Fuzzy Parallel-Conveyor Device and Thermal Element Control Method

Рurpose of research. Operation speed increase of fuzzy parallel-conveyor  device based on a new method of thermal element controlling.

Methods. Cutting tool and part's surface are heated in the process of device handling using NC-machining technique. Thermal deformations reduce the surface of workpiece treatment quality. Various methods are used to compensate temperature deformations: spraying of lubricating-cooling liquid, cooling by compressed air. The device is proposed to be used for cooling control which is implemented on Peltier thermo element and FPLD Spartan 3E. Constant control is necessary to control thermal errors and control systems are built on artificial intellect models. As input parameters are indeterminate, fuzzy logic is used to describe the connection between input and output parameters.

Results. A fuzzy mathematical model has been developed to calculate current intensity. The intensity depends on the change of input parameters. Tests conducted at 50 MHz showed that 380 ns are necessary to calculate current intensity according to the developed mathematical model. Fuzzy mathematical model is implemented on the basis of FPLD Spartan 3E for faster operation. A universal formula for current-voltage transformation was developed. Test results showed that the voltage calculation is carried out in 190 ns. It was stated that thermo element control device produces a control signal within 570 ns.

Conclusion. The article describes a device for temperature controlling conditions in the product processing area. In this device thermal element controlling is done by a current generator implemented on an operational amplifier and on a bipolar transit generator. A device for current-voltage transformation is implemented on FPLD. It was developed to receive a pressure signal for NC-machining technique actuators to receive a pressure signal.  A fuzzy MISO model has been  developed  to calculate  current  magnitude  that  depends  on temperature  change  in the cutting  zone. Conducted tests showed that the speed of this device is several times higher than present analogues.

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