Gimbal Angle Restricted Control Moment Gyroscope Clusters

2009-06-13
Momentum envelopes for a cluster of four CMGs in pyramid mounting are obtained. The envelopes when gimbal travel is limited to plusmn90deg are also presented. CMG steering simulations using Moore Penrose pseudo inverse as well as blended inverse are presented, and success of the pre planned blended inverse in avoiding gimbal angle limits is demonstrated. Also given is a successful satellite slew maneuver example using blended inverse, showing the completion of the maneuver without violating gimbal angle travel restrictions.

Suggestions

Systematic Analysis on the Optical Properties of Chiral Metamaterial Slab for Microwave Polarization Control
Comez, I.; KARAASLAN, MUHARREM; Dincer, F.; KARADAĞ, FATOŞ; Sabah, C. (2015-05-01)
Theoretical and numerical of investigation of the chiral slab exhibiting polarization rotation is presented in detail. The effects of the chirality, thickness of medium, dielectric constant, and incident angle are analyzed in order to display the characteristic features of the chiral slab both for TE and TM incident waves. The chiral slab then is realized by using a full wave EM simulation software in order to validate the numerical results in which the numerical and simulation results are in good agreement...
Molecular Mechanics and Molecular Dynamics Simulations of Carbon Based Nanogears
Tasci, Emre; Erkoç, Şakir (American Scientific Publishers, 2009-04-01)
A system containing two nanogears and two nanotubes acting as shafts is designed. Then, it is checked to see whether it is a stable one by means of the molecular mechanics simulation. After it was ensured that the system was suitable for consideration, molecular dynamics were applied but from the results it was observed that the selected potential was not appropriate by itself alone and reconsideration showed that improvements were to be made. This resulted in introduction of an additional potential and the...
LONGITUDINAL ELASTIC-WAVE PROPAGATION AND ENERGY FLUX AT A DISCONTINUITY OF 2 DISSIMILAR SEMIINFINITE CIRCULAR RODS
Yıldırım, Raif Orhan (1994-10-01)
Elastic wave propagation through an area discontinuity of two dissimilar, bonded, semi-infinite circular rods is investigated analytically. In particular, the variations of the coefficients of stress reflection and transmission are determined in terms of the nondimensional cross sectional area and mechanical impedance parameters. The coefficients of energy flux reflection and transmission are also included. Then, the case is generalized to include a rigid mass attached at the discontinuity.
Elastoplastic deformations of rotating parabolic solid disks using Tresca's yield criterion
Eraslan, Ahmet Nedim (Elsevier BV, 2003-11)
Analytical solutions for the stress distribution in rotating parabolic solid disks are obtained. The analysis is based on Tresca's yield criterion, its associated flow rule and linear strain hardening. It is shown that, the deformation behavior of the convex parabolic disk is similar to that of the uniform thickness disk, but in the case of concave parabolic solid disk, it is different. In the latter, the plastic core consists of three different plastic regions with different mathematical forms of the yield...
Hierarchical and decentralized multitasking control of discrete event systems
Schmidt, Klaus Verner; Cury, José E. R. (2007-12-01)
In this paper, a hierarchical and decentralized approach for composite discrete-event systems (DES) that have to fulfill multiple tasks is elaborated. Colored marking generators that can distinguish classes of tasks are used as the system model, and a colored abstraction procedure as well as sufficient conditions for nonblocking and hierarchically consistent control are developed. It is shown that the computational complexity for supervisor computation is reduced. A flexible manufacturing system example dem...
Citation Formats
O. Tekinalp and İ. Yavrucuk, “Gimbal Angle Restricted Control Moment Gyroscope Clusters,” 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48654.