Qualification: 
Ph.D, M.Tech, B-Tech
Email: 
b_santhosh@cb.amrita.edu

Dr. Santhosh B. currently serves as Assistant Professor (SG) at the Department of Mechanical Engineering, School of Engineering, Coimbatore Campus. His areas of research include Linear and Nonlinear Vibrations, System Dynamics and Control and Random Vibrations.

Educational Qualifications

  1. B.Tech in  Mechanical Engineering, College of Engineering  Trivandrum (1996)
  2. M.Tech in Mechanical Engineering,  IIT Madras (2005) Specialization – Machine Dynamics
  3. PhD  in Mechanical Engineering , IIT Madras (2015) Thesis title – Dynamics of Nonlinear Systems with Discontinuous Nonlinearitie

Teaching

  • Theory of Vibrations
  • Dynamics of Machinery
  • Engineering Mechanics
  • Computational Methods in Engineering
  • Modeling and Simulation of Engineering Systems
  • Instrumentation and Control Systems
  • Nonlinear Vibrations

Research Topics

  • Discontinuous dynamical systems
  • Energy harvesting from vibration systems
  • Isolation systems with negative stiffness
  • Higher dimensional Filippov systems
  • Reduced order modeling of systems with friction

Publications

Publication Type: Journal Article

Year of Conference Publication Type Title

2016

Journal Article

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Discontinuity induced bifurcations in nonlinear systems”, Procedia IUTAM, 2016.

2015

Journal Article

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Nonlinear Dynamics of Shrouded Turbine Blade System with Impact and Friction”, Applied Mechanics and Materials, pp. 81-92, 2015.[Abstract]


Dry friction dampers are passive devices used to reduce the resonant vibration amplitudes in turbine bladed systems. In shrouded turbine blade systems, in addition to the stick- slip motion induced by dry friction during the contact state in the tangential direction, the interface also undergoes intermittent separation in the normal direction. The problem can thus be treated as a combination of impact and friction. In this work, the dynamics of dry friction damped oscillators which are representative models of dry friction damped bladed system is investigated. A one dimensional contact model which is capable of modeling the interface under constant and variable normal load is used. The steady state periodic solutions are obtained by multi - harmonic balance method (MHBM). Frequency response plots are generated for different values of normal load using the arc length continuation procedure. The MHBM solutions are validated using numerical integration. A single degree of freedom (dof) model under constant normal load with constant and variable friction coefficients, a dry friction damped two dof system under constant normal load and a two dof system under variable normal load are investigated. In the presence of variable normal load, the system shows multivalued frequency response and jump phenomenon. The optimal value of the normal load which gives minimum resonant response is also obtained.

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2014

Journal Article

Dr. Santhosh B., Padmanabhan, C., and Narayanan, S., “Numeric-analytic solutions of the smooth and discontinuous oscillator”, International Journal of Mechanical Sciences, vol. 84, pp. 102–119, 2014.[Abstract]


Earlier works on the smooth and discontinuous (SD) oscillator concentrated mainly on the time domain analysis using analytical, semi-analytical and numerical integration methods. In this paper, the frequency domain analysis of the SD oscillator subjected to harmonic excitation which is as important and giving further insight into the dynamics is carried out. Multi-Harmonic Balance Method (MHBM) in combination with arc length continuation is used to obtain the periodic solutions and their branches in the frequency domain for different values of the smoothing parameter α and exciting frequency ω . Stability of the periodic motions and bifurcation behavior are analyzed using the Floquet theory. For the discontinuous case, the oscillator is treated as a Filippov system and an event driven numerical integration method is used to obtain the response. For α>1, the dynamics of the SD oscillator is similar to that of the hardening Duffing oscillator, for α=1, it is like that of the Ueda oscillator and for 0<α<1 it is like that of the Duffing oscillator with double well potential. The SD oscillator exhibits period 1 solutions, higher order periodic solutions, chaotic solutions through symmetry breaking bifurcations, period doubling and boundary crises in different parameter ranges. Chaos is observed over a larger frequency range interspersed by narrow windows of higher order periodic solutions

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2013

Journal Article

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Periodic response and bifurcations of a smooth and discontinuous oscillator by harmonic balance method”, ADVANCES IN VIBRATION ENGINEERING, vol. 12, pp. 401–412, 2013.

Publication Type: Conference Paper

Year of Conference Publication Type Title

2016

Conference Paper

Dr. Santhosh B. and .Narayanan, S., “Reduced order models of dry friction damped systems with contact interface model”, in XXIV ICTAM, Montreal, Canada , 2016.

2015

Conference Paper

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Discontinuity induced bifurcations in higher dimension Filippov systems.”, in Int. Conference on Engineering Vibration (ICOEV 2015), Slovenia, 2015.

2015

Conference Paper

Dr. Santhosh B., Narayanan, S., and , “Discontinuity induced bifurcations in Nonlinear Systems.”, in IUTAM Symposium on Analytical Methods in Nonlinear Dynamics, Frankfurt, Germany , 2015.

2015

Conference Paper

Dr. Santhosh B. and Das, S., “Energy Harvesting from Nonlinear Vibration Absorbers”, in Int. Conference on Vibration Problems (ICOVP-2015), IIT Guwahati, India, 2015.

2015

Conference Paper

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Discontinuity induced bifurcation in nonlinear oscillators”, in 12th Int. Conference on Vibration Problems (ICOVP-2015), IIT Guwahati, 2015.

2014

Conference Paper

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Nonlinear Dynamics of a two degree of freedom Oscillator with a Snap Through Mechanism”, in 8thEuropean Nonlinear Dynamics Conference (ENOC 2014), Vienna, Austria, 2014.

2013

Conference Paper

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Nonlinear Dynamics of Shrouded Turbine Blade System with Impact and Friction”, in 11th Int. Conference on Vibration Problems (ICOVP-2013, Lisbon, Portugal , 2013.

2012

Conference Paper

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Dynamics of Oscillators with Continuous and Discontinuous Nonlinearities by Harmonic Balance and Path following”, in XXIII Int .Congress of Theoretical and Applied Mechanics , Beijing, China, 2012.

Publication Type: Conference Proceedings

Year of Conference Publication Type Title

2011

Conference Proceedings

Dr. Santhosh B., Narayanan, S., and Padmanabhan, C., “Periodic Response and Bifurcations of a Smooth and Discontinuous Oscillator by Harmonic Balance Method”, International conference on Vibration Engineering and Technology of Machinery (VETOMAC VII). Shanghai, China, 2011.

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