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Institution

Defence Research and Development Laboratory

FacilityHyderabad, India
About: Defence Research and Development Laboratory is a facility organization based out in Hyderabad, India. It is known for research contribution in the topics: Mach number & Turbulence. The organization has 404 authors who have published 420 publications receiving 4183 citations. The organization is also known as: DRDL.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the relative effect of these resin reinforcements with NBR in comparison to the non-reinforced NBR rubber compound NBR-S under the same conditions has been investigated.
Abstract: Acrylonitrile-co-butadiene rubbers (NBR) reinforced with phenolic and benzoxazine resins (NBR–Ph and NBR–Bz respectively) are prepared by a novel method using co-curing. The relative effect of these resin reinforcements with NBR in comparison to the non-reinforced NBR rubber compound NBR–S under the same conditions has been investigated. It was found that these resins exist in the form of a localized, interpenetrating network structure in the NBR matrix. For both NBR–Ph and NBR–Bz composites, the tensile strength, tear strength and elongation at break increases compared to NBR–S. The tensile strength in particular was increased by about 91% for NBR–Ph and by about 109% for NBR–Bz. Thermogravimetric analysis (TGA) provides evidence for the superior thermal stability for NBR composites over NBR–S. A decrease in the swelling values are observed in the NBR composites and the retained tensile strength, elongation at break and modulus from thermal aging studies are found to be superior than NBR–S. These results have shown that both the phenolic and benzoxazine resins are effective reinforcements for NBR materials.

18 citations

Journal ArticleDOI
TL;DR: A brief survey of the existing techniques and current trends in tactical missile guidance is presented in this paper, where the authors present a brief review of the current techniques and trends in this field.
Abstract: The problem of tactical missile guidance is very challenging and has been treated using several basic metlfodologies in the past four decades. Major techniques can be grouped under classical guidance laws, modern guidance laws, l'aws for manoeuvring targets, predictive guidance for endgame scenario, and guidance laws based on intelligent control methods. Each technique has some advantages and disadvantages while implementing in a practical system. Guidance law selection is dictated by nature of flight profile like boost, midcourse, terminal homing, etc, and also miss-distance and a single-shot kill probability. This paper presents a brief survey of the existing techniques and current trends in tactical missile guidance.

17 citations

Journal ArticleDOI
27 Mar 2013
TL;DR: In this paper, the surface temperature of a high speed aerospace vehicle is predicted using a combination of Navier Stokes equations in the fluid domain and transient heat conduction equation in the solid domain.
Abstract: Conjugate heat transfer studies are presented for high speed aerospace vehicle using commercial CFD software. Navier Stokes equations in the fluid domain and transient heat conduction equations in the solid domain are solved simultaneously to obtain the skin temperature history and other flow parameters. The computational methodology is applied to predict the surface temperature of high speed aerospace vehicle after validating the methodology against experimental results. Validation cases include laminar flow past axisymmetric double cone at Mach 4.57 and turbulent flow past circular cylinder at Mach 6.7. Computed flow field including cold wall heat flux, surface temperature distribution, surface temperature history match nicely with experimental as well as other numerical results. Temperature dependent material properties are found to have significant effect on the surface temperature prediction. Computed surface temperature of a high speed aerospace vehicle show good overall match with flight measured v...

17 citations

Journal ArticleDOI
TL;DR: This paper discusses the application of an integrated approach for project modeling and proposes a new graphic tool called PACT for evaluation of project status that was used successfully with multiple advanced technology projects within the Indian Guided Missiles Development Programme.
Abstract: Project Management Systems can use a variety of tools to model and visualise project status. This paper discusses the application of an integrated approach for project modeling and proposes a new graphic tool called PACT for evaluation of project status. An integrated performance monitoring system comprising many tools, including PACT, was used successfully with multiple advanced technology projects within the Indian Guided Missiles Development Programme. The approach provided a better insight into the status and problems of projects, and enabled management to initiate the most appropriate actions towards better performance.

17 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20224
202117
202017
201923
201840
201735