著者

田中 基八郎 松原 謙一郎 佐藤 太一

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. C編 (ISSN:03875024)

巻号頁・発行日

vol.61, no.592, pp.4730-4735, 1995-12-25

被引用文献数

16

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Strange sounds generated by machines express trouble or poor condition of the machines. Especially, in automobiles and air conditioners, strange sounds are paid attentions carefully, and the sources of those sounds are investigated and improved. To express strange sounds in Japanese, many kinds of onomatopoeia are used. Onomatopoeia is characteristic of Japanese culture. In this paper, the relationship between onomatopoeia expressing impulsive sounds and beat sounds, and the real sounds of the phenomena, are studied from the viewpoint of acoustic physics.

著者

川合 毅 水上 和明 小澤 芳男 本所 又嗣 大谷 恵 森 武宏

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.67, no.655, pp.744-750, 2001-03-25

被引用文献数

6

---

Refrigerated super-showcases are used for displaying and preserving food products at places such as supermarkets_ It is important that trouble occurring in showcases is anticipated in advance. However, there exist difficulties due to the existence of numerous types of units, inconsistent characteristics, and too few sensors, all of which make it hard to develop a standardized method of evaluation for determining if a showcase is operating correctly. In this paper, we propose a new method of occurrence-forecast of trouble for showcases by using criteria adapted to environmental conditions. This method is based on the characteristics of showcases that their operating state is influenced by environmental conditions. We have evaluated this method from field data of a supermarket. The result leads us to convince that this method can be put to practical use.

著者

森脇 俊道 杉村 延広 MARTAWIRYA Yatna. Y. 蜷川 達也

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.58, no.549, pp.1674-1679, 1992-05-25

被引用文献数

20

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This paper deals with an object-oriented modeling of an autonomous distributed manufacturing system and its application to the production scheduling. The architecture of the autonomous distributed manufacturing systems is discussed from the viewpoint of information processing in the manufacturing system. An object-oriented modeling method is applied to describe the decision-making activities and the communication activities of the components, such as the manufacturing devices and the workpieces. The activities of the objects are discussed in detail from the viewpoint of the production scheduling. The contents of the objects are clarified, and the part-of relations and the is-a relations between the objects are also established. A distributed production scheduling method is proposed on the basis of the autonomous decision making of the individual components and their coordinations.

著者

吉田 彰 大上 祐司 關 正憲 荒瀧 拓之 烏野 勇

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.67, no.661, pp.2961-2968, 2001-09-25

被引用文献数

4

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The purpose of this study is to investigate the influence of shot peening on surface durability of sintered powder metal rollers under a sliding-rolling contact condition. The compressive residual stress, the hardness and the surface roughness of the rollers increased and the pores near the surface of those were deformed by the shot peening. The failure mode of the rollers was mainly spalling. The failure depth agreed almost with the depth where the amplitude A(τ_<yz>/HV) of the ratio of the orthogonal shear stress to Vickers hardness became maximum. The surface durabilities of the shot-peened rollers were lower than that of the unpeened roller in these experiments. While, the spalling cracks propagated from the sharp notches of the pores deformed by the shot peening. In addition, it can be considered that the shear stress below the contact surface of the shot-peened rollers increases, since the increase of the surface roughness by the shot peening results into the increase of the frictional force between the rollers. Therefore, it could follows from this that the mild shot peening without sharp deformed pore and too large surface roughness should be selected in order to improve the surface durability of the sintered rollers.

著者

河西 省司 渡辺 淳吉 諏訪 正輝

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.45, no.398, pp.1119-1124, 1979-10-25

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モノレールや新交通システムに採用されている剛体電車線では,集電装置が離線しやすく,騒音が大ですり板の寿命が短い欠点がある.そこで,これらの問題点を解決する新しい集電装置を試作し,回転円板形等価実験装置を新設して各種実験し,新形集電装置と新しく開発した黒鉛分散鋳造銅合金すり板とを組み合わせた結果,騒音低減が著しく,また離線率およびすり板の寿命も現状品に比較し,格段に向上させることができた.

著者

柳澤 秀吉 KOSTOV Vlaho 福田 収一

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. C編 (ISSN:03875024)

巻号頁・発行日

vol.67, no.657, pp.1682-1688, 2001-05-25

被引用文献数

7

---

A method for supporting industrial design with special attention paid to the diversity of Kansei was proposed to respond to the quickly diversifying customers' requirements. As Kansei is very individualistic in nature, a new approach is needed to accommodate the difference from person to person to really reflect the customer's preference In terms of Kansei or his or her personal evaluation Kansei feature. Therefore, such a method was developed which creates a different Kansei space for each different user, by applying a semantic differential method and a principal component analysis to the impression words. A prototype system was developed with cellular phones as samples and the usefulness of our method was demonstrated.

著者

黒田 満

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.46, no.411, pp.1408-1413, 1980-11-25

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この論文は,計算機援助下での形状設計において有用な曲線創成報を扱っている.この方法によれば,任意の通過点,接線方向,曲率を指定して曲線形状を定義でき,さらに,その生成された曲線を他の機能的,審美的要求に合うように修正できる.この創成法は,Bezier曲線のなめらかな接続に基づいており,Bezier曲線の各種の図式的特徴を活用している.曲線の接続は,条件の視覚化と,Bezier曲線の穂坂表現式による式操作の単純化によって容易に扱える.

著者

大岡 昌博 三矢 保永 竹内 修一 亀川 修

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.62, no.598, pp.2250-2256, 1996-06-25

被引用文献数

7 10

---

The present paper describes the implementation of and experiments on a three-axis tactile sensor applying an optical wave guide plate. The sensor is comprised of a sparse array of columnar feelers and a dense array of conical feelers, which are formed on opposite sides of a silicon rubber sheet. The columnar feelers contact objects while the conical feelers contact the acrylic optical waveguide plate. Three components of a force vector applied to the columnar feeler are identified from contact areas of four conical feelers which are covered by one columnar feeler. Contact points of conical feelers photographed using a CCD camera are transferred into a frame memory board installed in a personal computer and they are memorized as 8-bit patterns. A one-bit pattern is quantized from the 8-bit pattern by utilizing a suitable threshold value; the contact areas of conical feelers are obtained from the total number of picture cells of the one-bit pattern. In evaluation experiments, several combinations of vertical and horizontal forces are applied to the columnar feeler through a probe attached to a three-axis force sensor. The experimental results show that the three components of the force vector can be calculated from the four contact areas, and that hard material is not favorable for the conical feelers but is suitable for columnar feelers.

著者

橋本 卓弥 平松 幸男 辻 俊明 小林 宏

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.73, no.735, pp.3046-3054, 2007-11-25

被引用文献数

1

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rights: 社団法人日本機械学会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110006453882/

著者

野波 健蔵 富成 襄 戸谷 隆美

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.50, no.449, pp.115-124, 1984-01-25

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方形波の分散によるひずみ波形をフーリエ級数展開近似による方法で計算し、方形波の分散波に関する特徴的形状をまず提示した。ついで、片持ばりに方形波を入力した場合について、有限要素法による数値解と実験から分散波に近い結果を得、現実に波形ひずみが生じていることを明らかにした。さらに、固有モードの形成過程を考察し、高い振動数ほど速く形成されることを明らかにした。

著者

林 圭一 芦田 極 藪野 浩司 黒田 雅治

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.73, no.732, pp.2225-2231, 2007-08-25

被引用文献数

3

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Usage of self-excitation as an excitation method for cantilever-probe in atomic force microscopy (AFM) has been proposed in order to improve the low quality factor Q in liquid environments. For realization of non-contact mode AFM, it is necessary to reduce the amplitude of the self-excited cantilever-probe. In this study, the self-excited oscillation of the cantilever-probe is generated by the angular velocity feedback. In addition, the small steady state amplitude is achieved by nonlinear feedback proportional to the squared deflection angle and the angular velocity. Regarding the micro cantilever-probe as a micro cantilever beam, we show the equation of motion in which the geometrical nonlinear effect is taken into account. Averaged equation is derived by applying the method of multiple scales and the bifurcation diagram is theoretically described. Then, it is clarified that the amplitude of the cantilever-probe can be reduced by increasing the nonlinear feedback gain. By using our own making AFM, we demonstrate the nonlinear dynamics of a "van der Pol" type self-excited cantilever. Steady state amplitude of self-excited oscillation is reduced to 8 nm.

著者

津田 吉広 田村 英之 末岡 淳男 松岡 寛憲

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.60, no.578, pp.3300-3307, 1994-10-25

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The characteristic which the Duffing oscillator with a softening spring property under harmonically stimulating force presents in the main resonant region has been investigated numerically. With regard to the structure which the system exhibits in this region, there exists another branch which appears due to bifurcation from the resonant branch at a certain frequency, in addition to the resonant and nonresonant branches. It has been clarified that many kinds of periodic solutions exist in the region between this new branch and the resonant one. Furthermore, besides the traditional harmonic solutions, i. e., resonant and nonresonant solutions, it has been shown that another harmonic solution appears, although it is unstable. This unstable solution enables us to reasonably explain the constitution of attractors in this resonant region. Chaotic phenomena, which appear due to period doubling bifurcation also exist.

著者

田村 英之 松崎 健一郎 岡部 匡

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.60, no.579, pp.3719-3726, 1994-11-25

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In the previous paper, the general theory of exact solutions in a family of Duffing oscillators including hard, soft and snap-through spring systems was studied. In particular the paper discussed the hard spring system in detail, and a listing of the numeration program was included. As a continued report, the soft spring system is dealt with here in detail. All the free vibrations in a family of Duffing oscillators are solved exactly and formally in terms of a family of Jacobian elliptic functions ; however, their precise numeration is a very important task. The present study is devoted to discussing excellent algorithms/programs. A FORTRAN program with the precision of REAL * 16 is presented, which ensures an accuracy with relative error of less than 10^<-30>. The listing of the program and numerical results of the dynamics of the Duffing oscillator with the soft spring system are demonstrated.

著者

大山 忠夫 大矢 光伸

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.52, no.475, pp.1037-1046, 1986-03-25

被引用文献数

1

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From our experimental results previously reported, it was considered that the formation of water film between contact surfaces remarkably influenced on adhesion force or contact mechanism under water lubrication. Here are reported the results of numerical analysis based on the Herrebrugh's integral equation for applying the EHL theory to water lubrication of steel rollers. The formulas of film thickness were obtained with various EHL parameters for lower pressure-viscosity coefficient such as that of water. Furthermore, it was shown that the adhesion coefficients previously obtained were well related to the contact load supported with asperities through water film, which was estimated by assuming asperities with spherical summit on one surface and Gaussian asperity height distribution.

著者

池俣 吉人 佐野 明人 藤本 英雄

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. C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.738, pp.365-371, 2008-02-25

被引用文献数

1

---

A passive walker can exhibit a stable limit cycle. In our earlier work, a global stabilization principle of fixed point has been established mathematically, provided that the state just after heel-strike exists at the next step. However, this condition may not always hold. The passive walker with knees can execute the leg-swing motion with no control, only by gravity effect. Unfortunately, while the walker takes a step forward, the swing leg may strike its toe on the slope at unsuitable point. Therefore, understanding of the mechanism of swing-leg motion is very important for assuring the next step. In this study, we focus on the flexion and extension of knee joint of swing leg. In this paper, first, an equation of angular acceleration of knee joint is derived by simplifying and linearizing the model of passive walker. Then, the mechanism of the flexion and extension of knee joint of swing leg is explained.

著者

秋元 俊成 松元 明弘

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.73, no.733, pp.2537-2542, 2007-09-25

被引用文献数

4

---

In this paper, we introduce a new mechanism of quasi-passive-dynamic-walking machine which uses actuators just only at ankle joints. First, we analyzed about basic mechanisms of passive dynamic walking. So, we made and modeled the passive dynamic walking machine that walks down the slope. Experiment of the walking was compared with the numerical analysis, which showed the validity of the model. And, these were analyzed from the energy point of view. Second, we proposed a new control method of quasi-passive-dynamic-walking based on the result of analysis of passive dynamic walking. The new method was confirmed by the numerical analysis on a horizontal plane. Finally, ankle-driven type of quasi-passive dynamic walking machine was designed and developed. Experiment of the walking on the horizontal plane was done. That result shows the validity of the idea.

著者

洲崎 章弘 太田 雅晴 由良 憲二 人見 勝人

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.59, no.561, pp.1581-1587, 1993-05-25

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This paper describes a strategy for foreign direct investment (FDI) of multinational enterprises when manufacturing costs change with time. This FDI planning problem is formulated in order to determine how many manufacturing facilities are needed in each country when they are needed, and how many products should be manufactured to meet the product demand in each country. It is assumed that both product demand and manufacturing costs in each country change with time. Finally, an algorithm for finding an optimal solution of the FDI planning problem is developed and an example is demonstrated.

著者

三村 宣治 小野寺 良二

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.72, no.724, pp.3798-3805, 2006-12-25

被引用文献数

1

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This paper investigates a calibration method of 6 DOF acceleration sensor system using multiple linear accelerometers. So far, it has been considered that a set of 6 DOF acceleration data is to be essential to its calibration. In this accelerometer system, 6 DOF acceleration can be resolved using the geometrical condition of 6 linear accelerometers. Therefore, the measurement error results from the alignment error of the 6 linear accelerometers. And so, we analyze the alignment error and give a caribration method to identify the error only using some limited linear accelerations (acceleration of gravity). This paper discusses its calibration method with experiments for our prototype 6 DOF accelerometer. The results show that the calibration using limited data is possible and has good performance.