Browsing by Author "Bai, MS"

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Fault diagnosis of rotating machinery using an intelligent order tracking system
(2005-02-23)
Bai, MS
;
Huang, JM
;
Hong, MH
;
Su, FC
;
機械工程學系
This research focuses on the development of an intelligent diagnostic system for rotating machinery. The system is composed of a signal processing module and a state inference module. In the signal processing module, the recursive least square (RLS) algorithm and the Kalman filter are exploited to extract the order amplitudes of vibration signals, followed by fault classification using the fuzzy state inference module. The RLS algorithm and Kalman filter provide advantages in order tracking over conventional Fourier-based techniques in that they are insensitive to smearing problems arising from closely spaced orders or crossing orders. On the basis of thus obtained order features, the potential fault types are then deduced with the aid of a state inference engine. Human diagnostic rules are fuzzified for various common faults, including the single fault and double fault situations. This system is implemented on the platform of a floating point digital signal processor, where a photo switch and an accelerometer supply the shaft speed and acceleration signals, respectively. Experiments were carried out for a rotor kit and a practical four-cylinder engine to show the effectiveness of the proposed system in tracking the rotating order with precise inference. (C) 2003 Elsevier Ltd. All rights reserved.
Implementation of an active headset by using the H-infinity robust control theory
(1997-10-01)
Bai, MS
;
Lee, D
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
This paper presents a methodology for implementing an active headset by using H-infinity robust control theory. The adopted structure is feedback tracking control. Performance, stability, and robustness of the closed-loop system have been taken into account in the design procedure by using a general framework of the H-infinity theory. The resultant controller is realized on the basis of operational amplifier circuitry. Experiments are conducted to test the developed headset. The result shows that the headset achieves broadband attenuation up to approximately 15 dB in the band 200-800 Hz. The design considerations indicated in the experimental result are also addressed. (C) 1997 Acoustical Society of America. [S0001-4966(97)05709-3] PACS numbers: 43.50.Ki, 43.38.Si [GAD].
Implementation of an active headset by using the H-infinity robust control theory
(1997-10-01)
Bai, MS
;
Lee, D
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents a methodology for implementing an active headset by using H-infinity robust control theory. The adopted structure is feedback tracking control. Performance, stability, and robustness of the closed-loop system have been taken into account in the design procedure by using a general framework of the H-infinity theory. The resultant controller is realized on the basis of operational amplifier circuitry. Experiments are conducted to test the developed headset. The result shows that the headset achieves broadband attenuation up to approximately 15 dB in the band 200-800 Hz. The design considerations indicated in the experimental result are also addressed. (C) 1997 Acoustical Society of America. [S0001-4966(97)05709-3] PACS numbers: 43.50.Ki, 43.38.Si [GAD].