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from __future__ import graduation

Welcome

Development of a Modular Application for Analyzing Observer-Based Control Systems for NASA's Spin-Stabilized MMS Mission Spacecraft

UNH Mechanical Engineering - MS Thesis Defense

Daniel R. Couture

Prof. May-Win Thein

May 1st, 2014

Kingsbury Hall, W290

Thank You

Prof. Thein
Prof. Fussell, Prof. Hatcher
Heather

Tracey Harvey
NASA Goddard MMS ADCS team
NH Space Grant Consortium
Dyn Inc
Newmarket School District
Former (and future) Students
Coffee

Lesson Plan

What is MMS?
The Question
My Work
- "Cool" Things Learned
Questions
- (No hard questions, please)

What is MMS?

Magnetospheric Multiscale Mission - Magnetic Reconnection

Neil Mushaweh (2005 UNH ME)

Simulated Boom Dynamics
Marc Mentat
- Excellent FEA modeling
- Limited $< 90$ degree rotations
MATLAB/Simulink
- Goto for control systems
- Don't have a model for the boom dynamics

The Question

UNH NASA MMS TableSat IA

TableSat/MMS

Limited 3-DOF Motion
4 Spin-plane Double Probe (SDP) Booms
1 Axial Double Probe (SDP) Booms

Sensors

Single Axis Gyro
Accelerometers
Coarse Sun Sensor
Three-Axis Magnetometer

Actuators

2 Rotational Fans (1 CW, 1 CCW)
2 Nutation Fans (1 Mx, 1 My)

Thesis Goals

Experimental Results

$\omega_z = 3$ rpm
Nutation Control
Boom Dynamics Analysis

Supporting Goals

ADCS $f(\boldsymbol{V}_{\text{sensors}}) = \boldsymbol{V}_{\text{actuators}}$

Thesis Goals - Results Assessments

Experimental Goals

$\omega_z = 3$ rpm
A
Nutation Control
C
Boom Dynamics Analysis
F

Supporting Goals

ADCS $f(\boldsymbol{V}_{\text{sensors}}) = \boldsymbol{V}_{\text{actuators}}$
A

Experimental Goal: $\omega_z = 3$ rpm

$$M_z(k) = K_p \omega_{e}(k) + K_i \sum^k_0 \omega_{e}(k) + K_d [\omega_{e}(k) - \omega_{e}(k-1) ] \\ \omega_{e} = \omega_{z} - \omega_{zd}$$

Rate Control Proof (8/15/2008)

Voltages to State - CSS

$$\begin{align} V_{css\_x} &= \sum\limits_{i=1}^6 (V_{css\_i} - V_{css\_base}) \cos \left( \frac{2\pi}{6} (i-1)\right) \\ V_{css\_y} &= \sum\limits_{i=1}^6 (V_{css\_i} - V_{css\_base}) \sin \left( \frac{2\pi}{6} (i-1)\right) \\ \psi &= \tan^{-1} \frac{V_{css\_y}}{V_{css\_x}} \end{align}$$

Voltages to State - Three-Axis Magnetometer

Measure Nutation from the TAM

Nutation Control

Boom Dynamics Analysis

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2008 to Now?

$f(\boldsymbol{V}_{\text{sensors}}) = \boldsymbol{V}_{\text{actuators}}$