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Study on Band Gap Structure of One Dimensional Phononic Crystals Wang Yan-Lin1, a, Chen Ming-Wen2, b *, Wang Zi-Dong1, c * 1School of Materials Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China 2School of Applied Science, University of Science & Technology Beijing, Beijing 100083, China aWYL1921@yahoo.com.cn, bchenmw@ustb.edu.cn, cwangzd@mater.ustb.edu.cn Keywords: Equivalent masses method; phononic crystal; band gap structure Abstract.
By changing a certain material component parameter or structural parameter respectively we analyze the vibration band gap structure under ensuring the density of the material A is bigger than the material B.
The result is consistent with the numerical results, there has some difference among them, the main cause is that the result obtained by using numerical analysis based on the model is continuously connected among the different materials, and the experimental model is connected by using the screw connection method.
Acknowledgment Work was supported by the National Natural Science Foundation of China (No. 10972030) and the metallurgy research fund of University of Science and Technology Beijing(No. 00009503).
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Wood is a remarkably versatile building material.
The results show that wavelet transform and moving variance can effectively remove noise in the derivative spectra and improve the accuracy of the spectral analysis model, which means the introduction of Near Infrared Spectroscopy has a great prospect of application in the analysis of building materials.
Introduction Wood is the only renewable natural resources that can be repeatedly recycled of today's four major building materials (steel, cement, plastic, wood)[1].
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This method makes it possible to consider parameters of particle damper such as the particle size, ratio and particle material and so on.
Acknowledgments This study is supported in part by the State Key Laboratory of Ocean Engineering Program under the grand number(1005) , the Innovation Foundation of jiangsu university of science and technology for undergraduate and the dectoral scientific research foundation of jiangsu university of science and technology(35011004).
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