機(jī)床地腳低速滑動(dòng)界面法向剛度分形模型及試驗(yàn)驗(yàn)證
[Abstract]:The contact deformation at the top of an elastic microconvex is constructed according to the average contact pressure. The critical mean pressure of the initial yield of the microconvex is calculated taking into account the dynamic friction coefficient. Using the power spectral density function with undamped natural angular frequency as independent variable, the theory and test method of identifying fractal dimension and characteristic length of interface are given. The simulation results show that the critical mean pressure of initial yield of microconvex body decreases with the increase of dynamic friction coefficient, and the expansion factor of fractal region decreases with the increase of fractal dimension. The maximum bonding area of microconvex body decreases linearly with the increase of fractal dimension; with the increase of dynamic friction coefficient, the normal contact stiffness will be attenuated by the area ratio and characteristic length; the normal contact stiffness will decrease with fractal dimension, and the ratio of contact area will decrease with the increase of dynamic friction coefficient. The normal contact load or the maximum bonding area of the microconvex body is increased. The identification results of normal contact parameters of interface are proved by finite element simulation. The dynamic flexibility obtained by the finite element model considering interface parameters is consistent with the experimental data.
【作者單位】: 三峽大學(xué)機(jī)械與動(dòng)力學(xué)院;
【基金】:國家自然科學(xué)基金(51275273,51605255) 2016年三峽大學(xué)研究生科研創(chuàng)新基金(SDYC2016033)資助項(xiàng)目
【分類號(hào)】:O34;TG502.14
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