Active Damping of Railway Carbody Vibrations with Piezoelements

This paper presents a methodology for the simulation and control of smart structures with piezoceramic patches by means of multibody dynamics. A theoretical background is mentioned adapting a modal multifield approach. Then a methodology for the control design is proposed. The methodology includes the optimisation of actuator placement, which is based on modal representation of the elasticity. The methodology is applied for simulation and control synthesis of an active damping for a railway carbody. The application example illustrates the implemented process chain. This procedure provides a complex development environment for the simulation, optimisation and control design of elastic structures with smart materials

A modal multifield approach for an extended flexible body description in multibody dynamics

This paper presents a new methodology to simulate the behaviour of flexible bodies influenced by multiple physical field quantities in addition to the classical mechanical terms. The theoretical framework is based on the extended Hamilton Principle and an adapted modal multifield approach. Furthermore, the use of finite element analysis for the necessary data pre-processing is explained. Numerical solution strategies for the coupled system of differential equations with different time scale properties are mentioned. The method is applied to simulate a structure with distributed piezo-ceramic devices inducing an additional electrostatic field. Two thermo elastic problems, which have to consider the influence of spatial temperature distribution, also demonstrate the benefits of the present approach

Global Chassis Control: Integration Synergy of Brake and Suspension Control for Active Safety

The paper deals with the investigation of integration synergy of brake and suspension control for reduction of the stopping distance. The basic idea is to take a controllable suspension and to optimize it for decrease of road-tyre force fluctuation. A nonlinear suspension control is proposed for this task. The outlined concept is implemented in a multibody simulation environment and simulation experiments verify its contribution

Overview of Coupling of Multibody and Control Engineering Tools

The role of Computer Aided Engineering in vehicle development has been significantly increased during the last decade. Specialised simulation tools became very complex, however, growing demands on complexity and particularly interdisciplinary of vehicles and their simulation models have led to a number of approaches trying either to develop multidisciplinary simulation tools or to connect various specialised simulation tools by interfaces. This paper addresses some aspects of interconnection of the specialised simulation tools as one possibility for simulating complex mechatronic vehicle systems. It classifies the interfaces between specialised software packages in general, mentions some historical development of the interfacing and further discusses the examples of the implemented couplings between the Multibody System codes and Computer Aided Control Engineering tools. Finally, the performance of selected interfaces is compared on an example simulation of a controlled vehicle suspension

Simulations with LS-DYNA for Registration Approval of a Coach according to ECE R66 Regulation

During the last years the increasing number of fatal coach accidents with tragic consequences for passengers showed the importance of passive safety in addition to the driver’s competence and active safety. In the European countries the certification of sufficient deformation strength when overturning is compulsory for the approval of a coach according to the ECE R66 regulation. The certification is granted after positive results from crash tests or computer simulations with partial or full bus structure. The ECE R66 regulation defines a survival space for the passengers which must remain intact after the accident. The tests specify either the overturning of the vehicle structure from a tilting platform or the impact of a plate on the coach structure as it would correspond to the crash of the structure when falling onto the ground. Since such tests with real vehicle structures are costly and computer efficiency, on the other hand, is becoming increasingly better and cheaper, crash simulations will play a more important role for the approval in the future. This paper will present different LS-DYNA – time simulations of the overturning test with a segment of a bus structure according to ECE R66 and time simulations with a pivoted plate hitting with the same kinetic energy against the structure as the model falling from the tilting platform and crashing onto the floor. Several modelling configurations with deformable and rigid undercarriage, with different friction coefficients of the contact ground-structure, are simulated. These calculations shall serve as a preparation for future calculations to obtain the necessary certification. Unfortunately no experimental results are available at present to enable the comparison between hardware test and computer simulation. However, the experience gained with tilting tests of similar coach structures in the past indicates the trustworthiness of the calculations. As these experiences are published on the panel of a users’ meeting, this paper goes more then usual into detail regarding the modelling and the difficulties in simulations which the authors, until that time unfamiliar with LS-DYNA, has to overcome. A short introduction to the variable test possibilities explained in regulation ECE R66 is given

Multi-Objective Suppression of Vehicle Suspension Vibration.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Increasing Safety of Automated Driving by Infrastructure-Based Sensors

This paper describes the development of an intelligent infrastructure, a test field, for the safety assurance of automated vehicles within the research project Ingolstadt Innovation Laboratory (IN2Lab). It includes a description of the test field architecture, the RoadSide Units (RSU) concept based on infrastructure-based sensors, the environment perception system, and the mission control system. The study also proposes a global object fusion method to fuse objects detected by different RSUs and investigate the overall measurement accuracy obtained from the usage of different infrastructure-based sensors. Furthermore, it presents four use cases: traffic monitoring, assisted perception, collaborative perception, and extended perception. The traffic monitoring, based on the perception information provided by each roadside unit, generates a global fused object list and monitors the state of the traffic participants. The assisted perception, using vehicle-to-infrastructure communication, broadcasts the state information of the traffic participants to the connected vehicles. The collaborative perception creates a global fused object list with the local detections of connected vehicles and the detections provided by the roadside units, making it available for all connected vehicles. Lastly, the extended environment perception monitors specific locations, recognizes critical scenarios involving vulnerable road users and automated vehicles, and generates a suitable avoidance maneuver to avoid or mitigate the occurrence of collisions

Implementation of Truck Prototype for Aachen Workshop.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi