著者

櫛田 果鈴 齋藤 優里 菅原 佳城 坂間 清子 春山 純一

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference

巻号頁・発行日

vol.2018, 2018

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<p>This paper describes behavior of the jump robot which is connected by tether. The internal environment of the hole existing on the moon is not clear and is expected to be investigated. For research of the unknown environment, exploration is planned using a rover with umbilical tether connecting a mother rover near the hole. Then, it is important to study how tether influences jumping behavior of the rover. Equation of motion and differential algebraic equation is formulated by the use of Absolute Nodal Coordinate Formulation (ANCF) and multibody dynamics. Rover is regarded as two bodies with slider joint. Telescopic motion of spring expresses effect of jump. Numerical analysis reveals the relation of jumping behavior and parameters, and is compared with experimental result.</p>

著者

中川 昭夫 笠 潮 宮部 洋介 井上 昭夫

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2000, pp.349-350, 2000

被引用文献数

3

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Most of caster walkers don't have any brake mechanism. Some of them have hand grip type brake mechanisms but it is not easy for some of the users. For those users, it is desirable if there is a brake system which works only at a time of emergency like an occasion of falling down. Properties of homogeneous ER fluid is ideal because it doesn't show any shear force but it shows a large shear force when a high voltage is applied between a narrow gap but it requires a very small electric current. The caster walker equipped with the ER fluid brake was developed to increase safety of the users.

著者

井上 昭夫 笠 潮 宮部 洋介 中川 昭夫

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2000, pp.281-282, 2000

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Properties of homogeneous ER fluid comprised of liquid crystalline polysiloxane (LCS) were described. The fluid shows Newtonian flow in an electric field and far larger ER effect than heterogeneous ER fluids of particles dispersion in oil. ER brake employed the LCS ER fluid was accomplished with many contrivances in the design and set up process for preventing a fluid leak and filling the fluid completely into a narrow electrode gap. The brake showed a large torque (brake power) with very small electric consumption. A caster walker with intelligent ER brake was developed for a practical use.

著者

井上 卓見 末岡 淳男

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.644, pp.1074-1081, 2000

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The authors present a new step-by-step integration scheme by utilizing the cardinal B-splines. The new method organizes conventional implicit methods such as Newmark-&beta; method and Wilson-&theta; method and so on, and provides a simple computation procedure so that the step-by-step integration can be carried out efficiently. In addition, when we analyze a nonlinear system with discontinuity the computational acuuracy can be improved by the approximate detection of the points of discontinuity by making good use of the two-scale relation. In this paper, we formulate an algorithm of a time historical response analysis of a straight-line beam structure as an elementary example of multi-degree of freedom system besides a simple single degree of freedom system. The cardinal B-splines used here are only the ones of orders 3 and 4 but the other cardinal B-splines are also available for step-by-step integration in the same way.

著者

渋谷 恒司 中島 千重子 守屋 隆之 弓削 和也 岩本 太郎

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

巻号頁・発行日

vol.2002, 2002

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バリアフリーのため設置されている車椅子対応エスカレータは介助者が必要で, 車椅子が搭乗するまで大変時間がかかるため, エスカレータが本来備えている輸送力が大きく減退する。従来の方式はステップの中に複雑な機構を組み込んでおり, 特定のステップしか車椅子に対応していなかった。ステップの搭乗口にあるランディングプレートを可動にし, これをステップと同期して車椅子を運べば, 時間が大幅に短縮でき, 輸送力が向上する。

著者

Kuang Liuwei Ren Liang Jing Linzhi Wen Bang Liu Huarong

出版者

一般社団法人 日本機械学会

雑誌

Proceedings of the ... International Conference on Nuclear Engineering. Book of abstracts : ICONE

巻号頁・発行日

vol.2015, pp._ICONE23-1-_ICONE23-1, 2015

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The significance and development status were introduced about the pneumatic leak test pressure tightness for irradiated fuel rods in this paper, the pneumatic leak test was conducted, and the track mediator and experiment pressure of the pneumatic leak test were defined for irradiated fuel rods. With the consideration of the factors such as sealing, fixing operation, leakage monitoring system, tracer medium and pressure of the irradiated fuel rods in hot cell, the pneumatic leak test device was designed and the gas tightness inside and outside the hot cell was verified. Through the pneumatic leak test for the artificial simulative fuel rods, the effectiveness of the pneumatic leak test device as well as the feasibility of the method were proved, the requirements of pneumatic leak test were met, the technique of pneumatic leak test for irradiated fuel rods was established, the pneumatic leak test for irradiated fuel rods under strong radioactive environment was realized, and the leakage condition and position data of irradiated fuel rods were acquired.

著者

廣瀬 圭 岩渕 琢磨 千葉 遥 近藤 亜希子

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 2017 (ISSN:24329509)

巻号頁・発行日

pp.A-33, 2017 (Released:2018-05-25)

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This paper proposes the estimation method of seating face geometry using belt-shaped inertial sensors system. This method uses the sensor fusion for posture estimation and the forward kinematics for position calculation. The sensor fusion estimates the Roll and Pitch angles using gyro sensor and acceleration sensor outputs, and the effect of drift error is reduced. The estimated geometry information is validated using the calibration device designed by CAD, the results indicated the effective accuracy. Furthermore, we conducted the measurement experiment using three sensor systems in dynamic condition. The results indicated the face geometry in settling and floating conditions. This system can be used to represent the face geometry in static and dynamic conditions.

著者

川名 優孝 刑部 真弘 平沼 賢次 丸野 文弥 木船 弘康 本田 裕一 市ケ谷 公正 西田 一成

出版者

一般社団法人 日本機械学会

雑誌

動力・エネルギー技術の最前線講演論文集 : シンポジウム

巻号頁・発行日

vol.2013, pp.231-232, 2013

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This paper describes on the energy saving using ocean, and power management using ship at time of the disaster. Yokohama Green Valley is a concept for purpose of CO2 reduction and revitalization of the economy, using the city coastal area as a model In order to realize this concept model, we performed experiment at Yokohama Hakkeijima. Experiments were performed following concretely 1 Introduction of seawater heat pump. 2. Power supply from the ship in emergency. 3. Visualization of power. The seawater heat pump, we have energy-saving 20% cut off of power. We found that the power of ship to land is an effective method in emergency. In energy saving by smart meters, we found that there is an economic benefit to reduce the basic charge of power.

著者

大森 隆広 碓井 隆 渡部 一雄 グェン ミンジュン 下山 勲

出版者

一般社団法人 日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2017, pp.I-4, 2017

被引用文献数

1

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Among the many types of sensors for measuring vibration, the AE sensor is designed to measure acoustic emission, i.e., small-amplitude vibration. Most AE sensors use piezoelectric material as transducers. Compared with the piezoelectric sensors, MEMS sensors have beneficial characteristics such as low cost attributable to mass production and smaller size. The SA sensor is a type of MEMS sensor and has broad frequency bandwidth. Exploiting this characteristic, the SA sensor can be used as a multifunctional vibration sensor to measure several frequency ranges conventionally measured by multiple sensors. In this paper, PLB test results measured by SA and AE sensors are evaluated by wavelet transform to investigate the applicability of the SA sensor for AE measurement.

著者

高畑 智之 渡辺 諒 グェン ミンジューン 高橋 英俊 松本 潔 下山 勲

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

巻号頁・発行日

vol.2015, pp._C-8-1_-_C-8-4_, 2015

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We propose a precise altitude change measurement method by sensor fusion of sensitive pressure change sensor, which is based on MEMS differential pressure sensor, and commonly used pressure sensor. Precision of the fused pressure measurement was as high as 0.1 Pa. We measured the pressure change during walking up stairs.

著者

安永 竣 グェン ミン ジューン 髙畑 智之 下山 勲

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

巻号頁・発行日

vol.2017, pp.1A1-K07, 2017

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<p>In this paper, we developed a method of measuring altitude using a MEMS differential pressure sensor (DPS) with a cavity, for an unmanned aerial vehicle (UAV). The method includes modeling of DPS and prevention of the influence by the wind. Firstly, we built a transfer function model of the DPS and measured two parameters required for calculating altitude. The parameters were obtained with two experiments: applying static and dynamic pressure onto the both side of the DPS. Secondly, we developed on the basis of fluid dynamics a shielding cap which protects the sensor chip from direct wind caused by the propellers on a UAV, while keeping it to pursue the static pressure. The most sufficient cap, which is spherical with holes at a specific angle to the wind axis, removed both noise and the dynamic pressure.</p>

著者

田辺 郁男 ジュニオール ライムンド ダ クルス イエー トット ソー 富岡 恭平 高橋 智

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.79, no.799, pp.748-758, 2013 (Released:2013-03-25)

参考文献数

16

被引用文献数

2 2

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In the 21st century, as it is important to produce products with care for protecting the earth, a producer must be careful to conserve energy, save resources and reduce waste which pollutes environment. On the other hand, in case of a drilling, much cutting oil was also used for lubrication and cooling. This is large problem for protecting the earth. Therefore drilling technology using strong alkali water with micro-bubble was developed. A drill with through hole was used for this technology. Cooling effect of strong alkali water with micro-bubble was firstly investigated on the experiment. Then heat transfer coefficient of the drill with through hole was evaluted for cooling capacity. Tool life of the drill using strong alkali water with micro-bubble was also evaluated in the experiment of drilling using Ti6Al4V which has small thermal conductivity and is a material with difficult machining. It is concluded from the results that; (1) Cooling of strong alkali water with micro-bubble was very effectuive, (2) Heat transfer coefficient of the drill using strong alkali water with micro-bubble was 3.5 times of that of dry drilling, (3) Tool life of the drill using strong alkali water with micro-bubble was 6.5 times of that of dry drilling and 2 times of that of ordinary wet drilling respectively, (4) The drilling using strong alkali water with micro-bubble was economical and eco-friendly.

著者

谷 泰弘 金 泰元 澤山 翔 蔦中 孝丞 山口 幸男 佐藤 康治

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.453-458, 2010

参考文献数

5

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In order to reduce the costs in wheel manufacturing and on usage of the wheels, we investigated the method of adjusting the sharpness of grinding wheels by using heat treatment and UV treatment. At first it was confirmed that heat treatment of phenol resin grinding wheels for aluminum in a furnace enabled to improve the grindability of stainless steel and to prevent swarf loading. Next it was made clear that surface treatment of grinding wheels by using UV irradiation and hot air blowing had the similar effect with the heat treatment in a furnace. These treatments reduced the force ratio in surface grinding. In these cases the affected layer was limited to the wheel surface though heat treatment in a furnace affected the whole wheel. The thickness of the layer varied with the UV irradiation time. At last we applied this technique to other resinbond wheels and the same effect was obtained for the wheels with polyester bond. However heat treatment did not improve the grindability of epoxy bond wheels with high heat resistance. In such case UV treatment was an effective method to activate flow-out of swarf.

著者

原田 研介 パク ジョンフン 金子 真

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

巻号頁・発行日

vol.2001, 2001

著者

篠田 忠夫

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:00214728)

巻号頁・発行日

vol.67, no.549, pp.1517-1523, 1964

著者

竹村 勘悟

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.46, no.320, pp.739-740, 1943-11-30 (Released:2017-06-21)

著者

片岡 健太 吹場 活佳 平田 邦夫

出版者

一般社団法人 日本機械学会

雑誌

動力・エネルギー技術の最前線講演論文集 : シンポジウム

巻号頁・発行日

vol.2014, pp.5-8, 2014

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It is necessary for thermal power plant to achieve high heat efficiency and to use an alternative energy source because of global warming and exhaustion of fossil fuels. Heat efficiency of latest thermal power plants reaches to 60% and researches to achieve more high heat efficiency are done, for example, rising burning temperature and pressure ratio. However these measures can improve heat efficiency only few points. In this study, we try to get jumping raise of heat efficiency by reducing compression work of air compressor. To reduce compression work, we devise new system which liquefies air by using cool heat of liquid hydrogen and we propose to use liquid oxygen as the oxidizer. In this paper, we explain about this new system and calculated results which reaches 73% of heat efficiency.

著者

NGUYEN QUANG Thinh 岩村 幸治 杉村 延広 浦出 俊和 竹歳 一紀 香川 文庸 平原 嘉幸 木下 泰宏

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 (ISSN:21879761)

巻号頁・発行日

pp.18-00220, (Released:2019-02-26)

参考文献数

17

被引用文献数

1

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Much emphasis is now being given to research and development of plant factories which daily produce a large volume of high-quality vegetables under artificially controlled environments. One of the important issues to be considered for the management and the daily operations of the plant factories is to find a set of suitable customers and/or markets to which the daily produced vegetables are sold and delivered. The current wholesale markets of the vegetables are not suitable for trading the high-quality vegetables produced by the plant factories, therefore, a new market is required to sell and to buy the products made by the plant factories. A new trading market system is proposed, to sell and to buy the lettuces supplied by the plant factories, based on the stock exchange mechanisms, in this paper. An estimation method of yield rate is also proposed to generate a suitable volume of sales for the plant factories. Some case studies have been carried out to verify the effectiveness of the proposed trading market.

著者

石山 達也 戸谷 剛 永田 晴紀 稲場 康彦 井上 遼太 佐々木 俊也 寺川 健 桧物 恒太郎 李 尚駿 金井 竜一朗 脇田 督司

出版者

一般社団法人 日本機械学会

雑誌

年次大会

巻号頁・発行日

vol.2012, pp._S192023-1-_S192023-5, 2012

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Although many groups are developing Cansat, a can-sized mock satellite, they have few opportunities to test due to difficulties for students to launch Cansats domestically. To provide the chance to launch Cansats, the authors downsized CAMUI type hybrid rocket and created easy-to-use launch system. The new launcher, miniCAMUI, uses gas oxygen (GOX) as oxidizer and high density polyethylene as fuel. Using GOX instead of liquid oxygen contributes to downsizing and weight saving, reduction of turnaround time for launch due to the simplified procedure to fill the oxidizer. A GOX tank connects to a motor through a valve. An air-driven actuator operates the valve miniCAMUI was launched 6 times in June and July 2012. Three of them were serial successful launches with two rockets in a day, with a turnaround time about 45 minutes. Two of the three launches were with the same rocket in the day. With the wind velocity of 1 to 2 m/s, the apogee altitude was about 74 m, being very close to the predetermined altitude of 80 m. This result shows that miniCAMUI was successfully developed as a small launch system with high operability. miniCAMUI is available for launches to various altitudes below 250 m.

著者

田中 啓介 鈴木 健太 藤井 貴之 渋江 隆治 藤山 一成

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:18848338)

巻号頁・発行日

vol.79, no.799, pp.266-280, 2013 (Released:2013-03-25)

参考文献数

14

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Fatigue crack propagation tests of center-notched plates of lead-free solder were conducted under displacement-controlled conditions with mean strain and load-controlled conditions with mean stress. The J-integral range was evaluated from load-displacement curves by using the simple estimate method. The mean stress introduced by the initial (mean) tensile strain in displacement-controlled tests was relaxed very quickly with cycles. The crack propagation rate was nearly constant during crack extension and was not much influenced by the mean strain. The crack closure did not take place under tensile mean strains, while it occurred under compressive strains. In load-controlled tests with mean stress, the ratcheting deformation was accumulated during fatigue tests. The crack propagation rate increased with crack length, and was not influenced by the tensile mean stress. The crack propagation rate was lower as the mean compressive stress was larger and as the stress range was lower. The crack closure took place only for the cases of compressive mean stresses. When the J-integral range was evaluated by taking into account of crack closure, the crack propagation rate was expressed as a power function of the J-integral range for all cases examined, The effective fractions of the applied load, strain and J-integral were unity for zero and positive mean stresses. They deceased linearly with increasing mean compressive stress down to -4 MPa, and remained nearly constant below -4 MPa.