scholarly journals Consistency of open-loop experimental frequency-response data with coprime factor plant models

1998 ◽  
Vol 43 (12) ◽  
pp. 1680-1691 ◽  
Author(s):  
B. Boulet ◽  
B.A. Francis
Keyword(s):  
Frequency Response ◽  
Open Loop ◽  
Experimental Frequency ◽  
Response Data

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.

Frequency response analysis methods for open-loop servo drives and control systems

2020 ◽  
pp. 108-114
Author(s):  
Oleg B. Belonogov
Keyword(s):  
Frequency Response ◽  
Control Systems ◽  
Open Loop ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Servo Drive ◽  
Response Data ◽  
Analysis Methods ◽  
Servo Drives ◽  
And Control

The paper presents results of development of frequency response analysis methods for open-loop servo drives and control systems, which use frequency response data of closed-loop servo drives and control systems obtained using Fourier and Laplace transforms of transient response calculated using their linear or linearized math models. The methods that have been developed can be used for approximate calculation of frequency response of servo drives and control systems based on their math models with slight non-linearities. Equations are derived for calculating frequency response of open-loop servo drives and control systems for several particular cases of feedback loop transfer function. The paper studies the efficiency of the developed frequency response analysis methods for open-loop servo drives and control systems. The obtained frequency response data for open-loop servo drives and control systems can be used for evaluating the amplitude and phase stability margins for these entities. Key words: frequency response; open-loop servo drive; control systems.

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