Modelling a Drop Test of a Landing Gear using a Hybrid Bond Graph

Rebecca Margetts, Roger F. Ngwompo, and Marcelin Fortes da Cruz


Bond Graph, Physical Model, Hybrid Model


A landing gear is a good example of a highly nonlinear multidisciplinary system. Using hybrid modelling, nonlinear behaviour can be abstracted to discontinuous behaviour. Bond graphs are an established and intuitive method for constructing mathematical models of multi-physics dynamic systems. The Hybrid Bond Graph is therefore used here to demonstrate the modelling of a landing gear drop test. A distinction is drawn between structural and parametric discontinuities, represented using controlled junctions and elements. Causally static and dynamic bond graphs are compared. A mixed Boolean mathematical model is obtained from the causally dynamic graph.

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