design_final_f

design_final_f - EMFFORCE OPS MANUAL Space Systems Product...

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EMFFORCE OPS MANUAL Space Systems Product Development-Spring 2003 F Coil and Containment Design and Manufacture (MW, JB) F.1 Electromagnet Subsystem Requirement (MW) The electromagnet team is responsible for the design and construction of the electromagnets for the actuation system of each vehicle. The electromagnets will provide the forces and torques necessary for translational movement in the 2-D horizontal plane and for disturbance rejection. To demonstrate the concept of electromagnetic formation flight, the baseline maneuver will consist of a two-vehicle system performing a spin-up maneuver as illustrated by Figure F.1 -A. In this figure, the two vehicles are represented as electromagnet dipoles in an initial perpendicular configuration. As current is applied to the electromagnets, forces and torques are induced as illustrated by the arrows in Figure F.1 -B. Using a reaction wheel, these forces and torques are counteracted such that the dipoles begin to spin-up until they are aligned along a single axis in steady state rotation. Each vehicle will be floated across a smooth surface using compressed gas to reduce friction. Figure F.1 -A: Baseline maneuver. Two-vehicle electromagnet dipole system undergoing spin-up. Figure F.1 -B: Induced forces and torques on two dipoles. Massachusetts Institute of Technology 1 Dept of Aeronautics and Astronautics
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EMFFORCE OPS MANUAL Space Systems Product Development-Spring 2003 The electromagnets must provide the forces and torques required to perform the baseline spin-up maneuver to a constant steady state angular rate of one rotation per minute, or six degrees of arc per second, at a separation distance of two meters measured from each vehicle’s center of mass. The vehicles are required to maintain this rotation rate for a minimum of three rotations. In order to fulfill these actuation system requirements, the electromagnet subsystem team considered several designs for the electromagnet coil. Massachusetts Institute of Technology 2 Dept of Aeronautics and Astronautics
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EMFFORCE OPS MANUAL Space Systems Product Development-Spring 2003 F.2 Design History (MW) The original design for the electromagnet consisted of a ferromagnetic core made of steel wrapped with copper wire to produce the force and torque necessary to fulfill the system requirements. However, since the ability of the system to spin up is dependent upon mass, it is desirable to keep the mass as low as possible. Additionally, since the EMFFORCE satellite test-bed is demonstrating a concept that should be translatable to space application, a large, heavy steel core would not necessarily be the best option due to high launch costs and payload restrictions. A coreless option was then considered. The electromagnet team discarded the steel core and worked on resizing the copper coil
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This note was uploaded on 11/08/2011 for the course AERO 16.810 taught by Professor Olivierdeweck during the Winter '07 term at MIT.

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design_final_f - EMFFORCE OPS MANUAL Space Systems Product...

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