Determination of the strain-stress state of a power hydraulic cylinder in nonstationary loading mode
Relevance of the work is to improve the methods for calculating power hydraulic cylinders, necessary to increase reliability, optimize the structural design of elements and operational modes of operation of hydraulic cylinders of road, construction and carrying and lifting machines. The methods for studying the nonstationary loading modes of hydraulic cylinders are of the utmost interest.Purpose. This work is devoted to determination the patterns of deformation of the elements of a power hydraulic cylinder being in a nonstationaryloading mode. Research is conducted using a single-stage double-acting hydraulic cylinder of the jacking rail crane “Sokol 80.01” as an example. Research methods. Improving the accuracy of calculations of the dynamic interaction of hydraulic cylinder elements is ensured by reducing the number of assumptions and using numerical methods oriented to modern computers. The strain-stress state of the components of the hydraulic cylinder is determined by the finite element method in a nonlinear dynamic analysis of the Simulation medium of the SolidWorks CAD program by modelling the specified operating conditions of the hydraulic motor. The temperature regime of the hydraulic cylinder is defined in Flow Simulation SolidWorks (finite volume method).Results. The results of an analysis of a numerical study of the bearing capacity of a power hydraulic cylinder in a dynamic loading mode are presented. The numerical model takes into account: contacting options for the mating elements of the hydraulic cylinder, depending on the structural clearances of the movable joints formed as a result of technological and operational factors; a combination of longitudinal and transverse dynamic loads; nonlinear stress - strain characteristics of the material; the influence of the temperature regime of the hydraulic motor. As part of a numerical study of the hydraulic cylinder, the parameters of the distribution of stresses and equivalent deformations of the rod and cylinder liner as a function of time are determined. The authors also determined the spatial trajectory of the contact point with the highest contact voltage of the “liner - cylinder tube wall” and “piston - cylinder tube wall” coupling and the influence of the temperature regime of the hydraulic unit on the bearing capacity of the hydraulic cylinder.