航空涡轴发动机转速与扭矩信号的仿真研究

Simulation Research on Speed and Torque Signal ofAero Turboshaft Engine

摘要:

针对航空涡轴发动机转速与扭矩信号的仿真问题，分析检测发动机转速与扭矩的原理以及信号特性，创新提出在ZYNQ平台上实现仿真信号的合成方法。采用基于直接频率合成器的设计，计算分辨率、数据位宽、无杂散动态范围等参数以及分析对精度的影响。为保证实时性要求，依托片上高速数字总线AXI4控制频率和相位的设置，产生两路同步数字正弦信号，通过比较、滤波与合成实现仿真信号的输出。在硬件方面，采用数模转换与信号调理电路，在保证各项性能指标前提下，优化了器件选型，同时增加输出接口保护，避免因静电或误操作引起的故障。实际使用情况表明，仿真信号精度高、运行稳定可靠，目前已被应用到多个航空涡轴发动机的实验项目。

Abstract:

Aiming at the simulation problem of aero turboshaft engine speed and torque signal, the principle of detecting engine speed and torque and signal characteristics are analyzed. A new method of synthesizing simulation signal on ZYNQ platform is proposed. The design based on direct frequency synthesizer. The parameters of resolution, data bit width, spurious free dynamic range are calculated to analyze the influence on accuracy. Two synchronous digital sinusoidal signals are generated by setting the frequency and phase through on-chip high-speed digital bus which is AXI4 in order to ensure the real-time performance. The output of simulation signals are realized by comparison, filtering and synthesis. In terms of hardware, the digital-to-analog conversion and signal conditioning circuits are used to optimize the device selection on the premise of ensuring various performance indicators. The output interface protection is added to avoid the faults caused by static electricity or misoperation. The actual application shows that the simulation signal has high accuracy and reliable operation. It has been applied to several experimental projects of aero turboshaft engines.