Fuel Cell Hybrid-Electric Aircraft: Design, Operational, and Environmental Impact

Scholz, Anna E.; Michelmann, Johannes; Hornung, Mirko

doi:10.2514/6.2022-2333

Cited by 2 publications

(1 citation statement)

References 44 publications

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“…For example, as part of its Green Deal, the European Commission has formulated the goal of zero-emission aircraft being ready for the market by 2035 (European Commission, 2020). Across the globe, a broad range of research initiatives is being implemented which focus on electrified propulsion systems (Pohl et al, 2022;Hofmann et al, 2019;Hoelzen et al, 2018), fuel cell technology (Miazga et al, 2021;Scholz et al, 2022) and sustainable aviation fuels (Abrantes et al, 2021;Holladay et al, 2020). One such upcoming trend and transfer technology into full electrical propulsion systems will be hybridization until sufficiently high energy densities are achieved for battery cells, as shown by Pornet et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Functional Hazard Assessment of the Propulsion Control System Designed for a Small Hybrid Electric Aircraft

Motte¹,

Niehuis²,

Fischer³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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This paper presents the Functional Hazard Assessment (FHA) of a Propulsion Control System (PCS) designed for a hybrid electric aircraft considering the Failure Conditions (FCs) that are novel due to the electrification of the propulsion system. It will be worked out whether these FCs are covered by current certification regulations. After defining the functionality, the FCs for a hybrid electric propulsion system are established, based on current standards and also the Working Group 113 (WG-113) recommendations. The FHA and Preliminary System Safety Assessment (PSSA) approaches are used to evaluate and improve the architecture of the control system. The system functions on propulsion level are defined and allocated to different subsystems. Their FCs and effects are then established. Based on the applicable standards and recommendations of WG-113, these effects are classified, and the Safety Requirements (SRs) are then defined. The FHA results include 23 FCs related to the hybrid system, some of which are not addressed by the current regulatory framework. In summary, this paper outlines how electrified powertrain systems will affect new propulsion architectures from a safety perspective and how the current regulatory framework and the work of the WG-113 could be improved by addressing new FCs resulting from the FHA. By suggesting SRs derived from the FHA, this paper also discusses what system/safety activities need to be undertaken in order to design a propulsion architecture that is compliant with the applicable certification documents.

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