gimbal lock
（ plural ）
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The loss of one degree of freedom in the three-dimensional rotational movement of a three-gimbal mechanism, which occurs when the axes of two of the three gimbals are driven into a parallel configuration, so that the system's rotational movement becomes two-dimensional (and necessarily remains so until an appropriate force is applied); the equivalent situation in a simulation of rotational movement, when the mathematical model uses Euler angles (representing pitch, yaw and roll) or their equivalent.
gimbal lock
When the two inner gimbals aligned and restricted rotation, the spacecraft's attitude control encountered gimbal lock, losing one degree of rotational freedom until an external torque was applied.
When the two inner gimbals aligned and restricted rotation, the spacecraft's attitude control encountered gimbal lock, losing one degree of rotational freedom until an external torque was applied.
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