A complete strategy for efficient and accurate multibody dynamics of flexible structures with large lap joints considering contact and friction

Florian Pichler, Wolfgang Witteveen, Peter Fischer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This paper deals with the dynamics of jointed flexible structures in multibody simulations. Joints are areas where the surfaces of substructures come into contact, for example, screwed or bolted joints. Depending on the spatial distribution of the joint, the overall dynamic behavior can be influenced significantly. Therefore, it is essential to consider the nonlinear contact and friction phenomena over the entire joint. In multibody dynamics, flexible bodies are often treated by the use of reduction methods, such as component mode synthesis (CMS). For jointed flexible structures, it is important to accurately compute the local deformations inside the joint in order to get a realistic representation of the nonlinear contact and friction forces. CMS alone is not suitable for the capture of these local nonlinearities and therefore is extended in this paper with problem-oriented trial vectors. The computation of these trial vectors is based on trial vector derivatives of the CMS reduction base. This paper describes the application of this extended reduction method to general multibody systems, under consideration of the contact and friction forces in the vector of generalized forces and the Jacobian. To ensure accuracy and numerical efficiency, different contact and friction models are investigated and evaluated. The complete strategy is applied to a multibody system containing a multilayered flexible structure. The numerical results confirm that the method leads to accurate results with low computational effort.

Original languageEnglish
Pages (from-to)407-436
Number of pages30
JournalMultibody System Dynamics
Volume40
Issue number4
DOIs
Publication statusPublished - 1 Aug 2017

Keywords

  • Dry fiction
  • Flexible multibody dynamics
  • Joint contact
  • Model order reduction

ASJC Scopus subject areas

  • Modelling and Simulation
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Control and Optimization

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