Faculty Publications
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Publications by NITK Faculty
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Item PC based wireless wind data analyser(2008) Badami, R.L.; Ashok, S.; Jangamshetti, S.H.This paper presents the development and implementation of a wireless wind data analyser. The proposed analyser employs the Global System for Mobile technology to read and transmit the wind data to a PC located at the work place. The output of anemometer is processed by microcontroller and transmitted to a personal computer via dedicated transmitter-receiver mobiles. The receiver mobile is interfaced to a personal computer, where the received wind data is analyzed to assess the wind potential, annual energy yield and siting. Two cup type anemometers, set up at different heights, are used for testing the proposed wind monitoring system. The output is compared with the wind data recorded using NRG wind data logger. The results are accurate. The proposed data logger can be effectively used for recording wind data from remote places. © 2008 IEEE.Item Buckling Behavior of Non-Uniformly Heated Tapered Laminated Composite Plates with Ply Drop-Off(World Scientific Publishing Co. Pte Ltd wspc@wspc.com.sg, 2018) Ashok, S.; Jeyaraj, P.The thermal buckling characteristics of non-uniformly heated tapered laminated composites plates with ply drop-off have been investigated numerically. Detailed parametric studies have been carried out for the effects of taper configuration, temperature variation, aspect ratio and structural boundary conditions on critical buckling temperatures and buckling mode shapes. It is found that the nature of taper as well as the applied temperature field have considerable effects on the critical buckling temperatures of laminated composite tapered plates. Square plates buckle at the highest temperature when subjected to the decreasing temperature profile. Additionally, it is noted that Taper B and Taper C plates show the best behavior under buckling for most structural boundary conditions. Moreover, the change in buckling mode shapes with respect to temperature profile and taper configuration is significant for rectangular plates in comparison with square plates. © 2018 World Scientific Publishing Company.Item Static deflection and thermal stress analysis of non-uniformly heated tapered composite laminate plates with ply drop-off(Elsevier Ltd, 2018) Ashok, S.; Jeyaraj, P.The effective design of tapered laminated composite structures subject to non-uniform temperature fields requires a thorough understanding of their static behaviour. In this study, a finite element analysis of tapered laminated composite plates with ply drop-off has been carried out to study the static deflection and normal stress patterns developed under non-uniform heating. The study revealed that the nature of the taper configuration, the nature of the applied temperature field and the structural boundary conditions influence the static deflection behaviour and the normal stresses developed in the tapered composite plates. It is found that the static deflection pattern of a tapered plate subject to a particular temperature profile is not sensitive to the nature of the taper configuration. It is also observed that the static deflection pattern of a tapered plate is significantly influenced by the nature of temperature field. Normal stress variation of tapered plates subject to various temperature fields reflects the nature of the temperature profile. Maximum normal stress occurs at locations where the highest temperature exists for that particular temperature field. The stresses are also influenced by the nature of the taper - Taper D plates experience low stresses while Taper B and Taper C plates experience similar values. It was also found that large variations in stresses are observed at resin pockets. © 2018