基于新型音轮的涡桨发动机桨距-相角-转速一体化测量研究

Integrated Measurement of Propeller Pitch, Phase Angle and Speed of Turboprop Engine Based on New Phonic Wheel

为了有效解决多传感器安装的困难和音轮转子不平衡问题,研究了一种基于新型音轮的涡桨发动机桨距-相角-转速一体化测量方法,提出带有多个常规齿和一组对称标志斜齿的新型音轮结构,经过信号处理模块把传感器波形调理成方波,分析方波边沿时刻就能获取螺旋桨的桨距、相角和转速。通过COMSOL数值仿真研究了不同音轮结构对电压波形及测量精度的影响,设计了涡桨发动机桨距-相角-转速一体化测量试验台。试验结果表明,在非极端齿位差角范围内,桨距和相角的误差曲线呈现很好的线性特性,经过线性补偿修正后,桨距、相角和转速测量精度可以分别控制在±0.7%,±0.05%和±0.027%,可以满足涡桨发动机控制精度需求。

In order to effectively solve the problems of multi-sensor installation space and unbalance of phonic wheel rotor,an integrated measurement method of propeller pitch,phase angle and speed of turboprop engine based on new phonic wheel was studied. A new 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. Through numerical simulation of COMSOL,the effects of different phonic wheel structures on voltage waveform and measurement accuracy were studied. An integrated sensor test platform was designed for verifying propeller pitch,phase angle and speed measurement of turboprop engine. Experiment results show that the error curves of propeller pitch and phase angle show good linear characteristics in the nonextreme ranges at teeth difference angle. After linear compensation,the measurement accuracy of propeller pitch,phase angle and speed can be maintained within the range of ±0.7%,±0.05% and ±0.027%,respectively,which can meet the control accuracy requirements of turboprop engines.