Experimental and computational models for simulating sound propagation and acoustic source localization within the lungs

Date

2006-11-10

Author

Serhan, Açıkgöz
Özer, Mehmet Bülent
Thomas J, Royston
Hanson A, Mansy
Sandler, Rıchard H

Metadata

Show full item record

Item Usage Stats

110
views

0
downloads

An acoustic boundary element (BE) model for porous compliant material like the lung parenchyma is developed and validated theoretically and experimentally. This BE model is coupled with a source localization algorithm to predict the position of an acoustic source within a lung phantom. The BE model is also coupled with a finite element (FE) model to simulate the surrounding shell-like chest wall. Experimental studies validate the BE-based source localization algorithm and show that the same algorithm fails if the BE simulation is replaced with a free field assumption that neglects reflections and standing wave patterns created within the finite-size lung phantom. This research is relevant to the development of advanced auscultatory techniques for lung, vascular and cardiac sounds within the torso that utilize multiple noninvasive sensors to create acoustic images of the sound generation and transmission to identify certain pathologies.

Subject Keywords

Acoustics, Lung, Algorithms, Phantoms, Boundary element methods, Finite element analysis, Reflection, Sensors, Shells, Simulation, Standing waves

URI

https://hdl.handle.net/11511/73646
https://asmedigitalcollection.asme.org/IMECE/proceedings-abstract/IMECE2006/47721/55/320684

DOI

https://doi.org/doi.org/10.1115/IMECE2006-16297

Conference Name

ASME 2006 International Mechanical Engineering Congress and Exposition

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

External Search Coil as a Means of Measuring Rotor Speed of an Induction Motor Özlü Ertan, Hatice Gülçin; Keysan, Ozan (2009-07-03) The study in this paper investigates whether the air gap harmonics can be identified by using an external search coil placed on the frame of an induction motor. For this purpose the study focuses on the prediction of rotor speed of an induction motor from external search coil emf, using spectral analysis techniques. In the first stage of the study the type of search coil which maximizes the induced emf is sought, also the position of the coil on the induced emf is investigated. Several motors are tested wit...
Dynamic analysis of beams with breathing crack using finite element method Özkan, Berkay; Kadıoğlu, Fevzi Suat; Department of Mechanical Engineering (2017) Non-linear dynamic characteristics of a beam with a breathing crack are investigated using finite element method. This thesis has two main objectives: (1) to obtain a foresight for the vibration based crack detection by using finite element method (2) to investigate the effects of crack location, crack depth, excitation frequency, excitation amplitude and boundary conditions on the indications of crack presence. Two dimensional finite element approach is used to model a square cross sectional beam subjected...
Acoustic radiation from a fluid-filled, subsurface vascular tube with internal turbulent flow due to a constriction Yazıcıoğlu, Yiğit; Spohnholtz, Todd; Martin, Bryn; Loth, Francis; Bassiouny, Hisham S. (Acoustical Society of America (ASA), 2005-08-01) The vibration of a thin-walled cylindrical, compliant viscoelastic tube with internal turbulent flow due to an axisymmetric constriction is studied theoretically and experimentally. Vibration of the tube is considered with internal fluid coupling only, and with coupling to internal-flowing fluid and external stagnant fluid or external tissue-like viscoelastic material. The theoretical analysis includes the adaptation of a model for turbulence in the internal fluid and its vibratory excitation of and interac...
Numerical analysis of thermo-mechanical behavior in flow forming Günay, Enes; Fenercioglu, Tevfik Ozan; Yalçınkaya, Tuncay (2021-01-01) Flow forming is a metal forming process for cylindrical workpieces where high velocity deformation leads to radial thinning and axial extension. In the current study, a thermomechanical, dynamic and explicit finite element model of a flow forming process is developed on ABAQUS software. The model is validated through the comparison of reaction forces and geometry obtained from the experiments. Coolant convection effect is analyzed in conjunction with roller and mandrel conduction cooling to study the therma...
Ultra-fast charge exchange spectroscopy for turbulent ion temperature fluctuation measurements on the DIII-D tokamak (invited) Uzun Kaymak, İlker Ümit; McKee, G. R. (2012-10-01) A novel two-channel, high throughput, high efficiency spectrometer system has been developed to measure impurity ion temperature and toroidal velocity fluctuations associated with long-wavelength turbulence and other plasma instabilities. The spectrometer observes the emission of the n = 8-7 hydrogenic transition of C+5 ions (lambda(air) = 529.06 nm) resulting from charge exchange reactions between deuterium heating beams and intrinsic carbon. Novel features include a large, prism-coupled high-dispersion, v...

Citation Formats

A. Serhan, M. B. Özer, R. Thomas J, M. Hanson A, and R. H. Sandler, “Experimental and computational models for simulating sound propagation and acoustic source localization within the lungs,” 2006, p. 55, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/73646.