TY JOUR TI OSCILLATIONS IN A NON-AUTONOMOUS AUTOMATIC SYSTEMS WITH DRY FRICTION UNDER HARMONIC EXTERNAL ACTION KW dry friction KW mathematical model KW non-Coulomb idealization KW local automatic level control system KW self-oscillations KW limit cycle KW phase plane KW parameter space JO Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies AU Aung, P.. PY 2016 IS PB Astrakhan State Technical University