摘要
分析了发动机气路静电监测的原理,对监测系统关键器件—静电传感器的灵敏度分布和频率响应特性进行了研究,通过数值模拟和曲线拟合的方法确定了传感器的灵敏度分布函数,进而推导了传感器的频率响应函数,分析了传感器探极半径和对灵敏度分布与频率响应影响,以及颗粒运动速度对频率响应的影响。理论分析和模拟实验结果表明:静电传感器在空域和时域内均为低通滤波器,半径大的传感器灵敏度较高,空域频谱和时域频谱较宽。颗粒运动速度越快,传感器输出信号的频带越宽,但幅值相对越小。
The principle of engine gas path electrostatic monitoring technology is analyzed, research on sensitivity distribution and frequeney response of key device of the monitoring system--electrostatic sensor is made. Numerical simulation and curve fitting are applied to acquire sensitivity distribution function, then frequency response function is deduced. The effect of various sensor radius and particle moving velocity on sensitivity distribution and frequency response is analyzed. Theoretic analysis and experimental results show the electrostatic sensor acts as a low-pass filter in spatial domain and time domain, and sensor with larger radius has characteristics of higher sensitivity and wider frequency range in spatial domain and time domain. The higher speed of particle moving,the wider frequency bandwidth of signal has.
出处
《传感器与微系统》
CSCD
北大核心
2008年第11期28-31,共4页
Transducer and Microsystem Technologies
基金
国家"863"计划资助项目(2006AA04Z427)
国家自然科学基金资助项目(60672164)
关键词
航空发动机
静电传感器
气路颗粒
状态监测
aero-engine
electrostatic sensor
gas path debris
condition monitoring
