Yasuyuki Takeuchi

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Vibration Control of Flexible Structures Based on Impedance Matching Index : Optimal Tuning of Passive Dampers and Dynamic Absorbers(Mechanical Systems)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (2010)

Kenji NAGASE Yasuyuki Takeuchi

This paper is concerned with a new control design methodology for vibration control of flexible structures by the wave control. In the wave control, controllers are usually designed to minimize the reflection coefficient by utilizing the wave analysis. However, because the method is based on the wave analysis, the method has been mainly applied to simple uniform structures. In this paper, to establish a control design method for more complex systems, we propose a control design method based on the impedance matching index, which represents difference of the transfer functions of the closed system and the controller. The index is motivated by the wave analysis and control for uniformly varying ladder networks. Optimal tuning of passive dampers and dynamic absorbers by the impedance matching index is especially considered as a first step for control design. Numerical examples for damped mass-spring systems with auxiliary masses are conducted to show effectiveness of the proposed method.

Mechanical impedance

Tuned mass damper

10.1299/kikaic.76.1452

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Vibration Control of Flexible Structures Based on Impedance Matching Index

IFAC Proceedings Volumes (2011)

Kenji NAGASE Yasuyuki Takeuchi

Mechanical impedance

10.3182/20110828-6-it-1002.00498

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Citations (1)

120. Rotatort Stereo Serial Cerebral Arteriography

Japanese Journal of Radiological Technology (1991)

Takayuki Higo Yoshio Takauchi Hidekatsu Komada Shigeru Ooshio Yasuyuki Takeuchi

10.6009/jjrt.kj00003322906

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A Case of Lung Cancer Which Displayed Tree-like Branching Growth.

Haigan (2002)

E. Takeda Yasuyuki Takeuchi Kiyoyuki Furuse Akira Masaoka

背景. 気管支腔内を発育し, 樹枝状陰影を呈する肺癌はまれである. 胸部レントゲン像上, 樹枝状陰影を呈し, 肉腫様変化を伴った肺癌の1例を経験したので報告する. 症例. 68歳, 男性. 糖尿病で入院加療中であったが, 入院時の胸部レントゲン写真で, 右上葉に樹枝状の陰影を認めた. 気管支鏡検査では右B1は白苔に覆われた腫瘤で完全閉塞しており, 直視下に腫瘤を生検し, 低分化腺癌と診断した. その後右側気胸を合併し, 胸腔ドレナ-ジを行ったが, 右上葉無気肺を呈するに至った. c T2N0M0 staie IBと診断し, 右肺上葉切除術を行った. 腫瘍はB1入口部に発生し, 右上幹にポリープ状に突出しており, 末梢側へは気管支腔内を進展し, さらに気管支壁外にも浸潤増殖したと思われた. 病理組織は, 低分化腺扁平上皮癌であり, 一部肉腫様変化を伴っていた. 結論. 腫瘍が樹枝状陰影を呈したのは, 気管支を鋳型にして, 成長したためと考えられた.

Branching (polymer chemistry)

Tree (set theory)

10.2482/haigan.42.625

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Effects of Heat Treatment for Phase Separation on the Pore Structure of Porous Glasses

NIPPON KAGAKU KAISHI (1973)

Yoshio Morioka Hiroko Kosugi Yasuyuki Takeuchi Jun’ichi Kobayashi Fumio IMOTO

ホウケイ酸ガラス(Na20,5 B20,12.7 SiO2)を熱処理して分相を起こさせ,それを2NHCIで溶出して多孔性ガラスを得た。熱処理条件(温度と時間)の異なる種々の多孔性ガラスについて0Cでベンゼンあるいはメタノールの収着等温線を測定した毛管凝縮理論に基づいて実験結果から細孔構造の変化を検討し,熱処理温度および時間とともに鼠径孔が規則的に増加することから,シリカに富む分相粒が成長すること,分相粒粒間の可溶相が溶出したあとが細孔になることを結論した。このことは分相こ粒径が5～600Aに成長した試料ではHCI溶出量と飽和収着量とが,体積的によく対応する実験事実からも支持された,熱処理温度が500C以下の試料では(1)型の等温線を与え,その主要な細昇半径かは20A以下であり,ベンゼンならびにメタノール分子に対して分子ふるい効果のある微細孔も混在することが明らかになった。この実験結果から得た結論はガラス分相に関する従来の知見と大綱において等しい。毛管凝縮理論に基づく蒸気収着法は細孔検出能がすぐれているからガラスの分相研究に有用なことを明らかにした。

10.1246/nikkashi.1973.5

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3203 Fault Detection for Smart Structures by using Recurrent Neural Networks

The proceedings of the JSME annual meeting (2006)

Yasuyuki Takeuchi Hiroshi Okubo

This paper proposes failure diagnosis algorithms for smart structures by using recurrent neural networks. In this research, a hardware experiment has been conducted to detect failures of a flexible beam by using displacement sensor outputs with model errors and noises, where the malfunction is assumed as a sudden change in the structural parameter. Two detection algorithms are examined ; one uses system identification neural networks, the other is based on spectrum data. The usefulness of these failure detection algorithms is examined both by numerical simulations and by hardware experiments.

Identification

10.1299/jsmemecjo.2006.6.0_115

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Radiation Management for Infectious Waste from Nuclear Medicine Studies

Japanese Journal of Radiological Technology (2003)

Yuji Kondo Yasuyuki Takeuchi KAZUYA MASUMOTO

An industrial waste management service has refused to collect medical waste from our hospital owing to radioactive contamination found in the waste in July 2000. An investigation revealed that the "three-way stopcock" and handling diapers used for radioisotope examination were the radioactive contaminants. We therefore reconsidered the system of medical waste maintenance especially for radioactive materials Since February 2001, we have resumed radiation maintenance by following the manual for the handling diapers of patients administered radiopharmaceuticals issued by five organizations associated with JRS, JSRT, JSNM, JSNMT, and JARPM. A major change was to check the radioactive waste at the individual departments and at a centralized check system This eliminated the problem of dumping radioactive material into medical waste as well as resolving the concerns of the industrial waste management service

medical waste

radioactive contamination

10.6009/jjrt.kj00000922232

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Stability analysis on a delayed SIR epidemic model with density dependent birth process

Yasuyuki Takeuchi Ma W

Epidemic model

Source

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Citations (8)

A38 Vibration Control of Flexible Structures by Impedance Matching Index : Optimal Tuning of Passive Damper and Dynamic Absorber

The Proceedings of the Symposium on the Motion and Vibration Control (2009)

Yasuyuki Takeuchi Kenji NAGASE

This paper is concerned with a control design methodology for vibration control of flexible structures by the wave control. In the wave control, controllers are usually designed to minimize the reflection coefficient by utilizing the wave analysis. However, because the method is based on the wave analysis, the method has been mainly applied to simple uniform structures. In this paper, to establish a control design method for more complex systems, we propose a control design method base on the impedance matching index, which represents the difference of the transfer functions of the closed system and the controller. The index is selected from an observation of the facts for the wave analysis and control for uniformly varying ladder networks. Optimal tuning of passive dampers and dynamic absorbers by the impedance matching index is especially considered as a first step for control design. Numerical example of vibration control of a damped mass-spring system with auxiliary masses is conducted to show effectiveness of the proposed method.

Tuned mass damper

Dynamic Vibration Absorber

Mechanical impedance

Optimal design

10.1299/jsmemovic.2009.11.424

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