Modellierung eines Fahrwerkprüfstandes zur konstruktiven und simulativen Auslegung

Kurzfassung

In the project Next Generation Train (NGT), a concept for a novel high speed train is designed by DLR (German Aerospace Center). To allow continuous low floors and reach the project goals, e.g. energy efficiency and wear reduction, the mechatronic running gears are based on independently driven wheel pairs. In the next step of the development process a 1:1 scale prototype of the running gear is built. Therefore, a test bench is designed to bring the running gear into service. Like this, the operability of the running gear can be assured before going on full speed investigations on roller rigs. In this thesis, a simulation environment consisting of enhanced multibody models is implemented to support the development process of the test bench. At first, three concepts of the test bench are analyzed and a concept with a roller as a replacement for the rail is selected. The running gear and the test bench are modeled using Dymola and the RailwayDynamics Library. With the three operation modes ’straight running’, ’lateral isplacement’ and ’yaw motion’ it is possible to ensure the functionality of the kinematics, actuators and sensors of the running gear and to determine the loads on the test bench. Hence, these operation modes are investigated in the multibody simulations. A parameter study is conducted to reveal the influences of the roller radius, the preload and the velocity on the running gear motion. The simulation results show a design conflict between the roller radius and the realization of the hunting motion. Smaller roller radii increase the risk for the wheels to slip off during the steering motion. Furthermore, the preload has a great impact on the steering ability of the running gear on the test bench. The hunting motion and the incorrect operation modes effect the loads on the test bench the most and has to be considered for the construction of the test bench.