Current Affiliation Organization 【 display / non-display 】

Current Affiliation Organization 【 display / non-display 】

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Research Theme 【 display / non-display 】

• Study on Impingement Heat Transfer

• Study on heat resistance properties of ablation materials

Thesis 【 display / non-display 】

Thesis 【 display / non-display 】

• 衝突噴流の時・空間温度および流動場の可視化による熱伝達特性に関する実験的研究

  2000.03

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Quasi-Steady Non-Charring Ablation in a Semi-Infinite Solid withTemperature-Dependent Thermal Properties by Modified Perturbation Method

  Sumio KATO , Shoichi MATSUDA

  TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACESCIENCES, AEROSPACE TECHNOLOGY JAPAN ( TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACESCIENCES, AEROSPACE TECHNOLOGY JAPAN )  23   1 - 8   2025.03 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Study on Penetration Increase Mechanism of TIG Welding Using External Magnetic Field

  MATSUDA Shoichi, TANAHARA Yasushi, KOMEN Hisaya, KOBAYASH Yuki, TANAKA Manabu

  Journal of Smart Processing ( Smart Processing Society for Materials, Environment & Energy (High Temperature Society of Japan) )  13 ( 5 ) 261 - 269   2024.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

   To improve the penetration depth and welding efficiency of TIG welding, we have proposed the “Electromagnetic Controlled Molten Pool Welding Process" (hereinafter referred to as ECMP method). Until now, by utilizing the electromagnetic force generated when adding an external magnetic field to the current flowing in the arc and the molten pool, it has become possible to increase the penetration depth, albeit under very limited conditions. However, the penetration depth varies greatly depending on the distribution of the external magnetic field and the position of the magnetic poles, and the slight differences in these conditions could result in a shallower penetration depth. In this study, in order to elucidate this mechanism, we observed in detail the effects of the external magnetic fields on the arc, the surface flows of molten pool, and the bead shape. In addition, since it is clear that the flow within the molten pool has a large effect on the penetration depth, we directly observed the flow within the molten pool by the X-ray transmission observation. As a result, when a negative magnetic field was applied that inclined the arc backwards (at which time electromagnetic force was generated in the arc in the opposite direction to the welding direction), the penetration of TIG welding increased and this mechanism was clarified from the observation results of the flows within the molten pool.

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• Mist cooling lithium-ion battery thermal management system for hybrid electric vehicles

  Teranishi, A; Kurogi, T; Senaha, I; Matsuda, S; Yasuda, K

  APPLIED ENERGY ( Applied Energy )  364   123214 - 123214   2024.06 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• A radiating straight fin with constant thermal properties by modified perturbation method

  Kato, S; Matsuda, S

  MECHANICAL ENGINEERING JOURNAL ( 一般社団法人 日本機械学会 )  10 ( 6 ) 23-00111 - 23-00111   2023.10

  Type of publication: Research paper (scientific journal)

  　View Summary

  <p>A modified perturbation method (Kato and Matsuda, 2021) is used to obtain the solution of the heat transfer problem of a radiating straight fin with constant thermal properties. The main procedure of the modified perturbation method (MPM) is: (1) A perturbation parameter <i>ε</i> is assumed to be included in the nonlinear term of the differential equation. The solution <i>θ</i> is expressed by <i>θ</i> = <i>φ</i> + <i>θ</i>_f, where <i>θ</i>_f is an initial approximation of the solution. (In this paper, <i>θ</i>_f is assumed to be a constant) (2) <i>θ</i> = <i>φ</i> + <i>θ</i>_f is substituted into the differential equation and the nonlinear term is split into linear and nonlinear terms. (3) <i>ε</i> which is not in the nonlinear term is replaced by a newly introduced parameter <i>ε</i>´. (4) An asymptotic expansion of <i>φ</i> in powers of <i>ε</i> is assumed for the solution of the differential equation, from which we obtain the perturbation solution of <i>φ</i> including <i>ε</i> and <i>ε</i>´. (5) <i>ε</i>´ in the perturbation solution of <i>φ</i> is replaced by <i>ε</i>. Then we obtain the perturbation solution of <i>θ</i>. The obtained solutions by MPM are found to be in good agreement with the numerical results by the finite difference method. The solutions are also compared with those by the conventional perturbation method (CPM). It is found that MPM can extend the applicable range of the small parameter <i>ε</i> (radiation-conduction parameter) drastically compared with that by CPM. The modifications of the perturbation method by splitting the nonlinear term help reduce the contribution of the nonlinear term, which drastically improve the convergence characteristics of the solution.</p>

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• Analytical solution for the problem of one-dimensional quasi-steady non-charring ablation in a semi-infinite solid with temperature-dependent thermo-physical properties

  Kato S., Matsuda, S.

  Thermal Science and Engineering Progress ( Thermal Science and Engineering Progress )  31   101181 - 101181   2022.06 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  Exact quasi-steady solution of temperature distribution for one-dimensional non-charring ablation in a semi-infinite material with temperature-dependent thermo-physical properties is obtained analytically, in which the surface temperature and the surface recession velocity are assumed to be constant. The analytical solutions for the cases in which thermo-physical properties are expressed by low degree polynomial functions of temperature are also obtained. Two kinds of non-charring ablation models are considered. One is a single phase model composed of a single phase (the crystalline phase), in which the surface recedes due to ablation. The other is a two-phase model composed of two phases (the crystalline and the amorphous phases) such as Teflon, in which the surface of the amorphous region recedes. The calculated results of the analytical solution agreed well with those of the numerical solution by the finite difference method. The basic behavior of Teflon ablation is calculated by using the analytical solution. The simple and exact analytical solution obtained in this paper is easy to calculate and is helpful in understanding the ablation behavior easily. It allows for rapid estimation of the ablation behavior for engineering purposes. The solution also provides a means to verify computer solutions obtained by numerical methods.

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Other Papers 【 display / non-display 】

• Characteristic of condensation heat transfer of plate condenser using aluminum alloy plates

  Hirofumi ARIMA, Yuta SHIGENAGA, Shoichi MATSUDA

    24   19 - 28   2019

   

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• 海洋深層水のカスケード利用に関する研究

  仲里 大河，松田 昇一，有馬 博史

  日本機械学会 九州支部 九州学生会第56回学生員卒業研究発表講演会  (独立行政法人国立高等専門学校機構　大分工業高等専門学校)  2025.03  -  2025.03 

• Effect of external magnetic field on molten metal flow of TIG welding

  MATSUDA Shoichi, TANAHARA Yasushi, KOMEN Hisaya, TANAKA Manabu

  2024.09  -  2024.09 

• Simulation of TIG welding phenomena with external magnetic field

  Y. Kobayashi, H. Komen, S. Matsuda, M. Tanaka

  Japan Welding Society National Conference  2023.09  -  2023.09 

• Effect of external magnetic field on penetration of TIG welding

  MATSUDA Shoichi, TANAHARA Yasushi, KOMEN Hisaya, KOBAYASHI Yuki, TANAKA Manabu

  2023.09  -  2023.09 

• Effect of external magnetic field on penetration of TIG welding

  MATSUDA Shoichi, TANAHARA Yasushi, KOMEN Hisaya, KOBAYASHI Yuki, TANAKA Manabu

  Preprints of the National Meeting of JWS  2023  -  2023 

  CiNii Research

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Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2019.04  -  2022.03 

  Direct: 3,300,000 (YEN)  Overheads: 990,000 (YEN)  Total: 4,290,000 (YEN)

• Study on high quality and high efficiency GMA welding utilizing external magnetic field

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2019.04  -  2022.03 

  Direct: 3,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 990,000 (YEN)

• Study on high quality and high efficiency GMA welding utilizing external magnetic field

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2019.04  -  2022.03 

  Direct: 3,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 990,000 (YEN)

• Study on high quality and high efficiency GMA welding utilizing external magnetic field

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2019.04  -  2022.03 

  Investigator(s): Matsuda Shoichi 

  Direct: 3,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 990,000 (YEN)

  　View Summary

  Gas metal arc (GMA) welding is a highly efficient welding method, but since the welding wire also serves as an electrode (heat source), the heat source fluctuates temporally and spatially, so the arc is unstable. Therefore, it has the disadvantage that welding defects such as humping beads are likely to occur. In this study, we tried to reduce welding defects by stabilizing the arc and molten metal flow by using the electromagnetic force generated in the arc and the molten pool by adding an external magnetic field. Even when a DC magnetic field was applied to GMA welding, the arc fluctuated back and forth in the welding direction, but extreme arc deflection and welding defects were suppressed. Furthermore, when a high-frequency AC magnetic field was applied to GMA welding, the fluctuation of arc and molten pool was further suppressed, and although the range of application was still narrow, welding with few welding defects has become possible while maintaining a high welding efficiency.

• Study on high quality and high efficiency GMA welding utilizing external magnetic field

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2019.04  -  2022.03 

  Investigator(s): Matsuda Shoichi 

  Direct: 3,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 990,000 (YEN)

  　View Summary

  Gas metal arc (GMA) welding is a highly efficient welding method, but since the welding wire also serves as an electrode (heat source), the heat source fluctuates temporally and spatially, so the arc is unstable. Therefore, it has the disadvantage that welding defects such as humping beads are likely to occur. In this study, we tried to reduce welding defects by stabilizing the arc and molten metal flow by using the electromagnetic force generated in the arc and the molten pool by adding an external magnetic field. Even when a DC magnetic field was applied to GMA welding, the arc fluctuated back and forth in the welding direction, but extreme arc deflection and welding defects were suppressed. Furthermore, when a high-frequency AC magnetic field was applied to GMA welding, the fluctuation of arc and molten pool was further suppressed, and although the range of application was still narrow, welding with few welding defects has become possible while maintaining a high welding efficiency.

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