A method of analysis and synthesis of closed loop servo systems containing small discontinuous non-linearities

1954 ◽  
Vol 1 (1) ◽  
pp. 19-34
Author(s):  
D. T. McRuer ◽  
R. G. Halliday
Keyword(s):  
Closed Loop ◽  
Servo Systems ◽  
Analysis And Synthesis

scholarly journals On Numerical Simulation Approach for Multiple Resonance Modes in Servo Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Qixin Zhu ◽  
Hongli Liu ◽  
Yiyi Yin ◽  
Lei Xiong ◽  
Yonghong Zhu
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Closed Loop ◽  
Resonance Mode ◽  
Servo Control ◽  
Simulation Approach ◽  
Servo Systems ◽  
Resonance Modes ◽  
Resonant Part ◽  
The Mathematical Model

Mechanical resonance is one of the most pervasive problems in servo control. Closed-loop simulations are requisite when the servo control system with high accuracy is designed. The mathematical model of resonance mode must be considered when the closed-loop simulations of servo systems are done. There will be a big difference between the simulation results and the real actualities of servo systems when the resonance mode is not considered in simulations. Firstly, the mathematical model of resonance mode is introduced in this paper. This model can be perceived as a product of a differentiation element and an oscillating element. Secondly, the second-order differentiation element is proposed to simulate the resonant part and the oscillating element is proposed to simulate the antiresonant part. Thirdly, the simulation approach for two resonance modes in servo systems is proposed. Similarly, this approach can be extended to the simulation of three or even more resonances in servo systems. Finally, two numerical simulation examples are given.

scholarly journals Output-Feedback Position Tracking Servo System with Feedback Gain Learning Mechanism via Order-Reduction Speed-Error-Stabilization Approach

Actuators ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 324
Author(s):  
Sung Hyun You ◽  
Seok-Kyoon Kim ◽  
Hyun Duck Choi
Keyword(s):  
System Parameter ◽  
Closed Loop ◽  
Order Reduction ◽  
Feedback Gain ◽  
Position Tracking ◽  
Position Measurement ◽  
Servo Systems ◽  
Learning Mechanism ◽  
Speed Error ◽  
Hardware Configuration

This paper presents a novel trajectory-tracking technique for servo systems treating only the position measurement as the output subject to practical concerns: system parameter and load uncertainties. There are two main contributions: (a) the use of observers without system parameter information for estimating the position reference derivative and speed and acceleration errors and (b) an order reduction exponential speed error stabilizer via active damping injection to enable the application of a feedback-gain-learning position-tracking action. A hardware configuration using a QUBE-servo2 and myRIO-1900 experimentally validates the closed-loop improvement under various scenarios.

Analysis and synthesis of fuzzy closed-loop control systems

1995 ◽  
Vol 25 (5) ◽  
pp. 881-888 ◽  
Author(s):  
Jian Qin Chen ◽  
Jian Hong Lu ◽  
Lai Jiu Chen
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Analysis And Synthesis

Backstepping control for gear transmission servo systems with unknown partially nonsymmetric deadzone nonlinearity

2016 ◽  
Vol 231 (14) ◽  
pp. 2580-2589 ◽  
Author(s):  
Zhiguang Shi ◽  
Zongyu Zuo ◽  
Hao Liu
Keyword(s):  
Tracking Control ◽  
Closed Loop ◽  
Gear Transmission ◽  
Closed Loop System ◽  
Unknown Parameters ◽  
Servo Systems ◽  
Output Tracking ◽  
Output Tracking Control ◽  
Break Points ◽  
Backstepping Controller

This paper deals with the output tracking control of gear transmission servo (GTS) systems in the presence of deadzone nonlinearity with nonsymmetric beak points and unknown parameters. A novel differentiable deadzone model with nonsymmetric break points is put forward, which greatly facilitates the control design for a class of mechanical systems in the presence of deadzone nonlinearity. A new smooth backstepping controller, based on the newly-developed model, is proposed for the nominal system. Then, guaranteed robust steady-state performance of the closed-loop system with parametric uncertainties is derived by using Lyapunov analysis for the perturbed nonlinear systems. Simulations are carried out to validate the proposed algorithm and analysis in this paper.

Closed Loop Step Servo Systems

1969 ◽  
Vol 15 (6) ◽  
pp. 445-453
Author(s):  
V. V. Athani ◽  
N. Rajagopal
Keyword(s):  
Closed Loop ◽  
Servo Systems

scholarly journals Delay-Dependent Stability Analysis and Synthesis for Uncertain Impulsive Switched System with Mixed Delays

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Binbin Du ◽  
Xiaojie Zhang
Keyword(s):  
Asymptotic Stability ◽  
Closed Loop ◽  
Mixed Delays ◽  
Closed Loop System ◽  
Functional Theory ◽  
Analysis And Synthesis ◽  
Impulsive Switched Systems ◽  
Delay Dependent ◽  
Impulsive Switched System ◽  
Delay Dependent Stability

This paper studies the asymptotic stability problem for a class of uncertain impulsive switched systems with discrete and distributed delays. Based on Lyapunov functional theory, delay-dependent sufficient LMI conditions are established for the asymptotic stability of the considered systems. Moreover, an appropriate feedback controller is constructed for stabilizing the corresponding closed-loop system. The results are illustrated to be efficient through an example.

scholarly journals Experimental evaluation of the parameter-based closed-loop transfer function identification for electro-hydraulic servo systems

2017 ◽  
Vol 9 (1) ◽  
pp. 168781401668442 ◽  
Author(s):  
Guang-Da Liu ◽  
Ge Li ◽  
Gang Shen
Keyword(s):  
Closed Loop ◽  
Transfer Functions ◽  
Servo System ◽  
Proportional Integral Derivative ◽  
Servo Systems ◽  
Closed Loop Systems ◽  
Loop Transfer Function ◽  
Tracking Controllers ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

Closed-loop systems of an electro-hydraulic servo system including position, acceleration, and force closed-loop systems and their closed-loop transfer functions based on parameter model are adaptive identified using a recursive extended least-squares algorithm. The position and force closed-loop tracking controllers are designed by a proportional–integral–derivative controller and are tuned by the position and force step signals. The acceleration closed-loop tracking controller is designed by a three-variable controller and the three states include position, velocity, and acceleration. Experimental results of the estimated position, acceleration, and force closed-loop transfer functions are performed on an actual electro-hydraulic servo system using xPC rapid prototyping technology, which clearly demonstrate the benefit of the adaptive identification method.

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