Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Control theory & CMOS. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

Computational Study of Fluid Flow Behavior Over Bio-Inspired Corrugated Airfoil for Micro Aerial Vehicles

Abstract: Comprehensive computational fluid dynamic study of bio-inspired corrugated airfoil is performed at low Reynolds number typical of gliding flight of micro aerial vehicles Two-dimensional computational models of corrugated airfoil and flat plate of same chord length are generated using ANSYS modeling tools The models are meshed using ICEMCFD with rectangular block meshing Numerical simulations are performed at Reynolds number of 35x104 and angles of attack ranging from -40 to 120 K-e turbulence model is used to implement the turbulent condition in flow domain The boundary conditions and size of flow domain are taken as per the available experimental data to facilitate future experimental verification The flow parameters such as velocity and pressure of the corrugated airfoil are obtained computationally and compared with baseline flat plate of same chord length and plate thickness The flow parameters such as velocity and pressure obtained over the corrugated and flat plate profiles indicate that the corrugated wing outperforms the flat plate aerodynamically Flow conditions such as formation of leading edge vortex in the first valley of corrugated airfoil and formation of trailing edge vortices at higher angles of attack compared to the flat plate The corrugated profile produced lower drag, higher lift and hence better aerodynamic efficiency than flat plate

Computational Modeling and Analysis of Intake Taper Manifold of an Internal Combustion Engine

Abstract: The intake manifold is a key part of an i.c engine to feed the input air. It maybe a casting or fabricated of relatively light material. The air passes through the passage and enters into cylinder, due to bent cross-section the velocity of intake air is optimum. In order to improve the velocity of air entering in to cylinder chamber, it is proposed that the helical intake manifold with different pitches and taper at exit in the place of existing manifold, due to this the swirl motion generated in the intake helical manifold leads to increase the velocity of air which is entering into cylinder such that it may help to increase the combustion efficiency of the engine.

Performance Analysis of Bi-Orthogonality Based Systems for 5G Internet of Machine Critical Things Communications

Abstract: The vast set of connections among devices via the Internet is well-known as the Internet of Things (IoT). The mandate for 5G cellular communication is to support the IoT and Internet of Machine Critical Things (IoMCT) communications along with traditional voice, video and data communications. The IoMCT plays a crucial role in machine critical tasks such as battlefields, disaster management, and infrastructure surveillance. IoMCT applications demands ultra low cost and low power solutions. In order to cater the needs of IoMCT services, innovative physical layer solutions are need to be developed based on the existing Long Term Evolution (LTE) 4G cellular systems. One such solution is to design a new waveform for the 5G cellular communication systems which can handle a diversified requirements and varied traffic types. In this paper, a new access method within the ambit of 3GPP defined LTE procedures is discussed to support IoMCT generated sporadic traffic. The main problem to be addressed is handling of simultaneous transmission of data and control traffic. A new waveform based on bi-orthogonal frequency division multiplexing with Offset Quadrature Amplitude Modulation (OQAM) is proposed in this paper. BFDM system with QAM and OQAM are simulated using Matlab Software and the simulation results shows that the proposed the OQAM based BFDM waveform approach is better compared to the conventional random access using OFDM under various real time fading conditions defined by 3GPP for LTE.