Finite element modeling of the operational interaction of the sleeve and the rod as part of the hydraulic drive

The hydraulic drive with hydrostatic guides is intended for use as part of various bench test equipment, namely: resource, vibration and destructive stands used for performance tests in the oil and gas, aerospace, military and other industries to establish the actual values of the performance indicators of various critical parts and components. A hydrostatic guide hydraulic actuator is similar in design to a conventional hydraulic actuator, but the stem located in the hydraulic actuator is mounted in the hydrostatic guides. Hydrostatic guides have low frictional power losses, can have wide bridges, and the oil used can be viscous. Hydrostatic guides ensure uniform stem movement even at the lowest speeds. Within the framework of this article, the calculation of the strength of the sleeve and the rod, which are part of the hydraulic drive with hydrostatic guides, is considered. To simulate stresses, deformations and displacements arising from the operation of the sleeve and rod, the finite element method is used, implemented by means of the ANSYS program. The data obtained as a result of modeling are in good agreement with calculations based on the known dependences of the resistance of materials, according to which the magnitude of radial stresses in a thick-walled cylinder is equal in magnitude and opposite in sign to the internal pressure on the sleeve. An assessment of the additional increase in the radius of the flow path of the assembly was also carried out. The obtained value of the joint change in the diameters of the sleeve and the rod turned out to be comparable with the tolerance for the manufacture of the inner diameter of the sleeve. However, if the sleeve is manufactured at the upper tolerance limit, an increase in lubricant consumption may occur. Therefore, a calculation was made to establish the maximum flow rate, which showed that even with the maximum clearance; the flow rate is within the normal range.