DEM is different from the finite element method based on the principle of minimum potential energy variation, but is based on the most basic Newton's second law. Its basic idea can be traced back to the ancient method of force analysis, any object as a separation. To analyze, it will always be affected by the force and moment of adjacent objects. It is the deformation and movement caused by the combined force and the combined moment. This way of thinking is easy to realize on the computer, with each unit as the force. After establishing its explicit equations, according to Newton's second law and combining different constitutive relations, the differential method is used to solve and iteratively calculate. Combined with animation technology, it can visually and intuitively reflect the force of each unit in the system. Changes in mechanical parameters such as field, displacement field, and velocity field, and this method is not limited by the number of objects in the system. The model establishes the rotor system dynamics model established by DEM and its constitutive relationship between the units. The journal and the bearing, the rotor and the casing have the same constitutive force, that is, both are simplified into a pair of normal and tangential spring dampers and a tangential sliding friction. It is worth noting that the spring damper Ks-Cs and the sliding friction device are combined. When the tangential force between the two units is greater than the frictional force, a relative sliding occurs between the two units. At this time, the sliding friction device acts, and the spring damper does not work; otherwise, the spring damper acts, and the sliding friction device does not The mechanical model and its constitutive relationship function; in addition, the role of the journal and the bearing unit is considered to be unbroken when the minimum oil film gap is greater than or equal to zero or greater than a certain value.
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Sealand Mass flow meter measures the mass based on Coriolis effort. The operating principle
involves inducing a vibration of the tube through which the fluid passes. The vibration,
though not completely circular, provides the rotating reference frame that gives rise to the
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sensors monitor and analyze changes in frequency, phase shift & amplitude of the vibrating
flow tubes. The changes observed represent the mass flow rate and density of the fluid.
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Model establishes rotor system dynamics model established by DEM