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On the reflectarray using ring-type resonator elements, a high efficiency design method was adopted and its results were confirmed at the design frequency. In this paper, in addition to the conventional high efficiency design method, a reflectarray was designed and measured by considering the broadband conditions. As a result, the aperture efficiency of the fabricated reflectarray was more than 65%...
This paper describes a design method of a metasurface that consists of two types FSS (Frequency Selective Surface) and the ground plane to realize broadband reflected wave reduction. The ideal filtering characteristics of one FSS is clarified when the other FSS is a patch type FSS. A loop and patch type FSS is proposed to realize the ideal filtering characteristics. Then, a meta-surface with reflected...
Aberration theory has been proposed to estimate the frequency characteristics of a reflectarray antenna. In this paper, a multi-beam design of a reflectarray antenna by using first-order aberration is proposed. The validity of the design method is then quantitatively verified through simulations.
This paper considers the observer design problem for the SISO Lur'e differential inclusion system. The feature of the observer lies that it does not hold any set-valued mappings. Different from the current works, the system with relative degree more than one is studied in this paper, and the observer is constructed by the filtering transformation method. A numerical example is simulated to show the...
An incentive design method is proposed for incentive-based demand response programs targeting residential consumers. Consumers are modelled as decision-makers and their models represent, unlike existing models, dynamical nature of power consumption behaviors. The design is done based on inverse optimization. The degree of freedom that exists in the solution can be effectively utilized to make the...
Design of electrical machine is a complex multilevel task. Design process takes into account the technologies for the electrical machines production, quality standards, economic indicators and many other factors associated with electric machines. The design and calculation of electrical machine has a link with the technology and production fields. The main goal for each electrical machine designer...
Modern passenger cars are no longer mechanically dominated systems; their customer value and physical behavior are greatly influenced by electric/electronic systems and software. Therefore technical and economic importance of electric and electronic functions is increasing in the automotive industry over the last few years. Today's demands on infotainment- and driver assistance systems and the ambition...
This study rewrote a fractional-order particle swarm optimizer algorithmic equation and used an improved uniform design method (IUDM) to find the best combination for parameters of FPSO. Compared to PSO, FPSO makes a high convergence rate. In the improved FPSO, there are 4 parameters to influence effectiveness. Uniform design is an experimental method and suitable for multiple parameters and multiple...
This paper presents an efficient design method used to implement high performance multi-mode memory controllers which fits different applications with different demands. The proposed design method is based on the use of dynamic partial reconfiguration (DPR) to commute from mode to another using time-multiplexing on the same chip region to save considerable area and enable usage of low-cost FPGAs....
Modeling the lightning attachment process is required on any method to design the air-termination elements of a lightning protection system. An attachment model that adopts the leader progression concept is used to evaluate the three-dimensional attractive zone of a lightning rod on a common 54-m tall building in Sao Paulo, Brazil. Electric field and scalar potential distributions are calculated numerically...
The paper presents a combined design method based on a direct and inverse computing algorithm and reverse engineering procedure for an existing centrifugal pump impeller in order to enhance the hydraulic efficiency. An iterative methodology is proposed based on identification of the centrifugal pump impeller, simulation in order to obtain the enhanced hydraulic efficiency and a new geometry followed...
This paper mainly presents a design of optimized (15, 4) parallel counter. When testing the design with 15 rows of inputs, synthesis report of our design performs better in respect of delay, area and power consumption than other two existing design. This result shows that processes such as partial product reduction in a multiplier or column-addition in a matrix could be more efficient, especially...
This paper investigates the fuzzy H∞ filter design issue for nonlinear systems with time-varying delay. In order to obtain less conservative fuzzy H∞ filter design method, a novel integral inequality is employed to replace the conventional Lebniz-Newton formula to analyze the stability conditions of the filtering error system. Besides, the information of the membership functions is introduced in the...
In this work is present the comparison of two methods of controllers design and the model of a single phase inverter for island mode operation in a microgrid. These methods are: direct current conventional method based on frequency analysis that allows the design of a proportional-integral controller and a second method based on dc-ac coordinate transformation, that allows the design of a proportional...
Hybrid modular multilevel converter (MMC) is considered as a promising topology to deal with DC fault in MMC based high-voltage direct current (HVDC) due to the negative output from full-bridge sub-module (FBSM). In addition, the modulation index can be promoted with the negative output, which can enhance the AC voltage and transmission power in steady state. This paper focuses on this situation that...
In this paper, an LLC resonant converter design methodology for battery charger based on mode analysis is presented. The accuracy of DC gain curve obtained by mode analysis is much higher than that by FHA. Conduction loss and switching loss can be minimized by reasonably configuring charging trajectory on the mode distribution map. ZVS and ZCS can be realized during whole charging process. Finally,...
In this paper, design considerations on the three phase PWM rectifier are presented. New methods, to compute the value assigned to the AC source voltage and the line filter, are given. The design approach of the AC source voltage is based on the value affected to the DC link voltage and power transfer. This approach leads to an optimal value of the source voltage ensuring a maximal power flowing to...
In this paper, a waveform design method utilizing the low maximum side-lobe in the synthetic range profile as the criterion for the random hopping frequency radar is proposed. Firstly, the center range ambiguity function which represents matched filtering output of transmitted signal is derived. And the output signal to noise ratios (SNR) of it and the synthetic range profile based on correlation...
In order to suppress the range sidelobes and the grating lobes of the linear stepped frequency waveform, a non-linear stepped frequency (NSF) waveform design method by using range ambiguity function is proposed in this paper. Firstly, the reason of the sidelobes and the grating lobes occurring is analyzed based on range ambiguity function. Secondly, through compare the difference between the modified...
Recently, a cloaking technology using reflecting elements has been marked. Cloaking devices using reflectarray have simple and very thin structure, so they are especially suitable for cloaking. This paper proposes a carpet cloaking using wideband reflectarray.
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