Quadratically Parameterized Root Locus Analysis

2014 ◽  
Vol 59 (7) ◽  
pp. 1803-1817 ◽  
Author(s):  
Brandon J. Wellman ◽  
Jesse B. Hoagg
Keyword(s):  
Root Locus ◽  
Root Locus Analysis

Root-Locus Analysis of Structural Coupling in Control Systems

1959 ◽  
Vol 26 (2) ◽  
pp. 205-209
Author(s):  
R. H. Cannon
Keyword(s):  
Control System ◽  
Control Systems ◽  
Natural Frequency ◽  
Feedback System ◽  
Structural Member ◽  
Root Locus ◽  
Structural Coupling ◽  
Root Locus Analysis ◽  
Platform System ◽  
System Characteristics

Abstract When a feedback system is devised to control a mechanical member that is structurally limber, unstable (“self-excited”) vibrations may be encountered at approximately a natural frequency of the structural member. Cures are generally easy to effect once the phenomena are understood. Two interesting cases are described: ground vibrations of an airplane control system due to a limber fuselage, and vibrations of a stable platform system due to limberness in the platform structure. The investigations are carried out using the root-locus technique, which provides a plot of system characteristics as explicit functions of control strength. In the case of the stable platform, the analysis is found to be more reliable than physical intuition.

scholarly journals An Improved Power Controller For A Single Phase Grid Connected Inverter With Root Locus Analysis

2009 ◽  
Vol 14 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Élcio Precioso de Paiva ◽  
João Batista Vieira Júnior ◽  
Luiz Carlos de Freitas ◽  
Valdeir José Farias ◽  
Ernane Antônio Alves Coelho
Keyword(s):  
Single Phase ◽  
Root Locus ◽  
Power Controller ◽  
Root Locus Analysis ◽  
Grid Connected Inverter

scholarly journals Root-Locus Analysis of Delayed First and Second Order Systems

Enfoque UTE ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 69-76
Author(s):  
Moisés Ríos Flores ◽  
J.F. Marquez-Rubio ◽  
B. Del Muro-Cuellar ◽  
E. Aranda-Bricaire
Keyword(s):  
Linear System ◽  
Second Order ◽  
Computational Method ◽  
Root Locus ◽  
Delayed Systems ◽  
Finite Dimensional ◽  
Locus Method ◽  
Root Locus Analysis ◽  
Second Order Systems ◽  
Low Order

For finite dimensional linear system the root-locus method is well established however for the case of delayed systems the method has some problems due to the transcendental term involved. This work intends to illustrate the problems that arises when a root-locus diagram is performed as well as to develop a Matlab function that provides the root-locus diagram for delayed low order systems. In this way, some comments about the problems that should be tackled to obtain a generalization of the computational method for delayed systems with real m poles and n zeros

Dynamic Redesign of a Flow Control Servo-Valve Using a Pressure Control Pilot

2001 ◽  
Author(s):  
Perry Y. Li
Keyword(s):  
Steady State ◽  
Flow Control ◽  
Dynamic Performance ◽  
Pressure Control ◽  
Design Parameters ◽  
Essential Dynamics ◽  
Analysis Method ◽  
Root Locus ◽  
Servo Valve ◽  
Root Locus Analysis

Abstract In this paper, the dynamic performance of an unconventional two-spool flow control servo valve using a pressure control pilot is analyzed. Such valves are less expensive than typical servo-valves but also tend to be limited in their dynamic performance. Based on a previously developed eight state nonlinear model, we develop a simplified linear model which is able to capture the essential dynamics of the valve. Using root locus analysis method, the limitation in dynamic performance is shown to be due to a “zero” introduced by the structure of the interconnection of the subsystems. Design parameters that move the “zero” further to the left half plane, and do not adversely affect other steady state criteria are identified. The effectiveness of these parameters to improve the dynamic performance is demonstrated.

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