Excitation of polyharmonic vibrations in single-body vibration machine with inertia drive and elastic clutch

Abstract

The authors analyze excitability of polyharmonic vibrations in a single-body vibration machine. The developed mathematical model of the vibration system accounts for an elastic component element included in the design of the unbalance vibration exciter drive. The operating limits, frequency content and effect of the main design factors on the flow data of the vibration machine are examined. It is found that superharmonic vibration largely contributes to the polyharmonic spectrum at certain frequencies, depending on the stiffness of the elastic component element of the clutch connecting the vibration exciter and the rotary drive.

Research into excitation of dual frequency vibrational-rotational vibrations of screen duct by ball-type auto-balancer

“…However, the vibration exciters used nowadays and the methods of the excitation of the poly-frequency vibrations do not make it possible to change the rapid frequencies of the duct vibrations and their amplitude in the process of vibrating machine operation [4]. This concerns the multimass vibration machines with several resonance frequencies [3], the vibration machines with the devices for the self-excitation of the repeated combinational parametric resonance [7], the vibration machines in which the super-harmonic vibrations are excited as the rapid vibrations due to the nonlinear transmission of a vibration drive [8] or the nonlinear characteristics of the elastic and compressible duct supports [9], etc.…”

“…On the one hand, the work in the resonance mode ensures the vibrations of the ducts of large sizes and mass with the minimum energy consumption. On the other hand, poly-frequency vibrations increase the productivity of the vibration machines [3][4][5][6][7][8][9].…”

“…In technical solutions [3][4][5][6][7][8][9], the frequencies of the excitable vibrations are rigidly connected with each other and their amplitudes cannot be changed in the process of the work of a vibration machine. This does not make it possible to change the characteristics of poly-frequency vibrations within wide limits.…”

Experimental research of rectilinear translational vibrations of a screen box excited by a ball balancer

“…Among vibrating machines such as screens, vibrating sieves, separators, the machines with two-frequency vibration exciters are promising [1][2][3][4][5][6][7][8][9]. In such machines at the box (sieve, etc.)…”

“…is carried out. The vibrations with the higher frequency provide self-cleaning of the box [2] and changes in mechanical properties of the processed material to increase the intensity of the main technological process [3].…”