A class of observer-based fault diagnosis schemes under closed-loop control: performance evaluation and improvement

Unlike input deadband, the sandwiched deadband between actuator and plant dynamics is very difficult to be explicitly compensated for due to the proceeding actuator dynamics whose effect may not be negligible. The paper presents a practical way to overcome the design conservativeness of existing methods in dealing with sandwiched deadband. Specifically, a describing function based nonlinear analysis method is proposed to characterize the effect of the sandwiched deadband on the stability and performance of the overall closed-loop system. The analysis results can be used to determine the highest closed-loop bandwidth that can be achieved without inducing residual limit cycles and instability. Optimal controller parameters can then be found to maximize the achievable closed-loop control performance. The technique is applied to an electrohydraulic system controlled by closed-center valves and a nonlinear feedback controller. Simulation results showed severe oscillations as the feedback control gains are increased to the predicted threshold values. Comparative experimental results also showed the effectiveness of the proposed method in reducing the conservativeness of traditional design and the improved closed-loop control performance in implementation.

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A probabilistic framework for reference design for guaranteed fault diagnosis under closed-loop control

2017 IEEE 56th Annual Conference on Decision and Control (CDC) ◽

10.1109/cdc.2017.8264526 ◽

2017 ◽

Author(s):

G. Roberto Marseglia ◽

Davide M. Raimondo ◽

Lalo Magni ◽

Ali Mesbah

Keyword(s):

Fault Diagnosis ◽

Closed Loop ◽

Closed Loop Control ◽

Probabilistic Framework ◽

Loop Control ◽

Reference Design

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727 Performance evaluation of closed-loop control and open-loop control for cantilevered electromagnetic actuators

The Proceedings of the Dynamics & Design Conference ◽

10.1299/jsmedmc.2010._727-1_ ◽

2010 ◽

Vol 2010 (0) ◽

pp. _727-1_-_727-6_

Author(s):

Tatsuya Suzuki ◽

Kenichiro Nonaka

Keyword(s):

Performance Evaluation ◽

Closed Loop ◽

Open Loop ◽

Closed Loop Control ◽

Open Loop Control ◽

Electromagnetic Actuators ◽

Loop Control

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Closed-Loop Control Performance of the Hypoglycemia-Hyperglycemia Minimizer (HHM) System in a Feasibility Study

Journal of Diabetes Science and Technology ◽

10.1177/1932296813511730 ◽

2014 ◽

Vol 8 (1) ◽

pp. 35-42 ◽

Cited By ~ 10

Author(s):

Daniel A. Finan ◽

Thomas W. McCann ◽

Linda Mackowiak ◽

Eyal Dassau ◽

Stephen D. Patek ◽

...

Keyword(s):

Feasibility Study ◽

Closed Loop ◽

Closed Loop Control ◽

Control Performance ◽

Loop Control

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Variable Step-Length Efficiency Optimum Control of Traveling Wave Ultrasonic Motor System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.6484 ◽

2011 ◽

Vol 383-390 ◽

pp. 6484-6489

Author(s):

Bo Liu ◽

Jing Zhuo Shi ◽

Xun Liu

Keyword(s):

Motor System ◽

Closed Loop ◽

Step Length ◽

Operational Efficiency ◽

Ultrasonic Motor ◽

Closed Loop Control ◽

Driving Voltage ◽

Control Performance ◽

Optimum Control ◽

Loop Control

To achieve the operational efficiency maximization of ultrasonic motor system, this paper analyzes optimum control of the ultrasonic motor system’s efficiency including driving circuit, while the speed closed-loop control performance is ensured. Based on regulating characteristics of open-loop speed control and fuzzy control, two optimum control methods for regulating the changing step-length of driving voltage amplitude, to shorten the elapsed time of efficiency optimization process and to improve the general operational efficiency of motor system and the speed closed-loop control performance, are also analyzed. The effectiveness of the methods mentioned in this paper are reflected using experiments.

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