ORCID Profile
0000-0001-6110-8099
Current Organisation
The Hong Kong Polytechnic University
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Publisher: Elsevier BV
Date: 11-2021
Publisher: IOP Publishing
Date: 15-06-2009
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 05-2004
DOI: 10.2514/1.975
Publisher: Springer Science and Business Media LLC
Date: 24-03-2011
Publisher: Elsevier BV
Date: 07-2023
Publisher: SPIE
Date: 09-03-2014
DOI: 10.1117/12.2044031
Publisher: SAGE Publications
Date: 30-07-2008
Abstract: An inverse analysis based on the artificial neural network technique is introduced for effective identification of crack damage in aluminum plates. The concepts of digital damage fingerprints and damage parameter database, which are prerequisites for neural network developing and training, are presented. Parameterized modeling for finite element analysis and an information mapping approach are applied to constitute the damage parameter database cost-effectively. The generalization performance of the neural network is examined by a process of `leave-one-out' cross-validation and erse factors are discussed, based on which the optimization of the neural network architecture is evaluated. The capability of this inverse approach is assessed by two crack cases from experiments, with good accuracy obtained in damage parameters (central position, size, and orientation).
Publisher: Acoustical Society of America (ASA)
Date: 31-01-2005
DOI: 10.1121/1.1848072
Abstract: Sound radiated by a computer cooling fan consists of tones which are phase locked with the rotation, and other less deterministic tones and broadband random noise. This paper demonstrates the feasibility of globally eliminating the rotation-locked tones by applying a very simple destructive interference to a modified cooling fan with the number of struts equal to the number of rotor blades. The rig consists of a miniature electret microphone used as a rotation sensor, an ordinary loudspeaker, and a bandpass filter with adjustable litude and phase delay. The microphone is located at the inlet bellmouth of the fan to pick up the fluctuating aerodynamic pressure caused by the passing rotor blades. The pressure spectrum is rich in the blade passing frequency (BPF) and its low-order harmonics. It provides much better performance than a pulse-generating tachometer. Analysis of the original fan noise shows that about 90% of the radiated tonal sound is phase locked with rotation, and this portion is almost completely eliminated in all directions. The reductions of the radiated sound power in the first two BPFs are 18.5 and 13.0 dB, respectively, and the overall sound power reduction is 11.0 dB.
Location: Canada
No related grants have been discovered for Li CHENG.