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| Low frequency vibration reduction design based on an inertial amplification locally resonant phononic crystals |
| ZHANG Yin YIN JianFei WEN JiHong YU DianLong |
| Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology, Changsha 410073 |
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Abstract For low frequency structural vibration reduction, a type of Inertial Amplification Locally Resonant Phononic Crystals (IALRPC) is designed in this paper. Finite Element Method (FEM) in conjunction with Bloch theory is used to study the band structure of IALRPC and the wave transmission in finite IALRPC is also analyzed using FEM. Based on this, the band gaps induced by inertial amplification and by locally resonant mechanism are analyzed and compared. Considering the vibration reduction of a beam frame structure, IALRPC is designed to embed into the frame and significant low frequency vibration reduction is found due to the band gaps of the IALRPC and the introduction of damping by the viscoelastic materials. Furthermore, the design of the IALRPC is optimized to achieve full suppression of the fundamental mode of the frame. Experimental specimen is manufactured and tested. The results show that the IALRPC proposed in this paper can provide an effective new measure for low frequency reduction.
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Received: 02 July 2015
Published: 25 August 2016
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