足による衝撃力の測定に関する研究

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When a person jumps or falls in sports or stage performances, his feet suffer sometimes by strong impacts. The impact forces are distributed on the sole surface of foot, concentrating at a particular place. To measure the dynamic force concentration, a matrix of 36 force transducers of 3 cm square elements are manufactured, and strain amplifiers and data logger are equipped. Magnitude and acting positions of forces are calculated by the aid of microcomputer. The results are plotted on oscillograms and are also displayed by color coded three dimensional graphics, though they are not printed. Examples of measured data are shown in the cases of taking-off to jump, vertical landing, walking and standing on a single foot. Because of the shortage of strain amplifier channels, transducer matrix couldn't cover a foot wholly, so the measurement is divided into two; toe part and heel part. The surfaces of the transducers are coated by white powder before every measurement to record the relative position of a foot to matrix. The area and the peripheral condition for the experiment are strictly confined. The effect of confinement can be found on the experimental data. A typical example is a small peak at the start of oscillogram of toe part at taking-off to jump. A testee is careful to place his foot on the optimal position in the matrix, his toe and heel touches the ground at the same time. Normally a toe contacts the ground with some delay. The spectra of the load are evaluated by Fourier analysis, and it is ascertained that the measuring system has sufficient dynamic characteristic. It can be demonstrated that the state of the dynamic force concentrated on the portion around the joint of big toe and the heel.
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足による衝撃力の測定に関する研究

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