Photo of Eric Greenwood

Eric Greenwood

Assistant Professor

Affiliation(s):

  • Aerospace Engineering
  • Center for Acoustics and Vibration
  • Acoustics

229E Hammond Building

eric.greenwood@psu.edu

814-863-9712

Research Website

 
 

 

Education

  • BS, Mechanical Engineering, Rochester Institute of Technology, 2005
  • MS, Aerospace Engineering, University of Maryland, 2008
  • Ph D, Aerospace Engineering, University of Maryland, 2011

Publications

Journal Articles

  • Joel Rachaprolu and Eric Greenwood, 2024, "Helicopter Noise Source Separation Using an Order Tracking Filter", Jounal of the American Helicopter Society, 69, (1)
  • Eric Greenwood, Ben W Sim and D Douglas Boyd, 2024, "The Effects of Ambient Conditions on Helicopter Harmonic Noise Radiation: Theory and Experiment", Journal of the American Helicopter Society, 69, (1)
  • Nicholas Blaise Konzel and Eric Greenwood, 2023, "Variability of Small Multirotor Aircraft Noise Measurements", Noise Control Engineering Journal, 71, (6), pp. 10
  • David Coleman, Atanu Halder, Farid Saemi, Carl Runco, Hunter Denton, Bochan Lee, Vishaal Subramanian, Eric Greenwood, Vinod Lakshminarayan and Moble Benedict, 2023, "Development of Aria, a Compact, Ultra-Quiet Personal Electric Helicopter", Journal of the American Helicopter Society, 68, (4)
  • Eric Greenwood, Kenneth S Brentner, Robert Rau and Ze Feng Ted Gan, 2022, "Challenges and Opportunities for Low Noise Electric Aircraft", International Journal of Aeroacoustics, 27, (5-7), pp. 66
  • James H Stephenson, Michael E Watts, Eric Greenwood and Kyle A Pascioni, 2022, "Development and Validation of Generic Maneuvering Flight Noise Abatement Guidance for Helicopters", Journal of the American Helicopter Society, 67, (1), pp. 12
  • Eric Greenwood and Robert F Rau, 2020, "A Maneuvering Flight Model for Helicopter Mission Planning", Journal of the American Helicopter Society
  • Eric Greenwood and Ben W Sim, 2018, "Effects of Crosswind Flight on Rotor Harmonic Noise Radiation", Journal of Aircraft, 55, (5), pp. 2137-2148
  • Eric Greenwood and Fredric H Schmitz, 2018, "A Parameter Identification Method for Helicopter Noise Source Identification and Physics-Based Semiempirical Modeling", Journal of the American Helicopter Society, 63, (3), pp. 1414-1426
  • Eric Greenwood, Fredric H Schmitz and Richard D Sickenberger, 2015, "A Semiempirical Noise Modeling Method for Helicopter Maneuvering Flight Operations", Journal of the American Helicopter Society, 60, (2), pp. 1-13
  • James H Stephenson, Charles Tinney, Eric Greenwood and Michael E Watts, 2014, "Time Frequency Analysis of Sound from a Maneuvering Rotorcraft", Journal of Sound and Vibration, 333, (21), pp. 5324-5339
  • Eric Greenwood and Fredric H Schmitz, 2014, "Separation of Main and Tail Rotor Noise from Ground-Based Acoustic Measurements", Journal of Aircraft
  • Eric Greenwood and Fredric H. Schmitz, 2014, "Effects of Ambient Conditions on Helicopter Rotor Source Noise Modeling", Journal of Aircraft, 51, (1), pp. 90-103

Conference Proceedings

  • Eric Mcthane, Raja A.R. Zahirudin, Aaron Hafner, Eric Greenwood and Jose Palacios, 2023, "Effects of Varying Separation Distance on the Acoustics and Performance of Counter-Rotating Coaxial Rotors", AIAA Aviation Forum 2023, San Diego, CA
  • Raja A.R. Zahirudin, Vitor T. Valente, Eric Mcthane, Aaron Hafner, Zach Birkbeck, Sihong Yang, Eric Greenwood and Jose Palacios, 2023, "The Effect of Phase Offset Angle for Coaxial Co-Rotating Rotors", Vertical Flight Society 79th Annual Forum, West Palm Beach, FL
  • Bhaskar Mukherjee, Andrew Jue, Jean-Pierre Theron, Kenneth S Brentner, Eric Greenwood and Joseph F Horn, 2023, "Investigation of Departure Transition Noise for Lift-Plus-Cruise eVTOL Aircraft", Vertical Flight Society 79th Annual Forum, West Palm Beach, FL
  • Mrunali Botre, Dan Wachspress, Eric Greenwood and Kenneth S Brentner, 2023, "Onboard Acoustic Prediction Method for VTOL Aircraft", Vertical Flight Society 79th Annual Forum, West Palm Beach, FL
  • Vitor T, Valente, Eric Greenwood and Eric Johnson, 2023, "An Experimental Investigation of eVTOL Flight State Variance on Noise", Vertical Flight Society 79th Annual Forum, West Palm Beach, FL
  • Robert F. Rau and Eric Greenwood, 2023, "A Parametric Investigation of Rotor-Rotor Interaction Noise Generation", Vertical Flight Society 79th Annual Forum, West Palm Beach, FL
  • Keon W Hur, Damaris R Zachos, Kenneth S Brentner and Eric Greenwood, 2023, "Determining the Acoustic Far Field for Multirotor Aircraft", Vertical Flight Society Autonomous VTOL Technical Meeting, Mesa, AZ
  • Vitor Tumelero Valente, Eric N Johnson and Eric Greenwood, 2022, "Implementation of a Phase Synchronization Algorithm for Multirotor UAVs", IEEE/AIAA 41st Digital Avionics Systems Conference (DASC), Portsmouth, VA, Portsmouth, VA
  • Robert F. Rau and Eric Greenwood, 2022, "A Dynamic Wake Model for Multirotor Aircraft", AIAA Aviation Forum 2022, Chicago, IL
  • Eric Greenwood and Nicholas Blaise Konzel, 2022, "Measurement and Characterization of Multirotor Unmanned Aerial System Noise", NOISE-CON 2022, Lexington, KY
  • Ze Feng Gan, Kenneth S Brentner and Eric Greenwood, 2022, "Time Variation of Helicopter Rotor Broadband Noise", 28th AIAA/CEAS Aeroacoustics Conference, Southampton, UK, pp. 2914
  • Damaris R Zachos, Lauren Weist, Kenneth S Brentner and Eric Greenwood, 2022, "Variation in Helicopter Noise During Approach Maneuvers", Vertical Flight Society 78th Annual Forum, Ft. Worth, TX
  • Bhaskar Mukherjee, Kenneth S Brentner, Eric Greenwood, Jean-Pierre Theron and Joseph F Horn, 2022, "An Investigation of Piloting and Flight Control Strategies on Generic eVTOL Noise", Vertical Flight Society 78th Annual Forum, Ft. Worth, TX
  • Andrew Christian, Randall Ali and Eric Greenwood, 2022, "An n-order hold approach for fractional-delay interpolation in auralization", The Journal of the Acoustical Society of America, Acoustical Society of America, 151, (4), pp. A188--A188
  • Nicholas Blaise Konzel and Eric Greenwood, 2022, "Ground-based Acoustic Measurements of Small Multirotor Aircraft", Vertical Flight Society 78th Annual Forum, Ft. Worth, TX
  • Joel Sundar Rachaprolu and Eric Greenwood, 2022, "Helicopter Noise Source Separation Using an Order Tracking Filter", Vertical Flight Society 78th Annual Forum, Ft. Worth, TX
  • Raja Akif Raja Zahirudin, Daniel Weitsman, Eric Greenwood and Jose Palacios, 2021, "The Development of a Coaxial Acoustics Test System for Rotor Noise", Vertical Flight Society 77th Annual Forum, Virtual
  • David Coleman, Atanu Halder, Farid Saemi, Carl Runco, Hunter Denton, Bochan Lee, Vishaal Subramanian, Eric Greenwood, Vinod Lakshminarayan and Moble Benedict, 2021, "Development of "Aria," a Compact, Ultra-Quiet Personal Electric Helicopter", Vertical Flight Society 77th Annual Forum, Virtual
  • Bhaskar Mukherjee, Ze Feng Ted Gan, Jean-Pierre Theron, Kenneth S Brentner, Eric Greenwood and Joseph F Horn, 2021, "A New Distributed Electric Propulsion Aircraft Simulation Tool for Coupled Flight Dynamics, Free Wake, and Acoustic Predictions", Vertical Flight Society 77th Annual Forum, Virtual
  • Daniel Weitsman and Eric Greenwood, 2021, "Parametric Study of eVTOL Rotor Acoustic Design Trades", AIAA Scitech 2021 Forum, Virtual
  • Ze Feng Ted Gan, Kenneth S Brentner and Eric Greenwood, 2021, "Time Variation of Rotor Broadband Noise", 2021 Autonomous VTOL Technical Meeting and Electric VTOL Symposium, Virtual, Vertical Flight Society
  • Kyle A Pascioni, Eric Greenwood, Michael E Watts, Charles D Smith and James H Stephenson, 2020, "Medium-Sized Helicopter Noise Abatement Flight Test", Vertical Flight Society 76th Annual Forum, Virtual, Vertical Flight Society
  • James H Stephenson, Michael E Watts, Eric Greenwood and Kyle A Pascioni, 2020, "Development and Validation of Generic Maneuvering Flight Noise Abatement Guidance for Helicopters", Vertical Flight Society 76th Annual Forum, Virtual, Vertical Flight Society
  • Anna C. Trujillo, Eric Greenwood and Daniel R. Hill, 2020, "Helicopter Noise Footprint Depiction During Simulated Flight for Training", Advances in Intelligent Systems and Computing, 1212, pp. 554-561
  • Eric Greenwood, 2019, "Dynamic Replanning of Low Noise Rotorcraft Operations", Vertical Flight Society 75th Annual Forum, Philadelphia, PA
  • Andrew Christian, Jarrett Caston and Eric Greenwood, 2019, "Regarding the Perceptual Significance and Characterization of Broadband Components of Helicopter Source Noise", Vertical Flight Society 75th Annual Forum, Philadelphia, PA
  • Eric Greenwood, 2018, "Estimating Helicopter Noise Abatement Information with Machine Learning", American Helicopter Society 74th Annual Forum
  • Eric Greenwood, 2017, "Real Time Helicopter Noise Modeling for Pilot Community Noise Awareness", NOISE-CON 2017, Grand Rapids, MI
  • Eric Greenwood, 2017, "Helicopter Flight Procedures for Community Noise Reduction", American Helicopter Society 73rd Annual Forum, Fort Worth, TX, pp. 1-14
  • Michael E Watts, Eric Greenwood and James H Stephenson, 2016, "Measurement and Characterization of Helicopter Noise at Different Altitudes", American Helicopter Society 72nd Annual Forum, West Palm Beach, FL, 1, pp. 19-33
  • Carlos Malpica, Eric Greenwood and Ben W Sim, 2016, "Parametric Investigation of the Effect of Hub Pitching Moment on Blade Vortex Interaction (BVI) Noise of an Isolated Rotor", American Helicopter Society 72nd Annual Forum, West Palm Beach, FL
  • Eric Greenwood, Ben W Sim and D Douglas Boyd, 2016, "The Effects of Ambient Conditions on Helicopter Harmonic Noise Radiation: Theory and Experiment", American Helicopter Society 72nd Annual Forum, West Palm Beach, FL
  • Carlos A Malpica, Eric Greenwood and Ben W Sim, 2016, "Helicopter Non-Unique Trim Strategies for Blade-Vortex Interaction (BVI) Noise Reduction", American Helicopter Society Technical Meeting on Aeromechanics Design for Vertical Lift, San Francisco, CA
  • Eric Greenwood, Robert Rau, Benjamin May and Christopher Hobbs, 2015, "A Maneuvering Flight Noise Model for Helicopter Mission Planning", American Helicopter Society 71st Annual Forum, Virginia Beach, VA, (January)
  • James H Stephenson and Eric Greenwood, 2015, "Effects of Vehicle Weight and True Versus Indicated Airspeed on BVI Noise During Steady Descending Flight", American Helicopter Society 71st Annual Forum, Virginia Beach, VA
  • Eric Greenwood and Ben W. Sim, 2013, "he Effects of Crosswind Flight on Rotor Harmonic Noise Radiation", American Helicopter Society 69th Annual Forum, Phoenix, AZ
  • Eric Greenwood, Fredric H. Schmitz and Richard D. Sickenberger, 2012, "A Semi-Empirical Noise Modeling Method for Helicopter Maneuvering Flight Operations", American Helicopter Society 68th Annual Forum, Fort Worth, TX
  • Michael E. Watts, Royce Snider, Eric Greenwood and Joel Baden, 2012, "Maneuver Acoustic Flight Test of the Bell 430 Helicopter", American Helicopter Society 68th Annual Forum, Fort Worth, TX, pp. 24-40
  • Eric Greenwood and Fredric H. Schmitz, 2011, "The Effects of Ambient Conditions on Helicopter Rotor Source Noise Modeling", American Helicopter Society 67th Annual Forum, Virginia Beach, VA, pp. 47-65
  • Eric Greenwood and Fredric H. Schmitz, 2010, "A Parameter Identification Method for Helicopter Noise Source Identification and Physics-Based Semi-Empirical Modeling", American Helicopter Society 66th Annual Forum, Phoenix, AZ
  • Eric Greenwood and Fredric H. Schmitz, 2009, "Separation of Main and Tail Rotor Noise Sources from Ground-Based Acoustic Measurements Using Time-Domain De-Dopplerization", 35th European Rotorcraft Forum, Hamburg, DE
  • Eric Greenwood, Fredric H. Schmitz, Gaurav Gopalan and Ben Wel-C Sim, 2007, "Helicopter External Noise Radiation in Turning Flight: Theory and Experiment", American Helicopter Society 63rd Annual Forum, Virginia Beach, VA
  • Fredric H. Schmitz, Eric Greenwood, Richard D. Sickenberger, Gaurav Gopalan, Ben Wel-C Sim, David Conner, Ernesto Moralez and William A. Decker, 2007, "Measurement and Characterization of Helicopter Noise in Steady-State and Maneuvering Flight", American Helicopter Society 63rd Annual Forum, Virginia Beach, VA

Magazines/Trade Publications

Other

  • Eric Greenwood, 2024, "Maneuvering Flight and Operations"

Research Projects

Honors and Awards

  • Alfred Gessow Best Paper Award, Vertical Flight Society, December 2020
  • Fran├žois-Xavier Bagnoud Award, Vertical Flight Society, May 2018
  • Early Career Achievement Medal, National Aeronautics and Space Administration, June 2016

Service

Service to Penn State:

Service to External Organizations:

  • Participation in or Service to Professional and Learned Societies, Chairperson, Fly Neighborly / Environmental Committee, Helicopter Association International, 2022
  • Participation in or Service to Professional and Learned Societies, Committee Member, Acoustics Technical Committee, Vertical Flight Society, May 2021
  • Participation in or Service to Professional and Learned Societies, Committee Member, Fly Neighborly / Environmental Committee, Helicopter Association International, 2017 - 2022