摘要
飞机上冲压空气涡轮(ram air turbine,RAT)的工作环境具有风速、飞行高度和温度上的随机性,需在诸多工况下都保持稳定运行。该研究对来流空气作用下的冲压空气涡轮调速系统进行了控制学建模,基于此模型开展多种工况下的稳定性分析。首先,根据涡轮工作原理,针对某型RAT的调速系统建立了能够反映涡轮真实响应的动力学模型;然后,将调速系统在转速平衡状态附近做线性近似处理,得到能够描述调速系统在负载扰动下稳定性的闭环控制模型,结合动力学模型的仿真结果和控制学模型的理论计算,分析了涡轮在负载冲击下的响应特性;最后,对调速系统进行稳定性评估,系统地研究了调速系统在不同工作环境中的稳定性规律。数值仿真结果表明,所建立的闭环控制模型能准确反映RAT调速系统的稳定性程度,在风速大、飞行高度低的工况中该系统稳定程度最薄弱。
The operational environment of the ram air turbine(RAT)on aircraft is characterized by randomness in wind speed,flight altitude,and temperature,necessitating stable operation across diverse working conditions.A control model was established for the RAT speed control system under the influence of incoming air,and stability analysis was conducted under various operating conditions.Initially,based on turbine operating principles,a dynamic model was formulated for the speed control system of a RAT,capable of reflecting the true response of the turbine.Subsequently,the speed control system was approximated linearly near the speed equilibrium state to derive a closed-loop control model that can describe system stability under load disturbance.By combining the simulation results of the dynamic model with the the oretical calculations of the control model,the response characteristics of the turbine under load impact were analyzed.Ultimately,the stability of the speed control system was evaluated,and the stability laws of the speed control system in different operational environments were systematically investigated.The numerical simulation results indicate that the closed-loop control model accurately reflects the stability of the RAT speed control system,with system stability being weakest in operational conditions of high wind speed and low flight altitude.
作者
郭欣睿
姜金辉
GUO Xinrui;JIANG Jinhui(State Key Laboratory of Mechanics and Control for Aerospace Structure,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《振动与冲击》
北大核心
2025年第12期192-200,共9页
Journal of Vibration and Shock
