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Showing 1 to 12 of 12 for “"Thrust Measurement"”.
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Thrust measurement of the busek bht 20 microhall effect thruster
… results of testing a low power micro-hall effect thruster suitable for various mission objectives such as orbital maneuvers, momentum dumping, and precision pointing for microsatellites. The BHT 20 is a low power micro-hall effect thruster capable of generating thrust at the µN thrust level. The …
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Testing of a Magnetically Levitated Rocket Thrust Measurement System Demonstrator for NASA
Existing thrust measurement systems (TMSs) at NASA Stennis Space Center use strain gauges and flux plates to measure forces produced by a test article. Alignment and calibration can take two weeks or more every time a piece of hardware or test article is changed. Cross axis loading is also …
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Analysis of mixing and thrust diagnostics for shock tunnel hot nozzle testing
… presents the design and assessment of mixing and thrust measurement systems for use with a shock tunnel for these applications. Results from preliminary testing of focused-Schlieren, shearing interferometer, and Mie-scattering systems are presented. The Mie-scattering method was judged to be most …
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Method and Simulation of On-Orbit Sub-microthrust Evaluation
… and imaging missions, finer micro- to sub-micro- thrusters have become an area of high interest. As thrusters are developed and ground-tested, it is necessary to evaluate their thrust performance on-orbit. On-orbit measurements offer actual thrust performance in mission conditions, free from …
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Effect of Nozzle Pressure Ratio on Thrust and Flow Behavior in a Supersonic De Laval Nozzle
… an ideally expanded condition yields optimal thrust, practical propulsion systems rarely operate at this design point due to variations in altitude and engine operating conditions. As a result, nozzles frequently operate in off-design conditions. In overexpanded regime, where the exit pressure …
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Design and Evaluation of a Propulsion System for Small, Compact, Low-Speed Maneuvering Underwater Vehicles
… system is demonstrated and assessed via direct thrust measurement experiments and by use of an initial proof-of-concept test vehicle. Experiments are performed to enable the evaluation and modelling of the thrust output of the mechanism as well as the speed capability of a vehicle employing the …
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Construction and performance of an inverted pendulum thrust balance
… thesis was to devise a means of profiling the thrust of the MIT Space Propulsion Lab's (SPL) Diverging Cusped Field (DCF) thruster and, more generally, other thrusters of similar size and thrust levels. The former SPL thrust stand, which had been used to characterize the BHT-200 engine, was not …
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A Multi-Point Measurement Technique for the Enhancement of Force Measurement with Active Magnetic Bearings (AMB)
… as support bearings and as load sensing measurement tools. Previous work in the area of AMB force measurement has relied upon basic magnetic equations requiring knowledge of coil currents and air gap lengths. Some researchers have utilized magnetic flux probes to eliminate the need for …
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Phase Transform Time Delay Estimation to Counteract Spectral Haystacking Effects in Jet Exhaust Flow Measurements
… to estimate the traversal time of the signal. Thrust measurement is possible with enough time delay estimates across different portions of the exhaust. This preliminary study did not take the full array of data necessary to measure thrust, but did validate key aspects of the measurement …
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Spacecraft charging and attitude control characterization of electrospray thrusters on a magnetically levitated testbed
Electrospray thrusters are an attractive technology for small satellite propulsion. A thorough study of the spacecraft charging and attitude control performance of electrospray thrusters acting on a small satellite is presented. The experimental portion of the study employs a new type of …
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Advances in electroaerodynamic thrusters for aircraft propulsion
An electroaerodynamic (EAD) thruster is a propulsion system for small aircraft that is mechanically simple, has no moving parts, and is nearly silent. EAD thrusters produce ions from atmospheric air and accelerate the ions across two electrodes separated by an air gap: collisions of ions with …