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Application of a Lateral Misalignments Detection Mechanism for Roadway Powered Electric Vehicle
Krishna G. Mohan,Pulluri Harish,Merugu Kavitha,Mohan Reddy D.,Anil Kumar T. 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
Wireless power transfer (WPT) is emerging as an eminent means of the electric vehicle charging system. A perfectly aligned transmitter–receiver set of WPT system vintages a quick and autonomous charging of the vehicle. However, practically, misalignment is inevitable, and a minor deviation between the transmitter–receiver makes a diff erential fall in the desired output power. So, the system requires a proper mechanism to detect and correct these misalignments. In this paper, an experimental study on lateral misalignments is performed at diff erent ground clearances. Of the many detection techniques present, a 10bit R-2R ladder based lateral misalignment detection mechanism is proposed, and the signifi cant results are presented. This mechanism is a digital-to-analog converter, which induces multiple combinations of outputs. These outputs signify the precise position of the vehicle in the charging lane. Further, an interactive driver assistance system is suggested to attain the desired output power by instructing the EV driver to proceed for perfect alignment. This system eff ectively communicates the data such as state of alignment, measurement of speed, percentage of state-of-charge, and control over the charging process.
Design of a Robot Head Shaped Microstrip Patch Antennas for Multi-band Applications
P.Venkanna Chowdary,T.Mohan Krishna,A.Tathababu 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.8
In this paper, two different types of robot head shaped patch antennas are proposed and a comparative study is presented. Both the proposed antennas have same dimensions except at the mouth position. These antennas are fed by coaxial feeding technique and are etched on an FR-4 substrate with relative permittivity 4.4. The proposed antennas produce multiple bands resonating at 1.63 GHz, 5 GHz, 6.13 GHz, 6.91 GHz and 9.5 GHz frequencies with excellent return loss characteristics. These frequencies have applications in wireless, satellite, radar and mobile communications.
The Quasi-equilibrium State: A Tale of Certain Soundless Systems
Surajit Sen,Jan M.M. Pfannes,T.R. Krishna Mohan 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.3
We consider a 1D system with purely non-linear interactions such that no acoustic propagation is possible. We show that our system can attain an equilibrium-like state, which we call the \quasiequilibrium" state. The quasi-equilibrium state is found to be independent of the initial conditions with the particle velocities satisfying a Gaussian velocity distribution. However, in the absence of sound propagation in the system, no energy equi-partitioning is achieved. Our system shows huge temperature uctuations. Linear response theory seems inapplicable in describing the propagation of a perturbation in the quasi-equilibrium state.