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

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.

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

scholarly journals Design, Fabrication, and Testing of Active Skin Antenna with 3D Printing Array Framework

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Jinzhu Zhou ◽  
Haitao Li ◽  
Le Kang ◽  
Baofu Tang ◽  
Jin Huang ◽  
...  
Keyword(s):  
3D Printing ◽  
Microstrip Antenna ◽  
High Speed ◽  
Experimental Testing ◽  
Bayesian Optimization ◽  
Load Bearing ◽  
Manufacturing Method ◽  
Structural Surface ◽  
Control Circuits ◽  
Smart Skin

An active skin antenna with structural load-bearing and electromagnetic functions is usually installed in the structural surface of mobile vehicles such as aircrafts, warships, and high-speed train. This paper presents the design, fabrication, and testing of a novel active skin antenna which consists of an encapsulation shell, antenna skin, and RF and beam control circuits. The antenna skin which consists of the facesheet, honeycomb, array framework, and microstrip antenna elements was designed by using Bayesian optimization, in order to improve the design efficiency. An active skin antenna prototype with 32 microstrip antenna elements was fabricated by using a hybrid manufacturing method. In this method, 3D printing technology was applied to fabricate the array framework, and the different layers were bonded to form the final antenna skin by using traditional composite process. Some experimental testing was conducted, and the testing results validate the feasibility the proposed antenna skin structure. The proposed design and fabrication technique is suitable for the development of conformal load-bearing antenna or smart skin antenna installed in the structural surface of aircraft, warships, and armored vehicles.

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

Smart Structures Theory

2009 ◽  
Author(s):  
Inderjit Chopra ◽  
Jayant Sirohi
Keyword(s):  
Smart Structures

Load-Bearing in the Ovine Medial Tibial Condyle: Effect of Meniscectomy

1993 ◽  
Vol 06 (02) ◽  
pp. 100-104 ◽  
Author(s):  
D. M. Pickles ◽  
C. R. Bellenger
Keyword(s):  
Knee Joint ◽  
Contact Area ◽  
Mammalian Species ◽  
Total Removal ◽  
Load Bearing ◽  
Human Knee ◽  
Biochemical Effects ◽  
Pressure Sensitive ◽  
Medial Meniscectomy ◽  
Tibial Condyle

SummaryTotal removal of a knee joint meniscus is followed by osteoarthritis in many mammalian species. Altered load-bearing has been observed in the human knee following meniscectomy but less is known about biochemical effects of meniscectomy in other species. Using pressure sensitive paper in sheep knee (stifle) joints it was found that, for comparable loads, the load-bearing area on the medial tibial condyle was significantly reduced following medial meniscectomy. Also, for loads of between 50 N and 500 N applied to the whole joint, the slope of the regression of contact area against load was much smaller. Following medial meniscectomy, the ability to increase contact area as load increased was markedly reduced.The load bearing area on the medial tibial condyle was reduced following meniscectomy.

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