Development and testing of a conformal load-bearing smart skin antenna structure

1999 ◽  
Author(s):  
Jonathan Bartley-Cho ◽  
Allen Lockyer ◽  
Kevin Alt ◽  
Daniel Coughlin ◽  
Jayanth Kudva ◽  
...  
Keyword(s):  
Antenna Structure ◽  
Load Bearing ◽  
Smart Skin

Parametric Study on Compression Deformation Behavior of Conformal Load-Bearing Smart Skin Antenna Structure

2004 ◽  
Vol 261-263 ◽  
pp. 663-668 ◽  
Author(s):  
Kwang Joon Yoon ◽  
Young Suk Kim ◽  
Young Bae Kim ◽  
J.D. Lee ◽  
Hyun Chul Park ◽  
...  
Keyword(s):  
Parametric Study ◽  
Compressive Load ◽  
Element Model ◽  
Design Data ◽  
Antenna Structure ◽  
Load Bearing ◽  
Shear Moduli ◽  
Design Variables ◽  
Compressive Loads ◽  
Smart Skin

In this paper, a simple conformal load-bearing antenna structure smart skin with a multi-layer sandwich structure composed of carbon/epoxy, glass/epoxy, and a dielectric polymer was designed and fabricated. The mechanical properties of each material in the designed smart skin were obtained from experiments. Tests and analyses were conducted to study the behavior of the smart skin under compressive loads. The designed smart skin failed due to buckling before compression failure. The stresses of each layer and the first failed layer of the smart skin were predicted using MSC/NASTRAN. The finite element model was verified by comparing the numerical results from geometrical linear/nonlinear analyses with the measured data. The numerically predicted structural behavior of the smart skin agreed well with the experimental data. The results showed that the carbon/epoxy layer took charge of most of the compressive load, and the first failure occurred in the dielectric layer while the other layers remained safe. A numerical model was used to obtain design data from the parametric study. The effect of changing the design variables on the buckling and compressive behavior of the smart skin was also investigated. As a result, it was confirmed that the transverse shear moduli of the honeycomb core had a serious impact on the buckling load of the smart skin when the shear deformation was considerable.

Structural design of conformal load-bearing array antenna structure (CLAAS)

2017 ◽  
Vol 26 (sup1) ◽  
pp. 29-42 ◽  
Author(s):  
Sang Min Baek ◽  
Myung Gyun Ko ◽  
Min Sung Kim ◽  
Young Sik Joo
Keyword(s):  
Structural Design ◽  
Array Antenna ◽  
Antenna Structure ◽  
Load Bearing

Compressive Deformation Analysis of Smart Skin Structure Embedded with Round Shape Antenna

2006 ◽  
Vol 321-323 ◽  
pp. 963-967 ◽  
Author(s):  
June Sung Joe ◽  
Hoon Cheol Park ◽  
Kwang Joon Yoon ◽  
Nam Seo Goo
Keyword(s):  
Dielectric Material ◽  
Experimental Tests ◽  
Nonlinear Finite Element ◽  
Deformation Analysis ◽  
Finite Element Analyses ◽  
Antenna Structure ◽  
Round Shape ◽  
Compressive Loads ◽  
Smart Skin ◽  
Structural Layer

In this paper, a smart skin, i.e. a conformal load-bearing antenna structure, which is a multi-layer sandwich structure composed of carbon/epoxy, glass/epoxy and dielectric material, designs, analyses, fabrications and tests are conducted. Mechanical properties of each structural layer of the designed smart skin are obtained from experimental tests. Tests and analyses are conducted to study the deformation behavior of the smart skin under compressive loads. The measured data are compared with the numerical results from geometrically linear/nonlinear finite element analyses. Numerical prediction for the buckling load of the smart skin agreed well with the experimental data.

FEA Evaluation of the Mechanical and Electromagnetic Performance of Slot Log-Spiral Antennas in Conformal Load-Bearing Antenna Structure (CLAS)

2011 ◽  
Author(s):  
Ali Daliri ◽  
Chun H. Wang ◽  
Sabu John ◽  
Amir Galehdar ◽  
Wayne S. T. Rowe ◽  
...  
Keyword(s):  
Electromagnetic Scattering ◽  
Mechanical Characteristics ◽  
Spiral Antenna ◽  
Scattering Parameter ◽  
Radiation Characteristics ◽  
Element Analysis ◽  
Spiral Antennas ◽  
Antenna Structure ◽  
Load Bearing ◽  
Electromagnetic Performance

Conformal load-bearing antenna structures (CLAS) have been attracting the attention of aerospace industries in recent years. This type of multifunctional structures combines the features of conventional antennas with load-bearing capacity and has important applications in military and commercial airplanes especially for Unmanned Aerial Vehicles (UAVs). Equiangular slot spiral antennas are an alternative to traditional rectangular slots because of its wideband radiation characteristics. However, the mechanical characteristics of such a spiral antenna integrated into a structure are so far largely unexplored. In this paper, the electromagnetic (scattering parameter, radiation pattern and gain) and mechanical properties (stress concentration factor (SCF)) of spiral antennas is investigated using finite element analysis (FEA). The results lead to a recommendation for using this type of antenna for future CLAS concepts.

The Development of a Multi-Functional Composite Embedded Smart-Skin Antenna Structure

2012 ◽  
Vol 490-495 ◽  
pp. 2743-2747 ◽  
Author(s):  
Zong Hong Xie ◽  
Wei Zhao ◽  
Lei Li ◽  
Peng Zhang
Keyword(s):  
Antenna Arrays ◽  
Bending Test ◽  
Electrical Performance ◽  
Honeycomb Core ◽  
Antenna Structure ◽  
Functional Composite ◽  
Three Point Bending ◽  
Simulation And Experiment ◽  
Design Requirements ◽  
Smart Skin

This paper focuses on the research and development of the “Multi-functional Composite Embedded Smart-Skin Antenna (MECSSA) Structure” with load-bearing, shape maintaining and communication capabilities. MECSSA structure consists of top and bottom composite thin facesheet, honeycomb core, 4 by 8 micro-strip antenna arrays located among honeycomb core and some adhesive. Simulation and experiment methods were used to study the performance of MECSSA structure. Through the study we found that adhesive is the significant factor of affecting the electrical performance of MECSSA structure, especially for radio frequency (RF) and it must take into account in the research. There may be two ways to avoid the influence of adhesive: compensation and separation. Three point bending test indicated that the strength of MECSSA structure satisfies design requirements.

Design and development of a conformal load-bearing smart skin antenna: overview of the AFRL Smart Skin Structures Technology Demonstration (S3TD)

1999 ◽  
Author(s):  
Allen J. Lockyer ◽  
Kevin H. Alt ◽  
Daniel P. Coughlin ◽  
Michael D. Durham ◽  
Jayanth N. Kudva ◽  
...  
Keyword(s):  
Design And Development ◽  
Load Bearing ◽  
Technology Demonstration ◽  
Smart Skin

Effect of Filler Materials on the Performance of Conformal Load-Bearing Spiral Antennas

2012 ◽  
Author(s):  
Ali Daliri ◽  
Sabu John ◽  
Chun H. Wang ◽  
Amir Galehdar ◽  
Wayne S. T. Rowe ◽  
...  
Keyword(s):  
Aerodynamic Drag ◽  
Filler Materials ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Spiral Antennas ◽  
Antenna Structure ◽  
Load Bearing ◽  
Structural Reinforcement ◽  
Load Carrying ◽  
Promising Solution

The slots in spiral antennas induce stress concentrations and hence may adversely affect the load-carrying capacity of the structural antenna. To minimise the detrimental effect of the slots, appropriate fillers are required to provide structural reinforcement without compromising the radar performance of the antenna. This paper presents an investigation of the effects of electrical and mechanical properties of potential filler materials on the performance of slot spiral antennas. Finite element analysis is carried out for a slot spiral that is designed to work in the C-Band range of frequencies (4–8 GHz). Computational simulations performed using commercial software packages ANSYS® and HFSS® show that by using commercially available filler materials the stress concentration factor of the spiral slot can be reduced by 20%. The results from this research enhance the previously introduced advantages of this type of conformal load-bearing antenna structure (CLAS). This CLAS concept provides a promising solution of replacing conventional externally mounted antennas, thus reducing aircraft weight and aerodynamic drag.

Smart skin conformal load-bearing antenna and other smart structures developments

1997 ◽  
Author(s):  
Mark Hopkins ◽  
James Tuss ◽  
Allen Lockyer ◽  
Kevin Alt ◽  
Robert Kinslow ◽  
...  
Keyword(s):  
Smart Structures ◽  
Load Bearing ◽  
Smart Skin

scholarly journals Active Flutter Suppression of Smart-Skin Antenna Structures with Piezoelectric Sensors and Actuators

Aerospace ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 257
Author(s):  
Chang-Yull Lee ◽  
Ji-Hwan Kim
Keyword(s):  
Geometrical Nonlinearity ◽  
Shear Deformation Theory ◽  
Numerical Results ◽  
Piezoelectric Sensors ◽  
Linear Quadratic ◽  
Sensors And Actuators ◽  
Antenna Structure ◽  
First Order ◽  
Piezoelectric Sensors And Actuators ◽  
Smart Skin

A smart-skin antenna structure is investigated for active flutter control with piezoelectric sensors and actuators. The skin antenna is designed as a multilayer sandwich structure with a dielectric polymer to perform the role of antenna or radar structures. The governing equations are developed according to the first-order shear deformation theory, and von Karman strain–displacement relationships are used for the moderate geometrical nonlinearity. To consider the supersonic airflow, first-order piston theory is performed for the aerodynamic pressures. The linear quadratic regulator (LQR) method is applied as a control algorithm, and Newmark’s method is studied to obtain the numerical results. In the present study, the effects of placements and shape of piezoelectric patches are discussed on the flutter control of the model in detail. In addition, the numerical results show that the skin antenna model can effectively suppress the panel flutter behaviors of the model, optimal conditions of piezoelectric patches are obtained for skin antenna structures.

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