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Contribution to the study of damping in bolted structures

Abstract : Bolted structures dynamics is an ongoing research topic. In particular, a correct prediction of the damping provided by bolted joints has became an essential requirement for a certain number of applications, such as aircrafts and space vehicles. In fact, for these applications, the use of materials with higher damping coefficients is limited by environmental conditions.This work provides two main contributions. The first one concerns the design and modeling phase, with the creation of a finite element connectors' system, that reproduces the bolted joint normal and tangential behaviors. The latter is accomplished only by taking into account readily available physical data, such as the bolted joint dimensions and the properties of the surfaces in contact. The second contribution regards the evaluation of assembled structures' nonlinear dynamic properties. A set of post-processing tools making use of the Kalman filter is developed to perform a nonlinear modal analysis for the most common types of experimental tests: impact hammer tests, sweep sine tests, and random vibration tests.The developed methods are then applied and evaluated on a real bolted structure, pointing out advantages and drawbacks. In particular, the Kalman filter allows for a higher accuracy in the determination of modal parameters, but the filter initialization is the main problem. A partial automation of the initialization task is provided, together with practical tips thanks to the experience gained on the subject.
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Submitted on : Thursday, October 31, 2019 - 10:31:18 AM
Last modification on : Friday, May 29, 2020 - 4:36:58 AM
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  • HAL Id : tel-02340994, version 1

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Marco Rosatello. Contribution to the study of damping in bolted structures. Mechanics of the solides [physics.class-ph]. Université Paris-Saclay, 2019. English. ⟨NNT : 2019SACLC049⟩. ⟨tel-02340994⟩

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