Use this URL to cite or link to this record in EThOS:
Title: Electric tail rotor drive for the more-electric helicopter : a feasibility study
Author: Farman, Jonathan
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2013
Availability of Full Text:
Access from EThOS:
The thesis builds and presents a feasibility study for the use of an electrical transmission to power the tail rotor of a helicopter; the electric tail rotor drive concept. The contributions to knowledge are: • Research into the state-of-the-art in electrical transmission technology and architectures in the context of application as a helicopter tail rotor transmission. Analysis of the best performing and most suitable technologies and the design trade-offs involved. • Development of an electrical transmission sizing model and process for estimating figures for critical factors determining feasibility and initial design optimisation. • Application of research and sizing model to estimate the feasibility of an electric tail rotor drive architecture, the impacts of variations of the architecture and potential improvements brought by further development. The thesis begins with an introduction to more-electric vehicle research, the tail rotor transmission application and the electric tail rotor drive concept. The most critical factors affecting the determination of feasibility are outlined and explained, along with a representation of effectiveness developed through systems thinking. Technical research into electrical transmission technology and architectures is conducted, presenting the state-of-the-art and most suitable for use in the electric tail rotor drive concept. A baseline electric tail rotor drive architecture is presented and explained. An electrical system sizing approach and model developed from technical research is used to calculate values for feasibility factors for the baseline architecture and several variations. Safety cases are developed for triplex and quadruplex architecture. The results of feasibility analyses are presented and compared with the existing mechanical tail rotor drive. Finally, conclusions are drawn about the current feasibility of the electric tail rotor drive, the important technical considerations and the future potential of the concept. The appendices include the derivation of the electrical system sizing model and diagrams generated during the systems thinking exercises.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available