Dynamical analysis of the fiber optic coils through multiscale numerical modeling and modal tests

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2022-4-28

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Kahveci, Özkan

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Fiber optic gyroscopes (FOGs) are common rotation measurement devices in aerospace applications. They have a wide range of diversity in length and winding radius of coils to meet the system requirements. Every dimensional parameter in the coil influences the dynamic response of the system, which eventually leads to measurement errors. In order to eliminate the errors and qualify the system, after the design and production stages, a deep and comprehensive testing procedure follows. In this study, the dynamic behavior of a quadrupole winded fiber optic coil is investigated. Firstly, a set of fiber optic coils are tested with an impact modal test, where mode shapes and natural frequencies are determined with structural data acquisition. For the modal analysis, a finite element (FE) model is developed where a representative volume element (RVE) analysis is also included to consider the influence of the microstructure properly. The experimental and numerical results are compared and validated. Moreover, an estimation model is proposed for a type of coil with different fiber length. Finally, the latter coil set is produced and tested employing the same methodology in order to illustrate the capacity of the developed framework.

Subject Keywords

Fiber optic gyroscope, Fiber optic coil, Modal test, Modal analysis, Finite element method

URI

https://hdl.handle.net/11511/97316

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ö. Kahveci, “Dynamical analysis of the fiber optic coils through multiscale numerical modeling and modal tests,” M.S. - Master of Science, Middle East Technical University, 2022.