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Gupta B.,Aerial Delivery Research and Development Establishment
Defence Science Journal | Year: 2010

Aerial Delivery Research & Development Establishment (ADRDE) was started at Kanpur during latter part of 1950's consisting of two Aerial Delivery Sections primarily for the indigenisation of Parachutes and related equipment for Para-dropping of men and materials. Today, the charter of ADRDE includes design & development of parachutes, Aerostat Systems, Aircraft Arrester Barrier Systems and Heavy-Drop Systems for both military and civilian applications. The technological competence built in Aeronautical, Textile, Mechanical and Electronics engineering has imparted ADRDE, a unique combination of know-how and capabilities to evolve new solutions in these fields, with emphasis on quality assurance. This paper highlights the design and development of technologies developed by ADRDE to stengthen the India's aerial delivery system and its future plans. © 2010, DESIDOC. Source


Kumar A.,Aerial Delivery Research and Development Establishment | Sati S.C.,Aerial Delivery Research and Development Establishment | Ghosh A.K.,Indian Institute of Technology Kanpur
Defence Science Journal | Year: 2016

The design, testing and realisation aspects during the development of a medium size aerostat envelope have been presented in this paper. The payload capacity of this aerostat is 300 kg at 1 km above mean sea level. The aerostat envelope is the aerodynamically shaped fabric enclosure part of the aerostat which generally uses helium for lifting useful payloads to a specified height. The envelope volume estimation technique is discussed which provides the basis for sizing. The design, material selection, testing and realisation aspects of this aerostat envelope are also discussed. The empirical formulas and finite element analysis are used to estimate the aerodynamic, structural and other design related parameters of the aerostat. Equilibrium studies are then explained for balancing forces and moments in static conditions. The tether profile estimation technique is discussed to estimate blow by distance and tether length. A comparison of estimated and measured performance parameters during trials has also been discussed. © 2016, DESIDOC. Source


Kumar A.,Aerial Delivery Research and Development Establishment | Sati S.C.,Aerial Delivery Research and Development Establishment | Ghosh A.K.,Indian Institute of Technology Kanpur
Advances in Intelligent Systems and Computing | Year: 2016

This paper presents estimation technique for equilibrium cable parameters applicable to aerostat balloon. The direct integration expressions are first expressed for uniform wind speed and density with height. Two types of polygonal approximations are then derived for numerical estimation which can directly be applied to varying wind speed as well as air density with height. A comparison of polygonal approximations is then carried out with direct integration for a small size aerostat assuming uniform wind speed and air density with height. Then the polygonal approximation is applied to a medium size aerostat considering the air density variation with height and thereby proposing a tether length factor for aerostat design. Finally, the method is applied for a practical case of both wind speed and air density variation with height. The results suggest that with a reasonable number of elements, the polygonal approximations can successfully be applied for estimation of equilibrium cable parameters for the aerostat balloon. © Springer Science+Business Media Singapore 2016. Source


Pal S.K.,Aerial Delivery Research and Development Establishment | Thakare V.B.,Aerial Delivery Research and Development Establishment | Singha G.,Aerial Delivery Research and Development Establishment | Verma M.K.,Aerial Delivery Research and Development Establishment
Indian Journal of Fibre and Textile Research | Year: 2011

The degradation behaviour of polyurethane (PU) coated nylon fabric and woven webbings made of nylon and polyester fibres when exposed to outdoor environment has been studied. The degradation behavior of these materials has also been studied under accelerated ageing using xenon lamp. The degradation behavior of the samples has been studied in terms of increase in gas permeability (for PU coated nylon fabric only), loss in breaking strength, work of rupture and extension-atbreak. In PU coated fabrics, even though the tensile strength loss after outdoor exposure is acceptable, the gas retention property of PU coatings deteriorates sharply and material becomes unusable. It is observed that in case of polyester webbing, the outdoor exposure and xenon arc exposure data correlate quite well, however no such finding is observed for nylon webbing. It also emerges out that during outdoor weathering, although the strength loss in polyester webbing is less than that of nylon, the loss in work of rupture is higher. The UV resistant (UVR) finish has been found to be quite effective on both nylon and polyester webbings. Source


Singh G.,Aerial Delivery Research and Development Establishment | Raza W.,Aerial Delivery Research and Development Establishment | Kumar S.B.,Aerial Delivery Research and Development Establishment | Thakare V.B.,Aerial Delivery Research and Development Establishment
Man-Made Textiles in India | Year: 2013

In laminates, the interlamination strength or peel strength between different layers is a critical parameter that determines suitability for fabrication of inflatable structure and usage life. Polyvinyl fluoride (PVF) film, available as Tedlar® from Dupont, being slightly inert in nature is not easily adherable with commonly available adhesives. The effects of surface treatment using sodium etch and corona treatment on lamination strength of PVF film and polyester (PET) film has been studied. Combinations of corona treatment on single and both films with two component solvent based polyurethane adhesives were tried. The results with sodium etch are not uniform whereas corona treatment has been found to significantly improve the adhesion between PVF and PET film. Source

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