This paper presents a method for choosing the most appropriate contact model from several models, by comparing their efficiency for predicting hysteretic behaviour in different applications. The first part describes an application for a belt tensioner used for automotive engines. The second part concerns an academic application and focuses on a simple case of vibration in the presence of dry friction. The hysteresis loops obtained at contact locations are usually used to reproduce the nonlinear forces transmitted along the contact surface as accurately as possible. Although such techniques can be used when the contact zone is easily accessible, this is not generally possible for real, complex structures. Consequently, different techniques are developed and validated.
One of the most common failure modes for turbomachinery wheels is associated to high-cycle fatigue of blades. A classical way to extend the working life of those structures is obtained through the introduction of specific devices in order to reduce vibrational amplitudes during resonance. Different kinds of components are used such as shrouds and wires within power industry and under platform limiters for aeronautics. Dry friction between the devices and blades induces non linear behaviors and flattens the associated frequency response functions (FRF). Even if this phenomena is now well known, different interpretations are presented in bibliography to explain the origin of this flattening. The most common one is based on the dissipated energy while more recent studies propose a different approach and explain peak flattening by changes in boundary conditions induced by the stick/slip phenomenon. The objective of the proposed study is to progress towards a better understanding of the flattening phenomena during vibration of bladed assemblies in presence of dry friction. A simple case is analyzed in order to show the contribution of respectively energy dissipation and changes of contact state on peak levels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.