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Runtime assurance method for eVTOL intelligent obstacle avoidance system toward safety of intended functionality
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Lei DONG1, 2, Wenjia SONG1, 3, Xi CHEN1, 2, **, Jiachen LIU1, 4, Boyao LIANG1, 4
China Safety Science Journal | 2024, 34(7) : 105 - 112
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China Safety Science Journal | 2024, 34(7): 105-112
• Safety engineering technology •
Runtime assurance method for eVTOL intelligent obstacle avoidance system toward safety of intended functionality
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Lei DONG1, 2, Wenjia SONG1, 3, Xi CHEN1, 2, **, Jiachen LIU1, 4, Boyao LIANG1, 4
Affiliations
  • 1 Key Laboratory of Civil Aircraft Airworthiness Technology，Civil Aviation University of China，Tianjin 300300，China
  • 2 Science and Technology Innovation Research Institute，Civil Aviation University of China，Tianjin 300300，China
  • 3 Sino-European Institute of Aviation Engineering，Civil Aviation University of China，Tianjin 300300，China
  • 4 College of Safety Science and Engineering，Civil Aviation University of China，Tianjin 300300，China
Published: 2024-07-28 doi: 10.16265/j.cnki.issn1003-3033.2024.07.0198
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To ensure the SOTIF of eVTOL vehicles in UAM and reduce the verification difficulty of artificial intelligence algorithms，an obstacle avoidance model was proposed based on RTA method. Firstly，SAC (soft actor-critic) algorithm improved by the artificial potential field method was used as the complex function of the eVTOL intelligent obstacle avoidance system. Then，dynamic response planning (DRP) was used as a backup function of the intelligent avionics system to mitigate SOTIF hazards. Moreover，monitoring and decision-making modules were adopted to obtain environmental conditions and develop an RTA architecture. Finally，the simulated obstacle avoidance performance was compared between the two systems using complex function and RTA. The results showed that both methods can achieve obstacle avoidance，but the traditional obstacle avoidance system using complex functions may impose SOTIF risk. The RAT architecture design increased safe flight time from 78.4% to 98.15%，with the total route length only increasing by 0.95%，reducing risks in operational scenarios while ensuring efficiency.

safety of the intended functionality (SOTIF)  /  electric vertical take-off and landing (eVTOL)  /  runtime assurance (RTA)  /  urban air mobility (UAM)  /  intelligent obstacle avoidance system
Lei DONG, Wenjia SONG, Xi CHEN, Jiachen LIU, Boyao LIANG. Runtime assurance method for eVTOL intelligent obstacle avoidance system toward safety of intended functionality[J]. China Safety Science Journal, 2024 , 34 (7) : 105 -112 . DOI: 10.16265/j.cnki.issn1003-3033.2024.07.0198
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Year 2024 volume 34 Issue 7
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2024.07.0198
  • Receive Date：2024-01-13
  • Online Date：2025-07-09
  • Published：2024-07-28
Article Data
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History
  • Received：2024-01-13
  • Revised：2024-04-21
Funding
Affiliations
    1 Key Laboratory of Civil Aircraft Airworthiness Technology，Civil Aviation University of China，Tianjin 300300，China
    2 Science and Technology Innovation Research Institute，Civil Aviation University of China，Tianjin 300300，China
    3 Sino-European Institute of Aviation Engineering，Civil Aviation University of China，Tianjin 300300，China
    4 College of Safety Science and Engineering，Civil Aviation University of China，Tianjin 300300，China
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