著者

久保 愛三 清野 慧

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.401, pp.86-98, 1980-01-25

被引用文献数

5

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はすば歯車の正面ならびに歯すじ方向歯形誤差が歯車振動をひきおこす程度の歯のこわさ変動をも考慮して評価する近似的方法を示し,中凸形正面歯形がはすば歯車においても平歯車の場合と同様に最も害の少ない,あるいはその大きさを適当に選ぶならば歯形修整の効果のある歯形形状であること,全かみあい率あるいはねじれ角が大きくなると正面歯形形状にかかわらず歯車振動の起振力が著しく小さくなることなどを明らかにした.

著者

平松 力 長谷川 健吾

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.404, pp.392-400, 1980-04-25

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大型扇風機において,羽根表面にごみなどが付着し,アンバランス力による過大振動や騒音を生じることがある.この系は,がたを含む非対称復原力の方程式となり,回転数の高調共振を起こすことがある.この問題について解析し,時系列言語を用いて数値解析し,ガード共振の計算結果と測定値とのよい一致を得た.それよりがたを含む非対称復原力の振動系では,回転の二次高調波に対し固有振動数を15%以上離すべきことを明らかにした.

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

---

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

藤井 進

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.600, 1996-08-25

著者

永瀬 和彦 近藤 和宏 野村 俊明

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.63, no.606, pp.620-627, 1997-02-25

参考文献数

6

被引用文献数

3

---

Many trains were derailed and damaged by the earthquake in Kobe on January 17, 1995. At the same time, many railway girder bridges and viaducts were seriously damaged by the quake. It was postulated that serious accidents could occur as a result of trains running at high speeds into these girder bridges or viaducts. Fortunately, no fatal accidents occurred. On investigating such accidents, the authors found that they rarely occur, because a train derailed by the violent shock of a quake is so radically decelerated by the huge running resistance caused by the derailment that it stops just after the quake. On the other hand, it takes some time until the bridges or viaducts collapse after the quake.

著者

関山 浩介 福田 敏男 松村 司郎 山田 康二

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.63, no.605, pp.196-203, 1997-01-25

参考文献数

12

被引用文献数

2

---

This paper deals with a modeling and controlling strategy for multirobot group behavior. While the distributed autonomous robot system has the advantage of flexibility, it also has difficulties in coordinating global system such that the designer expects. We present a methodology for the designing issue for group robotics. Self-organization is a natural principle in a dissipative system. Utilizing this principle, we present the top-down and bottom-up hybrid approach and a basic model for coordinating macro-scale group behavior as a framework for the self-organizing control of group behavior. Then we present the model of strategy formation in the system based on the opinion formation model. The analytical predicted group behavior is verified by simulation results. In particular, we realize self-organization of temporal behavior pattern in group-level cooperation.

著者

鈴木 健太 渡邉 鉄也 田中 基八郎

出版者

社団法人日本機械学会

雑誌

日本機械学會論文集. C編 = Transactions of the Japan Society of Mechanical Engineers. C (ISSN:03875024)

巻号頁・発行日

vol.74, no.746, pp.2549-2554, 2008-10-25

参考文献数

8

被引用文献数

1

---

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/110006967447/Generally a coefficient of friction of a human finger is very higher than a coefficient of friction of metal. The physical characteristics of a human finger are important in the work by hand. Therefore, the physical and numerical modeling of fingertip is useful for the design of various equipments, for example, a handrail of stairs, a robot hand, an operation simulator, and so on. In this study, "Coulomb friction", "absorption by fingerprint and sweat" and "elasticity of finger" are considered as the element of the friction characteristics. The aim of this study is to express the force by these characteristics as function model and to make the physical fingertip model. At first, the force by friction and absorption are measured, and the contact area between fingertip and board is calculated. Next, the function of friction force with respect to vertical force acting on the contact surface between fingertip and board is suggested. Finally, the actual finger model is made and the friction force is modeled to the function.

著者

茨木 博 橋本 巨

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.75, no.757, pp.2596-2603, 2009-09-25

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This study is concerning the optimum design of a water nozzle for firefighting equipment used to protect large indoor spaces and high-rise buildings. Water nozzles for such use are required to have a long range of reach and/or a wide coverage. Such performance can be obtained by simply increasing the flow rate, but that is caused substantial pressure loss by the fluid friction within the nozzle and the pipe. The objective of this study is to obtain a water nozzle with minimum fluid friction by optimum design, as a result the size of piping, pump and water reservoir for firefighting equipment can be minimized. The conventional water nozzle used in firefighting is called the smooth bore nozzle, which have a wedge-shape profile whose diameter decreasing toward the exit. However, whether or not this shape is optimum have not been known. In this study, a method is presented to obtain a friction-minimum nozzle profile, while setting the inlet-and outlet-diameters and the length of the nozzle as fixed parameters. It was found that the half-spindle-type nozzle, whose diameter is almost constant along the length but quickly decreases at the exit, shows the smallest friction than the other profiles (i.e. smooth-bore, straight and concaved), therefore showing maximum arrival distance.

著者

南斉 亮佑 中村 憲正 藤江 裕道

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.76, no.769, pp.2340-2344, 2010-09-25

---

We have been developing a new tissue engineering technique for cartilage repair using a scaffold-free tissue engineered construct (TEC) bio-synthesized from synovium-derived mesenchymal stem cells. A round-chondral defect of 8.5mm in diameter and 1.5mm in depth created on the medial condyle of 12 month-old mature porcine femur was filled with the TEC. Six months after surgery, a cylindrically shaped specimen of 4mm in diameter and 4-5mm in depth was extracted. Micro-indentation test was performed on the specimen using an AFM after the surface image of the specimen was obtained. Macro-scale compression test was, then, performed for the specimen using a custom made micro compression tester. As compared with many bump-like elevated portions of approximately 1-2μm in height observed in the surface of normal cartilage, rougher surface was observed in the TEC-treated and TEC-untreated tissues. The surface stiffness of the TEC-treated tissue was significantly lower than that of the normal cartilage, and slightly lower than that of the TEC-untreated tissue with no significant difference. In the quasi-static compression test, the tangent modulus of the TEC-treated tissue indicated no significant difference against the normal cartilage. In contrast, the tangent modulus of the TEC-untreated tissue was lower than those of the normal cartilage and the TEC-treated tissue, with a significant difference against the normal cartilage. It is suggested that the surface stiffness was independent of treatment of TEC, while the bulk modulus recovered well in the TEC-treated cartilage-like tissues as compared with the TEC-untreated cartilage-like tissues.

著者

堀 光平 林 巖

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.596, pp.1548-1555, 1996-04-25

被引用文献数

6

---

To improve the efficiency of 3K-type mechanical paradox planetary gear drive, a new design method called the approach-and recess-contact ratio equalization method is proposed and described. The concept of this method is to satisfy the coaxial condition of the rotatory- and fixed-internal gear pairs, which have a large influence on the efficiency of the gear drive, and simultaneously to maximize their efficiency. For this purpose, first the contact ratios of the two internal gear pairs are given ; second, their profile-shift coefficients are determined so that the coaxial condition can be satisfied ; then, the diameters of their addendum circles are determined so that their approach- and recess-contact ratios can be equalized. The efficiency of the gear drive obtained by this design method is theoretically calculated under the assumption that the tooth surface frictional coefficients are all 0.1. Consequently, the maximum efficiency of 86.1% is obtained on a gear drive with a reduction ratio of 1/351 and a contact ratio of 1.2. This obtained efficiency is higher by 12% and 8% than the efficiencies of 74% and 78%, obtained by the conventional design method without and with profile-shift coefficient optimization, respectively.

著者

西村 秀和 加山 竜三

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.676, pp.3644-3651, 2002-12-25

被引用文献数

7

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In this paper we design a controller for a semi-active suspension using a magneto rheological (MR) damper. We formulate the linear-parameter-varying system taking account of the mechanism of a fictitious damper model includes valve stroke of the orifice and the damping coefficient restriction. The gain-scheduled controller is obtained with linear matrix inequalities and we confirm that the controller according to the varying parameters is superior to the semi-active damper utilizing the sky-hook damper theorem by simulation. Furthermore, we propose the control method using the relation between the input current and the damping coefficient of the MR damper that is experimentally obtained. By carrying out experiments it is verified that the designed controller for the semiactive suspension using the MR damper has the desired good performance.

著者

井上 義之 横山 豊和 山根 賢治 田中 敏嗣 辻 裕

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.63, no.606, pp.356-363, 1997-02-25

被引用文献数

2

---

The motion of balls in a tumbling ball mill was simulated numerically using the discrete element method (DEM). Simulations are performed for the two-dimensional and three-dimensional cases. To study the difference between two-dimensional and three-dimensional powder milling analyses, the ball motion was analyzed. It was found that there is no significant difference between the flow patterns for the two-dimensional and three-dimensional cases, but some properties such as the trajectory of the center of the gravity of the balls, the profile of the average velocity vector, the average ball velocity and the fluctuation velocities of the balls show significant differences.

著者

熊谷 徹 秋田 敏 和田 充雄

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.58, no.550, pp.1781-1786, 1992-06-25

被引用文献数

1

---

We present a new learning control method to control a multi-input-output system. In conventional learning controllers using a neural network, it is difficult to treat a multi-input-output system because of the difficulty in designing reference models. Hence, we propose to divide a complex plant into sub-plants and to use a learning controller for each one. We use our method to the regulation problem of the inverted pendulum that is a one-input, two-output system. In the simulation and the experimental system, we regulate the inverted pendulum and show the effectiveness of this method. We also show that our learning control system can regulate a system that has a time lag between the input and the output signals. Moreover, we show that a reference model of order lower than the plant order is available.

著者

小林 吉之 嶺 也守寛 藤本 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. C編 (ISSN:03875024)

巻号頁・発行日

vol.73, no.725, pp.274-279, 2007-01-25

被引用文献数

1

---

To determine the accuracy of foot position sense in the means of foot placement, young adults were asked to place either medial edge or lateral edge of their feet along the base line on the floor as close as possible, and the edge of placed feet were scanned by using laser displacement gauge. From the collected data, constant error, the distances between the edge of placed feet and the base line on the floor, and absolute error, the absolute distances between the edge of placed feet and the base line on the floor were denned and compared between the medial or lateral trials, and dominant leg or indominant leg. The statistical analysis showed significant differences of constant error between the trials only. The trials to place their medial edge tend to place their feet away from the base line, and the trials to place their lateral edge tend to place their feet in to the base line. These results indicate that we tend to expect the position of our feet more medially than actual, and these discrepancy may be one of a reasons of tripping or banging of our feet to the obstacles while walking.

著者

中田 毅 曹 東輝 謝 啓裕 山内 洋 山内 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. C編 (ISSN:03875024)

巻号頁・発行日

vol.57, no.542, pp.3228-3233, 1991-10-25

被引用文献数

4

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This paper deals with a new concept of an optical servo system and an experimental analysis on photostrictive ceramics for use as an optical actuator in the servo system. The optical servo system proposed here may be characterized by the introduction of an opto-hydraulic control valve into the system. The opto-hydraulic control valve can be operated by an optical actuator which is directly dirven by light irradiation. The photostrictive effect in PLZT ceramics, which is produced from the superposition of the photovoltaic effect due to light irradiation and the piezoelectric effect, is evaluated experimentally from the viewpoint of the applicability to a servo actuator. Experimental results show that the PLZT (3/52/48) ceramics produce a strain as large as conventional PZT ceramics, but that they have a very slow dynamic response of about 100 sec. The slow dynamic response is due to the time lag in the photovoltaic effect.

著者

田中 真美 長南 征二 江 鐘偉 中島 英貴

出版者

日本機械学会

雑誌

日本機械学会論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.65, no.631, pp.970-976, 1999-03

被引用文献数

4

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This paper is a study on the valuation and mathematical formulation of human touch sensation. First, the feelings of touch are collected on five natural and chemical fabrics through the SD (Semantic Differential) method questionnaires sent to twenty three examinees. The feelings are valued on each fabric by using the weigthed mean on graded factor feelings. The multiple regression analysis is then introduced to represent the overall evaluation of touch on every fabric by a linear function of the valuations on feelings of touch. Next, a soft tactile sensor made of a PVDF (Polyvinylidene Fluoride) film patch and rubber layers is assembled and slid over the same sample fabrics to collect the surface tactile information on the fabrics. The features on the collected data are then extracted by calculating the temporal average of absolute out signal and using the intensity of power spectral density on the medium frequency range. Comparison of the results show that the PVDF sensor well describes the tactile perception of forefingers.

著者

城間 直司 石川 哲史 井上 康介 福岡 泰宏 森 善一

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.76, no.763, pp.619-626, 2010-03-25

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Autonomous control of an articulated steering type vehicle such as a wheel loader, which is usually used at surface mining fields to load mineral resources and rocks, is highly expected for operation cost reduction. A wheel loader is one of heavy machines which is also used for snow removing and/or loading operation at construction fields because of its high mobility. Its steering system is articulated steering and the rear wheels follow tracks where the front wheels have traveled. We have introduced a new virtual velocity constraint of the vehicle and formulated nonlinear state equations using two velocity constraints. A nonlinear state-feedback controller is designed using exact linearization. Simulation and experimental results show that an articulated steering type vehicle can follow a straight line with the proposed feedback control method.

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

---

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.