Decomposition Method of Coupling Angular Motion for the Damped Optical Fiber Inertial Measurement System

A method for analyzing and calculating the offset between the elastic center and the center of mass, based on inertial sensor output signals, is proposed to address the problem of vibration-induced coupled angular motion in inertial measurement units. First, the spatial six-degree-of-freedom vibration differential equations of the inertial system are derived, and an approximate decomposition approach for analyzing the six-degree-of-freedom model is introduced. Subsequently, based on practical engineering considerations, the rationality of the proposed decomposition method is verified using numerical simulation and finite element analysis software, and the relationship between the offset distance and the coupled angular velocity is further investigated.