State Space Representation of the Open-Loop Dynamics of the Space Shuttle Main Engine

1991 ◽  
Vol 113 (4) ◽  
pp. 684-690 ◽  
Author(s):  
Ahmet Duyar ◽  
Vasfi Eldem ◽  
Walter C. Merrill ◽  
Ten-Huei Guo
Keyword(s):  
State Space ◽  
Linear Models ◽  
Space Shuttle ◽  
Open Loop ◽  
Space Representation ◽  
Structure Estimation ◽  
State Space Representation ◽  
Loop Dynamics ◽  
Main Engine ◽  
And Control

A parameter and structure estimation technique for multivariable systems is used to obtain state space representation of open loop dynamics of the space shuttle main engine (SSME). The parametrization being used is both minimal and unique. The simplified linear models may be used for fault detection studies and control system design and development.

scholarly journals On Bumps and Reduction of Switching Transients in Multicontroller Systems

2007 ◽  
Vol 2007 ◽  
pp. 1-17 ◽  
Author(s):  
Joseph J. Yamé ◽  
Michel Kinnaert
Keyword(s):  
State Space ◽  
Closed Loop ◽  
Open Loop ◽  
Space Representation ◽  
Control Loop ◽  
Minimal State ◽  
State Space Representation ◽  
Common Memory ◽  
Linear Controllers

This paper is concerned with the realization and implementation of multicontroller systems, consisting of several linear controllers, subject to the bump phenomenon which occurs when switching between one controller acting in closed loop and another controller in the set of “offline” controllers waiting to take over the control loop. Based on a deep characterization of the bump phenomenon, the paper gives a novel and simple parameterization of such set of linear controllers, possibly having different state dimensions, to cope with bumps and their undesirable transients in switched-mode systems. The proposed technique is based on a non minimal state-space representation allowing a common memory and a unique dynamics shared by all controllers in that set. It also makes each initially open-loop unstable controller run in a stable way regardless of whether that controller is connected to the controlled process.

scholarly journals Three-Dimensional Crane Modelling and Control Using Euler-Lagrange State-Space Approach and Anti-Swing Fuzzy Logic

2015 ◽  
Vol 9 (1) ◽  
pp. 5-13 ◽  
Author(s):  
Andrei Aksjonov ◽  
Valery Vodovozov ◽  
Eduard Petlenkov
Keyword(s):  
Fuzzy Logic ◽  
State Space ◽  
Three Dimensional ◽  
Space Representation ◽  
Future Research ◽  
State Space Representation ◽  
Complex Motor ◽  
Integral Controller ◽  
Proportional Integral Controller ◽  
And Control

Abstract The mathematical model of the three-dimensional crane using the Euler-Lagrange approach is derived. A state-space representation of the derived model is proposed and explored in the Simulink® environment and on the laboratory stand. The obtained control design was simulated, analyzed and compared with existing encoder-based system provided by the three-dimensional (3D) Crane manufacturer Inteco®. As well, an anti-swing fuzzy logic control has been developed, simulated, and analyzed. Obtained control algorithm is compared with the existing anti-swing proportional-integral controller designed by the 3D crane manufacturer Inteco®. 5-degree of freedom (5DOF) control schemes are designed, examined and compared with the various load masses. The topicality of the problem is due to the wide usage of gantry cranes in industry. The solution is proposed for the future research in sensorless and intelligent control of complex motor driven application.

Modeling, Actuation, and Control of an Active Fluid Vibration Isolator

1997 ◽  
Vol 119 (1) ◽  
pp. 52-59 ◽  
Author(s):  
M. J. Panza ◽  
D. P. McGuire ◽  
P. J. Jones
Keyword(s):  
Electrical Power ◽  
Fluid Pressure ◽  
Space Representation ◽  
Vibration Isolator ◽  
Mass System ◽  
Integral Control ◽  
Active Fluid ◽  
State Space Representation ◽  
In Series ◽  
And Control

An integrated mathematical model for the dynamics, actuation, and control of an active fluid/elastomeric tuned vibration isolator in a two mass system is presented. The derivation is based on the application of physical principles for mechanics, fluid continuity, and electromagnetic circuits. Improvement of the passive isolator performance is obtained with a feedback scheme consisting of a frequency shaped notch compensator in series with integral control of output acceleration and combined with proportional control of the fluid pressure in the isolator. The control is applied via an electromagnetic actuator for excitation of the fluid in the track connecting the two pressure chambers of the isolator. Closed loop system equations are transformed to a nondimensional state space representation and a key dimensionless parameter for isolator-actuator interaction is defined. A numerical example is presented to show the effect of actuator parameter selection on system damping, the performance improvement of the active over the passive isolator, the robustness of the control scheme to parameter variation, and the electrical power requirements for the actuator.

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