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排序方式: 共有215条查询结果,搜索用时 31 毫秒
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Soheil Khosrogorji Sepehr Soori Hossein Torkaman 《International Journal of Circuit Theory and Applications》2019,47(10):1645-1663
In this paper, a new design procedure for LLC converter has been introduced. In fact, this method is a computer-based design algorithm based on a numerical technique. In the process of designing, the value of the resonant element is obtained by solving the LLC converter fundamental equation. This converter will be controlled by using state feedback, such as output voltage variable. As a matter of fact, in a control system, the change of output voltage (because of load variation) will affect the switching frequency, so the output voltage will be tuned. In the designing process, the fundamental equations of LLC converter are obtained, and the value of the resonant elements is calculated. Also, a comparison analysis is carried out between the proposed and typical methods. The simulation is done to investigate the validity of the proposed method. Moreover, a prototype is manufactured, and the experimental test is done to evaluate its applicability. 相似文献
3.
Mohsen Farahani Soheil Ganjefar 《International Journal of Control, Automation and Systems》2012,10(4):744-752
In this paper, an intelligent controller is proposed to control a static synchronous series compensator (SSSC) in order to mitigate subsynchronous resonance (SSR) oscillations in a power system. This intelligent controller is an adaptive self-tuning PID controller. To train the PID controller, the gradient descent method is employed where the learning rate is adapted in every iteration in order to accelerate the speed of convergence. This control scheme also requires a wavelet neural network (WNN) to identify the controlled system dynamic. To update the parameters of WNN, the gradient descent (GD) along with the adaptive learning rates derived by the Lyapunov method is used. The computer simulations are used to show the ability of the proposed controller. In addition, the performance of the proposed controller is compared with another self-tuning PID controller. The results demonstrate that the proposed controller has a successful performance in minimizing the SSR. 相似文献
4.
Bioinspired Nacre‐Like Ceramic with Nickel Inclusions Fabricated by Electroless Plating and Spark Plasma Sintering
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Zhe Xu Jiacheng Huang Cheng Zhang Soheil Daryadel Ali Behroozfar Brandon McWilliams Benjamin Boesl Arvind Agarwal Majid Minary‐Jolandan 《Advanced Engineering Materials》2018,20(5)
5.
M. Jalaal M.G. Nejad P. Jalili M. Esmaeilpour H. Bararnia E. Ghasemi Soheil Soleimani D.D. Ganji S.M. Moghimi 《Computers & Mathematics with Applications》2011,61(8):2267-2270
He’s homotopy perturbation method is applied to obtain exact analytical solutions for the motion of a spherical particle in a plane couette flow. It is demonstrated that the applied analytical method is very straightforward in comparison with existing techniques. Furthermore, it is decidedly effectual in terms of accuracy and rapid convergence. The formulation of the problem is presented in the text as well as the analytical and numerical procedures. The current results can be used in different areas of particulate flows. 相似文献
6.
R. Awad M. Roumié A. I. Abou-Aly S. A. Mahmoud M. M. Barakat 《Journal of Superconductivity and Novel Magnetism》2012,25(2):273-291
Superconducting samples of type Bi1.8Pb0.4Sr2Ca2.1Cu3−x
Ru
x
O10+δ
, (Bi, Pb)-2223, with 0.0≤x≤0.4 and type Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x
Ru
x
O7−δ
, (Tl, Pb)/Sr-1212, with 0.0≤x≤0.525 were synthesized using the standard solid-state reaction technique. The lattice parameters and the surface morphology
for these samples were determined using X-ray powder diffraction (XRD) and scanning electron microscope (SEM) measurements,
respectively. All element-contents of the samples prepared were estimated from the electron dispersive X-ray (EDX) technique,
and their results were compared with those obtained from particle-induced X-ray emission (PIXE). In addition, the oxygen-content
was determined using elastic Rutherford backscattering spectroscopy (RBS) technique at 3 MeV proton beam. The superconducting
transition temperature T
c and the hole carrier concentration P were determined from the electrical resistivity measurement. The data of both T
c and P for Bi1.8Pb0.4Sr2Ca2.1Cu3−x
Ru
x
O10+δ
and Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x
Ru
x
O7−δ
phases increased up to x=0.05 and 0.075, respectively and then they decreased as x increased. The superconductivity was completely destroyed around x=0.4 and 0.525 for (Bi, Pb)-2223 and (Tl, Pb)/Sr-1212 phases, respectively. The normal-state electrical resistivity data were
analyzed using the two and three dimensional variable range hopping (2D-VRH and 3D-VRH) and the Coulomb gab (CG). 相似文献
7.
Ganjefar Soheil Afshar Mohammad Sarajchi Mohammad Hadi Shao Zhufeng 《International Journal of Control, Automation and Systems》2018,16(5):2405-2420
International Journal of Control, Automation and Systems - In this study, a new controller method based on wavelet neural adaptive proportional plus conventional integral-derivative (WNAP+ID)... 相似文献
8.
The paper studied by Subbaraj et al. (2009) considers the feasibility of using self adaptive real-coded genetic algorithm for enhancement of combined heat and power economic dispatch. The paper includes some problems about the considered feasible operating region. In this discussion, the controversial point of the paper are given. 相似文献
9.
10.
Fang-Le PENG Yong-Kang QIAO Soheil SABRI Behnam ATAZADEH Abbas RAJABIFARD 《Frontiers of Structural and Civil Engineering》2021,15(1):20-45
The utilization of urban underground space (UUS) offers an effective solution to urban problems but may also negatively affect urban development. Therefore, UUS development needs better concerted guidelines to coordinate various urban systems and the multiple components of the underground world. Sustainable Development Goals (SDGs), which should be viewed as important yardsticks for UUS development, do not explicitly mention urban underground space, although many of them are affected by both the positive and negative consequences of its development. To fill this gap, this review lays the foundations of relevant UUS concepts and uses exemplary cases to reveal that 11 out of 17 SDGs can be linked with UUS uses. These linkages also manifest that land administration, integrated planning, architectural design, and construction technology are critical dimensions for increasing the contributions of UUS to the realization of SDGs. To achieve multi-disciplinary synergies among these four critical dimensions, a collaborative approach framework based on spatial data infrastructure is required. Thus, this work provides academics and practitioners with a holistic view of sustainable UUS development. 相似文献