Longitudinal Absolute Stability of a BWB Aircraft-Pilot System with Saturated Actuator Model
Journal Title: INCAS BULLETIN - Year 2013, Vol 5, Issue 3
Abstract
This paper deals with the analysis of the P(ilot) I(n-the-Loop) O(scillations) of the second category (with rate and position liming in the closed loop pilot-vehicle system), caused by the dynamic coupling between the human pilot and the aircraft. The analysis is made in the context of the longitudinal motion and the theoretical model of the airplane presented in this article is a (B)lended (W)ing (B)ody tailless configuration. In what concerns the human operator, this is expressed by the Synchronous Pilot Model, which is represented by a simple gain, without a specific delay. The Routh-Hurwitz criterion is used in order to analyze the longitudinal stability of the low-order pilot-airplane system without the influence of actuator nonlinearity (this means that the unsaturated actuator model is employed for the mentioned algebraic criterion). Most emphasis is put on the frequency Popov criterion, which is used to investigate the absolute stability property of the short-period model in the presence of the actuator rate saturation, in the condition of the Lurie problem. The transfer function of the longitudinal BWB model, obtained from open-loop analysis, has a double pole at the origin and, for the absolute stability feedback structure that contains the nonlinearity of the saturation type, the Popov frequency-domain inequalities are applied to the PIO II problem in this critical case.
Authors and Affiliations
Claudia Alice STATE
Keywords
Related Articles
- EP ID EP156879
- DOI 10.13111/2066-8201.2013.5.3.12
- Views 101
- Downloads 0
Automated Conflict Resolution in Air Traffic Management
Collision prevention strategy in ATM is not only a short-term coordination between safety and efficiency, but also a long-term planning for national policy of airspace and air transportation system. The optimization of s...
Aerodynamic Analysis of C-Wing Aircraft
In the recent years, the researchers focused on the development of long-range aircraft with the commercial aid of nonconventional design concepts. The C-wing concepts for large aircraft are highly preferred to overcome t...
Vibration Energy Harvesting Potential for Turbomachinery Applications
The vibration energy harvesting process represents one of the research directions for increasing power efficiency of electric systems, increasing instrumentation nodes autonomy in hard to reach locations and decreasing t...
Drag coefficient modelling in the context of small launcher optimisation
The purpose of this paper is to present a fast mathematical model that can be used to quickly asses the drag coefficient for generic launcher configurations. The tool developed based on this mathematical model can be use...
Subsonic Jet Pump Comparative Analysis
The paper presents the numerical and experimental studies carried out to optimize, from an aerodynamic point of view, a subsonic jet pump used on aircraft. The optimization of the subsonic jet pump will be done from the...