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Abstract This work presents the novel concept of Variable‐Order (VO) Calculus through the description of a simple problem in Mechanics. A mathematical definition for the VO‐differential operator that is suitable to mechanical modelling is proposed, and an example concerning the effect of nonuniform viscoelastic frictional forces is described. A numerical method for the solution of Variable Order Differential Equations (VODEs) is proposed. The physical model under study requires mathematical tools that lie beyond the traditional methods of Constant‐Order (CO) differential equations. The VO‐Calculus formulation is compared to a CO‐Calculus model in order to show the limitations of the latter in resolving the transition between the relevant dynamic regimes.
Carlos F.M. Coimbra (Fri,) studied this question.
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