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THE FATIGUE EVALUATION METHOD FOR A STRUCTURAL STAINLESS STEEL USING THE MAGNETIC SENSOR COMPOSED OF THREE PANCAKE COILS

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AIP Conference Proceedings 2011年第1期1335卷 1225-1232页

作者： M. Oka Y. Tsuchida T. Yakushiji M. Enokizono aDepartment of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870‐0152 Japan bDepartment of Electrical and Electronic Engineering Faculty of Engineering Oita University 700 Dannoharu Oita 870‐1192 Japan cDepartment of Mechanical Engineering Oita National College of Technology 1666 Maki Oita 870‐0152 Japan

May metallic structural materials, such as stainless steels, are currently used in our surroundings. If external force is repeatedly added for many years, it is thought that fatigue damage accumulates in stainless steels. When excessive fatigue damage accumulates in these metals, there is a possibility that they are destroyed by fatigue damage accumulation. Therefore, it is important to know the amount of the fatigue damage they have suffered in order to prevent them from being destroyed. We are developing the fatigue evaluation method for stainless steels with a magnetic sensor composed of three pancake type coils. In this research, the inspection object is ferritic stainless steels such as SUS430. The method of fatigue evaluation for ferritic stainless steels uses the three coil type sensor, and shows a good correlation between the number of stress cycles and the output signal of the sensor, even though the correlation between the output signal and an added stress is not completely accurate. This paper describes the evaluation method of fatigue damage in ferritic stainless steel using a magnetic sensor composed of three pancake‐type coils.

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Robust sliding mode control applied to double Inverted pendulum system

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AIP Conference Proceedings 2009年第1期1107卷 222-228页

作者： Sonia Mahjoub Faiçal Mnif Nabil Derbel aResearch unit on Intelligent Control design & Optimization of complex Systems (ICOS) National engineering school of sfax BP W 3038 Sfax bDepartment of Electrical and Computer Engineering Sultan Qaboos University Muscat Oman

A three hierarchical sliding mode control is presented for a class of an underactuated system which can overcome the mismatched perturbations. The considered underactuated system is a double inverted pendulum (DIP), can be modeled by three subsystems. Such structure allows the construction of several designs of hierarchies for the controller. For all hierarchical designs, the asymptotic stability of every layer sliding mode surface and the sliding mode surface of subsystems are proved theoretically by Barbalat’s lemma. Simulation results show the validity of these methods.

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Development of Web‐Based Menu Planning Support System and its Solution Using Genetic Algorithm

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AIP Conference Proceedings 2009年第1期1174卷 56-68页

作者： Tomoko Kashima Shimpei Matsumoto Hiroaki Ishii aGraduate School of Information Science and Technology Osaka University 1‐5 Yamadaoka Suita Osaka 565‐0871 Japan bDepartment of Computer and Control Engineering Oita National College of Technology 1666 Oaza‐Maki Oita 870‐0152 Japan

Recently lifestyle‐related diseases have become an object of public concern, while at the same time people are being more health conscious. As an essential factor for causing the lifestyle‐related diseases, we assume that the knowledge circulation on dietary habits is still insufficient. This paper focuses on everyday meals close to our life and proposes a well‐balanced menu planning system as a preventive measure of lifestyle‐related diseases. The system is developed by using a Web‐based frontend and it provides multi‐user services and menu information sharing capabilities like social networking services (SNS). The system is implemented on a Web server running Apache (HTTP server software), MySQL (database management system), and PHP (scripting language for dynamic Web pages). For the menu planning, a genetic algorithm is applied by understanding this problem as multidimensional 0–1 integer programming.

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NON‐DESTRUCTIVE EVALUATION OF FATIGUE DAMAGE FOR SUS316 BY USING ELECTROMAGNETIC METHODS

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AIP Conference Proceedings 2009年第1期1096卷 1442-1449页

There are some fatigue damage estimation methods for an austenitic stainless steel that uses martensitic transformation. For instance, those are the remanent magnetization method, the excitation method using the differential pick‐up coil, and so on. We are researching also those two methods in our laboratory now. In the remanent magnetization method, it is well known that the relationship between fatigue damage and the remanent magnetization is simple, clear, and reproducible. In addition, the excitation method can be easily used at the job site because the special magnetizer is unnecessary. But, these methods have some disadvantages shown as follows. For instance, the former needs a special magnetizer and the latter’s output signal is small. On the other hand, it is well known that the inductance of a pancake type coil put on the metallic specimen changes according to the electromagnetic properties of the metallic specimen. In this paper, the assessment method of fatigue of an austenitic stainless steel (SUS316) that uses the change by fatigue of the inductance of the pancake type coil measured with the LCR meter is shown. In addition, the fatigue evaluation performance of this method is described.

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ESTIMATION OF FATIGUE DAMAGE FOR AN AUSTENITIC STAINLESS STEEL (SUS304) USING A PANCAKE TYPE COIL

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AIP Conference Proceedings 2008年第1期975卷 1244-1251页

作者： M. Oka Y. Tsuchida S. Nagato T. Yakushiji M. Enokizono aDepartment of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870‐0152 Japan bDepartment of Electrical and Electronic Engineering Faculty of Engineering Oita University 700 Dannoharu Oita 870‐1192 Japan cDepartment of Mechanical Engineering Oita National College of Technology 1666 Maki Oita 870‐0152 Japan

There are some fatigue damage estimation methods of an austenitic stainless steel that uses martensitic transformation. For instance, those are the remanent magnetization method, the excitation method, and so on. Those two methods are researched also in our laboratory now. In the remanent magnetization method, it is well known that the relationship between fatigue damage and the remanent magnetization is simple, clear, and reproducible. However, this method has the disadvantage to need a special magnetizer. Then, this method cannot be easily used at the job site such as the factory. On the other hand, as the special magnetizer is unnecessary, the excitation method can be easily used at the job site. But, this method has some disadvantages shown as follows. For instance, the output signal of this method is small. And the surface state of the specimen strongly influences the noise component of the output signal. It is well known that the inductance of a pancake type coil put on the metallic specimen changes according to the electromagnetic properties of the metallic specimen. In this paper, the method of evaluation of fatigue damage of an austenitic stainless steel (SUS304) by using a change of an inductance of a pancake type coil is shown. In addition, the fatigue evaluation performance of this method is described.

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