著者

島 安次郎

出版者

一般社団法人 日本機械学会

雑誌

機械學會誌 (ISSN:24331546)

巻号頁・発行日

vol.5, no.8, pp.35-66, 1903-04-21 (Released:2017-08-01)

著者

山田 篤司 平井 節生 畠中 秀人 真部 泰幸 西井 禎克

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.111, no.1072, 2008

著者

巻 俊宏 近藤 逸人 浦 環 坂巻 隆 水島 隼人 柳澤 政生

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.2008, pp._2A1-A11_1-_2A1-A11_4, 2008

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This paper proposes an innovative method to navigate an autonomous underwater vehicle (AUV) for detailed visual seafloor mapping with high positioning accuracy without using any vision-based matching. The method consists of three parts, SLAM (Simultaneous Localization And Mapping), path-planning and terrain tracking. The method was implemented in the AUV Tri-Dog 1 and a series of experiments were carried out at Tagiri vent field, Kagoshima bay in Japan. The AUV succeeded in observation of interesting features of the field including bubble plumes, bacteria mats and tube-worm colonies through 12 fully autonomous dives, totaling 29 hours duration. Finally a photomosaic covering about 3,000 square meters was created.

著者

巻 俊宏 近藤 逸人 浦 環 坂巻 隆

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.2007, pp._2A2-C01_1-_2A2-C01_4, 2007

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This paper proposes a practical navigation method for an Autonomous underwater vehicle (AUV) to carry out visual observations of seafloors, especially those of shallow vent fields. Underwater vent fields are scientifically important while their hostile environment presents a real challenge for AUVs. The method localizes the vehicle with regard to natural bubble plumes as well as artificial landmarks found by an onboard profiling sonar, based on the idea of Simultaneous localization and mapping (SLAM).The path plan is also updated in real time with regard to the position of the vehicle, the landmarks and the pre-defined waypoints. The method was implemented in the AUV "Tri-Dog 1" and a series of experiments were carried out at "Tagiri" vent area, Kagoshima bay in Japan. The AUV succeeded in observation of interesting features of the field including bubble plumes, bacteria mats and tube-worm colonies through 12 fully autonomous dives with the total time of more than 12 hours.

著者

小池 関也 見邨 康平

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 2015 (ISSN:24329509)

巻号頁・発行日

pp._A-24-1_-_A-24-10_, 2015-10-30 (Released:2017-06-19)

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The purpose of this study was to quantify the contribution of the whole-body joint torques to the generation of evaluation values during baseball batting motion, such as bat head speed and angular motion of the lower trunk in consideration of the joint torque generating mode. The whole-body segments and bat were modeled as a system of sixteen-rigid linked segments, and constraint axes of the elbow, wrist, knee and ankle joints were modeled with anatomical constraint equations in order to consider the degree of freedom (DOF) of the joint. Each hand was considered to be connected with the bat through zero DOF joint. The equation of motion with respect to the whole-body and bat was obtained by considering modelling errors, such as, residual joint force and moment, and fluctuation of segment's length. The dynamic contributions of the joint moments, motion dependent term and gravity term to the bat head speed and angular motion of the lower trunk were derived from the equation of motion for the system. Furthermore, the joint torque was divided into two components, such as eccentric torque component, which shows negative sign of its torque power, and concentric torque component, which shows positive sign of its torque power. The results obtained in this study showed that 1) motion dependent term was the great contributor to the generation of bat head speed and 2) major contributors to the generation of the bat head speed, such as concentric components of knob-side shoulder abduction torque and torso joint rotational torque were quantified by considering main generating factor of motion dependent term.

著者

反町 和則 長谷川 富市 鳴海 敬倫

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.2006, pp.51-52, 2006

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When air pushes a more viscous fluid in two parallel plates by a syringe pump, viscous fingering pattern have been observed. Water and aqueous glycerin solutions are used as Newtonian fluids. Polyacrylamide (Separan AP30) solutions and aqueous glycerin solutions adding polyacrylamide are used as non-Newtonian fluids. It was found that it showed the bifurcation of viscous fingering to be different by a kind of solution. And, it was found that the solution concentration, gap and air pressure influenced a bifurcation pattern. Furthermore, it was not found a large bifurcation pattern in dilute Polymer solution and aqueous glycerin solutions with lower concentration. Then, tip speed of bifurcation was low.

著者

反町 和則 長谷川 富市 鳴海 敬倫

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.2005, pp.81-82, 2005

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When air pushes a more viscous fluid in two parallel plates by a syringe pump, viscous fingering pattern have been observed. Water and aqueous glycerin solutions are used as Newtonian fluids, and aqueous glycerin solutions adding polyacrylamide (Separan AP30) are used as non-Newtonian fluids. It was found that it showed the bifurcation of viscous fingering to be different by a kind of solution. It was found that the solution concentration, gap and air pressure influenced a bifurcation pattern. Furthermore, viscosity and air pressure influenced tip speed of bifurcation in Newton fluid.

著者

河田 幸三

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.63, no.492, pp.204-205, 1960-01-05 (Released:2017-06-21)

著者

越塚 誠一 岡 芳明

出版者

一般社団法人 日本機械学会

雑誌

計算力学講演会講演論文集

巻号頁・発行日

vol.2001, pp.373-374, 2001

著者

中村 匡秀 松本 健一

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

巻号頁・発行日

vol.2018, 2018

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This paper addresses an issue of spontaneous software evolution, which is a modern form of software evolution observed in social coding platforms such as GitHub. In the spontaneous software evolution, feature additions and modifications of software are achieved by spontaneous proposals from individual developers, not by the request from the project manager. In this paper, we investigate project factors that can boost such spontaneous software evolution. Specifically, we first introduce a governance framework of the spontaneous evolution, inspired by a smart city execution model, and then consider relevant factors that can motivate developers to propose actions. Finally, we discuss necessary features for the governance framework from viewpoints of (1) motivation of developers, (2) individual sense of value, (3) skill and competency, and (4) characteristics, quantity, and deadline.

著者

北村 一浩

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.2012, pp._OS0905-1_-_OS0905-2_, 2012

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This paper reports the toy for educational tool about smart material applying Ti-Ni shape memory spring. The toy was made by shape memory spring, plastic bottle, weight, electrode, and battery. The shape memory spring was heated by current and the shape was recovered the original spring shape. The spring was flip up and disconnected the electrode. The weight was goes up and down continuously.

著者

石原 智男 石井 幸孝 関 英彦

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.70, no.578, pp.428-431, 1967-03-05 (Released:2017-06-21)

著者

福田 悠太 細井 裕貴 片山 雄介 渡邉 聡 津田 伸一 森 義英

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.2019, 2019

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<p>Cavitation phenomenon in automotive torque converter causes various problems such as erosion, noise and performance deterioration. In this study, the mechanisms of cavitation occurrence and its effect on the torque converter performance are discussed by experiment and numerical analysis. It is found that the inception cavitation number decreases as the speed ratio increases and is less influenced by the pump rotational speed. Since the cavitation locally occurs at the inception condition and the local minimum pressure coefficient obtained by the numerical analysis well correlates with the incipient cavitation number, the cavitation inception based on the naked-eye observation is found to be not significantly influenced by the dissolved air. On the other hand, the performance degradation is found to be strongly affected by the amount of dissolved air. Many bubbles are observed in the whole flow passage at this condition. Since the averaged pressure inside the torque converter flow passage well correlates with the gas equilibrium pressure in the high dissolved air condition, it is found that the density decrease due to the huge amount of gas bubble generation deteriorates the performance of torque converter. However, at low dissolved air condition, the above correlation does not well hold, which seems to indicate that the performance degradation is caused by the local vaporous cavitation.</p>

著者

福井

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌

巻号頁・発行日

vol.44, no.297, 1941

著者

岩波 健 浅野 浩二 佐々木 浩一

出版者

一般社団法人 日本機械学会

雑誌

交通・物流部門大会講演論文集 2002.11 (ISSN:24243175)

巻号頁・発行日

pp.169-170, 2002-12-10 (Released:2017-06-19)

被引用文献数

1 1

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To improve of the riding quality, three measures, yaw damper between cars, non linear air spring and height change of traction device (mono-link) connection was tested on the E2-1000 Shinkansen vehicle. In this paper, it is shown that the results of running tests, for example, the difference with the riding quality level of conventional and new item.

著者

細谷 和範 中尾 三徳 福島 大輝

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.2012, pp._2P1-D01_1-_2P1-D01_4, 2012

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In this research, we first investigated children's interests by questionnaires of some classroom for elementary school students. Results of questionnaires show that participants were divided into two groups who have interest in engineering (mechanism) and science (how animal and robot swim?). Then, an improved version of turtle-like robot, which has light sensors on board, was developed to fill child's interest for science and engineering. Child can lead this robot with intuitive feeling by using flashlight. This robot was also designed as line tracer along LED tube light.

著者

壽田 祐大 金田 礼人 本田 功輝 中島 康貴 山元 元司

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.2021, pp.1P2-I02, 2021

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<p>Mobile robots with both high trampling ability and low COT are required for hazard removal and disaster rescue in unstructured environments. In this paper, we present a Spider-Man inspired mobile robot that can brachiate using wires to overcome obstacles. The proposed mechanism has two wire injection mechanisms and winding mechanisms. By ejecting the two wires toward a ceiling and rewinding them, the robot can control its position and angle for brachiation. Then, by detaching one of the two wires, the robot starts brachiation and lands on a remote point. We build a prototype robot and experimentally verify that it can brachiate along the target trajectory.</p>

著者

下田 孝幸 鈴木 俊之 山田 和彦 小澤 宇志 高柳 大樹 矢ケ崎 啓 中尾 達郎 中山 大輔 足立 寛和

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2020 (ISSN:24242667)

巻号頁・発行日

pp.S19105, 2020 (Released:2021-03-25)

著者

丁 瑩娜 イスカンダル アルベルト 梅野 宜崇

出版者

一般社団法人 日本機械学会

雑誌

計算力学講演会講演論文集

巻号頁・発行日

vol.2015, pp._261-1_-_261-2_, 2015

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The sintering of nickel in the nickel and yttria-stabilized zirconia (YSZ) anode of a solid oxide full cell (SOFC) is investigated by molecular dynamics (MD) simulation. Low values of the work of separation (up to 500 mJ/m^2) between nickel and YSZ allows sliding of nickel nanoparticles. The sliding is significantly hindered when the work of separation increases up to 2500 mJ/m^2, which implies that the Ni surface diffusion and Ni(OH)_2 vaporization-deposition are supposed to be the main sintering mechanisms. Our MD simulations employing the reactive force field (ReaxFF) method indicate the possibility of the Ni(OH)_2 vaporization-deposition.

著者

ハン ビンイク 水内 郁夫

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.2012, pp._1P1-P08_1-_1P1-P08_4, 2012

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For a robot to hit a flying ping-pong ball which is rotating fast is difficult. A way is to use a ultra-high-speed camera with tens of thousand fps. In this paper, we have derived the equation of motion of a rotating ball considering forces to the ball from the air, and predict the trajectory based on the equation of motion. We have recorded several cases of a flying and rotating ping-pong ball in 500fps and 200fps, tried to predict the trajectory of each case based on the observed rotation speed and flying speed of the ball, and compared the predicted trajectories with actual trajectories to evaluate the presented prediction method. This paper also discusses the possibility of using a normal camera for trajectory prediction, based on the prediction of rotating speed from initial several frames using the equation of motion.