著者

媚山 政良

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.53, no.495, pp.3358-3362, 1987-11-25

被引用文献数

12

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The author and his co-workers have been developing the technique of collecting, conserving and utilizing systems of cold heat energy in the winter season. This paper presents an example of methods for the storage of agricultural products by the use of natural ice in winter season ; that is, by means of a HIMURO type storage shed. The author has proposed a method for the thermal design of a cold storage room taking account of monthly changes in environmental conditions and heat generation from agricultural products. The experiment was performed over a period of one year to verify the propriety of the thermal design and to observe the storing condition of product by using a HIMURO type storage shed on a practical scale. The close agreement between the observed and designed characteristic values were obtained. It is clear that the characteristics of the HIMURO type storage shed are very suitable for storing many kinds of agricuitural products over a long time period.

著者

佐藤 正隆

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.47, no.420, pp.1604-1611, 1981-08-25

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エントロピに負号を付けるという, ネゲントロピの従来の定義は, 情報や秩序, 非平衡性, 仕事などを統一した概念としてとらえるには不十分であった. 本研究では従来の定義に変更を加えた新しい定義を提案し, 上記の諸概念をより適切に表現できる量を導いた. これによってネゲントロピと仕事との密接な関連が示され, この方向は有効なエネルギなどへもつながるが, 本報ではこのような展開のための基礎概念の定式化を行っている.

著者

佐藤 正隆

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.52, no.475, pp.1078-1085, 1986-03-25

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Kullback-Leibler の情報量による定義を導入することによって、一般的な状況へ拡張されたネゲントロピの式を、本報では二つの異なる視点から展望した。第1の展開式からは交差項が得られる。交差項は系に課せられた前提条件を動かすことによって取り出しうるネゲントロピを表す。第2の展開式からは相互ネゲントロピが導かれるが、これは系を部分的に分割したとき、部分系相互間の非平衝性を表すものである。

著者

佐藤 正隆

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.51, no.467, pp.2132-2139, 1985-07-25

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ネゲントロピを一般的な状況に適用できるように拡張する場合,エントロピ差でなくKullback-Leiblerの情報量によって定義すべきことを前報で述べた.本報ではこのネゲントロピと,置かれている状況下で系から取り出しうる最大仕事との関係を,例題について調べた.すなわちKullback-Leiblerの情報量によるネゲントロピと最大仕事とは,等温系においては比例し,等温系でない場合も両者の微少変化量をとれば比例する.

著者

斉藤 慎太郎 玉木 恕乎 吉本 康文

出版者

一般社団法人日本機械学会

雑誌

講演論文集

巻号頁・発行日

vol.2002, no.39, pp.361-362, 2002-03-08

著者

斎藤 孝基

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.95, no.889, 1992-12-05

著者

笛木 和雄 鯉沼 秀臣

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.86, no.778, pp.1089-1093, 1983-09-05

著者

沢田 照夫

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.78, no.684, pp.1052-1057, 1975-11

著者

尾関 高行 中垣 隆雄

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.76, no.763, pp.406-408, 2010-03-25

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Electrochemical partial oxidation (EPOx) of methane can convert exhaust heat into electricity as much as difference between change of Gibbs free energy and change of enthalpy. In this paper, we considered 30kW power generation system combined Micro Gas Turbine and the Partial Oxdation Solid Oxide Fuel Cell using Gadolinium Doped Ceria as the electrolyte that has high oxide ion conductivity below 600℃. The cylindrical-shaped POSOFC is operated at 572℃ recovering turbine exhaust heat of 593℃ and accompanying production of hydrogen and carbon monoxide. According to the result of process simulation coupling with SOFC simulation including detailed polarization models, only addition of 16 liter POSOFC can increases the power generation efficiency by 8.5 points at fuel utilization of 80.1%.

著者

神宮 利夫 永倉 和郎

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. A編 (ISSN:03875008)

巻号頁・発行日

vol.57, no.544, pp.3069-3076, 1991-12-25

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A robotic manipulator is simplified by numerous beams with pinjoints between them and an anchor pinjoint at the base. The beams under impact loading are allowed to rotate about the axis of the pinjoint. The dynamic response of a vertical chain for a transverse load suddenly applied along every beam is theoretically analysed. The angular and linear acceleration of the mass center of beams, reaction force at the pinjoints, shearing force and bending moment along the beams is presented as a function of impact load. As the vertical chain consisting of one plaster beam and one steel beam, or two with a pinjoint between them, is subjected to the collision of the flier steel rod accelerated by the air gun, the location of the fracture of the plaster beam is measured experimentally. The validation of the theory is confirmed by comparison of the location of the critical bending moment with the position of the fracture of the beam.

著者

趙 希禄 胡 亜波 萩原 一郎

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. A編 (ISSN:03875008)

巻号頁・発行日

vol.76, no.769, pp.1131-1138, 2010-09-25

参考文献数

8

被引用文献数

1

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As regard to car frontal crash, previous researches have indicated that the front side member plays a major role in energy absorption. For protecting the passengers, the front side member is expected to absorb crash energy as much as possible. In this study, we investigated the crash characteristics of half cut type side member structure by optimal design method to improve energy absorption ability. We developed an automatic optimal design system, in which the analysis meshes are generated with a group of design parameters and shape optimization is carried out automatically, The design variables are side member cross section shape, spot welding pitch length, divisional section numbers and radius difference along the axial direction, and the number of subdivision levels. As the result, the optimal side member structure with half cut type is capable of absorbing 1.44 times (1.29 times per unit mass) more energy than the original rectangular cross sectional side member structure with half cut type which is generally used.

著者

野島 武敏

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. C編 (ISSN:03875024)

巻号頁・発行日

vol.68, no.667, pp.1015-1020, 2002-03-25

参考文献数

6

被引用文献数

3

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The purpose of this paper is to present foldable tubes or conical shells with such non-circular cross-sections as rectangular ones. The developments of these structures consist of the combinations of two or more kinds of differently shaped structual elements, which form spiral configurations. Several kinds of such foldable tubes as well as conical shells are newly developed. Origami samples of foldable tubes and conical shells have been manufactured and their foldabilities have been checked. It has been assured that all samples are perfectly folded in axial direction.

著者

小澤 由行 増田 正夫 岡本 英之

出版者

一般社団法人日本機械学会

雑誌

動力・エネルギー技術の最前線講演論文集 : シンポジウム

巻号頁・発行日

vol.2002, no.8, pp.393-398, 2002-06-14

被引用文献数

3

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Technologies for the load-leveling of electricity do not directly contribute to the reduction of CO_2 emission which is now the critical political issue in development in the energy field. Though lowering of the load factor is inevitable from a natural feature and a socio-economic activity of Japan, it is a great social loss, considering the operation time of the large-scaled centralized power stations. In this development, we aim at the preparing the technical alternative for the load-leveling and pioneering the new field for hydrogen energy uses in the near future. Here we describe the test fabrication of an reversible cell with enlarged-electrode area to prospect to the technical feasibility of kW-class cell stack and the system integration among a water electrolysis, a hydrogen storage and a fuel cell to optimize both functions of co-generation and energy storage.

著者

菅野 雅信 赤石 誉幸 山崎 由大 金子 成彦

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.76, no.763, pp.403-405, 2010-03-25

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To realize stable operation of microgrids, gas engines require to compensate load changes from demands and variation of other renewable energy devices. Then, prehension of load following capability is important in gas engines. In addition, when biomass gas is supplied to gas engines, effect of fuel component variation on dynamic characteristics must be investigated, because components of biomass gas depend on operating condition of gasification or raw material. This study proposed a dynamic simulation model of gas engine and estimated transient response to load changes. Load changes were sinusoidal wave, and bias value, amplitude and frequency of them were varied. As a result, the frequency has more influence on transient response than the bias value and the amplitude. When biomass gas is supplied to gas engines, transient response is worce than city gas over the frequency of 0.1Hz.

著者

坂東 茂 幸田 栄一 笹嶋 賢一 柳井 崇 木下 守弘 沼田 茂生 緒方 隆雄 徳本 勉 浅野 浩志

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.76, no.763, pp.409-411, 2010-03-25

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We developed the scheme of profitability analysis of a microgrid. The scheme consists of 4 processes. The first process is to calculate the optimal sizing of energy supply system in a microgrid by solving mixed integer non-linear programming by using the General Algebraic Modeling System (GAMS). The second one is to determine the distribution of system equipment by taking space in each area into account. The third one is to design electric equipment, such as transmission. The forth one is evaluation of pay-back time, reduction rate of primary energy consumption and that of carbon dioxide emission. By using this scheme we also evaluate pay-back time about construction of a microgrid in Tokyo.

著者

氏家 長明

出版者

一般社団法人日本機械学会

雑誌

機械學會誌

巻号頁・発行日

vol.37, no.202, 1934-02

著者

近藤 豊 石原 幸吉 横田 眞一 大坪 泰文 枝村 一弥

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集 : JSME annual meeting

巻号頁・発行日

vol.2000, no.1, pp.227-228, 2000-07-31

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Recently Otsubo and Edamura reported that dielectric fluids showed striking viscosity increase on the application of electric field when the electrode surface was planted with hair-like short fibers. By using the phenomenon, ER effect applications are expected without ER fluids. This study aims to develop a fluid control valve with the ER effect caused by fiber planted electrodes. In this paper, firstly, the fiber planted ER valve, which have fiber planted high voltage electrode and normal surface ground electrode, is proposed. The valve can control fluid power with applied voltage. Secondly, as an application of a fiber planted ER valve, a 4-port fiber planted ER valve is proposed and fabricated. And then, it is demonstrated that a 4-port fiber planted ER valve can control a piston-cylinder.

著者

西沢 祐介 田中 寛人 吉田 勝俊 佐藤 啓仁

出版者

一般社団法人日本機械学会

雑誌

Dynamics & Design Conference

巻号頁・発行日

vol.2006, pp."108-1"-"108-5", 2006-08-06

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非線形振動系とその複製に共通の不規則外乱を与えると,両者の応答が同期する現象が知られている.任意の初期値から同期状態へ到達するまでの収束時間は,パラメータ条件の選び方に大きく依存するが,未検討である.そこで本報では,このような収束時間のパラメータ依存性を,統計的等価線形化法によって定量評価してみる.具体例として,ランダム調和入力を受ける系(式(Al))と,狭帯域ランダム入力を受ける系(式(A2))を取り上げる.x+cx+kG(x_0+x;μ)=Q+P_<cos>(ωt)+sw(t) (A1) {x+cx+kG(X_0+x;μ)=Q+F(t) F+2ζω_nF+ω^2_nF=sw(t) (A2) G(x_0+x;μ)={x_0+x+μ (x_0+x&le;-μ) 0 (-μ<x_0+x<μ) x_0+x-μ (x_0+x&ge;μ)以下の数値例では,式(A1)に対してc=0.04, k=1,0, Q=0.3, P=0.2,μ=0.7, s=0.02とする.図A1は,式(A1)から求めた同期誤差の見本過程の一例を表わす.ω=1.07に対する図A1の(a)の結果では同期までの収束時間はT=195程度だが,ω=0.81に対する図A1の(b)では, T=18973程度を要する.このように,同期に至る収束時間にはパラメータ依存性がある.同期可能なパラメータを推定する常套手段として,式(A1)の系の最大リアプノフ指数を入力周波数ωの関数としてプロットしたのが図A2である.先ほどの条件ω=1.07,0.81に対する最大リアプノフ指数はそれぞれλ&ap;-0.102,-0.101となり,収束時間の変化は捉えられない.そこで,積率微分方程式を用いて式(A1)の分散応答を求めた結果を図A3の上段に示す.ω=0.77,0.92を跳躍点とする跳躍履歴現象が見られる.図A1の収束時間と比較すると,収束時間が短い条件ω=1.07は跳躍履歴現象の外部に位置し,収束時間が長い条件ω=0.81では内部に位置している.すなわち,積率微分方程式の跳躍履歴現象の有無によって,同期への収束時間を評価できる可能性が明らかになった.この仮説を確かめるため,図A3の下段に,サンプルiの初期値x_kに対する収束時間をT_i(x_k)とするときの平均収束時間〈T>= 1/(MN)Σ^M_<i=1>Σ^N_<k=1> T_i(x_k)を示す..M=100, N=5×5とした.収束時間が長い条件ω=0.81は,積率微分方程式の跳躍履歴現象の発生領域に含まれており,式(A1)の積率微分方程式の跳躍履歴現象は,同期の収束性が悪化するための十分条件を与えている.なお,式(A2)の場合には逆に必要条件を与える.

著者

長井 浩 安藤 生大

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.76, no.763, pp.377-379, 2010-03-25

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Wind turbines generate sustainable energy, however CO_2 is emitted during the various processes in the life cycle of a wind turbine. Therefore, it is important to take into account the latest data of the environmental impact in addition to applying megawatt scale wind turbines by the method of LCA. In this study, recent CO_2 basic unit (g-CO_2/kWh) was calculated under the conditions of that the life time of turbines is set to be 20 years and the life cycle includes manufacturing, construction, transportation and operation processes. The recalculation result of the domestic 2MW wind turbine constructed in Choshi area shows 10.8g-CO_2/kWh and 13.5g-CO_2/kWh under the conditions of average wind speed=6m/s, CO_2 emission rate of operation and maintenance=1.0%/year, the loss of transmission grid etc=5% in its life cycle. The important points of electricity produced by wind turbines are finding locations with good wind supply and application of large scale wind turbines. And the "product category rule" should be established for the standardized calculation of the Japanese CO_2 basic unit (g-CO_2/kWh) of the wind generator.

著者

山崎 哲 高本 正樹 細井 賢三 山崎 均 新井 悟司 清水 和義

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.66, no.642, pp.619-626, 2000-02-25

参考文献数

12

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The partial flow dilution method is one of the typical measurement methods for particulate matter emission from diesel engines. In this method, exhaust gas at a transient flow rate should be transferred to a dilution tunnel at a constant ratio of exhaust gas. The present partial flow dilution method is used under steady-state engine operating conditions in lieu of direct flow rate measurement of exhaust gas. A more practical control of exhaust emission is, however, required world widely; therefore development of an exhaust gas flowmeter is indispensable in the partial flow dilution method for transient engine operating conditions. An ultrasonic exhaust gas flowmeter has been developed and been demonstrated to be capable of measuring the exhaust gas flow rate with sufficient accuracy.