Atamanov Y. Increasing the performance of pneumatic percussion by selecting rational structure and parameters

Research object: the gas-dynamic and thermodynamic processes in the air cavity stroke unit and its switching paths. Research objective: improvement of operational characteristics of shock pneumatic units at the expense of a theoretical and pilot study of working process and creation on this basis of methods of the parametrical analysis and synthesis of these units. Research methods: the analysis on the basis of imitating modeling, being guided by fundamental provisions of thermodynamics of a body of variable lot of internal transition processes, kinematic characteristics, and also quantitative and qualitative structure of energy consumption of compressed air with use of an eksergichesky method. Theoretical and practical value of the received results for machine-building branch consists in development of new pneumatic schemes of the coordinated work of a shock pneumatic cylinder with the food contour including three levels of pressure that gives the chance significantly to lower energy consumption and to eliminate defects controls of the unit peculiar to the traditional scheme. The engineering method of calculation of kinematic parasubway of shock pneumatic units with the offered schemes of management is developed. Recommendations in the form of grafiokov-nomograms at the choice of design data which provide the set dynamic and power characteristics of shock pneumatic units are received. Novelty of the received results: the universal nonlinear imitating model of working process of the shock pneumatic unit with the built-in tank in a dimensionless form with allocation of the main criteria of dynamic similarity is for the first time developed. Numerical researches of influence of structure and parameters of the shock pneumatic unit on its working process are conducted and the principles of design of the shock pneumatic unit proceeding from conditions of achievement of the most effective realization of operability of compressed air when performing shock operations are formulated. Theoretical bases of a technique of engineering calculation of kinematic and power characteristics of shock pneumatic units with the built-in tank in the form of statement and the solution of a task of the parametrical analysis and synthesis are created. Extent of approbation: chair of hydropneumoautomatic equipment and hydraulic actuator NTU "HPI", Gidroeleks corporation (Kharkov). Use area: mechanical engineering and metaluse.