303 反発係数の微小変動がロッキング振動に与える影響

概要

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This investigation deals with nonlinear characteristics of rocking vibration of rigid block subjected to the horizontal harmonic excitations. Nonlinear rocking system may include minute changes of system parameters, such as friction and restitution coefficients depending on contact conditions between block structure and base, and friction force that may vary as the block moves. In this paper, how minute changes on friction coefficients and restitution coefficient affect rocking behavior will be examined for several combinations of rocking system parameters. A numerical analysis program has been developed to solve nonlinear motion equations for rocking motion of a rigid block subjected to horizontal base excitation and to be able to simulate the effect of minute changes of system parameters. Time series of friction coefficient and restitution coefficient changes are imitated by array of random numbers with normal probability distribution. Analytical results have shown that rocking responses are very sensitive to small changes of friction conditions between the block and the base. Minute changes of the restitution coefficients also make not only rocking responses but also their distribution.
一般社団法人日本機械学会の論文
2011-09-05