An analysis is conducted for the spider bolt model which is an equivalent model corresponding to the spatial bolt model. The aim of this study is to develop a model of the single-bolted joint separated from the bolted flange connection. With this approach it is possible to independent consideration of each system's element in order to find the best model of this element. The paper is a part of wider research based on the system approach to the problem of modelling and calculations of bolted flange connections. Reports are generated on overloading and RUL. System supports a database of maintenance actions and elements failures. Parameters adaptation of nonlinear dynamical models is provided and technological loads optimization by the criterion of RUL in rolling stands. Based on this approach, the new monitoring system is developed for the multi-stand mill with integration into plant automation infrastructure. The more acceptable approach is to monitor static torques of electric motors and, having identified multi-body models, to calculate remaining useful life (RUL) of elements. It appears more beneficial to monitor dynamic torques in addition to vibration signals, but this is restricted to the installation of strain gauges. Reliable vibration monitoring is very complicated due to inherent changes of technological regimes, treated material and drive speed. Angular and radial gaps produce extremely high dynamic loads and abrupt failures in the multi-stand hot rolling mills. Operation of industrial metallurgical plants is associated with significant wear in spindles, gearboxes and bearings where difficult to implement digital diagnostic tools due to harsh operating conditions.
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