Baryliuk E. Resource increasing of the pneumatic electromagnetic valves using the damping in the moving assembly of electromagnetic drive

This thesis is devoted to the solvation of actual problem of compact-sized pneumatic electromagnetic drives, which are widely used in aviation and space systems, resource increasing, by adding special damping in the electromagnetic dive's moving assembly. As the test subject the compact pneumatic valve with two-positioned electromagnetic drive was chosen. The work peculiarity of such valve are high dynamic loads on the valve elements during the valve operation. Those loads lead to the destruction of the elements, and limits the valve lifelentgh. The enhanced mathematical model of such valves were created. This model considers presence of buffering spring and damping units in the valve design. Using the finite elements model, which considers the peculiarities of valve design, the calculations of dynamic loads in the valve elements during the valve operation were conducted. Those calculations confirmed, that the highest loads occur in the area of rod neck of valve electromagnetic drive. Using the stochastic theory of damage accumulation in the valve units under the impulse cyclic loads during the valve operation, the mathematical dependencies were obtained. Those dependencies allow to calculate the density of distribution, and the function of distribution for the onumber of operational cycles until the critical element (rod) destruction. Those dependencies are recommended to use for the determination of the lifelength for the valve of such type. Based on the resource tests of serial valves with two-positioned polarized electromagnetic drive and rubber-metallic sealing, and metel-metallic sealing, the effectiveness of special damping usage was evaluated. The conclusion was made, that using the damping, it is possible to significantly decrease the dynamic loads on the valve elements during its operation. For the valves of such type it is about 40…50%. Original damping unit designs were created, they have utility model patent of Ukraine.