4.2.9 Non-stationary vibrations and uncertainty of systems with friction

Friction-induced vibrations usually exhibit non-stationary characteristics. This can be due to the unsteady interactions at the interface and the transition of instantaneous modes of the system due to the operational condition changes such as loading or unloading. Sometimes the friction changes unexpectedly after a period of relatively steady behavior. Such complex behavior cannot be explained or predicted by a simple friction model. The transient change in dynamic systems occur in many ways, for example:

1. operational condition change, e.g. load change results in transient contact pressure change, which may lead to transient mode coupling of two sliding components; ...

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