著者

石川 敏也 中田 毅

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.74, no.738, pp.359-364, 2008-02-25 (Released:2011-03-04)

参考文献数

8

被引用文献数

1 3

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In this study we aim to realize an actuator that is comparable with a natural muscle from a viewpoint of flexibility, the output force and the responses. In the 1st report we constructed the Shape Memory Alloy (SMA) actuator protected by “a rolled film tube” with the high heat resistance and the high flexibility, and it is named “the unit cell”. In this report we constructed an actuator named “a motor unit” with the larger output force by bunching up 7 unit cells, and the characteristics of the motor unit are investigated by the experiments in which the motor unit is driven in Pulse Frequency Modulation (PFM). The result of the experiments shows that the static characteristics of the output force and the displacement to the input pulse frequency in the motor unit near proportion relations in comparison with the unit cell still more and the output force increases almost 7 times as large as the unit cell. It is found out that the time constant of the motor unit becomes larger compared to that of the unit cell, and the power conversion efficiency falls when pulse width is extended to improve the time constant.

著者

大庭 拓也 山田 幸一 岡田 信之 相馬 仁 谷藤 克也

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.75, no.757, pp.2459-2467, 2009-09-25 (Released:2017-06-09)

参考文献数

17

被引用文献数

3 2

---

Rolling stock has been generally inspected and maintained on the basis of the preventive maintenance. However, the reliability of the sensors and information technology has drastically improved, and with this background the objective of this research is to develop the condition monitoring system for the bogies of the Shinkansen cars. This paper describes an algorithm for detecting fault in some parts of bogies. This scheme is based on the statistic analysis of vibration acceleration during some period. This algorithm named peak average method detects the difference of the vibration peak distribution between fault cases and normal ones. For examining the possibility to detect fault in the bogie, experiments simulating some fault modes in bogie parts are conducted in the rolling stock test plant at Komaki Research Center of CJRC. From the results of these experiments, we can show the reliability and the validation of this scheme for monitoring conditions of Shinkansen bogies developed in this research.

著者

安達 瑛二 中村 吉彦 戸次 良治 大西 郁生

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.62, no.598, pp.2511-2515, 1996-06-25 (Released:2008-02-26)

参考文献数

2

---

To materialize actual designs in computer-aided design, we presented a method to determine structural dimensions in order to make all design requirements accomplish their respective objective values, using the attainability and simultaneous equations with several unknowns. However, most of the designs have no theoretical design formula or sensitivity coefficients. This paper presents an approximation method to identify sensitivity coefficients by trial production evaluations of the designs. The coefficient matrix is specified between k th revised values of the attainabilities and k th revised values of the design variables, and made into a square or a triangular matrix by neglecting insignificant variables. The matrix is solved iteratively until all coefficients converge. This paper also presents a multiobjective satisfactory design using the identified coefficients to prove the effectiveness of the identification, comparing the identified coefficients with the theoretical ones.

著者

八尾 佳宏 貝原 俊也 藤井 信忠

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.772, pp.3198-3205, 2010-12-25

---

Under the volatile economic situation in recent years, manufacturers need to have a high level of flexibility to manage a wide variety of products in varying quantities within a short delivery lead time. But in dynamically changing manufacturing environment, it is quite difficult to optimize interdivisional scheduling which reduces total manufacturing cost of all divisions such as raw material procurement, machining, assembling and shipping following fluctuations in demand. To solve this problem, we propose a new interdivisional scheduling method which decomposes the whole problem into process-dependent problems using inter-process lead time and cooperates between processes by applying Lagrangian decomposition coordination method. Additionally we designed the method which can adjust inter-process lead time automatically in order to respond to the changing demand of each item. Then we examine the effectiveness of this method by numerical experiments.

著者

岩野 治雄 正木 信男 鎌田 崇義 永井 正夫

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.75, no.754, pp.1784-1790, 2009-06-25 (Released:2017-06-09)

参考文献数

9

---

It has been shown in our previous report that DYC is not compatible with the tire force usage equalization and it is important to consider total tire force F_x and F_y as feedback signals for DYC being compatible with the tire force usage equalization. However the driving stability of the electric vehicle is affected how the weighing matrix's coefficients of the criterion function are chosen because our control logic based on the optimal control of the yaw moment, total tire force F_x and F_y, and the tire force usage equalization. In this paper, we proposed a method for the determination of the weighting coefficient of our control logic with quality engineering. By using this, we can make clear the relation between the optimal control error and the driving stability of the electric vehicle how the weighting coefficients are chosen. It was found that the controller using the optimal control having the weighting coefficients determined by the quality engineering method has robustness for the driving stability in various driving conditions. Therefore, it was effective to use quality engineering for vehicle dynamics control.

著者

神谷 和秀 神谷 長幸 野村 俊 田代 発造

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.10-15, 2007-01-25

被引用文献数

1

---

Leonardo da Vinci is not only famous as the artist who painted master pieces such as "The Last Supper" and "Mona Lisa", he is also a great scientist and engineer. He left records of many original scientific investions and explorations in books now known as Leonardo's Codices. These codices include anatomical charts, mechanical equipment, civil engineering concepts, and drawings related to architecture, astronomy, botany, and so on. The contents of these Codices are interesting for beginners who are studying mechanical engineering, although beginners are not used to recognizing a solid from a drawing. Therefore, models were reconstructed from the drawings in these codices, to be used as teaching materials for the study of mechanical engineering. In a lecture as part of a mechanics course, it was possible to generate an interest in mechanical engineering among beginners who studied the mechanics by using the reconstructed models. Similarly, an opportunity to consider the field of mechanical engineering was given to students of primary schools, junior high schools, senior high schools, and their parents, by the reconstructed models presented in the DA VINCI Festival at Toyama Prefectural University.

著者

藤原 宏樹 山内 和人

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.745, pp.2308-2314, 2008

被引用文献数

1

---

A logarithmic profile is an essentially optimal geometry for rolling machine elements such as bearing rollers and raceways. Under most conditions of loading, it yields less stresses to give longer endurance. Lundberg first suggested the basic profile, and some researchers followed him by modifying it to suit engineering requirements. The authors also proposed a mathematical optimization method for various profiles including a logarithmic one in roller bearing applications. In this paper, rolling contact fatigue life tests are carried out to make a comparison of logarithmic, standard partially crowned and modified partially crowned rollers when they are applied to cylindrical roller bearings. Results show that the logarithmic and modified partially crowned rollers are comparable in fatigue life, and outlast the standard partially crowed rollers if they are fully lubricated. On the other hand, under poor lubrication, the logarithmic rollers are found to yield outstanding fatigue life over the modified partially crowned ones.

著者

松岡 信一

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.55, no.517, pp.2481-2486, 1989-09-25 (Released:2008-02-21)

参考文献数

8

被引用文献数

4 5

---

This paper give a description of an experimental study of ultrasonic welding of ceramics and aluminium or copper. The ultrasonic welding technique can be carried out in many different ways, such as in direct welding of ceramics and metals, the coating of metal on ceramics surface by vacuum deposition, and in application of inserting of activated metals. The ultrasonic welding has made possible to weld various ceramics, such as SiO2, Al2O3, SrO, BaO, ZrO2, Si3N4, SiC, to aluminium or copper under the room temperature quickly and easily compared to other welding methods. For example, the ultrasonic welding of Al2O3 and aluminium could be finished under the condition of amplitude 23μm of ultrasonic horn top, welding pressure 20 MPa, required duration 0.3 s. The clean with a forced ultrasonic vibration of contact surface needs no surface treatment. Moreover, the material can be processed easily, and it gives out little heat, and hardly get weakness.

著者

武藤 一夫 市川 二朗 大泉 敏郎 中島 宣洋

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.67, no.663, pp.3650-3655, 2001-11-25 (Released:2008-02-26)

参考文献数

5

---

In this paper we describe the effect of die-sinking EDM under mirror finishing conditions on mirror surface properties of four-different types steel, SKD11, NAK55, PX5 and SKD61, which contain the free cutting element, sulfur. In particular, the influences of the quantity of sulfur on the machined steel surface, the composition and microstructure with die-sinking EDM. The following conclusions were obtained. 1) A mirror surface of steel containing more than 0.04% sulfur could not be realized. 2) In the case of steel with 0.1% sulfur, the surface property is dependent on the machining direction. 3) Pits are generated on the machined steel surface because the aggregated part of the MnS fiber preferentially melts with the circumferential base metal. In addition, the quantity and shape of pits change according to those of MnS. In the longitudinal section, the shape of the pit is a series of channels, whereas in the transverse section it is a cirele.

著者

山本 哲彦 花田 真一 中園 邦彦 金城 寛 玉城 史朗

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.61, no.591, pp.4276-4281, 1995-11-25

参考文献数

3

被引用文献数

5

---

In this work we consider unstable control objects such as an inverted pendulum. Two evaluation procedures in genetic algorithm (GA) are set. The first involves the following steps : set two limits, -Θ and Θ, on both sides of the unstable equilibrium point, set an initial point θo in [-Θ, Θ], initiate a motion, measure the time when the motion reaches one limit, repeat simulations of neuro-control, select neural networks in order of length of holding times, and apply GA-crossover to superior neural networks of long holding times. The second involves the following steps : select neural networks in order of shortness of settling time to the equilibrium point, and apply GA-crossover to superior neural networks of short settling times. We adopt only the first evaluation procedure in the early generation stages of GA. After the number of neural networks of controllability reaches a sufficient percentage of all the neural networks in a computer, we adopt the second evaluation procedure, and GA evolution is continued. Neural networks of controllability appear at about the 10th generation and evolve to the ability limit predetermined by the structure of neural networks.

著者

則竹 茂年 中野 冠 木村 文彦

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.72, no.724, pp.3955-3961, 2006-12-25 (Released:2011-03-04)

参考文献数

9

---

As manufacturing activities have been widely globalized, it is becoming more and more difficult to respond to changes quickly. It is also important to take a positive stand against environmental issues to pursue the sustainability of the global environment without wasting resources related to production activities. The purpose of this paper is to establish a lifecycle-oriented design method of production systems. For this end, we have developed prototype system for life-cycle simulator, which is constructed by a demand scenario generation module and a simulation assessment module. We also conducted a simple comparative experiment taking two configuration plans for a transfer line and a cell line as examples in order to verify the effectiveness of this proposed technology.

著者

舟木 治郎 渕 拓也 大西 祐介 長坂 繁弥 多久島 朗 佐藤 誠司 平田 勝哉

出版者

The Japan Society of Mechanical Engineers

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.77, no.779, pp.2795-2804, 2011

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The present study is a fundamental approach to reveal the minute fluctuating pressures on three-dimensional blade surfaces of a basic propeller fan. Because, among the concerning physical quantities, the unsteady pressures on the rotating blades give us useful information for the fan flow and its sound-noise level. The authors correct the centrifugal-force effect, the gravitational-force effect and the other leading-error effects for accurate measurements of the minute pressures using a measuring technology developed by the authors (Hirata et al., 2009). As a result, we show the Reynolds-number effects and the spatial distributions on the blade of both time-mean pressure and pressure-fluctuation intensity.

著者

山本 哲彦 吐合 隆拡 中園 邦彦 金城 寛 玉城 史朗

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.62, no.601, pp.108-113, 1996-09-25

参考文献数

6

被引用文献数

2

---

Genetic algorithms (GAs) with rough evaluations can prompt the evolution of neural networks that are able to control unstable dynamic systems. The proposed control method exploits the advantage of GAs that time-varying evaluations can be easily incorporated. First an easy evaluation in GAs induces the appearance of neural networks with controllability. Second, an evaluation of settling time prompts the evolution of neural networks that show high performance. The method is applied to the stable control of a bicycle. Neurocontrol of the steering at direction change causes reverse response like that of a human cyclist.

著者

福澤 健二 寺田 諭 式田 光宏 雨川 洋章 張 賀東 三矢 保永

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.72, no.723, pp.3655-3664, 2006-11-25 (Released:2011-03-04)

参考文献数

11

---

A novel micro-mechanical probe for friction force microscopy has been presented. The probe has a double cantilever that is supported by a torsion beam. It measures the lateral force by detecting the deflection of the double cantilever and measures the vertical force by the torsion of the torsion beam. It can measure the two forces independently without the mechanical crosstalk. The force resolution is of the order of 1 nN. The probe can clarify the micro/nanotribological phenomena more accurately than conventional cantilever probes and provide useful information for the identification of material properties.

著者

木村 仁 遠藤 真美 小関 道彦 伊能 教夫

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.740, pp.806-813, 2008-04-25

参考文献数

17

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A phenomenon that passengers are getting sleepy is often found in running cars or trains. If a mechanism can reproduce this phenomenon, it is feasible to put insomnia patients or infants to sleep without any harmful effects. This will bring extreme benefit for insomnia patients or parents of babies. The purpose of this study is to elucidate the sleep-inducing factors of running cars or trains, and the final goal is to develop a machine which reproduces the environment to put people to sleep. For the first step of this study, we investigated the relationship between sleepiness and vibrations on several trains. The sleepability of each train is discussed by the ratio of sleeping passengers. According to the vibration analyses, the results suggest that comfortable vibration for sleep has mainly low-frequency (〜2 Hz) vibration with particular fluctuation. In addition, it is also guessed that low level jerks contribute the sleepability.

著者

池田 敦 山口 正博 高崎 勝明 長井 直之 中島 満則

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.1241-1246, 2001-05-25

参考文献数

9

被引用文献数

1

---

It's commonly known that a frictional force between two sliding surfaces can be reduced to excite the ultrasonic vibration on the one side of a solid body surface. The low-friction effect due to the application of ultrasonic vibration remains valid for the friction between paper and metal as well as between metals. To make a frictional decrease mechanism clear, we observed the behavior of a solid body on the vibrated surface. In the case of a frictional force is zero, the levitation distance is as the same as theoretical distance. If the amplitude of vibration is decreased, the distance between the solid body and the vibrated surface will be also decrease, and frictional force will be raised.

著者

佐藤 知正

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.49, no.439, pp.401-409, 1983-03-25 (Released:2008-02-21)

参考文献数

6

---

音響ホログラフィとソナーを融合させた三次元音響撮像法「ホログラフィック・ソナー撮像法」を提案した。これはFMチャ-プ音を対象物に照射し、反射音波を記録し、これにパルス圧縮および開口合成の処理をおこなって三次元映像を得るものである。この撮像方式での撮像性能を解析し、撮像装置の設計手順を明らかにした。また、空中音響実験によって、本撮像方式の撮像性能解析の妥当性と三次元撮像の可能性を示した。

著者

橋村 真治 村上 敬宜

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.68, no.671, pp.2137-2144, 2002-07-25 (Released:2008-02-26)

参考文献数

8

被引用文献数

3

---

The clamping force of a bolted joint is usually controlled by torque or angle at tightening. However the fatigue failure of bolted joints occures if the clamping force is loosened in service. Therefore the clamping force in service after tightening must be checked to avoid failure of bolted joints. In this study, a new method to detect the clamping force of bolted joints after tightening has been proposed, in which the clamping force is detected by pulling the protruding thread of the bolt through the nut on a bolted joint. The relationship between the pulling force and the displacement at the pulling point is measured to detect the apparent spring constant of the bolt. When the pulling force reaches the clamping force of bolted joint, the apparent spring constant varies markedly. Thus the clamping force of the bolted joint can be defined on the basis of the variation of the apparent spring onstant. The basic theory and the experimental verifications are presented.

著者

劉 孝宏 末岡 淳男 白水 健次 江村 篤裕 中野 寛

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.70, no.689, pp.30-37, 2004-01-25 (Released:2011-03-04)

参考文献数

11

被引用文献数

2 2

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This paper deals experimentally with the squeal and chatter phenomena generated in mountain bike disk brakes. First, the authors performed the traveling test using actual bicycle on downhill road in a mountain. As the results, there are two kinds of frictional self-excited vibrations in the bicycle disk brakes called by squeal with frequency of 1 kHz and by chatter with frequency of 500 Hz. In order to regenerate the squeal and the chatter, a bench test apparatus by actual bicycle was set up and their characteristics were experimentally examined. By using the bench test apparatus, it was made clear that their frequencies were independent of temperature of pad and rotating speed of rotor, and the chatter was generated in a certain limited region of high temperature though the squeal occurred in arbitrary temperature region of pad.

著者

天摩 勝洋 前澤 成一郎

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. C編 (ISSN:03875024)

巻号頁・発行日

vol.46, no.410, pp.1191-1198, 1980-10-25

被引用文献数

1

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非線形性の大きい本質的非線形強制振動系の近似解法として,非線形復元力を断片線形関数で近似する等価断片線形系の選定の仕方と,さらにこの等価断片線形解を母解として摂動法を適用する近似解法を提案する.この方法による近似解の精度を推定するために,厳密解の知られているだ円形ダッフィング方程式にこれを適用し,漸硬ばねと漸軟ばねの場合について数値計算した結果を厳密解と比較して,満足すべき精度が得られることを示した.