Dissertation/ Thesis
Extension of the SmEdA method by taking into account dissipative materials at medium frequencies ; Extension de la méthode SmEdA par la prise en compte des matériaux dissipatifs en moyennes fréquences
| العنوان: | Extension of the SmEdA method by taking into account dissipative materials at medium frequencies ; Extension de la méthode SmEdA par la prise en compte des matériaux dissipatifs en moyennes fréquences |
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| المؤلفون: | Hwang, Hadong |
| المساهمون: | Laboratoire Vibrations Acoustique (LVA), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), INSA de Lyon, Kerem Ege, Jean-Louis Guyader |
| المصدر: | https://theses.hal.science/tel-01368562 ; Acoustics [physics.class-ph]. INSA de Lyon, 2015. English. ⟨NNT : 2015ISAL0048⟩. |
| بيانات النشر: | CCSD |
| سنة النشر: | 2015 |
| المجموعة: | Université de Lyon: HAL |
| مصطلحات موضوعية: | Acoustic, Vibroacoustic, Vibroacoustic behavior, SmEdA, SEA method, Frequency average, Structure-Fluid system, Experimental validation, Power injected, Vibration Damping, Acoustique appliquée, Vibro-Acoustique, Vibro-Acoustique de moyenne fréquence, Sea, Méthode des éléments finis, Moyenne fréquence, Couplage fluide-Structure, Validation expérimentale, Puissance injectée, Amortissement des vibrations, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] |
| الوصف: | The project CLIC (City Lightweight Innovative Cab) aims to develop a lighter-weighted truck that maintains NVH performances of the initial design. This PhD research is then to establish a vibroacoustic prediction model of a complex structure-bounded fluid system (cabin structure coupled to cabin space) including dissipative treatments (damping or absorbing materials) for the mid-frequency domain. Since most commonly used element based and statistical methods are not suitable for this frequency domain, a proper prediction tool, which should be flexible in modeling capabilities and feasible in computational cost, must be implemented. The SmEdA (Statistical modal Energy distribution Analysis) method is considered in this thesis to comply with these requirements. The main objective of this research is to extend this method for taking account of the damping effect induced by dissipative materials. Development and validation of the methodology are carried out. 1. Dissipative materials are represented by simplified equivalent models: (1) the equivalent single layer model for describing the plate covered with a viscoelastic layer and (2) the equivalent fluid model for describing a porous material into the cavity. 2. Each subsystem including the equivalent models of the dissipative materials is modeled with FEM(Finite Element Model). The FE matrices including the energy dissipation are then computed. The MSE (Modal Strain Energy) and MSKE (Modal Strain Kinetic Energy) methods are used to estimate the modal damping loss factor of each subsystem mode. 3. The SmEdA calculation is performed on a whole system considering the modal damping loss factors estimated in the second step for each subsystem. The power is injected into the plate at a localized point by the stationary white noise force and subsequently, the SmEdA parameters are computed. To validate the proposed methodology, laboratory test cases of the structure-fluid problem composed of a rectangular plate coupled to a parallelepipedic cavity are considered. Such ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| Relation: | NNT: 2015ISAL0048 |
| الاتاحة: | https://theses.hal.science/tel-01368562 https://theses.hal.science/tel-01368562v1/document https://theses.hal.science/tel-01368562v1/file/these.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.54B2A746 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |