Generating and validating multibody simulation models of e-bikes for PC-Crash / Entwicklung und Erprobung eines Mehrkörpersystems für E-bikes in PC Crash

The PC-Crash© software for reconstructing traffic accidents by the company DSD offers the opportunity to use multibody models to simulate a realistic behavior of accident participants. Not only predefined multibody models are... [ view full abstract ]

The PC-Crash© software for reconstructing traffic accidents by the company DSD offers the opportunity to use multibody models to simulate a realistic behavior of accident participants. Not only predefined multibody models are available. Furthermore, it is possible to define own models. Due to the fact that no given model for simulating an electric driven bike (E-bike) had existed, the task was to define a new multibody model for E-bikes. A predefined bike model with driver serves as basis for the new model. It was completed by additional elements to an E-bike. Based on real crash tests, the multibody model for E-bikes needs to be confirmed. The aim was to obtain an adequate accordance for both, the acceleration on the upper front fork and on the seat post between crash tests and simulations.

To validate the multibody models (Shape), the Robert Bosch GmbH executed crash tests for different E-bike models. For this E-bike models, different Shapes for PC-Crash© were generated by the Fraunhofer IVI. The fundament of... [ view full abstract ]

To validate the multibody models (Shape), the Robert Bosch GmbH executed crash tests for different E-bike models. For this E-bike models, different Shapes for PC-Crash© were generated by the Fraunhofer IVI. The fundament of all Shapes was a predefined bike model by DSD, which had been completed with the special electric elements (e.g. storage battery, electric engine). The Shapes were defined in length, width, height and weight, depending to the real E-bike. In order to adapt the E-bike behavior in simulation to the crash test behavior, the changing of the properties of bodies and joining elements of the Shape was required. Within the simulation, the properties stiffness and hysteresis of the bodies, the friction and stiffness of the joints elements and the stiffness and damping of the spring-dampers elements got modified.