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In this paper, three different models of friction in presliding regime on linear motor platform are deduced according to basic physical laws, which are named as the Kelvin model, the modified Kelvin model and the four-element model. To validate the effectiveness of these models, the particle swarm optimization is applied to determine the coefficients in each model. Then experiments of ramp input force...
A quasi single-stage power factor correction converter, which is composed of a three-level (TL) Boost converter and a DC-DC transformer (DCX), is presented and analyzed in this paper. The DC output load is connected to one of the dividing capacitors of the TL Boost converter, so that the load voltage can be lower than the peak amplitude of the AC line voltage and part of the AC input power can be...
In this study, the authors propose a non-orthogonal multiple access (NOMA) relaying protocol with truncated automatic repeat request (ARQ), where the source simultaneously transmits two signals to the relay and the destination using superposition coding technique in the power domain. The successive interference cancelation technique is adopted by the relay, who should first decode its own data and...
To improve the design and test of main circuit of aerospace power inverter, a dynamic testing technique is proposed in this paper. Through high speed signal acquisition and isolation, monitoring and evaluating the voltages and currents changing process of main circuit, the design parameters can be optimized based on the testing results which can improve the reliability and electromagnetic compatibility...
The More Electric Aircraft (MEA) emphasizes the utilization of electrical power to replace hydraulic power. And the electromechanical actuation is one of the key technologies for MEA. There are a lot of advantages when electromechanical actuators are used in civil aircraft, such as increasing the efficiency and reducing the take-off weight of aircraft. Furthermore, it also can shorten the production...
A low-price dual-fault tolerant control method of feedback loop for permanent magnet synchronous motor is proposed without extra hardware and sensors in an electromechanical actuator. In this method, position feedback of electromechanical actuator is used to accomplish the vector control of motor and speed control of actuator if the rotor position sensor falls in fault. And rotor position sensor of...
The spectrum sharing is able to meet the increasing data transmission requirements over the limited spectrum bands, while the energy harvesting is a promising technique to make the network sustainable by self-recharging the terminals. For the cognitive radio network with one primary link and one secondary link, we propose a time-domain spectrum sharing scheme based on the wireless energy transfer...
With the continuous development of computer technology, enterprise information systems, and compared to the past, there has also been significant progress. Enterprise applications are no longer satisfied with a single system and a simple client/server system, but rather toward the three-tier and multi-tier architecture distributed environment. Distributed application based on middleware technologies,...
The fingerprint has uniqueness and the invariability, does not have two identical fingerprints, therefore by widespread application in biological recognition technology. With the rapid development of the computer technology, the wide application in image processing and the innovation in optical scanning instruments make them become instruments for getting fingerprint image, thus fingerprint identification...
Carbon Nanotube Field Effect Transistor (CNFET) is used for high performance, high stability and low power SRAM design as an alternative material to silicon in recent years. However, tube misalignment problem obstructs the application of CNFET to large scale integration. In this paper, we propose a design method for 6T CNFET misalignment immune SRAM circuit. By vulnerability analysis of a basic layout,...
This paper presents a novel split ring resonator (SRR) UWB antenna. A novel hybrid design of microstrip-fed parasitic coupled monopole antenna is presented. The proposed antenna structure consists of a directly fed SRR and electromagnetically coupled parasitic patch, with a pair ‘V’ shape notch in the rectangular ground plane, so the ground plane divided into two part: one parasitic patch and a small...
A novel low power 6-T SRAM cell operating in sub-threshold region based on CNFET is presented. Compared with the 4-T SRAM structure, the proposed 6-T SRAM structure can operate with 0.4V supply voltage, which is not possible for the 4-T structure. The proposed 6-T SRAM structure is optimized with the back-gate biasing technique for speed and stability improvements. Compared with a conventional 6-T...
As scaling down silicon semiconductor device feature size encounters great challenge nowadays, Carbon Nanotube Field Effect Transistor (CNFET) has been introduced for high stability, high performance and low power SRAM cell design as an alternative material. Static Noise Margin (SNM) is an important expression of SRAM stability. Three factors, namely supply voltage, threshold voltage and transistor...
Subthreshold leakage, dynamic power consumption and delay are major issues for circuits design, especially for SRAM design. Subthreshold leakage and dynamic power consumption can be decreased while supply voltage is scaled down. However, this may dramatically increase the circuit delay. In this paper, we proposed a novel 6t SRAM design which operates in near threshold region to optimize leakage power...
This article presented a Gunn oscillator with plane substrate circle cavity. A 2-port model is present to determine both the oscillating frequency and output circuit. This oscillator is working in its third oscillating mode which provides a output power about 15.0dBm and the phase noise about -85dB at offset 100KHz.
Fuzzy sliding mode controller based on trending law for electric actuator is proposed in this paper. The sliding mode is used to enhance the robustness of the system, the trending law is used to improve the system dynamic characteristics of reaching the sliding surface, and the fuzzy tuning schemes are employed to reduce the chattering problem around the sliding surface. The integral sliding mode...
This paper presented a miniaturization rectangular waveguide which much smaller than hallow rectangular waveguide (HRWG) having same cutoff frequency of dominant mode and a large bandwidth of single dominant mode working (BWSMW) by inserting a suspended dielectric layer which partly covered a metal grounded plane. The numerical simulating shows that the cutoff frequency of dominant mode descended,...
This paper presents a simple methodology for deducing the resistors of attenuators based on the relationship of S parameters and ABCD metric. Single attenuators composed of embedded thin film resistors simulate up to 20 GHz. For 30 dB attenuators is difficult to implement for wide bandwidth, cascade attenuators can solve the problem.
Slide mode variable structure control method is used for designing a digital controller of BLDC electric actuator in this paper. Firstly, the mathematic model of electric actuator is built according to the selected BLDC motor. Secondly, two slide mode algorithms, proportion switching algorithm and velocity trending law algorithm, are designed for the electric actuation system. Thirdly, we design a...
Based on the half mode substrate integrated waveguide (HMSIW) technology, a new type of Gunn diode oscillator was developed. Main emphasis was placed on HMSIW resonant cavity structure. Restrictions on the performance of the oscillators imposed by packaged networks and the self-characteristic of the Gunn diode transistor devices have been analyzed. This oscillator's performance is characterized by...
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