Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Battery Sensitivity Analysis on Initial Sizing of eVTOL Aircraft

전기 추진 수직이착륙기의 초기 사이징에 대한 배터리 민감도 분석

  • Received : 2022.09.22
  • Accepted : 2022.11.09
  • Published : 2022.12.01
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Abstract

Sensitivity of aircraft sizing depending on battery performance was studied for a generic quad tilt rotor type electric vertical takeoff and landing vehicle. The mission requirements proposed by Uber Elevate and NASA were used for initial sizing, and the calculated gross weight is ranged between 5,000lb and 11,000lb for battery specific energy range of 200-400Wh/kg in pack level and continuous discharge rate range of 4-5C. For the assumed gross weight of 7,000lb, the required battery performance was calculated with two different criteria: available power and energy, and the effects of battery specific energy and discharge rate are analyzed. The maximum discharge rate is also recommended considering failure cases such as one battery pack inoperative and one prop rotor inoperative.

본 연구는 일반적인 쿼드 틸트 로터 타입의 전기 추진 수직이착륙 항공기에 대하여 배터리의 성능에 따른 기체 사이징의 민감도를 분석하였다. Uber Elevate와 NASA가 제시한 임무 요구도를 기반으로 초기 기체 사이징을 수행하였으며, 200Wh/kg~400Wh/kg의 배터리 팩 기준 비에너지와 4C~5C의 연속 방전율 범위에 대하여 항공기의 총 중량은 5,000lb~11,000lb으로 예측되었다. 기체 총 중량을 7,000lb를 가정 시 가용 출력과 가용 에너지 측면에서 각각 요구되는 배터리 사양을 도출하였으며, 배터리 비에너지와 방전율의 영향을 분석하였다. 배터리 팩 고장 및 프롭 로터 고장과 같은 조건을 고려하여 배터리 최대 방전율 또한 제시하였다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호 RS-2022-00143965)

References

  1. Moore, M. D., "The Third Wave of Aeronautics: On-Demand Mobility," SAE General Aviation Technology Conference and Exhibition, 2006, pp. 713~722
  2. Holden, J. and Goel, N., "Fast-Forwarding to a Future of On-Demand Urban Air Transportation," Uber White Paper, 2016.
  3. Sripad, S. and Viswanathan, V., "The Promise of Energy-efficient Battery-powered Urban Aircraft," Proceedings of the National Academy of Sciences, Vol. 118, No. 45, 2021.
  4. Kim, D. H., Jang, H. Y. and Hwang, H. Y., "Analyses of Hover Lift Efficiency, Disc Loading and Required Battery Specific Energy for Various eVTOL Type," Journal of Advanced Navigation Technology, Vol. 25, No. 3, 2021, pp. 203~210. https://doi.org/10.12673/JANT.2021.25.3.203
  5. Uber, "Uber Air Vehicle Requirements and Missions," 2019, viewed September 22, 2022,
  6. Patterson, M. D., German, B. J. and Moore, M. D., "Performance Analysis and Design of On-Demand Electric Aircraft Concepts," 12th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference and 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization, Indianapolis, IN, September 2012.
  7. Johnson, W., "NDARC: NASA Design and Analysis of Rotorcraft Theory," NASA/TP- 20220000355, Vol. 1, 2022.
  8. Johnson, W., "NDARC:NASA Design and Analysis of Rotorcraft Input," NASA/TP-20220000355, Vol. 3, 2022.
  9. Johnson, W., Silva, C. and Solis, E., "Concept Vehicles for VTOL Air Taxi Operations.," American Helicopter Society Technical Conference on Aeromechanics Design for Transformative Vertical Flight, San Francisco, CA, January 2018.
  10. Silva, C., Johnson, W. R., Solis, E., Patterson, M. D. and Antcliff, K. R., "VTOL Urban Air Mobility Concept Vehicles for Technology Development," 2018 Aviation Technology, Integration, and Operations Conference, Atlanta, GA, June 2018.
  11. Radotich, M., "Conceptual Design of Tiltrotor Aircraft for Urban Air Mobility," VFS Aeromechanics for Advanced Vertical Flight Technical Meeting, San Jose, CA, January 25-27, 2022.
  12. Johnson, W. and Silva, C., "NASA Concept Vehicles and the Engineering of Advanced Air Mobility Aircraft," The Aeronautical Journal, Vol. 126, No. 1295, 2022, pp. 59~91. https://doi.org/10.1017/aer.2021.92
  13. Vegh, J. M., Botero, E., Clarke, M., Smart, J. and Alonso, J. J., "Current Capabilities and Challenges of NDARC and SUAVE for eVTOL Aircraft Design and Analysis," 2019 AIAA Propulsion and Energy 2019 Forum, August 19-22, Indianapolis, IN, 2019.
  14. Clarke, M. and Alonso, J. J., "Lithium-Ion Battery Modeling for Aerospace Applications," Journal of Aircraft, Vol. 58, No. 6, 2021, pp. 1323~1335. https://doi.org/10.2514/1.C036209
  15. Lee, D., Lim, D. and Yee, K., "Generic Design Methodology for Vertical Takeoff and Landing Aircraft with Hybrid-Electric Propulsion," Journal of Aircraft, Vol. 59, No. 2, 2022, pp. 278~292. https://doi.org/10.2514/1.C036214
  16. Kim, H. and Yee, K., "A Novel Cost Estimation Method for UAM eVTOLs," Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 49, No. 3, 2021, pp. 233~241.
  17. Kim, H., Kim, H., Lim, D. and Yee, K., "Development of a Multidisciplinary Design Framework for Urban Air Mobility," Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 50, No. 8, 2022, pp. 583~590.
  18. Duffy, M. J., Wakayama, S. R. and Hupp, R., "A Study in Reducing the Cost of Vertical Flight with Electric Propulsion," 17th AIAA Aviation Technology, Integration, and Operations Conference, June 5-9, Denver, CO, 2017.
  19. Brown, A. and Wesley, L. H., "Vehicle Design and Optimization Model for Urban Air Mobility," Journal of Aircraft, Vol. 57. No. 6, 2020, pp. 1003~1013. https://doi.org/10.2514/1.C035756
  20. Fryar, C., Gu, Q., Ogden, C. and Flegal, K., "Anthropometric Reference Data for Children and Adults: United States, 2011-2014," Vital and Health Statistics Series, Vol. 3, No. 39, 2016.
  21. Chappell, D. and Peyran, R., "Methodology for Estimating Wing Weights for Conceptual Tilt-Rotor and Tilt-Wing Aircraft," SAWE 51st Annual Conference, Hartford, CT, May 18-20, 1992.
  22. Chappell, D. P., "Tilt-rotor Aircraft Wing Design," ASRO-PDT-83-1, 1983.
  23. Wood, T. L. and Peryea, M. A., "Reduction of Tiltrotor Download," Journal of the American Helicopter Society, Vol. 40. No. 3, 1995, pp. 42~51. https://doi.org/10.4050/JAHS.40.42
  24. Borer, N. K., Patterson, M. D., Viken, J. K., Moore, M. D., Clarke, S., Redifier, M. E., Christie, R. J., Stoll, A. M., Dubois, A., Bevirt, J., Gibson, A., Foster, T. J. and Osterkamp, P. G., "Design and Performance of the NASA SCEPTOR Distributed Electric Propulsion Flight Demonstrator," 16th AIAA Aviation Technology, Integration, and Operations Conference, Washington, D.C., June 13-17, 2016.
  25. Stoll, A. M., Beviert, J., Moore, M. D., Fredericks, W. J. and Borer, N. K., "Drag Reduction through Distributed Electric Propulsion," 14th AIAA Aviation Technology, Integration, and Operations Conference, Atlanta, GA, June 16-20, 2014.
  26. Patterson, J. C. Jr. and Flechner, S. G., "Exploratory Wind-Tunnel Investigation of a Wingtip Mounted Vortex Turbine for Vortex Energy Recovery," NASA Technical Paper 2468, June 1985.
  27. Miranda, L. R. and Brennan, J. E., "Aerodynamic Effects of Wingtip-Mounted Propellers and Turbines," 4th Applied Aerodynamics Conference, San Diego, CA, June 1986.
  28. Robuck, Mark, et al., "Design Study of Propulsion and Drive Systems for the Large Civil Tilt Rotor (LCTR2) Rotorcraft," 67th AHS Annual Forum and Technology Display, Virginia Beach, VA, May 3-5, 2011.
  29. Silva C., Calvet, M., Nunez, G. F., Scott, R., Sinsay, J. D. and Vocke, R. D., "The High Efficiency Tiltrotor as a Solution to the Needs of a Mobile Military," AHS Technical Meeting on Aeromechanics Design for Vertical Lift, San Francisco, CA, January 20-22, 2016.
  30. 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, 2021.
  31. Harris, F. D. and Scully, M. P., "Rotorcraft Cost Too Much," Journal of the American Helicopter Society, Vol. 43, No. 1, 1998.
  32. Scott, R., "A Design-Centric Evaluation of Multi-Fidelity Cost Modeling Approaches," 44th European Rotorcraft Forum, Delft, The Netherlands, September 19-20, 2018.
  33. Office of the Under Secretary of Defense (Comptroller) of U.S. Department of Defense, "National Defense Budget Estimates for FY 1998/2021," March 1997/2020.
  34. Bureau of Labor Statistics of U.S. Department of Labor, "Consumer Price Index for All Urban Consumers (CPI-U), U.S. City Average," 2020.
  35. Borlaug, B., Muratori, M., Gerdes, M. and Salisbury, S., "Levelized Cost of Charging Electric Vehicles in the United States," 2020.
  36. Harris, F. D., "Introduction to Autogyros, Helicopters, and Other V/STOL Aircraft," NASA/SP, 2012-215959, Vol. 2, 2012.
  37. Wang, M., Diepolder, J., Zhang, S., Sopper, M. and Holzapfel, F., "Trajectory Optimization-based Maneuverability Assessment of eVTOL aircraft," Aerospace Science and Technology, Vol. 117, 2021, 106903. https://doi.org/10.1016/j.ast.2021.106903
  38. Kreimeier, M., "Evaluation of On-demand Air Mobility Concepts with Utilization of Electric Powered Small Aircraft," Doctoral Dissertation, RWTH Aachen University, 2018.
  39. Severson, K. A., Attia, P. M., Jin, N., Perkins, N., Jiang, B., Yang, Z., Chen, M. H., Aykol, M., Herring, P. K., Fraggedakis, D., Bazant, M. Z., Harris, S. J., Chueh, W. C. and Braatz, R. D., "Data-driven Prediction of Battery Cycle Life before Capacity Degradation," Nature Energy, Vol. 4. No. 5, 2019, pp. 383~391. https://doi.org/10.1038/s41560-019-0356-8
  40. Cole, W., Frazier, A. W. and Augustine, C., "Cost Projections for Utility-scale Battery Storage: 2021 Update," NREL/TP-6A20-79236, June 2021.