A novel approximation method for the solution of weakly nonlinear coupled systems

Johnston, Daniel and Cartmell, Matthew (2023) A novel approximation method for the solution of weakly nonlinear coupled systems. Nonlinear Dynamics, 111 (17). pp. 16271-16292. ISSN 1573-269X (https://doi.org/10.1007/s11071-023-08723-0)

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Abstract

In this paper, we describe and illustrate the application of a novel approximation technique for coupled, nonlinear dynamic systems. The technique begins by obtaining the analytical (or approximate analytical) solutions to the uncoupled system. Then, these solutions are used to approximate particular terms in the fully-coupled, nonlinear system in such a way that the target system is amenable to (approximate) analytical solution algorithms. This work forms part of a larger effort to develop robust control systems for large-scale industrial manipulators. To this end, the final example examined in this work considers the FutureForge manipulator: a state-of-the-art manipulator which forms part of a next-generation forging platform under development at the Advanced Forming Research Centre in Glasgow. To show the breadth of applications of our approach, we also apply it to more widely-recognised models like the Rayleigh and Van der Pol oscillators. In both of these cases, we consider a system of two oscillators each having dynamic behaviour described by Rayleigh/Van der Pol oscillators and coupled together through the resulting damping matrices.

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