# Presentation: 551210

## Methods of Dust Mitigation with Applications to Lunar and Martian Missions

**Methods of Dust Mitigation with Applications to Lunar and Martian Missions**

**Jordan Wirfs-Brock**
**Mentor: Dr. Juan Agui, Microgravity Division**

## Motivation

**Motivation**

**Why do we care about dust?**
**Mechanical problems**
**Electrostatic problems**
**Health problems**
**What is special about Lunar dust?**
**What is special about Martian dust?**
**Can dust be useful?**

## Project 1: Abrasion Testing of an Electrostatic Coating

**Project 1: Abrasion Testing of an Electrostatic Coating**

**What exactly are we trying to test?**
**- How does this relate to the applications?**
**Experimental questions/issues**
**- What conditions are we trying to simulate?**
**- Duration of corrosion**

**Why an electrostatic coating?**

## Main Components

**Main Components**
**Translating Stage**
**Displacement Sensor**
**Flat leaf spring**

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Initial Design

**Initial Design**

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Final Design

**Final Design**

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Project 1: Abrasion Testing of an Electrostatic Coating

**Deflection of the spring => relative motion between the test-slide and the translating stage/sensor**
**Relative motion => force balance => frictional force felt by the slide**

- Displacement
-  sensor

- Displacement sensor

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Displacement sensor calibration, 0.001” thick target

- Displacement (m)

- Sensor Voltage (V)

- 10th order best-fit curve

**Displacement sensor calibration, 0.001” thick target**

- f(x) = 0.0032115x10 – 0.0062041x9 – 0.0029192x8 + 0.0014434x7 + 0.0040341x6 + 0.0048883x5 + 0.0046574x4 + 0.003932x3 + 0.0030839x2 + 0.0023046x + 0.0016687

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Project 1: Abrasion Testing of an Electrostatic Coating

**Project 1: Abrasion Testing of an Electrostatic Coating**

- Translating stage calibration
- Procedure: Dial indicator
- Results: Inconsistent step size
- Problems: Dial indicator problems, resolution of measurements
- Flat leaf spring calibration
- Procedure: Loading with known masses
- Results: Inconsistent spring constants
- Problems: Deflections too small to be measured accurately

## Project 1: Abrasion Testing of an Electrostatic Coating

**Control Data (no sample)**

**Un-coated glass sample**

- Pre-motion

- Motion

- Post-motion

**Coefficient of static friction**

**Coefficient of dynamic friction**

- Time (s)

- Output voltage (V)

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Project 1: Abrasion Testing of an Electrostatic Coating

- Did the experimental set-up work? Yes and no...
- Functions mechanically (springs yield displacements within measurable range)
- Back-calculated friction coefficients for glass on glass do not match known values
- Possible explanations: spring not linear, calibration errors

- Translating stage

- Displacement sensor

- Flat leaf spring

- Coated slide

- Glass base

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Project 1: Abrasion Testing of an Electrostatic Coating

**Continuation of abrasion testing...**

**Project 1: Abrasion Testing of an Electrostatic Coating**

## Project 2: Modeling Dust Dynamics

**Project 2: Modeling Dust Dynamics**

**Physical problem/model**
**Extracting oxygen from lunar dust by shaking and heating**
**How can we model that simply?**
**Software capabilities**
**PFC3D**
**What happens when you put the two together?**
**Is this software able to demonstrate states observed in real life?**
**Is this software a useful tool for analyzing this heating method?**

## Simulation views and geometry:

**Simulation views and geometry:**
**-Cylinder with 5 cm diameter**
**-Hard spheres with 3 mm diameters**
**-Between 700 and 6000 particles**

## Project 2: Modeling Dust Dynamics

**Project 2: Modeling Dust Dynamics**

**Observations and concerns**
**Long computing time (~20 hours for 1/6 of a second)**
**What are the starting conditions?**
**Will convection occur?**
**Are material properties of glass beads appropriate? How to model lunar regolith?**
**Amplitude of oscillations**
**Problems with the software**
**Unexplainable compaction**
**Abnormal/unrealistic physical behavior**

## Project 2: Modeling Dust Dynamics

**Physically unrealistic behavior, side view**

**Project 2: Modeling Dust Dynamics**

## Project 2: Modeling Dust Dynamics

**Physically unrealistic behavior, top view**

**Project 2: Modeling Dust Dynamics**

## Project 2: Modeling Dust Dynamics

**Project 2: Modeling Dust Dynamics**

**Is PFC3D software useful to this application? Here’s my take...**

## Where do we go from here?

**Where do we go from here?**

**Continuation of projects mentioned**
**Future projects**
**Vacuum chamber for dust impact dynamics**
**Dust flow in vacuum**

## Acknowledgements

**Acknowledgements**

**Dr. Juan Agui**
**Dr. M. David Kankam and the University Programs Office**
**Dr. Paul Hambourger (CSU)**
**Dr Suleyman Gokoglu **
**Nasser Rashidnia **
**Oregon Space Grant**