结合面切向接触等效黏性阻尼分形模型
发布时间：2019-01-26 12:31
【摘要】：基于MB接触分形理论、结合面切向接触阻尼耗能机理以及阻尼损耗因子的定义,建立了结合面切向接触等效黏性阻尼的分形模型及其损耗因子模型。所建模型表明,结合面切向接触等效黏性阻尼与结合面法向接触载荷、摩擦系数、材料塑性指数、结合面上的切向动态载荷幅值与法向接触载荷之比(简称切法向载荷比)、结合面分形维数以及分形粗糙度参数之间具有复杂的非线性关系,而结合面切向接触阻尼损耗因子与结合面分形维数和分形粗糙度参数无关,仅与切法向载荷比和摩擦系数有关。模型的仿真结果表明,结合面切向接触阻尼损耗因子随着切法向载荷比的增大而增大,随结合面摩擦系数的增大而减小;结合面切向接触等效黏性阻尼随着结合面法向接触载荷、摩擦系数、材料塑性指数的增大而增大,随着结合面分形粗糙度的增大而减小;结合面切向接触等效黏性阻尼随结合面分形维数的变化规律较为复杂,先随着分形维数的增大而增大,在分形维数值1.65附近出现最大值,而后随着分形维数的增大而减小。
[Abstract]:Based on the MB contact fractal theory, the fractal model and the loss factor model of tangential contact equivalent viscous damping are established by combining the energy dissipation mechanism of tangential contact and the definition of damping loss factor. The model shows that the equivalent viscous damping of tangential contact and the normal contact load, friction coefficient, material plasticity index and the ratio of the amplitude of tangential dynamic load to the normal contact load (tangential load ratio) are obtained. There is a complex nonlinear relationship between fractal dimension and fractal roughness parameter, but the tangential contact damping loss factor is independent of fractal dimension and roughness parameter. It is only related to tangential load ratio and friction coefficient. The simulation results show that the tangential contact damping loss factor increases with the increase of tangential load ratio and decreases with the increase of friction coefficient. The equivalent viscous damping of tangential contact increases with the increase of normal contact load, friction coefficient, plastic index of the material, and decreases with the increase of fractal roughness of the bonding surface. The law of the equivalent viscosity damping of tangential contact is more complex. Firstly, it increases with the increase of fractal dimension, then decreases with the increase of fractal dimension, and then decreases with the increase of fractal dimension.
【作者单位】： 太原科技大学机械工程学院;
【基金】：国家自然科学基金资助项目(51275328) 山西省自然科学基金资助项目(201601D011062)
【分类号】：O343.3
本文编号：2415484
[Abstract]:Based on the MB contact fractal theory, the fractal model and the loss factor model of tangential contact equivalent viscous damping are established by combining the energy dissipation mechanism of tangential contact and the definition of damping loss factor. The model shows that the equivalent viscous damping of tangential contact and the normal contact load, friction coefficient, material plasticity index and the ratio of the amplitude of tangential dynamic load to the normal contact load (tangential load ratio) are obtained. There is a complex nonlinear relationship between fractal dimension and fractal roughness parameter, but the tangential contact damping loss factor is independent of fractal dimension and roughness parameter. It is only related to tangential load ratio and friction coefficient. The simulation results show that the tangential contact damping loss factor increases with the increase of tangential load ratio and decreases with the increase of friction coefficient. The equivalent viscous damping of tangential contact increases with the increase of normal contact load, friction coefficient, plastic index of the material, and decreases with the increase of fractal roughness of the bonding surface. The law of the equivalent viscosity damping of tangential contact is more complex. Firstly, it increases with the increase of fractal dimension, then decreases with the increase of fractal dimension, and then decreases with the increase of fractal dimension.
【作者单位】： 太原科技大学机械工程学院;
【基金】：国家自然科学基金资助项目(51275328) 山西省自然科学基金资助项目(201601D011062)
【分类号】：O343.3
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