Улучшение динамики электромеханических систем в условиях срывных фрикционных автоколебаний

Abstract

The dissertation for the degree of technical sciences candidate, specialty 05.09.03 – electrical complexes and systems. – NTU "KhPI". – Kharkiv, 2015. The dissertation is devoted to determining ways of machine and mechanism dy-namics improvement based on stick-slip frictional self-oscillations suppression by means of regulated electric drive. Conditions of stick-slip frictional self-oscillations ex-istence in open-loop one- and two-mass electromechanical systems (EMS) are specified for the friction characteristic that takes into account step decrease of the friction coeffi-cient at the starting moment, as applied to a cutting machine axial electric drive. Friction characteristic computer models are developed for low-speed runs with consideration of the rheological factor, their adequacy proved by comparison with physical and computa-tional experiment parameters. Action of two-mass EMS factors on the system motion characteristics under low-speed runs is estimated to determine a parametric means of the critical speed reduction, inefficiency of this control tool shown. A two-mass EMS with the typical basic-coordinates feedback, modal control and a various-setting subordinate-regulation structure is found unable to noticeably reduce the critical speed. A two-mass intellectual-control EMS with a feedforward perceptron network and a sliding relay regulator is researched. Computer simulation has verified the effect of significant criti-cal speed reduction and stick-slip frictional self-oscillations elimination resulted from an integral-error relay regulator application.