Risk assessment of mine labor safety by fuzzy logic

Energy-force interactions in vibroimpact systems

“…In vibroimpact modes, resonant polyfrequency oscillations are excited in such significantly nonlinear systems, which are absolutely resistant to such changes in a wide range of changes in both the parameters of the system itself and the technological load [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Such oscillations increase the efficiency of technological processes due to the intensification of the vibration effect, polyfrequency excitation of the technological medium and, due to resonant oscillations, the reduction of energy consumption, which is relevant and important for the domestic processing industry.…”

“…The universal mathematical model is developed on the basis of the mathematical model of vibrating feeders with an adaptive vibration impact drive, which is modeled by the layout scheme (variant 1), and vibrating polyfrequency screens, which is modeled by the layout scheme (variant 3) [19][20][21][22]. The model is developed in the form of a computational algorithm for its numerical research, which is implemented in the form of a computer program in the FORTRAN algorithmic language, and has an interface that allows to set and change the parameters of the vibroimpact system, determine the dependence of the amplitudes, velocities and accelerations of the oscillations of its masses, rotation angles, angular velocities and accelerations of debalances of the vibrators, slips, moments of rotation and resistance to rotation of their asynchronous electric motors, phase diagrams of mass oscillations of the system and their Poincare intersections, reactions in two-sided and one-sided elastic bonds, energies, powers and work of oscillations in the system, perform spectral analysis of mass oscillations, determine periodicity or non-periodicity of system oscillations, etc.…”

“…The main directions in increasing the efficiency of vibration technologies for the processing of mineral raw materials are the selection and optimization of dynamic load parameters of vibration equipment and technological raw materials on the working body, related to both energy-force interactions and the mechanical and structural characteristics of the raw materials. For polydisperse systems, which are the majority of technological materials at processing mineral raw, the optimal modes of vibration influence lie in the area of resonant polyfrequency excitation and require deep and independent regulation of the parameters of vibration excitation, taking into account the change in the values and characteristics of the technological load [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

“…Based on this, as well as taking into account the lower dynamic load of the vibrator, the vibroimpact system (variant 3) is more attractive for implementation in various vibration devices for vibration technologies of mineral processing. Such a dynamic scheme can be successfully used for implementation in such vibrating equipment as vibrating screens for particle size classification of various mineral raw materials, including finely dispersed ones (from tens of microns) [19][20][21][22], in "light" vibrating feeders for vibrating output of mineral raw materials from containers, especially raw materials prone to caking. In turn, the dynamic scheme (variant 1) can be successfully used in "heavy" vibration systems, such as vibration feeders for the vibration output of crushed ore from mining operations [21], vibration conveyors for the transportation of mineral raw materials, especially with the content of difficult-to-transport fine size classes.…”