# modevoe

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Category: Education

## Presentation Description

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## Presentation Transcript

### Slide1:

Aerobraking Mollie Devoe Wells College

### Agenda:

Agenda What is Aerobraking? How Aerobraking works Aerobraking Simulation Results Program’s future

### Setting the Stage:

Setting the Stage

### Slide4:

What is Aerobraking? Aerobraking is a technique to transform an elliptical orbit into a circular orbit Aerobraking exploits a planets atmosphere to perform a controlled drag maneuver.

### Slide5:

How Aerobraking Works Atmospheric molecules strike the spacecraft transferring energy and momentum. The momentum transfer creates drag which aerobrakes the spacecraft.

### Slide8:

Types of Aerobraking Single-Pass Multi-Pass

### Slide9:

Phase 1: Walk-in Propulsive maneuvers gradually drop the spacecraft’s periapsis This allows evaluation of the vehicle’s response to the new environment in gradually increasing levels

### Slide10:

Phase 2: Main Phase A series of small propulsive maneuvers keep periapsis in control corridor

### Slide11:

Phase 3: Endgame Desired circular orbit is met Propulsive maneuvers raise periapsis out of atmosphere to stop aerobraking

### Project Goals:

Project Goals To understand orbital mechanics -calculate an orbit from initial conditions -understand the effects of drag Build a program that simulates aerobraking

### About the Program:

About the Program Application parameters -planet mass, planet radius, spacecraft mass, time lapse… Current position -x, y, r, theta, velocity, net force... Updates current position, including total energy and angular momentum

### Two Dimensional Integration:

Two Dimensional Integration Choose coordinate system -Origin at planet’s center Position is a function of x and y:

### Slide15:

Velocity at Specific Position

### Therefore the New Position After dt is...:

Therefore the New Position After dt is... In x direction:

### What About the Change in Velocity?:

What About the Change in Velocity?

### The New Velocity After dt is...:

The New Velocity After dt is...

### Running the Program:

Running the Program Simulations run with the following initial velocities: - 0 m/s - 1200 m/s - 1250 m/s - 1275 m/s - 1280 m/s - 1300 m/s

A Closer Look...

### Slide28:

The Program’s Future Run more simulations to gain a better understanding of drag Three dimensional integration Apply to other planets

### Acknowledgments:

Acknowledgments Professor Scott Heinekamp Professor Carol Shilepsky Frank Lacomb