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A Review of Adhesion and Friction Models for Gecko Feet
곽재섭,김태완 한국정밀공학회 2010 International Journal of Precision Engineering and Vol.11 No.1
The attachment pads of geckos exhibit the most versatile and effective adhesive known in nature. Their fibrillar structure is the primary source of high adhesion and their hierarchical structure produces the adhesion enhancement by giving the gecko the adaptability to create a large real area of contact with surfaces. Although geckos are capable of producing large adhesive forces, they retain the ability to remove their feet from an attachment surface at will. Detachment is achieved by a peeling motion of the gecko’s feet from a surface. During the last few years, many researches have been conducted to develop the theoretical models that explain the gecko to adhere and detach from surfaces at will, including micro/macroscopic gecko adhesion, friction and peeling models for gecko hierarchical fibrillar structure contacting to rough surface. This review describes the progress in the modeling filed for gecko adhesion, friction and peeling, and discussed the future issues for gecko modeling.
Detection Technique of Fault Phenomena Using Power Parameters in Grinding Process
곽재섭,하만경 한국정밀공학회 2002 International Journal of Precision Engineering and Vol.3 No.1
The grinding process has been mainly used for finishing metal products as final machining stage. But chatter vibration and burn of a workpiece have a bad effect on the machined surface and should be detected in modern grinding process. This paper deals with a fault detection of the cylindrical plunge grinding process by power parameters. During the grinding process the power signals of an induced motor were sampled and used to determine the relationship between fault and change of power parameters. A neural network was used for detecting the grinding fault and an influence of power parameters to the grinding fault was analyzed.