Control synthesis for spinning aerospace vehicles.
Linear and nonlinear attitude control law synthesis for spinning aerospace vehicles, including analog simulation for control designs based on frequency symmetry
SATELLITE ATTITUDE CONTROL↗
SEARCH · Engineering Papers
Results for “Spin dynamics”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Spin-matrix polynomial development of the Hamiltonian for a free particle of arbitrary spin and mass.
Hamiltonian for free particle of arbitrary spin and mass formulated in terms of spin matrix polynomials, noting independence of expansion coefficients
SPIN DYNAMICS↗
Solar oblateness and moon precession.
Lunar orbit precession due to quadrupole moment of sun arising from solar oblateness
LUNAR ORBIT↗
The dynamics and optimal control of spinning spacecraft and movable telescoping appendages, part A
The problem of optimal control with a minimum time criterion as applied to a single boom system for achieving two axis control is discussed. The special case where the initial conditions are such that the system can be driven to the equilibrium state with only a single switching maneuver in the bang-bang optimal sequence is analyzed. The system responses are presented. Application of the linear regulator problem for the optimal control of the telescoping system is extended to consider the effects of measurement and plant noises. The noise uncertainties are included with an application of the estimator - Kalman filter problem. Different schemes for measuring the components of the angular velocity are considered. Analytical results are obtained for special cases, and numerical results are presented for the general case.
Bainum, P. M.↗
Transport simulation of processing spin distribution across semiconductor heterojunctions
Explore the source record for details and available documents.
spin dynamics diffusion semiconductor heterojuncti↗
Nutation and precession control of the High Energy Solar Physics (HESP) satellite
The High Energy Solar Physics (HESP) spacecraft is an intermediate class satellite proposed by NASA to study solar high-energy phenomena during the next cycle of high solar activity in the 1998 to 2005 time frame. The HESP spacecraft is a spinning satellite which points to the sun with stringent pointing requirements. The natural dynamics of a spinning satellite includes an undesirable effect: nutation, which is due to the presence of disturbances and offsets of the spin axis from the angular momentum vector. The proposed Attitude Control System (ACS) attenuates nutation with reaction wheels. Precessing the spacecraft to track the sun in the north-south and east-west directions is accomplished with the use of torques from magnetic torquer bars. In this paper, the basic dynamics of a spinning spacecraft are derived, control algorithms to meet HESP science requirements are discussed and simulation results to demonstrate feasibility of the ACS concept are presented.
Jayaraman, C. P.↗
Complex Eigenvalue Solution to a Spinning Skylab Problem
Effect of rotation on structural and dynamic behavior of spinning body with flexible appendages, and application to Skylab Apollo telescope mount and orbital workshop
Patel, J. S.↗
Transonic wind-tunnel measurements of some dynamic longitudinal and directional stability parameters for a finned spinning body of revolution having a high fineness ratio
Dynamic longitudinal and directional stability parameters for spinning body of revolution with high fineness ratio, at transonic speeds
DYNAMIC STABILITY↗
Calibration of the spin-scan ozone imager aboard the dynamics Explorer 1 satellite
The calibration technique, which contains the calibrated backscattered radiance values necessary for performing the calibrations, is presented. The calibration constants for September to October 1981 to determine total columnar ozone from the Spin-Scan Ozone Imager (SOI), which is a part of the auroral imaging instrumentation aboard the Dynamics Explorer 1 Satellite, are provided. The precision of the SOI-derived total columnar ozone is estimated to be better than 2.4 percent. Linear regression analysis was used to calculate correlation coefficients between total columnar ozone obtained from Dobson ground stations and SOI which indicate that the SOI total columnar ozone determination is equally accurate for clear or cloudy weather conditions.
Bressette, Walter E.↗
Stabilizing a spinning Skylab
The results are presented of a study of the dynamics of a spinning Skylab space station. The stability of motion of several simplified models with flexible appendages was investigated. A digital simulation model that more accurately portrays the complex Skylab vehicle is described, and simulation results are compared with analytically derived results.
Seltzer, S. M.↗
Passive stability of a spinning Skylab
The results of an analytical investigation of the rotational dynamics of a spinning Skylab space station are presented. The passive stability of motion of a simplified model consisting of a rigid core body with two attached flexible appendages is investigated. The parameter plane stability technique is applied to the specific Skylab case to determine its transient response to external disturbances.
Seltzer, S. M.↗
Passive stability of a spinning Skylab.
The results of an analytical investigation of the rotational dynamics of a spinning Skylab space station are presented. The passive stability of motion of a simplified model consisting of a rigid core body with two attached flexible appendages is investigated. The parameter plane stability technique is applied to the specific Skylab case to determine its transient response to external disturbances.
Seltzer, S. M.↗
Spin axis bearings Summary report
Dynamic testing and failure analyses of spin axis bearings in gyro assemblies for spacecraft guidance system applications
SPACECRAFT GUIDANCE↗
Stabilizing a spinning Skylab.
This paper presents the results of a study of the dynamics of a spinning Skylab space station. The stability of motion of several simplified models with flexible appendages was investigated. A digital simulation model that more accurately portrays the complex Skylab vehicle is described, and simulation results are compared with analytically derived results.
Seltzer, S. M.↗
An analytical technique for the analysis of airplane spin entry and recovery
The dynamic equations of motion for a spinning airplane are simplified to facilitate the analysis of spin entry and recovery maneuvers. Solutions of a nonlinear, first order equation for spin rate enable calculation of spin entry and recovery times and control required for recovery. The analysis is applied to a light airplane for which both aerodynamic data, rotory balance wind tunnel tests, and spin flight test data have been obtained. A comparison of predicted and actual transient spin responses is made which supports the validity of the analytical approach taken but which also illustrates the difficulty in obtaining accurate aerodynamic data for spinning airplanes. Certain normalized parameters of the reduced state spin equation suggest criteria for assessing the transient spin characteristics of light airplanes.
Taylor, L. W., Jr.↗
Prediction of propellant behavior in spinning flow of a space motor
A model for 2-phase flow dynamics in a spinning spherical rocket motor, developed for the Ofeq satellite program, is based on the sectional approach to solution of the flow equations. An experimental model was built, to enable the motion of the aluminum/aluminum-oxide particles resulting from combustion within a solid-fuel motor to be simulated by injected paraffin droplets. The injected droplets included under-5 micrometer droplets which move with the gas stream and larger droplets, averaging 20 micrometer diameter, which simulate the motion of aluminum particles. The test chamber comprised a pair of cylindrical pyrex tubes with a sharp contraction in diameter, rotated at various speeds by a frequency-controllable motor. An optical system, based on a 5 W argon ion laser with a beam splitter and frequency shifter, mounted on a movable table, facilitated sectional measurements of the three velocity components and determination of size-velocity relationships. Preliminary results indicate that the effect of rotation on axial velocity is negligible, while its effect on tangential velocity approximates to solid-body rotation.
Gany, A.↗
Some observations on spin detector response during Galileo high gain antenna deployment
This paper summarizes a dynamic analysis conducted in support of the investigation of the anomalous deployment of the Galileo High Gain Antenna on April 11, 1991. The work was focused on modeling the spacecraft spin dynamics to predict and compare the spin detector telemetry during the antenna deployment for possible cause scenarios. The effects of analog and digital low-pass filtering, digitization, and telemetry on the reported spin rate were studied as well. The high frequency phenomena in the spin detector response are masked by the filtering and sampling of the telemetry data. However, the observed spin detector telemetery is consistent with a single rib popping free, and is most likely associated with a rib near the spin detector, or 180 deg opposite.
Peng, Chia-Yen↗