Delayed feedback control of pitch-flap instabilities in helicopter rotors

Cepeda-Gomez, Rudy

doi:10.1016/b978-0-12-814928-7.00006-8

Cited by 1 publication

(1 citation statement)

References 17 publications

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“…To study the vibration control of our system, various laws of time-delay control have been used, which are the position feedback (PF) control and velocity feedback (VF) control lows, also used by many researcher (Alhazza and Majeed 2012, Liu et al 2019, Ali et al 1998, Cepeda-Gomez 2019 and with many applications in ingeniering (Cepeda-Gomez 2019, Wu et al 2015). Consider these time-delay control laws and note that the control is triggered when the sensor detects the parameters (speed and position) of the beam and sends them as input to the actuator which will therefore adjust the beam.…”

Section: Vibration Controlmentioning

confidence: 99%

Amplitude resonance response and feedback control of cantilever beams with tip-mass under aerodynamic load

Zemtchou¹,

Takam²,

Nguenang³

et al. 2021

Phys. Scr.

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The dynamic of a cantilever beam with tip mass is studied under an aerodynamic loading. The effects of coupling is investigated by tacking into account the fluid flow. Using the multiple time scale method, the approximative solutions are found and the study of their stability is made by the Routh-Hurwitz stability criterion. The influence of parameters on the system is studied at the harmonic and subharmonic resonances. The results show that, the effects of tip mass can be neglected in harmonic resonance case ,while they are more important in subharmonic resonance cases. The results equally demonstrate that an increase of the stable state fluid velocity reduces the amplitude of vibrations. In addition, the hysteresis phenomenon studies show that it is principally induced by nonlinearity coefficients. Finally, time-delay feedback control is applied and the effects of controlling are observed on amplitude response curve at the harmonic resonance, from where we note that optimized choice of control parameters can be useful in controlling vibrations.

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