scholarly journals Adaptive Analysis of Acoustic-Elastodynamic Interacting Models Considering Frequency Domain MFS-FEM Coupled Formulations

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
D. Soares ◽  
L. Godinho
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Frequency Domain ◽  
Iterative Algorithms ◽  
Fundamental Solutions ◽  
Frequency Domain Analysis ◽  
Method Of Fundamental Solutions ◽  
The Finite Element Method ◽  
Iterative Coupling ◽  
Adaptive Coupling

This work discusses adaptive iterative coupling strategies for the frequency domain analysis of interacting acoustic-elastodynamic models. The method of fundamental solutions (MFS) is used to analyze acoustic fluids, whereas the finite element method (FEM) is employed to discretize elastodynamic solids. Flexible and optimized iterative MFS-FEM coupling procedures are considered, allowing independent discretizations to be adopted for each subdomain. In this context, it is easy to implement adaptive refinements and enable enhanced analyses. Two adaptive coupling approaches are discussed, based on multiple and single iterative algorithms. Numerical results are presented to illustrate the performance of the proposed techniques.

Active Vibration Quenching Using Inverse Dynamics

1995 ◽  
Author(s):  
Thomas A. Trautt ◽  
Eduardo Bayo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Frequency Domain ◽  
Inverse Dynamics ◽  
Equations Of Motion ◽  
Input Function ◽  
Degree Of Freedom ◽  
The Finite Element Method ◽  
Simply Supported ◽  
Active Vibration

Abstract An inverse dynamics algorithm is derived for active vibration quenching of structures. The algorithm uses frequency domain technicques to compute an input function needed to produce a desired response at a particular degree of freedom. The desired response is a transition from the initial vibrating condition to a non-vibrating condition. The algorithm can also be used to modify the input function to correct for system disturbances while the input function is already being applied to the system. The algorithm is demostrated in a simulation of a simply supported beam controlled by a torque actuator at one end of the beam. The finite element method is used to discretize the equations of motion of the beam.

Prediction of Vibrations and Reradiated Noise Due to Railway Traffic: A Comprehensive Hybrid Model Based on a Finite Element Method and Method of Fundamental Solutions Approach

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Aires Colaço ◽  
Pedro Alves Costa ◽  
Paulo Amado-Mendes ◽  
Luís Godinho
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fundamental Solutions ◽  
Method Of Fundamental Solutions ◽  
Vibration Source ◽  
Perfectly Matched Layers ◽  
Structural Dynamic ◽  
Acoustic Environment ◽  
Railway Traffic ◽  
Element Method

The growing of railway infrastructures in urban environments demands accurate methods to predict and mitigate potential annoyance of the inhabitants of the surrounding buildings. The present paper aims to contribute to the goal by proposing a numerical model to predict vibrations and reradiated noise due to railway traffic. The model is based on a substructuring approach, where the whole propagation media are considered, from the vibration source (the vehicle–track interaction) to the receiver (the building and its interior acoustic environment). The system track–ground–building is simulated by a 2.5D finite element method–perfectly matched layers (FEM–PML) model, formulated in the frequency-wavenumber domain. The reradiated noise assessment is based on a 2.5D FEM–method of fundamental solutions (MFS) model, where the FEM is used to obtain the structural dynamic response. The structural displacements computed are used as the vibration input for the MFS model in order to assess the acoustic response inside the building's compartments. An application example is presented to assess vibrations and reradiated noise levels inside the building due to railway traffic. This is then followed by a discussion about the potential benefits of the introduction of floating-slab-track systems.

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