# Improved Transient Response in Adaptive Control Using Projection Algorithms and Closed Loop Reference Models

@inproceedings{Gibson2012ImprovedTR, title={Improved Transient Response in Adaptive Control Using Projection Algorithms and Closed Loop Reference Models}, author={Travis E. Gibson and Anuradha M. Annaswamy and Eugene Lavretsky}, year={2012} }

This paper explores the properties of adaptive systems with closed–loop reference models. Historically, reference models in adaptive systems run open–loop in parallel with the plant and controller, using no information from the plant or controller to alter the trajectory of the reference system. Closed–loop reference models on the other hand use information from the plant to alter the reference trajectory. Using the extra design freedom available in closed–loop reference models, we design… Expand

#### 51 Citations

Adaptive Systems with Closed-loop Reference Models: Stability, Robustness and Transient Performance

- Mathematics, Computer Science
- 2012

Using additional design freedom available in closed-loop reference models, new adaptive controllers are designed that are stable, and have improved transient properties. Expand

Application of adaptive control with closed-loop reference models to a model aircraft with actuator dynamics and input uncertainty

- Engineering, Computer Science
- 2015 American Control Conference (ACC)
- 2015

Simulation results on a nonlinear plant with actuator dynamics and sensor models indicate that the CRM adaptive controller provides additional robustness to plant uncertainties and unmodeled dynamics compared to the classical MRAC architecture, where an open-loop reference model is employed. Expand

Adaptive Systems with Closed-Loop Reference Models: Composite Control and Observer Feedback

- Computer Science, Engineering
- ALCOSP
- 2013

It is shown that the introduction of CRM in Combined direct and indirect Model Reference Adaptive Control (CMRAC) leads to significant improvement in their transient response as well and that CRM allow stable feedback of noise-free state estimates in CMRAC. Expand

Adaptive systems with closed-loop reference-models, part I: Transient performance

- Computer Science
- 2013 American Control Conference
- 2013

This paper explores the transient properties of direct model reference adaptive control with closed loop reference models and both Euclidean and L2 norms are used to characterize this transient behavior. Expand

On Adaptive Control With Closed-Loop Reference Models: Transients, Oscillations, and Peaking

- Computer Science, Mathematics
- IEEE Access
- 2013

This paper quantifies both the transient performance in the classical adaptive systems and their improvement with closed-loop reference models and proposes an optimal design of CRMs that minimizes an underlying peaking phenomenon. Expand

Adaptive output-feedback control for relative degree two systems based on closed-loop reference models

- Engineering, Computer Science
- 2015 54th IEEE Conference on Decision and Control (CDC)
- 2015

The overall design guarantees robust stability and tracking performance in the presence of parametric uncertainties that are commonly seen in aircraft applications. Expand

Adaptive Output-Feedback Control with Closed-Loop Reference Models for Very Flexible Aircraft

- Engineering
- 2016

This paper proposes a model reference adaptive controller for a class of multi-input/multi-output plants where the number of outputs is larger than the number of inputs: an example of which is very… Expand

Transients in output feedback adaptive systems with observer-like reference models

- Computer Science
- 2015

It is shown that employing observer-like reference models in MRAC leads to a trade-off between achieving fast transient dynamics and using large error feedback gains in the modified reference model. Expand

Output feedback adaptive control in the presence of unmodeled dynamics

- Computer Science
- 2013

An approach for designing an adaptive output feedback controller that augments an assumed existing observer based linear controller that is applicable to non-minimum phase systems and adaptive to the presence of matched unmodeled dynamics. Expand

Robust closed loop reference MRAC with PI compensator

- Engineering
- 2016

Adaptive controllers with closed loop reference models have guaranteed transient performance due to the additional design freedom available in them. However, robustness in the presence of both… Expand

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