Model-free condition monitoring with confidence

2019 ◽  
Vol 32 (4-5) ◽  
pp. 466-481 ◽  
Author(s):  
M. Götzinger ◽  
N. TaheriNejad ◽  
H. A. Kholerdi ◽  
A. Jantsch ◽  
E. Willegger ◽  
...  
Keyword(s):  
Condition Monitoring ◽  
Free Condition ◽  
Model Free

A General Approach for Current-Based Condition Monitoring of Induction Motors

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
W. J. Bradley ◽  
M. K. Ebrahimi ◽  
M. Ehsani
Keyword(s):  
Fuzzy Logic ◽  
Fault Detection ◽  
Induction Motor ◽  
Condition Monitoring ◽  
Industrial Condition ◽  
Detection Methods ◽  
Model Free ◽  
Motor Current Signature Analysis ◽  
Diagnosis Algorithm ◽  
Rotor Cage

The development and validation of a novel current-based induction motor (IM) condition monitoring (CM) system is described. The system utilizes only current and voltage signals and conducts fault detection using a combination of model-based and model-free (motor current signature analysis) fault detection methods. The residuals (or fault indicator values) generated by these methods are analyzed by a fuzzy logic diagnosis algorithm that provides a diagnosis with regard to the health of the induction motor. Specifically, this includes an indication of the health of the major induction motor subsystems, namely the stator windings, the rotor cage, the rolling element bearings, and the air-gap (eccentricity). The paper presents the overall system concept, the induction motor models, development of parameter estimation techniques, fault detection methods, and the fuzzy logic diagnosis algorithm and includes results from 110 different test cases involving four 7.5 kW four pole squirrel cage motors. The results show good performance for the four chosen faults and demonstrate the potential of the system to be used as an industrial condition monitoring tool.

Ultrasonic Wireless Power Links for Battery-Free Condition Monitoring in Metallic Enclosures

Ultrasonics ◽  
2021 ◽  
pp. 106395
Author(s):  
Hailing Fu ◽  
Jing Rao ◽  
Mohammad S. Harb ◽  
Stephanos Theodossiades
Keyword(s):  
Condition Monitoring ◽  
Wireless Power ◽  
Free Condition

Representation, abstraction, and simple-minded sophisticates

2020 ◽  
Vol 43 ◽  
Author(s):  
Peter Dayan
Keyword(s):  
Decision Theory ◽  
Predictive Coding ◽  
Bayesian Decision Theory ◽  
Bayesian Decision ◽  
Model Based ◽  
Model Free

Abstract Bayesian decision theory provides a simple formal elucidation of some of the ways that representation and representational abstraction are involved with, and exploit, both prediction and its rather distant cousin, predictive coding. Both model-free and model-based methods are involved.

“What Freedom?”

2019 ◽  
Vol 74 (3) ◽  
pp. 305-331
Author(s):  
John Owen Havard
Keyword(s):  
South America ◽  
French Revolution ◽  
The Political ◽  
The Novel ◽  
Free Condition ◽  
Narrative Design ◽  
Economic Liberalism ◽  
History Of ◽  
Ways Of Thinking ◽  
John Owen

John Owen Havard, “‘What Freedom?’: Frankenstein, Anti-Occidentalism, and English Liberty” (pp. 305–331) “If he were vanquished,” Victor Frankenstein states of his monstrous creation in Mary Shelley’s Frankenstein (1818), “I should be a free man.” But he goes on: “Alas! what freedom? such as the peasant enjoys when his family have been massacred before his eyes, his cottage burnt, his lands laid waste, and he is turned adrift, homeless, pennyless, and alone, but free.” Victor’s circumstances approximate the deracinated subject of an emergent economic liberalism, while looking to other destitute and shipwrecked heroes. Yet the ironic “freedom” described here carries an added charge, which Victor underscores when he concludes this account of his ravaged condition: “Such would be my liberty.” This essay revisits the geographic plotting of Frankenstein: the digression to the East in the nested “harem” episode, the voyage to England, the neglected episode of Victor’s imprisonment in Ireland, and the creature’s desire to live in South America. Locating Victor’s concluding appeal to his “free” condition within the novel’s expansive geography amplifies the political stakes of his downfall, calling attention to not only his own suffering but the wider trail of destruction left in his wake. Where existing critical accounts have emphasized the French Revolution and its violent aftermath, this obscures the novel’s pointed critique of a deep and tangled history of English liberty and its destructive legacies. Reexamining the novel’s geography in tandem with its use of form similarly allows us to rethink the overarching narrative design of Frankenstein, in ways that disrupt, if not more radically dislocate, existing rigid ways of thinking about the novel.

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