Dynamic analysis of a hanger-supported beam with a moving oscillator

Abstract

The dynamic responses of contact force and displacement are analyzed for a hanger-supported, tensioned beam with a moving oscillator. Two types of hanger models are considered in this study: slackness and non-slackness models. The slackness model can possess axial stiffness only when a hanger is subjected to a tensile force, while the non-slackness model has axial stiffness for both tensile and compressive forces. Using the finite element method and the generalized-a time integration method, the dynamic responses of the contact force and moving mass displacement are computed, and the effects of the hanger modeling and system parameters on the responses are investigated. It is found that the slackness of the hangers is helpful in reducing the dynamic contact force between the tensioned beam and the moving oscillator. This paper also shows that the contact forces computed with the slackness model have smaller magnitudes and fewer fluctuations than the forces computed with the non-slackness model. (C) 2013 Elsevier Ltd. All rights reserved.