H∞ Loop-Shaping Robust Differential Thrust Control Methodology for Lateral/Directional Stability of an Aircraft with a Damaged Vertical Stabilizer

2016 ◽  
Author(s):  
Long K. Lu ◽  
Kamran Turkoglu
Keyword(s):  
Directional Stability ◽  
Loop Shaping ◽  
Thrust Control ◽  
Control Methodology ◽  
Differential Thrust

Loop Shaping for Transparency and Stability Robustness in Time-Delayed Bilateral Telemanipulation

2004 ◽  
Vol 126 (3) ◽  
pp. 650-656 ◽  
Author(s):  
Kevin B. Fite and ◽  
Michael Goldfarb ◽  
Angel Rubio
Keyword(s):  
Time Delay ◽  
Communication Channels ◽  
Smith Predictor ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Stability Robustness ◽  
Loop Shaping ◽  
And Performance ◽  
Control Methodology

This paper presents a control methodology that provides transparency and stability robustness in bilateral telemanipulation systems that include a significant time delay in the communication channels. The method utilizes an adaptive Smith predictor to compensate for the time delay, and incorporates a previously published loop shaping approach to design a compensator for transparency and stability robustness of the loop. The method is experimentally demonstrated on a single degree-of-freedom telemanipulation system, and is shown to effectively provide stability and performance robustness.

scholarly journals Adaptive Differential Thrust Methodology for Lateral/Directional Stability of an Aircraft with a Completely Damaged Vertical Stabilizer

2018 ◽  
Vol 2018 ◽  
pp. 1-18
Author(s):  
Long K. Lu ◽  
Kamran Turkoglu
Keyword(s):  
Adaptive Control ◽  
Commercial Aircraft ◽  
Control Approach ◽  
Directional Stability ◽  
Fatal Crash ◽  
And Performance ◽  
The Stability ◽  
And Control ◽  
Model Reference Adaptive ◽  
Differential Thrust

This paper investigates the utilization of differential thrust to help a commercial aircraft with a damaged vertical stabilizer in order to regain its lateral/directional stability. In the event of an aircraft losing its vertical stabilizer, the consequential loss of the lateral/directional stability and control is likely to cause a fatal crash. In this paper, an aircraft with a completely damaged vertical stabilizer is investigated, and a unique differential thrust-based adaptive control approach is proposed to achieve a stable flight envelope. The propulsion dynamics of the aircraft is modeled as a system of differential equations with engine time constant and time delay terms to study the engine response time with respect to a differential thrust input. The proposed differential thrust control module is then presented to map the rudder input to differential thrust input. Model reference adaptive control based on the Lyapunov stability approach is implemented to test the ability of the damaged aircraft to track the model aircraft’s (reference) response in an extreme scenario. Investigation results demonstrate successful application of such differential thrust approach to regain lateral/directional stability of a damaged aircraft with no vertical stabilizer. Finally, the conducted robustness and uncertainty analysis results conclude that the stability and performance of the damaged aircraft remain within desirable limits and demonstrate a safe flight mission through the proposed adaptive control methodology.

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