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OB-A2: Room 1 / Electromagnetic Smart Fluids, Electromagnetic Processing of Materials & Electromagnetic Functional Materials and Adaptive Systems & Robotics in Applied Electromagnetics and Mechanics
Time:
Tuesday, 14/Nov/2023:
2:40pm - 4:00pm
Session Chair: Prof. Yuji Tsuchida Session Chair: Prof. Artur Lopes Ribeiro
Michigan State University, United States of America
Metal additive manufacturing (AM) methods are increasingly being employed due to their ability to create complex parts that are sometimes very difficult to manufacture using conventional methods and often with fewer flaws. Typically, metal additive manufacturing involves fusing layers of powder using an energy source, such as a laser to first melt the metal powder to form a melt pool. The dynamics of melt-pool influences the microstructure and resultant properties of the AM parts. If the process is not controlled precisely, flaws result due to what is known as keyholing. This paper investigates the feasibility of minimizing the possibility of keyholing by actively controlling the dynamics of melt-pool by employing rotating magnetic fields to churn the melt pool. Simulation results showing our ability to churn the melt-pool will be presented.
1Nagoya Institute of Technology, Japan; 2Norwegian University of Science and Technology; 3Ferrotec Material Technologies Corporation
Magnetic fluids are nanofluids in which 10 nm-sized magnetic particles are stably dispersed in a carrier liquid such as water. The magnetic fluids are expected as phase change material to develop the thermal storage system. In the present study, we clarified the thermophysical properties of magnetic fluids during the melting and solidification process using differential scanning calorimetry (DSC). As a result, it was found that the magnetic fluid has a lower melting point than purified water and that the heat flow changes differently.
MEASUREMENT OF INDUCTANCE DISTRIBUTION IN NON-ORIENTED ELECTRICAL STEEL SHEET BY HIGH-FREQUENCY INDUCTION HEATING TREATMENT WITH MAGNETIC FLUX CONCENTRATION PLATE
Yuichiro KAI, Satoshi NAKAHARA
Kagoshima University, Japan
In this paper, a magnetic flux concentrator plate is used to heat a non-oriented electrical steel sheet, and the inductances before and after the heat treatment were compared and investigated. It was clear that the temperature at the center of the sample increased the most when using the magnetic flux concentrator plate. It was clarified that the inductance distributions differed upon heating with the magnetic flux concentrator plate.
1Shenyang University of Technology, China, People's Republic of; 2Kochi University of Technology, Kochi, Japan
This paper presents a new type of cable-driven variable stiffness robot elbow joint based on permanent magnet spring, pulley block and planetary gear train structure, which increases the range of motion and variable stiffness range of elbow joint. It expounds the principle and overall structural design of elbow joint, and gives the changing law of joint stiffness. The position control characteristics and stiffness controllability of this new type of variable stiffness elbow joint are verified by the decoupling verification experiment of stiffness and position of variable stiffness joint.
