45 On the Behaviour of Structures with Many Nonlinear Elements 519 Fig. 45.16 FRF generated in the same manner as Fig. 45.13 investigating5 108 <k 3 <1 10 10 Nm 3 Fig. 45.17 FRF generated in the same manner as Fig. 45.14 investigating5 108 <k 3 <1 10 10 Nm 3 system from which analogies may potentially be drawn with methods such as SEA. This order emerges more readily with increasing numbers of nonlinearities in the system and the positions of those nonlinearities become less significant as the number increases. It is very clear that this paper has only scratched the surface of this issue and a great deal of further work remains to be done to confirm the results presented here and to begin the process of theoretical explanation.
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