地域政策学部
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  2. Harutoshi Yukawa

Harutoshi Yukawa

  (湯川 治敏)

Profile Information

Affiliation
Professor, Faculty of Regional Policy, Aichi University
Degree
(BLANK)
(BLANK)
J-GLOBAL ID
200901051223395432
researchmap Member ID
1000194290

Research Interests

 6

Research Areas

 1

Education

 4

Papers

 84
  • Harutoshi Yukawa, Noriyuki Gyokusen, Shozo Kawamura
    The 2018 Conference of the International Sports Engineering Association. Proceedings 2018, 2, 302., 2(6), Feb, 2018  Peer-reviewed
  • YUKAWA Harutoshi, GYOKUSEN Noriyuki, KAWAMURA Shozo
    SHD, 2017 D-20, 2017  
    <p>Shock attenuation property of sports surfaces is especially important not only for the athlete's performance but also for injury prevention. To evaluate the properties of the sports surfaces, some sports governing bodies often adopt friction tests and shock attenuation tests to determine the horizontal and vertical characteristics, respectively. Although the diagonal impacts are often observed in athletic sports, shock attenuation test treats only the vertical impact test. Therefore, we developed a two-dimensional impact test device for examining the two-dimensional cushioning characteristics of sports surfaces in previous studies. To produce a simultaneous two-dimensional force against a test specimen, we incorporated a parallelogram linkage in the measuring system. The weight is dropped onto the upper side of the parallelogram linkage with various height and various initial angles. Initial angle controls the ratio of vertical/horizontal impact forces. In previous studies, FR (Force Reduction) values are calculated from experimental un-cushioned and cushioned forces for evaluating the shock attenuation properties. Additionally, to evaluate the maximum deformation during the impact, a biaxial accelerometer is attached to the sensor unit. Although FR values are simple and easy to calculate from the experimental data, it needs a vast cost because there are huge number of combinations of impact angles, magnitude of impacts and impact durations if the tests should be covered for various human activities. Therefore, in previous studies, we proposed the vertical viscoelastic model which can represent the behavior of sports surfaces during the impact for evaluating the shock attenuation properties. In this study, we propose the two-dimensional viscoelastic model of sport surfaces for evaluating the two-dimensional cushioning properties. Finally, proposed model can be used for estimating the impact forces from the experimental data.</p>
  • YUKAWA Harutoshi, GYOKUSEN Noriyuki, KAWAMURA Shozo
    DD, 2017, 2017  
    Shock attenuation property of sports surfaces is especially important not only for the athlete’s performance but also for injury prevention. To evaluate the properties of the sports surfaces, some sports governing bodies often adopt friction tests and shock attenuation tests to determine the horizontal and vertical characteristics, respectively. Although the diagonal impacts are often observed in athletic sports, shock attenuation test only treats the vertical impact test. Therefore we developed a two-dimensional impact test device for examining the two-dimensional cushioning characteristics of sports surfaces in this studies. To produce a simultaneous two-dimensional force against a test specimen, we incorporated a parallelogram linkage in the measuring system. The impact force generated was measured by the load cell. And an accelerometer was attached and the acceleration was also calculated. And experiments were performed to three kinds of different samples. In order to confirm the characteristics of the surface, the relationship between vertical and horizontal maximum force and displacement was confirmed. As the results, Hysteresis property in the vertical direction was found to depend on the hardness of the sports surfaces. However, it was found that the property in the horizontal direction is more complex than the vertical direction.
  • YUKAWA Harutoshi, GYOKUSEN Noriyuki, KAWAMURA Shozo
    SHD, 2016 B-35, 2016  
    <p>Shock attenuation property of sports surfaces is especially important not only for the athlete's performance but also for injury prevention. To evaluate the properties of the sports surfaces, some sports governing bodies often adopt friction tests and shock attenuation tests to determine the horizontal and vertical characteristics, respectively. Although the diagonal impacts are often observed in athletic sports, shock attenuation test only treats the vertical impact test. Therefore we developed a two-dimensional impact test device for examining the two-dimensional cushioning characteristics of sports surfaces in previous studies. To produce a simultaneous two-dimensional force against a test specimen, we incorporated a parallelogram linkage in the measuring system. In previous study, it was examined for hysteresis for three types of hardness samples. In this study, we improved the two dimensional impact test device and experiments were performed to three kinds of different samples. To evaluate the hysteresis properties of sports surfaces, the energy loss of each impact was calculated. As the results, Hysteresis property in the vertical direction was found to depend on the hardness of the sports surfaces. However, it was found that the hysteresis property in the horizontal direction is more complex than the vertical direction.</p>
  • 河村庄造, 湯川治敏, 平井彰, 青山新輔, 松原真己
    日本機械学会論文集, 82(834), 2016  Peer-reviewed
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Misc.

 56
  • 中島 史朗, 高橋 歩, 河辺 健太郎, 加納 裕久, 仲田 好邦, 奥本 英樹, 桑原 信治, 武田 正文, 湯川 治敏, 新井野 洋一
    地域政策学ジャーナル = Aichi University journal of regional policy studies, 7(2) 81-95, Mar, 2018  
  • KAWAMURA Shozo, SATO Kosei, AOYAMA Shinsuke, YUKAWA Harutoshi, ISE Tomohiko, MATSUBARA Masami
    SHD, 2017 A-16, 2017  
    <p>In this study, we evaluated the running motion and the physical characteristics of body under the various floor condition. We measured, firstly, the running motion under three floor conditions, i.e., the rigid floor, one mat on the floor and two mats on the floor. From the measurement results, it was confirmed that the running motion did not change significantly due to the change of floor condition. Next, we simulated the running motion based on the multi-degree-of-freedom model whose parameters were identified such as to agree with the measured running motion. As the simulation results, it was shown that the rigidity of the hip joint became bigger in the case of running on one mat or two mats compared with the case of rigid floor.</p>
  • KAWAMURA Shozo, MORI Hiroki, YUKAWA Harutoshi, NAKASHIMA Kenji, ISE Tomohiko, MATSUBARA Masami
    SHD, 2017 C-34, 2017  
    <p>In this study, an inverse dynamics analysis method considering swing leg motion was constructed only by using some wireless motion sensors.(WMS) First, it was confirmed that the acceleration data by the WMS agreed well with the one by the 3-dimensional motion analysis system. Then, the method to separate the hip joint reaction force obtained from the equation of motion of the body into the support leg and the swing leg and to identify the ground reaction force was constructed, i.e., the top down approach considering swing leg motion. For the actual running data, the ground reaction force was identified, and it was concluded that the result agreed well with the one by using the force plate. The method constructed in this study, therefore, is concluded to be applicable for the actual application.</p>
  • KAWAMURA Shozo, MORI Hiroki, YUKAWA Harutoshi, NAKASHIMA Kenji, ISE Tomohiko, MATSUBARA Masami
    SHD, 2016 A-15, 2016  
    <p>In this study, an inverse dynamics analysis method was constructed only by using some wireless motion sensors.(WMS) First, it was confirmed that the acceleration data by the WMS agreed well with the one by the 3-dimensional motion analysis system. Then, the method to estimate the contact period between the foot and ground was constructed by using the vertical acceleration data of the body. Moreover, the method to identify the ground reaction force was constructed, i.e., the top down approach. For the actual running data, the ground reaction force was identified, and it was concluded that the result agreed well with the one by using the force plate. The method constructed in this study, therefore, is concluded to be applicable for the actual application.</p>
  • YUKAWA Harutoshi, FUJIMOTO Yuta, MATSUOKA Gaku, KAWAMURA Shozo
    The Proceedings of Mechanical Engineering Congress, Japan, 2015 _J2310101--_J2310101-, 2015  
    The purpose of this study is to investigate the shock attenuation properties of long pile synthetic turf by modeling and simulation. Three types of sepecimens which have different hardness were used for comparing the shock attenuation properties. The hardness was controlled by the composite ratio of infill material, i.e. normal type specimen was formed by the sand and the rubber chip with 1:1 volume ratio, 2:1 for hard and 1:2 for soft. To identify the model parameters, multi-intensity multi-area impact test which was constructed by ten grades of impact intensities and five kinds of test feet were performed to each specimen. Although the identification accuracies were not so high, the parameter sets for the each specimen calculated from the identification could represent the differences of the specimens and simulate the FR (Force Reduction) values as shock attenuation properties against the landing impact of running. In conclusions, FR values decreased with increasing the impact duration at the same impact area and also decreased with increasing impat area at the same impact duration.
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Presentations

 30
  • KAWAMURA Shozo, SATO Kosei, AOYAMA Shinsuke, YUKAWA Harutoshi, ISE Tomohiko, MATSUBARA Masami
    SHD, 2017
    <p>In this study, we evaluated the running motion and the physical characteristics of body under the various floor condition. We measured, firstly, the running motion under three floor conditions, i.e., the rigid floor, one mat on the floor and two mats on the floor. From the measurement results, it was confirmed that the running motion did not change significantly due to the change of floor condition. Next, we simulated the running motion based on the multi-degree-of-freedom model whose parameters were identified such as to agree with the measured running motion. As the simulation results, it was shown that the rigidity of the hip joint became bigger in the case of running on one mat or two mats compared with the case of rigid floor.</p>
  • KAWAMURA Shozo, MORI Hiroki, YUKAWA Harutoshi, NAKASHIMA Kenji, ISE Tomohiko, MATSUBARA Masami
    SHD, 2017
    <p>In this study, an inverse dynamics analysis method considering swing leg motion was constructed only by using some wireless motion sensors.(WMS) First, it was confirmed that the acceleration data by the WMS agreed well with the one by the 3-dimensional motion analysis system. Then, the method to separate the hip joint reaction force obtained from the equation of motion of the body into the support leg and the swing leg and to identify the ground reaction force was constructed, i.e., the top down approach considering swing leg motion. For the actual running data, the ground reaction force was identified, and it was concluded that the result agreed well with the one by using the force plate. The method constructed in this study, therefore, is concluded to be applicable for the actual application.</p>
  • KAWAMURA Shozo, YUKAWA Harutoshi, HIRAI Akira, AOYAMA Shinsuke, MATSUBARA Masami
    Transactions of the JSME (in Japanese), 2016
    In this paper, two foot strike patterns, which are the rear foot strike (RFS) and the fore foot strike (FFS), are compared from the viewpoint of the joint moment, joint reaction force and muscle activity using the actual measurement of running for two subjects. As the results, the landing reaction force has two peaks for RFS while one peak for FFS, and the significant features can be observed in the ankle joint rather than the knee and hip joint. The joint moment of the ankle joint for RFS acts toward the dorsal flexion direction at the beginning of landing, and then toward the plantar flexion direction, while the one for FFS acts toward the plantar flexion direction during landing. The bone-on-bone force for RFS shows two peaks as similar with the landing impact force. For RFS, the Tibialis anterior much works while for FFS, the Gastrocnemius and the Soleus works much. Moreover, the differences of subject A and B are shown as the contribution of joints on the running.
  • 新井野 洋一, 湯川 治敏, 中島 史朗
    日本体育学会大会予稿集, 2014
  • SAITOU Kenji, HOSOYA Satoshi, INOUE Shin-ichi, YUKAWA Harutoshi
    SHD, 2010
    Strains of nails before and after ball-release of baseball pitch were measured with strain gauges affixed on nails of 2nd and 3rd fingers. The measurements of strains were executed during simulating ball-release of straight ball, shoot ball and slider ball pitches, and actual pitching. The characteristics of strain of nails before and after ball-release were clarified and the possibility for understanding the state between fingertip and ball was suggested.
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Professional Memberships

 6
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Major Research Projects

 10
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