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Gyrocompass

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A GYROCOMPASS IS A NON-MAGNETIC COMPASS USED FOR NAVIGATION AND STABILIZATION

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Gyrocompass

  1. 1. By Gokul Lakshmanan
  2. 2.  Introduction.  Objective.  Working principle.  Purpose.  Cost of production.  Conclusion.  Reference.
  3. 3.  Gyrocompass is a type of non-magnetic compass.  One important component of a gyrocompass is a gyroscope, but these are not the same devices.
  4. 4.  To construct a Gyrocompass.
  5. 5.  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.
  6. 6. BASIC COMPONENTS
  7. 7. a) For Navigation b) To Stabilize Airplane and Ship
  8. 8.  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
  9. 9. A marine gyrocompass
  10. 10.  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.
  11. 11. 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.
  12. 12. 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.
  13. 13.  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.
  14. 14.  For a rotating gyro with mass ‘M’ and radius ‘r’.  Angular momentum is given by:퐿 = 푀 ∗ 푣 ∗ 푟  Where ‘푣’ 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.
  15. 15. 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
  16. 16. A 3-axis Gimbal gyrocompass is constructed and is tested for accuracy.
  17. 17.  Gyrocompass - Wikipedia, the free encyclopedia  Gimbal - Wikipedia, the free encyclopedia  YOUTUBE: MIT Open Course Ware Lec. 24 | 8.01 Physics I: Classical Mechanics, Fall 1999

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