Sliding Energy Dissipation Mechanism Of The Isolated Structure And The Isolation Effect

Based on lots of correlation literatures on sliding isolation structure and energy dissipation in home and overseas., taking two-degree sliding isolation structure as an example,the law of energy dissipation under different system parameters and excitation action through great numeric analysis are discussed in this paper.The main subjects and conclusions are as follows:1,The relative energy balance equations of two-degree sliding structure are established and simplified ,then the models calculating relative energy are programmed and confirmed.2,Under single-frequency harmonic wave,the law of the input energy,the elastic vibration energy of the superstructure,the friction energy-dissipation influenced by friction coefficients and stiffness ratio ;the effect of isolation within the range of the energy resonance are all discussed.The results show that, the input energy and friction energy-dissipation are influnced by friction coefficients and stiffness ratio in the same way:both of them decrease as the stiffness ratio increases within the low frequency range ,the two indices increase as the friction coefficients increase,and out of it ,they decrease as the friction coefficients increase;the elastic vibration energy of the superstructure is immuned to the stiffness ratio and friction coefficients within the low frequency range ,but it decreases out of it; the sliding isolation is disadvantaged in the energy resonance statement.3,Under double-frequency harmonic wave,the interact of the two excitations is evaluated.It is shown that, the values of each indice increase insignificantly, but the change law of the indices is impervious when the amplitude and frequency of the first excitation are both greater than that of the second excitation;when the amplitudes of the two excitations are the same ,but the frequencies are not ,then energy resonances will happen twice as the frequency of the second excitation is equal to the first isolation frequency;it is complicated to justify how the second excitation interferes the first excitation when the amplitude of the first excitation is greater than that of the second excitation ,but its frequency is smaller than that of the second excitation.