Metrological support of onboard regulators measuring channels

Abstract

The subject of research was the development of a compact device that uses an imitator of a torque meter on the free turbine shaft to provide the metrological support for the development and production of RDC-450M-117V – the TV3-117VMA-SBM1V digital engine onboard regulator. The purpose of this study was to develop the torque meter imitator based on information about the real aircraft engine torque meter characteristics, but without its mechanical part, which is big enough and difficult to manufacture and use during the regulators' production. The real engine torque meter (which signal it was necessary to imitate) was a combination of the special free turbine output shaft (measuring shaft) with two inductors on it and a rotor rotation speed sensor (with frequency output signal). The tasks faced by developers were to investigate the real torque meter operating principle and its characteristics, first, the output signal characteristics, and to develop an electronic device that would provide the same signal reproduction. The applied methods are the real engine torque meter characteristics theoretical and experimental study on the stands of JSC "Motor Sich", processing of experimental data (waveforms of rotor rotation speed sensor) using a quantitative analysis method. The results. The design documentation and software for the torque meter imitator were developed, and the imitator was made. It is compact and comfortable to use a two-channel electronic imitator, which provides calibration and testing of the RDC-450M-117V regulator measuring channels and can operate in autonomous mode under operator control or as the engine stand-imitator part (or being connected to a PC with an installed engine mathematical model) under automatic control by the engine mathematical model. The scientific novelty of the obtained results is that the engine torque meter output signal was studied in detail and implemented in a compact electronic imitator that does not need a mechanical part similar to a real measuring shaft with two inductors on it and a rotor rotation speed sensor. The practical significance. As part of the metrological support for the development and production of aircraft engine regulators, a new compact, which is comfortable to use as a two-channel electronic imitator of a torque meter on the free turbine shaft, was developed. The developed torque meter imitator provides engine regulators with production tests. The imitator was verified during testing of the RDC-450M-117V regulator as part of the TV3-117VMA-SBM1V engine.