Fuel economy of hybrid electric flight

Donateo, Teresa; Spedicato, Luigi

doi:10.1016/j.apenergy.2017.08.229

Cited by 61 publications

(32 citation statements)

References 28 publications

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“…2, I nom is the nominal current of the battery, C is the battery capacity, n s is the number of battery cells in series, V cell is the voltage of the single battery cell, P batt is the battery delivered power, and n is the Peukert's coefficient equal to 1.05. Note that this is the same formula proposed by Traub [1] but corrected with the Depth of Discharge (DOD) of the battery (80% for lithium-polymer batteries) and validated through comparison with experimental data in Donateo et al [6].…”

Section: Structural Integration and Multi-functionalizationmentioning

confidence: 72%

Electric Aircraft: Exploiting the Synergy between Powertrain, Energy Management and Structure

2018

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This study aims at investigating the synergy between powertrain and structure within the design process of a fixed-wing tail-sitter unmanned aerial vehicle (UAV). The UAV is equipped with a pure-electric power system and has vertical take-off and landing capabilities (VTOL). The problem is addressed by running a contemporary optimization of the parameters of both the powertrain and the UAV’s structure, in order to maximize electric endurance and payload weight through the usage of a performant multi-objective evolutionary algorithm named SMS-EMOA. Three different designs are selected, discussed and compared with literature results on the same UAV to quantify the increase of payload and cruise time that can be obtained by exploiting the synergy between structure and powertrain. The potentiality of furtherly improving payload through the usage of multi-functional panels, while keeping the same endurance, is also quantified and compared with the technologies proposed in literature.

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Section: Structural Integration and Multi-functionalizationmentioning

confidence: 72%

Electric Aircraft: Exploiting the Synergy between Powertrain, Energy Management and Structure

2018

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“…, is derived from a database of commercial Lithium-polymer (Li-po) batteries with a capacity upto 22 Ah (see Figure 3, where values between the brackets represent the number of battery cells in series). Note that the formula used for the discharge time, i.e., Equation (24), has been extensively validated over a large number of experimental data of constant power discharge of different Li-po batteries, in a previous study by the authors [16]. This formula takes into account the effect of the discharge current on the actual battery capacity, through the Peukert's coefficient "peuk" (set equal to 1.05).…”

Section: Batterymentioning

confidence: 99%

Synergy Effects in Electric and Hybrid Electric Aircraft

2019

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The interest in electric and hybrid electric power system has been increasing, in recent times, due to the benefits of this technology, such as high power-to-weight ratio, reliability, compactness, quietness, and, above all, elimination of local pollutant emissions. One of the key factors of these technologies is the possibility to exploit the synergy between powertrain, structure, and mission. This investigation addresses this topic by applying multi-objective optimization to two test cases — a fixed-wing, tail-sitter, Vertical Take-off and Landing Unmanned Aerial Vehicle (VTOL-UAV), and a Medium-Altitude Long-Endurance Unmanned Aerial Vehicle (MALE-UAV). Cruise time and payload weight were selected as goals for the first optimization problem, while fuel consumption and electric endurance were selected for the second one. The optimizations were performed with Non-dominated Sorting Genetic Algorithm-II (NSGA-II) and S-Metric Selection Evolutionary Multiobjective Algorithm (SMS-EMOA), by taking several constraints into account. The VTOL-UAV optimization was performed, at different levels (structure only, power system only, structure and power system together). To better underline the synergic effect of electrification, the potential benefit of structural integration and multi-functionalization was also addressed. The optimization of the MALE-UAV was performed at two different levels (power system only, power system, and mission profile together), to explore the synergic effect of hybridization. Results showed that large improvements could be obtained, either in the first test case when, both, the powertrain design and the aircraft structure were considered, and in the optimization of the hybrid electric UAV, where the optimization of the aircraft flight path gave a strong contribution to the overall performances.

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“…The SOC is set equal to 100% (fully charged battery) at the beginning of the mission and updated at each segment, isegm, with a modified version of the Coulomb counting method. The battery models for charging and discharging have been already presented and validated in a previous work of the authors [15].…”

Section: The Design and Modeling Approachmentioning

confidence: 99%

An Application of the ECMS Strategy to a Wankel Hybrid Electric UAV

2019

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In a previous work, the authors optimized the hybrid electric power system for a tactical Unmanned Aerial Vehicle including a Wankel engine as thermal converter and a permanent magnet electric motor powered by lithium batteries. Startingfrom this optimal configuration, we address here the topic of a refined optimization of the energy management strategy, i.e. the contribution of the battery to the required power in each segment of the flight. The Equivalent Consumption Minimization Strategy (ECMS) was chosen with the goal of minimizing fuel consumption while fully depleting the energy stored in the battery from the beginning to the end of each mission.

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Fuel economy of hybrid electric flight

Cited by 61 publications

References 28 publications

Electric Aircraft: Exploiting the Synergy between Powertrain, Energy Management and Structure

Electric Aircraft: Exploiting the Synergy between Powertrain, Energy Management and Structure

Synergy Effects in Electric and Hybrid Electric Aircraft

An Application of the ECMS Strategy to a Wankel Hybrid Electric UAV

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