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research-article

Transmissibility of bending vibration of an elastic beam

[+] Author and Article Information
Hu Ding

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China
dinghu3@shu.edu.cn

Earl Dowell

Duke University, Durham, NC, 27708, USA
earl.dowell@duke.edu

Li-Qun Chen

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China; Department of Mechanics, Shanghai University, Shanghai 200444, China
lqchen@staff.shu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4038733 History: Received June 18, 2017; Revised October 25, 2017

Abstract

This paper proposes an isolation transmissibility for the bending vibration of elastic beams. At both ends, the elastic beam is considered with vertical spring support and free to rotate. The geometric nonlinearity is considered. In order to implement the Galerkin method, the natural modes and frequencies of the bending vibration of the beam are analyzed. In addition, for the first time, the elastic continuum supported by boundary springs is solved by direct numerical method, such as the finite difference method (FDM). Moreover, the detailed procedure of FDM processing boundary conditions and initial conditions is presented. Two numerical approaches are compared to illustrate the correctness of the results. Vibration transmission by using pure pressures is presented, and proved its rationality. By demonstrating the significant impact, the necessity of elastic support at the boundaries to the vibration isolation of elastic continua is explained. Compare with the vibration transmission of the degraded single-degree-of-freedom (SDOF) system, it is proved that it is necessary to consider the bending vibration when studying the force transmission of the elastic continua. Furthermore, the numerical examples illustrate that the influences of the system parameters on the bending vibration isolation. This study opens up the research on the vibration isolation of elastic continua, which is of profound significance to the analysis and design of vibration isolation for a wide range of practical engineering applications.

Copyright (c) 2017 by ASME
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