Mazzeo, Giulia (2021) Design of a structural device for vibroacoustic measurements in a wind tunnel. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Resource language: English
Title: Design of a structural device for vibroacoustic measurements in a wind tunnel
Creators:
CreatorsEmail
Mazzeo, Giuliagiul.mazzeo@gmail.com
Date: 20 September 2021
Number of Pages: 197
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Chimica, dei Materiali e della Produzione Industrialea
Dottorato: Ingegneria dei materiali e delle strutture
Ciclo di dottorato: 34
Coordinatore del Corso di dottorato:
nomeemail
Grassi, Michelemichele.grassi@unina.it
Tutor:
nomeemail
Ichchou, MohamedUNSPECIFIED
Bareille, OlivierUNSPECIFIED
De Rosa, SergioUNSPECIFIED
Franco, FrancescoUNSPECIFIED
Petrone, GiuseppeUNSPECIFIED
Date: 20 September 2021
Number of Pages: 197
Keywords: Wind tunnel, vibroacoustics, Statistical Energy Analysis, Turbulent Boundary Layer
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/04 - Costruzioni e strutture aerospaziali
Date Deposited: 17 Dec 2021 12:47
Last Modified: 28 Feb 2024 11:32
URI: http://www.fedoa.unina.it/id/eprint/14347

Collection description

In the industrial field of transportation, which includes aeronautics, automotive, railways an naval, the vibrational response of a structure to a pressure fluctuation due to a turbulent flow is the main subject of research. The reason lays on the consequences that the turbulent flow-induced vibrations can cause, such as fatigue problems and structural damage. Test panels are often analysed in wind tunnels in order to obtain the vibroacoustic characteristics, hence it is necessary to ensure the purity of the measurements performed in the facilities. With the present work, it is wanted to develop a structural design for a device which would play as support for flat panels inside a large-scale wind tunnel. The design based on material and geometry choice has been performed through a system of design guidelines developed with Statistical Energy Analysis which would ensure an energy transmission decoupling between the support and the test model. The designed device is then analysed in the high and low frequency domains, in order to evaluate the performances of the structure. Together with the design guidelines, an "off-line" validation method is proposed in order to test the structure even before its allocation in a wind tunnel. The proposed method is an experimental adaptation of the Pseudo-Equivalent Deterministic Excitation method (PEDEm) which is based on the approximation of a Turbulent Boundary Layer (TBL) excitation in two different asymptotic behaviours: at low frequencies (LF) as an Incident Diffuse Field, and at high frequencies (HF) as a totally-uncorrelated pressure field as a Rain-On-the-Roof excitation. Both the design guidelines and the "off-line" validation method are meant to be the tools for for a fast but efficient structural design process and for the verification of the model.

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