Modeling of a Dynamic Mirror With Antagonistic Piezoelectric Stack Actuation

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
James A. Mynderse ◽  
George T. C. Chiu
Keyword(s):  
Constitutive Models ◽  
Open Loop ◽  
Step Response ◽  
Experimental Frequency ◽  
Loop Control ◽  
Response Data ◽  
Input Control ◽  
Proposed Model ◽  
Single Input ◽  
Charging Dynamics

A dynamic mirror actuator utilizing antagonistic piezoelectric stack actuators is presented for use in laser printers. Exhibiting hysteresis and other nonlinearities in open-loop operation, the dynamic mirror actuator (DMA) requires a control structure to achieve accurate mirror positioning. A linear DMA model is developed for extending operational bandwidth under closed-loop control, employing explicit piezoelectric stack actuator (PESA) charging dynamics and incorporating two modes for single input control of opposing PESA drives. Compared to constitutive models from literature, the proposed model displays a comparable fit with experimental frequency response data while retaining a lower model order. As further validation, simulated step response data are shown to agree with experimental data.

An Analytical Tension Model for Continuum Robots with n Generally Positioned Tendons

2019 ◽  
Vol 04 (03n04) ◽  
pp. 1942003
Author(s):  
Mohsen Moradi Dalvand ◽  
Saeid Nahavandi ◽  
Robert D. Howe
Keyword(s):  
Stereo Vision ◽  
Control Algorithm ◽  
Open Loop ◽  
Open Loop Control ◽  
Continuum Robots ◽  
Loop Control ◽  
Proposed Model ◽  
Continuum Robot ◽  
Tension Loading ◽  
Tendon Compliance

The estimation of tension loads in multi-tendon continuum robots or catheters plays an important role not only in the design process but also in the control algorithm to avoid slack. An analytical tension loading model is developed that, for any given beam configuration within the workspace, calculates tendon tensions in [Formula: see text]-tendon continuum robots with general tendon positioning. The model accounts for the bending and axial compliance of the manipulator as well as tendon compliance. A 6-tendon continuum robot integrated with a stereo vision-based 3D reconstruction system is utilized to experimentally validate the proposed analytical model in open-loop control architecture. The proposed model demonstrates around 95% accuracy in estimating tendon tensions in a continuum robot with general tendon positioning and axial stretch in its tendons for all of the trials and experiments.

Efficient Linear Approach for the Closed-Loop Control of a Ionic Polymer Bending Actuator

2016 ◽  
Vol 97 ◽  
pp. 75-80 ◽  
Author(s):  
Bertrand Tondu ◽  
Aiva Simaite ◽  
Ganesh Kumar Hari Shankar Lal Das ◽  
Philippe Soueres ◽  
Christian Bergaud
Keyword(s):  
Closed Loop ◽  
Open Loop ◽  
Step Response ◽  
Order System ◽  
Initial Slope ◽  
Vertical Position ◽  
Control Voltage ◽  
Closed Loop Control ◽  
Loop Control ◽  
Bending Actuator

Tri-layer electroactive bending polymeric artificial muscles generally exhibit no overshoot during open-loop step response with a non-zero initial slope when the output is the vertical position of the bending sample tip. We propose to identify such a bending step contraction by a nonlinear system derived from a linear first order system in the form: where the parameters k, T and r depend on the u-control voltage. We show the relevance of this approach for identifying the step-response of a PEDOT:PSS/PVDF/ionic liquid actuator developed at the laboratory. As a consequence, we try to show that a linear PI-controller, including voltage constraints, is a simple and an efficient approach for a closed-loop control of the bending actuator.

Comparison of Buck–Boost and Ćuk Converters Based on Time Domain Response

2018 ◽  
Vol 27 (14) ◽  
pp. 1850222
Author(s):  
J. Leema Rose ◽  
B. Sankaragomathi
Keyword(s):  
Pid Controller ◽  
Closed Loop ◽  
State Equation ◽  
Power Converter ◽  
Open Loop ◽  
Step Response ◽  
State Equations ◽  
Loop Control ◽  
Time Domain Response ◽  
Response Method

This paper presents the design and modeling of power electronic converters such as buck–boost and Ćuk operated under continuous conduction mode (CCM). The open-loop behavior of buck–boost and Ćuk converters needs modeling and simulation using modeled equations. The closed-loop control of these converters has a propositional–integral–derivative (PID) controller. PID controller parameters are obtained from Ziegler–Nichols step response method. These converters can be analyzed using the state equation. The MATLAB/SIMULINK tool is used for simulation of those state equations. Ćuk and buck–boost converters are designed and analyzed. The mathematical model of power Converter for simulation has been carried out using SIMULINK with/without any Sim Power System Elements. The open- and closed-loop results are compared.

Research on a Composite Polynomial Model for Magnetorheological Damper

2012 ◽  
Vol 482-484 ◽  
pp. 843-847
Author(s):  
Jia Ling Yao ◽  
Wen Ku Shi ◽  
Jin Feng Lu
Keyword(s):  
Experimental Data ◽  
Nonlinear Behavior ◽  
Mr Damper ◽  
Open Loop ◽  
Polynomial Model ◽  
Magnetorheological Damper ◽  
Damping Force ◽  
Loop Control ◽  
Proposed Model ◽  
Loop Control System

The reported mathematical models of magnetorheological (MR) damper cannot make a good tradeoff among reflecting the damper’s nonlinear behavior and controllability. Damping characteristic experiments have been conducted on a MR damper. A composite polynomial model has been proposed integrating the experimental investigation and the polynomial model, in which the plot of polynomial coefficient vs. current is divided into two sections to reflect the property of the current saturation, meanwhile, the affections of exciting amplitude and frequency are considered in this model. The reverse model of the proposed model is easy to be obtained, so it is convenient to realize an open-loop control system to achieve a desirable damping force. The parameters of this model are identified using experimental data in a certain frequency and amplitude, as well as diverse currents. Compared numerical simulation with experimental data, it is verified that the proposed model can accurately predict the damping force without modifying the parameters of the model when frequency, amplitude and current changed.

Estimation of the Order and Parameters of a Fractional Order Model From a Noisy Step Response Data1

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Mahsan Tavakoli-Kakhki ◽  
Mohammad Saleh Tavazoei
Keyword(s):  
Numerical Simulation ◽  
Fractional Order ◽  
Closed Loop ◽  
Open Loop ◽  
Measurement Noise ◽  
Step Response ◽  
Order Model ◽  
Response Data ◽  
Fractional Order Model ◽  
Simulation Results

This paper deals with integral based methods to estimate the order and parameters of simple fractional order models from the extracted noisy step response data of a process. This data can be obtained from both open-loop and closed-loop tests. Numerical simulation results are presented to verify the robustness of these proposed methods in the presence of the measurement noise.

scholarly journals Stability and Dynamic Response of Analog and Digital Control loops of Bidirectional buck-boost Converter for Renewable Energy Applications

2019 ◽  
Author(s):  
Viswanatha V ◽  
Venkata Siva Reddy R ◽  
Rajeswari
Keyword(s):  
Dynamic Response ◽  
Transient Behavior ◽  
Boost Converter ◽  
Open Loop ◽  
Step Response ◽  
Loop Control ◽  
Control Loops ◽  
Energy Applications ◽  
Bode Plots ◽  
The Stability

This article presents the stability and dynamic response of open loop and closed loop control of Bidirectional buck-boost converter(BBC) using PID and PIDN controllers through transfer function model implemented in MATLAB code. In order to ensure the stability of switch mode power supplies the control loop behaviors need to be characterized. Improvement of stability of BBC using PID/PIDN compensators is demonstrated in both analog and digital domains by plotting bode plots. Step response of BBC using PID /PIDN controllers are plotted that defines the dynamic behavior of the system.PIDN compensator is proposed to maintain a healthy balance between the stability and transient behavior since both are indirectly proportional.

Position Control of Hybrid Stepper Motorbased PSD Fuzzy Controller

GIS Business ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. 867-874
Author(s):  
MusaabMohammed Ahmed ◽  
M.A. Habli
Keyword(s):  
Real Time ◽  
Position Control ◽  
Fuzzy Controller ◽  
Open Loop ◽  
Step Response ◽  
Stepper Motor ◽  
Loop Control ◽  
Soft Computing Techniques ◽  
Response Enhancement ◽  
Loop Control System

Most control systems are working on the measurement coordinates and trajectories of dynamic targets in the space need to particular type of motor to meet the accuracy. It has demanding requirements for tracking the performance of the system. The currently used different soft computing techniques for step response enhancement of hybrid stepper motor are used to build up a model using MATLAB software package. The objective of the present paper is to use    PSD fuzzy controller to enhance the performance of the open loop control system to control the speed and position of the hybrid stepper motor performance. It was represented by 2DOF with a fuzzy controller and received an excellent response and good result. The difficulties are great and real time implementation of control actuation the controlling of position of hybrid stepper motor and to improve motors efficiency. The fieldoriented for a PM stepper motor application is presented in order to demonstrate the effectiveness for this real time embedded controller, t the proposed control algorithm will realize better rise time and less overshootbetter and detailed analysis is carried out to confirm the viability of the proposed system.

scholarly journals Development of Pneumatic Servo Bearing Actuator for Nanometer Positioning

2009 ◽  
Vol 3 (3) ◽  
pp. 249-256 ◽  
Author(s):  
Masato Kadotani ◽  
◽  
Takakazu Kitagawa ◽  
Satoshi Katto ◽  
Tomoko Hirayama ◽  
...  
Keyword(s):  
Open Loop ◽  
Step Response ◽  
Open Loop Control ◽  
Aerostatic Bearing ◽  
Loop Control ◽  
Servo Valve ◽  
Parallel Observation

The ‘pneumatic servo bearing actuator (PSBA)’ that consists of an aerostatic bearing and a servo valve was proposed and developed for ultraprecise positioning. In the actuator, pressurized air controlled by the servo valve moves an actuated spool ultra-precisely. Even under open-loop control, the PSBA provided accurate replication and positioning resolution on a nanometer order. Applying simple positioning feedback and parallel observation that estimates the disturbance into the system increased the actuator stiffness to be almost infinite and promoted a sharp step response without drift and hysteresis, and thus the minimum positioning resolution of prototype PSBA was about 1 nm.

scholarly journals Stability and Dynamic Response of Analog and Digital Control loops of Bidirectional buck-boost Converter for Renewable Energy Applications

2019 ◽  
Vol 8 (2) ◽  
pp. 5181-5186
Keyword(s):  
Dynamic Response ◽  
Transient Behavior ◽  
Boost Converter ◽  
Open Loop ◽  
Step Response ◽  
Loop Control ◽  
Control Loops ◽  
Energy Applications ◽  
Bode Plots ◽  
The Stability

This article presents the stability and dynamic response of open loop and closed loop control of Bidirectional buck-boost converter(BBC) using PID and PIDN controllers through transfer function model implemented in MATLAB code. In order to ensure the stability of switch mode power supplies the control loop behaviors need to be characterized. Improvement of stability of BBC using PID/PIDN compensators is demonstrated in both analog and digital domains by plotting bode plots. Step response of BBC using PID /PIDN controllers are plotted that defines the dynamic behavior of the system.PIDN compensator is proposed to maintain a healthy balance between the stability and transient behavior since both are indirectly proportional.

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