The Experts below are selected from a list of 10749 Experts worldwide ranked by ideXlab platform
Wen-jiao Liao - One of the best experts on this subject based on the ideXlab platform.
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Multistep Cylindrical Structure Design for Wideband Radar Cross Section Reduction at Normal Incidence
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Shin-hon Chen, Wen-jiao LiaoAbstract:A wideband radar cross section (RCS) reduction measure applicable to rod-like targets is proposed. This technique uses the differences in radii among multistep Cylindrical Structures to create a phase reversal for backscattering cancellation. In order to broaden the reduction bandwidth, a simple one-step design is evolved into a multistep one using the binomial expansion method. Its superior performance is verified via numerical simulations based on the physical optics (PO) and full-wave method. Under normal incidence, a 2.45:1 bandwidth ratio is achieved for more than 20-dB RCS reduction with a live-step design. Effects of critical design parameters such as the number of steps and the cylinder displacement order are examined. This approach can be employed on rod-like defense targets. A series of simulations that emulate a periscope protruding from the sea surface is conducted to demonstrate the applicability of the proposed technique.
Shin-hon Chen - One of the best experts on this subject based on the ideXlab platform.
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Multistep Cylindrical Structure Design for Wideband Radar Cross Section Reduction at Normal Incidence
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Shin-hon Chen, Wen-jiao LiaoAbstract:A wideband radar cross section (RCS) reduction measure applicable to rod-like targets is proposed. This technique uses the differences in radii among multistep Cylindrical Structures to create a phase reversal for backscattering cancellation. In order to broaden the reduction bandwidth, a simple one-step design is evolved into a multistep one using the binomial expansion method. Its superior performance is verified via numerical simulations based on the physical optics (PO) and full-wave method. Under normal incidence, a 2.45:1 bandwidth ratio is achieved for more than 20-dB RCS reduction with a live-step design. Effects of critical design parameters such as the number of steps and the cylinder displacement order are examined. This approach can be employed on rod-like defense targets. A series of simulations that emulate a periscope protruding from the sea surface is conducted to demonstrate the applicability of the proposed technique.
Fernand Ellyin - One of the best experts on this subject based on the ideXlab platform.
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two scale analysis of a filament wound Cylindrical Structure and application of periodic boundary conditions
International Journal of Solids and Structures, 2008Co-Authors: Yunfa Zhang, Fernand EllyinAbstract:Abstract A two-scale numerical approach to predict the effective in-plane properties of helical filament-wound thin-walled Cylindrical tubes is provided. A meso-scale repeated unit cell (RUC) model for a filament-wound tube is established according to the manufacturing process, in which cross-overs, undulations and overlaps of fibre bundles are described using a bottom-up solid modelling technique. An approach to implement the general periodic boundary conditions in a finite element analysis scheme is also presented. As an application example, the effective in-plane elastic constants of glass fibre/epoxy filament-wound tubes are predicted and the influences of the number of the winding circuits and the shape of the fibre bundles are analyzed and discussed. In addition, the stress/strain distribution in the RUC is obtained which provides the essential information on the stress/strain concentration due to fibre cross-over/undulation/overlap. This then indicates the location where damage will initiate.
Chu-feng Hu - One of the best experts on this subject based on the ideXlab platform.
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The analysis of multistep Cylindrical Structure on the dielectric surface for wideband radar cross section reduction at normal incidence
2017 International Applied Computational Electromagnetics Society Symposium (ACES), 2017Co-Authors: Chonghua Fang, Chu-feng HuAbstract:In this paper A wideband radar cross section (RCS) reduction Structure applicable to rod-like targets on the dielectric surface is studied. The influence of dielectric surface lie chiefly with narrow frequency band with no more than 5dB. In addition, as for the typical frequency point at 9GHz, the discrepancy of RCS sweep of the multistep Cylindrical Structure near normal incidences between with and without surface is minor.
Yunfa Zhang - One of the best experts on this subject based on the ideXlab platform.
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two scale analysis of a filament wound Cylindrical Structure and application of periodic boundary conditions
International Journal of Solids and Structures, 2008Co-Authors: Yunfa Zhang, Fernand EllyinAbstract:Abstract A two-scale numerical approach to predict the effective in-plane properties of helical filament-wound thin-walled Cylindrical tubes is provided. A meso-scale repeated unit cell (RUC) model for a filament-wound tube is established according to the manufacturing process, in which cross-overs, undulations and overlaps of fibre bundles are described using a bottom-up solid modelling technique. An approach to implement the general periodic boundary conditions in a finite element analysis scheme is also presented. As an application example, the effective in-plane elastic constants of glass fibre/epoxy filament-wound tubes are predicted and the influences of the number of the winding circuits and the shape of the fibre bundles are analyzed and discussed. In addition, the stress/strain distribution in the RUC is obtained which provides the essential information on the stress/strain concentration due to fibre cross-over/undulation/overlap. This then indicates the location where damage will initiate.
