CRICOS No. 00213Ja university for the worldrealR

ENB443-2009: Review

• Overview:– Review of unit– Hints about final exam.

CRICOS No. 00213Ja university for the worldrealR

From 1st Lecture:Why Study Space Technology?

• More than space/scientific exploration.– “The number of applications based on information

coming from spacecraft has significantly increased over the last decade”.

– We will focus on earth satellite technology.– Civilian and commercial application.

We now understand this..

CRICOS No. 00213Ja university for the worldrealR

From 1st Lecture: Satellite as a system!

• High level mission objectives are the entire reason a satellite is launched.

• A satellite is a complex (interconnected) system designed to deliver and support a payload and a mission.

• Viewed as a system of systems, or various sub-systems interacting to deliver an objective.– Interfaces/interconnections are very important.

We now understand this..

CRICOS No. 00213Ja university for the worldrealR

From 1st Lecture: What we will cover

• Time references and co-ordinate systems.• Orbital dynamics, equations of motion, Kepler,

perturbations, propagation, etc.• Satellite technology: (sub-systems)

– Structure, power, communication, thermal control, propulsion, attitude dynamics and control.

• Delivery technology: launchers, rockets, staging, and trajectories.

• Applications and outlook for the future.We covered this..

CRICOS No. 00213Ja university for the worldrealR

From 1st Lecture: Where will you reach in this course?

• You will be able to mathematical and numerically model satellite orbits (and rocket trajectories).

• Understand satellites/rockets as systems (and sub-systems).

• You will be able to evaluate mission objectives and their impact on design decisions.

You did this and reached this understanding..

CRICOS No. 00213Ja university for the worldrealR

Final Exam

• Worth 50% of your final mark.• This year’s exam will focus on:

– Student knowledge of :• satellite and rocket systems, • time/coordinate systems and • satellite subsystem design decisions and their impact.

– Student capability to:• Apply discipline knowledge to relevant problems.• Solve problems using this knowledge.

CRICOS No. 00213Ja university for the worldrealR

Final Exam

• 2 hours length:– 7 questions.– Questions worth different marks (between 6 and 14

marks). – 60 marks available on the exam.

• 30% on Orbit Dynamics• 40% on Sub-systems• 30% on Rocket Dynamics

• Some number questions (you must bring a calculator).

CRICOS No. 00213Ja university for the worldrealR

Suggested Study Activities• Have a look at previous exams

– Note, this year the exam is 2hr long, so 2/3 the 2006 year’s exam.– 2006 exam is an o.k. guide.

• But this year exam is slightly longer, and harder.– Do the questions.

• Understand the basic rocket equation, rocket staging, etc. This material makes good exam questions. Make sure you can repeat the proofs, and do sample questions.

• Be sure to understand: – Time and co-ordinate systems.– Orbits, Kepler’s laws, and their proofs. – Satellite as a system.– Solar panel energy balance concepts, thermal flux equations (equilibrium).– Satellite attitude dynamics (how to construct angular rotation matrices, torque).– Rocket dynamics, delta V, staging, proofs, etc.

• Covers everything except: Orbit propagation.

CRICOS No. 00213Ja university for the worldrealR

Exam Practice.• I have prepared some practice questions, of similar

difficulty/length.– Available on Blackboard.– Includes answers for most questions.– And a few bonus/extra questions for practice.– I recommend doing all your preparation, then try the practice

questions. Then re-read material related to questions you couldn’t answer.

• I’ve post a copy of formula sheet similar to the formula sheet in the exam– Contains un-required formula, – NOTE: extra formula are provided in exam.– SO: don’t scope your study based on that sheet.

• Getting 100% in the final exam should be possible.• It should be difficult to fail this exam (if you study).