IDENTIFICATION OF SPINDLE VIBRATION BY RESULTS OF MEASURED SPINDLE UNIT BODY VIBRATION

Abstract

Purpose. Developed a method of spindle vibrations identification by measuring the vibrations of spindle body using estimated  transfer functions.

Design/Methodology/Approach. Research is being performed of spindle unit vibrations under the effect of internal sources of vibroexcitation – spindle bearings. The procedure of transfer functions determining is reviewed using example of modeling of dynamical compliances of the mechanical vibration system, which consists of subsystems: mandrel, spindle on rolling supports, spindle body and frame, elastically mounted on massive foundation. Vibrational excitation, as a unit harmonic force, applied at the location of the first bearing of spindle leading support. Transfer functions are obtained by solving the system of equations of strain compatibility at the points of subsystem disconnection.

Findings. Obtained experimental spectrum of spindle unit body vibrations; performed calculation of transfer functions and modeling of theoretical vibration spectrum of the spindle.

Originality/value. Established, that difference of the same harmonic excitation sustaining by various mechanical systems leads to zones with different intensity of vibration appearing in their vibration spectrums.