基于转矩振幅动态信号去噪的航空发动机转矩振动模糊控制技术

Fuzzy Control Technology for Aircraft Engine Torque Vibration Based on Torque Amplitude Dynamic Signal Denoising

摘要:

航空发动机转矩振动会引起机身共振,导致机身振动增大,引发结构失效。为了确保飞机的安全性,设计基于转矩振幅动态信号去噪的航空发动机转矩振动模糊控制技术。基于航空发动机整机动力学分析结果,明确其运行过程中的幅值、频率、相位等振动特性。以此为基础,使用MEMS加速度传感器采集航空发动机实际转矩振幅动态信号,并利用奇异谱分析算法对采集到的动态信号实施去噪处理,提取出主要的信号成分。设计模糊控制技术,并将去噪处理后的转矩振幅动态信号作为输入变量,实现发动机转矩振动模糊控制。测试结果表明,设计控制技术应用后,具备适应不同转子位移变化的能力。在不同支承刚度下,设计控制技术的转矩振动抑制率较高。在宽频状态测试点处外机匣表面加速度收敛至0.04m/s2以内,窄频状态测试点处外机匣表面加速度收敛至0.03m/s2左右。因此,设计控制技术具有良好的控制效果,可以保证航空发动机的稳定性和具有较高的抑制性能。

Abstract:

The torque vibration of aircraft engines can cause resonance in the fuselage, leading to increased vibration and structural failure. In order to ensure the safety of the aircraft, a fuzzy control technology for aircraft engine torque vibration based on torque amplitude dynamic signal denoising is designed. Based on the dynamic analysis results of the entire aircraft engine, clarify its vibration characteristics such as amplitude, frequency, and phase during operation. Based on this, MEMS acceleration sensors are used to collect the actual torque amplitude dynamic signals of aircraft engines, and singular spectrum analysis algorithms are used to denoise the collected dynamic signals and extract the main signal components. Design fuzzy control technology and use the denoised torque amplitude dynamic signal as the input variable to achieve fuzzy control of engine torque vibration. The test results indicate that the design control technology has the ability to adapt to different rotor displacement changes after application. Under different support stiffness, the torque vibration suppression rate of the designed control technology is relatively high. At the broadband state test point, the surface acceleration of the outer casing converges to within 0.04m/s2, while at the narrowband state test point, the surface acceleration of the outer casing converges to around 0.03m/s2. Therefore, the design control technology has good control effects, which can ensure the stability of the aircraft engine and have high suppression performance.