Personal Profile

Ph.D 

 Indian Institute of Technology, Delhi (1986)

M.Tech 

 Indian Institute of Technology, Delhi (1983)

B.Tech. 

 Indian Institute of Technology, Bombay (1980)

Visiting Faculty

Dept of Mechanical Engg, National Chung-Cheng University, Taiwan

Summer 1996

Dept.Genie Mechanique Developpement, INSA de Lyon, France

Indo US Fellow

Dept of Mechanical Engg

Virginia Tech, Blacksburg, Virginia, USA

Senior Scientific Officer

Department of Mechanical Engineering

Indian Institute of Technology New Delhi

Feb 1986 - Dec 1987

Project Specialist

TATA 500 MW Expansion Project

TATA Thermal Power Station, Bombay

Jan 1981 - July 1981

Apprentice Engineer

Godrej & Boyce Manufacturing Company Pvt Ltd, Bombay

July 1980 - Jan 1981

New Courses Developed 

•  Dynamics of Rotating Machinery

• Railroad Vehicle Dynamics

• Sensors and Instrumentation for Interactive Environments

• Mechatronics

• Measurement & Control through Virtual Instrumentation

• Fabrionics 

Other Courses

• Dynamics & Control of Machinery

• Fluid Mechanics & Rate Processes

• Programming & Numerical Analysis

• Design of Mechanical Systems

• Mechanics of Solids

• Engineering Graphics 

Research Interests

• Machine Dynamics

• System Identification and Parameter Estimation

• MEMS

• Instrumentation and Sensor Technologies

• Condition Monitoring & Neural Networks 

Thesis Supervision

• Ph.D. Thesis Titles

• M.Tech. Thesis Titles

Research Details

Turbomachine Blading and Rotor Analysis

Extensive analysis of turbine blades and rotors including:

• free vibrations

• experimental damping estimation,

• forced vibration analysis under steady and transient operating regimes and

• life estimation coupled with laboratory testing and measurements.

Software in use at BHEL, Hyderabad and Tai Power Company, Taipei.

Nonlinear System Identification

• Based on Volterra and Weiner Theories, which form the basis of higher order FRF Analysis for Nonlinear Systems.

• Wavelet based methods for transient response analysis and application to coast-up and coast-down signatures.

• Kernel Identification for various types of nonlinearities.

• Systems with single and multiple degrees of freedom with direct and cross-coupling terms are analysed.

Estimation of System Parameters

• Stochastic Vibration Analysis employing Fokker-Planck-Kolmogrov theories, which provide analytical solutions for nonlinear response in terms of probabilty statistics.

• Higher Order Kernel Processing of nonlinear system response under random excitation.

• Multi-tone Harmonic Probing techniques with Volterra and Wiener Theories.

Modal Analysis and Testing

• Analysis of external (stabilising) and internal (destabilising) damping in rotors.

• Spatial Modal Analysis of beams.

Time Series Applications

• ARMA models for response prediction in mechanical systems.

Condition Monitoring

• Neural Network Algorithms developed for Condition Monitoring applications in rotating machinery, including steam and gas turbine engines. Algorithms are based Backpropagation, Radial Basis Functions and Self Organising Maps.

• Bifurcations and chaos in rotors due to multiple faults.

Vehicle Dynamics

• Dynamic Stabilty analysis and study of phenomenon like roll-over and lateral sliding of automobiles.

• Control Algorithms for Limited Slip Differentials.

• Wheel-rail interaction dynamics for rail vehicles.

1. Convergence Analysis of Volterra Series response of Nonlinear Systems subjected to Harmonic Excitation, Journal of Sound and Vibration, Vol. 236(2), pp. 339-358, 2000. 

Animesh Chatterjee and N. S. Vyas

2. Stiffness Nonlinearity Classification through Structured Response Component Analysis using Volterra Series, Mechanical Systems and Signal Processing, Vol. 15(2), pp. 323-336, 2001. 

Animesh Chatterjee and N. S. Vyas

3. Nonlinear Parameter Estimation with Volterra Series using Method of Recursive Iteration through Harmonic Probing, Journal of Sound and Vibration, Vol. 268(4), pp. 657-678, 2003. 

Animesh Chatterjee and N. S. Vyas

4. Nonlinear parameter Estimation in Rotor bearing System using Volterra Series and Method of Harmonic Probing, ASME Journal of Vibration and Acoustics, Vol. 125 (3), pp. 299-306, , 2003. 

Animesh Chatterjee and N. S. Vyas

5. Nonlinear Parameter Estimation in Multi-Degree-of-Freedom Systems using Multi-Input Volterra Series”, Mechanical Systems and Signal Processing, Vol.18(3), pp. 457-489, 2004. 

Animesh Chatterjee and N. S. Vyas

6. Parametric and Nonparametric Identification of Nonlinear Systems: A Survey, Advances in Vibration Engineering, Vol. 1(4), pp. 356-377, 2003. 

Animesh Chatterjee and N. S. Vyas

7. Nonlinear Bearing Stiffness Parameter Estimation in Flexible Rotor-Bearing Systems using Volterra and Wiener Approach, Probabilistic Engineering Mehanics, 2001, Vol.6 (2), pp. 137-157. 

A. A. Khan, N. S. Vyas

8. Application of Volterra and Wiener theories for Nonlinear Parameter Estimation in a Rotor-Bearing System, Nonlinear Dynamics, Vol. 24 No. 3 March 2001, pp.285-304. 

A. A. Khan, N. S. Vyas

9. Reconstruction of turbine blade forces from response data, Mechanism and Machine Theory, 2000, Vol 36(2), pp. 157-175. 

N. S. Vyas, A. L. Wicks

10. Artificial Neural Network Design for Fault Identification in a Rotor-Bearing System, Mechanism and Machine Theory, 2000, Vol 36(2), pp. 177-188. 

N. S. Vyas, D. Satishkumar

11. Convergence Analysis of Volterra Series Response of Nonlinear Systems subjected to Harmonic Excitation, Journal of Sound and Vibration, 2000, Vol.236, No.2, pp. 339-358. 

Animesh Chatterjee, N. S. Vyas

12. Nonlinear Parameter Estimation using Volterra and Wiener Theories, Journal of Sound and Vibration, 221(5), 1999, pp.805-821. 

A. A. Khan, N. S. Vyas

13. Stiffness estimation from random response in multi-mass rotor bearing systems, Probabilistic Engineering Mechanics, Vol.13, No.4, 1998, pp.255-268. 

R. Tiwari, N. S. Vyas

14. Parameter estimation in Imbalanced nonlinear rotor bearing systems from random response, Journal of Sound and Vibration, 208(1), 1997, p. 1-14. 

R.Tiwari, N. S. Vyas

15. Nonlinear bearing stiffness parameter extraction from random response in flexible rotor bearing systems, Journal of Sound and Vibration, 203(3), 1997, p.389-408. 

R. Tiwari, N. S. Vyas

16. Estimation of nonlinear stiffness parametersof rolling element bearings from random response of rotor bearing systems, Journal of Sound and Vibration, Vol.187, No.2, p.229, 1995. 

R. Tiwari, N. S. Vyas

17. Dynamic stress analysis and a fracture mechanics approach to life prediction of turbine blades, Mechanism and Machine Theory, Vol 32, No.4, 1997, pp.511-527. 

N. S. Vyas, Sidharth, J. S. Rao

18. Determination of blade stresses under constant speed and transient conditions with nonlinear damping, Journal of Engg. for Gas Turbines And Power, Trans.ASME, 1996, vol.118, No.2, pp 424-433. 

J. S. Rao, N. S. Vyas

19. Fatigue life estimation procedure for a turbine blade under transient loads, Journal of Engineering for Gas Turbines And Power, Trans. ASME, v. 116, 1994, p.198. 

N. S. Vyas

20. Equations of motion of a blade rotating with variable angular velocity, Journal of Sound and Vibration, 156(2), 1992, p.327-336. 

N. S. Vyas, J. S. Rao

21. Shock in rotor blades during speed changes, Journal of Sound and Vibration, 176(4), 1994, p.531. 

N. S. Vyas, J. S. Rao

22. Blade damping measurements in a spin rig with nozzle excitation simulated by electromagnets, Shock And Vibration Bulletin, No.56, Pt.2, 1986, p.109. 

J. S. Rao, K. Gupta, N. S. Vyas

23. Application of Reissner method to a tapered, twisted, aerofoil cross section turbine blade mounted at a stagger on a rotating disc, Defence Science Journal, V.36, No.3,1986, p.273. 

J. S. Rao, N. S. Vyas

24. Pseudo Static excitation of turbine blades under acceleration, ASME Design Engineering Technical Conference, 1995, Vol. 3 - Part B, p.1193-1200. 

N. S. Vyas

25. A fracture mechanics approach to life prediction of turbine blades, ASME 93-GT-406. 

N. S. Vyas, Sidharth

26. Transient stress response of a turbine blade under nonlinear damping effects, ASME 90-GT-269. 

J. S. Rao, N. S. Vyas

27. Resonant stress calculation of a turbine blade with damping as a function of rotor speed and vibration amplitude, ASME 89-GT-27.

J. S. Rao, N. S. Vyas

28. On life estimation of turbine blading, Proc. IFToMM Technical Comm. on Rotordynamics, Seventh IFToMM World Congress, 1987. 

J. S. Rao, N. S. Vyas

29. Transient response of turbine blade, Proc.7thIFToMM World Cong,1987, p.289. 

N. S. Vyas, K. Gupta, J. S. Rao

30. Analytical and experimental investigations on vibratory stresses of a turbine blade under NPF excitation, Proc.IFToMM Intl. Conf. Rotordynamics, 1986, p.289. 

J. S. Rao, K. Gupta, N. S. Vyas

31. Response of steam turbine blades subjected to distributed harmonic nozzle excitation, Proc. 3rd Intl. Modal Analysis Conference, 1984, p.618. 

J. S. Rao, N. S. Vyas

32. Fault Identification in Rotating Machinery Using Neural Networks, Advances in Vibration Engineering, Vol.1, No.1, 2002, pp. 90-99. 

N. S. Vyas, N. Jain, S. Pandey

33. Nonlinear System Identification And Volterra Wiener Theories, Proc. VETOMAC-I, First International Conference on Vibration Engineering And Technology of Machinery, Bangalore, 2000, Invited Paper, IP09. 

N. S. Vyas, Animesh Chatterjee

34. Higher Order FRF and Parameter Estimation in Nonlinear Systems through Volterra and Wiener Theories, Proc. IMAC-XVIII International Modal Analysis Conference, 2000, Texas, paper no.307. 

N. S. Vyas, A. A. Khan

35. Nonlinear Parameter Estimation Using Volterra Series With Multi-Tone Excitation, Proc. IMAC-XX International Modal Analysis Conference, Los Angeles, 2002, pp 880-885. 

Animesh Chatterjee, N. S. Vyas

36. Fault Identification in Rotor Bearing Systems through Back-Propagation and Probabilistic Neural Networks, Proc. IMAC-XX International Modal Analysis Conference, Los Angeles, 2002, pp 271-277. 

N. S. Vyas, D. K. Padhy

37. Surface Classification using ANN and Complex valued Neural Network, Proc. ICONIP 2002, Singapore, pp. 581-586. 

A. Prashant, P. K. Kalra, N. S. Vyas

38. Classifying Words using Complex-Variable Based Neural Networks, Proc. FSKD’02, 1st International Conference on Fuzzy Systems and Knowledge Discovery, 2002, Singapore, p. 581-585. 

Prashanath, PremKalra and Nalinaksh Vyas

39. Development of a cutting tool condition monitoring system for high speed turning operations by vibration and strain analysis, International Journal of Advanced Manufacturing Technology, Vol 37, (2008), 471-485. 

H. Chelladurai, V. K. Jain and N. S. Vyas

40. ANN based cutting tool condition monitoring system for high speed turning operations, International Journal of Machining and Machinability of Materials (Accepted for publication).

H. Chelladurai, V. K. Jain and N. S. Vyas

41. Cutting tool condition monitoring system for high speed turning operations, International Journal of Manufacturing Technology and Management, Vol 21 (2010), 99-111.

H. Chelladurai, V. K. Jain and N. S. Vyas

42. Nonlinear damping parameter estimation of van der Pol system using wavelet transform, Journal of Sound & Vibration. 

R. K. Porwal, N. S. Vyas

43. "Damped quadratic and mixed-parity oscillator response using Krylov-Bogoliubov method and energy balance", Journal of Sound and Vibration, 309 (2007), 877-886. 

R. Porwal, N. S. Vyas

44. "Errors in Nonlinear System Parameter Estimation Using Wavelet Transform" IMAC- XXVI, Orlando, Florida, USA, February 2008. 

R. Porwal, N. S. Vyas

45. "Nonlinear Damping Estimation of Self-Excited System Using Wavelet Transform" IMAC- XXVII, , Orlando, Florida, USA, February 2009. 

R. Porwal , N. S. Vyas

46. "Stiffness nonlinearity classification using Morlet wavelet" Dynamical Systems: Discontinuous, Stochasticity and time delay, Chapter 23, A.C.J. Luo (ed.), Springer Science, 2010. 

R. Porwal , N. S. Vyas

47. A virtual environment in health care domain for management of clubfoot deformity in newborn babies: a case study, International Journal of Healthcare Technology & Management. 

M. L. Jain, S. G. Dhande, N. S. Vyas

48. Modeling Rail Wheel-Flat Dynamics, I World Congress on Engineering Asset Management, WCEAM 2006, Brisbane, Australia, 2006. 

N. S. Vyas & Arvind Kumar Gupta

49. Design and Performance of Neural Network Schemes for Diagnosis of Rotating Machinery Faults, Proc. II World Congress on Engineering Asset Management WCEAM 2007, Yorkshire, UK, 2007. 

N. S. Vyas

50. Parametric study of suspension Elements for Ride index analysis of an Indian Railway freight Vehicle, International Journal of Vehicle Structures and Systems, Vol. 1(4), pp. 70-77, 2009. 

S. Shukla, R. Gupta, and N. S. Vyas

51. Non-Parameteric Identification of Rotor-Bearing System through Volterra-Wiener Theories, Proc., IUTAM Symposium on Emerging Trends in Rotor Dynamics, pp. 309-320, New Delhi, 2009. 

N. S. Vyas and Animesh Chatterjee

52. Weight Reduction in an Indian Railway CASNUB Bogie Bolster Considering Fatigue Strength, International Journal of Vehicle Structures and Systems, Vol. 2(3), pp. 102-109, 2010. 

S. Shukla, R. Gupta, and N. S. Vyas

53. Design Improvements in an Indian Railway Three Piece Freight Bogie Frame Considering Fatigue Strength, 8th International Conference on Railway Bogies and Running Gears (BOGIE’10) Budapest, Hungary, September 13-16, 2010. 

S. Shukla, R. Gupta, and N. S. Vyas

54. Virtual modeling of an ankle foot orthosis for correction of foot abnormality, Robotics and Computer-Integrated Manufacturing 27 (2011) 257-260, 2011. 

Manak Lal Jain, Sanjay Govind Dhande, Nalinaksh S. Vyas

55. ‘Technology Development for Application in Indian Railways’, 5th World Congress on Engineering Asset Management WCEAM & AGIC 2010, Brisbane, Australia, 25-27 October 2010. 

N. S. Vyas and T. V. K. Gupta

56. ‘Feature Extraction based on Image Moments of Wavelet Transforms for Fault Diagnosis in Rotating Machinery’, Proc. 24th International Congress on Condition Monitoring and Diagnostics Engineering Management (COMADEM), page 995-1010, Styavanger, Norway, May 30 – June 01, 2011. 

A. Saxena and N. S. Vyas

57. ‘Life Estimation in Turbomachinery Blading’ Plenary Keynote Paper, Eighth International Conference on Condition Monitoring and Machinery Failure Prevention Technologies CM2011 / MFPT2011, Cardiff, UK, May 20 – 22, 2011. 

N. S. Vyas

58. ‘Structural Fault Detection Using Volterra Series and Multi-Tone Harmonic Probing’,Nineth International Conference on Condition Monitoring and Machinery Failure Prevention Technologies CM2012 / MFPT2012, London, UK, June11 - 13, 2012. 

Nalinaksh S. Vyas and Sharad Dwivedi

59. ‘Modelling for Ride Index and Derailment Criterion Calculation of Railway Passenger Coach under Track Irregularity Excitation’, Proc. 24th International Congress on Condition Monitoring and Diagnostics Engineering Management (COMADEM), Huddersfield, UK, June 18 – 20, 2012. 

Nalinaksh S. Vyas and Manoj Nayani

60. ‘Dynamic Analysis of Multi-body Vehicle fitted with controlled limited-Slip differential using MSC.ADAMS/Car’, International Congress of Theoretical and Applied Mechanics (ICTAM) 2012, Beijing, Aug.19-24, 2012. 

Mohit Goel, Nalinaksh S. Vyas

61. ‘Rollover and Lateral Sliding Stability of Three Wheeled Vehicles’, International Congress of Theoretical and Applied Mechanics (ICTAM) 2012, Beijing, Aug.19-24, 2012. 

Tukesh Soni, Nalinaksh S. Vyas

• Parameter estimation in nonlinear rotor-bearing systems from random response. 

Rajiv Tiwari, 1996

• Parameter estimation in nonlinear rotor-bearing through Volterra and Wiener Theories. 

A A Khan, 1999

• Nonlinear Parameter Estimation using Volterra Series. 

A Chatterjee, 2001

• Investigations on Complex Variable Backpropagation Algorithm & Applications. 

A Prashanth, 2003

• Tool wear monitoring using an articial neural network. 

H Chelladurai, 2007

• Development of an RP Based Ankle Foot Orthosis (AFO) for non-surgical correction of Club-Foot deformity in new born babies. 

M L Jain, 2005

• Nonlinear System Identification using Wavelet Transforms. 

R K Porwal, 2010

• Dynamic Analysis of an Indian Railway Freight Vehicle. 

Sanjay Shukla, 2011

• Mechanics and characterization of water-jet pocket machining. 

TVK Gupta, ongoing

• MEMS based integrated automotive engine health monitoring. 

P. Dalawai, ongoing

• Analytical and experimental investigations on rotating bladed-disk assemblies

D K Tripathi, 1989

• Dynamic stress distribution in the root region of a turbine blade

J P Srivastav, 1989

• A comparative study of stress fields of blade disc attachment configurations of a turbine blade

P Chaudhary, 1990

• Condition monitoring of geared systems

J Gopal, 1990

• On sub-critical phenomenon of rotating shafts due to gravity effects a continuous systems approach

R Tiwari, 1991

• Development of an experimental technique to distinguish between internal and external contributions to damping in rotors

P. Panigrahi, 1992

• Stress analysis and life prediction of turbine blades

Sidharth, 1992

• Condition monitoring of rolling element bearings in a geared rotor

R Kaushik, 1993

• Knowledge based system for diagnosis of rotating machinery

V Nema, 1993

• Time domain analysis for parameter identification of cracked cantilever beams

V K Chauhan, 1993

• Dynamic analysis and life estimation of rotors

V Kumar, 1993

• Turbine blade vibration under variable speed operation

V Selvam, 1996

• Virtual instrumentation for time series analysis

Manoj Kumar, 1997

• Artificial Neural Networks for fault identification in rotors

D Satish, 1997

• Virtual instrumentation for time series analysis of rotors

R Magdul, 1997

• Spatial modal analysis of beams

A Vaze, 1998

• Virtual Instrumentation based neural network design for condition monitoring applications

S Pathak, 1999

• Succesive modal approximation in beams through spatial data

Y Raikhelkar, 1999

• Numerical & Experimental Investigations on Nonstationary Vibrations of Nonlinear systems

A Ghangurde, 2000

• Crack detection in beams through Multi-tone Harmonic Excitation

S Dwivedi, 2000

• Fault Diagnosis of Rotating Machinery using Neural Networks and Virtual Instrumentation

D Padhy, 2001

• Modeling And Dynamic Analysis of Multi-spool Rotor Systems

Yogesh Kumar, 2001

• Neural Network Applicationas for Rotating Machinery Fault Diagnosis

M V Rao, 2002

• Modeling And Analysis of Rail-Wheel-Flat Interaction Dynamics

Arvind K Gupta, 2002

• Real Time Condition Monitoring of Rotors using Self Organising Maps

Ankur Kumar, 2003

• Model Based Fault Diagnosis in Rotor Systems

N R K Reddy, 2004

• Analysis of Engine Induced Vibrations of Motorcycles

Prashanth Dalwai, 2004

• Vertical Dynamics of Train And Track: Influence of Track Imperfections

Raghvendra Kumar Singh, 2004

• Structural Design and Evaluation of Single Axis MEMS Accelerometers

Mohan Kumar, 2005

• Structural Design and Evaluation of Micromachined Vibratory Rate Gyroscopes

Ravi Kumar, 2005

• Parameter Estimation in Rotor-Bearing Systems through Output Only Measurements and Autoregression

Inti Srinivasa Rao, 2005

• Vibration Analysis of Electro Optical Fire Control System (EOFCS) for Naval Applications

Ajai K Sahani, 2005

• Modeling and Analysis of Rail-Vehicle Dynamics

Manoj Nayani, 2006

• Condition Monitoring of Geared Rotor Systems Using Neural Networks

Major Jasdeep Singh, 2006

• Output Only Model Analysis on Rotor Bearing Systems,

Pradeep Sarkar, 2006

• Nonlinear System Identification Using neural Networks

Nitin Galphat, 2006

• Design of Monolithic Triaxial MEMS Accelerometer

Shailesh Kumar Singh, 2007

• Interactive And Integrated Software Development for Rotating Machinery Fault Diagnosis

Rohit Kumar Bartakke, 2007

• Turbine Blade Dynamics and Life Estimation

Ganapathi U., 2007

• Bifurcations and Chaos in Misaligned Rotors with Bearing Clearances

K.Chennakesava, 2008

• Influence of Terrain Friction on Roll-Over and Lateral stability of a Vehicle

D. Pradeep Kumar, 2008

• Dynamic Analysis of Vehicle with controlled Slip Differential

Mohit Goyal, 2008

• Prediction of Steering System Performance variation due to manufacturing errors

S. Goel, 2009

• Rollover and Lateral Stability of Three-wheeled Vehicles

Tukesh Soni, 2009

• Vibration Diagnosis System for Rotating Machinery using a Multi-Layer Feedforward Network and Self Organising Neural Network

Nikhil Ingole, 2009

• Dynamic Rwsponse and Stability of a Spinning Turbine Blade subjected to Pitching and Yawing Motions

Mahesh Chandra Luintel, 2009

• Design Development, Calibration and Error Correction of MEMS based Inertial Measurement Unit

Shantanu Agarwal, 2009

• Design and Development of Integrated MEMS ‘Accelerometer Only’ Inertial Measurement and Geo-Tagging Unit

Kshitij Deo, 2010

• Attitude Determination and Control System for Nanosatellites

Amrti Sagar, 2010

• Dynamic Response and Stability Analysis of a Tapered Pretwisted Spinning Turbine Blade under Gyroscopic Excitation

Ravindra Singh Bisht, 2010

• Feature Extraction Techniques based on Image Moments and Ridges of Continuous Wavelet Transforms for Fault Diagnosis in Rotating Machinery

Ankit Saxena, 2010

• Analysis of Backlash and Position Error caused by Manufacturing and Assembly Errors in Steering Gearbox

• Arvind Kothari, 2011

• Functional Analysis of Bottom Discharge Mechanism of an Indian Railway Freight Vehicle

Suman Suthari, 2012