eprintid: 10188575 rev_number: 8 eprint_status: archive userid: 699 dir: disk0/10/18/85/75 datestamp: 2024-04-26 10:28:58 lastmod: 2024-04-26 10:28:58 status_changed: 2024-04-26 10:28:58 type: thesis metadata_visibility: show sword_depositor: 699 creators_name: Park, Moonsoo title: Integrated system modelling approach for developing mini flapping wing aerial vehicles ispublished: unpub divisions: UCL divisions: B04 divisions: C05 divisions: F45 note: Copyright © The Author 2024. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. abstract: This thesis studies the mathematical modelling for motor-actuated and piezoelectric beam-type actuator-driven mini-flapping wing aerial vehicles (MFAV). The investigated systems are composed of three essential components: the actuator, transmission, and wings. By integrating the characteristic equations governing these parts, the mechanical responses of the systems are thoroughly examined. MATLAB and Simulink are employed to conduct simulations, enabling in-depth exploration of the energy flow within the electromechanical system and their optimisations under realistic loads. The developed electromechanical models for motor-actuated MFAVs effectively capture the system's behaviour by considering the commercial DC gear motor and the flapping mechanism. The system's losses are modelled using the Coulomb friction model, enabling prediction of the system's energetic requirements which is not possible otherwise. The model also allows examination of the impact of adding elastic storage elements to the system. Optimal crank and connecting rod lengths are identified through trend analysis, and the system's performance under varying operational conditions is evaluated. A comparison between slider-crank and direct drive systems offers valuable insights into their respective advantages and drawbacks, revealing the direct drive model's superior performance in terms of average lift and system efficiency. A mathematical model for piezoelectric bimorph actuators is established and its effectiveness is confirmed using Ansys. The model serves as the basis for developing a comprehensive mathematical model for piezoelectric bimorph-actuated MFAV. The model includes the wing morphology and aerodynamic effects encompassing translation, added mass effect, and rotation around the leading edge axis. Lastly, optimisation is performed, and the maximum stress in the piezoelectric actuator is examined to ensure structural integrity. The analysis focuses on the net lift, and stroke and pitch angles of the wing. The optimised system’s performance is assessed under different voltages. Additionally, the influence of aerodynamic coefficients and the flexural hinge on the piezoelectric bimorph-actuated flapping wing system is established. date: 2024-03-28 date_type: published oa_status: green full_text_type: other thesis_class: doctoral_open thesis_award: Ph.D language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2254564 lyricists_name: Park, Moonsoo lyricists_id: MPARK95 actors_name: Park, Moonsoo actors_name: Dewerpe, Marie actors_id: MPARK95 actors_id: MDDEW97 actors_role: owner actors_role: impersonator full_text_status: public pages: 279 institution: UCL (University College London) department: Mechanical Engineering thesis_type: Doctoral citation: Park, Moonsoo; (2024) Integrated system modelling approach for developing mini flapping wing aerial vehicles. Doctoral thesis (Ph.D), UCL (University College London). Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10188575/1/Park_Thesis.pdf