Publications

Refereed Publications
  1. S. Gigi and A. K. Tangirala (2010). Quantitative analysis of directional strengths in jointly stationary linear multivariate processes. Biological Cybernetics. DOI 10.1007/s00422-010-0386-6.
  2. S. Selvanathan and A.K. Tangirala (2010). Diagnosis of poor control loop performance due to model-plant mismatch. Industrial Engineering & Chemistry Research. DOI: 10.1021/ie900769v
  3. S. Selvanathan and A.K. Tangirala (2010). Time-delay estimation in multivariate systems using Hilbert transform relations and partial coherence functions. Chemical Engineering Sciences, 65(2), 660-674
  4. S. Babji and A.K. Tangirala (2010). Source separation in multivariate interacting systems. Digital Signal Processing, 20, 417-432. 
  5. J. Maddala, S. Babji and A.K. Tangirala (2009). Self-Organized Maps for detection of faults in non-linear processes. Special Issue of the International Journal of Automation and Control. In Press.
  6. S. Selvanathan and A.K. Tangirala (2009). Detection and diagnosis of oscillations due to multiple sources in closed-loop systems using wavelet transforms. ICFAI University Journal of Chemical Engineering. 1(1), 7-21.
  7. S. Babji and A.K. Tangirala (2009). Delay estimation in closed-loop systems using average mutual information theory. Control and Intelligent Systems. 37(3).
  8. S. Babji, P. Gorai and A.K. Tangirala (2009). Detection and quantification of control-valve non-linearities using Hilbert Huang Transform. Advances in Adaptive Analysis, 1(3), 425-446. 
  9. G. Vasu and A.K. Tangirala (2009). Control of air flow rate with stack voltage measurement for a PEM fuel cell system. Journal of Energy Storage and Conversion. 1(1), 51-59. 
  10. G. Vasu, A.K. Tangirala, B. Viswanathan and S. Dhathathreyan (2008). Continuous bubble humidification and control of relative humidity of H_{2} for a PEMFC system. International Journal of Hydrogen Energy. 33(17), 4640-4648 
  11. G. Vasu and A.K. Tangirala (2008). Control orientated thermal model for proton-exchange membrane fuel cell systems. Journal of Power Sources, 183, 98-108. 
  12. S. Sivaramakrishnan, A.K. Tangirala and M. Chidambaram (2008). Sliding mode controller for unstable systems. Chemical & Biochemical Engineering Quarterly, 22(1), 41-47. 
  13. J. Ramarathnam and A.K. Tangirala (2008). On the Use of Poisson Wavelet Transforms in System Identification. Journal of Process Control. 1, 48-57. 
  14. S. Selvanathan and A.K. Tangirala (2007). Time delay estimation in closed-loop SISO systems using Hilbert Transform relations. Special Issue of the International Journal of Chemical Sciences, 5, 1821-1829. 
  15. A.K. Tangirala, J. Kanodia and S.L. Shah (2007). Applications of Non-Negative Matrix Factorization to Plant-Wide Oscillation Detection & Diagnosis. Industrial & Engineering Chemistry Research, 46(3), 801 817 
  16. H. Liu, W. Jiang, A.K. Tangirala, S.L. Shah (2007). An Adaptive Regression Adjusted Monitoring and Fault Isolation Scheme. Journal of Chemometrics, 20(6-7), 280-293. 
  17. H. Raghavan, A.K. Tangirala and S.L. Shah (2006). Identification of chemical processes with irregular output sampling. Control Engineering Practice, 14(5), 467-480. 
  18. A.K. Tangirala, S.L. Shah and N.F. Thornhill (2005). PSCMAP: A new tool for plant-wide oscillation detection. Journal of Process Control, v. 15(8), 931-941. 
  19. A.K. Tangirala, R.S. Patwardhan, S.L. Shah, and T. Chen (2001). LQR performance comparison of multirate vs. single-rate systems. Dynamics of Continuous, Discrete and Impulsive Systems, Series B: Applications and Algorithms, 8, 517-537. 
  20. A.K. Tangirala, D. Li, R. S. Patwardhan, S. L. Shah and T. Chen (2001). Ripple-free conditions for lifted multirate control systems. Automatica, 37(10), October, 1637-1645.  
Refereed Conference Proceedings
  1. A. Gupta and A.K. Tangirala (2011). On-line fault detection in non-linear systems using self-organized maps. Presented at IASTED conference CA 2011, Vancouver, June 1-3, 2011.
  2. S. Mukhopadhyay, U. Mahapatra, A.K. Tangirala and A.P. Tiwari (2010). Spline wavelets for system identification. Presented at DYCOPS 2010, Belgium, July 2-4.
  3. S. Gigi and A.K. Tangirala (2010). Frequency-domain quantification of interactions in MIMO systems using directed variance decompositon. Presented at PSE Asia Conference, Singapore. 
  4. S. Gigi and A.K. Tangirala (2009). Quantification of directed influences in multivariate systems by time-series modelling. International Conference on Control, Automation, Communication and Energy Conversion. INCACEC 2009, Kongu Engineering College, Erode, Tamilnadu, India. 
  5. A.K. Tangirala and S. Babji (2008). Issues in spectral source separation techniques for plant-wide oscilation detection and diagnosis. ICSIP 2008. Proceedings of World Academy of Science, Engineering and Technology, Heidelberg, Germany, v. 33, September, 160-165. 
  6. G. Vasu, D. Deepak, S. Babji and A.K. Tangirala (2008). Detection and diagnosis of faults in PEM fuel cells. SSPCCIN 2008, 3-5 January, Pune, India.
  7. S. Babji and A.K. Tangirala (2007). Detection of non-linearities in control loops using Hilbert Huang Transformation. NCFCE 2007, IIT Guwahati, India.
  8. J. Kanodia, A.K. Tangirala and S.L. Shah (2007). On the determination of the order of basis space in NMF. Presented at the Fourteenth International Conference CMASM 2007, IIT Madras, Chennai, India. 
  9. A. Bisen and A.K. Tangirala (2007). Diagnosis of plant-wide oscillations in IMC-based schemes due to model-plant mismatch. Presented at the 5^{th} International conference on Trends in Instrumentation, Measurements and Analysis, Tiruchirappalli, India.
  10. M. Rossi, A.K. Tangirala, S.L. Shah and C. Scali (2006). A data-based measure for interactions in multivariate systems. ADCHEM 2006, International Symposium on Advanced Control of Chemical Processes, Gramado, Brazil, April 2-5, pp. 681-686.
  11. A.K. Tangirala, D. Li, R. S. Patwardhan, S. L. Shah and T. Chen (1999). Some issues in multirate process control. In: ACC Proceedings. San Diego, CA, USA. 2771 - 2775. 
  12. H. Zhang, A.K. Tangirala and S.L. Shah (1999). Dynamic Process Monitoring Using Multiscale PCA. In: Canadian Conference on Electrical and Computer Engineering, Vol. 3, 1579 - 1584.
  13. H, Raghavan, A.K. Tangirala and S.L. Shah (2005). Identification of state-space models for processes with irregularly sampled outputs. In Proceedings of IFAC World Congress, Czech Republic.
  14. A.K. Tangirala and S.L. Shah (2005). Detection of plant-wide oscillations using non-negative matrix factorization. In: Proceedings of NCCDS'05, IIT Bombay, Mumbai, India. 

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