設計工学
Online ISSN : 2188-9023
Print ISSN : 0919-2948
ISSN-L : 0919-2948
早期公開論文
早期公開論文の7件中1~7を表示しています
  • 室巻 孝郎, 谷 仁裕, 南 裕樹
    論文ID: 2022.2952
    発行日: 2022年
    [早期公開] 公開日: 2022/09/15
    ジャーナル フリー 早期公開

    In this paper, we propose a three-dimensional movable lighting system consisting of multiple LED lighting units placed in a space. We aim to control the illuminance distribution in 3D space by appropriately determining the lighting arrangement and ON/OFF lighting pattern of the lighting system. In this paper, we first formulated the optimization problem of lighting arrangement and ON/OFF pattern. Then, we proposed an algorithm to solve the optimization problem, assuming that each LED lighting unit is placed in a box created by dividing the space into a grid. In order to solve the optimization problem, we introduce a virtual network model to communicate the excess and deficiency of illuminance. This approach can be applied to the constrained optimization problem with infeasible area in 3D space. The numerical calculation results are shown for a desired illuminance distribution with and without infeasible area on the lighting arrangement. Furthermore, we developed an experimental setup using 16 LED units. Finally, we verified the effectiveness of our algorithm by control experiments.

  • 三林 誠治, 堤 昴太, 小武内 清貴, 大窪 和也
    論文ID: 2022.2960
    発行日: 2022年
    [早期公開] 公開日: 2022/09/10
    ジャーナル フリー 早期公開

    The purpose of this study is to clarify skew driven by pulleys with in-plane angular misalignment. A thin flat test belt was driven under the condition of a constant speed with quasi free of torque between two pulleys. In-plane angular misalignment of driving or driven pulley was applied by rotating base plates of pulleys. The displacement in the width direction of belt was measured by laser displacement sensor. Approaching and departing angle during belt skew was measured by images analysis. Acceleration of belt in the width direction was also measured by an acceleration sensor attached on the flat belt. The result shows that the skew ratio defined as the ratio of the belt displacement in the width direction to the belt moving distance was linearly increased with increasing of angular misalignment of driving pulley or angular misalignment of driven pulley. The belt approaching direction of belt was relatively close to the direction of the axis which is normal to pulley compared to belt departing angle. It was found that, the direction of skew was inverted depending on the condition whether in-plane angular misalignment was applied to the driving pulley or driven pulley.

  • 柏原 侑輝, Mohd Danial IBRAHIM, 渡邉 仁, 砂見 雄太
    論文ID: 2022.2963
    発行日: 2022年
    [早期公開] 公開日: 2022/09/10
    ジャーナル フリー 早期公開

    In this paper, in order to clarify the effect of heat on die casting of Mg-Al-RE alloy, the relationship between the die temperature and internal porosities were investigated. Furthermore, the mechanical properties exerted by the solidification microstructure were also investigated. Moreover, two sleeves that are equipped with each system that keeps the molten metal heated were newly developed. The cast samples were investigated using an X-ray CT scan, tensile tests, Vickers hardness tests, and solidification microstructure observations. As the die temperature increased, it was confirmed that porosities generation were suppressed while the tensile strength increased. The tensile tests and the X-ray CT scans revealed that the porosity volume increased due to partial fractures caused by stress concentration around the porosities. The tensile strength increased when the mold temperature is higher due to the increase of transgranular fractures in comparison to the intergranular fractures. It was also clearly clarified that the newly developed resistive heating sleeve promotes the growing of chilled layers where it eventually increased the Vickers hardness of the casting surface. Hence, this paper experimentally verified that it is effective to control heat by introducing the novel heated sleeve systems in die casting.

  • (第2報,がたの領域に外接する円の半径の導出)
    鈴木 伸哉, 金田 徹
    論文ID: 2022.2958
    発行日: 2022年
    [早期公開] 公開日: 2022/09/06
    ジャーナル フリー 早期公開

    This paper discusses the assembly variation that can arise when the positioning between two parts is constrained using two holes that fit over two bosses. Two parts positioned using two holes fitting over two bosses may move relative to each other during assembly because of slight clearances between the boss-hole pairs. In many cases, two boss-hole clearances are toleranced equally, resulting a motion which is more complex than simple translation or rotation. In this paper, the region where a certain point can move due to rattling is called “rattling area”, and the formula for the diameter of the circle circumscribing the rattling area is derived. Furthermore, a drawing experiment was conducted to verify the calculation of the circumscribed circle.

  • 太田 利夫, 楊 剣鳴, 加藤 匡剛, 笠川 亮, 髙畑 健二
    論文ID: 2022.2950
    発行日: 2022年
    [早期公開] 公開日: 2022/06/24
    ジャーナル フリー 早期公開

    The social situation after the COVID-19 infection has entered an era where it is difficult to predict as VUCA , and technological innovations to solve environmental problems (carbon-free, global warming control, CO2 reduction and other environmental and energy problems, etc.), Front-loading, which assigns human resources into the upstream process, and large-scale usage of regenerative energy are required, and the control system design process also responded to these processes are becoming necessary. In the current situation where, open model data distribution to promote front loading is becoming popular, it is best to utilize the MBD(Model Based Design) method in order to cope with this situation. This time, we researched and developed using the MBD method in the development process of the control law to generate the Haptic steering feeling that simulates the steering feeling of the conventional vehicle in the SBW vehicle. The control law was implemented in a controller capable of RCP(Rapid Control Prototyping) to realize the MBD process. MBD utilization is effective because the development process utilizing MBD was able to achieve the prescribed research goals with a small number of people and in a short period of time. This is a proof that the use of MBD was effective. In this report, we report the novelty and the feasibility of the RI generation algorithm by applying the MBD, and a general-purpose model (guideline / model). Also, the result of sensory evaluation can be immediately reflected in the Haptic generation law.

  • 生田 智章, 高濱 良好, 西 遼佑, 小野 勇一, 小出 隆夫
    論文ID: 2022.2955
    発行日: 2022年
    [早期公開] 公開日: 2022/05/31
    ジャーナル フリー 早期公開

    As a candidate remedy for the case depth deviation in induction hardened gears, this study experimentally revealed the influence of re-induction hardening (RIH) on the bending fatigue strength of S45C spur gears. We used the original induction hardened gears with thinner, the target, and thicker case depths (called GI1, GI2, and GI3, respectively). We conducted RIH for GI1 without any intermediate heat treatment (IHT), and for GI3 without any IHT, or with various IHTs such as the vacuum normalizing, tempering, and induction heating and normalizing. Bending fatigue limit (BFL) of the re-induction hardened GI1 was greater than BFLs of the original GI1 and GI2. BFLs of the re-induction hardened GI3 with IHTs were roughly equal to or greater than BFLs of the original GI3 and GI2. In contrast, BFL of the re-induction hardened GI3 without any IHT was smaller than BFL of the original GI3. Our results indicate that RIH is applicable in terms of BFL of S45C spur gears, and performing IHT is highly recommended for too thick case depth.

  • 福地 亜宝郎
    論文ID: 2021.2948
    発行日: 2022年
    [早期公開] 公開日: 2022/05/27
    ジャーナル フリー 早期公開

    Hybrid rockets have the advantages of safety propulsion system and low cost fuel compared to liquid rockets and solid rockets, but improving the burning rate of fuels is a major issue, and various approaches have been taken for fuel properties and combustion methods. The author devised a liquid-encapsulated fuel as a measure to improve the burning rate of the hybrid rocket. The liquid-encapsulated fuel is containing the liquid fuel in the solid fuel. At the burning surface, liquid fuel is directly supplied to the combustion area and the surface without melting process or gasification process of usual hybrid rocket fuels. Also it is possible to control the burning rate by the shape, position, and number of containing the liquid. In order to demonstrate the production of the liquid-encapsulated fuel, the author prototyped a solid fuel containing liquid fuel with a size of 10 mm×10 mm×100 mm using a stereolithography 3D printer with a liquid resin. And the liquid-encapsulated fuels were prototyped, but the bubbles were generated inside the liquid. After investigating the cause, the author sought an appropriate curing process of 3D printer and shape design guidelines that suppress the generation of bubbles, and succeeded in prototyping a liquid-encapsulated fuel without bubbles.

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