腕の各種運動形態における手首の動特性

概要

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From the view of the human engineering, it is useful to study the torsional acceleration of the wrist under various actions of the arm Using cross-spring torsional pendulum, three kinds of torsional vibration pickup (T. V. P) of high natural frequency are made. The theoretical natural frequency f_nt of the T. V. P is as follows. f_nt=1/(2π){(32bt^3)/(WD^2l)((r^2)/(l^2)E+k_2G)・g}^1/2 in which E; the Young modulus of plate spring, G; the rigidity of plate spring, W; the weight of the pendulum of circular disc, D, the diameter of the pendulum, g; the acceleration of gravity, r; the distancc from center of the pendulum to that of plate spring, k_2 ; the shape factor of plate spring, and b,t,1; width, thickncss, length of the plate spring respectively. The experimental values of natural frequency f_nof the three kinds of T.V.P agrce very well with the theoretical ones f_nt. Under various actions of the arm, the time variations of the torsional acceleration of the wrist are obtained by the present T.V.P, Rlnd they are discussed respectively in this Paper
社団法人日本時計学会の論文
1981-03-25