Numerical Feasibility Analysis of the Extra-light Weight Structure Tensairity on Large Airships

2015 ◽  
Author(s):  
Anna Suñol ◽  
Tao Yang ◽  
Dean Vucinic
Keyword(s):  
Feasibility Analysis ◽  
Light Weight ◽  
Weight Structure

Laminated Type Isolation Device for Light Weight Structure Using Urethane Elastomer

2017 ◽  
Author(s):  
Kengo Goda ◽  
Osamu Furuya ◽  
Kohei Imamura ◽  
Kenta Ishihana
Keyword(s):  
Seismic Isolation ◽  
Base Isolation ◽  
Light Weight ◽  
Loading Test ◽  
Isolation System ◽  
Seismic Safety ◽  
Base Isolation System ◽  
Weight Structure ◽  
Isolation Device ◽  
Urethane Elastomer

At the present, base isolation system has been recognized by general earthquake resistant technique since the Great Hanshin Earthquake 1995. The seismic isolation will be aggressively applied to not only architectural and civil structures but also various structures, because the effectiveness on seismic safety had been demonstrated again in the Great East Japan Earthquake. In generally, although the base isolation system is divided into laminated rubber bearing type and friction sliding bearing type. In the case of former type, shape factor, maximum or minimum outer shapes and so on are restricted by the material characteristics in visco-elastic material. In general, the isolation structure is used in high damping rubber. However, we pay attention to base isolation using urethane elastomer. Urethane elastomer has excellent elasticity, mechanical strength, abrasion resistance, weather resistance, oil resistance, impact resistance the absorbent, anti-vibration and excellent low-temperature properties. Furthermore, it is possible to impart various characteristics by a combination of isocyanate and polyol and chain extender, requires no large-scale apparatus, it has the advantage molecular design is easy. In previous study, the research and development of laminated type base isolation device using urethane elastomer was carried out to upgrade a seismic safety for various structures. The fundamental characteristics was investigated from several loading test by using various experimental devices, and the design formula for the stiffness and equivalent damping coefficient is formulated as an approximate expression of mechanical characteristics until now. It was confirmed that urethane elastomer is not hardening up to 500% shear strain. Moreover, the experimental examination for aged deterioration in the urethane material has been continuously carried out. As the results, it was confirmed that the laminated type seismic isolation device using urethane elastomer is possible to develop as a practicable device from the stable mechanical properties as considering in design step. In this study, the small-scale laminated type base isolation device using urethane elastomer is advanced to the direction of further technical upgrading and of scale down for light-weight structure as a sever rack. The first stage, basic properties of the urethane elastomer has been investigated by loading test. Furthermore, the design equation is created by loading test using urethane elastomer. The validity of the design equation has been confirmed. The second stage, the compression creep test with laminated type base isolation device has been investigated to confirm an effect on light-weight mechanical devices.

scholarly journals An Analytic Verification on Fracture Behavior of Adhesion Exfoliation with Out-plane Shear Mode due to Tapered Angles of 6°and 8° at TDCB Made of Unidirectional Laminated CFRP

2019 ◽  
Vol 8 (2S6) ◽  
pp. 185-189
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Method ◽  
Structure Design ◽  
Light Weight ◽  
Analysis Method ◽  
Gas Emission ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Weight Structure

Because of environmental issues, the regulations on gas emission from fossil fuels become stricter. Some investigations are being carried out actively to change the fossil fuel power into electrical power. Researches on the reduction of weight in the transportation machine is also executed. Weight reduction is one of the methods of reducing the gas emission and increasing the range of electrically powered machines. The method of weight reduction includes the development of light weight material and light weight structure design method. FRP is the most representative light weight material. Among various FRP materials, (CFRP) has the highest specific strength. Light weight structure design method includes the method of designing the structure by converting the bonding method with bolts and rivets to adhesion method with the use of adhesives. In order to pursue the research on the adhesive structure design method, the research on adhesion exfoliation by using CZM needs to be carried out. There are the researches with various methods in accordance with the style of adhesion exfoliation load and material designs. In this study, the adhesion exfoliation on the tearing fracture of tapered double cantilever beam configuration was applied to the research. Research model was composed by applying the gradient angles of 6° and 8° to TDCB. The model with the gradient angle of 8° has less fracture due to adhesion than that of 8°. The basic data on structural design of adhesion structure were provided by comparatively analyzing the research models. This research was carried out by using finite element analysis method in this study. Finite element analysis method has the advantage of reducing the cost and time taken for experiments in researches. Therefore, the finite element analysis program, ANSYS, was used in this study.

Habitat for Space and Lunar Environments: Light Weight Structure Concept

2008 ◽  
Author(s):  
Paul Slysh ◽  
Peter Rohl ◽  
John Carsten ◽  
Andrew Jabola
Keyword(s):  
Light Weight ◽  
Weight Structure

Light Weight Structure Development Using Non Linear Load Cases For Suspension Components (Cradle)

2016 ◽  
Author(s):  
Subash Sudalaimuthu ◽  
Mohamed Sithik ◽  
Roberto Pesce Jr ◽  
Chandra Mouli Sankaran
Keyword(s):  
Light Weight ◽  
Structure Development ◽  
Linear Load ◽  
Non Linear ◽  
Weight Structure ◽  
Non Linear Load

scholarly journals Development of a Flexible, Light Weight Structure, Adaptable to any Space through a Shape Shifting Feature

2016 ◽  
Vol 155 ◽  
pp. 426-441 ◽  
Author(s):  
Fenando Cunha ◽  
Carlos Mota ◽  
Ana Reis ◽  
Paulo Marques ◽  
Rui Pinto ◽  
...  
Keyword(s):  
Light Weight ◽  
Weight Structure

Study on Simple Vibration Attenuation System for Light Weight Structure

2007 ◽  
Author(s):  
Osamu Furuya ◽  
Hiroshi Kurabayashi
Keyword(s):  
Large Scale ◽  
Base Isolation ◽  
Scale Structure ◽  
Small Scale ◽  
Response Analysis ◽  
Light Weight ◽  
Seismic Safety ◽  
Small Scale Structure ◽  
Vibration Attenuation ◽  
Weight Structure

Various vibration attenuation methods such as a base isolation and vibration control are suggested as seismic safety technique for large scale architectural and civil structure, and these methods have been practical used now. In recent years, these vibration reduction technology begins to be applied to a small scale structure. In case that the technology is applied to a small scale structure, specifications and a cost of the device must be examined well. In this study, a vibration attenuation system for light weight structure with low cost and simple mechanizm. This paper describes the effectiveness of the proposed vibration attenuation system which was evaluated from preliminary seismic response analysis.

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