Experimental analysis of the operability of a system to control the oscillations of a mechanical system with self-synchronizing vibration exciters

Self-synchronization features of inertial vibration exciters in two-mass system

“…At the same time, for resonant machines with automatically controlled oscillation modes, it is of considerable interest to analyze synchronous motion regimes in resonant regions. In these regions, the system with an asynchronous electric drive most shows the features of nonlinear behavior to the utmost, which is caused by occurrence of relatively large oscillation amplitudes [2,7,8,16,[18][19][20]. Some control systems for automatic adjustment and maintenance of resonant oscillations, which operating principle is based on measuring the phase relations between the exciting force and the oscillations, are considered in [19,20].…”

“…In these regions, the system with an asynchronous electric drive most shows the features of nonlinear behavior to the utmost, which is caused by occurrence of relatively large oscillation amplitudes [2,7,8,16,[18][19][20]. Some control systems for automatic adjustment and maintenance of resonant oscillations, which operating principle is based on measuring the phase relations between the exciting force and the oscillations, are considered in [19,20]. Herewith, as shown in [20], neglecting the features of self-synchronization of exciters in control algorithms does not allow predicting the frequency of jump to the above-resonant region.…”

“…Some control systems for automatic adjustment and maintenance of resonant oscillations, which operating principle is based on measuring the phase relations between the exciting force and the oscillations, are considered in [19,20]. Herewith, as shown in [20], neglecting the features of self-synchronization of exciters in control algorithms does not allow predicting the frequency of jump to the above-resonant region. Thus, one should either reduce the adjustment accuracy or increase the number of necessary measurements and their processing, which significantly complicates the measuring system and reduces its performance.…”

Analysis of oscillations of a mechanical system with inertial exciters at an alternating position of it’s mass center

“…However, in practice, resonant adjustment is difficult due to parameters changes in time, primarily operation load value and its location on a working body. In papers [8][9][10] it was proposed to use automatic control system to maintain resonant mode of oscillations for centered schemes of vibrating machines (when the resultants of the inertia forces, exciting forces and resilient forces are collinear to each other and pass through the system's center of mass). In this paper dynamics of similar centered systems was analyzed in detail, taking into account possible changes in mass of operation load.…”

Experimental analysis of the oscillations of two-mass system with self-synchronizing unbalance vibration exciters

“…Note that when developing such type of vibrating machines, as a rule, the issue of their stable operation at a predetermined excitation frequency, usually at a pre-resonant or beyond-resonant frequency, is investigated [1,4,7,8]. For machines with automatic control systems for vibration modes, and in particular resonance machines, it is of considerable interest to analyze synchronous motion regimes in resonant regions in which, due to the occurrence of finite displacements and nonstationary nature of the technological load, the nonlinear features of the system behavior are appeared to the greatest degree [3,5,[8][9][10][11].…”