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The Huoqiu iron ore field in northwest Anhui Province is located in the North China Craton (NCC). As a large banded iron formation (BIF) iron ore field, ore bodies occur in a middle-high grade of Neoarchean metamorphic formation, forming a banded silicon–iron series from north to south. The main ore bodies can be divided into two sub-belts from bottom to upper layers, i.e. the A+B ore belt consisting...
Considering unstable oscillation in the process of rotating machinery caused by changing in load lubrication and gear meshing stiffness in shaft system, the coupled nonlinear dynamic equation of rotating mechanical drive system is established with time-varying stiffness and nonlinear friction force based on Lagrange theory. The average equation of system is solved with the aid of method of multiple...
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