When the Gyro rotor is spinning,it maintain its plane of rotation fixed in space,but there is no definite attitude in space which the gyro will naturally assume. Therefore if the Gyro is to be used as reference it must be controlled ,so that the Gyro asssumes a definite attitude either in space or relative to the earth,after which it will be stabilised by its own inertia.
So on the basis of this controlling force & degree of freedom there are different types of Gyro.
1.Free Gyro- A gyro having complete freedom in three planes at right angle to each other.This is also known as Space Gyro.
2.Tied Gyro- A Gyro having freedom in three planes at right angle to each other but controlled by some external force.
e.g.- Directional Gyro, which has its axis of rotation maintained in a plane at right angles to the outer gimble ring.
3.Earth Gyro- A Tied gyro controlled by gravity to maintain its position relative to the earth.
e.g- Gyro Horizon,which has its axis of rotation maintained in a vertical position relative to the earth's surface by a pendulum control.
4.Rate Gyro-A gyro having one plane of freedom at right angles to the plane of rotation ,so constructed as to measure rate of movement about the planes at right angles to both the plane of rotation & the plane of freedom.
e.g.- Turn co-ordinator.
Comments
Post a Comment