Mode switching in causally dynamic hybrid bond graphs

R. Margetts, R. F. Ngwompo

Research output: Contribution to journalArticle

2 Citations (Scopus)
112 Downloads (Pure)

Abstract

The causally dynamic hybrid bond graph is extended to the case of mode-switching behaviour. Mode-switching 'trees' of switches and elements are historically used by bond graph practitioners to represent elements with piecewise-continuous functions. This case is defined as 'parametric switching' for the purposes of the hybrid bond graph, since the switching is internal to the element, as opposed to 'structural switching' which alters the model structure. This mode-switching 'tree' is concatenated into a new controlled element which features Boolean switching parameters in the constitutive equation, removing unnecessary complexity from the model. Mixed-Boolean state equations can be derived from the model, which are nonlinear and/or time-varying (and hence not in the familiar Linear Time Invariant Form). It can be seen that controlled elements often have a static causality assignment and leave the model structure unchanged. The result is a concise method for representing nonlinear behaviour as a piecewise-continuous function in the bond graph modelling framework.

Original languageEnglish
Article number1725
Pages (from-to)96-102
Number of pages7
JournalMechatronics
Volume28
Early online date12 May 2015
DOIs
Publication statusPublished - 1 Jun 2015

Keywords

  • Hybrid bond graph
  • Mode-switching
  • Parametric switching
  • Physical system models
  • Switched bond graph

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