Dissertation/ Thesis
Multi-stable non-linear dynamic absorbers ; Les absorbeurs dynamiques non linéaires multi-stables.
العنوان: | Multi-stable non-linear dynamic absorbers ; Les absorbeurs dynamiques non linéaires multi-stables. |
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المؤلفون: | Bouzid, Islem |
المساهمون: | Laboratoire de Mécanique et d'Acoustique Marseille (LMA), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Ecole Centrale Marseille, École nationale d'ingénieurs de Sfax (Tunisie), Pierre-Olivier Mattei, Tahar Fakhfakh |
المصدر: | https://theses.hal.science/tel-04805769 ; Acoustique [physics.class-ph]. Ecole Centrale Marseille; École nationale d'ingénieurs de Sfax (Tunisie), 2023. Français. ⟨NNT : 2023ECDM0006⟩. |
بيانات النشر: | CCSD |
سنة النشر: | 2023 |
المجموعة: | Aix-Marseille Université: HAL |
مصطلحات موضوعية: | Non-Linear, Multi-Stable, Energy pumping, Non linéaire, Pompage énergétique, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] |
الوصف: | This work focuses on a nonlinear vibroacoustic absorber system with nonlinear damping, consisting of a thin circular membrane. It was developed with the aim of controlling noise in an acoustic environment constituted by the first mode of vibration of a tube open at both ends. The main objective of this thesis is twofold: first, to master the modeling of these absorbers, and second, to extend their range of effectiveness by introducing a new solution for a nonlinear bistable vibroacoustic absorber.In order to master the modeling of these absorbers, an identification method is first developed, that allows the estimation of parameter variations in the simplified model of the coupled tube-monostable membrane system as a function of excitation amplitude. Due to the significant damping variability revealed by the identification results and the presence of an additional nonlinear damping term beyond the cubic stiffness term, an analytical study is conducted to assess the impact of nonlinear damping on the system dynamics.A numerical optimization approach is implemented to study and compare the damping effectiveness of bistable and monostable membranes. The optimization results are further validated by an in-depth numerical study of the coupled tube-membrane system dynamics for different linear stiffness values. Then, an analytical study of the coupled tube-bistable membrane system is presented, to explain the key findings of the optimization. To this end, a new calculation technique is introduced, which allows the development of analytical models describing the rich forced steady-state dynamics of our bistable system. This technique is based on a coordinate transformation that introduces a variable equilibrium position called the dynamic equilibrium position.This work is concluded with an experimental study dedicated to validate the main results of the optimization and to assess the variability of the dynamic equilibrium position. ; Le travail présenté dans ce mémoire de thèse concerne une solution d’absorbeur non ... |
نوع الوثيقة: | doctoral or postdoctoral thesis |
اللغة: | French |
Relation: | NNT: 2023ECDM0006 |
الاتاحة: | https://theses.hal.science/tel-04805769 https://theses.hal.science/tel-04805769v1/document https://theses.hal.science/tel-04805769v1/file/109019_BOUZID_2023_archivage-1.pdf |
Rights: | info:eu-repo/semantics/OpenAccess |
رقم الانضمام: | edsbas.8C0ED9A3 |
قاعدة البيانات: | BASE |
الوصف غير متاح. |