B - Gyros (30/31-05-18)

Question 1

What is movement of gyro orientation called?

Answer 1

Wander

Question 2

What is lateral/horizontal wander called?

Answer 2

Drift

Question 3

What is vertical wander called?

Answer 3

Topple

Question 4

What are gyros mounted on to provide axes of freedom?

Answer 4

Gimbals

Question 5

How many gimbal rings are required to provide full freedom?

Answer 5

2 - 2 degrees of freedom

Question 6

What is real wander?

Answer 6

An actual change in the orientation of a gimbal in space.

Question 7

What causes real wander?

Answer 7

Manufacturing imperfections

Tie systems keeping the gyro in a particular axis (like horizontal to the earths surface)

Question 8

What is apparent wander?

Answer 8

The effect off the rotation of the Earth causes a gyro to seemingly wander due to the observer rotating with the earth.

-ve in the N

+ve in the S

Question 9

What is the equation for wander/earth rate drift?

Answer 9

ERdrift = 15sin(lat)

deg/hr

Question 10

What is the equation for wander/earth rate topple?

Answer 10

ER = 15cos(lat)

deg/hr

Question 11

What is Transport wander?

Answer 11

The wander that occurs due to an aircraft flying over the Earth.

Question 12

What is a space gyro?

Answer 12

A gyro that is not tied on any axes (complete freedom)

Question 13

What is a rate gyro?

Answer 13

A gyro that has 1 gimbal and so only 1 degree of freedom.

the force applied to the gyro from the fixed axis the processes and the rate of wander is measured.

Question 14

What is gimbal lock?

Answer 14

Where 2 gimbal rings align themselves causing a degree of freedom to be lost.

Question 15

What are the 2 types of power sources for a gyro and what are some benefits and drawback to each?

Answer 15

Pneumatic

Easy and cheap but less robust due to particles being able to enter system, and unstable spin speed

Electrical

Can spin faster and be sealed from atmosphere therefore lasting longer, with a stable spin speed