Dynamics of structural systems with various frequency-dependent damping models

doi:10.1007/s11465-015-0330-5

Front. Mech. Eng.

2015, Vol. 10

Issue (1) : 48-63 https://doi.org/10.1007/s11465-015-0330-5

RESEARCH ARTICLE

Dynamics of structural systems with various frequency-dependent damping models

Li LI,Yujin HU(

),Weiming DENG,Lei LÜ,Zhe DING

School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

The aim of this paper is to present the dynamic analyses of the system involving various damping models. The assumed frequency-dependent damping forces depend on the past history of motion via convolution integrals over some damping kernel functions. By choosing suitable damping kernel functions of frequency-dependent damping model, it may be derived from the familiar viscoelastic materials. A brief review of literature on the choice of available damping models is presented. Both the mode superposition method and Fourier transform method are developed for calculating the dynamic response of the structural systems with various damping models. It is shown that in the case of non-deficient systems with various damping models, the modal analysis with repeated eigenvalues are very similar to the traditional modal analysis used in undamped or viscously damped systems. Also, based on the pseudo-force approach, we transform the original equations of motion with nonzero initial conditions into an equivalent one with zero initial conditions and therefore present a Fourier transform method for the dynamics of structural systems with various damping models. Finally, some case studies are used to show the application and effectiveness of the derived formulas.

Keywords damping viscoelasticity dynamic analysis mode superposition method Fourier transform method

Corresponding Author(s): Yujin HU

Issue Date: 01 April 2015

Cite this article:

Li LI,Yujin HU,Weiming DENG, et al. Dynamics of structural systems with various frequency-dependent damping models[J]. Front. Mech. Eng., 2015, 10(1): 48-63.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-015-0330-5
https://academic.hep.com.cn/fme/EN/Y2015/V10/I1/48

Fig.1 A glass fiber reinforced resin matrix hybrid composite material

Fig.2 The composite material is tested by three point bending load

Tab.1 Identified damping parameters of the Biot damping model for the material at 94^?C

Fig.3 Storage modulus and loss modulus obtained from the experimental test and the Biot damping model

Fig.4 A floating raft isolation system

Fig.5 Displacement, velocity and acceleration of the first DOF

Fig.6 A frequency-dependent damped system with repeated eigenvalues

Fig.7 FRF measured at the first DOF

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