3次元平板におけるガイド波の散乱解析と実験 (original) (raw)

3次元平板におけるガイド波の散乱解析と実験

2007, Journal of applied mechanics

This paper introduces a method to perform the scattering analysis of guided waves in a 3-D plate by using the mode-exciting method. This method has computational advantage that numerical methods such as FEM and BEM can be used uncoupled with other technique which make the analysis simpler than other methods. We first explain about the theory of guided wave in a 3-D plate and show the scattering-analysis method based on the mode-exciting method. Some numerical examples are shown and verified by experiments. The analysis and experiment results show good agreement.

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三次元設計モデルの積算への利用方法の検討

Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics), 2013

常温水中でのレーザー誘起気泡と数種類の固体平板との相互作用に関する考察

Journal of the Visualization Society of Japan, 2009

In this study a pulsed Nd:YAG laser beam was focused to make a single cavitation bubble near solid plate in distilled water at normal temperature. The behavior of laser-induced buboie was visualized with shadowgraph method by a higli speed camera and analyzed quantitatively. Some plates were settled near the laser induced bubble. In order to observe the feature of laser-induced bubble behavior near the plate materials, we selected materials of plate! aluminum, pumice, and gel in this study. The bubble near rigid materials migrates toward the plate. On the other hand, the buoble near elastic/flexible materials migrates away from the plate, We also focused on the period of motion of laser.induced bubble near plate, and the deformation of elastic/flexible material plate surfaces with laser-induced bubble. The observed results of the bubble behavior have been discussed.

空溝による表面波の減衰効果

BUTSURI-TANSA(Geophysical Exploration), 2007

A trench is sometimes used in order to cut down the ground vibrations caused by traffic, construction works, and factory machines. The shielding effect of vibrations by a trench has been often examined by laboratory experiments using ultrasonic waves and field experiments. Recent developments of personal computers enhance use of numerical analysis. In this study, DEM (discrete element method) is adopted for simulation tool. The reduction ratio of Rayleigh waves after passing through a narrow trench had been proposed by Yoshii (1971) and it is the function of the trench depth. Our simulation results can reproduce this behavior very well. In case of a wide trench, however, there is no empirical relationship describing the reduction behaviors. In this paper, we propose a new equation for Rayleigh wave reduction including the depth and width of a trench based on simulation studies.

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不快音の脳波に及ぼす影響

Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene), 1984