gyro

1. By:Group11

2.  Introduction.
 Objective.
 Working principle.
 Purpose.
 Cost of production.
 Conclusion.
 Reference.

4.  Gyrocompass is a type of non-magnetic
compass.
 One important component of a gyrocompass is
a gyroscope, but these are not the same
devices.

5.  To construct a Gyrocompass.

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.

8. BASIC COMPONENTS

9. a) For Navigation
b) To Stabilize Airplane and Ship

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

11. A marine gyrocompass

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.

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.

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.

23. *Demonstrates the basic of
the gyro-compass and
explains how to minimize
settling time by slewing
and leveling it to the
correct heading

25. *Explains the necessary
time for the compass to
settle after switching on
prior to sailing

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