铁基多孔含油固定结合面法向动态特性研究

实验研究了多孔含油材料固定结合面法向刚度和阻尼特性,运用带有调节系数的等效单自由度结合面单位面积参数识别方法对其进行识别。该方法采用相对位移法,将任意质量为m的振动系统等效为质量是Me的标准单自由度系统。方便快速地识别出结合面的单位面积刚度和阻尼系数,识别精度高。通过等效单自由度参数识别方法,分别识别了45号钢无介质结合面和铁基多孔材料(含油介质)结合面的法向刚度和阻尼系数。对比表明实验所用铁基多孔材料含油结合面法向动态特性优于45号钢无介质结合面,在相同的法向预紧力下,前者单位面积刚度增加40%左右,同时前者单位面积阻尼系数增大5-6倍。

Research on normal dynamic characteristics of oily Fe-based porous-media fixed joint interface

Experimental studied the normal stiffness and damping characteristics of oil-bearing porous-media fixed joint interface. Adopted a per unit area parameter identification method of equivalent single degree of freedom (SDOF) with an adjustment coefficient to identify the required parameters. Using the relative displacement, the method takes any vibration system with arbitrary mass m equivalent to the standards single degree of freedom system with mass Me, and identifies the stiffness and damping coefficients of joint interface conveniently and rapidly with high identification accuracy. Though the method mentioned above, the stiffness and damping is identified in the joint interface combined with 45 steel or oil-bearing porous-media respectively. By comparing the results, it is shown that the oily porous-media joint interface have the dynamic characteristics better than non-media steel ones, In the case of same pre-load, the former’s stiffness increases by about 30%, and the damping increases about 5-6 times meanwhile.