Search Results 1-20 of 418

  • Measurement of rotational property for a baseball in flight with acceleration sensors  [in Japanese]

    NAGAOKA Hiroyuki , OGINO Naoya , TSUBOI Kazuhiro , NODA Shigeho , HIMENO Ryutaro

    … <p>We attempt to measure the rotational characteristics of a ball in flight by using a baseball-like ball with a built-in acceleration sensor unit which consists of one three-axis sensor for low G and three sensors for High G. … Two approaches for obtaining the rotational speed and its axis of the ball from outputs of the sensors are formulated; …

    Transactions of the JSME (in Japanese), 2019

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  • Monitoring and analyzing of endmill processing with a wireless multifunctional tool holder system and servo internal information  [in Japanese]

    MATSUDA Ryo , SHINDOU Masatoshi , HIROGAKI Toshiki , AOYAMA Eiichi

    … On machining centers, such as machine tools, we have demonstrated the effectiveness of a wireless multifunctional tool holder system that can monitor physical quantities in the neighborhood of the cutting point during processing by a rotational tool. … Previously, this holder system was shown to be able to separately measure temperature and vibration acceleration. …

    Journal of the Japan Society for Abrasive Technology 63(1), 24-30, 2019

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  • Unsteady Aerodynamic Parameter Estimation for Multirotor Helicopters

    Nguyen Hung Duc , Liu Yu , Mori Koichi

    … In working towards a comprehensive mathematical model that determines unsteady aerodynamics, a quadcopter is equipped with a data acquisition system to gather flight data including acceleration, angular rates, flow angles, airspeed and rotational speed. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 62(1), 32-40, 2019

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  • SOIL CLASSIFICATION METHOD USING SCREW POINT-SOIL FRICATIVE SOUND BY SWEDISH WEIGHT SOUNDING  [in Japanese]

    SAKO Noriaki , SHIMOMURA Shuichi , KAWAMURA Masashi , SHIOKAWA Hiroyoshi , KATAOKA Shouta

    … Introduction<br> After enforcement of Housing Quality Security Acceleration Act in 2000, ground survey has been performed in housing sites which had not normally performed previously. … Model ground tests<br> We investigate influence factors on sound pressure level by model ground firstly, (1) It was confirmed that SPL values increased when rotational speed of test rod increased in the case of clayey soil, so we adopted 50 half turns per a minute which is recommended in Japanese Industrial Standard. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (743), 111-121, 2018-01

    J-STAGE  AIJ 

  • Analysis of head impacts at different helmet locations during a collision with strain gauge signals  [in Japanese]

    FUKUDA Takashi , KOIKE Sekiya , MIYAKAWA Shumpei , Fujiya Hiroto

    … Then, several collision experiments to investigate the linear and rotational accelerations acting in the head during a collision in the actual field have been conducted since 2003. … However, it is unclear how much the impact force is acting on a head itself by using an acceleration sensor. …

    The Proceedings of the Symposium on sports and human dynamics 2018(0), B-16, 2018

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  • Basic study on swing performance for footwear design  [in Japanese]

    NAKAYAMA Kazunaga , ISIKAWA Tatsuya , MORIYASU Kenta , HARANO Kenichi

    … Furthermore, the maximum value of the pelvic maximum rotational angular velocity was increased with shifting resultant center of pressure (CoP) to the pivot foot side at the end of the preparatory motion. … In the acceleration phase, increase of the maximum value of the resultant free moment obtained from both feet was effective to achieve the swing velocity.</p> …

    The Proceedings of the Symposium on sports and human dynamics 2018(0), B-15, 2018

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  • A Study on Estimation of Ground Contact, Gait Velocity and Position Using Wearable Sensor  [in Japanese]

    KONDO Akiko , ADACHI Wataru , HIROSE Kiyoshi

    … The posture information is estimated from angular velocity and acceleration by the sensor fusion algorithm using the Extended Kalman filter. … We can decide the ground contact by using the angular velocity and the posture information, and we estimated the gait velocity considering the ground contact and the rotational motion of lower thigh segment. …

    The Proceedings of the Symposium on sports and human dynamics 2018(0), A-27, 2018

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  • Study on load-carrying-characteristics of micro-spur-gear:(Influence of rotational speed and lubrication oil properties)  [in Japanese]

    TAJIMA Hiroto , TAKAHASHI Mikio , ITAGAKI Takayoshi , MAEDA Noritsugu , TAKAHASHI Hideo

    … <p>The authors carried out acceleration endurance tests under conditions of different rotational speed and different properties of lubricating oil, respectively. … The results of two tests with different rotational speeds were compared and the influence of rotational speed to load-carrying-characteristics of micro-spur-gear was examined. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), S1120303, 2018

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  • Study of Damping Methods on Sloshing Reduction of Water Tank of Live Fish Transporting Vehicle Subjected to Horizontal Excitation  [in Japanese]

    TANAKA Daiki , SHINTANI Atsuhiko , ITO Tomohiro , NAKAGAWA Chihiro , MAEDA Munekazu , HOSOI Kohei

    … <p>In this paper, we analize the characteristics of sloshing motion of water tank subjected to horizontal excitation and investigate damping methods to reduce the sloshing motion by giving rotational motion to water tank. … We perform the simulation using the acceleration input measured in case of the periodic impulse excitation experiment and in case of car's running on the road. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), G1000401, 2018

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  • Reduction of vibration response of structures to earthquake by inertial mass damper  [in Japanese]

    UEDA Masahiro , SONE Akira , MIURA Nanako

    … Adjustment was made to the acceleration response magnification of the top floor for each examination case. …

    The Proceedings of the Dynamics & Design Conference 2018(0), 223, 2018

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  • Measurement of Rotational Property for a Baseball in Flight with Acceleration Sensors  [in Japanese]

    NAGAOKA Hiroyuki , OGINO Naoya , TSUBOI Kazuhiro , NODA Shigeho , HIMENO Ryutaro

    … <p>In order to accurately and easily measure the rotational property of a ball in flight, we attempt to use a baseball with a built-in acceleration sensor unit which consists of one three-axis sensor for Low G and three sensors for High G. … Two approaches for obtaining the rotational speed and its axis of the ball from outputs of the sensors are investigated; …

    The Proceedings of the Dynamics & Design Conference 2018(0), 623, 2018

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  • Effects of Different Throwing Techniques in Judo on Rotational Acceleration of Uke's Head

    Ishikawa Yoshihisa , Anata Kenji , Hayashi Hironori , Yokoyama Takayuki , Ono Takashi , Okada Shuichi

    … <p>This study aimed to clarify the rotational acceleration of the head of an uke during tai-otoshi, seoi-nage, osoto-gari, and ouchi-gari when safe ukemi is performed. … A rotational velocity sensor was used to measure the rotational acceleration in the sagittal plane of the uke's head. …

    International Journal of Sport and Health Science 16(0), 173-179, 2018

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  • Research on Biped Locomotion Robot with Inertial Assist and Synchronous-drive on Self-excitation  [in Japanese]

    YONEDA Kan , ITO Toshiaki

    … The accelerator may be a wheel with rotational acceleration motor or a simple mass with linear acceleration drive. … This paper introduces a similar drive for inertial acceleration assist system to synchronize a self-excitation. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018(0), 2P2-K01, 2018

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  • The protective effect of carpet in indoor head traumatic accidents caused by fall  [in Japanese]

    Han Lu , Zhang Yuelin , Nakadate Hiromichi , Aomura Shigeru , Matsui Yasuhiro

    … The collision motion between thehead and the floor was reproduced by using a whole body numerical model, then theobtained mechanical response of the head was input to a finite element human head model.The posture, translational and rotational velocity before the collision, translational androtational acceleration of the heads during the collision were input. …

    The Journal of Japan Academy of Health Sciences 21(1), 36-50, 2018

    J-STAGE  Ichushi Web 

  • A study on the contact condition and the collision behaviour of a wheelset with a flat set on a roller rig  [in Japanese]

    MAKI Yasutaka , TERUMICHI Yoshiaki

    … In the bench test, the effect of the rotational speed of the wheel and the sprung mass on the vertical acceleration of an axlebox was observed. …

    Transactions of the JSME (in Japanese) 84(865), 18-00198-18-00198, 2018

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  • EVALUATION OF SHOULDER ROTATION ANGLE IN PITCHING MOTION::A 3-DIMENSIONAL ANALYSIS  [in Japanese]

    OKADA Tomoaki , WATANABE Mikihiko , NISHIMOTO Yuhi , KIMURA Takeshi , INAGAKI Katsunori

    … Injury is common in the acceleration phase of the pitching motion. … In such a complex motion, the rotational angle of the shoulder joint is affected by the position of the elbows and forearms, rendering evaluation of the rotational angle during pitching motion difficult. … the maximum and minimum rotational angles of the humerus were 190.29±1.36° (p<0.05) and 34.82±2.09° (p<0.05), respectively. …

    Journal of The Showa University Society 78(2), 135-141, 2018

    J-STAGE  Ichushi Web 

  • A study on the contact condition and the collision behaviour of a wheelset with a flat set on a roller rig  [in Japanese]

    MAKI Yasutaka , TERUMICHI Yoshiaki

    … In the bench test, the effect of the rotational speed of the wheel and the sprung mass on the vertical acceleration of an axlebox was observed. …

    Transactions of the JSME (in Japanese), 2018

    J-STAGE 

  • Effects of different throwing techniques in judo on rotational acceleration of uke's head

    Ishikawa Yoshihisa , Anata Kenji , Hayashi Hironori , Yokoyama Takayuki , Ono Takashi , Okada Shuichi

    … <p> This study aimed to clarify the rotational acceleration of the head of an uke during tai-otoshi, seoi-nage, osoto-gari, and ouchi-gari when safe ukemi is performed.</p><p> Eight judo club members of the National Institute of Technology (mean age, 17.5 ± 1.5 years; … A rotational velocity sensor was used to measure the rotational acceleration in the sagittal plane of the uke's head. …

    International Journal of Sport and Health Science, 2018

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  • Fast Slew Maneuvers for the High-Torque-Wheels BIROS Satellite

    ACQUATELLA B. Paul

    … on-board computer can only accommodate rotational acceleration commands twice per second. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 61(2), 79-86, 2018

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  • Correlation of upper limb joint load with simultaneous throwing mechanics including acceleration parameters in amateur baseball pitchers

    Kaizu Yoichi , Watanabe Hideomi , Yamaji Takehiko

    … The correlation between maximum shoulder internal torque, maximum elbow varus torque, and simultaneous kinematic parameters including joint angular acceleration and ball acceleration was investigated. … Ball acceleration had the strongest influence on shoulder internal rotational torque (standardized partial regression coefficient 0.69). … On the other hand, after MER (post-MER), the main cause was ball acceleration (r=0.745). …

    Journal of Physical Therapy Science 30(2), 223-230, 2018

    J-STAGE  Ichushi Web 

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