Simulationsgestützte Lastannahmen für Schienenfahrzeugdrehgestelle

• Simulation based design load calculation for railway vehicle bogies

Schöler, Frédéric Jean-François; Corves, Burkhard (Thesis advisor); Stichel, Sebastian (Thesis advisor)

1. Auflage. - Aachen : Aprimus Verlag (2019)
Book, Dissertation / PhD Thesis

In: Getriebetechnik, Maschinendynamik und Robotik
Page(s)/Article-Nr.: 1 Online-Ressource (x, 144 Seiten) : Illustrationen

Dissertation, RWTH Aachen University, 2018

Abstract

The development of a lightweight, energy saving and at the same time safe design is one of the biggest challenges in the layout process of rail vehicle bogies. The components have to be designed in such a way that with minimum weight they outlast the planned vehicle operation. For the dimensioning and strength assessment design loads are needed representing the loads occurring during operation as accurately as possible. In the present doctoral thesis, a new methodology for the multibody simulation based calculation of representative design loads for railway vehicle bogies was developed. For the simulations, representative scenarios are needed, which can either be derived from measurement data obtained under operational conditions or which can also be synthetically generated. Both possibilities were investigated within this thesis. For the creation of measurement data based scenarios a new method to determine the track layout from measured signals of track curvature and superelevation was developed. In addition, the track irregularities were calculated from the measured axle box accelerations and the signals of the driving conditions were adapted in order to conduct the simulations. The procedure was applied using a representative part of the measurement data generated by using a reference vehicle. The loads determined through simulation were compared to those recorded during the measurements in use. The results show that making use using of scenarios based on existing measurement data allows for the calculation of bogie loads with great accuracy. During the development of new bogies, suitable measurement data of comparable vehicles performing the specific operation is often not available. In that case, synthetic scenarios taking into account the planed operational conditions as accurately as possible have to be used. In this context it is essential to know the influence of the different operational parameters on the different bogie loads. Therefore, a simulation based sensitivity analysis was conducted to determine the most important operational parameters of the track layout, the driving conditions and the track irregularities. Based on the results of the sensitivity analysis, a method for the generation of representative synthetic scenarios on the basis of statistical distributions of the most important operational parameters was developed. Statistical distributions of operational parameters are, unlike measured data, more frequently available and can be adapted to changing operating conditions. The simulations carried out for the validation show that the methodology developed within this thesis permits to determine the bogie loads with a high level of accuracy and thus to determine representative design loads without disposing of accurate measurement data. In summary, the methods developed within this thesis create the prerequisite for the multibody simulation based calculation of representative operation dependent design load. This increases the security and reliability in the development process, allows customer-oriented optimization of designs and permits the development of innovative railway vehicle bogies.

Institutions

• Chair and Institute of Mechanism Theory, Machine Dynamics and Robotics [411910]