摘要
压差活门是航空发动机数控系统燃油计量装置中重要的液压部件,其稳定性和动态性能直接影响控制系统的整体性能。根据压差活门非线性微分方程,采用小偏差线性化方法,推导出了压差活门的动态数学模型,得到了压差活门的方框图以及传递函数。选取某压差活门参数建立了Simulink仿真模型,分别在频域和时域分析了其动态性能。结果表明:在频域上,比较了有无节流器时的回路增益函数伯德图,认为敏感油路上的节流器可以改善稳定性且提高控制精度,通过设计节流器的尺寸可以调节穿越频域,从而改善系统的动态性能;在时域上,分析了不同节流器尺寸下阶跃响应的动态性能,其试验结果与实际工程经验一致。
Pressure differential valve is a significant component in fuel metering device of aeroengine hydraulic control system,which stability and dynamic performance affect the overall performance of control system.According to the non-linear differential equation,the dynamic model derivation,block diagram and the transfer function of the pressure differential valves was obtained by the small deviation linearization.The Simulink model was built to analyze the dynamic performance differential valve on the frequency and time field by its parameters.The results show that the hydraulic feedback restrictor can improve the stability and control accuracy by comparing the Bode diagram of loop-gain function with or without the resistor on the frequency field.The crossover frequency was changed by designing the resistor sizes to improve the dynamic performance of system.The experimental results of the dynamic performance for step-response are in accord with the engineering experience on the different resistor size of time field.
出处
《航空发动机》
2015年第3期44-50,共7页
Aeroengine
基金
国家重大基础研究项目资助
