Validation of Models for Small Scale Electric Propulsion Systems

Lundström, David; Amadori, Kristian; Krus, Petter

doi:10.2514/6.2010-483

Cited by 34 publications

(14 citation statements)

References 4 publications

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“…Furthermore, propulsion dynamics can be considered as a typical DC Motor equations [19,20]. Hence, the DC motor equations [21,22] can be written based on properties of electric motor, propeller and battery stated in Ref.…”

Section: Iic Applied Forces and Momentsmentioning

confidence: 99%

Controllability Analysis of a Mass-Actuated Airplane

Erturk

Dogan

2015

AIAA Atmospheric Flight Mechanics Conference

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This paper is to follow up on prior work on a mass-actuated airplane that is controlled by internally moving masses instead of conventional control surfaces. The mass-actuated aircraft effectively has two control variables: the internal positions of two control masses, one of which is moved longitudinal along the body x-axis and the other is moved laterally along the wings. Prior works showed feasible trim results of mass actuated airplane during straight level flight and steady state turn with and without side slip angle at constant altitude. This work investigates the controllability of the aircraft with mass actuation. Furthermore, to determine quality or level of controllability by mass-actuation as compared to that by aerodynamic control surfaces, two different methods are used: (i) a measure of controllability based on controllability Gramian and (ii) values of pertaining entries in control/input matrix.

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Section: Iic Applied Forces and Momentsmentioning

confidence: 99%

Controllability Analysis of a Mass-Actuated Airplane

Erturk

Dogan

2015

AIAA Atmospheric Flight Mechanics Conference

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“…Additionally the rig measures rpm, free stream static and dynamic pressure, air temperature, flow inclination in pitch and yaw using vanes, and, although not required, it also measures the motor current and input voltage. The hardware design for torque and thrust measurement is described in more detail in Ref [12] where it was used to study the characteristics of electric motors and motor controllers.…”

Section: Propulsion System Characterizationmentioning

confidence: 99%

Testing of Atmospheric Turbulence Effects on the Performance of Micro Air Vehicles

Lundström

Krus

2012

International Journal of Micro Air Vehicles

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Micro Air Vehicles (MAV) are generally operated at low altitudes and within the earth boundary layer. This is a very dynamic environment with varying wind intensity and turbulence levels far greater than those experienced by traditional manned aircraft cruising at higher altitudes. Yet aerodynamic research on MAVs is often based on the assumption of steady aerodynamics. Little effort has been made to experimentally determine the validity of this assumption. In this paper, the effect of turbulence on the performance of a MAV is studied using flight testing in different wind conditions. Flight testing technique, data logging equipment and data reduction are explained. Additionally, a low cost technique for propeller performance measurement is presented. Results show that the flow around a MAV flying in windy conditions qualifies as highly unsteady, although the impact on its performance is surprisingly small for the kind of turbulence levels at which MAVs can be expected to operate. Accelerometer data from the flights reveals that if steady aerodynamic theory is assumed, increasing turbulence should have resulted in a measurable drag increase, thus indicating that the tested MAV to some extent passively manages to benefit from the turbulence.

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“…In the -Validation of Small Scale Electric Propulsion System Models,‖ motors are studied. 27 Yet, this study also applies to generators because it demonstrates that optimizing the -propulsion system‖ can be more important than optimizing the aerodynamics. This report additionally teaches that designers have to be careful when purchasing off-the-shelf parts, such as motors, because the actual measured efficiencies may not match the advertised efficiencies given by the manufacturer.…”

Section: Electric Generatorsmentioning

confidence: 99%

Airborne Wind Energy: Implementation and Design for the US Air Force

Cahoon¹

2011

9th Annual International Energy Conversion Engineering Conference

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Excitement among researchers about Airborne Wind Energy (AWE) technology matches DoD aims to advance and employ renewable energy. AWE seeks to costeffectively tap the vast supply of wind energy available at altitudes high above the reach of conventional, ground-based wind turbines (e.g. 500-12,000 m). This paper explores the viability and implementation of AWE technology for fulfilling USAF energy needs. The characteristics, potential, and developmental status of the AWE resource are presented. A design tool for a rotor-based AWE system is developed, facilitating the analysis of blade performance to simplify design and provide the best efficiencies for a range of conditions. USAF bases are evaluated based upon energy needs, design requirements, and other factors to determine which bases could benefit most from AWE.

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Validation of Models for Small Scale Electric Propulsion Systems

Cited by 34 publications

References 4 publications

Controllability Analysis of a Mass-Actuated Airplane

Controllability Analysis of a Mass-Actuated Airplane

Testing of Atmospheric Turbulence Effects on the Performance of Micro Air Vehicles

Airborne Wind Energy: Implementation and Design for the US Air Force

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