Damping Energy Dissipation and Parameter Identification of the Bellows Structure Covered with Elastic-Porous Metal Rubber

Guojian Shen,Min Li,Xin Xue,Giosuè Boscato

doi:10.1155/2021/8813099

Abstract

In order to improve damping energy dissipation of a U-shaped bellows structure, elastic-porous metal rubber as a cover layer was adopted and the corresponding vibration parameters were identified. First, the evolution of energy dissipation characteristics with respect to the changes of amplitude and frequency was investigated through a dynamic experimental test in the bending direction of the covered bellows structure. Second, the conspicuous hysteresis loop characteristics were described while the nonlinear constitutive relation was analytically modelled based on the exact decomposition method. Third, the corresponding parameters on dynamic properties of the covered bellows structure were determined by generalized least-squares estimation. Finally, the prediction results were compared with the measured displacement-restoring force curves to verify the accuracy of the developed dynamic model. The results indicate that the proposed dynamic model associated with the nonlinear constitutive relation for the covered bellows structure can well describe the evolution of the restoring force in terms of amplitude and frequency.

Highlights

In order to improve damping energy dissipation of a U-shaped bellows structure, elastic-porous metal rubber as a cover layer was adopted and the corresponding vibration parameters were identified
The prediction results were compared with the measured displacement-restoring force curves to verify the accuracy of the developed dynamic model. e results indicate that the proposed dynamic model associated with the nonlinear constitutive relation for the covered bellows structure can well describe the evolution of the restoring force in terms of amplitude and frequency
In group 1, the hysteresis loops formed by its elastic restoring force and displacement represent the basic characteristics of damping energy dissipation in the bellows structure covered with elastic-porous metal rubber. e area surrounded by the hysteresis loops is the energy dissipation in one vibration period

Summary

Introduction

In order to improve damping energy dissipation of a U-shaped bellows structure, elastic-porous metal rubber as a cover layer was adopted and the corresponding vibration parameters were identified. E results indicate that the proposed dynamic model associated with the nonlinear constitutive relation for the covered bellows structure can well describe the evolution of the restoring force in terms of amplitude and frequency. There has been growing interest in the usage of metallic material dampers (e.g., elastic-porous metal rubber or entangled wire mesh) to improve the environmental service performance of the pipe structures [5]. Due to the nonlinear damping characteristics of metal rubber, of particular interest and complexity are the dynamic model and the corresponding parameter identification of elastic-porous metal rubber as a vibration damper. E abovementioned efforts provide a trigger for the further investigation on parameter identification of the bellows structure covered with elastic-porous metal rubber Yang et al [22] investigated the vibration reliability characterization and damping performance of annular periodic metal rubber subjected to cyclic dynamic loading, provided an alternative method for the design of a periodic metal rubber damper in terms of individual application. e abovementioned efforts provide a trigger for the further investigation on parameter identification of the bellows structure covered with elastic-porous metal rubber

Methods

Results

Conclusion