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SIX DEGREES OF FREEDOM(6DOF) The six degrees of freedom: forward/back, up/down, left/right, yaw, pitch, roll 6DoF refers to the freedom of movement of a  rigid body  in  three-dimensional space . Specifically, the body is free to change  position  as forward/backward, up/down , left/right  translation in three  perpendicular   axes combined with changes   in  orientation   through  rotation  about three perpendicular axes, often termed yaw , pitch, and roll.    Six degree of freedom consists of the following movement: Translation – Moving along the different axes X, Y and Z Moving up and down along the Y axis is called heaving. Moving forwards and backwards along the X axis is called surging. Moving left and right along the Z axis is called swaying. Rotation – Turning in order to face a different axis Moving between X and Y is ca...

     EXPERIMENT ON TORSIONAL VIBRATION OF A   DOUBLE ROTOR SHAFT AIM :: To study the torsional vibration of two rotor shaft system. APPARATUS :: Vibration test rig , vernier caliper, two rotor shaft , scale, stopwatch… THEORY ::   A rotor shaft system consists of a shaft with two rotors at both ends each, both rotor may rotate in the opposite direction [two rotors A&B having mass moment of inertia &   the rotor A&B are converted at the end with shaft having stiffness ‘K’]                        PROCEDURE ::   ·          Shaft is fixed at the two ends to the rotor with the help of chucks ·          One rotor is rotated at clockwise direction and another is rotated at anticlockwise direction . ·       ...

EXPERIMENT ON TORSIONAL VIBRATION OF A SINGLE ROTOR SHAFT AIM :: To study the torsional vibration of single rotor shaft system. APPARATUS :: Vibration test rig , vernier caliper , scale, stopwatch… THEORY :: When the particles of the shaft or disc moves in a circle about the axis of the shaft  i.e if the shaft gets alternatively twisted and untwisted on amount of vibratory system then the vibrations are known as torsional vibrations consider a shaft of negligible weights fixed at one end of and carries a rotor on the free end the amplitude of torsional vibration is maximum at the force end i.e at B and zero at fixed end i.e at A the point of section at the shaft whose amplitude of torsional vibration is zero . Torsion of circular shaft :           Mt/J = J/R = Gθ                         ...