Structural modifications in optomechanical systems for vibration reduction by using sequential model updating method

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2020-8

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Camcı, Mustafa Sezer

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It is required to have high image performance in optomechanical systems working under excessive vibrations. If optical elements in an optomechanical system cannot be stabilized sufficiently, image problems (blurring, jitter, etc.) can arise due to excessive vibrations. The motivation of this thesis is to increase the optical performance of an optomechanical system which is exposed to high vibration levels coming from the platform. In order to eliminate high vibrations affecting the optical element of an optomechanical system, design modifications can be made, which requires a reliable mathematical model of the system. In this thesis, a new approach, which is named Sequential Model Updating Method, is developed and used for modeling and updating the FE model of an optomechanical system simultaneously, since the methods in the literature are found to be inadequate for systems composed of not only substructures, but also several moving parts. In this method, modelling and model updating are carried out sequentially. Initially, one component is modeled and updated by adjusting some parameters of the component. Afterwards, a new subsystem is added to the system, and the resulting model is updated by changing some parameters of the newly added subassembly only, using the experimental results for that subsystem. The procedure is repeated until the FE model of the complete system is obtained. Using the updated FE model, structural modifications on a selected part can be carried out to eliminate the undesired vibrations. The application of the method developed for model updating, and the structural modification of a selected part to minimize vibrations of the optical element are shown on a problematic optomechanical system. The results obtained show the performance of the method developed.

Subject Keywords

Model Updating Of Complex Systems, Structural Modifications, Design Optimization, Optomechanical System Performance, Finite Element

URI

https://hdl.handle.net/11511/69242

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. S. Camcı, “Structural modifications in optomechanical systems for vibration reduction by using sequential model updating method,” M.S. - Master of Science, Middle East Technical University, 2020.