2023
Sakib, M.S., Griffith, D.T., Hossain, M.S., Bayat, S., and Allison, J.T., “Intracycle RPM Control for Vertical Axis Wind Turbines,” Wind Energy, December 2023, DOI: https://doi.org/10.1002/we.2885.
Boo, S.Y., Shelley, S., Griffith, D.T., and Escalera Mendoza A., “Responses of a Modular Floating Wind TLP of MarsVAWT Supporting a 10 MW Vertical Axis Wind Turbine,” Wind 2023, 3(4): 513-544, DOI: https://doi.org/10.3390/wind3040029.
Escalera Mendoza, A.S., Griffith, D.T., Jeong, M., Qin, C., Loth, E., Phadnis, M., Pao, L., and Selig, M., “Aero-Structural Rapid Screening of New Design Concepts for Offshore Wind Turbines,” Renewable Energy, December 2023, DOI: https://doi.org/10.1016/j.renene.2023.119519.
Griffith, D.T., Cao, D., Lu, H., and Qian, D., “Composite materials in wind energy: design, manufacturing, operation, and end-of-life,” IOP Conference Series: Materials Science and Engineering, September 2023, DOI: 10.1088/1757-899X/1293/1/012002.
Ahsan, F. and Griffith, D.T., “Impact of Aerodynamic Modeling Assumptions on Flutter Speeds of Vertical Axis Wind Turbines,” AIAA Journal, September 2023, DOI: https://doi.org/10.2514/1.J062912.
Cao, D., Bouzolin, D., Lu, H., and Griffith, D.T., “Bending and shear improvements in 3D-printed core sandwich composites through modification of resin uptake in the skin/core interphase region,” Composites Part B: Engineering, July 2023, DOI: https://doi.org/10.1016/j.compositesb.2023.110912.
Kaminski, K., Simpson, J., Loth, E., Fingersh, L.J., Scholbrock, A., Johnson, N., Johnson, K., Pao, L., Griffith, D.T., “Gravo-aeroelastically-scaled demonstrator field tests to represent blade response of a flexible extreme-scale downwind turbine,” Renewable Energy, August 2023, DOI: https://doi.org/10.1016/j.renene.2023.119217.
Ahsan, F. and Griffith, D.T., “Evaluating the impact of simplified assumptions in aeroelastic stability predictions for horizontal axis wind turbines,” 2023 International Conference on Structural Dynamics Conference (EuroDyn), Delft, the Netherlands, July 2023.
Johnson, S., Chetan, M., Griffith, DT, and Sherwood, J., “A design-driven wind blade manufacturing model to identify opportunities to reduce wind blade costs,” Renewable Energy, June 2023, DOI: https://doi.org/10.1016/j.renene.2023.118945.
Chen, Y. and Griffith, D.T., “Blade mass imbalance identification and estimation for three-bladed wind turbine rotor based on modal analysis,” Mechanical Systems and Signal Processing, Volume 197, August 2023, 110341, DOI: https://doi.org/10.1016/j.ymssp.2023.110341.
SA Shelley, SY Boo, WH Luyties, DT Griffith, “How Texas Can Become the Leader in Offshore Wind in North and South America by Using New Technology and Leveraging Existing Infrastructure and Expertise,” 2023 Offshore Technology Conference, Houston, Texas, USA, May 2023, Paper Number: OTC-32282-MS, DOI: https://doi.org/10.4043/32282-MS.
Chen, Y., and Griffith, D.T., “Blade Mass Imbalance Identification and Estimation of Three-Bladed Wind Turbine Rotor Based on Modal Analysis,” 41st International Modal Analysis Conference (IMAC XLI), Austin, TX, February 13-16, 2023, Paper #14974.
Ahsan, F. and Griffith, D.T., “Impact of Relaxing Assumptions of Theodorsen’s Unsteady Aerodynamic Theory and Edgewise Aerodynamics on Flutter Prediction of Floating Vertical Axis Wind Turbines,” AIAA SCITECH 2023 Forum, 0590, DOI: https://doi.org/10.2514/6.2023-0590. View Video Presentation: https://doi.org/10.2514/6.2023-0590.vid
Escalera Mendoza, A, Mishra, I., and Griffith, D.T., “An Open-Source NuMAD Model for the IEA 15 MW Blade with Baseline Structural Analysis,” AIAA SCITECH 2023 Forum, 2093, DOI: https://doi.org/10.2514/6.2023-2093. View Video Presentation: https://doi.org/10.2514/6.2023-2093.vid
Harmjanz, J.F., Westergaard, T., and Griffith, D.T., “Assessment of Control Methods for Vertical Axis Wind Turbines: Start-up, Operational, and Overspeed Control,” AIAA SCITECH 2023 Forum, 0612, DOI: https://doi.org/10.2514/6.2023-0612. View Video Presentation: https://doi.org/10.2514/6.2023-0612.vid
2022
Renan dos Santos, C., Abdelmoteleb, S., Escalera Mendoza A., Bachynski-Polic, E., Griffith D.T., and Oggiano, L., “Application of a PI-controller to a 25 MW Floating Wind Turbine,” 61st IEEE Conference on Decision and Control – Dec. 6-9, 2022, in Cancún, Mexico.
Chen, Y. and Griffith, D.T., “Experimental and Numerical Full-Field Displacement and Strain Characterization of Wind Turbine Blade using a 3D Scanning Laser Doppler Vibrometer,” Optics and Laser Technology, October 2022 (accepted), DOI: https://doi.org/10.1016/j.optlastec.2022.108869.
Kianbakht, S., Martin, D., Johnson, K., Zalkind, D., Pao, L., Loth, E., Simpson, J., Chetan, M., Yao, S., and Griffith, D.T., “Design Space Exploration and Decision Making for a Segmented Ultralight Morphing 50 MW Wind Turbine,” Wind Energy, August 2022, DOI: https://doi.org/10.1002/we.2781.
Chetan, M., Yao, S., and Griffith, D.T., “Flutter Behavior of Highly Flexible Blades for Two- and Three-bladed Wind Turbines,” Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2021-132, August 2022.
Chen, Y., Escalera Mendoza, A.S., and Griffith, D.T., “Experimental Dynamic Characterization of Both Surfaces of Structures using 3D Scanning Laser Doppler Vibrometer,” Experimental Techniques, August 2022, DOI: https://doi.org/10.1007/s40799-022-00604-2.
Jafari, M., Sakib, M.S., Griffith, D.T., Brownstein, I., Strom, B., and Cooney, J., “Wind Tunnel Experiment to Study Aerodynamics and Control of H-Rotor Vertical Axis Wind Turbine,” Journal of Physics: Conference Series 2265 (2), 022084.
Escalera Mendoza, A.S., Griffith, D.T., Qin, C., Loth, E., and Johnson, N., “Rapid approach for structural design of the tower and monopile for a series of 25 MW offshore turbines,” Journal of Physics: Conference Series 2265 (032030).
Loth, E., Ananda, G., Chetan, M., Damiani, R., Griffith, D.T., Johnson, K., Kianbakht, S., Kaminski, M., Pao, L., Phadnis, M., Qin, C., Scholbrock, A., Selig, M., Simpson, J., Yao, S., “Field tests of a highly flexible downwind ultralight rotor to mimic a 13-MW turbine rotor,” Journal of Physics: Conference Series 2265 (3), 032031.
Qin, C., Loth, E., Zalkind, D., Pao, L., Yao, S., Griffith, D.T., Selig, M., and Damiani, R., “Active rotor coning for a 25 MW downwind offshore wind turbine,” Journal of Physics: Conference Series 2265 (3), 032022.
Gupta, A., Rotea, M., Chetan, M., Sakib, M.S., and Griffith, D.T., “Effect of wind turbine size on load reduction with active flow control,” Journal of Physics: Conference Series 2265 (3), 032093.
Lao, Y., Rotea, M., Koeln, J., Sakib, M.S., and Griffith, D.T., “Economic Nonlinear Model Predictive Control of Offshore Vertical-Axis Wind Turbines,” American Controls Conference (ACC) 2022, June 2022, Atlanta, Georgia, USA.
Gao, J., Griffith, D.T., Jafari, M., Yao, S., and Ahsan, F., “Impact of Rotor Solidity on the Design Optimization of Floating Vertical Axis Wind Turbines,” Proceedings of the ASME 2022 41st International Conference on Ocean, Offshore and Artic Engineering (OMAE 2022), June 5-10, 2022, Hamburg, Germany.
Jafari, M., Sakib, M.S., and Griffith, D.T., “Impact of Combining Intracycle RPM Control and Solidity to Increase Power Production of Floating Vertical Axis Wind Turbines,” Proceedings of the ASME 2022 41st International Conference on Ocean, Offshore and Artic Engineering (OMAE 2022), June 5-10, 2022, Hamburg, Germany.
Abdelmoteleb, S., Escalera Mendoza A., Renan dos Santos, C., Bachynski-Polic, E., Griffith D.T., and Oggiano, L. “Preliminary Sizing and Optimization of Semisubmersible Substructures for Future Generation Offshore Wind Turbines,” DeepWind 2022 Conference, Trondheim, Norway, January 2022.
Chen, Y. and Griffith, D.T., “Experimental and Numerical Investigation of the 3D Structural Dynamic Characteristics for Both Surfaces of a Wind Turbine Blade,” Journal of Vibration and Control, May 2022, DOI: https://doi.org/10.1177/10775463221097470.
Sakib, M.S. and Griffith, D.T., “Parked and operating load analysis in the aerodynamic design of multi-megawatt-scale floating vertical-axis wind turbines,” Wind Energy Science, 7 (2), 677-696, March 2022, DOI: https://doi.org/10.5194/wes-7-677-2022, 2022.
Johnson, S, Chetan, M., Griffith, D.T., and Sherwood, J., “Development of High-Fidelity Design-Driven Wind Blade Manufacturing Process Models to Investigate Labor Predictions in Wind Blade Manufacture,” Wind Energy, May 2022, DOI: https://doi.org/10.1002/we.2731.
Chen, Y., Griffith, D.T., “Finite Cross-Section Method (FCSM) for Mode Shape Recognition of Highly Coupled Beam-Type Structures,” Journal of Vibration and Acoustics, March 2022, DOI:https://doi.org/10.1115/1.4053977.
Chen, Y., Escalera Mendoza A.S., and Griffith, D.T., “Experimental and Numerical Full-field Displacement and Strain Characterization of Wind Turbine Blade using a 3D Scanning Laser Doppler Vibrometer,” 40th International Modal Analysis Conference (IMAC XL), Orlando, FL, February 7-10, 2022, Paper #12567.
Chen, Y., Escalera Mendoza A.S., and Griffith, D.T., “Experimental Dynamic Characterization of Both Surfaces of a Wind Turbine Blade using 3D Scanning Laser Doppler Vibrometer,” 40th International Modal Analysis Conference (IMAC XL), Orlando, FL, February 7-10, 2022, Paper #12569.
Chen, Y., and Griffith, D.T., “Finite Cross-Section Method (FCSM) for Mode Shape Recognition of Highly Coupled Beam-Type Structures,” 40th International Modal Analysis Conference (IMAC XL), Orlando, FL, February 7-10, 2022, Paper #12570.
Chen, Y., and Griffith, D.T., “Predicting Dynamic Response of Three-dimensional Structures at Unmeasured Locations Based on Polynomial Shape Functions,” 40th International Modal Analysis Conference (IMAC XL), Orlando, FL, February 7-10, 2022, Paper #12571.
Haus, L., Griffith, D.T., Coe, R., and Bacelli, G., “Development and Characterization of a Coupled Structural Dynamics Model for the Sandia Wave Energy Converter Testbed,” Journal of Ocean Engineering and Marine Energy, January 2022, https://doi.org/10.1007/s40722-021-00220-z.
Escalera Mendoza, A.S., Yao, S., Chetan, M., and Griffith, D.T., “Design and Analysis of a Segmented Blade for a 50 MW Wind Turbine Rotor,” Wind Engineering, January 2022, https://doi.org/10.1177/0309524X211069393.
Ahmed, W., Panthi, K., Iungo, G.V., Griffith, D.T., Rotea, M., Cooney, J., Szlatenyi, C., Janik, A., Mickelson, P., and Fine, N., “Wind-tunnel Force-measurements of Gurney Flaps for Active Control of Wind Turbine Blades,” AIAA SCITECH 2022, AIAA 2022-2294, January 2022, San Diego, CA, USA, https://doi.org/10.2514/6.2022-2294.
2021
Ahsan, F., Griffith, D.T., and Gao, J., “Modal dynamics and flutter analysis of floating offshore vertical axis wind turbines,” Renewable Energy, December 2021, https://doi.org/10.1016/j.renene.2021.12.041.
Chen, Y., Griffith, D.T., “Mode Shape Recognition of Complicated Spatial Beam-Type Structures via Polynomial Shape Function Correlation,” Experimental Techniques, November 2021, DOI:https://doi.org/10.1007/s40799-021-00505-w.
Chetan, M., Sakib, M.S., Griffith, D.T., Gupta, A., and Rotea, M.A., “Design of a 3.4MW Wind Turbine with Integrated Plasma Actuator-based Load Control” Wind Energy, September 2021, DOI: 10.1002/we.2684.
Gao, J., Griffith, D.T., Sakib, M.S., and Boo, S.Y., “A Semi-coupled Aero-servo-hydro Numerical Model for Floating Vertical Axis Wind Turbines Operating on TLPs,” Renewable Energy, September 2021, https://doi.org/10.1016/j.renene.2021.09.076.
Yao, S., Chetan, M., Griffith, D.T., Escalera Mendoza, A.S., Selig, M., Martin, D., Kianbakht, S., Johnson, K., and Loth, E., “Aero-Structural Design and Optimization of 50 MW Wind Turbine with over 250-meter Blades,” Wind Engineering, July 2021, https://doi.org/10.1177/0309524X211027355.
Gupta, A., Rotea, M.A., Chetan, M., Sakib M.S., Griffith, D.T., “A Methodology for Robust Load Reduction in Wind Turbine Blades Using Flow Control Devices,” Energies, 2021, 14, 3500, https://doi.org/10.3390/en14123500.
Cao, D., Malakooti, S., Kulkarni, V.N., Ren, Y., Liu, Y., Nie, X., Qian, D., Griffith, D.T., and Lu, H., “The Effect of Resin Uptake on the Flexural Properties of Compression Molded Sandwich Composites,” Wind Energy, July 2021, https://doi.org/10.1002/we.2661.
Y. Chen, Escalera Mendoza, A., and Griffith, D.T., “Experimental and numerical study of high-order complex curvature mode shape and mode coupling on a three-bladed wind turbine assembly,” Mechanical Systems and Signal Processing, Volume 160, November 2021, https://doi.org/10.1016/j.ymssp.2021.107873.
Chetan, M., Yao, S., and Griffith, D.T., “Multi-fidelity Digital Twin Structural Model for a Sub-scale Downwind Wind Turbine Rotor,” Wind Energy, May 2021, https://doi.org/10.1002/we.2636.
L. Pao, Zalkind, D., Griffith, D.T., Chetan, M., Selig, M., Ananda, G., Bay, C., Stehly, T., and Loth, E., “Control co-design of 13 MW downwind two-bladed rotors to achieve 25% reduction in levelized cost of wind energy,” Annual Reviews in Control, March 2021, https://doi.org/10.1016/j.arcontrol.2021.02.001.
Y. Chen, Escalera Mendoza, A., and Griffith, D.T., “Experimental and Analytical Study of High-order Complex Curvature Mode Shape and Mode Coupling on a Three-Bladed Wind Turbine Assembly,” In Proceedings of the 39th International Modal Analysis Conference, 2021.
Yao, S., Chetan, M., and Griffith, D.T., “Structural Design and Optimization of a Series of 13.2MW Downwind Rotors,” Wind Engineering, available online January 2021, https://doi.org/10.1177/0309524X20984164.
Escalera Mendoza, A., Chetan, M., and Griffith, D.T., “Quantification of Extreme-scale Wind Turbine Performance Parameters due to Variations in Beam Properties,” AIAA SCITECH 2021 FORUM, AIAA-2021-1603, https://doi.org/10.2514/6.2021-1603.
2020
Griffith, D.T., Fine, N., Cooney, J., Rotea, M., and Iungo, G.V., “Active Aerodynamic Load Control for Improved Wind Turbine Design,” Journal of Physics: Conference Series 1618 (2020) 052079, DOI: doi:10.1088/1742-6596/1618/5/052079.
De Tavernier, D., M. Sakib, D.T. Griffith, G. Pirrung, U. Paulsen, H. Madsen, W. Keijer and C. Ferreira, “Comparison of 3D Aerodynamic Models for Vertical-axis Wind Turbines: H-rotor and Φ-rotor,” Journal of Physics: Conference Series 1618 (2020) 052041, DOI: doi:10.1088/1742-6596/1618/5/052041.
Kaminski, M., Noyes, C., Loth, E., Damiani, R., Hughes, S., Bay, C., Chetan, M., Griffith, D.T., Johnson, K., Martin, D., “Gravo‐aeroelastic scaling of a 13‐MW downwind rotor for 20% scale blades,” Wind Energy, September 2020, https://doi.org/10.1002/we.2569.
Qin, C., Loth, E., Zalkind, D., Pao, L., Yao, S., Griffith, D.T., Selig, M., and Damiani, R., “Downwind coning concept rotor for a 25 MW offshore wind turbine,” Renewable Energy, 2020, https://doi.org/10.1016/j.renene.2020.04.039.
Yao, S., Griffith, D.T., Chetan, M., Bay, C., Damiani, R., Kaminski, M., and Loth, E., “A gravo-aeroelastically scaled wind turbine rotor at field-prototype scale with strict structural requirements,” Renewable Energy, 2020, https://doi.org/10.1016/j.renene.2020.03.157.
Sakib, M.S., Chetan, M., and Griffith, D.T., “Aero-Structural Design Optimization of a 3.4 MW Wind Turbine Using Plasma Actuator Based Load Control,” AIAA AVIATION 2020 FORUM, AIAA-2020-3148, https://doi.org/10.2514/6.2020-3148.
Escalera Mendoza, A.S. and Griffith, D.T., “Determination of Aero-elastic Properties of Swept and Pre-bend Wind Turbine Blades,” Proceedings of the International Modal Analysis Conference, February 10-13, 2020, Houston, TX, US, Paper #8284.
2019
Kaminski, M., Loth, E., Griffith D.T., and Qin, Chao (Chris), “Ground testing of a 1% gravo-aeroelastically scaled additively-manufactured wind turbine blade with bio-inspired structural design,” Renewable Energy, 2019, https://doi.org/10.1016/j.renene.2019.10.152.
Schmidt-Paulsen, U., Anderson, E., D.T. Griffith, and Madsen, H.A., “A Review of State-of-the-art in Torque Generation and Control of Floating Vertical-axis Wind Turbines,” AIP Conference Proceedings 2123, 030021 (2019); https://doi.org/10.1063/1.5117052.
Chetan, M., Mohammad S. Sakib, and D.T. Griffith, “Aero-Structural Design Study of Extreme-Scale Segmented Ultralight Morphing Rotor Blades,” AIAA AVIATION 2019 Forum, AIAA 2019-3347, https://doi.org/10.2514/6.2019-3347.
Zalkind, D., Ananda, G., Chetan, M., Martin, D., Bay, C., Johnson, K., Loth, E., Griffith, D.T., Selig, M., and Pao, L., “System-level Design Studies for Large Rotors,” Wind Energy Science, 2019, https://doi.org/10.5194/wes-2018-80.
Griffith, D.T., Chetan, M., and Yao, S., “Dynamics of Extreme-scale Wind Turbines,” Proceedings of the International Modal Analysis Conference, January 28-31, 2019, Orlando, FL, US, Paper #5703.
Chetan, M., Griffith, D.T., and Yao, S., “Flutter Predictions in the Design of Extreme-Scale Segmented Ultralight Morphing Rotor Blades”, AIAA Scitech 2019 Forum, AIAA 2019-1298, doi.org/10.2514/6.2019-1298.
Yao, S., Griffith, D.T., Chetan, M., Bay, C., Damiani, R., Kaminski, M., and Loth, E., “Structural Design of a 1/5th Scale Gravo-Aeroelastically Scaled Wind Turbine Demonstrator Blade for Field Testing”, AIAA Scitech 2019 Forum, AIAA 2019-1067, doi.org/10.2514/6.2019-1067.
Bay, C., Damiani, R., Fingersh, L., Hughes, S., Chetan, M., Yao, S., Griffith, D.T., Ananda, G., Selig, M., Zalkind, D., Pao, L., Martin, D., Johnson, K., Kaminski, M., and Loth, E., “Design and Testing of a Scaled Demonstrator Turbine at the National Wind Technology Center”, AIAA Scitech 2019 Forum, AIAA 2019-1068, doi.org/10.2514/6.2019-1068.
2018
Ennis, B. and Griffith, D.T., “System Levelized Cost of Energy Analysis for Floating Offshore Vertical-Axis Wind Turbines,” Sandia National Laboratories Technical Report, SAND2018-9131, doi:10.2172/1466530.
Searcy, C., Perryman, S., Maniar, D., Griffith, D. T., and Ennis, B., “Optimal Floating Vertical-Axis Wind Turbine Platform Identification Design and Cost Estimation,” Sandia National Laboratories Technical Report, SAND2018-9085, doi:10.2172/1466529.
Griffith, D.T. and Chetan, M., “Assessment of Flutter Prediction and Trends in the Design of Large-scale Wind Turbine Rotor Blades,” Journal of Physics: Conference Series 1037 (2018) 042008, DOI: 10.1088/1742-6596/1037/4/042008.
Griffith, D.T., Barone, M., Paquette, J., Owens, B., Bull, D., Simao-Ferriera, C., Goupee, A., and Fowler, M., “Design Studies for Deep-Water Floating Offshore Vertical Axis Wind Turbines,” Sandia National Laboratories Technical Report, SAND2018-7002, doi:10.2172/1459118.
Liu, J., Thomas, E., Manuel, L., Griffith, D.T., Ruehl, K.M., Barone, M, “Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform,” J. Mar. Sci. Eng. 2018, 6, 9, DOI:10.3390/jmse6010009.
Kaminski, M., Loth, E., Qin, C., and Griffith, D.T., “Gravo-Aeroelastic Scaling a 13.2 MW Wind Turbine Blade to a 1-meter Model”, 2018 Wind Energy Symposium, AIAA SciTech Forum, (AIAA 2018-1731), DOI: https://doi.org/10.2514/6.2018-1731.
2017
Loth, E., Fingersh L., Griffith, D.T., Kaminski, M., and Qin, C., “Gravo-Aeroelastically Scaling for Extreme-Scale Wind Turbines”, 35th AIAA Applied Aerodynamics Conference, AIAA AVIATION Forum, (AIAA 2017-4215), DOI: https://doi.org/10.2514/6.2017-4215.
Richards, P.W., Griffith, D.T., and Hodges, D., “Aeroelastic Design of Large Wind Turbine Blades Considering Damage Tolerance,” Wind Energy, Wiley, Volume 20, Issue 1, January 2017, Pages 159–170, DOI: 10.1002/we.1997.
2016
Patterson, R.P., Griffith, D.T., “Wind Loading Effects on Photovoltaic Solar Trackers: Structural Modeling and Aeroelastic Stability Analysis,” Sandia National Laboratories Technical Report, SAND2016-12958, December 2016 (Official Use Only).
Anderson, E., Schmidt-Paulsen, U., D.T. Griffith, Madsen, H.A., “A Review of State-of-the-art in Torque Generation and Control of Floating Vertical-axis Wind Turbines,” EUROMECH Colloquium on Scientific and Technological Challenges in Offshore Vertical Axis Wind Turbines, Delft, the Netherlands, September 7-9, 2016.
Griffith, D.T., Paquette, J., Barone, M., Goupee, A., Fowler, M., Bull, D., Owens, B., “A Study of Rotor and Platform Design Trade-offs for Large-scale Floating Vertical Axis Wind Turbines,” Journal of Physics: Conference Series 753 (2016) 102003 doi:10.1088/1742-6596/753/10/102003.
Liu, J., Thomas, E., Manuel, L., Griffith, D.T., Ruehl, K., and Barone, M., “On the Development of a Semi-Submersible Offshore Floating Platform and Mooring System for a 13.2 MW Wind Turbine,” 34th ASME Wind Energy Symposium, January 2016, San Diego, CA, USA, Paper Number AIAA2016-1994.
2015
Richards, P., Griffith, D.T., and Hodges, D., “Smart Loads Management for Damaged Offshore Wind Turbines,” Wind Engineering, Vol. 39, No. 4, August 2015, pp 419-436, DOI: http://dx.doi.org/10.1260/0309-524X.39.4.419.
Griffith, D.T., “Structural Health and Prognostics Management for Offshore Wind Plants: Final Report of Sandia R&D Activities,” Sandia National Laboratories Technical Report, SAND2015-2593, March 2015.
Myrent, N, Adams, D., Griffith, D.T., “Wind Turbine Blade Shear Web Disbond Detection Using Rotor Blade Operational Sensing and Data Analysis,” Philosophical Transactions of the Royal Society A, January 2015.
Roscher, B., Simao Ferreira, C., Bernhammer, L., Madsen, H., Griffith, D.T., Stoevesandt, B., “Combined Structural Optimization and Aeroelastic Analysis of a Vertical Axis Wind Turbine,” 33rd ASME Wind Energy Symposium, January 2015, Orlando, FL.
2014
Griffith, D. T., Moya, A.C., Ho, C.K., and Hunter, P.S., “Structural Dynamics Testing and Analysis for Design Evaluation and Monitoring of Heliostats,” ASME Journal of Solar Energy Engineering, 137(2), Oct 23, 2014, doi: 10.1115/1.4028561.
Myrent, N.J., Adams, D.E., and Griffith, D.T., “Wind Turbine Blade Shear Web Disbond Detection Using Rotor Blade Operational Sensing and Data Analysis,” International Conference on Next Generation Wind Energy (ICNGWE 2014), Madrid, Spain, October 7-10, 2014.
Griffith, D.T. and Richards, P.W., “The SNL100-03 Blade: Design Studies with Flatback Airfoils for the Sandia 100-meter Blade,” Sandia National Laboratories Technical Report, September 2014, SAND2014-18129.
Myrent, N.J, Barrett, N.C., Adams, D.E., and Griffith, D.T., “Structural Health and Prognostics Management of Offshore Wind Turbines: Sensitivity Analysis of Rotor Fault and Blade Damage with O&M Cost Modeling,” Sandia National Laboratories Technical Report, July 2014, SAND2014-15588.
Fowler, M.J., Owens, B.C., Goupee, A.J., Hurtado, J.E., Griffith, D.T., Alves, M., “Hydrodynamic Module Coupling in the Offshore Wind Energy Simulation (OWENS) Toolkit,” Proceedings of the 33rd ASME International Conference on Ocean, Offshore and Arctic Engineering (OMAE2014), June 8-13, 2014, San Francisco, California, USA, Paper OMAE2014-24175. Best Paper Award OMAE 2014 Ocean Renewable Energy Symposium.
Owens, B.C. and Griffith, D.T., “Aeroelastic Stability Investigations for Large-scale Vertical Axis Wind Turbines,” Journal of Physics: Conference Series, Volume 524, No. 1, June 2014.
Richards, P.W., Griffith, D.T., and Hodges, D.H., “High-fidelity Modeling of Local Effects of Damage for Derated Offshore Wind Turbines,” Journal of Physics: Conference Series, Volume 524, No. 1., June 2014.
Richards, P.W., Griffith, D.T., and Hodges, D.H., “Operating Strategies and Design Recommendations for Mitigating Local Damage Effects in Offshore Turbine Blades,” American Helicopter Society (AHS) 70th Annual Forum, Montreal, Quebec, Canada, May 20-22, 2014.
Griffith, D.T. and Richards, P.W., “Investigating the Effects of Flatback Airfoils and Blade Slenderness on the Design of Large Wind Turbine Blades,” Proceedings of the European Wind Energy Association (EWEA) Annual Event, Barcelona, Spain, March 10-13, 2014, Paper PO-225.
Kusnick, J., Adams, D., and Griffith, D.T., “Wind Turbine Rotor Imbalance Detection Using Nacelle and Blade Measurements,” Wind Energy, Wiley, January 2014, DOI: 10.1002/we.1696.
Owens, B.C., Griffith, D.T., and Hurtado, J.E., “Modal Dynamics and Stability of Large Multi-megawatt Deepwater Offshore Vertical-axis Wind Turbines: Initial Support Structure and Rotor Design Impact Studies,” 32nd ASME Wind Energy Symposium (AIAA SCITECH), January 13-17, 2014, National Harbor, MD, USA.
Buckney, N., Pirrera, A., Weaver, P., and Griffith, D.T., “Structural Efficiency Analysis of the Sandia 100 m Wind Turbine Blade,” 32nd ASME Wind Energy Symposium (AIAA SCITECH), January 13-17, 2014, National Harbor, MD, USA.
Myrent, N., Bilal, N., Adams, D., and Griffith, D.T., “Aerodynamic Sensitivity Analysis of Rotor Imbalance and Shear Web Disbond Detection Strategies for Offshore Structural Health Prognostics Management of Wind Turbine Blades,“ 32nd ASME Wind Energy Symposium (AIAA SCITECH), January 13-17, 2014, National Harbor, MD, USA.
2013
Griffith, D.T., “The SNL100-02 Blade: Advanced Core Material Design Studies for the Sandia 100-meter Blade,” Sandia National Laboratories Technical Report, November 2013, SAND2013-10162.
Griffith, D.T., Yoder, N.C., Resor, B.R., White, J.R., and Paquette, J.A., “Structural Health and Prognostics Management for the Enhancement of Offshore Wind Turbine Operations and Maintenance Strategies,” Wind Energy, Wiley, September 2013, DOE:10.1002/we.1665.
Owens, B.C., Griffith, D.T., Resor, B.R., and Hurtado, J.E., “Impact of Modeling Approach on Flutter Predictions for Very Large Wind Turbine Blade Designs,” Proceedings of the American Helicopter Society (AHS) 69th Annual Forum, May 21-23, 2013, Phoenix, AZ, USA, Paper No. 386.
Myrent, N.J., Kusnick, J.F., Adams, D.E., and Griffith, D.T., “Pitch Error and Shear Web Disbond Detection on Wind Turbine Blades for Offshore Structural Health and Prognostics Management,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 8-11, 2013, Boston, MA, USA, AIAA-2013-1695.
Griffith, D.T. and Johanns, W., “Carbon Design Studies for Large Blades: Performance and Cost Tradeoffs for the Sandia 100-meter Wind Turbine Blade,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 8-11, 2013, Boston, MA, USA, AIAA-2013-1554.
Owens, B.C., Hurtado, J.E., Paquette, J., Griffith, D.T., and Barone, M., “Aeroelastic Modeling of Large Offshore Vertical-axis Wind Turbines: Development of the Offshore Wind Energy Simulation Toolkit,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 8-11, 2013, Boston, MA, USA, AIAA-2013-1552.
Myrent, N., Kusnick, J., Barrett, N., Adams, D., and Griffith, D.T., “Structural Health and Prognostics Management for Offshore Wind Turbines: Case Studies of Rotor Fault and Blade Damage with Initial O&M Cost Modeling,” Sandia National Laboratories Technical Report, April 2013, SAND2013-2735.
Griffith, D.T. and Johanns, W., “Large Blade Manufacturing Cost Studies Using the Sandia Blade Manufacturing Cost Tool and Sandia 100-meter Blades,” Sandia National Laboratories Technical Report, April 2013, SAND2013-2734.
Johanns, W. and Griffith, D.T., “User Manual for Sandia Blade Manufacturing Cost Tool: Version 1.0,” Sandia National Laboratories Technical Report, April 2013, SAND2013-2733.
Moya, A., Ho, C., Sment, J., Griffith, D.T., Christian, J., and Allen, M.S., “Modal Analysis and Dynamic Monitoring of a Concentrating Solar Heliostat,” Proceedings of the 31st International Modal Analysis Conference, February 11-14, 2013, Garden Grove, CA, USA.
Griffith, D.T., “The SNL100-01 Blade: Carbon Design Studies for the Sandia 100-meter Blade,” Sandia National Laboratories Technical Report, February 2013, SAND2013-1178.
2012
Griffith, D.T., Yoder, N.C., Resor, B.R., White, J.R., and Paquette, J.A., “Structural Health and Prognostics Management for Offshore Wind Turbines: An Initial Roadmap,” Sandia National Laboratories Technical Report, December 2012, SAND2012-10109.
Ho, C., Griffith, D.T., Sment, J., Moya, A.C., Christian, J.M., Yuan, J.K., and Hunter, P.S., “Dynamic Testing and Analysis of Heliostats to Evaluate Impacts of Wind on Optical Performance and Structural Fatigue,” Proceedings of Solar Power and Chemical Energy Systems (SolarPACES) 2012 Conference, Marrakech, Morocco, September 11-14, 2012.
Griffith, D.T., Resor, B.R., and Ashwill, T.D., “Challenges and Opportunities in Large Offshore Rotor Development: Sandia 100-meter Blade Research,” Proceedings of the American Wind Energy Conference WINDPOWER 2012 Conference and Exhibit (Scientific Track), June 3-6, 2012, Atlanta, GA, USA.
Menicucci, A.R., Ho, C.K., and Griffith, D.T., “High Performance Computing for Static and Dynamic Analyses of Heliostats for Concentrating Solar Power,” Proceedings of the World Renewable Energy Forum (WREF 2012), May 13-17, 2012, Denver, CO, USA, pp. 645-651.
Corson, D.A., Griffith, D.T., Ashwill, T.D., and Shakib, F., “Investigating Aeroelastic Performance of Multi-MegaWatt Wind Turbine Rotors Using CFD,“ 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 23-26, 2012, Honolulu, HI, USA, AIAA-2012-1827.
Miller, D., Mandell, J.F., Samborsky, D., Hernandez-Sanchez, B.A., and Griffith, D.T., “Performance of Composite Materials Subjected to Salt Water Environments,“ 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 23-26, 2012, Honolulu, HI, USA, AIAA-2012-1575.
Griffith, D.T., Ashwill, T.D., and Resor, B.R., “Large Offshore Rotor Development: Design and Analysis of the Sandia 100-meter Wind Turbine Blade,“ 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 23-26, 2012, Honolulu, HI, USA, AIAA-2012-1499.
Resor, B.R., Owens, B.C., and Griffith, D.T., “Aeroelastic Instability of Very Large Wind Turbine Blades,” Proceedings of the European Wind Energy Conference Annual Event (Technical Track Paper/Poster), April 16-19, 2012, Copenhagen, Denmark.
Griffith, D.T., Yoder, N., Resor, B.R., White, J., Paquette, J., Ogilvie, A., and Peters, V., “Prognostic Control to Enhance Offshore Wind Turbine Operations and Maintenance Strategies,” Proceedings of the European Wind Energy Conference Annual Event (Scientific Track), April 16-19, 2012, Copenhagen, Denmark.
Griffith, D.T., Ho, C., Hunter, P.S., Sment, J., Moya, A.C., Menicucci, A.R., “Modal Analysis of a Heliostat for Concentrating Solar Power” Proceedings of the 30th International Modal Analysis Conference, January 30 – February 2, 2012, Jacksonville, FL, USA.
2011
Barone, M., Griffith, D.T., and Berg, J., “Reference Model 2: ‘Rev 0’ Rotor Design,” Sandia National Laboratories Technical Report, November 2011, SAND2011-9306.
Griffith, D.T., Moya, A.C., Ho, C.K., and Hunter, P.S., “Structural Dynamics Testing and Analysis for Design Evaluation and Monitoring of Heliostats,” ASME Energy Sustainability Conference and Fuel Cell Conference, August 7-10, 2011, Washington, Washington DC.
Griffith, D.T. and Ashwill, T.D, “The Sandia 100-meter All-glass Baseline Wind Turbine Blade: SNL100-00,” Sandia National Laboratories Technical Report, June 2011, SAND2011-3779.
Griffith, D.T., “Utilization of Localized Panel Resonant Behavior in Wind Turbine Blades,” Proceedings of the 29th International Modal Analysis Conference, January 31 – February 3, 2011, Jacksonville, FL, USA.
2010
Griffith, D.T., “Analytical Sensitivities of Principal Components in Time Series Analysis of Dynamical Systems,” AIAA Journal, Vol. 48, No. 9 September 2010, pgs. 2099-2110.
Griffith, D.T. and Paquette, J.A., “Panel Resonant Behavior of Wind Turbine Blades,” 51th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Presented in Special Session titled “Wind Turbine Dynamics and Control,” April 1-4, 2010, Orlando, FL, USA, AIAA-2010-2741.
Griffith, D.T., Carne, T.G., and Paquette, J.A., “Experimental Modal Analysis for 9-meter Research-sized Wind Turbine Blades,” Proceedings of the 28th International Modal Analysis Conference, February 1-4, 2010, Jacksonville, FL, USA.
Griffith, D.T., Mayes, R.L., and Hunter, P.S., “Excitation Methods for a 60 kW Vertical Axis Wind Turbine,” Proceedings of the 28th International Modal Analysis Conference, February 1-4, 2010, Jacksonville, FL, USA.
Piekos, E.S., Dyhkuizen, R.C., Griffith, D.T., Gwinn, K.W., Hogan, R.E., Romero, V.J., and Aselage, T.L., “Technologies for Concentrating Solar Power,” Sandia National Laboratories Technical Report, February 2010, SAND2010-0885.
2009
Griffith, D.T., “Using Principal Components Analytical Sensitivities for Calibration of Linear and Nonlinear Structural Dynamics Models,” Internal Memo, Sandia National Laboratories, November 30, 2009.
Griffith, D.T., Hunter, P.S., Kelton, D.W., Carne, T.G., and Paquette, J.A., “Boundary Condition Considerations for Validation of Blade Structural Models,” Proceedings of the Society for Experimental Mechanics (SEM) Annual Conference and Exhibition, June 1-3, 2009, Albuquerque, NM, USA.
Griffith, D.T. and Miller, A.K., “Applications of Analytical Sensitivities of the Principal Components in Structural Dynamics Analysis,” 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, May 4-7, 2009, Palms Springs, CA, USA, AIAA-2009-2650.
Walter, M., Garcia, E., Miller, A.K., and Griffith, D.T., “Identification of Structural Nonlinear Behavior Using Singular Value Methods,” 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, May 4-7, 2009, Palms Springs, CA, USA, AIAA-2009-2494.
Griffith, D.T., “Structural Dynamics Analysis and Model Validation of Wind Turbine Structures,” 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Presented in Special Session on “Wind Energy Technology”, May 4-7, 2009, Palms Springs, CA, USA, AIAA-2009-2408.
Griffith, D.T., “Analytical Sensitivities for Principal Components Analysis of Dynamical Systems,” Proceedings of the 27th International Modal Analysis Conference, February 2009, Orlando, FL, USA.
2008
Griffith, D.T., Carne, T.G., and Paquette, J.A., “Modal Testing for Validation of Blade Models,” Wind Engineering, Vol. 32, No. 2, 2008, pgs. 91-102.
Griffith, D.T., Paquette, J.A., and Carne, T.G., “Development of Validated Blade Structural Models,” 46th AIAA Aerospace Sciences Meeting and Exhibit, 7-10 January 2008, Reno, NV, USA, AIAA 2008-1297.
Griffith, D.T. and Carne, T.G., “Modal Testing of the BSDS Wind Turbine Blade,” Sandia National Laboratories Technical Report, in preparation.
2007
Sovinsky, M.C., Hurtado, J.E., Griffith, D.T., and Turner, J.D., “The Hamel Representation: A Diagonalized Poincare Form,” Journal of Computational and Nonlinear Dynamics, Vol. 2, No. 4, pgs. 316-323, October 2007.
Griffith, D.T., Carne, T.G., and Paquette, J., “Modal Test Techniques for Validation of Blade Models,” Proceedings of the American Wind Energy Conference WINDPOWER 2007 Conference and Exhibit, June 4-7, 2007, Los Angeles, CA, USA.
Goodding, J., Coombs, D., Babuska, V., Griffith, D.T., Ingram, B., and Robertson, L., “Studies of Free-Free Beam Structural Dynamics Perturbations due to Mounted Cable Harnesses,” 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 23-27, 2007, Waikiki, HI, USA, AIAA-2007-2390.
Singla, P., Griffith, D. T., Katake A., and Junkins, J.L., “Attitude and Interlock Angle Estimation using Split-Field-of-View Star Tracker,” The Journal of the Astronautical Sciences, Vol. 55, No. 1, pgs. 85-105, January-March 2007.
Griffith, D.T. and Carne, T.G, “Experimental Uncertainty Quantification of Modal Test Data,” Proceedings of the 25th International Modal Analysis Conference, February 2007, Orlando, FL, USA.
Carne, T.G., Griffith, D.T., and Casias, M., “Support Conditions for Free-Boundary Condition Modal Tests,” Proceedings of the 25th International Modal Analysis Conference, February 2007, Orlando, FL, USA.
2006
Griffith, D.T. and Segalman, D. J., “Finite Element Calculations Illustrating a Method of Model Reduction for the Dynamics of Structures with Localized Nonlinearities,” Sandia National Laboratories Technical Report, October 2006, Report # SAND2006-5843.
Griffith, D.T. and Mayes, R.L., “Modal Testing of the B61 Fireset,” Internal Memo, Sandia National Laboratories, October 2006.
Griffith, D.T., Smith, G., Casias, M., Reese, S., and Simmermacher, T.W., “Modal Testing of the TX-100 Wind Turbine Blade,” Sandia National Laboratories Technical Report, October 2006, Report # SAND2005-6454.
Casias, M., Smith, G., Griffith, D.T., and Simmermacher, T.W., “Modal Testing of the CX-100 Wind Turbine Blade,” Sandia National Laboratories Technical Report, October 2006.
Simmermacher, T.W., Jones, S., Urbina, A., Griffith, D.T., and Reeder, D., “Development of an Anisotropic, Energy Dependent Model for PZT,” Proceedings of the Society for Experimental Mechanics (SEM) Annual Conference and Exhibition, June 4-7, 2006, Saint Louis, MO, USA.
Griffith, D.T., and Mayes, R.L., “Modal Testing of the B61 Programmer Box,” Internal Memo, Sandia National Laboratories, March 30, 2006.
Griffith, D.T., Casias, M., Smith, G., Paquette, J., and Simmermacher, T.W., “Experimental Uncertainty Quantification of a Class of Wind Turbine Blades,” Proceedings of the 24th International Modal Analysis Conference, February 2006, Saint Louis, MO, USA.
Paquette, J., Laird, D., Griffith, D.T., and Rip, L., “Modeling and Testing of 9m Research Blades,” 44th AIAA Aerospace Sciences Meeting and Exhibit, 9-12 January 2006, Reno, Nevada, AIAA 2006-1199.
Griffith, D.T., “User’s Guide for mat2exo: A program for writing Matlab mat-file data to Exodus II format,” Internal Memo, Sandia National Laboratories, January 12, 2006.
Griffith, D.T., “Reconstructing G-set nodal variables from A-set nodal variables and constraint relations,” Internal Memo, Sandia National Laboratories, January 12, 2006.
2005
Griffith, D.T., Turner, J.D., and Junkins, J.L., “Some Applications of Automatic Differentiation to Rigid, Flexible, and Constrained Multibody Dynamics,” 5th International Conference on Multibody Systems, Nonlinear Dynamics and Control, Long Beach, CA, September 24-28, 2005, v.6 A, p.271-281.
Hurtado, J.E., Sovinsky, M.C., Griffith, D.T., and Turner, J.D., “The Hamel Representation: A Diagonalized Poincaré Form,” 5th International Conference on Multibody Systems, Nonlinear Dynamics and Control, Long Beach, CA, September 24-28, 2005.
Griffith, D. T., Turner, J. D., and Junkins, J. L., “Automatic Generation and Integration of Equations of Motion for Flexible Multibody Dynamical Systems,” The Journal of the Astronautical Sciences, Vol. 53, No. 3, July-September 2005, pp. 251-279.
2004
Griffith, D.T., Turner, J.D., Vadali, S.R., and Junkins, J.L., “Higher-order Sensitivities for Solving Nonlinear Two-Point Boundary Value Problems,” AIAA/AAS Astrodynamics Specialist Conference and Exhibit, August 16-19, 2004, Providence, RI, AIAA-2004-5404.
Griffith, D.T., Junkins, J.L., and Turner, J.D., “Automatic Generation and Integration of Equations of Motion for Linked Mechanical Systems,” 6th International Conference on Dynamics and Control of Systems and Structures in Space, July 18-22, 2004, Riomaggiore, Cinque Terre, Liguria, Italy.
Junkins, J.L., Singla, P., Griffith, D.T., and Henderson, K.T., “Orthogonal Global/Local Approximation in N-Dimensions: Applications to Input/Output Approximation,” 6th International Conference on Dynamics and Control of Systems and Structures in Space, July 18-22, 2004, Riomaggiore, Cinque Terre, Liguria, Italy.
Griffith, D.T., Sinclair, A.J., Turner, J.D., Hurtado, J.E., and Junkins, J.L., “Automatic Generation and Integration of Equations of Motion by Operator-Overloading Techniques,” AAS/AIAA Spaceflight Mechanics Meeting, February 8-12, 2004, Maui, HI, USA, Paper AAS 04-242.
Griffith, D.T., Turner, J.D., and Junkins, J.L., “An Embedded Function Tool for Modeling and Simulating Estimation Problems in Aerospace Engineering,” AAS/AIAA Spaceflight Mechanics Meeting, February 8-12, 2004, Maui, HI, USA, Paper AAS 04-148.
Singla, P., Subbarao, K., Griffith, D.T., and Junkins, J.L., “Autonomous Focal Plane Calibration using Intelligent Radial Basis Function Networks,” AAS/AIAA Spaceflight Mechanics Meeting, February 8-12, 2004, Maui, HI, USA, Paper AAS 04-119.
Singla, P., Griffith, D.T., and Junkins, J.L., “Attitude and Interlock Angle Estimation for the GIFTS Mission,” AAS/AIAA Spaceflight Mechanics Meeting, February 8-12, 2004, Maui, HI, USA, Paper AAS 04-120.
2002
Griffith, D.T. and Junkins, J.L., “Recursive On-orbit Calibration of Star Sensors,” World Space Congress, October 10-19, 2002, Houston, TX, USA.
Griffith, D.T. and Main, J.A., “Experimental Modal Analysis and Damping Estimation For an Inflated Thin Film Torus,” Journal of Guidance, Control, and Dynamics, Vol. 25, No. 4, July-August 2002, pp. 609-617.
Griffith, D.T., Singla, P., and Junkins, J.L, “Autonomous On-orbit Calibration Approaches for Star Tracker Cameras,” AAS/AIAA Spaceflight Mechanics Meeting, January 27-30, 2002, San Antonio, TX, USA, Paper AAS 02-102.
Singla, P., Griffith, D.T., Crassidis, J.L., and Junkins, J.L., “Attitude Determination and Autonomous On-Orbit Calibration of the Star Tracker for the GIFTS Mission,” AAS/AIAA Spaceflight Mechanics Meeting, January 27-30, 2002, San Antonio, TX, USA, Paper AAS 02-101.
2001
Samaan, M.A., Griffith, D.T., Singla, P., and Junkins, J.L., “Autonomous On-orbit Calibration of Star Trackers”, Core Technologies for Space Systems Conference, November 28-30, 2001, Breckenridge, Colorado.
2000
Griffith, D.T. and Main, J.A., “Structural Modeling of Foam-inflated Aerospace Structures,” Journal of Aerospace Engineering, Vol. 13, No. 2, April 2000, pp. 37-46.
Griffith, D.T. and Main, J.A., “Modal Testing of an Inflated Thin Film Polyimide Torus Structure,” 18th International Modal Analysis Conference, February 7-10, 2000, San Antonio, TX, USA.
1999
Hobbs, K. P. Jr, Griffith, D.T., Smith, S.W., and Main, J.A., “Post-flight Testing and Analysis of Zero-g Foam Rigidized Struts,” 40th AIAA Structures, Structural Dynamics, and Materials Conference, April 12-15, 1999, St. Louis, MO, USA, AIAA Paper 99-1524.
1998
Main, J.A. and Griffith, D.T., “Structural Modeling and Morphology of Foam-inflated Aerospace Structures,” 39th AIAA Structures, Structural Dynamics, and Materials Conference, April 20-23, 1998, Long Beach, CA, USA.