6. Gyrocompass consist of a spinning wheel
mounted on gimbal so that the wheel's axis is
free to orient itself in any way.
When it is spun with its axis pointing in some
direction, such a wheel will maintain its axis of
rotation.
A gimbal is constructed in such a way that no
external torque acts on the axis of rotation of
gyro.
10. For assisting navigation the axis of rotation of
gyro is aligned to point towards the
geographical north.
Since no external torque acts on the axis of
rotation the gyro will always point towards
geographical north irrespective of the motion
of ship
12. A Gyrocompass is mounted on Airplane or Ship.
Variation in alignment of gimbal frame w.r.t axis
of rotation of gyro is used judge the amount of
pitch, roll and yaw experienced by Airplane or
ship.
The degree of pitch , yaw or roll experienced by
the ship is measured and converted into electrical
signal by a transducer which is then send to the
pilot or captain of the ship.
13.
14. Advantages: Disadvantages
Seeks geographic (true) north
instead of magnetic.
Gimbal lock occur when two axis
align parallel to each other.
Can be used near the earth’s
magnetic poles, where magnetic
compass is useless.
Requires a constant source of
electrical power and is sensitive to
power fluctuations.
Unaffected by surrounding
metals.
Requires periodic maintenance by
qualified technicians.
15. COMPONENT SPECIFICATIONS
DISC
a. DIAMETER = 178.8 mm.
b. MASS = 1.5 kg.
BALL BEARING
a. DIAMETER = 19.5 mm.
b. Nos. = 6
PIPE (G I)
a. DIAMETER = 19.5 mm.
b. LENGTH = 6 m.
16. Make a 3 axis gimbal and provide necessary
joints to mount the gyro.
Attach the gyro to the gimbal and provide
sufficient rpm
Align the gyro axis pointing a specific
direction, say North.
Test the instrument by providing torque on
frames of gimbal.
17.
18.
19. For a rotating gyro with mass ‘M’ and radius
‘r’.
Angular momentum is given by:𝐿 = 𝑀 ∗ 𝑣 ∗ 𝑟
Where ‘𝑣’ is the tangential velocity of gyro.
The value of angular momentum should be
large enough to oppose any torque which the
gyro experience due to self-weight.
20. Component Specification Cost (Rupees)
Bearing 6.nos 300
Disc 1 100
G I Pipe 6meters 440
Nuts and Bolts 8.nos 30
Transportation 200
Paint 3 Bottles 278
TOTAL 1348
21. A 3-axis Gimbal gyrocompass is constructed and
is tested for accuracy.
22.
23. *Demonstrates the basic of
the gyro-compass and
explains how to minimize
settling time by slewing
and leveling it to the
correct heading
26. Lists the settings to be made or adjusted while
the compass is in use
Explains how the repeater system is switched
on and aligned with the master gyro- compass
Describes how gyro heading input