Airborne Lidar for Automatic Feedforward Control of Turbulent In-Flight Phenomena

Rabadan, Guillermo Jenaro; Schmitt, Nikolaus P.; Pistner, Thomas; Rehm, Wolfgang

doi:10.2514/1.44950

Cited by 51 publications

(50 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The circular fringe pattern is then analyzed for the radius change due to Doppler shift. During the flight tests on Airbus' A340 test aircraft, wind speed dispersions of around 1.5 m s À1 at 50 m range for a flight altitude of 39 kft could be demonstrated (Rabadan et al 2010), in line with the requirements of automatic control for gust load alleviation.…”

Section: Direct Detection Doppler Lidarsupporting

confidence: 62%

Aviation Turbulence

2016

View full text Add to dashboard Cite

Section: Direct Detection Doppler Lidarsupporting

confidence: 62%

Aviation Turbulence

2016

View full text Add to dashboard Cite

“…Two types of sensors are currently available to provide the leadtime reference signal; the first type is the light detection and ranging (LIDAR) sensor [17,18]. As an airborne forward-looking sensor, a LIDAR sensor has the ability to detect atmospheric turbulence ahead of the airplane.…”

Section: Introductionmentioning

confidence: 99%

Gust Load Alleviation on a Large Transport Airplane

Zhao

Yue

2016

Journal of Aircraft

View full text Add to dashboard Cite

This study develops an active control technology to reduce the incremental dynamic loads of a large four-engine transport airplane flying through a gust field. The mathematical model of the proposed gust-alleviation system features composite structural motions (for example, rigid-body motions, elastic vibrations, and deflections of control surfaces) and unsteady aerodynamic forces induced by the structural motions and the gusts. A clear outline of the procedure is first provided to determine the aeroservoelastic equation of the system. Then, an adaptive feedforward controller that uses the preview information of the gust sensed by an onboard alpha probe is designed to operate the ailerons symmetrically to alleviate the wing-root bending moment induced by the gust. The rigid-body motions due to travelling gusts are also compensated for using symmetrical deflections of the elevators. To solve the problems of weight drift and weight bias that are commonly encountered in adaptive control, the circular leaky least meansquared algorithm is applied to update the weights of the adaptive controller. The simulation results show that a large transport airplane equipped with the proposed gust-alleviation system experiences a significantly lower wing-root bending moment in both stationary and nonstationary gusty environments.

show abstract

“…For these airborne-related applications, a third approach could be the installation of forward-looking measurement devices onboard an aircraft. Such measurement devices like a lidar (see e.g., [3,4]) have the major drawback that the scanning domain is relatively large, which requires considerable computational power.…”

Section: Introductionmentioning

confidence: 99%

New Concept for Wake-Vortex Hazard Mitigation Using Onboard Measurement Equipment

Feuerle

Steen

Hecker

2015

Journal of Aircraft

View full text Add to dashboard Cite

Wake-vortex hazards are a huge threat in aviation. These hazards are well accepted in the vicinity of airports (both departure and arrival). But also a number of en route incidents have happened in the past. Current wake-vortex mitigation strategies are based on static distances (in space and/or time). In future air traffic management concepts of Single European Sky Air Traffic Management Research and NextGen, these static distances will be replaced by dynamic separation strategies. Furthermore, concepts for self-separation of aircraft are described. This paper will discuss the work at Technische Universität Braunschweig, where a new concept for wake-vortex hazard mitigation has been developed. The basic idea of the new concept is that only a criticality parameter will be transmitted between aircraft to ensure a safe separation even within new self-separation concepts. The criticality parameter will give an indication about the severity (and therefore criticality to the following aircraft) of the vortices. Additionally, Technische Universität Braunschweig will install wind-turbulence measurement equipment onboard its research aircraft. This installation will be also be described, and the possible usage will be discussed.

show abstract

Airborne Lidar for Automatic Feedforward Control of Turbulent In-Flight Phenomena

Cited by 51 publications

References 10 publications

Aviation Turbulence

Aviation Turbulence

Gust Load Alleviation on a Large Transport Airplane

New Concept for Wake-Vortex Hazard Mitigation Using Onboard Measurement Equipment

Contact Info

Product

Resources

About