著者

小柳 玲乃 仰木 裕嗣

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2009, pp.401-404, 2009-12-02

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The purpose of this research is to estimate the angular velocity and direction of the rotational axis of the flying disc by a tri-axial accelerometer. A subject performed throwing by using the flying disc attached the accelerometer. The closed up release and catching point images were acquired using the high speed cameras. The angular velocity was estimated from the centrifugal and angular acceleration. Estimated angular velocity was compared to the calculated angular velocity by the high speed cameras. The angular velocity estimated by both the accelerometer and the high speed cameras were quite similar.

著者

伊藤 慎一郎

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2008, pp.181-184, 2008-11-05

被引用文献数

2

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25 world records were born in the swimming races of the 2008 Olympic Games in Beijing. The swimmer's wear rate of Lazer Racer, a drag reduction swim suit, among the gold medalists was 94%. The effectiveness of the swimsuit was quite apparent The reason of the drag reduction was to reduce the surface viscous friction drag and to reduce the projection cross-sectional area due to its compression effectiveness. Before Beijing Olympic started, expecting new records by these gold medalists with LZR Racer were calculated by dividing a race into two phases, a start & turn phase and a steady propulsive phase, on the assumption that theses gold medalists had the same swimming techniques of the previous world record holders. Although the drag reduction rate used in this calculation was modified according to one of the manufacturer announcement, each expecting new records was an approximate value of the new world records in Beijing Olympics. It was found that the speed increase effect by the swimsuit

著者

太田 憲 梅垣 浩二 室伏 広治 羅 志偉

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2009, pp.447-452, 2009-12-02

被引用文献数

1

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The motions of hammer were analyzed to understand the mechanism of acceleration using variable-length pendulum and hula-hoop model using energy pumping mechanism. The condition that makes the time derivative of the energy positive is derived as energy pumping for hammer. The condition is expressed in terms of tugging force times velocity to pump hammer energy and tangential acceleration on the handle. In this study, motions of hammer were analyzed and numerical experiments were performed to examine the validity of the theory.

著者

中岡 寛 須田 和裕 西原 明法

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2000, pp.204-208, 2000-11-08

被引用文献数

2

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For rising competition abilities, it is important to do feedback of player's characteristics in or after the game. In this study, We abstracted and resolved characteristic of movement excursion from beginners and experts. Because of feedback of movement excursion will be able to contribute to cradling of players. In the present analysis method, player's information on the position was gotten by estimation with eyes and using recorded videotape. But, these methods are not objective judge and take enormous time as it is unable to do feedback subjective information right after the game. Therefore, We carried out REAL-TIME DIFFERNCE IMAGE PROCESSING SYSTEM developed by Nishihara et al. With this trace analysis system, We estimated the position information of the actual coat of badminton players on the screen in real time. Game was arranged by separately the beginner and expert group of university students, and organized with 11 points match game. From these games, the data including time of rest period as interval of rally, work period as rally, distance of mobility and velocity of mobility were collected. In view of the analytical results in the games, it was clarified that, comparing the expert group with the beginner group, there was no difference in velocity of left-right mobility direction, but the former moved more rapidly in before-behind mobility direction than the latter. As a result of comparing between beginners' and experts' staying time at the court divided into 6×6 segments, the former stayed much longer at the left side in front of the court and the latter stayed longer at the both side in back of the court in significant. Beginners took rest period significantly longer than experts, however there was not difference during work period. Also, movement of excursion, when got and lost points, made players' weak-points obvious easily. Our study shows that this system is effective for improving competition abilities as players can get momently their characteristics of excursion after the game immediately.

著者

堀井 清之

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2003, pp.1-5, 2003-11-07

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A new methodology with liner space analysis for human performances of ingenuity and skill including sports, drawings and literary works has been developed to clarify the implicit knowledge. The implicit knowledge has contained ideas, feelings, thought processes and patterns style and so on without being clearly formulated and defined in the mind. For analysis of novels by Natsume Soseki, spiral styles were visualized. This spiral style was supported as common sense that Natsume wrote novels theoretically and logically by many researches. Miyazawa's novels were observed the wave styles, which mean his novels involve rich sensitivities. The other implicit knowledge has been also disclosed; the sports performance with high skill has been revealed.

著者

溝田 武人 黒木 耕平 大屋 裕二 岡島 厚

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2008, pp.63-64, 2008-11-05

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Less spinning soccer ball aerodynamics are studied by wind tunnel experiments. Aerodynamic force of unsteady lift and side ones acting on the ball at rest are measured and estimated flight trajectory. Well agreements of flight shift magnitude in lateral direction between observed and calculated ones are obtained. As a result, the cause of this strange behavior of the soccer ball is clarified by self-excited buffeting phenomenon of purely irregular behavior of horseshoe-shaped vortex and longitudinal twin one, which already discovered with supper critical Re number region of smooth sphere by S. Taneda(1976).

著者

森岡 賢次 高本 俊一 山本 晋平 綿貫 雅也 SALA Maximiliano 大場 昌昭 塩野谷 明

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2001, pp.38-41, 2001-11-07

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In thinking about an improvement of a performance in swimming, it is important to progress the self-propulsive force in swimming. The purpose of this study was to develop the equipment and procedure, which measured and evaluated by 3 type of swimming as follows ; Semi-tethered swimming (STS), stream swimming with water flow and STS with water flow. From the basis of these results, the mutual relations between swimming velocity, propulsive force and resistance in swimming were considered.

著者

大島 成通 梨田 裕紀 竹上 洋史 大槻 敦巳

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2009, pp.436-441, 2009-12-02

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Pole vaulting has progressed rapidly in terms of improved mechanical properties and better appearance by using poles made of flexible fiberglass material. Competitive pole vaulting requires specific characteristics that promote higher jumps. In this research, simulation analysis to optimize the joint torque, pole stiffness and pole length was done by using Genetic Algorithm. Here, the vaulter was expressed by the three-dimensional model including twisting the waist. Genetic algorithm in which the joint torques of the vaulter were expressed in terms of spline interpolating curves. From the results, it was clarified that there is optimal pole characteristic to the vaulter's initial velocity.

著者

穂苅 真樹 土岐 仁 廣瀬 圭 齋藤 剛

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2006, pp.23-26, 2006-11-08

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This paper describes a new method to measure and analyze three-dimensional rotation and translation analysis of upper limb in basketball shot form. In general, the shot form is measured by taking the photograph of motion with the high-speed camera and/or video camera and analyzing the photograph with direct linear transformation method (DLT method). The suggesting measurement method was derived by the kinematic human body model analysis. The measurement system developed by using the three dimensional rate gyro sensors set at the several body positions can measure the three dimensional rotations and the three dimensional translations of various parts of body. By using this system, the motion of a thin part such as wrists and ankles can be measured easily. In addition, this system can measure the basketball shot forms of various players correctly.

著者

瀬尾 和哉 渡部 勲 太田 香織 村上 正秀

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2001, pp.136-140, 2001-11-07

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This paper describes the aerodynamic forces acting on the ski jumper during the landing phase as well as the free flight phase. The full size model was employed to measure the lift area, the drag area and the moment volume, which was mounted in a 3-meter low speed wind tunnel. The ground effect plate was set in the test section of the wind tunnel. The clearance between the plate and the center of mass of the body-ski combination was about 1 m. It was found that the difference between the lift area with the ground effect plate and that without the ground effect plate increased with the ski-opening angle, though difference of both lift areas was independent of the angle of attack. The difference of both drag areas was small. The flight distance was estimated about 146 m, which is 6 m longer by taking account of the ground effect.

著者

塩野谷 明 畠 圭祐 篠田 崇 西條 暁里 江田 茂行

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2008, pp.281-284, 2008-11-05

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The purpose of this study was to evaluate the spike shoes for the sprint race by the parallel measurement of mechanical power of foot joint and the lower limbs muscular strength. To perform this purpose, the system for the parallel measurement of mechanical power of foot joint and the lower limbs muscular strength was developed. Furthermore, the mechanical power of subject's foot joint in wearing the high performance spike, the general competition spike and the running shoes was measured in the conditions of the plantar flexion jump (PFJ ), the counter movement jump (CMJ) and the drop jump (DJ) using the sliding seat. The experiment led us conclusions as follows; the mechanical power of the high performance spike in DJ was the highest of experimental shoes. The increasing ratio from CMJ to DJ of the high performance spike was the highest of these, too. The iEMG in wearing the high performance shoes in DJ was the lowest. The high performance spike could be output the high mechanical power in the phase of the plantar flexion.

著者

橋本 孝雄 長谷川 裕晃

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2008, pp.201-203, 2008-11-05

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In the present study, impact force measurements and biomechanical analysis were carried out during the KERI (kicking) of SHORINJI-KEMPO. The impact force and kinetic parameters were measured by using the proposed impact force measuring device with strain gages, accelerometer and three-dimensional rate gyro sensors. Furthermore, the force of pivot leg was measured by a 6 degree-of-freedom force sensor, and the movements of KERI-ASHI (moving leg during KERI motion) were measured by using accelerometer. The trained SHORTNJI-KEMPO players showed the larger impact force in contrast to that for un-trained players. The impact force was affected by the pivot leg movements. It is important to increase the impact force that the player supports the body with the toe side and the inside of the pivot leg and the body is stabilized by the large reaction force of pivot foot when the player starts the KERI motion.

著者

岩壷 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

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2004, pp.247-252, 2004-11-09

著者

渋沢 貴久 竹下 孝樹 本多 舞 松井 利一

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2007, pp.216-221, 2007-11-13

被引用文献数

2

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So far, many kinds of human two-joint arm control models with shoulder and elbow joints have been proposed to simulate human two-point reaching movements. However, in order to simulate human arm movements accurately, it is desirable that the human arm control system should be formulated as a three joint model including a wrist joint. In this research, we extend the modified minimum-torque-change model to a three joint model and incorporate a freezing mechanism into its wrist joint. Actually, the freezing system is a feedback controller to simulate the muscle dynamics contracting agonists and antagonists together. Consequently, it was clarified that the extended model can reproduce two-point reaching movement characteristics for the human three-joint arm system: the end-point variability of hand trajectories and the relationship between end-point variability and movement time (Fitts' law). This suggests that the extended model characterized by the freezing wrist joint functions effectively as a model of the human three joint arm control system.

著者

白土 男女幸 久米 雅 大西 明宏 仲井 朝美 佐藤 ひろゆき 牧 道太郎 芳田 哲也

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2007, pp.254-257, 2007-11-13

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The purpose of this study is to examine the optimum fermentation period of clay by analyzing the technical properties of daubing motion among several kinds of clay. An expert wall craftsman (right-handed male, 56 years old, 28 years of work experience) and a non-expert (right-handed male, 37 years old, 6 years of work experience) daubed on the wall using 4 kinds of clay with different fermentation period (1-day, 1-, 2-, 3-week). The shape-maintenance property of clay was evaluated by slump test. The motion of daubing was measured using a three-dimensional motion analysis system. The slump value under 1- and 2-week clay condition was higher than 1-day and 3-week. Under 1-day clay condition, speed and acceleration of the right hand (vertical direction) were lower than other conditions. Moreover, daubing motion of the expert was hardly influenced on clay condition compared with the non-expert. These results suggest that the optimum fermentation period of clay is 1 or 2 weeks.

著者

秀熊 佑哉 芳田 哲也 大西 明宏 白土 男女幸 久米 雅 仲井 朝美 柴田 勘十郎

出版者

一般社団法人日本機械学会

雑誌

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics

巻号頁・発行日

vol.2007, pp.403-406, 2007-11-13

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Kyoto bow is the Japanese traditional bow which made form 100% natural materials such as bamboo, woods and so on. Kyoto bow consists of three different parts and they were glued together, so that Kyoto bow can be regarded as hybrid adhesive composite structure. The characteristics of Kyoto bow very much depend on the materials and adhesive. The purpose of this study is to investigate the effect of the structural materials of bow on muscle activity during drawing the bow. Three kinds of bow were used in this study; 1) typical carbon bow, 2) Kyoto bows which were produced with normal bamboo, or 3) heated bamboo. The deformations of bow and muscle activities were measured during drawing the bows by using the motion capture and the electromyogram. As a result, advantage of a Kyoto bow and muscle activity during the drawing the bow were clarified.