| Co-Investigator(Kenkyū-buntansha) |
NISHIHARA O. Kyoto Univ. Engineering Instructor, 工学部, 助手 (00218182)
HONDA Y. Kyoto Univ. Engineering Instructor, 工学部, 助手 (60181559)
SHIBATA T. Kyoto Univ. Engineering Prof., 工学部, 教授 (40025929)
SATO S. Kyoto Univ. Engineering Prof., 工学部, 教授 (90025875)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
Skiers traversing an undulant surface control third vertical stability by bending their knees and pumping their body up and down. When the knees are bent, the legs work as passive shock absorber ; namely springs and dampers. The muscle also works as an active actuator to decrease the shock by pumping up and down the body. In this study, the leg is modeled by the hip joint, the thigh, the knee joint, the lower leg, and the ankle. joint. The equation of motion in vertical direction is formulated, and the mechanism of passive and active shock absorption is investigated. The structure and stiffness of the ski have effects on the turn. The turning mechanism is also investigated theoretically, and it is found that the distribution of the lateral force, which causes the turn is effected by the structure and stiffness of the ski.
The mathematical model of the arm, tennis racket and ball is formulated. The hand, the forearm and the upper arm are modeled by rigid body, and the joints are modeled by springs and dampers, and they can rotate and twist, and the equation of motion is formulated. The coefficients of the system are identified by the experiments using the impulse response and method of least squares. By this model, the stresses of the joints and speed of repulsion can be calculated.
In this study, method of identification of the mathematical model of human body and tools is established This can be applied to not only sptsor but also many kinds of works with tools to investigate the structure of tools and the methods of exercise.
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