Harmonic Forcing of Damped Non-homogeneous Euler-Bernoulli Beams

Document Type

Book Chapter

Publication Date

9-19-2020

Publication Title

Special Topics in Structural Dynamics & Experimental Techniques, Volume 5

Abstract

This work is an extension of previous studies on vibrations of non-homogeneous structures. It also explores the use of logistic functions. In the studies, frequency response functions (FRFs) were determined for segmented structures, using analytic and numerical approaches. The structures are composed of stacked cells, which are made of different materials and may have different geometric properties. Here the steady state response, due to harmonic forcing, of a segmented damped Euler-Bernoulli beam is investigated. FRFs for the system are sought via two methods. The first uses the displacement differential equations for each segment. Boundary and interface continuity conditions are used to determine the constants involved in the solutions. Then the response, as a function of forcing frequency, can be obtained. This procedure is unwieldy. In addition, determining particular integrals can become cumbersome for arbitrary spatial variations. The second approach uses logistic functions to model the segment discontinuities. The result is a single partial differential equation with variable coefficients. Approaches for numerical solutions are then developed with the aid of MAPLE® software. For free-fixed boundary conditions, spatially constant force and viscous damping, excellent agreement is found between the methods. The numerical approach is then used to obtain the FRF for the case of a spatially varying force.

Volume

5

First Page

11

Last Page

23

DOI

10.1007/978-3-030-47709-7_2

Comments

Print ISBN: 978-3-030-47708-0

Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Rights

© The Society for Experimental Mechanics, Inc. 2021

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