nro2_200205

nro2_200205 - Electromagnetic Formation Flight...

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Unformatted text preview: Electromagnetic Formation Flight NRO-000-02-C0387-CLIN0001 MIT Space Systems Laboratory 1 Electromagnetic Formation Flight Progress Report: May 2002 Submitted to: Lt. Col. John Comtois Technical Scientific Officer National Reconnaissance Office Contract Number: NRO-000-02-C0387-CLIN0001 MIT WBS Element: 6893087 Submitted by: Prof. David W. Miller Space Systems Laboratory Massachusetts Institute of Technology Electromagnetic Formation Flight NRO-000-02-C0387-CLIN0001 MIT Space Systems Laboratory 2 D ESCRIPTION OF THE E FFORT The Massachusetts Institute of Technology Space Systems Lab (SSL) and the Lockheed Martin Advanced Technology Center (ATC) are collaborating to explore the potential for a Electro-Magnetic Formation Flight (EMFF) system applicable to Earth-orbiting satellites flying in close formation. P ROGRESS O VERVIEW At MIT, work on electro-magnetic formation flight (EMFF) has been pursued on two fronts: the MIT conceive, design, implement and operate (CDIO) class, and the MIT Space Systems Lab research group, as described in the April 2002 progress report. The CDIO class has just completed its first semester performing trades on and preliminary design of a six-degree-of-freedom electromagnetic formation flight testbed, called ElectroMagnetic Formation Flight of Rotating Clustered Entities, or EMFFORCE. EMFFORCE will utilize electromagnets to control the size and attitude of a cluster of bodies. The MIT Space Systems Lab research staff is supporting the CDIO class with both hardware and software analysis and design. Recent work has focused on the design and analysis of a control system for the EMFFORCE testbed. Specifically, three testbed modes have been considered: Spin-up of multiple bodies from rest Steady-state spin of multiple bodies, ensuring:- Operation at a fixed cluster radius- Disturbance rejection Spin-down of multiple bodies from steady-state spin. Analysis shows the steady-state spin mode to be unstable, yet controllable with either simple PID control or more optimal state-space control methods. Further, a one-degree-of- freedom air-track system is identified to have unstable dynamics almost identical to the dynamics of a spinning cluster; hence demonstrating control on the air track system will be considered a positive step toward demonstrating control on the spinning system. The following report summarizes recent progress on the control analysis and design for the first two configurations. The third configuration will be treated similarly to the first, but with a reversed algorithm. Electromagnetic Formation Flight NRO-000-02-C0387-CLIN0001 MIT Space Systems Laboratory 3 Preliminary Control Design For the Electromagnetic Formation Flight of Rotating Clustered Entities (EMFFORCE) Testbed in the MIT Space Systems Laboratory 1 Subsystem Overview Figure 1.1 Control Subsystem Flow Chart The control subsystem, a computer program located within the avionics processor, takes state inputs from the metrology subsystem and compares the current state with the desired state. It then outputsfrom the metrology subsystem and compares the current state with the desired state....
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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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nro2_200205 - Electromagnetic Formation Flight...

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