基于LPV的航空发动机鲁棒变增益控制

Based on the LPV aeroengine robust variable gain control

摘要:

随着我国现代化进程的不断加快,航天航空技术标准越来越高,对于航空发动机运转工况的鲁棒性和适应性提出了更高的要求。传统的航空发动机变增益设计步骤繁琐,不能将发动机置于整个航空器的运转去考虑设计,使发动机变增益缺乏相应的稳定性和适应性,易出现系统问题。为此,提出一般基于LPV的航空发动机鲁棒变增益控制系统,依据航空发动机结构参数,考虑到航空器在空中负载特性,计算出新的约束极点 模糊变增益,在航空器发动机工作范围连续增益,避免了传统增益切换情况,在转速控制上确定误差等因素,将非线性控制设计分解为多个线性子问题,使航空器控制系统能够沿着LPV参数轨迹保持良好的运转,保持稳定性能。仿真实验证明,提出的基于LPV的航空发动机鲁棒变增益控制系统控制效果优于传统方法,在航空器发动机转速改变时,控制精度能够满足要求 ,改变航空器负载时,有效对目标进行变增益控制。提出的控制方法对航空发动机鲁棒变增益控制问题提供了新的解决办法,具有较大应用价值。

Abstract:

With the accelerating process of our modernization, aerospace technology standard is higher and higher, the aircraft engine operating condition the robustness and adaptability of higher requirements are put forward. Traditional steps of designing variable gain trival, not the engine in the operation of aircraft in general to consider the design, make the engine variable gain lack of stability and adaptability, easy system problems. For this, based on general LPV aeroengine robust variable gain control system, on the basis of aeroengine structure parameters, considering the load property of the aircraft in the air, to calculate the fuzzy variable gain new constraints pole, continuous gain in aircraft engine working range, avoid the traditional switch gain situation, determine the error factors such as in the speed control, nonlinear control design is decomposed into multiple linear problem, make the aircraft control system can keep good running along the LPV trajectory parameters, stable performance. The simulation experiments show that the proposed robust variable gain control of aeroengine based on LPV system control effect is superior to the traditional method, the aircraft engine speed change, control accuracy can meet the requirements, change aircraft load, variable gain control of target effectively. Control method is proposed for aeroengine robust variable gain control problem provides a new solution, has higher application value.