Prof. Akira Todoroki Profile

Prof. Akira Todoroki

at Institute of Science Tokyo

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Publications (13)

Proceedings Article | 1 April 2015 Paper

Crack visualization of metallic structures in wide area using time-domain reflectometry with two-dimensional microstrip lines

M. Kawasaki, R. Matsuzaki, Akira Todoroki

Proceedings Volume 9437, 94372K (2015) https://doi.org/10.1117/12.2083823

KEYWORDS: Visualization, Inspection, Finite-difference time-domain method, Optical inspection, Dielectrics, Oscilloscopes, Reflectometry, Numerical simulations, Radio propagation, Electromagnetism

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Proceedings Article | 8 April 2009 Paper

Intelligent tires for improved tire safety based on strain measurements

Ryosuke Matsuzaki, Akira Todoroki

Proceedings Volume 7295, 72952E (2009) https://doi.org/10.1117/12.815403

KEYWORDS: Sensors, Capacitance, Roads, Electrodes, Finite element methods, Gold, Control systems, Chemical elements, Safety, Etching

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Proceedings Article | 30 March 2009 Paper

Self-deployable graphite/epoxy composites space structure with embedded SMA wires

A. Todoroki, K. Kumagai, R. Matsuzaki

Proceedings Volume 7292, 72923A (2009) https://doi.org/10.1117/12.814962

KEYWORDS: Shape memory alloys, Composites, Silicon, Carbon, Epoxies, Resistance, Temperature metrology, Silicon carbide, Electrodes, Matrices

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Proceedings Article | 8 April 2008 Paper

Intelligent tires for improved tire safety using wireless strain measurement

Ryosuke Matsuzaki, Akira Todoroki

Proceedings Volume 6932, 69321A (2008) https://doi.org/10.1117/12.775693

KEYWORDS: Sensors, Roads, Finite element methods, Control systems, Safety, Chemical elements, Telecommunications, Intelligence systems, Wireless communications, Data modeling

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Proceedings Article | 8 April 2008 Paper

Electrical resistance change method for delamination monitoring of CFRP plates: effect of plate scale

A. Todoroki, Nobuo Hirai, Ryosuke Matsuzaki

Proceedings Volume 6934, 693404 (2008) https://doi.org/10.1117/12.776125

KEYWORDS: Electrodes, Resistance, Finite element methods, Error analysis, Carbon, Composites, Reliability, 3D modeling, Visualization, System identification

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Proceedings Article | 2 April 2008 Paper

Self-sensing and self-actuating CFRP structure using partially flexible composites

Keisuke Kumagai, A. Todoroki, Ryosuke Matsuzaki

Proceedings Volume 6929, 69290S (2008) https://doi.org/10.1117/12.775936

KEYWORDS: Resistance, Actuators, Carbon, Silicon, Composites, Epoxies, Silicon carbide, Electrodes, Artificial muscles, Unmanned aerial vehicles

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Proceedings Article | 12 April 2007 Paper

Hingeless CFRP structure by using partially flexible composites

A. Todoroki, Keisuke Kumagai

Proceedings Volume 6526, 65261S (2007) https://doi.org/10.1117/12.717210

KEYWORDS: Shape memory alloys, Carbon, Silicon, Epoxies, Composites, Electrodes, Packaging, Resistance, Silicon carbide, Space operations

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Proceedings Article | 10 April 2007 Paper

Statistical damage diagnosis of in-service structure under high noise environment using multiple reference data

Atsushi Iwasaki, Akira Todoroki, Yoshinobu Shimamura

Proceedings Volume 6530, 65301I (2007) https://doi.org/10.1117/12.715572

KEYWORDS: Diagnostics, Fluctuations and noise, Sensors, Data modeling, System identification, Inspection, Damage detection, Structural health monitoring, Mechanical engineering, Finite element methods

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For the health monitoring of existing structures, modeling of entire structure or obtaining data sets after creating damage for training is almost impossible. This raises significant demand for development of a low-cost diagnostic method that does not require modeling of entire structure or data on damaged structure. Therefore, the present study proposes a low-cost statistical diagnostic method for structural damage detection. The novel statistical diagnostic method is a low cost simple system. The diagnostic method employs system identification using a response surface and the damage is automatically diagnosed by testing the change of the identified system by statistical F test. The statistical diagnostic method consists of a learning mode and a monitoring mode. The learning mode is a preparation mode and is performed to create the standard of the diagnosis. The monitoring mode is a diagnosis mode and is performed to diagnose the structural condition. In the learning mode, reference data are measured from an intact structure. A reference response surface is calculated from the reference data using the response surface method. In the monitoring mode, data are measured from a structure to diagnose and a measured response surface is calculated. The statistical similarity of the reference response surface and the measured response surface is tested using the F-test for the damage diagnosis. When the similarity of the response surfaces is adopted, a conclusion of the diagnosis is intact condition. On the other hand, when the similarity is rejected, the diagnosis concludes the structure was damaged. The system does not require the relation between measured sensor data and damages. The method does not require a FEM model of the entire structure. This method diagnoses slight change of the relation between the measured sensor data. In this study, the health monitoring system of the jet fan was developed to investigate the effectiveness of the proposed method. In this study, field test was conducted using an actual jet fan in a tunnel. In the field test, robustness of the proposed method was investigated. As a result, the structural condition of the jet fan was successfully diagnosed and effectiveness of proposed method was confirmed.

Proceedings Article | 20 March 2006 Paper

Electrical resistance change method for damage monitoring of woven graphite/epoxy laminate

Y. Hirano, A. Todoroki

Proceedings Volume 6176, 617606 (2006) https://doi.org/10.1117/12.658294

KEYWORDS: Resistance, Electrodes, Composites, Copper, Finite element methods, Amplifiers, Solids, Tolerancing, Inverse problems, Reliability

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Proceedings Article | 21 July 2004 Paper

Passive wireless strain monitoring of tire using capacitance change

Ryosuke Matsuzaki, Akira Todoroki

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.539468

KEYWORDS: Capacitance, Sensors, Oscillators, Nondestructive evaluation, Safety, Roads, Electrodes, Inductance, Power supplies

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Proceedings Article | 21 July 2004 Paper

Damage diagnosis for SHM of existing civil structure with statistical diagnostic method

Atsushi Iwasaki, Akira Todoroki, Tsuneya Sugiya, Shinsuke Sakai

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.539467

KEYWORDS: Diagnostics, Sensors, Structural health monitoring, System identification, Data modeling, Damage detection, Fluctuations and noise, Artificial neural networks, Mechanical engineering, Smart structures

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Proceedings Article | 20 July 2004 Paper

Novel zooming method for delamination monitoring of CFRP laminates using electrical potential change

Masahito Ueda, Akira Todoroki, Yoshinobu Shimamura, Hideo Kobayashi

Proceedings Volume 5393, (2004) https://doi.org/10.1117/12.539091

KEYWORDS: Electrodes, Finite element methods, Resistance, Error analysis, Silver, Aerospace engineering, Reliability, Composites, Inverse problems, Visualization

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Proceedings Article | 16 February 2004 Paper

Cost-reduction method for delamination monitoring using electrical resistance changes of CFRP beam

A. Todoroki, M. Ueda

Proceedings Volume 5648, (2004) https://doi.org/10.1117/12.568387

KEYWORDS: Resistance, Finite element methods, Error analysis, Electrodes, Composites, Carbon, Neurons, Artificial neural networks, Sensors, Inverse problems

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Showing 5 of 13 publications

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