著者

村井 聡紀 土屋 茉由 穂苅 真樹

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.2013, pp._J231011-1-_J231011-5, 2013

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In general, bat swing analysis of baseball has adopted an optical motion capture system. It is possible to perform advanced operating analysis, but the system is not practical for large-scale, high cost and labor-consuming measurement. In this study, the trunk rotation movement in baseball bat swing was measured using a three-dimensional gyro sensor. Gyro sensor attached to the shoulder and waist, to measure the angular velocity of the vertical axis of the body. It was possible to show a rotation movement of the trunk during the bat swing similar to the DLT method. There was no significant correlation between the angular velocity of the trunk and swing speed. There was a significant positive correlation between the maximum angular velocity of the waist and maximum angular velocity of the shoulder (r = 0.66). As a result, it was to clarify the relationship of the swing speed and trunk rotation movement.

著者

平岡 史博 穂苅 真樹 渡辺 嘉二郎

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

巻号頁・発行日

vol.2003, pp.40-42, 2003

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In budou, effective hit is chiefly judged to the opponent by umpire's eyes. The shock speed of the tool going up as athlete's skill improved and judging only by umpire's eyes became difficult. As a result, the possibility of causing the misjudgment has risen. If the judging standard can be quantified, and there is a system that can easily judge effective hit, it can use not only the misjudgment prevention but also to practice shock, and is useful for a further improvement of the skill. The judgment method of assuming sports chanbara to be an example in the main discourse and using the gyro sensor and the system that had achieved it were constructed. Moreover, the validity of the effective hit judgment system that achieved it was verified by the experiment.

著者

村井 聡紀 土屋 茉由 穂苅 真樹

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2013 (ISSN:24242667)

巻号頁・発行日

pp._J231011-1-_J231011-5, 2013-09-08 (Released:2017-06-19)

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In general, bat swing analysis of baseball has adopted an optical motion capture system. It is possible to perform advanced operating analysis, but the system is not practical for large-scale, high cost and labor-consuming measurement. In this study, the trunk rotation movement in baseball bat swing was measured using a three-dimensional gyro sensor. Gyro sensor attached to the shoulder and waist, to measure the angular velocity of the vertical axis of the body. It was possible to show a rotation movement of the trunk during the bat swing similar to the DLT method. There was no significant correlation between the angular velocity of the trunk and swing speed. There was a significant positive correlation between the maximum angular velocity of the waist and maximum angular velocity of the shoulder (r = 0.66). As a result, it was to clarify the relationship of the swing speed and trunk rotation movement.

著者

穂苅 真樹 沖 俊典

出版者

日本スポーツ産業学会

雑誌

スポーツ産業学研究 (ISSN:13430688)

巻号頁・発行日

vol.25, no.1, pp.1_89-1_95, 2015 (Released:2015-05-27)

参考文献数

8

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In this paper, we propose a system to transmit the warning information by the sound of a sport for the deaf and hard hearing. The proposed system consists of following five elements: (a) a capacitor microphone for measuring a sound, (b) a biquad filter circuit for extracting only a warning sound, (c) a V-F conversion circuit, (d) a F-V conversion circuit, and (e) a vibration sensor. The following results were obtained in the experiment. In order to extract only the signal component of a whistle from a measurement signal, the biquad filter circuit was used, and its usefulness was shown. As a result of carrying out V-F conversion of the signal component of a whistle, it was confirmed that the fixed pulse wave corresponding to the frequency of a whistle was output. When the output signal from the V-F conversion was converted to F-V, the vibration sensor operated with an output signal (voltage) proportional to the number of pulses. The frequency of the sound emitted from a whistle depends on the structure of the whistle (e.g. whistles containing a cork). Furthermore, the size of field differs according to sporting events. Therefore, it is necessary to modulate the gain (sensitivity) of a signal by adjusting a resistor and a capacitor used on the biquad filter circuit in such an environment. The system can be adjusted by using a potentiometer and a trimmer capacitor.

著者

穂苅 真樹 村井 聡紀

出版者

日本設備管理学会

雑誌

日本設備管理学会誌 (ISSN:09155023)

巻号頁・発行日

vol.24, no.2, pp.77-83, 2012-07

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

穂苅 真樹

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.784, pp.4502-4509, 2011 (Released:2011-12-25)

参考文献数

18

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The authors proposed a security system that could detect two or more theft events ((a) opening a lock, (b) opening a hood, (c) opening a trunk, (d) picking and (e) opening a door) of a vehicle using car speakers. Two or more theft events were distinguished by using the amplitude of the sound. However, this method may be affected by the surrounding environmental sounds. In this paper, the author proposes a new method using sound frequencies to determine theft events. First, the noise in the measurement signal was reduced by wavelet shrinkage. The signal of almost events was able to be detected. To investigate the frequency of each event signal, fast fourier transform was performed. In two or more theft events, there was a difference in the frequency elements. Finally, neural network was used to provide relation between frequency elements and five events. As a result, the method proposed is able to distinguish between the five events. The proposed method was verified experimentally that it is possible to determine some of the theft event.