著者
星 光 曽我部 均
雑誌
全国大会講演論文集
巻号頁・発行日
vol.47, pp.399-400, 1993-09-27

冷暖房需要は、部屋の熱収支や設定温度など熱的な要因、空調機器の運用方法や人間の暑さに対する感覚などの人的要因、さらには天候などにより左右される複雑な現象である。このため、需要を予測する場合には適当な予測モデルを設計することが多い。この予測モデルに回帰モデルを利用する場合、一つの予測モデルで対応するには限界がある。たとえば冷房需要において、冬場の低需要期から夏の高需要期に移る時期では空調機器の運用方法や人の暑さに対する感覚が変化する。このため、気温に対する回帰係数は少なくとも低需要期用と高需要期用の二つを用意しなければならない。ところが、予測モデルを複数用意した場合にはモデルを切り替える条件が問題となる。このモデル切り換えの判断は試行錯誤的な要素が強く、あまり研究されていない。そこで本研究では、需要予測を回帰式で行う場合を前提とし、予測モデルを切り換える条件を求める方法について検討したので報告する。
著者
菊地 千之 臼井 英治 星 光一
出版者
公益社団法人 精密工学会
雑誌
精密機械 (ISSN:03743543)
巻号頁・発行日
vol.30, no.351, pp.316-324, 1964

Based upon the slip line theory applied to machining with cut-away tools proposed in the previous papers, the cutting force equilibrium through the plastic field is analyzed.<BR>Cutting forces and chip formation in machining with various types of cut-away tool are compared with the conventional tool. Tools having restricted double rake face are discussed in view of cutting forces, chip formation and slip line construction of the plastic field produced.
著者
星 光一 臼井 英治
出版者
公益社団法人 精密工学会
雑誌
精密機械 (ISSN:03743543)
巻号頁・発行日
vol.34, no.397, pp.113-120, 1968
被引用文献数
1

Wear characteristics and tool-life curves in machining of low and medium carbon steels with various types of cut-away tools made of carbide and high speed steel are described and compared with those for conventional tools.<BR>Although an artificial reduction of natural tool-chip contact length usually reduces both crater and flank wear, there always exists optimum value of contact length below which tool-life is shortened. The optimum length depends on side rake angle of the tool and is found that the smaller the rake angle, the shorter the length becomes.<BR>In comparison of tool wear at the optimum contact length, it is found that flank wear is somewhat increased, but crater is substantially reduced as the rake angle is decreased.<BR>Tools with sufficiently reduced contact length show a special type of crater which is not formed on the first rake face, but mainly develops along the second rake face. This characteristic is well explained by the theory of cutting mechanism presented in the previous papers.<BR>Not only cutting temperature but also shape of cutting edge has a great importance on tool wear even in high speed machining. The wear mechanism appears to be explained as a stressdependent rate process.
著者
三宮 泰治 星 光一
出版者
一般社団法人日本機械学会
雑誌
日本機械学會論文集 (ISSN:00290270)
巻号頁・発行日
vol.5, no.18, pp.216-221, 1939

従耒の調帯掛け普通平削盤とワードレオナルド方式高速平削盤との比較切削試験を試み、理論的立場といふよりは寧ろ現場的立場に重点を置き、工場に於て実際に使用し得るに便利な簡易なる切削力測定器を作り、それに依て両者の特異性を明らかにせんとしたものである。この目的のために普通平削盤にはシンシナチ製 20ft ベルト掛け平削盤、高速平削盤にはニイガタ 5D型標準高速平削盤を使用し、同一なる材質、形状及び大きさを有する被切削材を、各機に適應した実用的の切削条件の下に於て比較切削試験を行つたものである。
著者
岸浪 建史 秋山 俊彦 星 光一
出版者
公益社団法人 精密工学会
雑誌
精密機械 (ISSN:03743543)
巻号頁・発行日
vol.37, no.441, pp.701-707, 1971
被引用文献数
1

This paper describes the effects of the artificially controlled shear angle on the metal cutting process. From the experiments in which commercially pure lead is cut with various controlled shear angles, constant cutting speed, and depth, and various rake angles, the following results were obtained.<BR>(1) Taking rake angle (&alpha;) as parameter and increasing the controlled shear angle (&phi;), the points (&phi;, &beta;-&alpha;) move along a right convex curve on the &phi; vs &beta;-&alpha; plane on which critical points giving a minimum value of cutting force (<I>F<SUB>c</SUB></I>, min), lie in the vicinity of Merchant's Line.<BR>(2) The variation of &phi; does not influence the friction force on the rake face (CF), and the angle which gives a minimum cutting force (<I>F<SUB>c</SUB></I> min) gives a maximum value of coefficient of friction on the rake face.<BR>(3) Hydrostatic pressure on the shear plane increases with the increase of &phi;, and does not influence the shear stress on it.<BR>(4) It has been confirmed either the shear plane model does not agree with the cutting mechanics for low cutting speed or the angle &phi; is such that the total cutting power is not minimum.
著者
嘉数 侑昇 沖野 教郎 星 光一
出版者
公益社団法人 精密工学会
雑誌
精密機械 (ISSN:03743543)
巻号頁・発行日
vol.38, no.448, pp.436-442, 1972

Due to the increasing popularity of Numerical Controlled Machine Tool Systems, the development of the higher level soft wares in this field becomes necessary. Further more, direct connection between Computer-Aided Design (CAD) and Computer-Aided Manufacturing brings about a problem.<BR>In order to cope with these situations, this paper proposes a new method on the automatic programming for NC considering the connection of both systems.<BR>After description of the workpiece profile by &ldquo;Formulated Pattern&rdquo; in the process of CAD, this method makes it possible to generate automatically NC commands for the tool path.<BR>The basic idea of this method is to establish the penalty surface arround the workpiece profile as a guide for determining the tool path.<BR>Since, using &ldquo;Formulated Pattern&rdquo;, the penalty can be given such as having minimum value on the cutting point, the problem for finding tool path is reduced to that for seeking minimum on the penalty surface.<BR>In this paper a theoretical development of this principle and practical algorithm for the determination of tool path are described with two examples, NC milling of NASA Airfoil pat-tern and plate cam designed by CAD procedure. Then, a method for collision check using same principle is described too.
著者
臼井 英治 星 光一
出版者
公益社団法人 精密工学会
雑誌
精密機械 (ISSN:03743543)
巻号頁・発行日
vol.30, no.350, pp.273-284, 1964
被引用文献数
4

In the previous papers, it was reported that the plastic flow ahead of the restricted tool-chip contact length of cut-away tools is produced through a slip-line field which involves a centered fan.<BR>The plastic flow peculiar to the tools bears a great resemblance to the curved layer structure of built-up edge and the plastic flow within the chip ahead of the built-up edge nose, which are usually observed on etched specimen under microscope. In addition, the plastic flow itself turns to the stable built-up edge under some conditions.<BR>This paper stresses the importance of the plastic flow due to the centered fan of slip lines for more rational understandings of the nature of built-up edge. In this connection, the formation and the growth of the natural built-up edge as well as the built-up edge produced by cut-away tools are critically re-examined.
著者
青木 俊明 星 光平 佐藤 崇
出版者
Japan Society of Civil Engineers
雑誌
土木学会論文集D (ISSN:18806058)
巻号頁・発行日
vol.62, no.1, pp.43-53, 2006

本研究では集団状況における協力意向の形成機構を検討した.私的利益,手続き的公正,同調圧力を操作した心理実験の結果,以下の知見および示唆を得た.1)集団状況では,私的利益感,同調圧力感が重要な態度形成要因であること.2)同調圧力を作用させた実験参加者の約1割が公的受容を伴う同調で態度を形成していた.3)私的受容による同調と合わせると,4割強の実験参加者が同調圧力の影響を受けて態度を形成していた.4)私的受容と公的受容の分岐要因は,同調圧力感,私的利益感,手続き的公正感と推察される.5)同調を示す場合,私的利益感と手続き的公正感が低く,同調圧力感が高い場合には公的受容が促され,私的利益感と手続き的公正感が高く,同調圧力感がさほど高くない場合には私的受容が促されることが示唆された.
著者
星 光行 門田 浩
出版者
公益社団法人 日本工学教育協会
雑誌
工学教育 (ISSN:13412167)
巻号頁・発行日
vol.60, no.3, pp.3_92-3_98, 2012 (Released:2012-06-04)
参考文献数
5
被引用文献数
1

ET Robcon (ET software design robot contest) is a contest which aims the education of embedded software engineer. Participants compete modeling and implement technology in the development of the robot control software. The robot should run autonomously, and both the software design and the driving performance of the control are evaluated. In this paper, the contest overview and examination methodology are described. Then the results of the participants′ survey are discussed. As a result, we confirmed the improvement of modeling technology of the participants and the effect as a PBL (Project Based Learning) .