| This paper examines dynamical models for bladedpropeller type marine thrusters. Previously reported thruster dynamics models are reviewed, and a simpli ed model is proposed. Experimental testing of both the transient and steady-state performance of a marine thruster corroborates previously reported data, validates the simpli ed thruster model, and raises new questions. A companion paper repor...

This paper examines dynamical models for bladedpropeller type marine thrusters. Previously reported thruster dynamics models are reviewed, and a new simplified model is proposed. Experimental testing of both the transient and steady-state performance of a marine thruster corroborates previously reported data, validates the simplified thruster model, and raises new questions.

A time-accurate 2D axisymmetric Hybrid PIC-MCC model is used to simulate the plasma flow in the acceleration channel and near-field plume of a Hall thruster. The model is applied to the P5 Hall thruster due to known magnetic configuration and the availability of experimental data on the plasma properties in the interior and near-field plume for this thruster. Results for thruster performance an...

This paper reports two speci c improvements in the nite-dimensional nonlinear dynamical modeling of marine thrusters. Previously reported four-quadrant models have employed airfoil theory considering only axial uid ow and using sinusoidal lift/drag curves. First, we present a thruster model incorporating the e ects of rotational uid velocity and inertia on thruster response. Second, we report a...

A 10 cm stand-alone gridded ion thruster discharge chamber based on a laboratory demonstration model that utilized a planar inductive antenna was designed and fabricated. The source features multipole confinement which has been shown to dramatically improve performance based on significant increases in ion density observed in demonstration tests. The thruster design considerations and the perfo...

This paper reports a comparative experimental evaluation of proportional derivative and adaptive modelbased control for underwater vehicles. To the best of the authors’ knowledge, this is the first such evaluation of modelbased adaptive tracking control for underwater vehicles during simultaneous dynamic motion in all 6 degrees-of-freedom. This experimental evaluation revealed the presence of u...

A sub-micronewton level thrust stand is used to evaluate the performance of five different microthrusters. Using a torsional balance design, the JPL microthrust stand (μTS) is capable of measuring steady-state thrust as low as 1 μN with sub-micronewton resolution and an impulse as low as 1 μNs with sub-micronewton-second resolution. The μTS can support a test object with a mass as large as 10 k...

ONERA is involved in the testing and development of new current-free electric thruster (helicon thruster or ECR thruster), using magnetized plasmas. For this development, a numerical tool is desirable to model the magnetized plasma, and assess the overall performances of the system. For this reason, a model for the plasma produced in the thruster has been developed. It boils down to a single-fl...

MODELING A HALL THRUSTER FROM ANODE TO PLUME FAR FIELD AFOSR GRANT FA9550-05-l-0042 lain D. Boyd Department of Aerospace Engineering University of Michigan Ann Arbor, MI 48109-2140 Hall thrusters represent an efficient form of electric propulsion that is being implemented on USAF satellites for station-keeping tasks. Numerical simulation of the plasma flow inside Hall thrusters is playing an in...

A two-dimensional radial-axial hybrid simulation of the xenon-fueled Stanford Hall Thruster has been adapted to model a bismuth-fed thruster with varying channel geometry. The simulation treats the electrons as a quasi-one-dimensional fluid and the neutrals and ions as discrete superparticles advanced using a particle-in-cell (PIC) approach. Since experimental data of the electron cross-field m...