Kenji AMAYA
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View article: Crack Growth Prediction Based on Uncertain Parameters Using Ensemble Kalman Filter
Crack Growth Prediction Based on Uncertain Parameters Using Ensemble Kalman Filter Open
We are developing a method that will enable the estimation of crack shapes in such structures as power equipment and social infrastructure with greater precision as well as the prediction of crack growth life under conditions of uncertaint…
View article: Numerical Analysis of Stainless Steel of Crevice Corrosion Initiation Behavior with Varying External Potentials and Initial Crevice Gaps
Numerical Analysis of Stainless Steel of Crevice Corrosion Initiation Behavior with Varying External Potentials and Initial Crevice Gaps Open
The potential, current density, pH, and crevice profile distribution within the crevice structure of stainless steel in seawater were numerically analyzed. The crevice corrosion phenomena were mathematically modeled with the initial bounda…
View article: Crack Identification by Digital Image Correlation Method Using Crack Shape as Prior Information
Crack Identification by Digital Image Correlation Method Using Crack Shape as Prior Information Open
A new crack identification method that estimates the cracks in invisible locations based on the surface deformation measured by digital image correlation (DIC) is developed. An inverse problem is setup to estimate such invisible cracks fro…
View article: Identification of Crack Shapes by Digital Image Correlation Using Joint Estimation Maximum a Posteriori Method
Identification of Crack Shapes by Digital Image Correlation Using Joint Estimation Maximum a Posteriori Method Open
A method that estimates invisible cracks from the surface based on the surface deformation measured by digital image correlation (DIC) is being developed. An inverse problem is setup to estimate such invisible cracks from the surface defor…
View article: Identification of Cracks Using Crack Shape as Prior Information and Digital Image Correlation Method
Identification of Cracks Using Crack Shape as Prior Information and Digital Image Correlation Method Open
A new crack identification method that estimates the cracks in invisible locations based on the surface deformation measured by digital image correlation (DIC) is developed. An inverse problem is setup to estimate such invisible cracks fro…
View article: Estimation for Time Enhancement Curves from intraoperative X-ray projection movies using singular value decomposition
Estimation for Time Enhancement Curves from intraoperative X-ray projection movies using singular value decomposition Open
It is a challenge in clinical practice to estimate Time Enhancement Curves (TEC) of a Region Of Interest ( ROI ) in real time from intraoperative X-ray projection movies. In the past, TEC was estimated by obtaining the Standard Linear Atte…
View article: Identification of Crack Shape by Digital Image Correlation Using JE-MAP Method.
Identification of Crack Shape by Digital Image Correlation Using JE-MAP Method. Open
We are developing a method that estimates cracks that are invisible from the surface based on the surface deformation measured by digital image correlation (DIC). An inverse problem is set up to estimate such invisible cracks from the surf…
View article: Novel regularization method for inverse problem of crack identification using cross-sparseness
Novel regularization method for inverse problem of crack identification using cross-sparseness Open
The effective regularization method for the inverse problem of identifying cracks inside a structure is developed. We consider the inverse problem whose measurement data is surface deformation. The Joint Estimation-Maximum a Posteriori (JE…
View article: Development of Cathodic Protection Monitoring Method Using Data Assimilation
Development of Cathodic Protection Monitoring Method Using Data Assimilation Open
We have developed inverse analysis method that simultaneously estimates the three-dimensional position of measuring instrument and output current from sacrificial anode. Inverse analysis is a method of estimating an unknown output current …
View article: Numerical Analysis of Pattern Shape Deformation in UV Imprint Due to Curing Shrinkage
Numerical Analysis of Pattern Shape Deformation in UV Imprint Due to Curing Shrinkage Open
The accuracy of a numerical modeling method for UV imprint processes to simulate the UV resin deformation due to UV shrinkage was evaluated. Typical UV resins induce volumetric shrinkage by several percent after UV curing. The curing shrin…
View article: Development of Electrochemical Flow Cell System Programmable to Set Sample Concentration
Development of Electrochemical Flow Cell System Programmable to Set Sample Concentration Open
A novel electrochemical flow cell system that can be programmed to set arbitrary conditions for flow velocity and concentration has been developed. The system includes an electrochemical flow cell and solution supply devices. The flow cell…
View article: Simultaneous Estimation of Position of Underwater Measuring Instrument and Output Current from Anode using Particle Filter
Simultaneous Estimation of Position of Underwater Measuring Instrument and Output Current from Anode using Particle Filter Open
Typical marine steel structures are cathodic protected by sacrificial anode method. Due to the nature of sacrificial anode, it is consumed with time and the generated current decreases. In order to properly maintain and manage the marine s…
View article: Identification of Concentration Dependent Characteristics of Electrochemical Reaction Using Inverse Analysis
Identification of Concentration Dependent Characteristics of Electrochemical Reaction Using Inverse Analysis Open
We developed a method to identify concentration-dependent characteristics of an electrochemical reaction. Concentration and reaction rate distributions on electrode surface cannot be measured directly and a sum of the reaction rate distrib…
View article: Development of force sensors for inverse problem of pressure distribution on disc brake
Development of force sensors for inverse problem of pressure distribution on disc brake Open
In this paper, we developed a new self-excited force sensor with a tunning-fork-beam for measurement of inverse problem. The proposed force sensor has the following characteristics: 1) high heat resistant 2) wireless measurement 3) potenti…
View article: Identification of Personal Characteristics and Linear Attenuation Coefficients Using Bayesian Hierarchical model for Spectral CT
Identification of Personal Characteristics and Linear Attenuation Coefficients Using Bayesian Hierarchical model for Spectral CT Open
We propose a new regularization method using spectral X - ray CT with patient - specific characteristic parameters. In this method, firstly, the characteristic parameter unique to the patient is identified by applying a hierarchical Bayesi…
View article: Numerical-analysis-assisted monitoring method for the coating condition on a ballast tank wall
Numerical-analysis-assisted monitoring method for the coating condition on a ballast tank wall Open
A numerical-analysis-assisted monitoring method was developed for the coating condition on a ballast tank wall.It was proposed that the coating condition is evaluated by the surface resistance.An identification method was developed to obta…
View article: Numerical Simulation of Carbon-Aluminium Galvanic Corrosion under a Saltwater Film
Numerical Simulation of Carbon-Aluminium Galvanic Corrosion under a Saltwater Film Open
塩水膜環境においてカーボンとアルミニウムの間で起こるガルバニック腐食を再現する数値解析手法を開発した．解析においては電場，イオンの電気泳動，物質拡散，化学反応および金属の形状変化を考慮し，電気的中性と質量保存を満足させた．物質移動解析において陰解法を用いて計算を高速化し，化学反応解析においてアルミニウムイオンの4種の加水分解反応を考慮した．また，実験との比較により，手法の再現精度を検証した．
View article: Stabilized formulation of F-bar aided edge-based smoothed finite element method with 4-node tetrahedral elements in explicit dynamics
Stabilized formulation of F-bar aided edge-based smoothed finite element method with 4-node tetrahedral elements in explicit dynamics Open
This paper proposes stailized formulation of F-bar aided edge-based smoothed finite element method with tetrahedral elements (F-barES-FEM-T4) for explicit dynamics, which is named SymF-barES-FEM-T4. SymF-barES-FEM-T4 can take over some adv…
View article: Estimation method of current density between laminated thin sheets by inverse analysis of magnetic field (Application to short circuit localization)
Estimation method of current density between laminated thin sheets by inverse analysis of magnetic field (Application to short circuit localization) Open
Analyses of magnetic field help find out internal states noninvasively and there are many applications of the analyses for nondestructive inspections. In the field of power sources, there has been a great discussion about behaviors of an i…
View article: Non-intrusive identification of anisotropic elastic constants of friction materials of disk brake pads using inverse analysis
Non-intrusive identification of anisotropic elastic constants of friction materials of disk brake pads using inverse analysis Open
A novel method to identify anisotropic elastic constants for friction materials of automotive disk brake pads is proposed. This method identifies accurate elastic constants of friction materials in a non-intrusive way using the inverse ana…