The constitutive relationship between the journal and the rotor unit is simplified to a spring damper and a torsion spring damper, where the former is used to simulate the transverse bending vibration of the rotor; the latter is used for the torsional vibration of the rotor. Through the above simplified process, it can be seen that the rotor system DEM rubbing analysis model firstly abstracts the various components of the rotor system into "discs", and then uses the constitutive relationship between the disc and the disc according to its actual situation. Obtained instead. It can be seen that both the normal stiffness and the tangential stiffness are not constant, and their magnitude is related to the radius r of the contact surface.
In the process of DEM, the normal deformation of the two discs is always calculated first, and whether the two discs are in contact according to the positive and negative of the normal relative deformation (negative is not contact, is contact). Then, the normal force, the normal stiffness and the contact surface radius are obtained according to the magnitude of the deformation amount, thereby obtaining the tangential stiffness. Therefore, in the calculation process of DEM, both the normal stiffness and the tangential stiffness are quantities that change with time, so DEM well solves the nonlinear problem of such parameter changes.
The calculation of the tangential force is more complicated. It does not have a clear expression like the calculation of the normal force. Moreover, the calculation of the tangential force of the Roots water ring vacuum unit is also related to the relative motion of the disk, which is affected by the friction force. . Since the normal stiffness is a time-varying amount, the normal damping coefficient is also a variable amount in the iterative calculation process of the DEM, and needs to be recalculated in each iterative process. The tangential damping coefficient is a difficult number to determine. Its physical meaning is that when there is no macroscopic relative sliding between the two contact pads, only the microscopic deformation, the energy consumption characteristics of the two.
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