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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 】

• 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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• A modified perturbation method in which the applicable range of a small parameter for the solution is extended much larger than that by the conventional perturbation method

  KATO Sumio, MATSUDA Shoichi

  Mechanical Engineering Journal ( 一般社団法人 日本機械学会 )  8 ( 6 ) 21-00153 - 21-00153   2021.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  <p>A modified perturbation method, in which the applicable range of a small parameter <i>ε</i> for the solution is extended larger than that by the conventional perturbation method, is applied to two simple heat transfer problems with temperature-dependent thermal properties. The main procedure of the modified perturbation method 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 and <i>φ</i> is <i>θ</i> − <i>θ</i>_f. (In the example problems of this paper, we assume that <i>θ</i>_f is 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 variable <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>. By solving the two example problems, it is made clear that the solution by the modified perturbation method is more accurate than that by the conventional perturbation method. It is also made clear that the modified perturbation method extends drastically the applicable range of the perturbation parameter in comparison with the conventional perturbation method. The modifications of the perturbation method help reduce the contribution of the nonlinear term, which drastically improves the convergence characteristics of the solution. The reason for the good convergence characteristics of the modified perturbation solution is discussed.</p>

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• Study on penetration control of the arc welding using external magnetic field– Influence of external magnetic field on arc shape and heat input–　

  Shoichi MATSUDA Manabu TANAKA and Yasushi TANAHARA

  Proceedings of the Visual-JW 2019 and WSE 2019 ( Joining and Welding Research Institute Osaka University )    2019.11 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

• Study on penetration control of the arc welding using external magnetic field– Influence of external magnetic field on arc shape and heat input–

  Shoichi MATSUDA, Manabu TANAKA, Yasushi TANAHARA

  Proceedings of the Visual-JW 2019 and WSE 2019     2019.11 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

• One-dimensional Ablation Analysis of Lightweight CFRP Ablators with Coking

  KATO Sumio, MATSUDA Shoichi, SHIMADA Naoyuki, SAKAI Shunsuke, OKUYAMA Keiichi, SZASZ Bianca, SHIMODA Takayuki

  TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN ( 日本航空宇宙学会 )  17 ( 4 ) 461 - 470   2019.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  <p>The coking phenomenon within a lightweight carbon-phenolic ablator exposed to the heating environment of air is investigated. The existing one-dimensional charring ablation analysis code is modified so that the coking behavior of the ablator can be calculated as well as the thermal response behavior within a lightweight carbon-phenolic ablator. The mass conservation equations for a pyrolysis gas and carbon in the gas are given. The energy equation including the coking process is also presented. The measured density distributions of some arc-heated CFRP ablator samples are compared with those calculated by the ablation analysis code, from which good agreement is obtained. The density profiles with and without coking are compared. The effect of temperature dependency of carbon mass fraction in a pyrolysis gas in the coking equation upon the density profile is examined. The effect of heating rate upon the density distribution in an ablator is also examined. The effect of coking upon the surface recession is studied analytically and experimentally.</p>

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Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Influence of high frequency alternative magnetic field on arc shape and bead shape of GMA welding

  Shoichi Matsuda, Yasushi Tanahara, Manabu Tanaka, kazuto Ninomiya

  2022.09  -  2022.09 

• Control of molten metal flow for helium gas tungsten arc welding by an external magnetic field

  S. Matsuda, Y. Tanahara, M. Tanaka

  2021.11  -  2021.11 

• Control of molten metal flow for helium gas tungsten arc welding by an external magnetic field

  S. Matsuda, Y. Tanahara, M. Tanaka

  2021.11  -  2021.11 

• Study on high quality and high efficiency GMA welding using external magnetic field Influence of alternative magnetic field on arc shape and bead shape

  MATSUDA Shoichi, TANAHARA Yasushi and TANAKA Manabu

  Japan Welding Society, Autumn Meeting  (on line)  2021.09  -  2021.09 

• Study on high quality and high efficiency GMA welding using external magnetic field Influence of alternative magnetic field on arc shape and bead shape

  MATSUDA Shoichi, TANAHARA Yasushi, TANAKA Manabu

  2021.09  -  2021.09 

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

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)

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

  Project Year: 2016.04  -  2019.03 

  Direct: 3,700,000 (YEN)  Overheads: 1,110,000 (YEN)  Total: 4,810,000 (YEN)

• Study on penetration control of the arc welding using external magnetic field

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2016.04  -  2019.03 

  Investigator(s): MATSUDA Shoichi 

  Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

  　View Summary

  TIG welding is one of the welding methods widely used in industries for high reliability of joints, little occurrence of spattering and high convenience of construction. However, compared with other arc welding methods, there is a disadvantage that depth of penetration is sallow. To solve this problem, we proposed a new ECMP (Electromagnetic Controlled Molten Pool Welding Process) method which controls the molten metal flow by using electromagnetic forces generated in the molten pool by applying a magnetic field. In this study, we investigated in detail the influence of the electromagnetic forces generated by the external magnetic field on the arc, the flow of the molten pool and surface temperature of molten pool. From these results, the influence of the external magnetic field on the arc shape and the heat input to the base material was clarified. It was also found that the downward and upward electromagnetic forces in the molten pool contribute to penetration increase.

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SDGs 【 display / non-display 】

SDGs 【 display / non-display 】