Professor

Nickolas Vlahopoulos

 
 
Engineering for the Marine Environment
faculty & staffNA&ME Home
 

Articles in Refereed Journals, Transactions or Archives

  1. S.B. Hong, N. Vlahopoulos, “A hybrid finite element formulation for computing structure – borne vibration in a body in white,” SAE Paper 2006-01-1224, SAE 2006 Transactions Journal of Passenger Cars – Mechanical Systems.
  2. J. Sun, N. Vlahopoulos, T. J. Stabryla, R. Goetz, R. Van De Velde, “Simulations under uncertainty for occupant safety for a vehicle subjected to a blast load,” SAE Paper 2006-01-0762, SAE 2006 Transactions Journal of Materials and Manufacturing.
  3. S.B. Hong, A. Wang, N. Vlahopoulos, “A Hybrid Finite Element Formulation for a beam plate system,” Journal of Sound and Vibration, Vol. 298, 2006, pp. 233 - 256.
  4. J. Wang, N. Vlahopoulos, Z. P. Mourelatos, O. Ebrat, K. Vaidyanathan, “Probabilistic and Sensitivity Analyses for the Performance Characteristics of the Main Bearings in an Operating Engine due to Variability in Bearing Properties,” International Journal of Vehicle Design, Vol. 40, No. 4, 2006, pp. 265 – 298.
  5. Jin Wang, N. Vlahopoulos, Z. P. Mourelatos, O. Ebrat, K. Vaidyanathan, “Probabilistic Computations for the Main Bearings of an Operating Engine due to Variability in Bearing Properties,” accepted by 2004 SAE Transactions Journal of Materials and Manufacturing, SAE paper number 2004-01-1143.
  6. Z. P. Mourelatos, N. Vlahopoulos, O. Ebrat, J. Liang, J. Wang, “Probabilistic Main Bearing Performance for an Internal Combustion Engine,” Journal of Tribology, v. 127, n 4, October, 2005, p 784-792.
  7. O. Ebrat, Z. P. Mourelatos, N. Vlahopoulos, K. Vaidyanathan, “Oil Film Characteristics for Journal Bearing Elastohydrodynamic Analysis based on a Finite Difference Formulation,” SAE Paper 2003-01-1669, SAE Journal of Passenger Cars – Mechanical Systems, September 2004.
  8. Jun Dong, K. K. Choi, A. Wang, W. Zhang, and N. Vlahopoulos, “Parametric Design Sensitivity Analysis of High Frequency Structural-Acoustic Problems using Energy Finite Element Method,” International Journal for Numerical Methods in Engineering, v 62, n 1, Jan 7, 2005, p 83-121.
  9. W. Zhang, N. Vlahopoulos, K. Wu, “An Energy Finite Element Formulation for High Frequency Vibration Analysis of Externally Fluid-Loaded Cylindrical Shells with Periodic Circumferential Stiffeners subjected to Axi-Symmetric Excitation” Journal of Sound and Vibration, Vol. 282, April 22 2005, p. 679-700.
  10. W. Zhang, N. Vlahopoulos, K. Wu, A. Wang “High Frequency Vibration Analysis of Stiffened Plates under Heavy Fluid Loading by an Energy Finite Element Analysis Formulation,” Finite Elements in Analysis and Design, v 41, n 11-12, June, 2005, p 1056-1078.
  11. C. Pierre, N. Vlahopoulos, Z. D. Ma, M. P. Castanier. S. Y. Lee, A. Wang, K. K. Choi, N. H. Kim, and J. Dong “Advanced Structure Methodologies for Next-Generation Ground Vehicles, Part 1: Basic Theories,” International Journal of Heavy Vehicle Systems, Vol. 11, Nos. 3/4, pp. 257-281 (invited contribution).
  12. C. Pierre, N. Vlahopoulos, Z. D. Ma, M. P. Castanier. S. Y. Lee, A. Wang, K. K. Choi, N. H. Kim, and J. Dong “Advanced Structure Methodologies for Next-Generation Ground Vehicles, Part 2: Case Study,” International Journal of Heavy Vehicle Systems, Vol. 11, Nos. 3/4, pp. 282-302 (invited contribution).
  13. O. Ebrat, Z. P. Mourelatos, N. Vlahopoulos, K. Vaidyanathan, “Calculation of Journal Bearing Dynamic Characteristics Including Journal Misalignment and bearing Structural Deformation,” STLE Tribology Transactions, Vol. 47, pp. 94-102, 2004.
  14. A. Wang, N. Vlahopoulos, and K. Wu, “Development of an energy boundary element formulation for computation of sound radiation at high frequency,” Journal of Sound and Vibration, Vol. 278, 2004, pp. 413-436.
  15. O. Ebrat, Z. P. Mourelatos, K. Hu, N. Vlahopoulos, K. Vaidyanathan, “An Elastohydrodynamic Coupling of a Rotating Crankshaft and a Flexible Engine Block,” ASME Journal of Tribology, Vol. 126, pp. 233-241, 2004.
  16. X. Zhao, N. Vlahopoulos, “A Basic Hybrid Finite Element Formulation for Mid-Frequency Analysis of Beams Connected at an Arbitrary Angle,” Journal of Sound and Vibration, Vol. 269, No. 6, January 2004, pp. 135-164.
  17. K. Hu, N. Vlahopoulos, and Z. Mourelatos “Rigid and flexible dynamic response of a rotating shaft on flexible supports with clearances,” Journal of Sound and Vibration, Vol. 267, No. 1, 9 October 2003, pp. 1-28.
  18. W. Zhang, A. Wang, N. Vlahopoulos, and K. Wu, “High Frequency Vibration Analysis of Thin Elastic Plates under Heavy Fluid Loading by an Energy Finite Element Method,” Journal of Sound and Vibration, Vol. 263(1), 22 May 2003, pp. 21-46.
  19. N.H. Kim, J. Dong, K. K. Choi, N. Vlahopoulos, Z.D. Ma, M. P. Castanier, C. Pierre, “Design Sensitivity Analysis for a Sequential Structural-Acoustic Problem,” Journal of Sound and Vibration, Vol. 263(3), 5 June 2003, pp. 569-591.
  20. Z. Zhang, N. Vlahopoulos, S. T. Raveendra, “Formulation of a numerical process for acoustic impedance sensitivity analysis based on the indirect boundary element method,” Engineering Analysis with Boundary Elements (invited contribution), Vol. 27, 2003, pp. 671-681.
  21. Z. Zhang, N. Vlahopoulos, T. Allen, and K. Y. Zhang, “Development and validation of a computational process for pass-by noise simulation,” International Journal of Vehicle Design, Vol. 34, No. 1, 2004, pp. 12-34.
  22. M. J. Allen, N. Vlahopoulos, "Numerical Probabilistic Analysis of Structural/Acoustic Systems," Mechanics of Structures and Machines, Vol. 30, No. 3, July 2002, pp. 353-380.
  23. W. Zhang, A. Wang, and N. Vlahopoulos, “An Alternative Energy Finite Element Formulation based on Incoherent Orthogonal Waves and its Validation for Marine Structures,” Finite Elements in Analysis and Design, Vol.38, 2002, pp. 1095-1113.
  24. K. Hu, N. Vlahopoulos, and Z. Mourelatos, “A Finite Element Formulation for Coupling Rigid and Flexible Body Dynamics of Rotating Beams,” Journal of Sound and Vibration, Vol.253, No.3, 2002, pp.603-630.
  25. M. J. Allen, R. Sbragio, and N. Vlahopoulos, “Structural/Acoustic Sensitivity Analysis of a Structure Subjected to Stochastic Excitation,” AIAA Journal, Vol. 39, No. 7, 2001, pp. 1270-1279,
  26. M.J. Allen, N. Vlahopoulos, “Noise Generated from a Flexible and Elastically supported Structure subject to Turbulent Boundary Layer Flow Excitation,” Finite Elements in Analysis and Design, Vol.37/9, August 2001, pp. 687-712.
  27. Z. Zhang, N. Vlahopoulos, S. T. Raveendra, T. Allen, and K. Zhang, “A Computational Acoustic Field Reconstruction Process based on an Indirect Boundary Element Formulation,” Journal of the Acoustical Society of America, Vol. 108, No. 5, November 2000, pp. 2167-2178.
  28. N. Vlahopoulos, X. Zhao, “An Investigation of Power Flow in the Mid-Frequency Range for Systems of Co-Linear Beams Based on a Hybrid Finite Element Formulation,” Journal of Sound and Vibration, Vol. 242(3), 3 May 2001, pp. 445-473.
  29. X. Zhao, N. Vlahopoulos, “Mid-Frequency Vibration Analysis of Systems Containing one Type of Energy based on a Hybrid Finite Element Formulation,” SAE Paper No. 2001-01-1620, SAE Journal of Passenger Car – Mechanical Systems, 2001, Vol. 110, pp. 2119-2134.
  30. W. Zhang, A. Wang, N. Vlahopoulos, “Validation of the EFEA Method through Correlation with Conventional FEA and SEA Results,” SAE Paper No. 2001-01-1618, SAE Journal of Passenger Car – Mechanical Systems, 2001, Vol. 110, pp. 2104-2119.
  31. M. J. Allen, N. Vlahopoulos, “Accounting for Manufacturing Variability in Interior Noise Computations,” SAE Paper No. 2001-01-1527, SAE Journal of Materials and Manufacturing, 2001, Vol. 110, pp. 967-976.
  32. Z. Zhang, N. Vlahopoulos, T. Allen, and K. Zhang, “A Source Reconstruction Process based on an Indirect Variational Boundary Element Formulation,” Journal of Engineering Analysis with Boundary Elements, Vol. 25, 2001, pp. 93-114.
  33. X. Zhao, N. Vlahopoulos, “A Hybrid Finite Element Formulation for Mid-Frequency Analysis of Systems with Excitation Applied on Short Members,” Journal of Sound and Vibration, Vol. 237(2), October 19, 2000, pp. 181-202.
  34. G. A. Borlase, N. Vlahopoulos, “An Energy Finite Element Optimization Process for Reducing High Frequency Vibration in Large Scale Structures,” Journal of Finite Element Analysis and Design, Vol. 36, 2000, pp. 51-67.
  35. S. T. McGee, A. W. Troesch, and N. Vlahopoulos, “Damage Length Predictor for High Speed Craft,” Marine Technology, Vol. 36, No. 4, Fall 1999, pp. 203-210.
  36. J. D. Reeves and N. Vlahopoulos, "Optimized Alignment of a USCG Polar Class Icebreaker Wing Shaft Using a Distributed Bearing Finite Element Model," Marine Technology, Vol. 36, No. 4, Fall 1999, pp. 238-247.
  37. M. J. Allen, and N. Vlahopoulos, “Integration of Finite Element and Boundary Element Methods for Calculating the Radiated Sound from a Randomly Excited Structure,” Computers and Structures, Vol. 77, No. 2, 2000, pp. 155-169.
  38. N. Vlahopoulos, and X. Zhao, “A Basic Development of a Hybrid Finite Element Method for Mid-Frequency Computations of Structural Vibrations,” AIAA Journal, Vol. 37, No. 11, November 1999, pp. 1495-1505.
  39. N. Vlahopoulos, Xi Zhao, and T. Allen, "An Approach for Evaluating Power Transfer Coefficients for Spot-Welded Joints in an Energy Finite Element Formulation," Journal of Sound and Vibration, Vol. 220, No. 1, 1999, pp.135-154.
  40. N. Vlahopoulos, L.O. Garza-Rios, and C. Mollo, "Numerical Implementation, Validation, and Marine Applications of an Energy Finite Element Formulation," Journal of Ship Research, Vol. 43, No. 3, Sept. 1999, pp. 143-156.
  41. N. Vlahopoulos, and Y. Kalish, "Development of an Equivalent Force Method and an Application in Simulating the Radiated Noise from an Operating Diesel Engine," Shock and Vibration Journal, Vol. 6, No. 3, 1999, pp. 113-123.
  42. M. J. Allen, N. Vlahopoulos, “Integration of Finite Element and Boundary Element Methods for Simulating the Noise Radiated from a Flexible Panel Subjected to Boundary Layer Excitation,”  SAE Paper Number 1999-01-1795, SAE Journal of Passenger Car, 1999, Vol 108, pp. 2951-2958.
  43. N. Vlahopoulos, S.T. Raveendra, C. Vallance, and S. Messer, "A Coupling Algorithm for Structural-Acoustic Models with Unequal Discretization and Partially Interfacing Surfaces," Finite Element in Analysis and Design, Vol. 32, 1999, pp. 257-277.
  44. N. Vlahopoulos, C. Vallance, and R.D. Stark III, "Computing the Noise Induced Vibration of an Expanding Nozzle of a Rocket Engine due to Acoustics Loads," AIAA Journal of Spacecraft and Rockets, Vol. 35, No. 3, May-June 1998, pp. 355-360.
  45. S. T. Raveendra, N. Vlahopoulos, and A. Glaves, "An Indirect Boundary Element Formulation for Multi-Valued Impedance Simulation in Structural Acoustics,” Applied Mathematical Modeling, Vol. 22, 1998, pp. 379-393.
  46. N. Vlahopoulos and S.T. Raveendra, "Formulation, Implementation, and Validation of Multiple Connection and Free Edge Constraints in an Indirect Boundary Element Formulation," Journal of Sound and Vibration, Vol. 210, No.1, 1998, pp. 137-152.
  47. B. K. Gardner, J.S. Bolton, S.T. Raveendra, and N. Vlahopoulos, "Radiation Efficiency Calculations for Verification of Boundary Element Acoustic Codes," Noise Control Engineering Journal, Vol. 44, No. 5, Sept./Oct. 1996, pp. 215-223.
  48. T.C. Tecco, N. Vlahopoulos, and E.J. Vorenkamp, "Application of Numerical Acoustic Methods to Noise Reduction in Vehicle Compartments," SAE Paper No.932433, SAE Journal of Commercial Vehicles, 1993, Vol. 102, pp. 355-360.
  49. N. Vlahopoulos, "A Numerical Structure-Borne Noise Prediction Scheme Based on the Boundary Element Method, with a New Formulation for the Singular Integral," Computers and Structures, Vol. 50, No. 1, 1994, pp. 97-110.
  50. N. Vlahopoulos and M.M. Bernitsas, "Static, Dynamic, and Eigen Analysis of  Non-Integral Production Risers," Applied Ocean Research, Vol. 10, No. 3, July 1988.
  51. M. M. Bernitsas and N. Vlahopoulos, "Static Non-Linear Three-Dimensional Analysis of a Riser Bundle by a Substructuring and Incremental Finite Element Algorithm," International Journal for Numerical Methods in Engineering, Vol.28, 1989, pp. 2517-2540.
  52. N. Vlahopoulos and M.M. Bernitsas, "Three-Dimensional Nonlinear Dynamics of Nonintegral Riser Bundle," Journal of Ship Research, 1991.
  53. M. M. Bernitsas and N. Vlahopoulos, "Three-Dimensional Nonlinear Static of Pipelaying Using Condensation in an Incremental Finite Element Algorithm," Computers and Structures, Vol. 35, No. 3, pp. 195-214, 1990.
  54. N. Vlahopoulos and M.M. Bernitsas, "Three-Dimensional Nonlinear Dynamics of Pipelaying," Applied Ocean Research, Vol. 12, No. 3, 1990.

Shorter Communications, Letters, Notes or Briefs in Refereed Publications

  1. N. Vlahopoulos, K.H. Lyle, and C.L. Burley, "Technical Note: Preliminary Work for Modeling the Propellers of an Aircraft as a Noise Source in an Acoustic Boundary Element Analysis," Noise Control Engineering Journal, Vol. 46, No. 3, 1998, pp. 132-136.(invited contribution).                                                     

Refereed Conference or Symposium Proceedings

  1. N. Vlahopoulos, S. Li, J. Sun, “Combining energy boundary element and energy finite element simulations for airborne noise analysis,” Proceedings of IMECE06, 2006 ASME International Mechanical Engineering Congress and Exposition, November 2006, Chicago, Illinois, USA, IMECE Paper 2006-14117.
  2. G. Zhang, N. Vlahopoulos, J. Sun, “Substructuring developments in the energy finite element formulation,” Proceedings of IMECE06, 2006 ASME International Mechanical Engineering Congress and Exposition, November 2006, Chicago, Illinois, USA, IMECE Paper 2006-14114.
  3. J. Sun, G. Zhang, N. Vlahopoulos, S-B. Hong, “Multi-disciplinary design optimization under uncertainty for thermal protection system applications,” 11th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, September 2006, Portsmouth, Virginia, AIAA Paper 2006-7002.
  4. J. Sun, J. He, N. Vlahopoulos, P. van Ast, “Model update and variability assessment for automotive crash simulations,” XXVI International Modal Analysis Conference, 2007, Orlando Fl, February 2007, IMAC-Paper No. 199.
  5. G. Zhang, N. Vlahopoulos, R. Goetz, R. Van De Velde, “Blast event simulations for a vehicle structure subjected to an explosion,” XXVI International Modal Analysis Conference, 2007, Orlando Fl, February 2007, IMAC-Paper No. 200.
  6. G. Zhang, N. Vlahopoulos, “An energy based boundary element method for computing the acoustic field around a vehicle,” XXVI International Modal Analysis Conference, 2007, Orlando Fl, February 2007, IMAC-Paper No. 201.
  7. G. Zhang, N. Vlahopoulos, “Substructuring in an energy finite element formulation for analyzing complex structural-acoustic systems,” XXVI International Modal Analysis Conference, 2007, Orlando Fl, February 2007, IMAC-Paper No. 202.
  8. J. Sun, J. He, N. Vlahopoulos, P. van Ast, “Model update and statistical correlations metrics for automotive crash simulations,” 2007 SAE Congress, SAE Paper No. 2007-01-1744.
  9. G. Zhang, N. Vlahopoulos, “A substructuring formulation for the energy finite element analysis,” 2007 SAE Noise and Vibration Conference, SAE Paper No. 2007-01-2325.
  10. G. Zhang, and N. Vlahopoulos, “Validation of an EFEA formulation for computing the vibrational response of complex structures,” 2007 SAE Noise and Vibration Conference, SAE Paper No. 2007-01-2324.
  11. N. Vlahopoulos, G. Zhang, J. He, “Combining an energy boundary element with an energy finite element analysis for airborne noise simulations,” 2007 SAE Noise and Vibration Conference, SAE Paper No. 2007-01-2178.
  12. N. Vlahopoulos, S. Li, M. Victorovitch, D. Caprioli, “Validation of a hybrid finite element formulation for mid-frequency analysis of vehicle structures,” 2007 SAE Noise and Vibration Conference, SAE Paper No. 2007-01-2303.
  13. Jin Wang, N. Vlahopoulos, D. J. Gorshich, “Metamodel development based on a non-parametric isotropic covariance estimator and application in a V6 engine,” SAE World Congress 2004, SEA paper number 2004-01-1142..
  14. S. B. Hong, N. Vlahopoulos, “A Hybrid Finite Element Formulation for Analyzing Systems of Beams and Plates in the Mid-Frequency Range,” SAE Noise and Vibration Conference, Traverse City, May 2003, SAE Paper 2003-01-1610.
  15. O. Ebrat, Z. P. Mourelatos, K. Hu, N. Vlahopoulos, K. Vaidyanathan, “Structural Vibration of an Engine Block and a Rotating Crankshaft coupled through Elastohydrodynamic Bearings,” SAE Noise and Vibration Conference, Traverse City, May 2003, SAE Paper 2003-01-1724.
  16. J. Wang, N. Vlahopoulos, Z. P. Mourelatos, O. Ebrat, K. Vaidyanathan, “Probabilistic Analysis for the Performance of Engine Bearings due to Variability in Bearing Properties,” SAE Noise and Vibration Conference, Traverse City, May 2003, SAE Paper 2003-01-1733.
  17. A. Wang, N. Vlahopoulos, K. Wu, “An Energy Boundary Element Formulation for Sound Radiation at High Frequencies, Internoise 2002, Dearborn, MI.
  18. W. Zhang, A. Wang, N. Vlahopoulos, K. Wu, “High Frequency Vibration Analysis of Heavy Fluid-Loaded Plates by an Energy Finite Element Analysis Formulation,” Internoise 2002, Dearborn, MI.
  19. N. Vlahopoulos, J. Wang, K. Hu, Z. Mourelatos, “Rigid and Flexible Dynamic Response of a Rotating Shaft on Flexible Supports with Clearances,” Internoise 2002, Dearborn, MI.
  20. N. Vlahopoulos, J. Wang, O. Ebrat, Z. Mourelatos, “An Efficient Finite Difference Formulation for Computing Main Bearing Hydrodynamic Characteristics,” Internoise 2002, Dearborn, MI.
  21. S. B. Hong, N. Vlahopoulos, “A Hybrid Finite Element Formulation for Analyzing Systems of Beams and Plates in the Mid-Frequency Range” Internoise 2002, Dearborn, MI.
  22. Z. Zhang, N. Vlahopoulos, S. T. Raveendra, T. Allen, and K. Y. Zhang, “A Computational Acoustic Field Reconstruction Process based on an Indirect Variational Boundary Element Formulation,” ASME IMECE, Nashville, TN, November 1999, pp. 43-50.
  23. G. Borlase, N. Vlahopoulos, “Design Optimization process for minimizing High Frequency Vibration based on an Energy Finite Element Formulation,” ASME IMECE, Nashville, TN, November 1999, pp. 51-60.
  24. M. J. Allen, N. Vlahopoulos, “Numerical Prediction of Noise Radiated from a Panel Subjected to Boundary Layer Excitation,” ASME IMECE, Nashville, TN, November 1999, pp. 67-75.
  25. X. Zhao, N. Vlahopoulos, “A Hybrid Finite Element Method for Calculating the Vibration of Co-Linear Beams in the Mid-Frequency Range,” ASME IMECE, Nashville, TN, November 1999, pp. 91-101.
  26. X. Zhao, N. Vlahopoulos, “Coupling of Finite Element and Energy Finite Element Solutions for Calculating the Vibration of Co-linear Beams in the Mid-Frequency Range,” SAE Noise and Vibration Conference 1999, SAE Paper Number 1999-01-1793, Traverse City, Michigan.
  27. N. Vlahopoulos, L. O. Garza-Rios, R. K. Nelson, “High Frequency Vibration Analysis Performed by a Statistical Energy Formulation and an Energy Finite Element Formulation,” 1998 International Mechanical Engineering Congress & Exhibition, Anaheim CA, November 1998, pp.355-364 (invited paper).
  28. N. Vlahopoulos, Y. Kalish, R.D. Stark III, "Simulation of the Noise Radiated from an Operating Diesel Engine," 1997 International Mechanical Engineering Congress & Exhibition, Dallas, Texas, NCA-Vol. 24, Proceedings of the ASME Noise Control and Acoustics Division, pp. 279-284 (invited paper).
  29. N. Vlahopoulos, S.T. Raveendra, "A Formulation of Unequal Impedance Boundary Conditions in Boundary Element Acoustics," 1997 International Mechanical Engineering Congress & Exhibition, Dallas, Texas, NCA-Vol. 24, Proceedings of the ASME Noise Control and Acoustics Division, pp. 337-342  (invited paper).
  30. N. Vlahopoulos, R.D. Stark III, and W. Kargus, "A New Methodology of Applying Measured Acceleration and Forces as Excitation on Powertrain Models for Noise Prediction," Noise Control in Engines/Powertrain, 1996 ASME International Mechanical Engineering Conference and Exhibition, Atlanta, 1996 (invited paper).
  31. N. Vlahopoulos, E.V. Shalis, and M.A. Latcha, "A Numerical Approach for the Prediction and Reduction of Structure-Borne Noise During the Design Stage of Ground Vehicles," presented at the 14th ASME Conference on Mechanical Vibration and Noise.
  32. G. Borlase, N. Vlahopoulos, L.O. Garza-Rios, “A Design Optimization Process based on an Energy Finite Element Formulation,” 1999 ASME DETC, September 12-16, 1999, Las Vegas, Nevada. (invited paper)
  33. N. Vlahopoulos, T. Allen, X. Zhao, "An Approach for Modeling Spot-Welded Joints in an Energy Finite Element Formulation," Noise-Con ’98, pp. 347-352.
  34. N. Vlahopoulos, K.H. Lyle, and C.L. Burley, "A Formulation and Preliminary Validation of an Algorithm Prescribing the Propellers of an Aircraft as Excitation in a Boundary Element Analysis," Noise-Con ’98, pp. 639-642.
  35. C. Birkett, N. Vlahopoulos, E. Shalis, Z. Wu, "Numerical Load Generation, Vibration Analysis, and Acoustic Signature Prediction of a Ground Vehicle," Noise-Con 97, pp. 123-128.
  36. N. Vlahopoulos, S. Raveendra, B.K. Gardner, and S. Messer "Numerical Computation of Noise Transmitted Inside a Payload Fairing due to External Reverberant Field Excitation," Proceedings Noise-Con '96, pp. 775-778, Sept. 29-Oct. 2, 1996, Seattle, Washington (invited paper).
  37. S. T. Raveendra and N. Vlahopoulos, "Simulation of Multi-Frequency Acoustic Problems Using Indirect Boundary Element Method," Proceedings Noise-Con '96, pp. 775-778, Sept. 29-Oct. 2, 1996, Seattle, Washington.
  38. C. Vallance and N. Vlahopoulos, "Structural Noise Induced Vibration Prediction for a Component of a Launch Vehicle," Internoise 1995, July 10-12 1995, pp.1303-1306.
  39. N. Vlahopoulos, S. Raveendra, and C. Mollo, "Acoustic Sensitivity Analysis Using Boundary Elements and Structural Dynamic Response," The 1994 MSC User's Conference, June 20-24, 1994.
  40. N. Vlahopoulos, C. Dagg, and R.J. Bernhard, "Computation of Sensitivities for Passive Noise Control," presented at Noise-Con '93, Williamsburg, Virginia, May 1993, pp. 529-534.
  41. N. Vlahopoulos, "Boundary Element Formulations for Acoustic Sensitivities with Respect to Structural Design Variables, and Acoustic Impedance," presented at the Second International Congress on Recent Developments in Air- and Structure-borne Sound and Vibration, Auburn University, March 1992, pp. 1019-1026.
  42. F. Aslani, N. Vlahopoulos, and I. Hagiwara, "Comparison of Four Methods for Calculating Vibration Mode Shape Sensitivities," presented in the ADPA/AIAA/ASME/SPIE Conference on Active Materials and Adaptive Structures, Alexandria, VA, November 1991.
  43. X. Zhao, N. Vlahopoulos, “An Investigation of Power Flow in the Mid-Frequency Range for Systems of Co-Linear Beams based on a Hybrid Finite Element Formulation,” 2000 International Mechanical Engineering Congress & Exhibition, Orlando,Florida, NCA-Vol. 27, Proceedings of the ASME Noise Control and Acoustics Division, pp. 81-100.
  44. Xi Zhao, N. Vlahopoulos, “A Hybrid Finite Element Formulation for Mid-Frequency Analysis of Systems with Excitation Applied on Short Members,” NCA-Vol. 27, Proceedings of the ASME Noise Control and Acoustics Division, pp. 101-116.
  45. Zhidong Zhang, N. Vlahopoulos, T. Allen, and K. Y. Zhang, “A Source Reconstruction Process based on an Indirect Variational Boundary Element Formulation,” NCA-Vol. 27, Proceedings of the ASME Noise Control and Acoustics Division, pp. 367-376.
  46. M. J. Allen, N. Vlahopoulos, B. J. Saltsman, “Computation of Wind Noise Radiated from a Flexible and Elastically Supported Panel,” 2001 SAE Noise and Vibration Conference, SAE Paper No. 2001-01-1495.
  47. Z. Zhang, N. Vlahopoulos, T. Allen, K. Zhang, X. Huang, D. Moenssen, “Development and Validation of a Computational Process for Pass-by Noise Simulation,” 2001 SAE Noise and Vibration Conference, SAE Paper No. 2001-01-1561.
  48. K.K. Choi, J. Dong, N. Vlahopoulos, A. Wang, W. Zhang, “Parametric Design Sensitivity Analysis of High Frequency Structural-Acoustic Problems using Energy Finite Element Method,” ASME DAC Conference 2003, Best Paper Award.
  49. A. Wang, N. Vlahopoulos, R. D. Buehrle, and J. Klos, “Energy Finite Element Analysis of the NASA Aluminum Test-Bed Cylinder,” SAE Paper No. 2005-01-2372, 2005 SAE Noise and Vibration Conference, Traverse City, MI.
  50. S.B. Hong, N. Vlahopoulos, R. Mantey, D. Gorsich, “A Computational Approach for Evaluating the Acoustic Detection of a Military Vehicle,” SAE Paper No. 2005-01-2337, 2005 SAE Noise and Vibration Conference, Traverse City, MI.
  51. S. B. Hong, N. Vlahopoulos, “A Hybrid Finite Element Formulation for Analyzing the Structure-Borne Noise in a Body-in-White,” SAE Paper No. 2005-01-2421, 2005 SAE Noise and Vibration Conference, Traverse City, MI.
  52. J. Sun, N. Vlahopoulos, K. Hu, “Model update under uncertainty and error estimation in shock applications,” SAE Paper No. 2005-01-2373, 2005 SAE Noise and Vibration Conference, Traverse City, MI.
  53. N. Vlahopoulos, A. Wang, K. Wu, “An EFEA formulation for computing the structural response of complex structures,” Proceedings of IMECE 05, 2005 ASME IMECE, November 5 – 11, 2205, Orlando FL, Paper Number IMECE2005-81113.
  54. S.B. Hong, N. Vlahopoulos, “A hybrid finite element formulation for computing structure – borne vibration in a body in white,” 2006 SAE Congress, SAE Paper 2006-01-1224.
  55. J. Sun, N. Vlahopoulos, T. J. Stabryla, R. Goetz, R. Van De Velde, “Simulations under uncertainty for occupant safety for a vehicle subjected to a blast load,” 2006 SAE Congress, SAE Paper 2006-01-0762.
  56. J. Sun, N. Vlahopoulos, T. J. Stabryla, R. Goetz, R. Van De Velde, “Blast event simulation for a structure subjected to a landmine explosion,” 2006 SAE Congress, SAE Paper 2006-01-0931.

Refereed Conference Summaries or Abstracts  

  1. S. B. Hong, N. Vlahopoulos, “A Hybrid Finite Element Formulation for Analyzing Systems of Beams and Plates in the Mid-Frequency Range” ASA Meeting November 2002.
  2. M. J. Allen, N. Vlahopoulos, “Noise generated from a flexible and elastically supported structure subjected to turbulent boundary layer excitation,” 139th Meeting of ASA, Atlanta, GA, June 2000.
  3. N. Vlahopoulos, Sandy Liu, “A formulation for modeling the operating propellers of an aircraft as a noise source in an acoustic boundary element analysis,” 139th Meeting of ASA, Atlanta, GA, June 2000.
  4. Zhao, N. Vlahopoulos, “A hybrid finite element formulation for mid-frequency analysis of systems with excitation applied on short members,” 139th Meeting of ASA, Atlanta, GA, June 2000.
  5. X. Zhao, N. Vlahopoulos, “Investigation of power flow in the mid-frequency range for systems of co-linear beams based on a hybrid finite element formulation,” 139th Meeting of ASA, Atlanta, GA, June 2000.
  6. X. Zhao, N. Vlahopoulos, “Basic Development of a Hybrid Finite Element Method for Mid-frequency Computations of Structural Vibrations,” 138th Meeting of ASA, Columbus, Ohio, November 1999.
  7. Borlase, N. Vlahopoulos, “An Energy Finite Element Analysis Optimization Process for Reducing High-Frequency Vibration in Structures,” 138th Meeting of ASA, Columbus, Ohio, November 1999.
  8. Zhang, N. Vlahopoulos, S. T. Raveendra, T. Allen, K. Zhang, “A Computational Acoustic Field Reconstruction Process based on an Indirect Variational Boundary Element Formulation,” 138th Meeting of ASA, Columbus, Ohio, November 1999.
  9. N. Vlahopoulos, R. D. Stark III, and W. Kargus IV, “A new methodology of applying measured acceleration and forces as excitation on powertrain models,” 131st Meeting, Acoustical Society of America, Indianapolis, Indiana, May 1996 (invited presentation).
  10. N. Vlahopoulos, K. H. Lyle, C. L. Burley, “A formulation and preliminary validation of an algorithm prescribing the propellers of an aircraft as excitation in an acoustic boundary element analysis,” 136th Meeting, Acoustical Society of America, Norfolk, Virginia, October 1998.
  11. M. J. Allen, N. Vlahopoulos, “Numerical prediction of noise radiated from a panel subjected to boundary layer excitation,” 136th Meeting, Acoustical Society of America, Norfolk, Virginia, October 1998.
  12. N. Vlahopoulos, L. O. Garza-Rios, C. Mollo, “Numerical implementation and marine applications of an energy finite element formulation,” 136th Meeting, Acoustical Society of America, Norfolk, Virginia, October 1998.
  13. X. Zhao, N. Vlahopoulos, T. Allen, “An approach for modeling spot-welded joints in an energy finite element formulation,” 136th Meeting, Acoustical Society of America, Norfolk, Virginia, October 1998.
  14. L. Mongeau, J. Fazzio, and N. Vlahopoulos, “Sound radiated from flow-excited, elastically supported rectangular panels,” 137th Meeting, Acoustical Society of America, Berlin, Germany, March 1999. (invited presentation)

Chapters in Books

  1.  “Chapter 7, Indirect Variational Boundary Element Method,” in a book entitled, BEM in Acoustics edited by C. Brebbia and T. Wu, 2000, WIT press.                                           

Government, University, or Industrial Reports (nonrefereed)

  1. Software Manual "COMET/Acoustics, User's Manual, Version 3.1," Automated Analysis Corporation, 1996. 

 
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