著者

永瀬 和彦 中村 英男 小林 秀之

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.56, no.523, pp.797-802, 1990-03-25

被引用文献数

1

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The authors constructed "slipping adhesion test bogie" designed upon a new idea of measuring the coefficient of adhesion continually while running, and have observed the state of adhesion on main lines since 1985. Recently, they placed a car equipped with this bogie on a steep line where wheel-spin and skidding of rolling stock had been frequently the cause of troubles. As the result of runs of the car under various weather conditions such as fine, fog, snow, sleet and frost, influence of the weather condition upon the adhesion between rails and wheels has been made clear and evaluated quantitatively.

著者

岩壺 卓三 越野 賢一郎 森田 篤

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.720, pp.2413-2418, 2006-08-25

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In this paper, the engineering evaluation method of the crucian fishing rods is performed. Principal component analysis and multiple regression analysis are performed to the results of the questionnaire about the performance of crucian fishing rods. As a result, the performance evaluation index "stiffness・strength", "weight", "top stop" are obtained and the performance evaluation equations of the crucian fishing rods are established. It is cleared that these equations are enough practical in the sight of degree of accuracy. Then, the design of crucian fishing rod is performed by using FE model. The design of the rod with targeted performance is become possible by solving the optimization problem setting the diameter of the rod as the design parameters and the Principal component score as the evaluation function. It is thought that these analysis methods are applied to the tailored design of fishing rod based on the sensory requirement of angler.

著者

岩壺 卓三 越野 賢一郎 森田 篤

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.72, no.720, pp.2413-2418, 2006

---

In this paper, the engineering evaluation method of the crucian fishing rods is performed. Principal component analysis and multiple regression analysis are performed to the results of the questionnaire about the performance of crucian fishing rods. As a result, the performance evaluation index "stiffness · strength", "weight", "top stop" are obtained and the performance evaluation equations of the crucian fishing rods are established. It is cleared that these equations are enough practical in the sight of degree of accuracy. Then, the design of crucian fishing rod is performed by using FE model. The design of the rod with targeted performance is become possible by solving the optimization problem setting the diameter of the rod as the design parameters and the Principal component score as the evaluation function. It is thought that these analysis methods are applied to the tailored design of fishing rod based on the sensory requirement of angler.

著者

佐藤 帆紡 川畑 共良 田中 文英 山海 嘉之

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.76, no.762, pp.227-235, 2010

参考文献数

23

被引用文献数

7 22

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In the super aged society, it is expected that from now on the physical burden to caregivers will certainly increase. Transferring care-receivers between wheelchairs and beds is one of the heaviest physical labor to caregivers. To reduce the burden of the caregivers, we introduce Robot Suit HAL, which supports and expands the physical capability of humans during the daily activities. Particularly, in this paper we develop the upper half body of the HAL to support the wearer's force at upper limbs. We built a mechanism which locks the backdrivability of the power units of the HAL to assist the movement of the wearer's upper limbs. Through the demonstration of a transferring-care task with the HAL, we confirmed that the physical load on the upper limbs of the wearer was decreased and thus the wearer's trunk inclination angle was reduced, which contributes alleviating the physical load on around the lumber spine of the caregivers as well.

著者

細谷 聡 宮地 力 岡田 守彦

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. C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.623, pp.2411-2416, 1998-07-25

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The purpose of this study was to clarify the influence of different strings on the dynamics of Japanese Bow, and to investigate the relationship between the measured mechanical data and the feeling of shooter. Four strings, aramid fiber "Kevlar", "Technora", polyester fiber "Vectran", and hemp string were used for the shooting experiment by nine subjects. At that time, feeling data through questionnaires were collected. The results were summarized as follows: (1) in the logarithmic decrement of bending and torsional oscillation after release, hemp string was highest in this four strings, (2) the difference of fibers didn't have influence on frequency of the oscillation, (3) in the energy transmission efficiency, Kevlar, Technora and Vectran were about 69%, hemp was 67.7%, (4) it is also found that the feeling of shooter was related to the measured mechanical data significantly.

著者

沢 俊行 平良 善進 白石 浩之

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.49, no.442, pp.1092-1100, 1983-06-25

被引用文献数

1

---

円形フランジ締結体に曲げ外力が作用したときの各ボルトに発生する軸力の増加分を推定する因子である曲げ内力係数を二次元弾性論および弾性床上のはり理論により解析する方法を示し、ボルト穴中心円直径が曲げ内力係数に及ぼす影響について検討している。さらにボルトに発生する曲げモーメントの影響を考慮した応力についても解析方法を示した。これらの結果を確かめるための実験を行い、両者はかなりよく一致することを示した。

著者

山本 利一 星野 孝仁

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.780, pp.3175-3183, 2011

被引用文献数

1

---

The energy supply and demand balance being very unstable in Japan today, utilization of renewable energies as alternative for fossil fuels is an important issue. In this study through experiments in wave power energy conversion teaching materials for learning were developed, interest and concern were heightened and efforts were made to bring awareness of the issues closer to home. We were able to verify the students' gaining of a deeper understanding of energy problems and grasping of energy conservation concepts through the experiments in the classroom activities. The force of the wave is converted into the motion of the steel balls and the electricity is generated. This contrivance which the steel balls move quickly even in the case of the small wave has been made the equipment. The lessons practice was carried out using this teaching tool for junior high school students. In the experiment lesson, its results verified educational effect, showing that students gained higher awareness of energy issues and also were able to effect concrete instances of energy conservation that they were able to do themselves.

著者

三宅 正二郎 秋山 幸弘 宮崎 俊行 榎本 祐嗣

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.614, pp.3586-3591, 1997-10-25

被引用文献数

3

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The tribological properties of silicon with and without water boundary lubrication with silicon, silicon carbide and a diamond tip were studied and the following results were obtained. (1) The friction coefficient between silicon and silicon or silicon carbide tips is as high as μ=0.2〜1.0, with and without lubrication. Surface damage occurred due to the adhesion between similar materials. (2) When a diamond is used as the opposite tip, the friction coefficient is as low as μ=0.09〜0.16 without lubrication. With water boundary lubrication, the friction coefficient is as low as μ=0.07. Damage is not observed on surfaces either with or without water boundary lubrication. (3) To determine the reason why sliding with the diamond tip did not result in damage, stress analysis was carried out using the boundary element method for each combination of materials. The maximum Mises stress was observed inside the silicon and diamond bulk when silicon and diamond were tested. However, the maximum Mises stress for the silicon with silicon and silicon carbide with silicon combination was observed.

著者

堤 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.74, no.746, pp.2396-2402, 2008-10-25

---

The first domestically-built mine type electric locomotive is said to be the locomotive used at the Ashio Copper Mine in Tochigi Prefecture, Kanto District. Wheel arrangement of this electric locomotive was 0-4-0, and built in 1893 by Ashio Copper Mine Works. Mechanical and electric engineer relation to this locomotive building was Mr. Kumazo Miyahara who graduated at Telegram Vocational Training School of Ministry of Communications. In addition to this locomotive, other two examples of mine type electric locomotive building are introduced. In the final section of this paper, significance of domestic building of mine type electric locomotive examples are discussed from the perspective of history of technology and mechanical engineering heritage.

著者

小野寺 英輝

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.74, no.746, pp.2371-2378, 2008-10-25

---

In Japan, western technology was rapidly introduced from the last stage of the Edo era. However, a lot of examples of technology transfer failure were included in the process. This paper deals with the cause of failure of the Kamaishi national iron mill. Lack of the domestic pig iron demand and insufficient marketing research, the Kamaishi iron mill generated large amount of deficit and was the greatest failure at that period. Analyzing several remained documents, it was understood that Japanese engineers throw large raw ore into the furnace under operation, to make it blockade. It was the simplest way to avoid further financial loss, and to conseal serious carelessness of preliminary survey. Blockage of the furnace was not the main factor of the iron mill business discontinuance, however, it had significant meaning. It was useful to minimize the initial risk of the following private enterprise, which succeeded the iron mill management. And it had big influence in iron manufacture which had grown up to the Japanese key industry in modern ages.

著者

村田 昌弥

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.52, no.476, pp.1351-1354, 1986-04-25 (Released:2008-02-21)

参考文献数

6

---

The Ladder Chart have been used to the presentation of programs on the Programable Sequence Controller (P.C.) as same as on the electric sequence circuits consisted of relaies. But, it is unsuitable method for the presentation of programs on P.C. because which involves new codes of micro computor never seen in sequnce circuits of relaies. The new description method using Boolean Algebra and the new symbols for new codes is prefered. This method gives a logical presentation and the convenience of progam coding.

著者

長谷 陽夫 芋生 明俊

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.742, pp.1617-1624, 2008-06-25

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There are no prediction methods of bearing fatigue life when ball bearing is used under the condition of contact ellipse being over shoulder. To enable this prediction there are two difficulties. The first is contact problem shifts from non-conforming contact problem to conforming contact problem because of large load. The second is there is no practical method for bearing life estimation under the condition like as edge load occurring, though there exist many decision methods about optimal crowning when edge load occurs. For each problem, authors have proposed each solution. Combining those methods, we propose the bearing life ratio estimation method under the condition of contact ellipse being over shoulder. To verify this method, we compare the calculation result with bearing life test result for 50 samples that have different 3 inner ring outer diameters. The both result agree well, therefore the validation of this method was achieved. Ahead of that, we propose improved solution to the first difficulty, and verify the contact pressure and shear stress by comparing FEA result with improved solution when contact ellipse being over shoulder. This solution has been used to estimate above-mentioned bearing life.

著者

生駒 和也 佐々木 崇 下島 隆 岩清水 幸夫

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.67, no.661, pp.2756-2762, 2001-09-25

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In order to clarify vibration characteristics of the horn and capillary system of an ultrasonic wire-bonder, measurements of resonance frequency and mode were carried out with the capillary-tip lightly pressed on simulated work pieces. The results were compared with those in the case of the capillary-tip free, obtained by the previous study, and differences caused by the contact of the capillary-tip with simulated work pieces were made clear. Present and previous results were also considered by theoretical analysis of natural vibration based on a model treating the horn and capillary as beams with tapered portions, and assuming that they were connected at one point.

著者

佐野 典秀 高橋 亮一

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.62, no.596, pp.1439-1445, 1996-04-25

被引用文献数

1

---

Human reliability in a complex system has been studied to established the complete safety by analyzing the operator's performance in a control room of a nuclear power plant. In this paper, the connection of a mathematical model with the questionnaire to the plant designers and operators resulted in proposing a fuzzy tool for evaluating the quality of the recent automated control system. The present paper method is capable of calculating human performance by summing the weighted utility of attributes ; (i) this elicits the two dominant attributes with a modified fuzzy measures learning identification algorithm (FLIER) to describe the ill-defined man-machine system, (ii) FLIER reduces a set of attributes until human tasks will be represented clearly, (iii) a change in the performance is illustrated on the two-dimensional map of the dominant attributes with a function of the automated level, (iv) the designers and the operators decided the balance of the manipulated/automated phase on the after careful face-to-face communication.

著者

馬 書根

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.593, pp.230-236, 1996-01-25

参考文献数

12

被引用文献数

3 2

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In this paper, we elucidate the standard creep movement forms (S-shaped curve) of a snake, which is the typical locomotive movement shown by snakes. Serpentine curve in the constant steady state velocity and ex-serpentine curve in the constant steady state acceleration are derived for the uniform creep locomotion of the snake, through analyzing physiologically its muscle characteristics, Muscular force is also discussed for these two types uniform locomotive curves. The results proposed here are demonstrated by computer simulation to agree with previously reported experimental results (Y. Umetani and S. Hirose, Trans. of the Society of Instrument and Control Engineers, 10-5 1974, 513-518, in Japanese).

著者

田中 裕久 大石 保徳

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.65, no.637, pp.3804-3810, 1999-09-25

被引用文献数

1

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A double cavity half toroidal contimlously variable power transmission transmits input torque through a pair of variable units and changes its speed ratio by controlling attitude angels of four power rollers. One power roller among them is controlled by a hydraulic servomechanism and the others are followed it under the control principle of equal force transmission. Synchronization of four power rollers is guaranteed by safety wires, however nonlinearities of friction force on the control pistons or pressure delay in hydraulic lines due to air mix or pipe length cause instability of the speed ratio servomechanism through the safety wires. This paper focuses the relation between the synchronization and stability of the CVT by making bond graph analyses and experiments, and shows design guidelines on the stabilization of the double cavity half toroidal CVT.

著者

小林 正幸 小西 康夫 石垣 博行

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.71, no.710, pp.2989-2995, 2005-10-25

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Support Vector Machines (SVM) are learning machines with high performance about pattern recognition. But, SVM has some parameters decided preliminarily. As these parameters vary, SVM's recognition performance severely varies. In this paper, we propose an optimizing method of SVM's parameters using Reinforcement Learning. By the proposed method, the Actor-Critic method that is a kind of reinforcement learning was used. Actor-Critic method can use continuous action space. The effectiveness of the proposed method is confirmed by a one-dimension pattern recognition simulation. And, we verify practical effectiveness of the proposed method by experiments about handwritten character recognition. As results, the recognition rate of characters increased to about 90% with parameters of SVM optimized by the proposed method.

著者

大浦 靖典 栗田 裕 松村 雄一

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.73, no.731, pp.1985-1991, 2007-07-25

被引用文献数

5

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This study examines the influence of dynamic stiffness in the contact region on disk brake squeal. The frequency of squeal becomes higher as the thrust pressure grows larger. We think the cause of this phenomenon is that the stiffness of the pad depends on thrust pressure, because the vibration characteristics of the disk and the caliper are not change by thrust pressure. Therefore, we measure the contact stiffness of the pad. The results show that the stiffness of the pad has pressure dependency. To clarify the influence of the pad stiffness on squeal, we analyze the disk-pad-caliper system as the surface contact analysis model, which combines the disk with the pad-caliper by distributed springs.

著者

佐藤 建吉

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.746, pp.2411-2417, 2008-10-25 (Released:2011-03-04)

参考文献数

9

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The father and son, Marc Isambard Brunel and Isambard Kingdom Brunel, were well known as the great engineers of England in the 19th century. They were worked in the fields of mechanical and civil engineering, which were broadly developed in the post-industrial revolution age. Marc, the father, engaged in his jobs that were relating to over twenty his patents. Isambard, the son, also engaged innovatively in the wider fields by denying the system of patent. In this paper, firstly, the engineer's spirits of the father and son have been discussed, and secondly, the above clear difference between their views on patents has been discussed. The aim of this paper is to give a chance to think how today's Japanese engineers should behave toward patents and the patent system.

著者

滝田 好宏

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.65, no.630, pp.622-629, 1999-02-25

被引用文献数

12

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This paper proposes a simple relation of the lateral guidance mechanism for automatic guided vehicles and Dual Mode Trucks, and named it SSM (Sensor Steering Mechanism). SSM consists of a guide bar and deceleration gear which reduces the bar angle to one-second. In order to demonstrate the effectiveness of this relation, this paper examines the stability of the dynamic behavior of the front wheel steering of the vehicle. These results show that there is no Iimitation of the moving speed unless without a slip of the tire. For the test, a self-standing mobile robot, reduced to a scale of one twentieth of the real car, is developed. Experimental results show that high-speed automatic moving is realized by using this relation.