System Identification of Fixed-wing UAV with Multi-segment Control Surfaces

Sattar, Abdul; Wang, Liuping; Abdel‐Rohman, Mohamed; Panta, Ashim; Fisher, Alex

doi:10.1109/anzcc47194.2019.8945775

Cited by 10 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This design challenge is complex but not impossible. There are also other means of mitigating turbulence and gusts through the control systems [80][81][82], aerodynamic configuration [68,[83][84][85][86], and novel sensors [66,67,87]. Counteracting such flow disturbances comes at the cost of increased weight and power demands which will affect range and battery consumption.…”

Section: Airframe Design and Certification Considerationsmentioning

confidence: 99%

“…In this case the UAV relies mainly on the rotary wings for lift and attitude control. There are opportunities for unconventional fixed wings designs to increase the control authority and rapidity [84,85], however the rotary wings will be required to achieve the majority of the control and lifting work in such scenarios, and therefore require the ability to rapidly adjust thrust to mitigate any gusts encountered. Variable-pitch propellers are effective in generating rapid actuation and more efficient thrust vectoring to enable the vehicle to approach a vertiport at low approach speeds with more control authority and stability.…”

Section: Airframe Design and Certification Considerationsmentioning

confidence: 99%

See 1 more Smart Citation

Gusts Encountered by Flying Vehicles in Proximity to Buildings

Abdel‐Rohman

Marino

Watkins

et al. 2022

Drones

Self Cite

View full text Add to dashboard Cite

There is a growing desire to operate Uncrewed Air Vehicles (UAVs) in urban environments for parcel delivery, and passenger-carrying air taxis for Advanced Air Mobility (AAM). The turbulent flows and gusts around buildings and other urban infrastructure can affect the steadiness and stability of such air vehicles by generating a highly transient relative flow field. Our aim is to review existing gust models, then consider gust encounters in the vicinity of buildings as experienced by flight trajectories over the roof of a nominally cuboid building in a suburban atmospheric boundary layer. Simplified models of fixed- and rotary-wing aircraft are used to illustrate the changes in lift and thrust experienced by flight around the building. The analysis showed that fixed-wing aircraft experienced a substantial increase in angle of attack over a relatively short period of time (<1 s) as they fly through the shear layer at a representative forward velocity, which can be well above typical stall angles. Due to the slow flight speeds required for landing and take-off, significant control authority of rotor systems is required to ensure safe operation due to the high disturbance effects caused by localized gusts from buildings and protruding structures. Currently there appears to be negligible certification or regulation for AAM systems to ensure safe operations when traversing building flow fields under windy conditions and it is hoped that the insights provided in this paper will assist with future certification and regulation.

show abstract

Section: Airframe Design and Certification Considerationsmentioning

confidence: 99%

Section: Airframe Design and Certification Considerationsmentioning

confidence: 99%

Gusts Encountered by Flying Vehicles in Proximity to Buildings

Abdel‐Rohman

Marino

Watkins

et al. 2022

Drones

Self Cite

View full text Add to dashboard Cite

show abstract

“…For conventional fixed-wing UAV having one aileron attached to each side of the main wing, many controllers have been developed and analyzed. A few examples include PID control, [21][22][23] sliding mode control, 24 back-stepping control, 25,26 backstepping and dynamic inversion combined control, 27,28 machine learning and hybrid control 29,30 and fuzzy logic control. 31,32 However, for the fixed-wing aircraft with multiple aileron segments, the MPC was deployed because of three major advantages: (i) Its excellent performance, which may primarily be affected by accuracy of the identified system model.…”

Section: Introductionmentioning

confidence: 99%

Disturbance rejection enhancement using predictive control for the fixed‐wing UAV with multiple ailerons

Sattar

Wang

Ansari

et al. 2023

Adaptive Control & Signal

Self Cite

View full text Add to dashboard Cite

Summary The performance of small fixed‐wing unmanned aerial vehicles (UAVs) is easily degraded by exogenous disturbances. In an attempt to improve the performance, the structural change is made in conventional small fixed‐wing UAV through segmentation of each aileron control surface into multiples. Detailed system identification experiments are performed on each aileron pair in the wind tunnel to acquire linear dynamic models for the roll attitude of the UAV. These experiments have provided the transfer functions for the aileron control surfaces based on corresponding frequency response. Three distinctive model predictive controllers are designed and deployed in real‐time hardware to achieve the roll attitude control. The roll attitude control experiments are validated in wind tunnel under both normal and turbulent environments. The results show that multiple input and single output control system provides significant improvement in the roll attitude and disturbance rejection performance. The collective actuation of multiple control surfaces improves roll stability by 10.1%$$ 10.1\% $$ to 67.87%$$ 67.87\% $$ when compared to the single aileron pair based conventional control in the presence of turbulent flight conditions.

show abstract

“…With regard to its great potential in wireless communication networks, the application of Unmanned aerial vehicle's (UAVs) in cellular networks is also a salient topic of study in industry and the academia. [2][3][4][5] Urbanization and innovation in UAV technology and applications have been successful in unpacking various new means of use, in particular, its unparalleled scalability and resilience in on-the-go and pseudo-permanent cellular communication systems. Its applications are further ramped up with the innovations in the daily usage scenarios.…”

Section: Introductionmentioning

confidence: 99%

Mathematical framework for 5G‐UAV relay

Khan

2021

Trans Emerging Tel Tech

View full text Add to dashboard Cite

Unmanned aerial vehicle's (UAVs) small size, long-lasting battery, and flexible trajectory have produced widespread applications in radio communication systems, especially its usage as a cellular tower (gNB) for 5G services. At the same time, the mmWave's enormous available bandwidth makes it the primary contender for next-generation communication networks. This article aims to synthesize and assess the usage of mmWave concurrently in backhaul and access links for amplify-and-forward (AF) relay installed on the UAV. A mathematical framework is developed for the received power of the user equipment (UE) obtained in relay path (gNB-UAV-UE) and direct path (gNB-UE) via; (i) free space, and (ii) log-distance path loss model. The International Telecommunication Union recommended city model is used to assess the likelihood for LoS and NLoS paths in four urban environments; (i) high-rise urban, (ii) dense urban, (iii) urban, and (iv) suburban. Furthermore, various parameters, that is, UAV's position and amplification factor are stipulated to optimize the efficiency of a UAV-based AF relay for enhanced users coverage.

show abstract

System Identification of Fixed-wing UAV with Multi-segment Control Surfaces

Cited by 10 publications

References 22 publications

Gusts Encountered by Flying Vehicles in Proximity to Buildings

Gusts Encountered by Flying Vehicles in Proximity to Buildings

Disturbance rejection enhancement using predictive control for the fixed‐wing UAV with multiple ailerons

Mathematical framework for 5G‐UAV relay

Contact Info

Product

Resources

About