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Journal of Engineering and Applied Sciences

Year: 2018  |  Volume: 13  |  Issue: 16  |  Page No.: 6754 - 6759

Modeling of the Cement Unloading Process with the Queuing Theory and Optimization of its Parameters

K. Syzrantseva and A. Tarasov

Abstract

The stuyd considers the problems arising in the process of unloading cement with vehicles on the example of OAO “Tyumenskaya Domostroitelnaya Kompaniya”. Modeling of the main parameters of the cement unloading system based on the Queuing theory has been performed. Functional relationships between the mean vehicle queuing time, the number of silos and vehicle unloading time have been built. It has been shown that with the number of silos equal to three the vehicle queue will continuously grow. The reason for this reduction of service channels is emergency shutdowns caused by equipment failure. As the operating experience shows transitions of metal pipes are mostly exposed to development of fatigue cracks. To identify the most probable locations of crack occurrence it has been suggested to use original means of registration of cyclic damage in metal such as the Integral Strain Gauge (ISG). Under strain cycling the gauge material changes its physical properties and a reaction in the form of dark spots occurs on its surface. The previously performed studies have shown that the form of the ISG reaction corresponds to the pattern of compression strain distribution. To coordinate the calculated and experimental data the ANSYS finite element package has been used in this study which allows evaluating the stress-strain state of a part. To evaluate the ISG reaction a special macros (script) in the APDL language has been developed.

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