Qualification: 
M.Tech
k_devarajan@cb.amrita.edu

Devarajan K. currently serves as Assistant Professor at Department of Mechanical Engineering, School of Engineering, Coimbatore Campus. His areas of research include Engineering Mechanics and Solid Mechanics.

EDUCATION

YEAR DEGREE/PROGRAM INSTITUTION
2012 M.Tech in Engineering Design Amrita School of Engineering, Coimbatore
2007 B. E. in Mechanical Engineering Kongu Engineering College, Erode

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2017

Journal Article

K. Devarajan and B. Balaram, “Analytical Approximations for Stick-Slip Amplitudes and Frequency of Duffing Oscillator”, Journal of Computational and Nonlinear Dynamics, vol. 12, no. 4, 2017.[Abstract]


Linear spring mass systems placed on a moving belt have been subjected to numerous investigations. Dynamical characteristics like amplitude and frequency of oscillations and bifurcations have been well studied along with different control mechanisms for this model. But the corresponding nonlinear system has not received comparable attention. This paper presents an analytical investigation of the behavior of a Duffing oscillator placed on a belt moving with constant velocity and excited by dry friction. A negative gradient friction model is considered to account for the initial decrease and the subsequent increase in the frictional forces with increasing relative velocity. Approximate analytical expressions are obtained for the amplitudes and base frequencies of friction-induced stick-slip and pure-slip phases of oscillations. For the pure-slip phase, an expression for the equilibrium point is obtained, and averaging procedure is used to arrive at approximate analytical expressions of the periodic amplitude of oscillations around this fixed-point. For stick-slip oscillations, analytical expressions for amplitude are arrived at by using perturbation analysis for the finite time interval of the stick phase, which is linked to the subsequent slip phase through conditions of continuity and periodicity. These analytical results are validated by numerical studies and are shown to be in good agreement with them. It is shown that the pure-slip oscillation phase and the critical velocity of the belt remain unaffected by the nonlinear term. It is also shown that the amplitude of the stick-slip phase varies inversely with nonlinearity. The effect of different system parameters on the vibration amplitude is also studied. Copyright © 2017 by ASME.

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2016

Journal Article

K. Devarajan, R, R., and K, B., “Free Vibration Behavior of Fiber Metal Laminates, Hybrid Composites, and Functionally Graded Beams using Finite Element Analysis”, International Journal of Acoustics and Vibration, vol. 21, no. 4, pp. 418-428, 2016.

2015

Journal Article

S. Saravanamurugan, Alwarsamy, T., and Devarajan, K., “Optimization of Damped Dynamic Vibration Absorber to Control Chatter in Metal Cutting Process”, Journal of Vibration and Control, vol. 21, no. 5, pp. 949-958, 2015.[Abstract]


This paper deals with finding the optimum parameters of a damped dynamic vibration absorber (DVA) to control chatter in metal cutting systems. The performance of conventional damped DVA is compared with the proposed skyhook damper in which the damper of the absorber system is connected between the absorber mass and an inertial reference in the sky, referred to as a skyhook damper. The damped DVA is optimized by reducing the magnitude in the positive side and increasing it in the negative side of the real part of the frequency response function of the main system. The optimum frequency ratio and the damping ratio of the damped DVA for the undamped and damped main system are obtained using analytical solutions and a numerical optimisation technique, viz genetic algorithm, respectively. The performance of the proposed skyhook damper is marginally better than the conventional type of damped DVA in controlling the vibration of the main system. This is verified by analyzing both the proposed and conventional models using finite element method-based commercial software ANSYS.

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2012

Journal Article

K. Devarajan, Dr. Ajith Ramesh, and K Marimuthu, P., “FEM Analysis of Effect of Rolling Parameters on Cold Rolling Process”, Bonfring International Journal of Industrial Engineering and Management Science, vol. 2, no. 1, 2012.

Publication Type: Conference Proceedings

Year of Publication Publication Type Title

2014

Conference Proceedings

M. Anand, Laxman, V., Devarajan, K., Balaji, R., Shrivathsan, K. S., and Adithiyakkumaran, D. A., “Structural dynamic model for a horizontal axis wind turbine system”, International Conference on Theoretical, Applied, Computational and Experimental Mechanics. IIT Kharagpur, India, 2014.

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