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Design optimization of a viscoelastic dynamic vibration absorber using a modified fixed-points theory.
1Department of Mechanical Engineering, The Hong Kong Polytechnic University, 11 Yuk Choi Road, Hung Hom, Kowloon, Hong Kong Special Administrative Region, China.
The Journal of the Acoustical Society of America
|March 3, 2018
Summary
A new viscoelastic dynamic vibration absorber (VDVA) effectively suppresses infrasonic vibrations in heavy structures. This optimized VDVA outperforms traditional designs by utilizing frequency-dependent properties and a modified fixed-points theory for superior vibration reduction.
Area of Science:
- Mechanical Engineering
- Structural Engineering
- Materials Science
Background:
- Traditional dynamic vibration absorbers are ineffective for low-frequency vibrations in heavy structures.
- Infrasonic vibrations pose significant challenges for structural integrity and performance.
- Viscous dampers in conventional absorbers lack the necessary frequency-dependent properties for low-frequency applications.
Purpose of the Study:
- To propose a novel viscoelastic dynamic vibration absorber (VDVA) for effective infrasonic vibration suppression.
- To develop a modified fixed-points theory for optimizing VDVA with frequency-dependent stiffness and damping.
- To demonstrate the superior performance of the proposed VDVA compared to conventional designs.
Main Methods:
- Development of a VDVA incorporating an elastic spring and a viscoelastic damper with frequency-dependent characteristics.
- Application of a modified fixed-points theory to derive optimal design parameters for the VDVA.
- H∞ design optimization to minimize resonant vibration amplitude under harmonic or ground motion excitation.
- Numerical testing of the optimized VDVA using commercial viscoelastic damping materials.
Main Results:
- The modified fixed-points theory successfully addresses the challenge of frequency-dependent stiffness and damping.
- The proposed VDVA allows for independent tuning of stiffness and damping properties.
- Numerical simulations confirm that the optimized VDVA provides significantly greater vibration reduction than conventional designs.
Conclusions:
- The proposed viscoelastic dynamic vibration absorber offers a highly effective solution for suppressing infrasonic vibrations in heavy structures.
- The developed modified fixed-points theory is crucial for optimizing frequency-dependent vibration absorbers.
- The VDVA's ability to decouple stiffness and damping enables superior performance, outperforming traditional absorbers.
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