by the law, were coupled to represent the 7 most common accident scenarios. Due to the complexity of the OV FE model, there was a necessity of the model simplification and re-validation, which also was done in this work. The results of the simulations were examined with special emphasis on realistic representation of real accident kinematics. In each configuration, an injury risk assessment was done on the PTW driver model. The assessment was done based on injury criteria used by the NCAP. The paper shows that virtual approach using the VIRTHUMAN human body model could be used for simulation of PTW accidents. The results of this paper could be used for future PPE design.
Tomasz Bonkowski, Ludek Hyncik, Wenle Lv
University of West Bohemia, Tianjin University of Science and Technology