When does a gimbal lock occur on a three axis platform?(a) Inner gimbal approaches 90°(b) Inner gimbal approaches 0°(c) Outer gimbal approaches 90°(d) Middle gimbal approaches 90°The question was asked by my school teacher while I was bunking the class.My question is based upon Strap Down and Gimballed Inertial Navigation Systems in chapter Satellite Radio Navigation& Inertial Navigation of Avionics

When does a gimbal lock occur on a three axis platform?(a) Inner gimba

1.	When does a gimbal lock occur on a three axis platform?(a) Inner gimbal approaches 90°(b) Inner gimbal approaches 0°(c) Outer gimbal approaches 90°(d) Middle gimbal approaches 90°The question was asked by my school teacher while I was bunking the class.My question is based upon Strap Down and Gimballed Inertial Navigation Systems in chapter Satellite Radio Navigation& Inertial Navigation of Avionics
Answer» The correct ANSWER is (d) Middle gimbal APPROACHES 90° To elaborate: The condition in which the middle gimbal ANGLE approaches 90° is CALLED gimbal lock. In this condition, the innermost and outermost axis coincide, thus depriving the platform one of its degrees of freedom.

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