A new relay feedback scheme for identification of non-minimum phase processes with time delay

2016 ◽  
Author(s):  
Prasenjit Ghorai ◽  
Saurabh Pandey ◽  
Somanath Majhi
Keyword(s):  
Time Delay ◽  
Minimum Phase ◽  
Relay Feedback ◽  
Feedback Scheme

scholarly journals Fitting of Generic Process Models by an Asymmetric Short Relay Feedback Experiment—The n-Shifting Method

2021 ◽  
Vol 11 (4) ◽  
pp. 1651
Author(s):  
José Sánchez Moreno ◽  
Sebastián Dormido Bencomo ◽  
José Manuel Díaz Martínez
Keyword(s):  
Time Delay ◽  
Transfer Function ◽  
Dynamic Systems ◽  
Transfer Functions ◽  
Process Models ◽  
Transfer Function Model ◽  
Minimum Phase ◽  
Relay Feedback ◽  
Function Model ◽  
Generic Process

This paper presents the generalization of the shifting method for relay feedback identification of dynamic systems of any order. The original shifting method enables the fitting of a maximum of five parameters of a transfer function model from the information obtained from a short relay test and without prior knowledge of the process to identify. The generalization, known as n-shifting, allows the estimation of the parameters of transfer functions of any order by applying one short relay test to the process to identify. Without loss of generality, the n-shifting approach is applied to fit an n-order plus time delay (n-OPTD) model but the approach can be also developed to identify models with other structures (non-minimum phase, unstable, integrators). Some examples of estimations are presented.

RobustH∞Control for Non-Minimum Phase Switched Cascade Systems with Time Delay

2014 ◽  
Vol 17 (5) ◽  
pp. 1590-1599 ◽  
Author(s):  
Shengzhi Zhao ◽  
Georgi M. Dimirovski ◽  
Ruicheng Ma
Keyword(s):  
Time Delay ◽  
Minimum Phase ◽  
Cascade Systems

A Design Method for Modified Smith Predictors for Non-Minimum-Phase Time-Delay Plants with Multiple Feedback-Connected Time-Delays

2010 ◽  
Vol 36 ◽  
pp. 253-262 ◽  
Author(s):  
Iwanori Murakami ◽  
Nghia Thi Mai ◽  
Kou Yamada ◽  
Takaaki Hagiwara ◽  
Yoshinori Ando ◽  
...  
Keyword(s):  
Steady State ◽  
Time Delay ◽  
Time Delays ◽  
Large Time ◽  
Design Method ◽  
Smith Predictor ◽  
Minimum Phase ◽  
Effective Time ◽  
Phase Time ◽  
Step Disturbance

In this paper, we examine a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays. The Smith predictor is proposed by Smith to overcome time-delay and known as an effective time-delay compensator for a plant with large time-delay. The Smith predictor by Smith cannot be used for plants having an integral mode, because a step disturbance will result in a steady state error. Several papers considered the problem to design modified Smith predictors for unstable plants. However, no paper examines a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays. In this paper, we examine a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays.

652 Stability condition of nonlinear time delay minimum phase system

2004 ◽  
Vol 2004 (0) ◽  
pp. _652-1_-_652-4_
Author(s):  
Tomoaki Hashimoto ◽  
Hirohisa Kojima ◽  
Hironori Fujii
Keyword(s):  
Time Delay ◽  
Stability Condition ◽  
Phase System ◽  
Minimum Phase

Dynamics and Trajectory Tracking Control of a Two-Link Robot Manipulator

2004 ◽  
Vol 10 (10) ◽  
pp. 1415-1440 ◽  
Author(s):  
Anthony Green ◽  
Jurek Z. Sasiadek
Keyword(s):  
Fuzzy Logic ◽  
Time Delay ◽  
Inverse Dynamics ◽  
Position Control ◽  
Robot Manipulator ◽  
Phase Response ◽  
Control Law ◽  
Minimum Phase ◽  
Linear Quadratic ◽  
Trajectory Tracking Control

Operational problems with robot manipulators in space relate to several factors, most importantly, structural flexibility and subsequent difficulties with their position control. In this paper we present control methods for endpoint tracking of a 12.6 × 12.6m2 trajectory by a two-link robot manipulator. Initially, a manipulator with rigid links is modeled using inverse dynamics, a linear quadratic regulator and fuzzy logic schemes actuated by a Jacobian transpose control law computed using dominant cantilever and pinned-pinned assumed mode frequencies. The inverse dynamics model is pursued further to study a manipulator with flexible links where nonlinear rigid-link dynamics are coupled with dominant assumed modes for cantilever and pinned-pinned beams. A time delay in the feedback control loop represents elastic wave travel time along the links to generate non-minimum phase response. A time delay acting on control commands ameliorates non-minimum phase response. Finally, a fuzzy logic system outputs a variable to adapt the control law in response to elastic deformation inputs. Results show greater endpoint position control accuracy using a flexible inverse dynamics robot model combined with a fuzzy logic adapted control law and time delays than could be obtained for the rigid dynamics models.

Time-Optimal Output Transition for Minimum-Phase Systems

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Jennifer Haggerty ◽  
Tarunraj Singh
Keyword(s):  
Optimal Control ◽  
Time Delay ◽  
Control Problem ◽  
Minimum Phase ◽  
Transition Control ◽  
Optimal Output ◽  
Time Optimal ◽  
Phase Systems ◽  
Poles And Zeros ◽  
Double Integrator

The time-optimal output transition control problem for stable or marginally stable systems with minimum-phase zeros is discussed in this paper. A double integrator system with a real left-half plane zero is used to illustrate the development of the time-optimal output transition controller. It is shown that an exponentially decaying postactuation control profile is necessary to maintain the output at the desired final location. It is shown that the resulting solution to the output transition time-optimal control profile can be generated by a time-delay filter whose zeros and poles cancels the poles and zeros of the system to be controlled. The design of the time-optimal output transition problem is generalized and illustrated on the benchmark floating oscillator problem.

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