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Ramesh Maganti N.V.,Nalla Malla Reddy Engineering College
International Journal of Computational Methods in Engineering Science and Mechanics | Year: 2015

Functionally graded materials (FGMs) are designed to achieve a functional performance with gradually variable properties in one or more directions. In this article, free chordwise vibrations of functionally graded double-tapered rotating cantilever beams have been investigated. The functionally graded material of the beam is characterized by continuous variables, Young's modulus, and density that vary along the thickness direction according to a power law. The equations of motion are derived using Lagrange's approach, in which the energy expressions for rotating beam are expressed in terms of hybrid deformation variables. The Rayleigh Ritz method is used to obtain the frequencies of the tapered beam. The effect of the gradient in material proportion, taper ratios, hub radius, and rotational speed on Lagrange's approach with the free chordwise bending vibrations of the tapered beam are investigated and compared with the data in the literature. © 2015 Taylor and Francis Group, LLC.

Ramesh M.N.V.,Nalla Malla Reddy Engineering College
International Journal of Mechanics and Materials in Design | Year: 2013

The natural frequencies of vibration of a rotating pre-twisted functionally graded cantilever beam are investigated. Rotating cantilever beam with pre-twist made of a functionally gradient material (FGM) consisting of metal and ceramic is considered for the study. The material properties of the FGM beam symmetrically vary continuously in thickness direction from core at mid section to the outer surfaces according to a power-law form. Equations of motion for free vibration are derived using Lagrange's equation and the natural frequencies are determined using Rayleigh-Ritz method. The effect of parameters such as the pre-twist angle, power law index, hub radius and rotational speed on the natural frequencies of rotating functionally graded pre-twisted cantilever beams are examined through numerical studies and comparison is made with the numerical results obtained using other methods reported in literature. The effect of coupling between chordwise and flapwise bending modes on the natural frequencies has also been investigated. © 2013 Springer Science+Business Media Dordrecht.

Ramesh M.N.V.,Nalla Malla Reddy Engineering College
International Journal of Acoustics and Vibrations | Year: 2014

The increasing needs of the industry involved in development of components for aerospace and power sector demand the engineering community to develop new concepts and strategies to improve the functional requirements of structures and to enhance the strength of materials. This is particularly essential in the cases of rotating beams that are subjected to severe vibration under large pressure loadings, high rotating accelerations, centrifugal forces, geometric stiffening, etc. A theoretical investigation of the free vibration characteristics of rotating cantilever beams, made of a functionally-graded material (FGM) consisting of metal and alumina, is presented in this study. It was assumed that the material properties of the FGM beam were symmetric, but varied continuously in the thickness direction from the core at the mid section to the outer surfaces, according to a power-law relation. Equations of motion were derived from a modelling method, which employed the hybrid deformation variable. The natural frequencies were determined using the Rayleigh-Ritz method. The effect of parameters such as the power law index, the hub radius, and the rotational speed on the natural frequencies of functionally-graded rotating cantilever beams were examined through numerical studies and then compared with the numerical results reported in earlier works.

Sheela Rani C.M.,Nalla Malla Reddy Engineering College
Advances in Intelligent Systems and Computing | Year: 2014

Image fusion is a process in which high-resolution Panchromatic Image (PAN) is combined with a low resolution Multispectral Image (MS) to form a new single image which contains both the spatial information of the PAN image and the spectral information of the MS image. By applying wavelet transform alone, the fusion result is often not good. Hence, when a wavelet transform is integrated with any traditional fusion method the fusion results are better. The decimated and undecimated wavelets used in image fusion can be categorized into three classes: Orthogonal, Biorthogonal, and Nonorthogonal. In this study, a fusion technique is proposed which uses both wavelet and PCA method for fusing the IRS-1D images using LISS III scanner for the locations Vishakhapatnam and Hyderabad, India. The proposed fusion results are compared using statistical performance measures and analyzed. It was ascertained that the wavelet with PCA is superior to the other wavelet transform methods. © Springer India 2014.

Meenakshi G.,Nalla Malla Reddy Engineering College | Manisharma V.,Nalla Malla Reddy Engineering College
Advances in Intelligent Systems and Computing | Year: 2014

Assessment of student performance is one of the important tasks in the teaching and learning process. It has great impact on the student approach to learning and their outcomes. Evaluation of student learning in different activities is the process of determining the level of performance of students in relation to individual activities. A rubric is a systematic scoring guideline to evaluate student performance (assignment, quiz, paper presentation, open and closed book test etc.) through the application of detailed description of performance standards.After giving the specific task the student should be explained about the criteria and evaluation points. This allows the students to be aware of the performance and they will try to improve the performance. In this paper themain focus is on student centered learning activitieswhich aremainly based on multiple intelligences. This paper presents an integrated fuzzy set approach Lotfi et al. [2] to assess the outcomes of student-centered learning. It uses fuzzy set principles to represent the imprecise concepts for subjective judgment and applies a fuzzy set method to determine the assessment criteria and their corresponding weights. © Springer India 2014.

Rajkumar S.,Thiagarajar College of Engineering | Thiruvengadam S.J.,Nalla Malla Reddy Engineering College
Wireless Personal Communications | Year: 2016

In this paper, optimum combining technique is applied to minimize the effect of Narrowband Interference (NBI) in Orthogonal Frequency Division Multiplexing based full duplex relay network. The NBI signal is assumed to be quasi-static over the duration of a transmitted signal. Multiple antennas are employed at Decode and Forward relay and destination nodes. The Probability Density Function of Signal to Interference Ratio at relay and destination nodes is derived using Hotelling’s T2 distribution. Analytical expression for the end-to-end outage probability of the proposed network is derived using the hypergeometric functions. As the weight vector of the optimal combiner is determined using the statistics of the interference channels, the performance of the proposed network becomes better than the network with maximal ratio combining. © 2016 Springer Science+Business Media New York

Jukuntla A.,Nalla Malla Reddy Engineering College | Pendam K.,Nalla Malla Reddy Engineering College | Arjun N.,Nalla Malla Reddy Engineering College
2015 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2015 | Year: 2015

A large class of Wireless Sensor Networks applications involved in monitoring environmental parameters in isolated urban areas covered with sensor nodes. Mobile sinks are mounted upon isolated urban areas with fixed trajectories to monitor environmental parameters. These MS provides ideal infrastructure for retrieving sensory data from isolated WSNfields. The existing approach uses the multi-hop technique for transfer of data from SNs lies within MS's range and network traffic can be balanced among sensor nodes. When sensor nodes run out of energy, the resulting loss of network connectivity and decreasing network life time. In this paper, an ant colony optimization (ACO) scheduling algorithm is exploredfor maximizing the network life, it can be done in three phases. In phase one, finds the initial active sensor nodes with fully coverage constraints. In second phase, it uses successor sensor set, for activating the sensor nodes for reaching constraint. In third phase, sensory data will be forwarded to MS through rendezvous nodes. © 2015 IEEE.

Garimella U.,Nalla Malla Reddy Engineering College | Nalla D.,Nalla Malla Reddy Engineering College
Proceedings - Frontiers in Education Conference, FIE | Year: 2015

The National Accreditation Board in India has recently adopted the Washington Accord Graduate Attributes and has mandated all colleges offering the Bachelor's program in Engineering to prepare accreditation based on Outcome-based Education (OBE). Given that the Indian school education, by and large, is not outcome-based, it is quite challenging to implement OBE at college level. Both the students and faculty do not have a frame of reference for this type of learning. The college whose case study we are presenting does not have autonomy in curriculum and in student admission process. We present in this paper our challenges, particularly in preparing the faculty to teach using OBE, as we believe they are the key elements. We have evolved a system by trying well researched best practices and customizing them to our situational factors. Some components of the system are in a nascent stage. We present the basis of the OBE in section I. The Indian engineering education system is briefly described in section II to prepare the ground for our situational factors in section III. We outline the initiatives at our college and some conclusions from these initiatives later in the paper. © 2014 IEEE.

Kumar M.N.,Indian National Remote Sensing Centre | Garimella U.,Nalla Malla Reddy Engineering College | Nalla D.,Nalla Malla Reddy Engineering College
Proceedings - Frontiers in Education Conference, FIE | Year: 2015

Much research into how people learn and skills required for professional competence has gone into designing curricula in higher education. Benjamin Bloom, Fink, Eric Mazur, Richard Felder and many others have much contributed to the design of aligned courses where outcomes, teaching and assessment complement each other resulting in effective learning. This is the basis of the international accreditation using outcome based education (OBE). Moreover, the Indian accreditation agency National Board of Accreditation (NBA) has adopted outcome based education for colleges seeking accreditation now. In this paper, we specifically describe the work in progress implementation of social constructive approaches such as eBridge and Talent Identification strategies in Nalla Malla Reddy Engineering College (NMREC) which is an affiliated engineering college of Jawaharlal Nehru Technological University (JNTU), Hyderabad, India. These strategies aim at fulfilling all the graduate attributes according to Washington Accord. In the present paper, we propose to show the processes, the data and some outcomes of these initiatives. The measured outcomes have demonstrated the positive influences of social constructivism in skill development and employability of the students. © 2014 IEEE.

Bhushan T.V.S.M.R.,Nalla Malla Reddy Engineering College | Reddy K.V.K.,JNTUH College of Engineering
Acta Technica CSAV (Ceskoslovensk Akademie Ved) | Year: 2015

Experiments have been conducted to investigate natural convection heat transfer from the outer surface of axially inclined square ducts. Steady state heat transfer characteristics are studied at an arbitrary inclination of 45° from vertical in laminar and transition regions in still air, with channel area ratio and orientation as study parameters. Wide range of heat inputs are considered to analyze natural convection under laminar and transition regions under constant heat flux conditions. Empirical correlations are derived for local and average Nusselt and modified Rayleigh numbers. Experimental results were compared with established correlations pertaining to vertical cylinders and enhancement of heat transfer at 45° from vertical orientation were observed. © 2015 Institute of Thermomechanics AS CR, v.v.i.

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