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Nickolas Vlahopoulos
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Proceedings Papers

A New Methodology of Applying Measured Acceleration and Forces as Excitation on Powertrain Models for Noise Prediction

Nickolas Vlahopoulos, Richard D. Stark, III, Walter Kargus, IV
Proc. ASME. IMECE96, Noise Control and Acoustics: Volume 1 — Active Noise and Vibration Control; Complexity in Acoustics; Noise Sources in Internal Combustion Engines; Vehicle Flow/Structure Noises; Aeroacoustic Sound Propagation in Ducts and Jets; Turbomachinery Noise; BS/MS Student Paper Competition, 109-113, November 17–22, 1996
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1996-0516
https://doi.org/10.1115/IMECE1996-0516
View Paper titled, A New Methodology of Applying Measured Acceleration and Forces as Excitation on Powertrain Models for Noise Prediction
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Topics: Excitation, Noise (Sound), Vibration, Acoustics, Boundary element methods, Boundary-value problems, Computer software, Finite element methods, Numerical analysis, Stress
Proceedings Papers

Simulation of the Noise Radiated From an Operating Diesel Engine

Nickolas Vlahopoulos, Yury Kalish, Richard D. Stark, III
Proc. ASME. IMECE97, Noise Control and Acoustics, 279-284, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-1054
https://doi.org/10.1115/IMECE1997-1054
View Paper titled, Simulation of the Noise Radiated From an Operating Diesel Engine
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Topics: Diesel engines, Noise (Sound), Simulation, Vibration, Design, Acoustics, Boundary element methods, Boundary-value problems, Engines, Excitation
Proceedings Papers

A Formulation of Unequal Impedance Boundary Conditions in Boundary Element Acoustics

Nickolas Vlahopoulos, S. T. Raveendra
Proc. ASME. IMECE97, Noise Control and Acoustics, 337-342, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-1062
https://doi.org/10.1115/IMECE1997-1062
View Paper titled, A Formulation of Unequal Impedance Boundary Conditions in Boundary Element Acoustics
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Topics: Acoustics, Boundary element methods, Boundary-value problems, Computer simulation, Computers, Engines, Modeling, Noise (Sound), Space
Proceedings Papers

High Frequency Vibration Analysis Performed by a Statistical Energy Analysis Formulation and an Energy Finite Element Formulation

Nickolas Vlahopoulos, Luis Octavio Garza-Rios, Richard K. Nelson
Proc. ASME. IMECE98, Noise Control and Acoustics, 355-364, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-0530
https://doi.org/10.1115/IMECE1998-0530
View Paper titled, High Frequency Vibration Analysis Performed by a Statistical Energy Analysis Formulation and an Energy Finite Element Formulation
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Topics: Finite element analysis, Vibration analysis, Boats, Computer simulation, Design, Seas
Proceedings Papers

Numerical Prediction of Noise Radiated From a Panel Subjected to Boundary Layer Excitation

Michael Allen, Nickolas Vlahopoulos
Proc. ASME. IMECE99, Noise Control and Acoustics, 67-75, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-0184
https://doi.org/10.1115/IMECE1999-0184
View Paper titled, Numerical Prediction of Noise Radiated From a Panel Subjected to Boundary Layer Excitation
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Topics: Boundary layers, Excitation, Noise (Sound), Acoustics, Pressure, Boundary element methods, Vibration, Aircraft, Algorithms, Automotive industry
Proceedings Papers

Design Optimization Process for Minimizing High Frequency Vibration Based on an Energy Finite Element Formulation

George Borlase, Nickolas Vlahopoulos
Proc. ASME. IMECE99, Noise Control and Acoustics, 51-60, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-0182
https://doi.org/10.1115/IMECE1999-0182
View Paper titled, Design Optimization Process for Minimizing High Frequency Vibration Based on an Energy Finite Element Formulation
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Topics: Design, Finite element analysis, Optimization, Vibration, Boats, Computer simulation, Damping, Flow charts, Hull, Seas
Proceedings Papers

A Computational Acoustic Field Reconstruction Process Based on an Indirect Variational Boundary Element Formulation

Zhidong Zhang, Nickolas Vlahopoulos, S. T. Raveendra, T. Allen, K. Y. Zhang
Proc. ASME. IMECE99, Noise Control and Acoustics, 43-50, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-0181
https://doi.org/10.1115/IMECE1999-0181
View Paper titled, A Computational Acoustic Field Reconstruction Process Based on an Indirect Variational Boundary Element Formulation
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Topics: Acoustics, Boundary element methods, Boundary-value problems, Sound pressure, Transfer functions, Pistons, Algorithms, Computation, Manufacturing
Proceedings Papers

A Hybrid Finite Element Method for Calculating the Vibration of Co-Linear Beams in the Mid-Frequency Range

Xi Zhao, Nickolas Vlahopoulos
Proc. ASME. IMECE99, Noise Control and Acoustics, 91-102, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-0186
https://doi.org/10.1115/IMECE1999-0186
View Paper titled, A Hybrid Finite Element Method for Calculating the Vibration of Co-Linear Beams in the Mid-Frequency Range
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Topics: Finite element methods, Vibration, Finite element analysis, Wavelength, Degrees of freedom, Excitation, Uncertainty
Proceedings Papers

A Computational Process for Pass-by Noise Simulation

Zhidong Zhang, Nickolas Vlahopoulos, T. Allen, K. Y. Zhang
Proc. ASME. IMECE2001, Noise Control and Acoustics, 135-142, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/NCA-23513
https://doi.org/10.1115/IMECE2001/NCA-23513
View Paper titled, A Computational Process for Pass-by Noise Simulation
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Topics: Noise (Sound), Simulation, Acoustics, Boundary element methods, Vehicles, Algorithms, Computer simulation, Engines, Intake manifolds, Sound pressure
Proceedings Papers

Numerical Probabilistic Analysis of Structural/Acoustic Systems

Michael Allen, Nickolas Vlahopoulos
Proc. ASME. IMECE2001, Noise Control and Acoustics, 143-151, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/NCA-23514
https://doi.org/10.1115/IMECE2001/NCA-23514
View Paper titled, Numerical Probabilistic Analysis of Structural/Acoustic Systems
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Topics: Acoustics, Finite element analysis, Manufacturing, Probability, Simulation, Boundary element methods, Computation, Density, Uncertainty
Proceedings Papers

A Hybrid Finite Element Formulation for Mid-Frequency Analysis of Systems With Excitation Applied on Short Members

Xi Zhao, Nickolas Vlahopoulos
Proc. ASME. IMECE2000, Noise Control and Acoustics, 101-115, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1597
https://doi.org/10.1115/IMECE2000-1597
View Paper titled, A Hybrid Finite Element Formulation for Mid-Frequency Analysis of Systems With Excitation Applied on Short Members
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Topics: Excitation, Finite element analysis, Systems analysis, Finite element methods, Wavelength, Boundary-value problems, Dimensions, Flow (Dynamics), Resonance, Vibration
Proceedings Papers

An Investigation of Power Flow in the Mid-Frequency Range for Systems of Co-Linear Beams Based on a Hybrid Finite Element Formulation

Xi Zhao, Nickolas Vlahopoulos
Proc. ASME. IMECE2000, Noise Control and Acoustics, 81-100, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1596
https://doi.org/10.1115/IMECE2000-1596
View Paper titled, An Investigation of Power Flow in the Mid-Frequency Range for Systems of Co-Linear Beams Based on a Hybrid Finite Element Formulation
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Topics: Finite element analysis, Flow (Dynamics), Damping, Radiation (Physics), Simulation, Stiffness
Proceedings Papers

A Source Reconstruction Process Based on an Indirect Variational Boundary Element Formulation

Zhidong Zhang, Nickolas Vlahopoulos, T. Allen, K. Y. Zhang
Proc. ASME. IMECE2000, Noise Control and Acoustics, 367-375, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1624
https://doi.org/10.1115/IMECE2000-1624
View Paper titled, A Source Reconstruction Process Based on an Indirect Variational Boundary Element Formulation
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Topics: Boundary element methods, Vibration, Acoustics, Algorithms, Computation, Sound pressure, Transfer functions
Proceedings Papers

A Design Optimization Process Based on an Energy Finite Element Formulation

George Borlase, Nickolas Vlahopoulos, Luis Octavio Garza-Rios
Proc. ASME. DETC99, Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise, 591-600, September 12–16, 1999
Publisher: American Society of Mechanical Engineers
Paper No: DETC99/VIB-8195
https://doi.org/10.1115/DETC99/VIB-8195
View Paper titled, A Design Optimization Process Based on an Energy Finite Element Formulation
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Topics: Design, Finite element analysis, Optimization, Boats, Computer simulation, Damping, Flow charts, Hull, Seas, Simulation
Proceedings Papers

Structural-Acoustic Simulations of Naval Vehicles Using an Energy Finite Element Method

Nickolas Vlahopoulos
Proc. ASME. IDETC-CIE2011, Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B, 509-516, August 28–31, 2011
Publisher: American Society of Mechanical Engineers
Paper No: DETC2011-47758
https://doi.org/10.1115/DETC2011-47758
View Paper titled, Structural-Acoustic Simulations of Naval Vehicles Using an Energy Finite Element Method
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Topics: Acoustics, Finite element methods, Simulation, Vehicles, Design, Vibration, Hull, Noise (Sound), Ships, Cycles
Proceedings Papers

Multi-Discipline Design of a Wind Turbine

Nickolas Vlahopoulos, Hong Yoon Kim, Kevin Maki, Ricardo Sbragio
Proc. ASME. IDETC-CIE2011, Volume 5: 37th Design Automation Conference, Parts A and B, 291-301, August 28–31, 2011
Publisher: American Society of Mechanical Engineers
Paper No: DETC2011-47756
https://doi.org/10.1115/DETC2011-47756
View Paper titled, Multi-Discipline Design of a Wind Turbine
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Topics: Design, Engineering disciplines, Wind turbines, Blades, Decision making, Geometry, Algorithms, Chords (Trusses), Complex systems, Energy generation
Proceedings Papers

Multidisciplinary Design Optimization of Ship Hull Forms Using Metamodels

Jim He, Shari Hannapel, Nickolas Vlahopoulos
Proc. ASME. IDETC-CIE2011, Volume 5: 37th Design Automation Conference, Parts A and B, 847-856, August 28–31, 2011
Publisher: American Society of Mechanical Engineers
Paper No: DETC2011-47761
https://doi.org/10.1115/DETC2011-47761
View Paper titled, Multidisciplinary Design Optimization of Ship Hull Forms Using Metamodels
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Topics: Design, Hull, Optimization, Ships, Computation, Engineering simulation, Simulation, Computational fluid dynamics, Computer simulation, Engineering disciplines
Proceedings Papers

Probabilistic Main Bearing Performance for an Internal Combustion Engine

Zissimos P. Mourelatos, Nickolas Vlahopoulos, Omidreza Ebrat, Jinghong Liang, Jin Wang
Proc. ASME. TRIB2004, ASME/STLE 2004 International Joint Tribology Conference, Parts A and B, 831-840, October 24–27, 2004
Publisher: American Society of Mechanical Engineers
Paper No: TRIB2004-64058
https://doi.org/10.1115/TRIB2004-64058
View Paper titled, Probabilistic Main Bearing Performance for an Internal Combustion Engine
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Topics: Bearings, Internal combustion engines, Engines, Algorithms, Clearances (Engineering), Cycles, Density, Design, Dynamics (Mechanics), Film thickness
Proceedings Papers

Parametric Design Sensitivity Analysis of High Frequency Structural-Acoustic Problems Using Energy Finite Element Method

Kyung K. Choi, Jun Dong, Nickolas Vlahopoulos, Aimin Wang, Weiguo Zhang
Proc. ASME. IDETC-CIE2003, Volume 2: 29th Design Automation Conference, Parts A and B, 481-493, September 2–6, 2003
Publisher: American Society of Mechanical Engineers
Paper No: DETC2003/DAC-48753
https://doi.org/10.1115/DETC2003/DAC-48753
View Paper titled, Parametric Design Sensitivity Analysis of High Frequency Structural-Acoustic Problems Using Energy Finite Element Method
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Topics: Acoustics, Design sensitivity analysis, Finite element methods, Parametric design, Radiation (Physics), Sensitivity analysis
Proceedings Papers

An Energy Boundary Element Formulation for Predicting the Acoustic Field Around a Vehicle at High Frequencies Due to Airborne Noise Sources

Aimin Wang, Nickolas Vlahopoulos, Jason Zhu, Mike Qian
Proc. ASME. IMECE2003, Transportation: Making Tracks for Tomorrow’s Transportation, 155-161, November 15–21, 2003
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2003-55334
https://doi.org/10.1115/IMECE2003-55334
View Paper titled, An Energy Boundary Element Formulation for Predicting the Acoustic Field Around a Vehicle at High Frequencies Due to Airborne Noise Sources
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Topics: Acoustics, Boundary element methods, Noise (Sound), Vehicles, Acoustic intensity, Density, Boundary-value problems, Integral equations, Shapes, Sound