FreeDyn - A Software for Advanced Multibody Simulation: Applications in the Field of Vehicle Dynamics

Research output: Chapter in Book/Report/Conference proceedingsConference contribution

Abstract

In the last few years, the complexity of models in multibody dynamics (MBD) has grown tremendously. In particular, industrial simulations of large systems including several flexible bodies, such as complete vehicles result in models with a vast number of degrees of freedom. In most cases, multibody systems are described by a system of differential algebraic equations (DAE). Due to the algebraic constraints C(q,u,t) = 0, the equations of motion are extended by constraint forces of the form CTq λ, where Cq represents the constraint Jacobian and the vector λ includes the Lagrange multipliers. Moreover, u is a vector of parameters or of time-dependent control signals actuating the system. Virtual prototypes, as the multibody model of a mechanical system may be interpreted, should allow the industrial users to figure out all details and hidden potentials of the system under consideration. However, commercial software packages hardly support such investigations and therefore are not always applicable. Due to the demand for customized methods, e.g., for sensitivity analysis, the development of an Independent research code for MBD (FreeDyn) was started at the University of Applied Sciences Upper Austria. Hence, the developers have the opportunity to directly operate on the program code implementing the multibody model as well as mathematical solution strategies. This contribution especially addresses the application of FreeDyn in vehicle dynamics.
Translated title of the contributionFreeDyn - A Software for Advanced Multibody Simulation: Applications in the Field of Vehicle Dynamics
Original languageGerman
Title of host publicationProceedings of ECCOMAS Thematic Conference on Multibody Dynamics, Duisburg, Deutschland, 2019
Publication statusPublished - 2019
EventECCOMAS Thematic Conference on Multibody Dynamics - Duisburg, Germany
Duration: 15 Nov 201918 Nov 2019

Conference

ConferenceECCOMAS Thematic Conference on Multibody Dynamics
CountryGermany
CityDuisburg
Period15.11.201918.11.2019

Keywords

  • sensitivity analysis
  • vehicle dynamics
  • tire modelling
  • adjoint method

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