Dynamics and Control Attitude dynamics Communications Pointing

Slides:

Advertisements

Similar presentations

Dr. Andrew Ketsdever Lesson 3 MAE 5595

Advertisements

More Satellite Orbits Introduction to Space Systems and Spacecraft Design Space Systems Design.

Physics Announcements WebAssign – –Chapter 8 and 9 due Wednesday Exam #2 corrections due Wednesday Revised class schedule posted on website Picture:

Sect. 3.12: The Three Body Problem So far: We’ve done the 2 Body Problem. –Central forces only. –Eqtns of motion are integrable. Can write as integrals.

AAE450 Spring 2009 Analysis of Trans-Lunar Spiral Trajectory [Levi Brown] [Mission Ops] February 12,

MAXIM Power Subsystem Diane Yun Vickie Moran NASA/GSFC Code (IMDC) 8/19/99.

Chapter 13 Gravitation.

Gravitation Applications Lecturer: Professor Stephen T. Thornton

The Professional Development Service for Teachers is funded by the Department of Education and Skills under the National Development Plan Weight and mass.

The James Webb Space Telescope. Introduction The James Webb Space Telescope  The James Webb Space Telescope, also called Webb or JWST, is a large, space-based.

Final Review Powerpoint

SNAP Spacecraft Orbit Design Stanford University Matthew Peet.

1.  Antenna is a structure designed for radiating and receiving EM energy in a prescribed manner  Far field region ( the distance where the receiving.

Trigonometric Functions

1 Project Name Solar Sail Project Proposal February 7, 2007 Megan Williams (Team Lead) Eric Blake Jon Braam Raymond Haremza Michael Hiti Kory Jenkins Daniel.

Understand the factors and requirements associated with a spacecraft launch Understand the dynamics of Gravity Assist and the basic principles of placing.

Two Interesting (to me!) Topics Neither topic is in Goldstein. Taken from the undergraduate text by Marion & Thornton. Topic 1: Orbital or Space Dynamics.

Section 7–3: Motion in Space

Newton’s Law of Universal Gravitation

1) What variables affect the force of gravity between two objects? 2) How does Einstein’s Theory of General Relativity Compare to Newton’s Law of Gravity?

Mark Beckman - Flight DynamicsMB-1 Lunar Flight Dynamics Mark Beckman July 12, 2012.

Planetary Motion It’s what really makes the world go around.

Chapter 4 – Gravity, Projectiles, Satellites

Goal: To understand Newton’s 2 nd law and its applications to motions. Objectives: 1)To learn about how accelerations work 2)To understand Newton’s Force.

FAST LOW THRUST TRAJECTORIES FOR THE EXPLORATION OF THE SOLAR SYSTEM

Day Night and Seasons.

Primary Rotations of Asteroid Pairs P. Pravec, D. Vokrouhlický, D. Polishook, A. Harris, A. Galád, O. Vaduvescu, F. Pozo, A. Barr, P. Longa, F. Colas,

Formation Flight, Dynamics Josep Masdemont UPC 10/19/00JMS- 1 Formation Flight, Dynamics Josep Masdemont, UPC.

ADCS Review – Attitude Determination Prof. Der-Ming Ma, Ph.D. Dept. of Aerospace Engineering Tamkang University.

Gravity and Motion. Gravity is what gives the universe its _________ A universal force that acts on _________ the objects in the universe Every particle.

What causes the Seasons?. The Earth’s orbit Seasons do NOT arise from the distance the Earth is from the Sun but rather as a result of the Earth’s annual.

ASEN 5050 SPACEFLIGHT DYNAMICS Interplanetary Prof. Jeffrey S. Parker University of Colorado – Boulder Lecture 29: Interplanetary 1.

Orbital Mechanics Ted Spitzmiller.

Wednesday, Mar. 3, PHYS , Spring 2004 Dr. Andrew Brandt PHYS 1443 – Section 501 Lecture #12 Newton’s Law of Gravitation and Kepler’s Laws.

ORBITAL Orbital Simulation and Telemetric Data Collection Software Developed By: Aaron M. Rosenfeld.

Some problems in the optimization of the LISA orbits Guangyu Li 1 ， Zhaohua Yi 1,2 ， Yan Xia 1 Gerhard Heinzel 3 Oliver Jennrich 4 1 、 Purple Mountain.

Phys211C12 p1 Gravitation Newton’s Law of Universal Gravitation: Every particle attracts every other particle Force is proportional to each mass Force.

Robotics Programming Wall Follow Line tracking for a set amount of time Line tracking for a distance.

Mark Beckman NASA/GSFC Code 595 August 16-17, 2005

Look Angle Determination

Lunar Trajectories.

Goal: To understand Newton’s 2nd law and its applications to motions.

The Inner Planets.

Imagine a ball… Draw the forces acting if: It is at rest on the ground

A Parametric Study of Interplanetary Mission Using Solar Sail

Chapter 12 Gravity.

Starter………. Write a new lesson title: ‘Solar System and Satellites’.

SLS-RFM_14-18 Orbital Considerations For A Lunar Comm Relay

Waves and Water Dynamics

Universal Gravitation

LAUNCH OF GEO STATIONARY SATELLITES

Chapter 5. Optimal Matchings

Chapter 11 Section 2.

Space Exploration SPACE.

Chapter 6: Circular Motion and Gravitation

Flight Dynamics Michael Mesarch Frank Vaughn Marco Concha 08/19/99

10 Projectile Motion Projectile Launched Horizontally

ERV Design Chris Heidelberger Dynamics & Control

Ch. 3 & 4 Vectors, Speed, Velocity, & Acceleration

Natural Sciences Grade 7

Modeling Stars.

Turning Forces and Centre of Gravity

Rigid Body Dynamics ~ f = p h g

Weight and mass T.H. The Professional Development Service for Teachers is funded by the Department of Education and Skills under the National Development.

Devil physics The baddest class on campus IB Physics

on the winter solstice, the sun doesn't rise at the arctic circle

Chapter 13 Gravitation.

Universal Gravitation

PLANETARY MOTION.

Presentation transcript:

Dynamics and Control Attitude dynamics Communications Pointing Chris Heidelberger Dynamics and Control Attitude dynamics Communications Pointing Thermal considerations

Attitude Dynamics Assumptions: -circular orbit (will be changed) -translation not affected by orientation -axially symmetric body Nominal motion is stable Large 5 degree perturbation is still stable. Without maneuver, near inertially fixed orientation throughout orbit.

Orientation Assuming fully extended tether and no influence from Earth or Mars. May want to wait a few days after Earth launch until deploying the tether. Similarly, reel in tether a few days before Mars arrival

Communications Pointing Need dish to “follow” Earth for high bandwidth antenna. Will a motor be able to move fast enough and precisely enough? Will there be any black out periods during transfer? Will there be a need for a maneuver to maintain pointing? Drawn by Chris Heidelberger

Setup of Problem Orbital mechanics will tell us what W and w will be at any point in time. b now known. Distance from Sun to Earth and spacecraft also known for any point in time. Drawn by Chris Heidelberger

Setup, part 2 a, b, b, a, L known. Can find c and e from law of cosines. With e, can find z z and a will add to f Drawn by Chris Heidelberger

Setup, part 3 C, L, and f known. Use law of cosines to find Y and g. g is the final answer needed. Matlab code to find g as a function of time and range of g. Drawn by Chris Heidelberger

Pointing during transfer During 180 day transfer, no black out periods. During free return there doesn’t appear to be any, either (needs analysis). There doesn’t appear to be large angles for pointing. Further analysis needed after code is written.

Communications Conclusions Dish size will determine max range of pointing angle. This will determine whether a maneuver will be needed to maintain pointing. 3-d motor needed to spin dish. Rate will be determined after analysis. No black out periods during 180 day transfer.

Thermal Considerations Use similar methods to find percentage of time each part of the vehicle is exposed to the Sun and at what angles. This can be used to selectively place shielding and structures, lowering weight by not using full coverage when it isn’t needed. Sensitive objects can also be placed in low exposure areas.