scholarly journals Design and Experimental Characterisation of an Additively Manufactured Heat Exchanger for the Electric Propulsion Unit of a High-Altitude Solar Aircraft

2019 ◽  
Author(s):  
Rafal Wrobel ◽  
Ben Scholes ◽  
Ahmad Mustaffer ◽  
Sana Ullah ◽  
David Reay ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
High Altitude ◽  
Electric Propulsion ◽  
Propulsion Unit ◽  
Experimental Characterisation

Dynamic Model Identification of Marine Electric Propulsion System

2012 ◽  
Vol 503-504 ◽  
pp. 1357-1359
Author(s):  
Qiang Wu ◽  
Hao Xiong ◽  
Guang Wei Meng ◽  
Li Bing Zhou
Keyword(s):  
Dynamic Model ◽  
Electric Propulsion ◽  
System Analysis ◽  
Model Identification ◽  
Propulsion System ◽  
Experimental Result ◽  
Experiment Data ◽  
Electric Propulsion System ◽  
Identification Technique ◽  
Propulsion Unit

This paper applies identification technique to the marine electric propulsion system analysis, adopts the recursive extended least squares (RELS) algorithm to estimate the structure and parameters of the model, employs the variable forgetting factors into the algorithm to improve the tracking characteristic of the parameters, establishes the dynamic model of a simulated electric propulsion unit under the excitation control based on the experiment data, and finally verifies the validity of the method through the consistency between simulation result and experimental result.

scholarly journals Design and Construction of a Modular Pump-Jet Thruster for Autonomous Surface Vehicle Operations in Extremely Shallow Water

2019 ◽  
Vol 7 (7) ◽  
pp. 222 ◽  
Author(s):  
Angelo Odetti ◽  
Marco Altosole ◽  
Gabriele Bruzzone ◽  
Massimo Caccia ◽  
Michele Viviani
Keyword(s):  
Environmental Monitoring ◽  
Water Depth ◽  
Electric Propulsion ◽  
Shallow Waters ◽  
3D Printer ◽  
Flat Bottom ◽  
Autonomous Surface Vehicles ◽  
Autonomous Surface Vehicle ◽  
Innovative Materials ◽  
Propulsion Unit

This paper describes a customized thruster for Autonomous Surface Vehicles (ASV). The thruster is a Pump-Jet Module (PJM), which has been expressly designed, modeled, constructed, and tested for small-/medium-sized ASVs that perform environmental monitoring in extremely shallow waters such as wetlands (rivers, lakes, swamps, marshes), where water depth is only a few centimeters. The PJM is a fully-electric propulsion unit with a 360-degree continuous steering capability. Its main advantage is that the unit is flush with the flat bottom of the vehicle. This makes the PJM suitable for operation in extremely shallow waters because the risk of damaging the thrusting unit in case of grounding is very limited. The PJM was produced using innovative materials, and the hydraulic components were all constructed using a 3D printer.

scholarly journals Method for Characterization of a Multirotor UAV Electric Propulsion System

2020 ◽  
Vol 10 (22) ◽  
pp. 8229
Author(s):  
Petar Piljek ◽  
Denis Kotarski ◽  
Matija Krznar
Keyword(s):  
Electric Propulsion ◽  
High Energy ◽  
Propulsion System ◽  
Signal Acquisition ◽  
Aerial Robots ◽  
Electric Propulsion System ◽  
Measurement Results ◽  
Propulsion Unit ◽  
High Energy Consumption

Due to their abilities, multirotor unmanned aerial vehicles (UAVs) can be used in various missions that require complex and precise movements, so they are a typical representative of aerial robots. Since this type of UAV is characterized by high energy consumption, it is of most importance to precisely choose the system parameters and components in order to achieve the required flight performance that meets the mission requirements. In this paper, a method for characterization of the multirotor UAV propulsion system is proposed, which is a fundamental step in the design process of this type of UAV. For the purpose of method validation, experimental measurements and signal acquisition were performed, and the measurement results for the considered electric propulsion units were shown. An identification procedure is presented, which is used to process the measurement results or manufacturer’s data and display them as propulsion unit static maps. Based on static maps, the characterization process of the electric propulsion system is performed, and the propulsion unit characteristics are shown.

scholarly journals Design of a rapid transit to Mars mission using laser-thermal propulsion

2022 ◽  
Author(s):  
Emmanuel Duplay ◽  
Zhuo Fan Bao ◽  
Sebastian Rodriguez Rosero ◽  
Arnab Sinha ◽  
Andrew Jason Higgins
Keyword(s):  
Electric Propulsion ◽  
Specific Impulse ◽  
Mission Design ◽  
Rapid Transit ◽  
Laser Array ◽  
Heating Chamber ◽  
Atmospheric Compensation ◽  
Spacecraft Mission ◽  
Directed Energy ◽  
Propulsion Unit

The application of directed energy to spacecraft mission design is explored using rapid transit to Mars as the design objective. An Earth-based laser array of unprecedented size (10-m diameter) and power (100 MW) is assumed to be enabled by ongoing developments in photonic laser technology. A phased-array laser of this size and incorporating atmospheric compensation would be able to deliver laser power to spacecraft in cislunar space, where the incident laser is focused into a hydrogen heating chamber via an inflatable reflector. The hydrogen propellant is then exhausted through a nozzle to realize specific impulses of 3000 s. The architecture is shown to be immediately reusable via a burn-back maneuver to return the propulsion unit while still within range of the Earth-based laser. The ability to tolerate much greater laser fluxes enables realizing the combination of high thrust and high specific impulse, making this approach favorable in comparison to laser-electric propulsion and occupying a parameter space similar to gas-core nuclear thermal rockets (without the requisite reactor). The heating chamber and its associated regenerative cooling and propellant handling systems are crucial elements of the design that receive special attention in this study. The astrodynamics and the extreme aerocapture maneuver required at Mars arrival after a 45-day transit are also analyzed in detail. The application of laser-thermal propulsion as an enabling technology for other rapid transit missions in the solar system and beyond is discussed.

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