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João Miguel Silva, Marco António Oliveira, André Ferraz Saraiva and Aníbal J. S. Ferreira
The estimation of the frequency of sinusoids has been the object of intense research for more than 40 years. Its importance in classical fields such as telecommunications, instrumentation, and medicine has been extended to numerous specific signal proces...
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Jinrong Bao, Chenzhen Ji, Deng Pan, Chao Zong, Ziyang Zhang and Tong Zhu
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion. This rela...
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Naveed Ashraf, Ghulam Abbas, Nasim Ullah, Ahmad Aziz Al-Ahmadi, Ali Raza, Umar Farooq and Mohsin Jamil
Single-phase direct frequency converters are gaining attraction at the research and academic level as they are rapidly getting space over conventional multistage converters. The converters developed with a rectification and inversion process using a DC-l...
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Andrea Cristofolini, Arturo Popoli, Leonardo Sandrolini, Giacomo Pierotti and Mattia Simonazzi
A numerical methodology is proposed for the calculation of transient electromagnetic interference induced by overhead high-voltage power lines in metallic structures buried in soil?pipelines for oil or gas transportation. A series of 2D finite element si...
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Zhiyong Zhang, Thomas Sattel, Yujie Zhu, Xuan Li, Yawei Dong and Xiaoting Rui
Varying compliance (VC) is an unavoidable form of parametric excitation in rolling bearings and can affect the stability and safety of the bearing and its supporting rotor system. To date, we have investigated VC primary resonance in ball bearings, and i...
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Mohammed Kassim Ahmed,Samah Fakhri Aziz,Naors Y. Anad Alsaleem,Konstantyn Sielivanov,Mykola Moskalets
Pág. 34 - 44
A methodology has been proposed for estimating the nonlinear effects in radio tracts of receiving and transmitting devices in radio-electronic means of mobile communication systems, based on using the nonlinear transfer functions of the higher-order Volt...
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Zhuming Cheng, Jie Zeng, Dakai Liang, Chen Chang and Bing Wang
Improving the phase sensitivity of the optical fiber Sagnac sensor is very important for accurately detecting weak signals of acoustic emission. Theoretical analysis shows that the initial phase of the sensor is p under ideal conditions, and the maximum ...
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Jiesi Luo and Shaohui Zhang
The periodic impulse characteristics caused by rolling bearing damage are weak in the incipient failure stage. Thus, these characteristics are always drowned out by background noise and other harmonic interference. A novel approach based on multi-resolut...
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Jae-Hyun Han and Young-Cheol Lim
In this study, to achieve the constant current drive and brightness control without a separate pulse width modulation (PWM) converter, a single converter is designed and verified by experiment under the condition of a multiple LED light load with differ...
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T. M. Serdiuk,V. I. Gavryliuk
Pág. 15 - 18
The occurrence reasons of 50 Hz frequency interference in rail circuits are analysed. The interference was registered on some railway sections by an experimental research. The average value of amplitude has made 1.8 ? in a dividing pause of a code «Green...
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