Integrated Measurement System of Three Parameters of Turboprop Engine Based on Novel Phonic Wheel

Sensor is the foundation of aero-engine health management. In turboprop engine measurement system, in order to effectively solve the problems of multi-sensor installation space and unbalance of phonic wheel rotor, an integrated measurement system of propeller pitch, phase angle and speed of turboprop engine based on novel phonic wheel was studied. A novel phonic wheel structure with multiple regular teeth and a set of symmetrically marker helical teeth is proposed, the sensor waveform is modulated into square wave through the signal processing module, and the propeller pitch, phase angle and speed of propeller can be obtained by analyzing the edge time of the square wave. Using numerical simulation of COMSOL, the influence of different phonic wheel structures on voltage waveform and measurement accuracy were studied. Simulation results show that the error curves of propeller pitch and phase angle show good linear characteristics in the non-extreme ranges of difference angle of teeth. Under the condition of no error compensation, the measurement errors of propeller pitch, phase angle and speed can be maintained within -0.35mm$\sim 0.05mm, 0^{\circ}\sim 0.11^{\circ}$and $0.01\sim 0.01$r/min separately, which can meet the control accuracy requirements of turboprop engine.