铁基多孔含油固定结合面法向动态特性研究

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The normal stiffness and damping characteristics of a fixed joint interface with oily porous-media were studied with tests.A per unit area parameter identification method of an equivalent single degree of freedom（SDOF） joint interface with an adjustment coefficient was adopted to identify its parameters.Using the relative displacement method,a vibration system with arbitrary mass m was equivalent to a standard SDOF joint interface system with mass Me,and its stiffness and damping coefficients were recognized conveniently and rapidly with high identification accuracy.With the method mentioned above,the stiffness and damping coefficients were identified for a joint interface of 45# steel and one with oily Fe-based porous-media,respectively.By comparing the results,it was shown that the oily Fe-based porous-media joint interface has better dynamic characteristics than the 45# steel one does;in the case of the same pre-load,the former＇s stiffness increases by about 40%,and its damping increases about 5-6 times.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。