The development of a hybrid steering logic that maintains attitude tracking precision while avoiding hyperbolic internal singularities or escaping elliptic inherent to single-gimbal control moment gyroscopes is discussed. enables null motion and limits torque error when approaching singularity, it adds an external singularity. hybrid-steering-logic algorithm accomplishes these tasks through the definitions novel singularity metrics transition continuously from local-gradient pseudoinverse...

In this paper, an adaptive homography-based visual servo tracking controller is developed for the camera-in-hand problem using a quaternion formulation to represent rotation error. The desired trajectory in encoded by sequence of images (e.g., video sequence), and Lyapunov methods are employed facilitate control design stability analysis. An estimation law designed compensate lack unknown depth information. Experimental results provided demonstrate performance controller.

With the exception of CubeSat specification, design and development approaches have been mostly ad hoc, which has questioned their reliability. A systems engineering approach, based on guidelines NASA's Systems Engineering Handbook developed for CubeSats to facilitate systematic design, address reliability, traceability, reusability. The as a repeatable process, uses top-down methodology translate mission definitions into basic building blocks, components, interfaces tasks, that then...

This paper examines control of a general class uncertain nonlinear Euler-Lagrange systems with time-varying input delay and additive bounded disturbances. A Lyapunov-based stability analysis utilizing Lyapunov-Krasovskii functionals is provided to prove semi-global uniformly ultimately tracking. Simulation results demonstrate the robustness design respect delay.

In this paper, a μ controller is designed for satellite formation flying system around the Earth based on an uncertainty model derived from nonlinear relative position equation. model, nonzero eccentricity and varying semimajor axis are included as parametric uncertainties. J2 perturbation, atmospheric drag, actuation sensor noise bounded by functional The design nominal mission (an 800km altitude circular reference orbit) capable of achieving desired performance, robust to uncertainties,...

An Adaptive Arti cial Potential Function (AAPF) methodology for rapid path-planning of spacecraft autonomous proximity operations (POs) is developed and compared to the (APF). The AAPF method permits attractive potential with time dependent weights which are de ned by an adaptive update law. enables POs increased performance (e.g., respect fuel and/or time) reduce teleoperation in evolving environment. Two applications were simulated demonstrate AAPF: performing orbital maneuvers attitude...

In order to network small satellite constellations for Earth observation and communication, several limitations must be addressed, including distributed topology management, slow down-link data-rates, single point-to-point communication. Since exacerbate the severity of these limitations, thorough analysis a constellation's performance is required ensure that task objectives are achievable. this paper, we designed topologies using Satellite Toolkit (STK) two low orbit (LEO) observing...

Game theory methods have advanced various disciplines from social science, notably economics and biology, engineering. establishes an optimal strategy for multiple players in either a cooperative or noncooperative manner where the objective is to reach equilibrium state among players. A Stackelberg game involves leader follower that follow hierarchy relationship enforces its on follower. In this paper, general framework developed feedback control of Euler Lagrange system using open-loop...

The -oal of this ,.,,ork is to compare the performance response surface methodology (RSM) and t_t) types t)[ neural networks (NN) aid preliminary design el tv,'_) rocket cn,:ine_ components..\ data set _t --i.5 traillin,,v pOllats ,.lnd -'0 rest points, obtained from it semi-empirical model based on '.hree _ariablcs.is useci tbr a _,hcar ci_axial inlcdtl_r clement.Data for supersonic turbine tm :,ix xariabies.76 training tll]d 15 It:',[ ,._J,.lta ,)Dl_lil]ed chosen reflect importance t)t'...

Previous homography-based visual servo controllers have been developed using an error system that contains a singularity resulting from the representation of rotation matrix. For some aerospace applications such as control satellites or air vehicles, introduced by may be restrictive. To eliminate this singularity, controller is in paper based on composed unit quaternion representation. The proposed adaptive regulates camera to desired position and orientation determined image. A...

Among the size, weight and power constraints imposed by CubeSat specification, limitation associated with can be addressed through a distributed computing architecture. This paper describes such architecture its operational design in form of command data handling system telemetry formulation, adapted for whose requirements proving mission are significantly larger than on-orbit average generated. The 1U objective precision three axes attitude control is composed low flight computer high...

A testbed for quantifying the accuracy of a coarse Sun sensing system composed analog sensors was constructed. The is intended pico-satellites requiring attitude determination. Approach and results rst iteration are discussed. exposed some complications which arise from using sensors, specically sensor prole, calibration, saturation issues.

Neural network and polynomial-based techniques are applied to. process aerodynamic data obtained fi-om computational simulations for flows around a generic threedimensional wing/blade twodimensional airfoil. The main purpose of this study is to offer insight into developing appropriate supporting engineering design op-on by considering small sets (between 9 25 simulations) larger set (up 765 simulations). Relative performances radial-basis back-propagation networks, iechaiw Compared. For...

Abstract NOTE: The first page of text has been automatically extracted and included below in lieu an abstract Main Menu Session 2142 Maintaining Industry Partnerships Integrated Product Process Design Education Norman Fitz-Coy, David W. Mikolaitis, R. Keith Stanfill, Loc Vu-Quoc University Florida Department Aerospace, Engineering Mechanics Science / Science/ Industrial Systems (IPPD) faculty have become expert at teaching multidisciplinary design (9 fields expertise) cultivating industry...

The increasingly cluttered environment in space is placing a premium on future spacecraft and satellites that are capable of tracking estimating the trajectory unknown debris autonomously without consistent communication with ground stations. In this paper, vision-based trajectory–tracking method close proximity presented using two cameras onboard formation. To differentiate target from other clutters, data-association technique investigated. A two-stage nonlinear robust controller developed...

This paper provides a comprehensive discussion on the benefits and technical challenges of controlling over-determined over-actuated excitation systems ranging from 1-DOF to 6-DOF. The primary result physical constraints imposed when number exciters exceeds mechanical degree-of-freedom. issue is less critical for electro-dynamic which tend be more compliant than servo-hydraulic exciters. To facilitate discussion, generalized methods determining drive output commands actuator input transform...