[HTML][HTML] A semi-algebraic view on quadratic constraints for polynomial systems

T Cunis, H Pfifer - Automatica, 2024 - Elsevier
We show that quadratic constraints admit a semi-algebraic interpretation of dynamic
systems. This allows us to improve the analysis of polynomial systems under nonlinear …

Finite horizon analysis of autolanded aircraft in final approach under crosswind

F Biertümpfel, H Pfifer - Control Engineering Practice, 2022 - Elsevier
The paper presents a worst-case touchdown performance analysis of auto-landed aircraft
under complex wind disturbance. It takes advantage of the fact that the approaching aircraft …

Robust performance analysis for gust loads computation

A Knoblach - 2015 - elib.dlr.de
In the design process of modern aircraft, a comprehensive analysis of worst case structural
gust loads is imperative. Because this analysis requires to consider millions of cases, the …

Performance analysis of control allocation using data‐driven integral quadratic constraints

M Pusch, D Ossmann, H Pfifer - Advanced Control for …, 2022 - Wiley Online Library
A new method is presented for evaluating the performance of a nonlinear control allocation
system within a linear control loop. To that end, a worst‐case gain analysis problem is …

Finite horizon touchdown analysis of autolanded aircraft under crosswind

F Biertümpfel, H Pfifer - IFAC-PapersOnLine, 2021 - Elsevier
The paper presents a worst-case touchdown condition analysis of an autolanded aircraft
under crosswind. Aircraft dynamics are generally considered altitude-and speed-dependent …

Constrained Control for Load Alleviation in Very Flexible Aircraft

M De Freitas Virgilio Pereira - 2022 - deepblue.lib.umich.edu
Air travel has had an increasing contribution to global CO2 and non-CO2 emissions, and
climate change. Compelled by the need for a greener aviation industry, aircraft designs are …

Efficient determination of worst-case gust loads using system norms

A Knoblach, G Looye - Journal of Aircraft, 2017 - arc.aiaa.org
TO CERTIFYa new aircraft, it must be proved that it can withstand loads caused by
turbulence and gusts [1]. According to the certification regulations [2, 3], two types of …

Estimating the Region of Attraction of uncertain systems with Integral Quadratic Constraints

A Iannelli, P Seiler, A Marcos - 2018 IEEE Conference on …, 2018 - ieeexplore.ieee.org
A general framework for Region of Attraction (ROA) analysis is presented. The considered
system consists of the feedback interconnection of a plant with polynomial dynamics and a …

[PDF][PDF] Robustness analysis of linear time-varying systems with application to aerospace systems

F Biertümpfel - 2021 - researchgate.net
In recent years significant effort was put into developing analytical worst-case analysis tools
to supplement the Verification & Validation (V&V) process of complex industrial applications …

Hard constrained LPV virtual control with application to flutter suppression of a smart airfoil

AMH Al-Hajjar, SSM Swei, GG Zhu - International Journal of Control …, 2020 - Springer
Hard constrained control problems are popular in practical applications due to physical and
power limitations. For instance, the displacement of a linear actuator is finite. A lot of studies …