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OA-A2: Room 1 / Micro Electro-Mechanical Systems & Maintenance and Reliability Engineering & Micromagnetism, Hysteresis
Time:
Monday, 13/Nov/2023:
3:20pm - 4:40pm
Session Chair: Dr. Hiroaki Kikuchi Session Chair: Dr. Oleksii Karpenko
Presentations
3:20pm - 3:40pm ID: 410 / OA-A2: 1 Regular_Abstract (short paper) Submission Topics: Micro Electro-Mechanical Systems (MEMS) Keywords: Microvalve, Hydrogel actuator, Magnetic nanoparticle, Thermoresponsive hydrogel, Magnetic heating
MAGNETIC-NANOPARTICLE-EMBEDDED HYDROGEL MICROVALVE REMOTELY ACTIVATED BY ALTERNATING MAGNETIC FIELDS
Chiemi OKA, Daiki MIWA, Koichi TANIHIRA, Junpei SAKURAI, Seiichi HATA
Nagoya University, Japan
The present paper demonstrates the manufacturing of a “wireless” microvalve composed of magnetic-nanoparticle-embedded thermoresponsive hydrogels via a photolithography process. The microvalve was remotely actuated using the alternating-magnetic-field application. The field application caused the microgel to shrink and thus “microvalve-open.” The microvalve completely closed when the field was turned off. In addition, we confirmed the valve opening/closing behavior was consistent with magnetic-field switching. Although the spontaneous repetition of shrinking and swelling of microvalves was observed when the magnetic field application was kept, the repetition could be reduced by increasing the strength of the magnetic field.
1Graduate School of Engineering, Tohoku University, Japan; 2Institute of Fluid Science, Tohoku University, Japan; 3Tohoku Electric Power Co., Inc., Japan
This study proposes a numerical model to predict pipe failure based on periodic non-destructive inspections using electromagnetic acoustic resonance (EMAR). A total of 176 artificially corroded samples were measured using EMAR to quantify the uncertainty in pipe wall thickness evaluation. Pipe failure probability in the future was evaluated based on the results of EMAR measurements with the aid of the Bayes theorem. Whereas this study considered only pipe rupture, the results of numerical simulations supported the validity of the model.
4:00pm - 4:20pm ID: 416 / OA-A2: 3 Regular_Abstract (short paper) Submission Topics: Maintenance and Reliability Engineering (MRE) Keywords: power system design
SOME UNACHIEVED ISSUES FOR POWER SYSTEM DESIGN IN THE CONTEXT OF MIGRATION TOWARDS ELECTRICITY
Vincent Georges MAZAURIC
Schneider Electric, France
The evolution of the power system is reviewed in the context of massive penetration of variable renewable energy sources. Some issues seem underexplored to enforce the stability, the adequacy and the decarbonation of the power system in a context of migration towards electricity.
In this paper we use a micromagnetic model to preview the switching behavior of very small ferromagnetic elements deposited on a nonmagnetic substrate. These elements present a rectangular shape and very small dimensions. A regular pattern of the magnetization inside each element is expected. The micromagnetic model is based on the calculation of the energies involved for a given applied external magnetic field. To obtain the different components of the energy each element was divided into smaller finite cubes. The magnetization is assumed as a uniform-magnitude vector inside each element, with equal magnitude, but different direction.
