著者

吉田 皓太郎 若松 栄史 岩田 剛治 久保 貴裕

出版者

一般社団法人 日本機械学会

雑誌

設計工学・システム部門講演会講演論文集 2020.30 (ISSN:24243078)

巻号頁・発行日

pp.3202, 2020 (Released:2021-06-29)

---

A method to design the function of the brassiere cup shape as developable surfaces and its developed shape using Gaussian Process Regression is proposed. A developable surface, which is generated by sweeping a straight line along a three-dimensional curve, can be seen many products such as ships, buildings, clothes, and so on. The shape has not only its aim which can be formulated but also that which cannot be formulated such as creativity. In this paper, we focus on a brassiere cup. A brassiere cup is composed of several patterns and the cup shape is designed by repeatedly making paper cup model and then checking its three-dimensional shape. For improvement of design efficiency of brassieres, such trial and error must be reduced. The difficulty of the design process is caused by the function of a brassiere cup. Its function, such as to enhance woman’s breast size, et.al., is difficult to formulate and not correlate its three-dimensional cup shape. In this paper, we aim to predict the function of brassiere cup from its cup shape for efficiency of design process of a brassiere cup. First, we formulate the cup shape as developable surface using differential geometry. Then, we proposed a method to parameterize a set of function which characterize the surface using Gaussian Process Regression. Finally, we experimented our proposed method when the evaluated value using its volume and size of the cup is given.

著者

沢田 雅 中村 雅英 鎌田 信

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 B編 (ISSN:03875016)

巻号頁・発行日

vol.51, no.471, pp.3743-3747, 1985-11-25 (Released:2008-03-28)

参考文献数

3

被引用文献数

2 2

---

For the purpose of clarifying the mechanism of rotation of Savonius rotors, ones which have two semicylindrical blades are studied experimentally. The force acting on a blade is measured in a water two tank for both cases where a rotor is at rest and rotated. The flow around a rotor is observed by using aluminum powder floating on the water surface. Although the Savonius rotor is classified into a resistance type, the lift produces the torque in a pretty wide range of angle relative to the flow.

著者

赤井 直紀 尾崎 功一

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 2015 (ISSN:24243124)

巻号頁・発行日

pp._2A2-M05_1-_2A2-M05_4, 2015-05-17 (Released:2017-06-19)

---

A SLAM (Simultaneous Localization and Mapping) problem is major in mobile robotics field about past two decades. In order to solve the problem, a camera and a LIDAR (Light Detection and Ranging) are generally used. In contrast, this paper proposes a new solution for the problem using a magnetic sensor. Our method is simple since an observation model in RBPF (Rao-Blackwellized Particle Filter)-SLAM is replaced by that of a magnetic sensor. However, magnetic sensor-based SLAM has a problem that is so narrow measurement range of the sensor. To deal with the problem, we use a heuristic method to determine surround magnetic field. We conducted experiments in actual outdoor environments including loops and verified its accuracy by using a LIDAR. Through the experiments, it was shwon that our method can close loops and build consistent maps; magnetic and geometric.

著者

城越 教夫 日高 照晃

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.64, no.624, pp.3120-3127, 1998-08-25 (Released:2008-02-26)

参考文献数

5

被引用文献数

1 1

---

It is necessary to reduce gearing backlashes and bearing clearances at planet gears for the sake of minimizing the backlash of the planetary gear system for factory automation uses. However, the reducing backlash would further cause improper load distribution to each planet gear, and it would usually not be easy to keep smooth rotation of planetary gear system. To solve this problem this study experimentally investigated the influence of eccentricity of planet gears and the assembling condition on the load distribution of planet gears and the transmission error. It has revealed that there is each appropriate method to obtain better load distribution or smaller transmission error, respectively.

著者

城越 教夫 日高 照晃 賀勢 晋司

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.66, no.646, pp.1952-1958, 2000-06-25 (Released:2008-02-26)

参考文献数

5

被引用文献数

7 7

---

Reductions of meshing and bearing clearances are requisite in design and production of small backlash planetary gears. In this case, however, there is a risk of losing proper load distribution to each planet gears, which has risk of occurrence of non-working flank load. The state of non-working flank load increases unnecessarily working flank load and gives some undesirable influences on reliability of planetary gears. To solve this problem, this paper aims to analyze quantitatively about relations between the load distribution and position deviations of planet gears. These deviations are considered to be most influential to the problem in reality. About one type of the device with 4 planet gears, 20 kinds of combination pattern of the position deviations are selected out, and the influences of backlash, reduction ratio and gear module to the above relations are clarified. Consequently, allowable position deviations to avoid the state of non-working flank load are found out for various conditions and useful materials for design are obtained.

著者

福山 雅美 渡辺 哲郎 真鍋 善暢 白戸 健

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.69, no.567, pp.462-470, 1966-04-05 (Released:2017-06-21)

著者

柄澤 秀親 篠山 英恵 石橋 之宏 酒井 哲也 新井 和吉

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 (ISSN:21879761)

巻号頁・発行日

vol.87, no.902, pp.21-00145, 2021 (Released:2021-10-25)

参考文献数

13

---

The performance of a table tennis racket is often stipulated using an unique standard for the manufacturer. However, the performance criteria for restitution characteristics still have been unclear due to lack of qualitative evaluation by each manufacturer. For metal baseball bats, a formula that can easily estimate the coefficient of restitution (COR) for the bat has been proposed. Similarly, it is important to establish a method that can control the COR at the design stage for table tennis rackets. In this study, first, to understand the restitution characteristics of the table tennis ball used in the official game, an impact test was conducted on a pseudo-rigid wall at low to high velocity. Then, for 15 types of rackets, the COR of the racket body (with and without rubber) was measured. Additionally, the natural frequency and flexural rigidity of the racket body without rubber were measured. Furthermore, these experimental data revealed relationships between the COR and both of the impact velocity and natural frequency of the racket. A formula for the COR was derived similar to that for a baseball bat, and developed by considering the flexural rigidity. The effect of rubber on the COR was also investigated. Consequently, the effects of ball’s impact velocity, racket’s natural frequency and racket’s flexural rigidity on the COR of the racket were clarified. From these results, an equation that can estimate and control the COR of the racket at the design stage was developed.

著者

深谷 淳司 相江 隆広 谷川 洋文 鶴田 隆治

出版者

一般社団法人 日本機械学会

雑誌

熱工学コンファレンス講演論文集 2019 (ISSN:2424290X)

巻号頁・発行日

pp.0136, 2019 (Released:2020-04-25)

著者

北村 孝寛 中島 康貴 生野 岳志 山本 元司

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 (ISSN:21879761)

巻号頁・発行日

vol.87, no.898, pp.20-00295, 2021 (Released:2021-06-25)

参考文献数

15

---

In order to find effective movements on an office chair for preventing back pain, the paper measures EMG (electromyogram) signal and evaluates cognitive test. Core muscles of subjects on a balance ball are measured when there are forced movement and voluntary movement of the ball. The measurements show the forced movement and discontinuity movement on the ball is more effective in the meaning of muscle activity. The paper also studies the effect of movement with the balance ball on the efficiency of office workers. This is because, even if the movement is good for preventing back pain, it is not desirable to reduce work efficiency. Two cognitive tests, addition test and flanker test, are used to investigate the efficiency of office workers when the movements with the balance ball and no movements with normal chair in the view points of work reduction rate and correct answer rate. The results show the efficiency of office workers is almost the same as the case of movements with the balance ball and no movements with normal chair. Totally the study shows effective movements on the balance ball which activate the core muscle activity efficiently. It also shows the movement does not reduce the office work efficiency.

著者

堤 一郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.746, pp.2396-2402, 2008-10-25 (Released:2011-03-04)

参考文献数

30

---

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

北野 敬祐 竹田 正樹 友野 一希 近藤 亜希子 辻内 伸好 廣瀬 圭

出版者

一般社団法人 日本機械学会

雑誌

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 2020 (ISSN:24329509)

巻号頁・発行日

pp.A-4-5, 2020 (Released:2021-06-01)

---

This paper proposes the estimation method of rotational axis in figure skating jump using inertial sensors. The estimation method of rotational axis consists of components centrifugal, tangential and gravity accelerations and relationship between angular velocity and combining angular velocity, and this method estimates the pitch and yaw angles to the sensor coordinate system from the axis coordinate system and the roll and pitch angles to global coordinate system from the sensor coordinate system. We conducted the measurement experiment the triple flip jumps and the quadruple salchow jumps by the high-level figure skater using inertial sensors, and we estimated the rotational axis in the triple flip and quadruple salchow jumps. These results indicated the change of rotational axis during jump, and we indicated the difference of characteristics by the difference in success of jump.

著者

廣瀬 圭 友野 一希 近藤 亜希子 辻内 伸好 北野 敬祐 竹田 正樹

出版者

一般社団法人 日本機械学会

雑誌

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 2020 (ISSN:24329509)

巻号頁・発行日

pp.B-8-3, 2020 (Released:2021-06-01)

---

This paper proposes the estimation method of three-dimensional rotational axis in figure skating jump by iterated Extended Kalman filter and quaternion using inertial and magnetic field sensors. This method estimates the posture information to global coordinate system from the sensor coordinate system and the posture information to rotational axis coordinate system from the sensor coordinate system using the iterated Extended Kalman filter, and the direction component represented by quaternion was estimated by using inertial and magnetic field sensors. We conducted the measurement experiment the triple flip jumps and the quadruple salchow jumps by the high-level figure skater using inertial and magnetic field sensors, and we estimated the three-dimensional rotational axis in the triple flip and quadruple salchow jumps. These results indicated the change of rotational axis during jump by the normalized vector and the projection drawing calculated by the estimated three-dimensional rotational axis, and we indicated the high reproducibility in the triple flip jumps and the difference of characteristics by the difference in success of jump in the quadruple salchow jumps.

著者

侯 培紅 茶谷 明義 放生 明廣 立矢 宏

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 A編 (ISSN:03875008)

巻号頁・発行日

vol.63, no.609, pp.997-1001, 1997-05-25 (Released:2008-02-21)

参考文献数

10

---

A method for the determination of dynamic stress-strain relation of materials by means of instrumented Charpy impact testing technique was proposed and its validity was shown by some measured examples. The dynamic strengths of steels (S55C, SCM3, SUJ2, SK3) hardened from HV340 to HV850 by heat treatment were obtained from stress-strain relations measured by the present method. As a result, it was found that the yield strength of hard steels increases roughly linearly with increasing hardness and that under dynamic loading was 20∼30% higher than that under static one. Those strengths are also found to become maximum in the vicinity of HV700.

著者

宮本 大資 梶原 逸朗 細矢 直基 西留 千晶

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:18848354)

巻号頁・発行日

vol.77, no.777, pp.1760-1771, 2011 (Released:2011-05-25)

参考文献数

11

被引用文献数

2 2

---

This paper proposes a vibration testing and health monitoring system based on an impulse response excited by a laser ablation. High power YAG pulse laser is used in this system for producing an ideal impulse force on structural surface. It is possible to measure high frequency vibration responses in this system. A health monitoring system is constructed by this vibration testing system and a damage detecting algorithm. A microscopic damage of structures can be extracted by detecting fluctuations of high frequency vibration response with the present health monitoring system. In this study, loosening of bolt tightening torques is defined as the damage of the system. The damage is detected and identified by statistical evaluations of measured frequency response data with Recognition-Taguchi method.

著者

羅 軼凡 坂本 勇人 鈴木 研 三浦 英生

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.2018, 2018

---

<p>Copper has been applied to the TSV interconnection structure used in microelectronic devices because of its excellent electrical and mechanical properties. However, the physical properties of copper thin film interconnections were found to vary drastically depending on their micro texture and this serious degradation of physical properties was caused by its high-volume ratio of porous grain boundaries and fine columnar grains. Thus, the long-term reliability of products cannot be guaranteed and it is largely dominated by the strength of grain boundaries. In this study, a highly-reliable evaluation method of the strength of a grain and a grain boundary in polycrystalline copper thin films was used to determine a relationship between the crystallinity and their effective strength by using EBSD (Electron Back-scattered Diffraction) analysis and micro tensile test system. The crystallinity of a grain and a grain boundary was quantitatively evaluated by using IQ (Image Quality) value calculated from the Kikuchi pattern obtained from the EBSD analysis. And the strength of a grain and a grain boundary in polycrystalline copper thin films was evaluated by using the developed micro tensile test. Finally, it was found that there was a strong crystallinity dependence of the strength of a copper grain in electroplated copper thin films. In particular, the critical resolved shear stress (CRSS) of a grain significantly decreased with the increase of the IQ value at the grain boundary.</p>

著者

佐和田 竜二 福本 功 神田 康行

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会九州支部講演論文集

巻号頁・発行日

vol.2014, pp._2D5-1_-_2D5-2_, 2014

著者

亀谷 均 堀江 克明 幸田 憲明 久間 英樹 松本 浩介 内村 和弘 小森 健一 増木 新呉 東 裕人

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

巻号頁・発行日

vol.83, no.853, pp.17-00147-17-00147, 2017

---

<p>Lower to middle tier regions of dam reservoirs often fall into the anoxic states in summer. When the anoxic state is reached, living things die, heavy metals such as manganese and iron, hydrogen sulfide and methane are eluted from mud deposited on the lakebed. Since it is not possible to release heavy metals exceeding environmental standards, an improvement of dissolved oxygen concentration in dam lakebed is required. So far, there is no system that can automatically improve the dissolved oxygen, in the lower to middle tier regions of dam lakebed. This study was carried out for developing an automatic system to improve the lakebed dissolved oxygen concentration to 6mg/L or more. The developed oxygen dissolution apparatus can diffuse a high concentration oxygen water horizontally at a rate of 1km per day. Thus, by raising and lowering this oxygen dissolution apparatus in water, a system that creates 3 - dimensional spreading of the dissolved oxygen not only to the lower tier but also to the middle tier regions was developed. The demonstration experiments, reported of the effectiveness of the system that can raise the dissolved oxygen concentration from the low oxygen-free state to the target of 10 mg / L in 5 days. Moreover, the system demonstrated its ability to automatically raise the dissolved oxygen concentration to 10mg/L in the 10m region from the bottom of lakebed.</p>

著者

フェリペ・デ・ラ ロサ 大槻 真嗣 吉田 和夫

出版者

一般社団法人 日本機械学会

雑誌

「運動と振動の制御」シンポジウム講演論文集

巻号頁・発行日

vol.2001, pp.314-317, 2001

---

This paper develops an approach for the control of the motion of a multiple-link manipulator possessing unactuated joints. A three-rigid-link arm with its shoulder joint actuated and two elbow joints unactuated is modeled as a nonlinear Affine system. The system is a case of second-order nonholonomy since the constraints at the passive joints contain terms of accelerations. In the proposed method to solve the problem of optimal positioning the control input is expressed as a general function of a Fourier basis parameter acquired by using the Ritz method; then this parameter is optimized through the application of the Newton method. Numerical simulations were carried out and tests with an experimental setting demonstrate the effectiveness of the approach.

著者

藤野 篤之

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.1, no.1, pp.12-19, 1935

---

比例中心距離式に依る標準齒車で齒數の少い場合の缺陷を補ふためには、自在中心距離式を用ゐて齒面のアンダーカッチングを避け、同時に噛合されたときの接觸率及び作用面の値が大きく又滑り比の絶對値が小さくなる様に設計することを要する。從つて優良なる齒形を削成するために最も重要なる點は、齒面とすべきインボリュート曲線部分の選定であるが、これは同時に齒底円の半径を適當に決定することを意味する。著者の命名に依るフルマーク齒車は標準ラック型カッタ又は標準ピニオン型カッタで削成する自在中心距離式のものである。標準ラック型カッタで削成する場合にあつては、組合せ毎に齒の高さが異るから工作及び實用上不便であるが、著者は標準ピニオン型カッタで削成する場合に於て、齒底円の半径を適當に定めると中心距離は前者の場合と等しく、且大齒車の齒數が或る程度を超える組合せにあつては、小齒車の齒數に関係なく齒の高さは常に全高となることを見出した。本論文は標準ピニオン型カッタで削成する自在中心距離式のフルマーク齒車に於る齒底円の半径の決定方法を主として記述し、標準ラック型カッタに依る場合をも併せて叙述したものである。

著者

藤野 篤之

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.203, pp.134-142, 1934

---

著者は標準齒車の有する各種の缺陥を補ふために比例中心距離式を捨てゝ自在中心距離式を採用し、是れをフルマーク歯車(Full-Mark Gear)と命名した。本論文に於ては此の新様式を採用した理由を明かにするため、標準齒車の諸缺陥を分析して其の主要なる原因が齒面のアンダーカッチングにあることを指摘し且つ此の現象が噛合ひに及ぼす影響を檢討した。