DLR’s Vehicle System Dynamics group has a long tradition in the computational analysis of railway vehicles’ dynamics. The group’s main focus used to be on the development of software tools for the efficient analysis of general mechanical systems with a special emphasis on the dynamics of ground vehicles like automobiles, railway vehicles and aircraft landing gears. The respective research activ...

The dynamics of surface vehicles such as boats and ships, when modeled a rigid body, is complex it strongly nonlinear involves six degrees freedom. We are particularly interested in the steering decoupled from pitching rolling basis our research on unmanned autonomy. Steering has been traditionally using linear Nomoto’s model, which however does poor job capturing real phenomena. On other hand,...

As reported in earlier work, methods for hybrid optimal control can be used for optimal path planning of multi-agent systems. This paper considers a multi-vehicle transport scenario in which a hybrid model is used to represent the continuous dynamics of the vehicle motion and the dynamics arising from the docking-events between vehicles and a transported object. The decisions on the vehicles’ h...

In this paper, the impact of vehicles in road tunnel on smoke spread in case of fire is illustrated using the FDS (Fire Dynamics Simulator) system. FDS is a CFD-based fire field model capable to simulate fire in various environments capturing a big variety of physical processes related to fire. A set of simulations of fire in a 300 m long two-lane single directional road tunnel with longitudina...

This paper presents a method to control height and speed of fixed wing unmanned aerial vehicles (UAVs) using MATLAB platform. The mathematical dynamic model of Six Degrees of Freedom (6-DOF) aircraft is nonlinear and it is linearized about a flight condition. System is divided into two Multi Input Multi Output (MIMO) sub models. First model controls the longitudinal dynamics and second model is...

ABSTRACT The quality of ride is predominantly controlled by the design of the secondary suspension in rail vehicles. That is why air springs are increasingly important suspension component in rail vehicles. This is necessary for higher preload, higher speed as well as improved ride dynamics and noise levels. These necessities have created an interest for modeling the air springs for the simulat...

In this work we present a study about the issues related to the penetr ation of alternative fuel vehicles in the colombian mar ket. Currently there is a need to change the vehicle global market to cleaner energy sources in order to prevent an increase in global warming. In the long run, the goal is to replace fossil fuels with green ones. We implemented this in a ...

the aerodynamics of road vehicles has frequently been studied in simplified geometries to separate the effect of various components on aerodynamic drag and on near wake flow dynamics. in this work, the characteristics of the near wake of a notch-back car model were investigated, using hot-wire anemometer. the main objectives of this study are to gain a better understanding of the flow structure...