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Finite element analysis was performed on the representative volume element of piezoelectric elements with interdigitated electrodes (IDEs). The variations of piezoelectric material properties during poling were considered in the analysis. The numerical results of models with different piezoelectric polarization states were compared with the result given by the so called uniform field model. Though...
The process of heated winding process for composite in which winding and curing occur at the same time and influence mutually is complicated. The fields of inside the composite have effect on each other while the layers wound are influenced by curing reaction. In this paper, the two dimensional model is built layer by layer in ANSYS and the model is activated using elements “birth and death” method...
A four-axis winding machine control system based on embedded motion controller is designed in this paper. The mathematical model of the axisymmetric body is established, the law of geodesic winding is analysed by the theory of differential geometry, the motion trail of eye and the corner of mandrel is attained by specific constraint condition and the control way of electronic cam is adopted to solve...
The performance of active long-period waveguide grating based on Er-Yb codoped phosphate glass is studied by using coupled-mode theory. The transmission spectra of the gratings show distinct band-rejection at specific wavelengths, known as the resonance wavelengths. The phase-matching curves of the gratings, which govern the relationship between the resonance wavelength and the grating pitch, is investigated...
TD-SCDMA mobile network planning involves complex computing and several abstract conceptions. To meet the need of the domestic network construction and fill the gap in simulation teaching in universities for professional communications, the TD-SCDMA wireless network planning simulation teaching system software is designed and developed. The system is designed with C# language and developed with ArcEngine...
Wireless power transfer via magnetically coupled resonators is a new technology which energy can be transferred in the non-radiative near-field. Resonant frequency is critical and resonant frequency drift is the application barrier in wireless power transfer. This paper analyzes the effects about resonant frequency drifting mechanism. Thus, it reveals that the value of inductance and capacitance of...
Single-mode fiber FP cavity ring-down beat spectroscopy was proposed and experimentally demonstrated. A general relationship between beat frequency and birefringence degree in single-mode fiber was given. Its applications in photonic generation of microwave and millimeter waves and pressure sensor are also presented.
The shuffle operation is one of the bottlenecks invector DSPs. The partitioning problem of the shuffle matrix will have a great effect on the design of the shuffle unit, when dealing with the small grain data shuffle using a smaller-sized crossbar. The traditional matrix block partitioning solution will bring much chip area, power consumption and critical path delay. This paper presents a new matrix...
This paper presents a Vector DMA Cache (VDC)scheme between the DMA bus and the Vector Memory (VM) in vector DSPs. The VDC can effectively reduce the VM access counts from the DMA requests and decrease the VM access conflicts. The VDC is specially designed for the DMA and not for the CPU, so it has some unique techniques which differ from the traditional CPU cache scheme. The main techniques of the...
The fundamental principle of a novel wireless power transfer(WPT) technology is investigated in this paper through coupled mode theory. The concept of strong coupling is proposed considering coupling effect between eletromagnetic(EM) waves. It is simulated by equivalent circuit method and validated by experiment.
Wireless power transfer based on witricity technology is a new technology which energy can be transferred via coupled magnetic resonances in the non-radiative near-field. In order to verify its feasibility, coupled mode theory and power transfer system structure was proposed in this paper. Based on these analysis, The wireless power transfer experimental device is designed. Experimental results shows...
A novel approach controlling the microwave and millimeter wave signal series generated by using a single mode fiber FP cavity with pulse laser injection is proposed and experimentally demonstrated. A general relationship between the maximum signal number generated and birefringence degree of a single mode fiber is derived.The results demonstrate the new concept controlling the signal series of optical...
The performances of multilayer medium thin film (MMTF) and long-period waveguide grating (LPWG) filters are compared and contrasted for the case of optical waveguide amplifiers. The effects of the transmission spectra of the two kinds of filters on the amplified spontaneous emission spectrum of Er-Yb codoped phosphate glass waveguide amplifiers are discussed. The analysis demonstrates that LPWG filters...
Biological characteristic recognition is a kind of identification technology that used the human's special physiology or behavior characteristic. It provided a kind of high reliability, good stability approach to identity appreciation. Face recognition is very popular branch of the biological characteristic recognition. And also is a very active subject in the fields of the computer vision and the...
In this paper, the principle of wireless power transmission technology based on resonant coupling is discussed. A simplified equivalent circuit modeling for wireless power transmission system is established. A resonator constituted by single-layer helical coils is designed and investigated. Based on experiments, the output load voltage correlated with different distance, driving frequency and disalignment...
It often produces a stronger cohesive force between high resistivity dust and polar plate in ESP, but cleaning and papping always have not been resolved. In order to reduce cohesive force between high resistivity dust and polar plate, the influence of coating on force conditions of dust is analyzed in this paper, through theoretical analysising and calculating the appropriate coating materials are...
A hybrid optical filter based on long-period waveguide grating and multilayer medium thin film is proposed. The effects of the transmission spectra of the filter on the amplified spontaneous emission spectrum of Er-Yb codoped phosphate glass waveguide amplifiers are discussed. It's demonstrated that the flatness of below 0.5dB is achieved over a bandwidth of ~ 30 nm.
In this paper, a resonant coupling wireless power transmission system whose resonator using single-layer helical coils is designed. Based on analysis of equivalent circuit, the efficiency and optimal transmission distance are obtained, and its correctness is verified by experiment. The resonant frequency and electromagnetic field distribution of system are obtained through high frequency finite element...
During the 21st century, China's B2C e-commerce develops rapidly. All companies should make every effort to create their own e-commerce site. But it is time consuming to establish an e-commerce site from a needs analysis, site architecture design, web design production, coding, customer monitoring, and system test that require at least two months time. Such a long time for the enterprises, the efficiency...
Contactless electrical energy transmission system (CEET) which can work under atrocious conditions realizes contactless transmission between power and loads. It is necessary to improve the efficiency of the detachable transformer, as it plays an important role in the system. Based on the structure and work principle of the system, related parameters are analyzed in this paper. Detachable transformer...
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