A method for increasing stability of helicopter suspension based on active jet device and sling feedback
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摘要:
提出了结合主动喷气装置和吊索反馈技术的吊挂增稳方法。建立了CH-47纵列式直升机/柔性吊索/刚体吊挂物耦合飞行力学模型。针对吊挂物摆动及不稳定偏航运动,设计了一套主动喷气装置,通过涵道风扇产生抑制吊挂物摆动和偏航的阻尼力及力矩。考虑喷气装置的驱动力限制,引入吊索反馈技术进一步抑制吊挂物摆动。采用自抗扰技术控制直升机姿态以抑制吊挂物给直升机带来的扰动。研究了吊索反馈增益补偿、喷气装置最大驱动力等关键参数对吊挂增稳性能及喷气装置能量消耗的影响,结果表明:主动喷气装置的引入显著地抑制了吊挂物的摆动与偏航;结合两种增稳技术的增稳方法在合理的参数配置下,较单独采用主动喷气装置能量消耗减少,较单独采用任一种增稳技术的增稳性能增加。
Abstract:A method of increasing stability of suspension by combining active jet device and sling feedback was proposed. The coupling model of CH-47 helicopter/elastic sling/rigid body hanging object was established. Targeting the swing and unstable yaw motion of the hanging object, an active jet device was designed to generate damping force and torque to restrain the swing and yaw of the hanging object through the thrust of the ducted fan. Considering the driving force limitation of the jet device, sling feedback was introduced to further inhibit the swing of the hanging object. The attitude control of the helicopter adopted active disturbance rejection control to suppress the disturbance caused by the movement of the hanging object. The effects of key parameters such as the sling feedback gain compensation and the maximum driving force on the stability of the slung and the energy consumption of the jet were studied. The results showed that the introduction of active jet significantly inhibited the swing and yaw of the hanging object; under reasonable parameter configuration, the combined stability augmentation method had lower energy consumption and better stability augmentation performance than active jet device alone.
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