The working process and regularities of the functioning of vibrating and vibro-impact machines based on hydroimpulse drive with a singlestage valve pulser are analyzed. The essential characteristics determining the conditions for the excitation and existence of periodic oscillations of the valve-pulser shut-off valve are determined. Using the criterion of A. Hurwitz, based on the differential equation of motion, the existence of undamped periodic oscillations of the valve-pulser shut-off valve is analytically justified.
Słowa kluczowe: stability, oscillations, valve pulser, hydraulic impulse.
Przeanalizowano działanie i regularność pracy maszyn wibracyjnych oraz maszyn poddawanych wibracjom opartych na napędzie hydro-impulsowym z jednostopniowym zaworem impulsowym. Określono podstawowe cechy wpływające na warunki wzbudzenia oraz występowania drgań okresowych zaworu impulsowego. Przy zastosowaniu kryterium A. Hurwitza, opartego na równaniu różniczkowym ruchu, istnienie nietłumionych drgań okresowych zaworu impulsowego jest analitycznie uzasadnione.
Keywords: stabilność, oscylacje, zawór impulsowy, impuls hydrauliczny.
For realization of the most effective modes vibrating influence on the processed materials and the environment is perspective vibrating (VM) and vibro-impact machines (VIM) with hydroimpulse drive (HID) . The main part of the HID is pressure pulse generator, or valve-pulser (VP) , which provides control the operation mode of the vibrating machine. Experimental data and practice operating of hydraulic components VM and VIM, controlled by valve-pulsators, show, that under certain conditions in dynamic system stable self-oscillation processes are excited. Therefore, it is important in the theoretical and applied aspects explore the conditions of excitation and the existence of selfoscillations. These issues have particular importance when developing rational constructions of hydraulic VM and VIM. The paper  presents the results of the research of pressure and lateral exertion on the piston valve. The obtained results are based on the equation Reynolds and equation Navier-Stokes, are compared with variations in the aspect ratio, cross-sectional area. This research purpose is to justify the use of the equation Reynolds for the analysis operating of the piston valve during cavitation. But application the equation Reynolds and equation Navier- Stokes does not allow the develop clear analytical criteria for determine the conditions for the work stability of the piston VP. In work  the static and dynamic behavior of the pressure control valve with nonlinear negative characteristics is investigated. This pressure regulating valve has the property of both reducing and increasing the pressure at the outlet and actuated by a solenoid. The presented model and linear analysis explains the negative spring constant force in the low-frequency range. The fluctuations of this pressure control valve are based on the principle excitatory force, but the operation of the VP, constructively based on the principle feedback on pressure. [...]
 Iskovych-Lototsky R. D., Ivanchuk Y. V., Vibrating and vibro-impact devices for unloading vehicles, UNIVERSUM, 2012  Iskovych-Lototsky R. D., Zelinska O. V., Ivanchuk Y. V., Veselovska N. R., Development of the evaluation model of technological parameters of shaping workpieces from powder materials, Eastern-European Journal of Enterprise Technologies. Engineering technological systems, 1 (2017), n.85, 9-17  Sung-Ho H., Kyung-Woong K., The validity of the Reynolds equation in spool valve analysis considering cavitation, Friction, 4 (2016), n.3, 266-276  Alessandro D., Modelling and experimental validation of a nonlinear proportional solenoid pressure control valve, International Journal of Fluid Power, 17 (2016), 90-101  Feng R., Xinhui L., Jinshi C., Ping Z., Boliang L., Qinmeng W., Dynamic Characteristics Analysis of Power Shift Control Valve, Advances in Mechanical Engineering, 6 (2015), 1-7  Iskovych-Lototsky R. D., Ivanchuk Y. V., Veselovsky Y. P., Simulation of working processes in the pyrolysis plant for waste recycling, Eastern-European Journal of Enterprise Technologies. Energy-saving technologies and equipment, 1 (2016), n.8(79), 11- 20  Cheng C., Chen Z., Shi H., Liu Z., Xiong Y., System-Level Coupled Modeling of Piezoelectric Vibration Energy Harvesting Systems by Joint Finite Element and Circuit Analysis, Shock and Vibration, (2016), 1-9  Deli W., Wei X., Xudong G., Haiqing P., Response analysis of nonlinear vibro-impact system coupled with viscoelastic force under colored noise excitations, International Journal of Non-Linear Mechanics, 86 (2016), 55-65  Jörg C., Mont K., Pornsak S., Response analysis of nonlinear vibroimpact system coupled with viscoelastic force under colored noise excitations, Chemical Engineering Research and Design, 88 (2010), n.1, 100-108  Vedmitskyi Y. G., Kukharchuk V. V., Hraniak V. F., New nonsystem physical quantities for vibration monitoring of transient processes at hydropower facilities, integral vibratory accelerations, Przeglad Elektrotechniczny, 93 (2017), nr.3, 69-72  Kukharchuk V. V., Kazyv S. S., Bykovsky S. A., Discrete wavelet transformation in spectral analysis of vibration processes at hydropower units, Przeglad Elektrotechniczny, 93 (2017), nr.5, 65- 68  Kukharchuk V. V., Hraniak V. F., Vedmitskyi Y. G., Bogachuk V. V., etc., Noncontact method of temperature measurement based on the phenomenon of the luminophor temperature decreasing, Proc. SPIE, 10031 (2016)  Kukharchuk V. V., Bogachuk V. V., Hraniak V. F., Wójcik W., Suleimenov B., Karnakova G., Method of magneto-elastic control of mechanic rigidity in assemblies of hydropower units, Proc. SPIE, 10445 (2017)  AllaEl-Marhomya A., Eldin A., Stability analysis of rotor-bearing systems via Routh-Hurwitz criterion, Applied Energy, 77 (2004), n.3, 287-308  Jacob K., Hurwitz stability of weighted diamond polynomials, Systems & Control Letters, 22 (1994), n.4, 303-312  Azarov O. D., Dudnyk O. V., Kaduk O. V., Smolarz A., Burlibay A., Method of correcting of the tracking ADC with weight redundancy conversion characteristic, Proc. SPIE, 9816 (2015)  Azarov O. D., Murashchenko O. G., Chernyak O. I., Smolarz A., Kashaganova G., Method of glitch reduction in DAC with weight redundancy, Proc. SPIE, 9816 (2015)  Osadchuk V. S., Osadchuk A. V., The magneticreactive effect in transistors for construction transducers of magnetic field, Electronics and Electrical Engineering, Technologija, 3 (2011), n.109, 119-122  Osadchuk V. S., Osadchuk A. V., The microelectronic transducers of pressure with the frequency, Electronics and Electrical Engineering, Technologija, 5 (2012), n.121, 105-108  Vasilevskyi O. M., Advanced mathematical model of measuring the starting torque motors, Technical Electrodynamics, 6 (2013), 76-81.  Pavlov S. V., Kozhemiako V. P., Kolesnik P. F., et al., Physical principles of biomedical optics: monograph, VNTU, 2010  Vassilenko V., Valtchev S., Teixeira J. P., Pavlov S., Energy harvesting: an interesting topic for education programs in engineering specialities, Internet, Education, Science, 2016  Vasilevskyi O. M., Yakovlev M. Y., Kulakov P. I., Spectral method to evaluate the uncertainty of dynamic measurements, Technical Electrodynamics, 4 (2017), 72-78  Voronin A., Ajtchanov B., Partyka J., Aldibekova A., Elemements automatic control of hydrodynamic systems, Informatyka Automatyka Pomiary w Gospodarce i Ochronie Srodowiska, 2 (2013), 35-36