Instability and self-oscillations in electro-hydraulic servo drive

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Abstract

One of important problems of closed-loop hydraulic systems is ability of self-oscillations. Linear simulation shows unlimited growth of amplitude, but self-oscillations appear in a real hydraulic drive because of wastages, limits of endurance and oscillation energy. Main purpose of the research is to make a numerical simulation to correspond main parameters of self-oscillations of electro-hydraulic servo drive with characteristics of drive. Results of numerical simulation could be improved with transition to nondimensional variables. In this case several nondimensional complexes present whole hydraulic system instead of many variables and parameters in case of dimensional model. Main result is stability and amplitude of self-oscillations of electro-hydraulic servo drive depends of nondimensional variable Sh, if hydraulic time constant is more than mechanical time constant, then less oscillation energy applies to drive. Simulation model in this research is quite far from real electro-hydraulic servo drive, so improvement of simulation is purpose for the future researches.

About the authors

Robert Sunarchin

Peter the Great St.Petersburg Polytechnic University

Author for correspondence.
Email: sunar1939@mail.ru

Candidate of technical science, lecturer of Hydraulic Machines, Hydraulic Drives and Hydropneumoatomatics department

Russian Federation

Maksim Mashkov

Peter the Great St.Petersburg Polytechnic University

Email: m.mashkov1@gmail.com

Student of Hydraulic Machines, Hydraulic Drives and Hydropneumoatomatics department

Russian Federation

Artem Matrosov

OOO "PIK 21"

Email: a.matrosov.hydro@mail.ru

Engineer

Russian Federation

References

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  2. Solodovnikov, V.V. (1967), Technicheskaya kibernetika. Teoriya avtomaticheskogo regulirovaniya , Mashinostroenie, Moscow, Russia, 770 p.
  3. Popov, D.N. (2001), Dinamika i regulirovanie gidro- i pnevmosistem , Mashinostroenie, Moscow, Russia, pp. 83-98.
  4. Bazhenov, A. I., Gamynin, N. S. and Karev, V. I. (1978), Proektirovanie sledyaschih privodov letatelnyh apparato , Mashinostroenie, Moscow, Russia, 190 p.
  5. Guhman, A.A. (1973), Vvedenie v teoriyu podobiya , Vishaya shkola, Moscow, Russia, pp. 141-143.
  6. Sunarchin, R.A. (2005), Vybor parametrov gidromekhanicheskikh regulyatorov aviatsionnih dvigateley. Chislennye metody issledovaniya , Study Guide, Samara State Aerospace University, p. 35.

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Copyright (c) 2019 Роберт Авальевич Сунарчин, Максим Александрович Машков, Артем Владимирович Матросов

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Journal of Dynamics and Vibroacoustics

ISSN 2409-4579 (Online)

Publisher and Founder: Samara National Research University, 34, Moskovskoye shosse, Samara, 443086, Russian Federation.

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E. V. Shakhmatov 

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