| Aumann, A. R., and Tuttle, B. C., "NASA Auralization Framework 1.2 Upcoming Release," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. NTRS |
| Bahr, C. J., "Toward Relating Open- and Closed-Test Section Microphone Phased Array Aeroacoustic Measurements," AIAA Paper 2021-2127, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |
| Bahr, C. J., Hutcheson, F. V., and Stead, D. J., "Unsteady Propagation and Mean Corrections in Open-Jet and Kevlar® Wind Tunnels," AIAA Journal, Vol. 59, No. 11, pp. 4598 - 4609, November, 2021. DOI |
| Bertsch, L., Sanders, L., Thomas, R. H., LeGriffon, I., June, J. C., Clark, I. A., and Lorteau, M., "Comparative Assessment of Aircraft System Noise Simulation Tools," Journal of Aircraft, Vol. 58, No. 4, pp. 867 - 884, July - August, 2021. DOI |
| Boyd, D. D., "Comprehensive Analysis + Acoustics," RVLT Rotorcraft Acoustics and Performance Tool Chain Workshop, 12 - 23 July, 2021. |
| Boyd, D. D., "NASA Revolutionary Vertical Lift Technology Project Rotorcraft Noise and Performance Toolchain Workshops," NASA Acoustics Technical Working Group Meeting, Fall 2021, Virtual, 19 - 20 October, 2021. |
| Boyd, D. D., "Smart Twisting Active Rotor (STAR2): DE1 Working Notes/Discussion Guide," Smart Twisting Active Rotor (STAR2) Virtual Meeting, 29 - 30 November, 2021. |
| Boyd, D. D., "Smart Twisting Active Rotor (STAR2): U.S. Update," Smart Twisting Active Rotor (STAR2) Virtual Meeting, 25 - 26 May, 2021. NTRS |
| Boyd, D. D., Lopes, L. V., and Bain, J., "Subgroup 1: Tools & Technology," NASA Urban Air Mobility Noise Working Group Meeting, Fall 2021, Virtual, 21 October, 2021. |
| Boyd, D. D., Lopes, L. V., and Bain, J., "UAM Noise Working Group Meeting Subgroup 1: Tools & Technology," NASA Urban Air Mobility Noise Working Group Meeting, Spring 2021, Virtual, 15 April, 2021. NTRS |
| Boyle, D. K., Page., J., and Pascioni, K. A., "UAM Noise Working Group Meeting Subgroup 2: Ground & Flight Testing," NASA Urban Air Mobility Noise Working Group Meeting, Fall 2021, Virtual, 21 October, 2021. NTRS |
| Boyle, D. K., Page., J., and Pascioni, K. A., "UAM Noise Working Group Meeting Subgroup 2: Ground & Flight Testing," NASA Urban Air Mobility Noise Working Group Meeting, Spring 2021, Virtual, 15 April, 2021. NTRS |
| Brown, M. C., and Jones, M. G., "Evaluation of a Variable Facesheet Liner Configuration in Grazing Incidence for Broadband Noise Reduction," AIAA Paper 2021-2243, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |
| Clark, I. A., Thomas, R. H., and Guo, Y., "Aircraft System Noise of the NASA D8 Subsonic Transport Concept," Journal of Aircraft, Vol. 58, No. 5, pp. 1106 - 1120, September - October, 2021. DOI |
| Heath, S. L., and Cobb, E., "Progress toward an acoustic point to point ray tracing method in a stratified atmosphere with wind," 181st Meeting of the ASA, Seattle, Washington, 29 November - 3 December, 2021. DOI NTRS |
| Horne, W. C., Burnside, N. J., Schery, S. D., Podboy, G. G., Bahr, C. J., Stead, D. J., and Humphreys, W. M., "Effects of resistive windscreens and foam inserts on the acoustic response of an in-flow phased microphone array," AIAA Paper 2021-0217, AIAA Scitech 2021 Forum, Virtual, 11 - 15 & 19 - 21 January, 2021. DOI NTRS |
| Hutcheson, F. V., "14x22 Background Noise Reduction -Fun with Felt-," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. |
| Icke, R. O., Baysal, O., Lopes, L. V., and Diskin, B., "Optimizing Proprotor Blades Using Coupled Aeroacoustic and Aerodynamic Sensitivities," AIAA Paper 2021-3037, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |
| Krishnamurthy, S., Aumann, A. R., and Rizzi, S. A., "A Synthesis Plugin for Auralization of Rotor Self Noise," AIAA Paper 2021-2211, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |
| Krishnamurthy, S., Boucher, M. A., Christian, A. W., and Rizzi, S. A., "Rotorcraft Sound Quality Metric Test 1: Stimuli Generation and Supplemental Analyses," NASA/TM-20205008997, September, 2021. NTRS |
| Krishnamurthy, S., Rizzi, S. A., Cheng, R., Boyd, D. D., and Christian, A., "Prediction-Based Auralization of a Multirotor Urban Air Mobility Vehicle," AIAA Paper 2021-0587, AIAA Scitech 2021 Forum, Virtual, 11 - 15 & 19 - 21 January, 2021. DOI NTRS |
| Letica, S., and Alexander, W. N., "Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field," Journal of Aerospace Engineering, Vol. 34, Issue 4, Article 04021045, July, 2021. DOI |
| Li, J., Zheng, Y., Rafaelof, M., Ng, H., and Rizzi, S. A., "AIRNOISEUAM: An Urban Air Mobility Noise-Exposure Prediction Tool," 50th International Congress and Exposition on Noise Control Engineering (Inter-Noise 2021), Washington, D.C., 1 - 5 August, 2021. DOI NTRS |
| Lind, A. H., "Forces of Flight for a Lift+Cruise VTOL Aircraft," NASA STEM Stars, Virtual, 2021. NTRS |
| Lind, A. H., "What is Advanced Air Mobility (AAM)?," NASA STEM Stars, Virtual, 2021. NTRS |
| Litherland, B. L., Borer, N. K., and Zawodny, N. S., "X-57 `Maxwell' High-Lift Propeller Testing and Model Development," AIAA Paper 2021-3193, AIAA Aviation 2021 Forum, Virtual, 2 - 6 August, 2021. DOI NTRS |
| Lockard, D. P., Turner, T. L., Bahr, C. J., and Hutcheson, F. V., "Overview of Aeroacoustic Testing of the High-Lift Common Research Model," AIAA Paper 2021-2113, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |
| Lopes, L. V., "ANOPP2's Farassat Formulations Internal Functional Modules (AFFIFMs) Reference Manual - Version 1.4," NASA/TM-20210021111, December, 2021. NTRS |
| Lopes, L. V., "Plan and Progress on Experimental Validation of Computational Small Rotor Design Optimization Tools," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. NTRS |
| Lopes, L. V., "Subgroup 1: Tools & Technology," NASA Urban Air Mobility Noise Working Group Meeting, Spring 2021, Virtual, 15 April, 2021. NTRS |
| Pascioni, K. A., "Initial Overview of the National Campaign Acoustic Flight Test with Joby Aviation," NASA Acoustics Technical Working Group Meeting, Fall 2021, Virtual, 19 - 20 October, 2021. NTRS |
| Pascioni, K. A., Greenwood, E., Watts, M. E., Smith, C. D., and Stephenson, J. H., "Medium-Sized Helicopter Noise Abatement Flight Test Data Report," NASA/TM-20210011459, July, 2021. NTRS |
| Patterson, A., Hovakimyan, N., Pascioni, K. A., and Gregory, I., "Machine Learning Methods for Estimating Propeller Source Noise Spheres," AIAA Paper 2021-2177, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |
| Pettingill, N. A., "Acoustic and Performance Measurements Obtained in the NASA Langley Small Hover Anechoic Chamber," Penn State Vertical Flight Society Chapter Tech Talk, 29 April, 2021. NTRS |
| Pettingill, N. A., "NASA STEM Stars en Español," NASA STEM Stars, Virtual, 2021. NTRS |
| Pettingill, N. A., "What are UAVs, UAS and Drones?," NASA STEM Stars, Virtual, 2021. NTRS |
| Pettingill, N. A., Schiller, N. H., Zawodny, N. S., and Galles, M., "Initial Testing of 10" Ducted Propeller in Hover," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. NTRS |
| Pettingill, N. A., Zawodny, N. S., ahd Thurman, C. S., "Preliminary Results of UAS Quadcopter Aeroacoustic Testing," NASA Acoustics Technical Working Group Meeting, Fall 2021, Virtual, 19 - 20 October, 2021. NTRS |
| Pettingill, N. A., Zawodny, N. S., Thurman, C. S., and Lopes, L. V., "Acoustic and Performance Characteristics of an Ideally Twisted Rotor in Hover," AIAA Paper 2021-1928, AIAA Scitech 2021 Forum, Virtual, 11 - 15 & 19 - 21 January, 2021. DOI NTRS |
| Rizzi, S. A., "An Overview of the NASA Auralization Framework (NAF)," Advances in Noise Control Technology, A TQA Virtual Workshop, 19 - 20 October, 2021. NTRS |
| Rizzi, S. A., "Community noise assessment of urban air mobility vehicle operations using the FAA Aviation Environmental Design Tool," SAE A-21 Committee Meeting, Virtual, 16 - 17 November, 2021. |
| Rizzi, S. A., and Henderson, B. S., "Urban Air Mobility Noise Working Group (UNWG) Update (A Panel Session)," AEWG Aircraft Working Group, Virtual, 29 April, 2021. NTRS |
| Rizzi, S. A., and Huff, D. L., "Urban Air Mobility Noise: Current Practice, Gaps, and Recommendations," Oral Presentation, AIAA Scitech 2021 Forum, Virtual, 11 - 15 & 19 - 21 January, 2021. NTRS |
| Rizzi, S. A., and Rafaelof, M., "Community Noise Assessment of Urban Air Mobility Vehicle Operations using the FAA Aviation Environmental Design Tool," 50th International Congress and Exposition on Noise Control Engineering (Inter-Noise 2021), Washington, D.C., 1 - 5 August, 2021. DOI NTRS |
| Rizzi, S. A., Boyd, D. D., Lopes, L. V., and Pascioni, K. A., "Noise Sphere Guidance Document," SAE A-21 Committee Meeting, Virtual, 16 - 17 November, 2021. NTRS |
| Rizzi, S. A., Page, J. A., and Cheng, R., "Comparison of Two Community Noise Models Applied to a NASA Urban Air Mobility Concept Vehicle," 50th International Congress and Exposition on Noise Control Engineering (Inter-Noise 2021), Washington, D.C., 1 - 5 August, 2021. DOI NTRS |
| Stephenson, J. H., "Acoustic Signature Measurements and Modeling of sUAS Vehicles," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. |
| Stephenson, J. H., Schatzman, N. L., Cheung, B. K., Zawodny, N. S., Sargent, D. C., and Sim, B. W. C., "Aeroacoustic Measurements from the Aerodynamic and Acoustic Rotorprop Test (AART) in the National Full-Scale Aerodynamics Complex (NFAC) 40- by 80-Foot Wind Tunnel," VFS 77th Annual Forum, Virtual, 10 - 14 May, 2021. DOI NTRS |
| Szőke, M., Bahr, C. J., Cattafesta, L. N., Rossignol, K. S., Ura, H., Zhang, Y., and Zigunov, F., "Comparative Assessment of Sound Generated Using Laser-Induced Plasma," Presentation, Hybrid Anechoic Wind Tunnel Workshop, AIAA Aviation 2021 Forum, Virtual, 2 - 6 August, 2021. NTRS |
| Thurman, C. S., "Characterization of Blade Wake Interaction Noise for an Ideally Twisted Rotor," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. |
| Thurman, C. S., and Zawodny, N. S., "Aeroacoustic Characterization of Optimum Hovering Rotors using Artificial Neural Networks," VFS 77th Annual Forum, Virtual, 10 - 14 May, 2021. DOI NTRS |
| Thurman, C. S., Pettingill, N. A., and Zawodny, N. S., "Computational Study of Broadband Noise generated from an Optimum Hovering Rotor," UNWG Subgroup 1: Monthly Meeting, 7 December, 2021. NTRS |
| Thurman, C. S., Zawodny, N. S., Pettingill, N. A., Lopes, L. V., and Baeder, J. D., "Physics-informed Broadband Noise Source Identification and Prediction of an Ideally Twisted Rotor," AIAA Paper 2021-1925, AIAA Scitech 2021 Forum, Virtual, 11 - 15 & 19 - 21 January, 2021. DOI NTRS |
| Wang, L., Diskin, B., Lopes, L. V., Nielsen, E. J., Lee-Rausch, E., and Biedron, R. T., "High-Fidelity AeroAcoustic Optimization Tool for Flexible Rotors," Journal of the American Helicopter Society, Vol. 66, No. 2, April, 2021. DOI |
| Whiteside, S. K., Pollard, B. P., Antcliff, K. R., Zawodny, N. S., Fei, X., Silva, C., and Medina, G. L., "Design of a Tiltwing Concept Vehicle for Urban Air Mobility," NASA/TM-20210017971, June, 2021. NTRS |
| Zawodny, N. S., "Capabilities and Preliminary Checkout of a New Propeller Test Stand," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. NTRS |
| Zawodny, N. S., Boyd, D. D., and Nark, D. M., "Aerodynamic and Acoustic Interactions Associated with Inboard Propeller-Wing Configurations," AIAA Paper 2021-0714, AIAA Scitech 2021 Forum, Virtual, 11 - 15 & 19 - 21 January, 2021. DOI NTRS |
| Zawodny, N. S., Lind, A. H., and Blake, J., "Inflow Studies of Propeller-Wing Configurations," NASA Acoustics Technical Working Group Meeting, Spring 2021, Virtual, 13 - 14 April, 2021. NTRS |
| Zawodny, N. S., Pascioni, K. A., Heath, S. L., and Lind, A. H., "Preparations for the Vertical Lift Propeller Noise Tests in the 14x22," NASA Acoustics Technical Working Group Meeting, Fall 2021, Virtual, 19 - 20 October, 2021. |
| Zhang, Y., Richardson, R., Cattafesta, L. N., Choudhari, M. M., Pascioni, K. A., Khorrami, M. R., Lockard, D. P., and Turner, T., "Investigation of the 30P30N Slat Flow Field with Passive Control Devices Using Particle Image Velocimetry," AIAA Paper 2021-2116, AIAA Aviation 2021 Forum (27th AIAA/CEAS Aeroacoustics Conference), Virtual, 2 - 6 August, 2021. DOI NTRS |