The Diameter Of A Push Joint Static And Dynamic Pressure Bearing Dynamic Characteristics Of Experimental Research

In this paper, based on the theory of radial-thrust floating ring hybrid bearing, the dynamic characteristic test for radial-thrust bearing is accomplished on the self-made test stand. All of eighteen dynamic characteristics of the tested bearing are got for the first time. The result of the test is compared with the theoretical computation and with the results of two-dimention oil film.Firstly, the time and frequency mathematical models of three-dimensional oil film are proposed. And the solution to this problem with wide adverse matrix is given. Then the testing system is designed and the test stand is remade. In the test, the static-dynamic method and the three-exciting method are used separately to measure the stiffness and the damping, the nine stiffness coefficients and the nine damping coefficients of three-dimensional oil film are obtained for the first time. Based on the testing data, the dynamic characteristic curves of the radial-thrust hybrid bearing are drawn and compared with the theoretical curves and two-dimensional results.Conclusions are drawn as follows:1. The main axial stiffness is smaller than the main radial stiffness, the main axial damping is bigger than the main radial damping.2. Intercrossed dynamic characteristics related to the axis are not equal to zero, which illustrates that the axial of radial-thrust hybrid bearing has a relationship with the radial of it.3. Intercrossed dynamic characteristics and the main dynamic characteristics are not on the same scale. The intercrossed dynamic characteristics related to the axis are smaller especially.4. The results of the test based on the model of three-dimensional oil film are closer to the results of the theoretical computation than those based on the model of two dimensions, but the differentiation is not significant at low speed.The experimental and the theoretical research lay a foundation of the further investigation of the radical-thrust hybrid bearing, especially of thepractical application for the bearing.The data and the charts in the paper can be referenced for designers.