Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 227 for “"Thruster"”.
-
A microfabricated colloid thruster array
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
-
Modelling of satellite control thruster plumes
… can arise as a consequence of the impingement of thruster plumes with spacecraft surfaces. Such thrusters are normally fired for attitude control. The prediction of such effects must be undertaken at the design stage of the vehicle.<br/>In this study, the modelling of such plumes was undertaken. …
-
3D-Printed, Internally Fed Electrospray Thruster
An electrospray thruster offers several benefits as a propulsion system for small satellites, including a lower power requirement when miniaturized and a broad range of thrust and specific impulse. However, traditionally it has been manufactured through microfabrication in a cleanroom, which is …
-
Fluid mechanics in a magnetoplasmadynamic thruster
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
-
Improvements to a fully kinetic Hall thruster simulation code and characterization of the cylindrical cusped field thruster
… the operation of miniaturized cylindrical Hall thrusters. This class of space propulsion devices has come under attention since the 1990s as a possible candidate for the propulsion of 100-1000 kg satellites. In first part, a fully kinetic simulation code developed at the MIT Space Propulsion …
-
FILM EVAPORATION MEMS THRUSTER ARRAY FOR MICROPROPULSION
Current small sat propulsion systems require a substantial mass fraction of the vehicle involving tradeoffs between useful payload mass and maneuverability. This is also an issue with available attitude control systems which are either quickly saturated reaction wheels or movable high drag surfaces …
-
Design of a cusped field plasma thruster
A plasma space propulsion thruster has been designed. It is classified as a Cusped Field Thruster (CFT), which refers to the geometry of the magnetic field that influences the flow of electrons and ions. The thruster was modeled after an original Diverging Cusped Field Thruster (DCFT) developed at …
-
Numerical models of Hall thruster ionization oscillations
… low frequency ionization oscillations in Hall thrusters resembling the breathing mode are studied through computational simulation. The relationship between wall erosion and discharge current oscillations is analyzed using particle-in-cell simulation, and a series of parametric simulations is …
-
Propulsion mechanisms in a helicon plasma thruster
Electric thrusters offer an attractive option for various in-space propulsion tasks due to their high thrust efficiencies. The performance characteristics of a compact electric thruster utilizing a helicon plasma source is investigated with the goal of identifying potential thrust mechanisms. …
-
Hybrid-PIC modeling of Hall thruster plumes
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
-
Autonomous thruster failure recovery for underactuated spacecraft
Thruster failures historically account for a large percentage of failures that have occurred on orbit. Therefore, autonomous thruster failure detection, isolation, and recovery (FDIR) is an essential component to any robust space-based system. This thesis focuses specifically on developing thruster …
-
Development of the plasma thruster particle-in-cell simulator to complement empirical studies of a low-power cusped-field thruster
Cusped-field plasma thrusters are an electric propulsion concept being investigated by several laboratories in the United States and Europe. This technology was implemented as a low-power prototype in 2007 to ascertain if durability and performance improvements over comparable Hall thruster designs …
-
Design of a controllable pitch underwater thruster system
Control systems for underwater vehicles have reached the level of sophistication where they are limited by the dynamic performance of the thrust actuators. Standard fixed-pitch propellers have been shown to have very poor dynamic characteristics, particularly at low thrust levels The dynamic …
-
Reducing spacecraft thruster plume contamination using convex optimization
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
-
Design of a miniaturized Hall thruster for microsatellites
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
-
Theoretical and experimental investigation of Hall thruster miniaturization
… the area of formation flight. Miniaturized Hall thrusters have been identified as a candidate for lightweight, high specific impulse propulsion systems that can extend mission lifetime and payload capability. A set of scaling laws was developed that allows the dimensions and operating parameters …
-
CubeSat attitude control using micronewton electrospray thruster actuation
Micronewton electrospray thrusters are a promising new actuator for CubeSat attitude control. Electrospray thrusters have advantages over current state of the art CubeSat attitude actuators in mass, volume, and their ability to produce translational acceleration in addition to control moments. An …
-
Reconfigurable thruster selection algorithms for aggregative spacecraft systems
… has not been explored deeply enough is that of thruster selection algorithms. In spacecraft control, thruster selection algorithms determine which thrusters to re to produce a commanded force or torque on the system. Thus, these algorithms are critical for implementation of new controllers. To …
Page 1 of 12