Abstract
Fiber Optic Gyroscope (FOG) is a new type of rotation sensor that plays an important role in navigation and guidance system. As the sense element of FOG, the fiber coil (FOC) performance directly affects the FOG measurement precision. Many factors influence the quality of FOC, ideal structure and constant small tension control in the winding process were key factors. In order to prevent FOC edge defect, we proposed piecewise variable speed winding method to make regular FOC structure more accessible. In view of the shortage of the common control method used in FOC winding, we optimized fuzzy PID by introducing domain adjusting factors and designed a new tension controller based on mechanical analysis. The optimization controller can adaptively adjust the control factors to ideal settings and ensure constant tension throughout all variable winding speeds stages even in the present of complex external disturbance. Comparative experiments shown that the new controller has a higher accuracy and better robustness than commonly used controller.
Highlights
Sagnac found that two beams of light splitting by one source are made to follow in opposite directions a loop trajectory that constitutes a ring and an interference pattern is obtained [1]
fiber optic gyroscopes (FOG) relies on light travelling through a light path of several hundreds or thousands of meters defined by the fiber optic coil (FOC) which is the heart of the FOG [2]
Ge et al.: Constant Small Tension Control for Fiber Optic Coil Variable-Velocity Winding deviation is large, the regulatory factors automatically adjust to large values, so the control parameters can search optimal values in a larger range, which makes the system rapidly converge to the steady state
Summary
Sagnac found that two beams of light splitting by one source are made to follow in opposite directions a loop trajectory that constitutes a ring and an interference pattern is obtained [1]. In the FOC winding process, additional stress brought to the optical fiber will change the light propagation state and affect the output stability [3]. Tension control algorithm includes common PID control [4], Fuzzy-PID control [5], and Feedback-Feedforward control [6] These traditional methods can’t eliminate nonlinear tension oscillation. In order to meet the increasing requirements of navigational system, the real timing and precision of tension control during FOC winding need to be improved. S. Ge et al.: Constant Small Tension Control for Fiber Optic Coil Variable-Velocity Winding deviation is large, the regulatory factors automatically adjust to large values, so the control parameters can search optimal values in a larger range, which makes the system rapidly converge to the steady state. The response time and steady-state performance of the FOC control system were improved
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