Stability Properties and Cross Coupling Performance of the Control Allocation Scheme CAPIO

Yıldız, Yıldıray; Kolmanovsky, Ilya

doi:10.2514/6.2010-3474

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…To induce actuator saturations easily, we consider a low-speed flight case, Mach 0.22, where the control surface efficiency is poor. The state matrix and control strategy were given in [16,17] In order to induce all the actuator saturations, both aggressive pitch command and lateral command are received by the pilot in the task. In this simulation, we track a pitch angle reference at t=3s and a roll angle rate reference from t=0.5s to t=4.5s.…”

Section: B Mimo Systemmentioning

confidence: 99%

A phase compensator to prevent pilot induced oscillations by actuator rate limiting

Tan

2014

The 2014 2nd International Conference on Systems and Informatics (ICSAI 2014)

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In modern fly-by-wire control system, pilot induced oscillations (PIOs) have long been an aviation safety problem. The violation of actuator rate saturation is known to be a leading cause of PIO and has long been linked with performance and stability degradation of an aircraft. This paper proposes a phase compensator designed to reduce the adverse effects of rate saturation of the control surfaces. Without changing the structure of original control scheme in the design process, this proposed phase compensator reduces the effective time delay by minimizing the error of derivatives between the commanded input signal and the actual input signal, as well as minimizing the error of altitudes between these two signals. Simulations on the pilot-aircraft closed-loop system model with rate limiter are used to check the properties of the designed compensator. The pitch angle and roll angle rate commands, which are easy to induce PIO to a pilot, are chosen as references. Results from the simulation evaluation demonstrate that this compensator has good capability of decreasing the occurrence possibility of PIO, including the severity and duration of PIO, introduced by control surface rate limiting.

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Section: B Mimo Systemmentioning

confidence: 99%

A phase compensator to prevent pilot induced oscillations by actuator rate limiting

Tan

2014

The 2014 2nd International Conference on Systems and Informatics (ICSAI 2014)

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“…10 The Control Allocation technique to recover from Pilot Induced Oscillations (CAPIO) is one of the first known techniques to address the problems that arise from stringent actuator rate limits for multi-input, multi-output applications without the use of ganging. 11,12,13 In this paper, CAPIO is presented along with piloted simulation results of its effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Motion-Based Piloted Simulation Evaluation of a Control Allocation Technique to Recover from Pilot Induced Oscillations

Craun

Acosta

Beard

et al. 2013

AIAA Guidance, Navigation, and Control (GNC) Conference

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This paper describes the maturation of a control allocation technique designed to assist pilots in the recovery from pilot induced oscillations (PIOs). The Control Allocation technique to recover from Pilot Induced Oscillations (CAPIO) is designed to enable next generation high efficiency aircraft designs. Energy efficient next generation aircraft require feedback control strategies that will enable lowering the actuator rate limit requirements for optimal airframe design. One of the common issues flying with actuator rate limits is PIOs caused by the phase lag between the pilot inputs and control surface response. CAPIO utilizes real-time optimization for control allocation to eliminate phase lag in the system caused by control surface rate limiting. System impacts of the control allocator were assessed through a piloted simulation evaluation of a non-linear aircraft simulation in the NASA Ames Vertical Motion Simulator. Results indicate that CAPIO helps reduce oscillatory behavior, including the severity and duration of PIOs, introduced by control surface rate limiting.

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Implementation of CAPIO for Composite Adaptive Control of Cross-Coupled Unstable Aircraft

Yıldız

Kolmanovsky

2011

Infotech@Aerospace 2011

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This paper presents an implementation of a recently developed control allocation algorithm CAPIO (a Control Allocation technique to recover from Pilot Induced Oscillations) for composite adaptive control of an inertially cross coupled unstable aircraft. When actuators are rate-saturated due to either an aggressive pilot command, high gain of the flight control system or some anomaly in the system, the effective delay in the control loop may increase due to the phase shifting between the desired and the achieved system states. This effective time delay may deteriorate the performance or even destabilize the system in some cases, depending on the severity of rate saturation. CAPIO reduces the effective time delay by minimizing the phase shift between the commanded and the actual attitude accelerations. We present simulation results for an unstable aircraft with cross-coupling controlled with a composite adaptive controller in the presence of rate saturation. The simulations demonstrate the potential of CAPIO serving as an effective rate saturation compensator in adverse conditions.

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Stability Properties and Cross Coupling Performance of the Control Allocation Scheme CAPIO

Cited by 4 publications

References 12 publications

A phase compensator to prevent pilot induced oscillations by actuator rate limiting

A phase compensator to prevent pilot induced oscillations by actuator rate limiting

Motion-Based Piloted Simulation Evaluation of a Control Allocation Technique to Recover from Pilot Induced Oscillations

Implementation of CAPIO for Composite Adaptive Control of Cross-Coupled Unstable Aircraft

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