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Dependence on the Aspect Ratio of Streamline Patterns in Three-Dimensional Cavity Flows 三维空腔流动中流线型长径比的依赖性
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.51
K. Ishii, S. Adachi
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引用次数: 4
Numerical Study on Wave Propagation in Coupled Pipe and Homogeneous Solid-Liquid Flow 耦合管中波传播及固液均匀流动的数值研究
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.239
K. Nguon, K. Inaba, Hiroto Takahashi, K. Kishimoto
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引用次数: 3
Study on Damping Characteristics of Two Steel Hyperbolic Paraboloidal Shells 两种钢质双曲抛物面壳阻尼特性研究
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.285
Kiyoshi Shingu, Masaki Yukawa, Kiyotoshi Hiratsuka, K. Mitsui, T. Kawashima, N. Kondo, Kiyo Ogawa, T. Irie, Yasunori Nakazawa
Damping is an important nature for vibration of structure. Vibration experiments on actual shell structures were carried out to clarify damping characteristics of the shell structures, and also to aid in preparing a data base on damping ratios of shell and spatial structures for use in dynamic response analysis. The experimental methods are the microtremor observation and the impact vibration experiment, and the analytical method for evaluating damping ratios are the RD technique and the half-power method, respectively.
阻尼是结构振动的一个重要性质。对实际壳结构进行了振动试验,以明确壳结构的阻尼特性,并为壳结构与空间结构的阻尼比进行动力响应分析提供数据基础。实验方法为微震观测和冲击振动实验,阻尼比评估的分析方法分别为RD法和半功率法。
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引用次数: 0
New Numerical Method for Calculation of Flow in a Long Region with Free Surface 自由面长区域流动计算的新数值方法
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.73
Yuko Sato, T. Kawamura
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引用次数: 0
Theoretical Study on a Velocity Slip at an Oscillating Mixed Slip Surface 振动混合滑移面速度滑移的理论研究
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.79
K. Sugiyama
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引用次数: 0
A Design Method for Simple Multi-Period Repetitive Controllers with the Specified Input-Output Frequency Characteristic 给定输入输出频率特性的简单多周期重复控制器设计方法
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.271
T. Sakanushi, K. Yamada, I. Murakami, Y. Ando, S. Matsuura, Jie Hu
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引用次数: 0
Numerical Conformal Mappings onto the Canonical Slit Domains 正则狭缝区域上的数值保角映射
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.317
K. Amano, Dai Okano
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引用次数: 2
Intermediate Reflection between Mach and von Neumann Reflections 马赫反射和冯诺依曼反射之间的中间反射
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.119
S. Kobayashi, T. Adachi
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引用次数: 1
Numerical Conformal Mappings on Rectangular Domains with a Slit 带狭缝矩形域上的数值共形映射
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.333
Dai Okano, Keiichi Endo, K. Amano
天野らの方法は, 等角写像の問題を一対の共役な調和 関数を求める問題に帰着させ,その問題にポテンシャル 問題の解法として知られる代用電荷法を適用するという ものである. 代用電荷法とは, 調和関数を定義域外に置 いた仮想的な電荷が持つポテンシャルの 1次結合で近似 し,電荷の位置と大きさを調整して近似解を構成すると いう方法である3).厳密解が境界を含めて問題領域の外 部にまで調和に拡張されるような場合に, 適切に配置さ れた電荷のもと高い精度の近似解を期待できる. これは, 等角写像の問題において, 境界がなめらかで写像関数に 特異性の現れない場合に電荷を境界から離して置くこと に対応する. したがって, スリットを含む矩形領域のよ うに, 端点に特異性の現れるスリット境界を直接扱うこ とは難しい. また, スリット状の境界を越えた外部には 電荷を置くべき領域が存在しないことも問題となる. 一方, 我々は既に, 曲線スリットを伴う領域の等角写像 の問題に Joukowski 変換を利用して, 代用電荷法による 数値等角写像の方法を適用する方法を提案している . 本研究は, この方法をスリットを伴う矩形領域に用いる ものである.
天野等人的方法是,将等角映射问题归结为求一对共轭的调和函数的问题,在这个问题上应用作为电势问题的解法而被知道的代用电荷法。所谓代用电荷法,就是用定义区外的假想电荷所具有的电势的一次结合来近似调和函数,调整电荷的位置和大小来构成近似解的方法3)。在严密解协调地扩展到包括边界在内的问题区域的外部的情况下,可以期待在适当配置的电荷下高精度的近似解。对应于当边界光滑且映射函数不表现特异性时将电荷从边界放远,因此,像包含狭缝的矩形区域那样,端点上出现特异性的狭缝边界很难直接处理,另外,越过狭缝状边界的外部不存在应该放置电荷的区域也是一个问题。另一方面,我们已经提出了利用Joukowski变换,应用基于代用电荷法的数值等角映射的方法来解决带有曲线狭缝的区域的等角映射问题的方法。本研究将该方法用于带有狭缝的矩形区域。
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引用次数: 0
Study of Quasi Two Dimensional Granular Heaps 准二维颗粒堆的研究
Pub Date : 2012-02-25 DOI: 10.11345/NCTAM.60.225
Jian Chen, H. Matuttis
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引用次数: 5
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Theoretical and applied mechanics Japan
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