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The paper mentions some problems of automated control system development for growth of large (150 kg and above) single crystal sapphires. We obtain an analytical equation for the temperature distribution and thermal stresses along the crystal axis during the growth phase. An analysis was carried out and numerical estimates were obtained for the axial distribution of components of thermoelastic stresses depending on the physical, optical, and geometric parameters of the crystal. It is shown that the cause of thermal stresses and blocks during crystal growth is the nonlinear temperature dependence of thermal conductivity and thermal expansion coefficients.

This article describes the approach to the construction of the Automated Management System (AMS) of sounders with high upgrading rate. The objective of this article is the synthesis of the structure of the automated management system of chime upon the principle of combined management with adaptive equalizer. Technical solutions have been created and implemented through the synthesized structure. As a result, we have developed the system structure itself, the mechanism of web-based access to its technological parameters and its self-tuning algorithm. Particular attention is paid to the selection of the best parameters of the control signal, namely, to the period and duty factor of the Pulse-Width Modulation (PWM), which was chosen as a means of changing the speed and direction of rotation of the motor driving the linkage. The analysis of experimental studies showed that in order to achieve the loudest sound one needs to vary the period and the duty factor of PWM, with regard to the environment.

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