著者

多田隈 建二郎

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.112, no.1086, 2009-05-05

著者

福島 E.文彦 中本 秀一 駄本 理一郎 広瀬 茂男

出版者

一般社団法人日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集

巻号頁・発行日

vol.2001, 2001-06-08

著者

舘 〓

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.109, no.1051, pp.452-453, 2006-06-05

著者

川崎 信史 細貝 広視 古橋 一郎 笠原 直人

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.2006, no.1, pp.959-960, 2006-09-15

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Thermal transient stress at core support structure of advanced fast reactor was evaluated using thermal hydraulic-structure total analysis method with experimental design. Maximum thermal stress is calculated 15〜18% larger than nominal thermal stress by uncertainty of system parameters. Maximum thermal stress was evaluated 63〜68% larger than nominal thermal stress when predicted by the past deign method, therefore about 40% excessive imaginary stress could be appropriate by thermal hydraulic-structure total analysis.

著者

橘田 征吾 長谷川 裕晃

出版者

一般社団法人日本機械学会

雑誌

日本機械学会東北支部秋季講演会講演論文集

巻号頁・発行日

vol.2010, no.46, pp.51-52, 2010-09-24

著者

荒木 幹也 嶋津 有宏 小保方 富夫 石間 経章 志賀 聖一 増渕 匡彦 杉本 知士郎

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.73, no.726, pp.622-630, 2007-02-25

被引用文献数

9

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Atomization characteristics of an ultrasonic fuel injector using a micro nozzle array were investigated experimentally. Micro nozzles whose exit diameter is d=3, 6 and 9μm are mounted on a thin metal film. The number of the micro nozzle is 2.0×10^4. Using an ultrasonic oscillator, gasoline is periodically pushed out from the micro nozzles at the frequency of 63.6 kHz. A disk-type PZT is used as an ultrasonic oscillator, and the oscillation is amplified using a step-type horn. The input voltage is varied from 0 to 200 V. At the natural frequency, the oscillation amplitude of the horn is about 10μm. The droplet diameter and velocity are measured with a phase Doppler analyzer at 15 mm downstream from the micro nozzle array. For d =3μm, the Sauter mean diameter (SMD) is about 10μm, and the fuel flow rate is 0.023 cc/s. The SMD is much smaller when compared to conventional port fuel injectors. For d=6μm, the SMD is about 10 to 18μm, and the fuel flow rate is 0.055 cc/s. For d=9μm, the SMD is about 16 to 28μm, and the fuel flow rate is 0.41 cc/s. It is shown that, using the micro nozzle array, a uniform-diameter steady spray can be obtained without high-pressure fuel pump and nozzle type injectors.

著者

徳安 達士 大庭 恵一 松本 慎平 平木場 浩二

出版者

一般社団法人日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集

巻号頁・発行日

vol.2010, pp."1P1-C01(1)"-"1P1-C01(2)", 2010

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Road racer that is used for bicycle competition on road has been getting more popular all over the world year after year. This type of bicycle has to be set the position for rider's physical properties in order to make it possible to ride powerfully and conformably. There are lots of degrees of freedoms for setting the bicycle position. Though each of them have effects for rider's performance, the setting of a seat height significantly affects user's performance during competition and/or training. Before now, any effective setting method for bicycle seat height associated with rider's physical properties had not been reported. Then we aims to propose a new setting method for bicycle position based on rider's physical properties. We focused on the lower electromyography during cycling exercise in order to define a new evaluate standard for bicycle position. This study had constructed an automatic seat height control system and defined a new evaluation standard for bicycle position in our previous work. In this paper, we introduce a control method by using Fuzzy inference and discuss about the experimental results.

著者

白幡 淳 砂田 博幸 三宅 仁

出版者

一般社団法人日本機械学会

雑誌

バイオエンジニアリング講演会講演論文集

巻号頁・発行日

vol.2005, no.18, pp.297-298, 2006-01-12

著者

佐藤 一志 粟山 仁 橋田 俊之 高橋 秀明

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.56, no.526, pp.1400-1405, 1990-06-25

被引用文献数

2 2

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The J-integral-based technique for measuring strain-softening curves is applied to determine the fracture toughness of granite. The measuring method has been recently proposed by Li for concrete. This method provides information on the fracture process zone formation and can be used for fracture toughness determination in strain-softening materials. CT specimens of three different sizes, 1.5inch, 2.5inch and 6inch CT were tested to examine the specimen size effect of measured strain-softening curves. Strain-softening curves measured on 2.5inch CT specimens are shown to be in good agreement with that determined from 6 inch CT specimens, indicating the possibility of determining the valid fracture toughness value by means of the J-integral-based technique. The test results for 1.5inch CT specimens, however, yield a lower fracture toughness value than that obtained on the other specimen sizes, suggesting the need of detailed investigations on specimen size requirements for the reliable use of subsized specimens. Finally, the strain-softening curves obtained by the J-based technique are compared with existing data determined by uniaxial tensile tests on several types of granite.

著者

新井 崇洋 阿部 豊 佐藤 健一郎 中川 裕二

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.2004, no.3, pp.221-222, 2004-09-04

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Spontaneous vapor explosion can occur when a layer of the high temperature molten material lies on the water pool or on the moisture floor. This is so-called base-triggered vapor explosion. The base-triggered vapor explosion is supposed to occur in the case of a severe accident in a nuclear reactor and in other industrial facilities. It is very important to clarify the base-triggered vapor explosion from the viewpoints of the prediction and the prevention of the vapor explosion. In order to evaluate the heat transfer and fluid dynamic behavior of the base-triggered vapor explosion, the experimental apparatus is designed and constructed. The experiments using U-Alloy95 as a stimulant material are conducted. Consequently, the behavior of the molten material can be observed in detail with this experimental apparatus. The digital auto-correlation method and PIV are also applied to the visual observation data obtained on the experiments in order to evaluate the velocity distribution of the molten material. Based on the velocity, the conversion ratio of kinetic energy in initial thermal energy at the vapor explosion is also evaluated. In addition, the experimental results are compared with the thermal interaction zone (TIZ) theory in order to evaluate the occurrence condition of base-triggered vapor explosion.

著者

西嶋 修 福原 直道 平方 寛之 米津 明生 箕島 弘二

出版者

一般社団法人日本機械学会

雑誌

M&M材料力学カンファレンス

巻号頁・発行日

vol.2010, pp.10-11, 2010-10-09

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This study aims to elucidate the mechanics of crack propagation in a freestanding Cu thin film deposited by electron beam evaporation We developed the method for fabricating nano or submicron meter-thick freestanding metallic films with width and length of the miffimeter order. Focused ion beam (FIB) was employed to introduce a pre-crack in an about 500 nm-thick Cu film. It is found that the crack stably propagated by uniaxial tensile loading, and then the crack propagation rate rapidly increased, resulting in unstable fracture. The fracture surface suggested that the local area near the crack tip undergoes large plastic deformation, resulting in crack propagation in ductile manner. In parallel, the elastic-plastic stress distribution around the crack tip was analyzed by finite element method (FEM). The mechanics of crack propagation and fracture toughness were investigated on the basis of the R-curve concept.

著者

石川 拓司 大島 修造 山根 隆一郎

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.63, no.607, pp.789-797, 1997-03-25

被引用文献数

13

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It is well known that the fluid dynamics of arterial blood flow play an important role in arterial disease. The periodic blood flow through a stenosed tube with a moving wall is analyzed numerically. The Windkessel model is used to express arterial wall movement. A revised Casson model which is appropriate for numerical simulation is proposed as a constitutive equation of blood. The flow is assumed to be periodic, incompressible and axisymmetric. The influence of wall movement on flow through a stenosed tube is investigated. The flow pattern, separated region and the distributions of pressure and shear stress at the wall are obtained. The results show that the wall movement reduces the strength of vortex downstream of the stenosis and has considerable influence on the physical quantity of flow at the wall in one period. Therefore, it is concluded that the influence of wall movement should be taken into consideration for blood flow through a stenosed tube.

著者

金子 明成

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.61, no.585, pp.1880-1887, 1995-05-25

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A two-dimensional finite-element model for dye diffusion thermal transfer printing has been developed, in which partition coefficients are included. Experimental data of the partition coefficients and the dye diffusion coefficients are used in the model. Dye concentration after printing is not always continuous at the interface between the dye-coated layer and receiver-coated layer in the model. The stability of the computer calculation has been checked from various points of view. The optical density prediction shows good agreement with the experiments. The model has been applied to the calculation of the amount of transferred dye when the physical parameters of the medium are varied. It is concluded that the most important factors for increasing the amount are the dye diffusion coefficients and the partition coefficients.

著者

齋藤 彌平

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.209, 1934-09-01

著者

杉山 博之 小林 信之

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.66, no.642, pp.398-405, 2000-02-25

被引用文献数

3

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This paper establishes a new formulation strategy of the flexible beam with large rotation motion. The finite element based formulation, that is previously presented for the analysis of the 'Spaghetti Problem' by authors, is extended to realize the low order and high accuracy beam model using a kind of Component Mode Synthesis Method. The deformation of the flexible beam is modeled by the combination of static mode represented by the shape function and the analytically evaluated both end clamed dynamic mode with respect to the local coordinate system. Body attached local coordinate system satisfies that x-axis of it connects both-ends of the beam. To demonstrate the efficiency and the validity of the flexible beam model in Multibody Dynamics, a 2-link flexible robot arm is modeled as the flexible multibody system consists of some rigid bodies and two flexible beams. The validity can be indicated by good agreements between the numerical simulation and the experimental results.

著者

多田 茂 大島 修造 山根 隆一郎

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.57, no.536, pp.1257-1264, 1991-04-25

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A numerical method employing physical components of the tensorial quantity as dependent variables on boundary-fitted curvilinear grids is applied to the simulation of flow in arbitrary cross-section curved pipes for an imposed pressure gradient of oscillatory nature. The basic equations are formulated for Stokes fluid. The computation for a Newtonian incompressible fluid in curved concentric annuli and curved eccentric annuli was carried out for the range 10^3 ≤ De ≤ 10^5, 1 ≤ Wo ≤ 10^2, where De is the Dean number and Wo is the Womersley number. It is found that, at very low or very high Womersley number, the amplitude of the wall shear stresses derived numerically is in good agreement with that of the zero-th order of the asymptotic expansions of the solution of concentric annuli as the curvature parameter δ tends to zero, and that 2 pairs of secondary flow appear for even low Womersley number, contrary to the case of the circular coiled tubes.

著者

大内 久和 西田 佳史 本村 陽一 溝口 博

出版者

一般社団法人日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集

巻号頁・発行日

vol.2009, pp."2A1-B14(1)"-"2A1-B14(4)", 2009-05-25

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Designing age-appropriate and safe playground equipment requires scientific data. However, data is scarce. To collect data useful in playground equipment design, a playground equipment, 'Noboreon,' was created. Noboreon equipped sensors by which children's behaviors were recorded while they were playing on it. The paper describes data recording and collecting procedures using Noboreon and modeling process with data collected.

著者

竹中 二郎

出版者

一般社団法人日本機械学会

雑誌

機械学會論文集

巻号頁・発行日

vol.3, no.12, pp.217-219, 1937-08

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引張試驗における伸は標点距離に比例し、断面積の平方根(丸棒の場合は直径)に比例すると云ふBarbaの法則が一般に認められてゐるが、標点距離或は斷面積が著しく相違するものに対してこの法則が実驗の結果と適合しないことに気付き、この点を調査し併せて断面縮率と試驗片断面との関係を調査した。伸の測定は従耒の粗雜な方法では満足出耒ないので、著者の考案になる第1図の様な目盛及び測伸機を用ひて十分精密に測定した。この機械では標点距離を分割して目盛を切ることも出耒又切断後の標点距離の分割目盛間の伸びた長さをも測ることが出耒る。Tは試驗片で左右に滑ることの出耒る台の上に取りつけ、S及びDの目盛を見ながらハンドルH_1を廻して台を滑らせ適當な位置に耒たときこれを止めハンドルH_2を廻して刄物Cにより標点を試驗片に刻む。この方法により任意の長さの間隔に標点を刻むことが出耒る。又5mmの倍数だけ試驗片台を滑らせたとき台の動きが止るやうにも出耒るから5mmの倍数の長さの間隔に標点を刻むときには一々尺度の目盛を見ることをせずにハンドルを廻すだけで標点を刻むことが出耒る。切断した後の伸びた標点距離を測定するには切断面に於て一定圧力になるやうに試驗片の両端をばねの付てゐるねぢで圧し付けて台上に固定し、ハンドルH_1で台を滑らせ標点を顕微鏡のクロッスヘーアに合せてS及びDの目盛で長さを0.02mm迄読むことが出耒る。

著者

犬飼 幸男 多屋 秀人 佐藤 洋 蘆原 郁 倉片 憲治

出版者

一般社団法人日本機械学会

雑誌

環境工学総合シンポジウム講演論文集

巻号頁・発行日

vol.2006, no.16, pp.101-106, 2006-07-11

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National criteria for the assessment of low frequency noise annoyance in Sweden, Denmark, Netherlands, Poland and U.K. were reviewed, and the basic concepts were compared. The Experience from these countries in applying the criteria was also reviewed, and a common difficulty of these criteria in practice was showed. Japanese criterion, "Reference values of mental and physical discomfort" was compared with these criteria, and the advantages and the problems were discussed for future improvements in the criteria.

著者

橋本 知之 渡辺 義明 渡邉 光男 上條 謙二郎

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. B編 (ISSN:03875016)

巻号頁・発行日

vol.63, no.607, pp.765-771, 1997-03-25

被引用文献数

1

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The regions of cavity fluctuations in an inducer were investigated with three different types of housing : modified, original and straight. The region of rotating cavitation with modified or straight housing shifted to a higher flow rate range than that with original housing. Some results of visual observations suggested that the reversed flow aroud the tip of the inducer inlet is related to this phenomenon. The rotating cavitation velocity ratio seemed to approach 1.0 as the magnitude of shaft vibration increased. Another rotating cavitation was identified at a lower cavitation number than that at which attached cavitation occurred.