Results 11 to 20 of about 18,950 (295)
A Computational Multiphysics Study of a Satellite Thruster [PDF]
Engineering ProceedingsThis work concerns a study of the thermomechanical behaviour of a commercial thruster for aerospace use. The thruster, operated using a bipropellant liquid mixture, is used for the motion and in-orbit altitude control of small telecommunications ...
Marcello A. Lepore +3 more
doaj +2 more sources
Characterisation of electrospray properties in high vacuum with a view to application in colloid thruster technology [PDF]
, 2005 PhDThe operational environment of colloid thrusters is high vacuum (10-3 _ 10-6 mbar) however, much of the experimental data collected to date to identify parameter relationships in cone jet mode electrosprays (ES), such as current-volumetric flow ...
Smith, Katharine Lucy
core +4 more sources
Inductive Coupling Discharge Characteristics of a 10-cm Dual-Stage 4-Grid Radiofrequency Ion Thruster [PDF]
Journal of Aerospace Technology and Management, 2021 In this study, the numerical simulations are used to simulate the discharge process of a 10-cm dual-stage 4-grid (DS4G) radiofrequency (RF) ion thruster, and the effects of RF coil turns, and electrical parameters on the key plasma parameters inside the ...
Yanxu Pu +7 more
doaj +2 more sources
Adaptive control of ROVs with actuator dynamics and saturation [PDF]
Modeling, Identification and Control, 1992 A direct model reference adaptive controller (MRAC) is derived for an underwater vehicle with significant thruster dynamics and limited thruster power. The reference model decomposition (RMD) technique is used to compensate for the thruster dynamics.
Ola-Erik Fjellstad +2 more
doaj +1 more source
Modelling tunnel thrusters for autonomous underwater vehicles [PDF]
, 2008 With 900 Autonomous Underwater Vehicles (AUVs) required over the next decade (Newman et al., 2007) existing survey-style AUVs need improved utilization factors.
Stevenson, P., Hearn, G.E., Palmer, A.
core +3 more sources
Blended Filter-Based Detection for Thruster Valve Failure and Control Recovery Evaluation for RLV
Algorithms, 2019 Security enhancement and cost reduction have become crucial goals for second-generation reusable launch vehicles (RLV). The thruster is an important actuator for an RLV, and its control normally requires a valve capable of high-frequency operation, which
Hongqiang Sun, Shuguang Zhang
doaj +1 more source
EPJ Techniques and Instrumentation, 2022 The lifetime of electric propulsion (EP) thrusters depends particularly on the erosion characteristics of operation relevant components, for instance, the grid hole erosion of gridded ion thrusters or the channel wall erosion of Hall effect thrusters ...
Carsten Bundesmann +8 more
doaj +1 more source
A multiple thruster array for 30-cm thrusters [PDF]
11th Electric Propulsion Conference, 1975 The 3.0-m diameter chamber of the 7.6-m diameter by 21.4-m long vacuum tank at NASA LeRC was modified to permit testing of an array of up to six 30-cm thrusters with a variety of laboratory and thermal vacuum bread-board power systems. A primary objective of the Multiple Thruster Array (MTA) program is to assess the impact of multiple thruster ...
V. RAWLIN, M. MANTENIEKS
openaire +1 more source
Optimized Use of Thrusters During Transit with a Passenger Ferry [PDF]
TransNav, 2020 This paper aims to address the impact that optimized use of propulsion equipment would have on a ferry during transit. Assuming that the ship arrives at it’s destination on schedule, a potential reduction in fuel consumption would cut the overall cost of
Erik Kløvning
doaj +1 more source
Aerospace, 2023 Pulsed plasma thrusters (PPT) have demonstrated enormous potential since the 1960s. One major shortcoming is their low thrust efficiency, typically
Dillon O’Reilly +6 more
doaj +1 more source