Reconfigurable terahertz Vivaldi antenna based on a hybrid graphene‐metal structure

2020 ◽  
Vol 30 (5) ◽  
Author(s):  
Jiangliang Jin ◽  
Zhiqun Cheng ◽  
Jin Chen ◽  
Tao Zhou ◽  
Chunlin Wu ◽  
...  
Keyword(s):  
Metal Structure ◽  
Vivaldi Antenna

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

Refinement of metal structure in arc surfacing under the effect of longitudinal magnetic field

2019 ◽  
Vol 2019 (2) ◽  
pp. 19-21
Author(s):  
A.D. Razmyshlyaev ◽  
◽  
M.V. Ageeva ◽  
E.V. Lavrova ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Metal Structure

Modernization of the Metal Structure of the Grader Working Equipment

2020 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Mikhail Doudkin ◽  
Alina Kim ◽  
Andrey Savelyev ◽  
Mikhail Zhileikin ◽  
Vladimir Gribb ◽  
...  
Keyword(s):  
Metal Structure

Modeling the Dynamic Load of Loader Cranes Metal Structure with Excessive Backlashes in Sections Hinge Joints

2018 ◽  
Vol 12 (2) ◽  
pp. 176
Author(s):  
Alexander V. Lagerev ◽  
Igor A. Lagerev
Keyword(s):  
Dynamic Load ◽  
Metal Structure

Vivaldi Antenna for Ground Penetrating Radar Applications

2018 ◽  
Vol 50 (001) ◽  
pp. 07-12 ◽  
Author(s):  
S. S. MEMON ◽  
A. A. JAMALI ◽  
M. R. ANJUM ◽  
M. M. MEMON ◽  
S. F. QADRI
Keyword(s):  
Ground Penetrating Radar ◽  
Radar Applications ◽  
Vivaldi Antenna ◽  
Ground Penetrating

Comparison Study of Hilbert Sierpinski and Koch Fractal Structure on Coplanar Vivaldi Antenna for L/S band Application

2020 ◽  
Author(s):  
Nurhayati Nurhayati ◽  
Alexandre M. De Oliveira ◽  
Antonio. M. de Oliveira ◽  
Raimundo Eider Figueredo ◽  
Marco Antonio B. Pinto ◽  
...  
Keyword(s):  
Fractal Structure ◽  
Comparison Study ◽  
Vivaldi Antenna ◽  
Koch Fractal

A Wideband Miniaturized Tapered Slot Vivaldi Antenna

2020 ◽  
Author(s):  
Memoona Farooq ◽  
Saba Fatima ◽  
Hammad M. Cheema
Keyword(s):  
Vivaldi Antenna
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