Masataka Sawada

Central Research Institute of Electric Power Industry

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Muneo Hori

Japan Agency for Marine-Earth Science and Technology

Kazumoto Haba

Taisei (Japan)

Keietsu Itamiya

National Defense Academy of Japan

Tetsuji Okada

Central Research Institute of Electric Power Industry

Soshi Nishimoto

Central Research Institute of Electric Power Industry

Kenji Kubota

Central Research Institute of Electric Power Industry

Hidenori Yoshida

Fukuoka Tokushukai Hospital

Koichi Shin

Hiroshima City University

Hideyuki Horii

The University of Tokyo

Yuji Yamashita

National Cancer Center Hospital East

Cooperative Institutions

The University of Tokyo

Central Research Institute of Electric Power Industry

Hokkaido University

Tokyo University of Science

University of Tsukuba

Taisei (Japan)

Kobe University

Kyoto University

Osaka University

National Defense Academy of Japan

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STUDY ON APPLICATION OF HIGH PERFORMANCE COMPUTING TO FAULT DISPLACEMENT SIMULATION

Journal of Japan Society of Civil Engineers Ser A2 (Applied Mechanics (AM)) (2017)

Kazumoto Haba Hideaki Sonobe Masataka Sawada Muneo Hori

原子力発電所の安全性を確保するためには，一定の信頼を得る断層変位の評価が求められる．本論文では，高性能計算を用いた数値解析による断層変位評価手法を提案する．また，検証用の計算モデルを用いた断層変位評価を実施し，基本的な断層挙動を整理するとともに，評価手法の有効性を確認する．その結果，地表面の断層変位は外力として入力される主断層底部のずれ変位に対して滑らかに変化せず，入力ずれ変位がある限界値を超えると急激に増大することがわかった．また，断層変位評価において，主断層底部の入力ずれ変位を強制変位として作用する場合には，副断層のずれ変位を過小評価する可能性があるため，ずれ変位を等価節点力として作用させる方法が有効であることが分かった．

10.2208/jscejam.73.i_821

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Citations (2)

ANALYSIS OF HYDRAULIC FRACTURING INJECTION AT HIJIORI HOT DRY ROCK SITE BY MBC MODEL

Doboku Gakkai Ronbunshu (2000)

Masataka Sawada Hideyuki Horii Hidenori Yoshida Jiri VYCHYTIL

高温岩体発電における発電システムの設計では, 水圧破砕によって形成される貯留層の性能を予測することが不可欠である. 水圧の作用により生ずるジョイントのせん断すべり・開口が水圧破砕における岩盤挙動の支配的メカニズムと考えられる. こうしたジョイントの挙動を考慮に入れ, 岩盤空洞掘削の解析手法として実績のあるマイクロメカニクスに基づく岩盤の連続体モデル (MBCモデル) を拡張し, 水圧破砕に対する解析手法の提案を行った. そして, 解析例として1992年に山形県肘折実験場で行われた大規模水圧破砕試験の問題を取り上げ, 解析結果と計測結果を比較することにより, 解析手法の適用性を示した.

Rock burst

10.2208/jscej.2000.659_129

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Citations (1)

Application of High Performance Computing to Probabilistic Fault Displacement Simulation with Uncertainties of Fault and Soil Properties

Journal of Japan Society of Civil Engineers Ser A2 (Applied Mechanics (AM)) (2018)

Kazumoto Haba Masataka Sawada Muneo Hori

10.2208/jscejam.74.i_683

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New Rapid Evaluation for Long-Term Behavior in Deep Geological Repository by Geotechnical Centrifuge—Part 2: Numerical Simulation of Model Tests in Isothermal Condition

Rock Mechanics and Rock Engineering (2016)

Masataka Sawada Soshi Nishimoto Tetsuji Okada

Centrifuge

Bentonite

Infiltration (HVAC)

10.1007/s00603-016-1061-6

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Citations (5)

An Improvement of Transient Response of Dynamic Certainty Equivalent Model Reference Adaptive Control System Based on New Smooth Parameter Projection High Order Tuner

SICE Journal of Control Measurement and System Integration (2013)

Masataka Sawada Keietsu Itamiya

A special adaptation law which has the ability to constrain adjustable parameters of an adaptive controller to the specified convex space is often used in an adaptive control system (In the following, this is referred to as a projection adaptation law). In particular, the projection adaptation law which guarantees the existence of time derivative or high order time derivatives of adjustable parameters is referred to as a smooth projection adaptation law and it is used for an adaptive control system based on the adaptive back-stepping method or the dynamic certainty equivalent principle. In the conventional projection adaptation law, the convex set to be constrained is a hyper-rectangular or a hyper-sphere in order to accomplish a realization of an adaptive controller, an efficient estimation and robust stability of adaptation loop. This paper indicates new two smooth adaptation laws (high order tuner) to improve the transient response of a control system in addition to the ability of conventional restraint. Also, the authors propose design schemes of a model reference adaptive control system using them. They can constrain adjustable parameters to an internal space of hyper-parallelogram. Effectiveness of the proposed scheme is illustrated by the theoretical analysis and simple numerical simulation results.

Transient (computer programming)

10.9746/jcmsi.6.243

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Citations (4)

New Rapid Evaluation for Long-Term Behavior in Deep Geological Repository by Geotechnical Centrifuge. Part 1: Test of Physical Modeling in Near Field Under Isotropic Stress-Constraint Conditions

Rock Mechanics and Rock Engineering (2016)

Soshi Nishimoto Masataka Sawada Tetsuji Okada

Centrifuge

Overburden pressure

Bentonite

Triaxial shear test

10.1007/s00603-016-0972-6

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Citations (8)

Evaluation of long-term behavior in HLW near-field by centrifugal model test

Soshi Nishimoto Tetsuji Okada Masataka Sawada

Source

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Abandoned roadways aged up to 50 years observed in Kushiro Coal Mine, Japan

CRC Press eBooks (2011)

Y. Fujii T. Sugawara Junichi Kodama Y. Ishijima Tamotsu Kiyama

IN-SITU TESTS Field observationFrom the observation of closed roadway, it was clarified that most roadways were completely closed by deflection of roof (Fig. 1, see the last page) and/or floor heave due to plastic deformation of clay and siliceous rock.There observed no significant fractures in the closed parts.On the other hand, a few roadways were left open by the wooden support.No back filling was reached to the open roadways.

10.1201/b11646-180

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A New Smooth Parameter Projection High Order Tuner for Robust Adaptive Control

IFAC Proceedings Volumes (2012)

Masataka Sawada Keietsu Itamiya

Realization (probability)

10.3182/20120620-3-dk-2025.00166

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A robust high-speed position control scheme based on computed torque method for 2 DOF flexible link robot arms

International Journal of Advanced Mechatronic Systems (2013)

Keietsu Itamiya Masataka Sawada

Our group has proposed a high-speed tip position control scheme (Sawada and Itamiya, 2012b) which can be applied to both a flexible link robot arm and a rigid link robot arm. It can be regarded as a natural extension of the computed torque method for a rigid link robot arm. This method can achieve a high-speed position control for 2 DOF flexible link robot arm when the exact model of the controlled object is known. However, this method does not have robustness to modelling errors. In this paper, we propose an adaptive identification method in order to decrease the modelling error from the control system in which a nominal control law is used. Then, we use the closed loop adaptive identification, considering the movable range of the robot arm. As a result, the high-speed position control can be achieved by using parameter estimates. Its validity of the proposed scheme is shown by a stability analysis and is also illustrated by the experimental results on the frequency response of the link angle and that of the deflection angle.

Robustness

Arm solution

Position (finance)

10.1504/ijamechs.2013.055258

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Citations (1)