最近の研究テーマ (Current Research Topics)

• 次世代製造システムに関する知的システム (Developing Intelligent Systems for Industry 4.0)

• 精密加工面のモデリングならびにシミュレーションシステム (Modeling and Simulation of Precision Machining and Grinding)

• ビッグデータ分析 (Big Data Analytics)

• 3Dプリンターを用いた複雑な形状の実現 (Complex Shape Realization using 3D Printing)

• 持続可能性を規範とする製品開発 (Sustainable Product Development)

研究詳細 (Research Details)

(1) センサー信号を規範とするデジタルツイン作成

Developing Sensor Signal-Based Digital Twins

Three types of digital twins (Object, Process, and Phenomenon twins) are needed for virtualizing a real-life manufacturing process and functionalizing high-level cognitive tasks (monitoring, understanding, predicting, decision-making, and adapting). In this study, we are developing phenomena twins using historic phenomena-relevant sensor signal datasets. For this, two Java-based systems: Digital Twin Construction System (DTCS) and Digital Twin Adaptation System (DTAS), are developed for constructing and adapting the twins, respectfully. The DTCS acquires semantically annotated phenomena-relevant sensor signal datasets from cloud, machine learns the knowledge underlying the datasets, simulates the relevant phenomenon using a stochastic simulation process, and validates the simulation outcomes using possibility distributions (fuzzy numbers). The DTAS adapts the validated outcomes for real-time monitoring (one example shown in the video below).

For more, see our work here or contact us at: ullah@mail.kitami-it.ac.jp.

#Industry4.0 #SmartManufacturing #DigitalTwins #MachineLearning #Modeling #Simulation

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(2) 人口ニューラルネットおよびDNA-based Computingを用いた工具摩耗管理システムの構築

Managing Tool Wear Using Artificial Neural Network (ANN) & DNA-Based Computing (DBC)

Managing tool-wear is an important issue associated with all material removal processes. This study deals with the application of two nature-inspired computing techniques, namely, artificial neural network (ANN) and (in silico) DNA-based computing (DBC) for managing the tool-wear. Experimental data (images of worn-zone of cutting tool) has been used to train the ANN and, then, to perform the DBC. It is demonstrated that the ANN can predict the degree of tool-wear from a set of tool-wear images processed under a given procedure whereas the DBC can identify the degree of similarity/dissimilar among the processed images.

For more, see our work here or contact us at: ullah@mail.kitami-it.ac.jp.

#ToolWear #NatureInspiredComputing #Biologicalization #ANN #DBC #Prediction #PatternRecognition

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(3) 「DNA-Based Computing (DBC)」を用いた画像処理とその砥石作業面トポグラフィー解析への応用

Intelligent Image Processing Using DNA-Based Computing (DBC)

The material removal ability of a grinding wheel depends on whether the wheel surface is populated with a sufficiently high number of randomly distributed active abrasive grains. This condition is ensured by performing dressing operations at regular time intervals. The effectiveness of a dressing operation is determined by measuring the surface topography of the wheel. In many cases, image processing methods are employed to determine the surface topography. However, such procedures must be able to remove the regions where the abrasive grains do not reside while keeping, at the same time, the regions where the abrasive grains reside. Thus, special kinds of image processing techniques are needed to distinguish the non-grain regions from the grain regions, which requires a heavy computing load and long duration. As an alternative, in the framework of the “Biologicalization in Manufacturing” paradigm, this study employs a bio-inspiration-based computing method known as DNA-based computing (DBC). The outcomes of this study can help develop an intelligent image processing system to optimize dressing operations and thereby, grinding operations.

For more, see our work here or contact us at: ullah@mail.kitami-it.ac.jp.

#ImageProcessing #BioInspiredManufacturing #SurfaceTopography #Grinding #DNABasedComputing(DBC)

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(4) 持続可能なリバースエンジニアリングプロセスに関する研究

On A Sustainable Reverse Engineering Process

Reverse engineering mimics critical features of an existing object to create its accurate or enhanced virtual/physical models. It is thus useful in creating the digital footprints of an object. It requires sophisticated devices, computing facilities, and high human skills. Thus, a reverse engineering process becomes sustainable if it is less dependent on sophisticated devices, computations, and human skills. From this point of view, this study presents a sustainable reverse engineering process consisting of five steps. The process is compared with the traditional scanned point cloud-based reverse engineering. The comparison shows that it is free from computational complexity, creates comparatively accurate models, and works very fast. Integrating the presented reverse engineering process with a product life cycle engineering can contribute to sustainable product development.

For more, see our work here or contact us at: ullah@mail.kitami-it.ac.jp.

#ReverseEngineering #Sustainability #ProductDevelopment #ProductLifeCycle #HumanCognition #GeometricModeling

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(5) 解析による点群発生とその幾何学的モデリングへの応用

Developing A Recursive Point Cloud Creation Algorithm & Its Application To Geometric Modeling

Digital manufacturing technology can be used to preserve craftsmanship (e.g., Ainu pattern-making craftsmanship). From this perspective, this study presents a methodology to create both virtual and physical prototypes of Ainu patterns using digital manufacturing technology. In particular, a point cloud-based approach was adopted to model the patterns. The virtual and physical prototypes of both basic (Hokkaido) Ainu motifs and some synthesized patterns were reproduced using the presented methodology. The point cloud creation algorithm is also effective for geometric modeling and 3D printing of 3D shapes. The findings of this study will help those who want to digitize the craftsmanship of culturally significant artifacts without using a 3D scanner or image processing.

For more, see our works [1], [2], or contact us at: ullah@mail.kitami-it.ac.jp.

#ReverseEngineering #PointCloud #3DPrinting #DigitalCraftsmanship #DesignForAdditiveManufacturing #GeometricModeling

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(6) より自然的な多孔質構造の設計及び製造に関するシステム開発

Developing A System For Designing & Fabricating More Natural Porous Structures

Porous structures exhibit superior properties compared to their non-porous counterparts, though they are challenging to design and fabricate. This study presents a self-contained and user-friendly system that designs a porous structure by filling the spaces between a randomly generated point cloud and a closed boundary. It produces the STL dataset of the designed structure. The system generated STL datasets were used to fabricate some porous structures using a 3D printer. The fabricated structures exhibits randomly sized and distributed pores through which gasses and liquids could pass. These characteristics of the fabricated structures make them suitable for engineering and biomedical applications.

For more, see our works here or contact us at: ullah@mail.kitami-it.ac.jp.

#AdditiveManufacturing #GeometricModeling #ComputerAidedDesign

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(7) 令和4年度 精密工学会 北海道支部 学術講演会

2022 JSPE Hokkaido Branch Academic Lecture

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(8) 令和4年度卒研中間発表会

2022 Interim Presentation Session