Особливості статичних характеристик регулятора обертів вільної турбіни насоса-регулятора типу НР-3
| Rok vydání: | 2020 |
|---|---|
| Předmět: |
0209 industrial biotechnology
Electronic speed control lcsh:Military Science Automatic control Computer science lcsh:U Turboshaft Regulator 02 engineering and technology Turbine law.invention турбовальний газотурбінний двигун насос-регулятор регулятор обертів статична характеристика коливання обертів двигуна гістерезис характеристики 020901 industrial engineering & automation 020401 chemical engineering Control theory Acceptance testing law Hydraulic brake 0204 chemical engineering Turbocharger |
| Zdroj: | Системи озброєння і військова техніка, Iss 4(64), Pp 93-100 (2020) |
| ISSN: | 2518-1580 1997-9568 |
| DOI: | 10.30748/soivt.2020.64.12 |
| Popis: | The results of experimental studies of the static characteristics of the speed controller of a free turbine of the pump-controller of the HP-3 type, intended for a turboshaft gas turbine engine of the TВ3-117 type, are presented. When conducting acceptance tests of engines on hydraulic brake units, malfunctions are recorded, which manifest themselves as steady fluctuations in the speed of the turbocharger and free turbine rotors in the area of the free turbine regulator. Checking the pump-regulators according to the manufacturer's acceptance test report does not reveal the cause of this malfunction. As a result of the analysis of experimental static characteristics, it was revealed that the actual static characteristics of real regulators are very different from each other even within the acceptable values of the acceptance test protocol and have characteristic features: different values of statism, hysteresis, as well as deviations from linearity - breaks and fractures. Small statism of the regulator (large gain) reduces the margin of stable operation of the automatic control system, which contributes to the development of self-oscillations, and at certain values of the dynamic parameters of the engine, the control process may become unstable. The hysteresis of the static characteristic of the regulator plays an important role in vibration damping. It should be positive, since it is conditiones by the frictional forces in the hydraulic drive of the main metering needle. Therefore, a zero or negative hysteresis of the static characteristic of the regulator indicates a defect in the unit, which is confirmed by a tendency to self-oscillation. Non-linearity of the static characteristic of the regulator can lead to unsatisfactory operation of the automatic control system by the engine. It is shown that the static characteristic of the speed controller of a free turbine is a confirmation of the quality of manufacture or repair of pump-regulators of the HP-3 type during acceptance tests. |
| Databáze: | OpenAIRE |
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