The issue of aeroengine oscillations over high-attitude and low-speed flight envelope has been an unsolved problem due to their classified nature and hard reproduction in simulated altitude test stand. Efforts have been sought for either structural integrity or component damage. However, it is rarely realized that the oscillations can be an inherent property of the engine itself. Consequently, a dynamical system approach is proposed in this paper to demonstrate that engine oscillations are recurring over high-attitude and low-speed flight envelope, yet they can be suppressed through appropriate control designs. However, the resulting design can be compromised with the conventional high-gain control where the transient and steady-state performance must be balanced with disturbance attenuation performance. Examples are given to illustrate and validate the claims made through the en route analysis.

中文翻译：

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航空发动机高姿态/低马赫数振荡：机理与预防设计

航空发动机高空低速飞行包线振荡问题由于其机密性和在模拟高空试验台上难以再现，一直是一个悬而未决的问题。已经在寻求结构完整性或部件损坏方面的努力。然而，很少有人意识到振荡可能是发动机本身的固有特性。因此，本文提出了一种动力系统方法来证明发动机振荡在高姿态和低速飞行包线上反复出现，但它们可以通过适当的控制设计加以抑制。然而，最终的设计可能会受到传统高增益控制的影响，其中瞬态和稳态性能必须与干扰衰减性能相平衡。