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In this paper, the port controlled hamiltonian with dissipation (PCHD) model of unified power quality controller based on modular multilevel converter (MMC-UPQC) under dq0 frame of reference is established. Based on the model and passivity of MMC-UPQC, the passivity based controller is designed by injecting virtual damping in current inner loop, which can accelerate the convergence of error storage...
This paper reports on constructing an exhaustive full program control flow framework for precise data flow analysis of real programs. We discuss the problem of ambiguous calling relations in the presence of function pointers. A flow insensitive analysis is suggested and implemented for real C programs.
We present an interprocedural flow-sensitive analysis to identify critical load instructions in real C programs for Decoupled Virtual Shared Memory (DVSM) systems. The analysis consists of the pointer range analysis, the critical value analysis and the identifying steps. It is implemented based on the SUIF compiler and tested using programs from the SPLASH-2 suite. The results show that the method...
A directional coupler using stepped-impedance broadside coupled structure is presented. The design is targeted to have 3-dB coupling with more than 30 dB directivity across a two-octave band (more than 110% fractional bandwidth). The second-order even- and odd-mode analysis method is adopted to design the device and calculate its performance. Moreover, a prototype is modelled in a simulation tool...
A compact dual-band bandpass filter using a multi-mode resonator (MMR) is proposed. The MMR is composed of two pairs of short-ended coupled-lines, two pairs of open-ended coupled lines and four connecting transmission lines. The utilized structure enables creating five transmission zeros, resulting in controllable dual bands and wide upper-stopband suppression. By adjusting the related parameters...
A compact design of tunable crossover with a wide tuning range is presented. The proposed crossover structure is based on a two-section coupler interconnected with two varactors to achieve tuning frequency range from 0.6 GHz to 1.4 GHz. The overall size of the crossover is 0.12λg ×0.02λg (λg is the guided wavelength at working frequency), which is much more compact than previous counterparts. An excellent...
Under the condition of low signal to clutter ratio, track-before-detect algorithm (TBD) based on dynamic programming (DP) can detect ground dim SAR moving targets. However, target diffusion and strong clutter in the background may result in high false alarm rate and low detection rate in the accumulation processing of TBD, so this paper proposes the state-weighted DP-TBD. The method utilizes the characteristic...
Hypersonic aircrafts, unlike conventional aircrafts, owns special structure and unique shape. In this case, the elastic vibration of the fuselage makes its dynamical model more complicated and unstable. In this paper, the doublecantilever beam system is used to model equations of aircraft's elastic vibration. With the consideration of the impact of vibration on the attack angle, forces and momentum,...
A creative, effective and more environmental friendly polishing method, which is called constrained abrasive jet polishing was put forward and studied, based on elastic emission machining theory and abrasive fluid machining theory. This method make use of abrasive fluid that constrained by a wheel, it could repeatedly impact the surface of workpiece. As a result, compared to traditional polishing...
The linear motor platform applied in the electromagnetic launch device is a high-speed motion system, motor drive system should have the characteristic of high dynamic response. Predictive current control is an effective method to improve the dynamic response of motor drive system. In order to achieve a higher current loop bandwidth, this paper presents an improved predictive current control for PMLSM...
In order to not only reduce thrust fluctuations but also improve transient state performance of primary winding segmented PMLSM(PWS-PMLSM) applied in electromagnetic launch system, this thesis proposes the inter-stator current synchronous tracking and predictive control (ISCSTPC) algorithm based on two inverters alternating supply method for multi-stators PMLSM. The study adopts the finite element...
The designs of long-stator permanent magnet (PM) linear launcher are widely adopted modular segments to simplify system and reduce energy losses. The assembled segments structure causes non-ideal mechanical air gap condition inevitably, and it brings significant effects on electromagnetic performance. Hence, this paper investigates electromagnetic force characteristics in longstator PM linear motor...
A compact ultra-wideband in-phase power divider with planar structure is presented. The proposed device utilizes three-line parallel-coupled microstrip lines. To realize the required tight coupling for an ultra-wideband performance, a slotted ground is utilized underneath the coupled lines. Moreover, chip capacitors are connected between the central line and each of the side coupled lines. Both of...
The increasing complexity and explosive growth of smartphone applications, together with the more prevalent use of cloud computing, have inspired strong motivation for offloading computation of mobile apps to the cloud. However, there exist vulnerabilities in apps if they are offloaded in public cloud environment. In this paper, we argue that keeping sensitive information to a local device with other...
In this paper, a novel fish-bone resonator is presented by cascading multiple cross-shaped resonators. Characterized by transmission line model analysis, it is found that the resonances of the proposed fish-bone resonator can be conveniently controlled, which results in a compact size. On the other hand, in order to constructed wideband bandpass filter, a novel coupling structure is studied in connection...
An ultra-wideband (UWB) bandpass filter with a notch-band and wide upper stopband is presented in this paper. The UWB filter is realized using a ring resonator which is loaded with two sets of stubs, i.e. one is loaded in the center and two little stubs at the symmetrical side locations. The loaded stubs are used to create transmission zeros in upper stopband thus high modes are suppressed greatly...
An ultra-wideband (UWB) bandpass filter is proposed in this paper. The proposed structure composes of two pairs of microstrip short-circuited stubs which provide a microstrip-to-CPW transition, and a CPW resonator whose length is about half-guided-wavelength (λg/2) at 6.85GHz. A triple-mode UWB bandpass filter is produced using this microstrip-to-CPW transition structure. In order to suppress WLAN...
Aiming at the nonlinear time variable property of the copper electrolysis rectifier system, this paper puts forward the new controlling means to optimize copper electrolysis rectifier system by using improved fuzzy immune PID algorithm based on the investigation and analysis on the situation and tendencies of high-power electrolytic equipment home and abroad. Simulation and experimental results proves...
A compact quadruple-mode ultra-wideband (UWB) bandpass filter with sharp selectivity and extremely wide upper stopband is proposed in this paper, using a multi-stage stepped-impedance resonator, two open-circuited ends and a pair of high-low impedance stubs. The characteristics of the proposed multimode resonator are analyzed by simulation, demonstrating that the first four resonant modes can be appropriately...
The paper proposes a sensorless control strategy for long primary segmented permanent magnet linear synchronous motor(LPSPMLSM) used in electromagnetic catapult .Aiming at characteristics of parameter changes of LPSPMLSM, researchers mean to establish mathematical models of the motor. In accordance with the analysis of mathematical models of the motor, this paper presents an ameliorated sliding mode...
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