Actual Problems in Machine Building. Vol. 11. N 1-2. 2026 Technological Equipment, Machining Attachments and Instruments ____________________________________________________________________ 60 ENHANCING MACHINE TOOL VIBRATION RESISTANCE BY DETERMINING NON-RESONANT SPINDLE SPEED RANGE Zverev E.A., Ph.D. (Engineering), Associate Professor, e-mail: zverev@corp.nstu.ru Vakhrushev N.V., Senior Lecturer, e-mail: vaxrushev.2012@corp.nstu.ru Titova K.A., Senior Lecturer, e-mail: parcz.2011@corp.nstu.ru Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation Abstract This study addresses the issue of ensuring vibration resistance in machine tools by eliminating resonant vibrations that occur when the natural frequencies of technological system elements coincide with the frequency of the disturbing force. A methodology is proposed based on dynamic analysis using modern software tools, which reduces the computational complexity. The main drive of a specialized lathe with smooth speed regulation served as the research object. The key stages of the methodology are described: calculation of mass-inertia characteristics of drive elements, determination of torsional stiffness (compliance) of deformable shaft sections, development of an equivalent drive circuit and calculation of its characteristics, as well as computation of the system's natural vibration frequencies. For the investigated machine tool drive, to avoid resonance, a comparison was performed between the calculated natural vibration frequencies and the rotation frequency ranges of the electric motor and spindle. Keywords vibration resistance, resonance, reduced-order models, machine tools, dynamic analysis, stiffness coefficients
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