Purpose – This paper aims to present a robust design approach to realize disturbance attenuation for a yaw – pitch gimballed system subject to actuator saturation and disturbances. Design/methodology/approach – To minimize the impacts of disturbances in the presence of saturation nonlinearity and acquire desired response performance, the control approach is of double closed-loop configuration. State feedback controllers are synthesized via convex optimization and used to stabilize the inner loops; robust controllers are synthesized via mixed H ∞ optimization and used to stabilize the outer loops. Findings – It is shown through performance simulations that the proposed control scheme is effective in terms of command following, stability and disturbance attenuation. Practical implications – The presented robust control approach provides a theoretical method to facilitate designing a stable servo control loop for a yaw – pitch gimballed seeker. Originality/value – This paper supplies an effective way of addressing stabilization problem induced from actuator saturation and system uncertainties.
Aircraft Engineering and Aerospace Technology: An International Journal – Emerald Publishing
Published: Jan 5, 2015
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