研究者業績
基本情報
研究キーワード
6研究分野
1学歴
4-
- 1995年
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- 1995年
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- 1985年
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- 1985年
論文
84-
愛知大学体育学論叢 6 19-26 1997年
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スポーツ産業学研究 7(1) 19-28 1997年 査読有りAccording to our previous studies, landing shock loads are well identified by using the vscoelastic model with nonlinear unsymmetrical viscosity. Using this model, variability of landing shock loads is represented on the model parameters . To consider the variability in different running velocities, we measured 60 landing shock loads during steady pace running at three different velocities, 3m/s, 4m/s and 5m/s . The results are summarized as follows: (1) a large variability in the model parameters and the force sequence produced by each element was observed in spite of small variability of landing shock loads, but there was also observed an independency between the large variabilities, (2) a large variability of the lower masses and that of the impulse produced by nonlinear unsymmetrical viscosity and a nonlinear elastic element was observed in 3m/s running.
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スポ産 6(2) 1-8 1996年 査読有りBrain injuries during sports activity are caused by percussion which involves collision to the head. Constructing a protective environment for such collisions is one of the most important problems in biomechanical research. In this investigation, we calculated the impact force to the head with computer simulation, and evaluated the limitation speed for perpendicular and oblique impact to sports fence. From the evaluations, we suggested that safety is not always higher when the shock absorption is higher. There is a moderate capacity of the shock absorption.
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日本機械学会論文集(C編) 61(587) 2862-2868 1995年7月 査読有りThe purpose of this study is to propose a viscoelastic model of landing shock load during running at a steady pace. The vertical components of landing shock loads are measured by force platform under various running speeds in the range of 2.54 m/s to 5.68 m/s. A unique set of parameters of the model for each trial is computed by nonlinear programming, minimizing the sum of the relative standard error of landing shock load and the relative error of rebound velocity. The results are summarized as follows : (1) The viscoelastic model with variable mass proposed in this study can estimate accurately not only the landing shock load but also the rebound velocity. (2) Nonlinear unsymmetrical viscosity behaves as an active element because of its minus viscosity in the restore phase.
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日本機械学会論文集(C編) 60(573) 1569-1574 1994年5月 査読有りPurpose of this study is to propose a identification technique of nonlinear viscoelastic model considering the continuous unsymmetrical viscosity through the change of direction and magnitude of the deformation velocity of viscous element. In this paper, the model is represented by the nonlinear Voigt model which is composed of both polynomials of the viscous element and elastic element. For such a characteristics of the viscosity to be realized, the following property is employed : the sign of odd-order terms contained in the polynomial of viscous element depends on the direction of deformation velocity, and that of even-order terms does not. By comparing the identification accuracy of transient response of this model with those of symmetrical viscosity model and discontinuous unsymmetrical viscosity model by relative standard error, this model was evaluated as valid for a wide intensity range of shock loads.
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日本機械学会論文集(C編) 60(573) 1561-1568 1994年5月 査読有りThe purpose of this study is to propose a technique for the identification of nonlinear system which has particularly high nonlinear viscous characteristics such as rubber and to simulate the transient response through a wide range of impact intensities. In this paper, the system is represented by a nonlinear Voigt model composed of nonlinear viscous element and nonlinear elastic element both forming polynomials. Objective data are obtained by taking repeated measurements using the multiintensity impact test for object identification. Using the accumulated data, the system parameters are calculated by multiregression analysis. The identification accuracy of the system was high when evaluated with estimated relative standard error (RSE)and mean RSE.
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日本機械学会Dynamics&Design Conference, 機械力学・計測制御講演論文集 940 69-72 1994年
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スポ産 4(1) 29-38 1994年 査読有りThe brain injury during a sports activity are caused by the percussion which involves collision to the head. To construct a protective environment for such collisions are one of the most important factors for the biomechanical problems. In this investigation, we will experiment the collision of a human head of the testee by using Judo Tatami mats within the safety limits. We propose the mathematical model which can computer simulate the experiment model which will make the reappearance of the head collision phenomenon, and also the head collision phenomenon itself by using the measurements of the impact force and the acceleration from the experiment.
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日本機械学会論文集 60(573) 1569-1574 1994年 査読有りPurpose of this study is to propose a identification technique of nonlinear viscoelastic model considering the continuous unsymmetrical viscosity through the change of direction and magnitude of the deformation velocity of viscous element. In this paper, the model is represented by the nonlinear Voigt model which is composed of both polynomials of the viscous element and elastic element. For such a characteristics of the viscosity to be realized, the following property is employed : the sign of odd-order terms contained in the polynomial of viscous element depends on the direction of deformation velocity, and that of even-order terms does not. By comparing the identification accuracy of transient response of this model with those of symmetrical viscosity model and discontinuous unsymmetrical viscosity model by relative standard error, this model was evaluated as valid for a wide intensity range of shock loads.
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日本機械学会論文集 60(573) 1561-1568 1994年 査読有りThe purpose of this study is to propose a technique for the identification of nonlinear system which has particularly high nonlinear viscous characteristics such as rubber and to simulate the transient response through a wide range of impact intensities. In this paper, the system is represented by a nonlinear Voigt model composed of nonlinear viscous element and nonlinear elastic element both forming polynomials. Objective data are obtained by taking repeated measurements using the multiintensity impact test for object identification. Using the accumulated data, the system parameters are calculated by multiregression analysis. The identification accuracy of the system was high when evaluated with estimated relative standard error (RSE)and mean RSE.
MISC
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地域政策学ジャーナル = Aichi University journal of regional policy studies 7(2) 81-95 2018年3月
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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 2017 A-16 2017年<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>
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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 2017 C-34 2017年<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>
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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 2016 A-15 2016年<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>
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年次大会 2015 _J2310101--_J2310101- 2015年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.
講演・口頭発表等
30-
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 2017年<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>
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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 2017年<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>
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日本機械学会論文集 2016年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.
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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 2010年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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