Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"Structural Acoustics"”.
-
Control of Sound Radiation From Structures with Periodic Smart Skins
… spectrum of the radiating surface. First, structural acoustics and periodic structure theories are reviewed in order to predict how bending waves propagate along a periodic beam and how this beam radiates sound. These theories are then extended to the case of multi-layered structures in …
-
Stability of fluid-loaded structures
… we adopt Crighton & Oswell’s (1991) structural acoustics approach and take a "wave scattering" --as opposed to a "modal superposition"-- view of the fluttering plate problem. First, we derive the energy balance relations for the extended plate (i.e., plate with two sided flow, spring …
-
Advanced Time Domain Sensing For Active Structural Acoustic Control
… of much research in the past decade. In Active Structural Acoustic Control (ASAC), the minimization of sound radiation is achieved by modifying the response of the structure through structural inputs rather than by exciting the acoustic medium (Active Noise Control, ANC). The ASAC technique …
-
Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach
Active structural acoustic control (ASAC) in conjunction with the adaptive feedforward control has been proved to be an efficient practical approach to reduce structure-borne sound. ASAC works on the principles of reducing the vibration amplitude of the structure (modal reduction), as well as …
-
Validation of a 3-D Virtual Acoustic Prototyping Method For Use In Structural Design
… a virtual acoustic prototyping method for use in structural design; this thesis illustrates the first attempt to apply the aforementioned methods to a structure that represents a typical building or automobile. The structure's acoustics were modeled using FEM, ESM, and HRTFs. A prototype of the …
-
Attenuation of Low Frequency Structurally Radiated Noise With an Array of Weak Radiating Cells
… radiating source. The control of low frequency structurally radiated noise is then achieved by covering the structure with an array of these weak radiating cells, i.e. surface treatment. Thus, the surface treatment essentially transforms the response of the structure to that of a distributed …
-
Structure-acoustic analysis; finite element modelling and reduction methods
This thesis investigates structure-acoustic systems by use of finite element analysis. The systems studied here are limited to those that consist of an enclosed acoustic fluid cavity, which is coupled to a flexible structure and/or a porous sound absorbing material domain. This type of analysis is …