Affiliation:
1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, China
2. Department of Civil Engineering, Sichuan University, Chengdu, China
Abstract
This paper presents a combined method to predict structure-borne noise from the railway steel bridge deck damped with constrained layer damping (CLD), in which the frequency-dependent properties of the viscoelastic material are accurately considered through the iterative complex eigenvalue method (ICEM). Then, a 1:4 steel bridge deck model is designed and manufactured, and a series of hammer tests of the CLD-damped steel bridge deck are carried out in a semi-anechoic chamber to verify the proposed method. Then, the noise reduction effect of CLD is discussed in detail. It shows that the overall SPLs at the near field point S-3 and the far field point S-8 are reduced by 7.5 dB and 11.1 dB, respectively, and the noise attenuation rate along with distance is also improved significantly after damped with CLD. Finally, the influences of the key design parameters of CLD on noise reduction are quantitatively analyzed, so as to provide reference for the research and application of CLD in railway bridge engineering.
Funder
National Natural Science Foundation of China
Sichuan University Postdoctoral Interdisciplinary Innovation Fund
the Fundamental Research Funds for the Central Universities
the Natural Science Foundation of Sichuan Province
Subject
Mechanical Engineering,Mechanics of Materials,Ceramics and Composites