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排序方式: 共有427条查询结果,搜索用时 15 毫秒
1.
2.
A neuro-fuzzy approach to automatic diagnosis and location of stator inter-turn faults in CSI-fed PM brushless DC motors 总被引:2,自引:0,他引:2
Awadallah M.A. Morcos M.M. Gopalakrishnan S. Nehl T.W. 《Energy Conversion, IEEE Transaction on》2005,20(2):253-259
The paper presents a neuro-fuzzy-based perspective to the automation of diagnosis and location of stator-winding interturn short circuits in CSI-fed brushless dc motors. Performance of the drive under normal and short-circuit conditions are obtained through classical lumped-parameter network models. Waveforms of the electromagnetic torque and summation of phase voltages are monitored to develop two independent diagnostic algorithms. Diagnostic indices derived from the characteristic waveforms using discrete Fourier transform (DFT) lead to identifying the number of shorted turns. Fault location is achieved through a different set of indices extracted by the short-time Fourier transform (STFT). Adaptive neuro-fuzzy inference systems (ANFIS) are trained based on simulation results to automate the diagnostic process. ANFIS testing along with the good agreement between simulated and measured waveforms show the effectiveness of the proposed techniques. 相似文献
3.
B. V. R. Chowdari R. Gopalakrishnan S. H. Goh K. L. Tan 《Journal of Materials Science》1988,23(4):1248-1254
Ionic conductivity of the Ag2O-MoO3-V205 system has been studied over a wide range of frequency, temperature and composition. A narrower glass forming region has been found in comparison to the corresponding Ag2O-MoO3-P2O5 and Ag2O-B2O3-P2O5 systems. The highest conductivity at room temperature, rt, = 3.21 × 10–6–1 cm–1 (d.c.) with an activation energy,E
act, of 0.466 eV, was observed for the glass former's ratio of unity. Further, it reached a maximum value of 2.2 × 10–2¨-1 cm–1 withE
act = 0.153 eV when the oxide-base glass was dissolved with Agl. D.c. conductivity, hopping rate and relaxation time in the present system have been found to be characterized by the same activation energy. 相似文献
4.
5.
Narayanan Gopalakrishnan Padmanabha Pillai V Shanti Cadavallur Subrahmanian Narayanan 《Journal of the science of food and agriculture》1990,50(1):111-117
Analysis of clove (Syzygium aromaticum L) bud oil extracted with liquid and supercritical carbon dioxide shows significant qualitative and quantitative compositional differences compared with oil obtained by the conventional hydrodistillation process. The parameters of pressure, temperature, contact time etc, and also the clove oil components, affect the extraction of the bud flavour from the spice. 相似文献
6.
An Efficient Lossless Telemetry Data Compression and Fault Analysis System Using 2SMLZ and CMOW-DLNN
Ramalingam Parameshwaran Thanuja R. Bhavani R. Gopalakrishnan Lakshminarayanan 《Wireless Personal Communications》2022,122(3):2325-2334
Wireless Personal Communications - In this paper, the effect of perfect electric conductor (PEC) as a ground plane on antenna array is investigated. Vertical electric dipole which is of... 相似文献
7.
Amr Alasaad Sathish Gopalakrishnan Victor C.M. Leung 《Wireless Communications and Mobile Computing》2013,13(5):483-499
Wireless mesh networks (WMNs) have emerged as a promising technology that provides low‐cost broadband access to the Internet for fixed and mobile wireless end users. An orthogonal evolution in computer networking has been the rise of peer‐to‐peer (P2P) applications such as P2P data sharing. It is of interest to enable effective P2P data sharing in this type of networks. Conventional P2P data sharing systems are not cognizant of the underlying network topology and therefore suffer from inefficiency. We argue for dual‐layer mesh network architecture with support from wireless mesh routers for P2P applications. The main contribution of this paper is P2PMesh: a topology‐aware system that provides combined architecture and efficient schemes for enabling efficient P2P data sharing in WMNs. The P2PMesh architecture utilizes three schemes: (i) an efficient content lookup that mitigates traffic load imbalance at mesh routers; (ii) an efficient establishment of download paths; and (iii) a data transfer protocol for multi‐hop wireless networks with limited capacity. We note here that the path establishment and data transfer schemes are specific to P2P traffic and that other traffic would use routes determined by the default routing protocol in the WMN. Simulation results suggest that P2PMesh has the potential to improve the performance of P2P applications in a wireless multi‐hop setting; specifically, we focused on data sharing, but other P2P applications can also be supported by this approach. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
8.
Bahl L.R. de Souza P.V. Gopalakrishnan P.S. Kanevsky D.S. Nahamoo D. 《Signal Processing, IEEE Transactions on》1992,40(11):2814-2816
A method for identifying a set of candidate words that matches well with a given utterance is discussed. The method uses precomputed groups of acoustically similar words. Given a vocabulary, for each word a short list of words that are acoustically similar to it is computed. These groups are constructed using training utterances recorded by several speakers and used in an isolated utterance recognition system to construct candidate word lists during recognition. Experiments show that the correct word appears on the short list of candidate words constructed during recognition using this scheme over 98% of the time 相似文献
9.
Fast and small squarers are needed in many applications such as image compression. A new family of high-performance parallel squarers based on the divide-and-conquer method is reported. Our main result was realized for the basis cases of the divide-and-conquer recursion by using optimized n-bit primitive squarers, where n is in the range of two to six. This method reduced the gate count and provided shorter critical paths. A chip implementing an 8-b squarer was designed, fabricated, and successfully tested, resulting in 24 million operations per second (MOPS) using a 2-μm CMOS fabrication technology. This squarer had two additional features: increased number of squaring operations per unit circuit area and the potential for reduced power consumption per squaring operation 相似文献
10.
Ram Kumar K. Gopalakrishnan Irshad Ahmad C. N. R. Rao 《Advanced functional materials》2015,25(37):5910-5917
Composites of boron nitride (BN) and carboxylated graphene are prepared for the first time using covalent cross‐linking employing the carbodiimide reaction. The BN1–xGx (x ≈ 0.25, 0.5, and 0.75) obtained are characterized using a variety of spectroscopic techniques and thermogravimetric analysis. The composites show composition‐dependent electrical resistivity, the resistivity decreasing with increase in graphene content. The composites exhibit microporosity and the x ≈ 0.75 composite especially exhibits satisfactory performance with high stability as an electrode in supercapacitors. The x ≈ 0.75 composite is also found to be a good electrocatalyst for the oxygen reduction reaction in fuel cells. 相似文献