Abstract
A real case study is represented of abrupt failures in a new multi-motor gear drive of vertical rolls in the heavy slabbing mill. Modal analysis is conducted, and the lowest torsional vibration modes are verified by the data from an industrial plant. Conditions of parametric resonances due to variable stiffness of teeth are determined within the range of working speed. The branched gear drive is investigated by the non-linear dynamical model with backlashes. It is shown that instantaneous dynamic loads in driveline are strongly dependent on the difference in gap sizes and phase shift between two intermediate gears in the output gear wheel coupling. Deviation in electrical parameters by 0.5 % is considered as the additional cause of not equal load sharing of parallel motors. Results of this research allowed preventing further failures of the gearbox and optimizing slabbing mill control. The proposed approach can be used in other multi-motor machines.
Highlights
Multi-motor, split path power or so-called summation drives are used in large-scale machines and rotating aggregates when the technological capabilities of equipment manufacturers limit the dimensions of gearboxes of traditional design
Summarizing the wide scope of studies, we can classify them as follows: – optimal control for equal load share between parallel drives; – vibration diagnostics of geared drivelines; – analysis of gears phasing in planetary gear drives; – estimation of kinematic errors influences on gears meshing; – monitoring of mechanical loads by the electric drives current; – passive and active damping of torsional vibrations in drivelines; – modelling of loads sharing in parallel branches; – modelling of torsional vibration with non-smooth nonlinearities
The obtained results on parametric oscillations in a slabbing mill are consistent with the data on an multi-motor drive system (MMDS) of platform turning in open-pit mines excavators and tilting mechanism in steel converter having spur gear couplings
Summary
Multi-motor, split path power or so-called summation drives are used in large-scale machines and rotating aggregates when the technological capabilities of equipment manufacturers limit the dimensions of gearboxes of traditional design. Summarizing the wide scope of studies, we can classify them as follows: – optimal control for equal load share between parallel drives; – vibration diagnostics of geared drivelines; – analysis of gears phasing in planetary gear drives; – estimation of kinematic errors influences on gears meshing; – monitoring of mechanical loads by the electric drives current; – passive and active damping of torsional vibrations in drivelines; – modelling of loads sharing in parallel branches; – modelling of torsional vibration with non-smooth nonlinearities Following these approaches, in-depth analysis and mathematical simulation of dynamical processes in the multi-motor gear drive of the heavy slabbing mill is represented in this paper. Interactions between vertical and horizontal stands and deviation of electric motors parameters are emulated in the developed non-linear dynamical model
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