Derivation of the Dynamics Equations of Receiver Aircraft in Aerial Refueling

Waishek, Jayme; Dogan, Atilla; Blake, William

doi:10.2514/1.35892

Cited by 66 publications

(23 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 The equations were implemented in an integrated simulation environment with a feedback controller for receiver station-keeping. Overviews of the receiver aircraft equations of motion, non-uniform wind effect modeling, and the controller developed to maintain a specified trajectory relative to the tanker, are presented in the following subsections.…”

Section: Formation Modeling and Trajectory Tracking Controllermentioning

confidence: 99%

Aircraft Lateral Trim Using Internal Fuel Transfer & Differential Thrust In Formation Flight

Okolo

Dogan²,

Blake

2011

AIAA Atmospheric Flight Mechanics Conference

Self Cite

View full text Add to dashboard Cite

This paper investigates alternative moment generation mechanisms for aircraft as fuelsaving techniques in formation flight. Aircraft flight generates wake vortices that induce a nonuniform wind distribution in the wake of the aircraft. A follower aircraft, flying in the wake of the leader aircraft, can experience induced wind components and gradients with various magnitudes and directions, depending on the location within the induced nonuniform wind field. It has been demonstrated that there is a "sweet spot" within the wake of the leader aircraft where the follower aircraft experiences upwash, which leads to drag reduction. When an aircraft flying in formation flight is at the "sweet spot", the aircraft experiences lower drag but at the same time experiences induced aerodynamic moments. The deflections of control effectors required for trimming the aircraft under the effect of these moments induce additional drag, which reduce the benefits of fuel efficiency. This report investigates two different mechanisms of moment generation for alleviating the drag induced by the deflection of the control effectors: (1) internal fuel transfer among fuel tanks and (2) differential thrust. It was seen that an elimination of the control effector deflections led to a reduction in the thrust required and thus savings in fuel. Internal fuel transfer, in the configuration studied, was seen to reduce the aileron deflection of the follower by generating a rolling moment, and differential thrusting reduced the rudder deflection by the generation of a yawing moment. Furthermore, the combination of the two techniques provided the highest fuel savings of 11 percent by reducing the need for the aileron and rudder deflections. The results of this analysis will allow for further studies ultimately leading to the development of a fuel-saving method of flight with various applications.

show abstract

Section: Formation Modeling and Trajectory Tracking Controllermentioning

confidence: 99%

Aircraft Lateral Trim Using Internal Fuel Transfer & Differential Thrust In Formation Flight

Okolo

Dogan²,

Blake

2011

AIAA Atmospheric Flight Mechanics Conference

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerical values for some of the airship physical parameters are given in Table 1. The equations of motion presented here are based on the methodology presented in [19][20][21]. The derivation is omitted here for brevity; however, a detailed one can be found in [22].…”

Section: Equations Of Motionmentioning

confidence: 99%

“…The state estimates and the error covariance are updated every time a measurement is obtained using the Kalman gain from Equation (21). From the measurement model, it is seen that the Jacobian…”

Section: P(t) = Fp(t) + P(t)fmentioning

confidence: 99%

Guidance, Navigation and Control of Unmanned Airships under Time-Varying Wind for Extended Surveillance

Atmeh

Subbarao

2016

Aerospace

View full text Add to dashboard Cite

This paper deals with the control of lighter-than-air vehicles, more specifically the design of an integrated guidance, navigation and control (GNC) scheme that is capable of navigating an airship through a series of constant-altitude, planar waypoints. Two guidance schemes are introduced, a track-specific guidance law and a proportional navigation guidance law, that provide the required signals to the corresponding controllers based on the airship position relative to a target waypoint. A novel implementation of the extended Kalman filter, namely the scheduled extended Kalman filter, estimates the required states and wind speed to enhance the performance of the track-specific guidance law in the presence of time-varying wind. The performance of the GNC system is tested using a high fidelity nonlinear dynamic simulation for a variety of flying conditions. Representative results illustrate the performance of the integrated system for chosen flight conditions.

show abstract

“…This chapter includes presentation of the matrix-form set of nonlinear, Six Degree of Freedom (6-DOF), rigid body Equations Of Motion (EOM) developed in earlier research [5][6][7][8], followed by a detailed reference of the disturbance rejection technique [20] to be employed as a candidate improvement to the existing control law and simulation. In order to realize the EOM for both the receiver and tanker air vehicles, the set of frames used to describe the bodies requires definition.…”

Section: Chapter 2 Detailed Problem Descriptionmentioning

confidence: 99%

“…Ref. [5][6][7][8] derives the receiver equations of motion with respect to a non-inertial frame. The non-inertial frame considered is the accelerating tanker body, which facilitates an intuitive control approach to tracking relative position between the receiver and the tanker.…”

mentioning

confidence: 99%

Derivation of the Dynamics Equations of Receiver Aircraft in Aerial Refueling

Cited by 66 publications

References 41 publications

Aircraft Lateral Trim Using Internal Fuel Transfer & Differential Thrust In Formation Flight

Aircraft Lateral Trim Using Internal Fuel Transfer & Differential Thrust In Formation Flight

Guidance, Navigation and Control of Unmanned Airships under Time-Varying Wind for Extended Surveillance

Improving Receiver Station-Keeping in Aerial Refueling by Formulating Tanker Motion as Disturbance

Contact Info

Product

Resources

About