کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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286949 | 509526 | 2016 | 13 صفحه PDF | دانلود رایگان |

In a previous paper (2012) we presented experimental results proving that the critical frequency fCfC predicted by Timoshenko beam theory indeed exists. We also showed that for frequencies f smaller than fCfC the spectrum is formed by almost equally spaced levels whereas for f>fCf>fC the spectrum consists of pairs of eigenvalues very close to each other as predicted by numerical solutions of Timoshenko׳s equation: we shall refer to them as Timoshenko doublets. In this work we measure for the first time experimental dispersion relations. For this purpose it was necessary to obtain normal-mode amplitudes with a high precision, which was done with a new experimental setup developed by us. We found that experimental dispersion relations coincide very well with theoretical predictions. Furthermore, we provide an explanation of Timoshenko doublets.
Journal: Journal of Sound and Vibration - Volume 375, 4 August 2016, Pages 187–199