Explanipedia

Fluid-particle-structure interaction in single shot peening Open

Yusuke Mizuno, Takashi Misaka, Yoshiyuki Furukawa · 2024

An experimental study of multi-sensor tool wear monitoring and its application to predictive maintenance Open

German Herrera-Granados, Takashi Misaka, Jonny Herwan, Hitoshi Komoto, Yoshiyuki Furukawa · 2024

Wear in cutting tools is a critical issue that can lead to reduced product quality, increased production costs, and unexpected downtime. To mitigate these challenges, the implementation of tool wear monitoring systems and predictive mainte…

Inverse problem prediction of non-Newtonian properties based on dam break experiments Open

Masahiro Kondo, Takashi Misaka, Sui Satomi, Shunichi Suzuki, Kimitaka Watanabe , et al. · 2023

A non-Newtonian dam break experiment is inversely simulated with the moving particle hydrodynamics (MPH) method by adapting physical parameters via the Bayesian optimization. Because of the physical consistency, which is asserted when the …

Estimation of spray flow characteristics using ensemble Kalman filter Open

Shun Takahashi, Takashi Misaka, Shotaro Nara, Naoki Sugiyama, Tetsuo Nohara , et al. · 2022

Spray flows are widely used in several industrial applications, such as combustion engines. Accurate measurement of spray flow characteristics requires sophisticated equipment and techniques. In recent years, the discrete droplet method (D…

Augmentation of Cross-Sectional Spray Measurements with Discrete Droplet Model Using Ensemble Kalman Filter Open

Shun Takahashi, Takashi Misaka, Shotaro Nara, Naoki Sugiyama, Tetsuo Nohara , et al. · 2022

Spray flows containing droplets and particles are used in various industrial fields. In this study, we investigate an efficient and reliable way to predict the spray flow of droplets by combining the discrete droplet model (DDM) with ensem…

Estimation of Spray Flow Characteristics Using Ensemble Kalman Filter Open

Shun Takahashi, Takashi Misaka, Shotaro Nara, Naoki Sugiyama, Tetsuo Nohara , et al. · 2022

Thermal state estimation based on Assisted Ensemble Kalman Filter Open

Hiroto Tanaka, Takashi Misaka, Koji Fujita, Hiroki Nagai · 2021

Thermal analysis of spacecraft is one of the most important processes to ensure the safety of spacecraft systems. However, the thermal mathematical model has uncertainty such as thermal contact conductance or thermal optical properties. Th…

Cyber-Physical Synchronization via Data Assimilation Open

Takashi Misaka · 2021

CPS(Cyber-Physical Systems)には対象によって多様な実現形が存在すると考えられるが,サイバーとしてCAE(Computer-Aided Engineering)シミュレーション,フィジカルとして対応する計測データを考えた場合,それらの融合はそれぞれの不確かさを考慮するため確率的に(すなわちベイズ的に)行うのがよさそうである.数値シミュレーションと計測データを使ってベイズ推定を実現するデータ同化は,シミュレーションモデルの不確かな要因(初期・境界条件,…

Turning Process Monitoring with Deep Neural Network Trained by FEM Simulation Open

Takashi Misaka, Jonny Herwan, Ichiro Ogura, Yoshiyuki Furukawa · 2021

Metal cutting is a complex process in machining where a direct measurement at the contact point between a cutting tool and workpiece is not straight forward. However, a numerical approach, such as the metal cutting finite element method (F…

Shape optimization for suppressing coherent structure of two-dimensional open cavity flow Open

Takashi Nakazawa, Takashi Misaka, Clair Poignard · 2020

This paper presents an optimal design obtained as a shape optimization problem in a domain with a singular point. For shape optimization, the eigenvalue in Snapshot Proper Orthogonal Decomposition (Snapshot POD) is defined as a cost functi…

Real-time estimation of airflow vector based on lidar observations for preview control Open

Ryota Kikuchi, Takashi Misaka, Shigeru Obayashi, Hamaki Inokuchi · 2020

As part of control techniques, gust-alleviation systems using airborne Doppler lidar technology are expected to enhance aviation safety by significantly reducing the risk of turbulence-related accidents. Accurate measurement and estimation…

Sonic-boom Evaluation in Realistic Atmospheres: Introduction of the SEIRA Project Open

Hiroshi Yamashita, Bastian Kern, Shigeru Obayashi, Takashi Misaka, Takahiro Ukai · 2020

The project SEIRA (Sonic-boom Evaluation In Realistic Atmospheres) has been kicked-off in June 2020. We simulate a lot of supersonic flights in the chemistry-climate model EMAC and obtain realistic atmospheric conditions corresponding to t…

Streamline pair selection for comparative flow field visualization Open

Shoko Sawada, Takayuki Itoh, Takashi Misaka, Shigeru Obayashi, Tobias Czauderna , et al. · 2020

Application of Ensemble Kalman Filter to Pedestrian Flow Open

Fumiya Togashi, Takashi Misaka, Rainald Löhner, Shigeru Obayashi · 2020

We adopted the Ensemble Kalman Filter (EnKF) methodology in our computational simulation code for pedestrian flows. The EnKF, which is a type of data assimilation methodology, has been developed in the field of weather forecast where the a…

Real-Time Estimation of Airflow Vector based on Lidar Observations for Preview Control Open

Ryota Kikuchi, Takashi Misaka, Shigeru Obayashi, Hamaki Inokuchi · 2020

The control technique in a gust alleviation system by using the airborne Doppler Lidar technology is expected to enhance aviation safety to minimize the risks of turbulence-related accidents. Accurate measurement and estimation of the vert…

Study on decay characteristics of vertical four-vortex system for increasing airport capacity Open

Junho Cho, Bok Jik Lee, Takashi Misaka, Kwanjung Yee · 2020

The wake vortices of an aircraft descend by self-induction that enables a pilot to identify approximate wake location based on the preceding aircraft path. A pilot taking off an aircraft can avoid a wake vortex encounter by performing earl…

Predicting Surface Roughness of Dry Cut Grey Cast Iron Based on Cutting Parameters and Vibration Signals from Different Sensor Positions in CNC Turning Open

Jonny Herwan, Seisuke Kano, Oleg Ryabov, Hiroyuki Sawada, Nagayoshi Kasashima , et al. · 2020

During the turning process, cast iron is directly shattered to become particles. This mechanism means the surface roughness cannot be predicted using the kinematic equation. This paper provides surface roughness predictions using two metho…

Bounding box coordinates of von Karman vortex street Open

Takashi Misaka · 2020

Those files contain bounding box coordinates of von Karman vortex street annotated by VoTT. The von Karman vortex street is annotated as one object in vortex_street.tar.gz, while each vortex in the von Karman vortex street is annotated as …

Bounding box coordinates of von Karman vortex street Open

Takashi Misaka · 2020

Those files contain bounding box coordinates of von Karman vortex street annotated by VoTT. The von Karman vortex street is annotated as one object in vortex_street.tar.gz, while each vortex in the von Karman vortex street is annotated as …

Application of observability Gramian to targeted observation in WRF data assimilation Open

R. Yoshimura, Aiko Yakeno, Takashi Misaka, Shigeru Obayashi · 2019

The optimal observation placement in weather forecast and research (WRF) data assimilation is investigated using a sensitivity analysis method. The method quantifies the sensitivity of observation location to assimilated results as an unob…

後方乱気流のダイナミクス: 発生・崩壊と大気乱流の影響 Open

孝志三坂, 茂大林, フランクホルツァプフェル, Takashi Misaka, Shigeru Obayashi , et al. · 2019

A flying aircraft generates a coherent vortex pair due to its lift and a turbulent flow including the vortex pair is called wake turbulence. A following aircraft is affected by wake turbulence of a leading aircraft; therefore, wake turbule…

Aerodynamic prediction of 30P30N airfoil using 2D BCM Open

Takaya Kojima, Takashi Misaka, Aiko Yakeno, Shigeru Obayashi, Yusuke Shikada , et al. · 2019

Optimization of passive grooved micromixers based on genetic algorithm and graph theory Open

Mitsuo Yoshimura, Koji Shimoyama, Takashi Misaka, Shigeru Obayashi · 2019

This paper proposes a novel approach for fluid topology optimization using genetic algorithm. In this study, the enhancement of mixing in the passive micromixers is considered. The efficient mixing is achieved by the grooves attached on th…

FOM/ROM Hybrid Computation using Building Cube Method Open

Takashi Misaka · 2019

In this study, we consider a simple flow field around a circular cylinder discretized by multi-block Cartesian meshes. Block-wise switching of full-order model (FOM) and proper orthogonal decomposition (POD)-based reduced-order model (ROM)…

Toward Data Assimilation in Mechanical Cutting Process Open

Takashi Misaka, Jonny Herwan, Oleg Ryabov, Seisuke Kano, Hiroyuki Sawada , et al. · 2019

To realize a digital twin of production process, we are developing a data assimilation system of metal cutting based on finite element analysis (FEA) and measurement data. As a preliminary study of the data assimilation system, we conducte…

Zonal Reduced-Order Modelling Toward Prediction of Transitional Flow Fields Open

Takashi Misaka, Shigeru Obayashi · 2018

The utilization of measurement data is becoming attractive in various fields due to the massive growth of sensing and networking technologies. It is expected to utilize such a data-rich environment to improve engineering simulations in com…

Effect of Camber on Badminton Shuttlecock Open

Y. Konishi, Yusuke Matsushima, Takashi Misaka, Hiroyuki Okuizumi, Kensuke TANAKA , et al. · 2018

In this study, we conducted experimental measurements and computational analysis to investigate the aerodynamics of a shuttlecock, especially the effects of the camber of the shuttle’s skirt. The static aerodynamic coefficient from the exp…

Numerical Analysis of Two-Dimensional Turbine Blade Cascade by Cartesian Mesh CFD Open

Yuki Imura, Daisuke SASAKI, Takaya Kojima, Takashi Misaka, Shigeru Obayashi · 2018

Sensitivity Analysis of Observation Points in Local Weather Data Assimilation Open

R. Yoshimura, Takashi Misaka, Aiko Yakeno, Shigeru Obayashi, Masamichi Nakamura · 2018

We investigated the impact of observation position for data assimilation using sensitivity analysis. The impact of observation position was evaluated by an observability index proposed by Kang et al. (2009). We conducted an identical twin …

Aerodynamics Analysis of NASA Common Research Model Using BCM-TAS Coupling Flow Solver Open

Shinya MAKINO, Takashi Misaka, Shigeru Obayashi, Takuya HIROSE, Daisuke SASAKI · 2018

In this study, the aerodynamic performance of NASA Common Research Model (wing-body configuration) was analyzed by coupling a Cartesian mesh CFD solver of Building-Cube Method (BCM) and an unstructured mesh CFD solver of Tohoku University …

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