SYNTHESIS OF EFFICIENT SYSTEMS FOR CONTROLLING THE TEMPERATURE REGIME OF A MUFFLER FURNACE
Keywords:
Muffle furnace, cross connections, control systems, simulation control, quality indicatorsAbstract
Muffle furnaces with two independent power sources are used for hardening small parts. The study of the dynamic properties of such muffle furnaces showed that there are cross-connections between input and output values. To study the degree of mutual influence between the inputs and outputs of the object, the Bristol matrix and the complex coefficient of connectivity were used. The obtained results showed that there are significant cross-connections between the input and output values of the muffle furnace.
Therefore, the synthesis of systems for automatic control of the temperature regime of the muffle flow was carried out taking into account the presence of cross connections. Three variants of muffle furnace temperature control systems have been developed. The first option is a multi-channel single-circuit SAC based on temperature at control points; the second option is a multi-channel hybrid single-circuit SAC based on the temperature at the lower control point and a tracking system based on the temperature difference in the control points of the workpiece, and the third option is an autonomous SAC with resolution of cross channels using an external corrector, which "eliminates" the influence of cross channels and provides autonomous adjusting the controls.
The conducted comparative analysis of developed SACs by the method of simulation modeling made it possible to establish that the indicators of the quality of work of synthesized SACs meet the stated technical requirements both with a jump-like and with a program change in time of the task.
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