Relevant bibliographies by topics / Acoustic transfer function

Academic literature on the topic 'Acoustic transfer function'

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Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Acoustic transfer function"

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Ko, Hanseok. "CASA Based Approach to Estimate Acoustic Transfer Function Ratios." Journal Of The Acoustical Society Of Korea 33, no. 1 (2014): 54. http://dx.doi.org/10.7776/ask.2014.33.1.054.

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Mahroogi, Faisal O., S. Narayan, and Vipul Gupta. "Acoustic transfer function in gasoline engines." International Journal of Vehicle Noise and Vibration 14, no. 3 (2018): 270. http://dx.doi.org/10.1504/ijvnv.2018.097212.

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Narayan, S., Vipul Gupta, and Faisal O. Mahroogi. "Acoustic transfer function in gasoline engines." International Journal of Vehicle Noise and Vibration 14, no. 3 (2018): 270. http://dx.doi.org/10.1504/ijvnv.2018.10018293.

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Zhang, Jie, Richard Heusdens, and Richard Christian Hendriks. "Relative Acoustic Transfer Function Estimation in Wireless Acoustic Sensor Networks." IEEE/ACM Transactions on Audio, Speech, and Language Processing 27, no. 10 (October 2019): 1507–19. http://dx.doi.org/10.1109/taslp.2019.2923542.

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Fokin, Vladimir N., Margarita S. Fokina, James M. Sabatier, and Wheeler B. Howard. "Geoacoustic inversion via acoustic‐seismic transfer function." Journal of the Acoustical Society of America 114, no. 4 (October 2003): 2457. http://dx.doi.org/10.1121/1.4779613.

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Hamaguchi, Takashi, Tosiaki Miyati, Naoki Ohno, Masaya Hirano, Norio Hayashi, Toshifumi Gabata, Osamu Matsui, et al. "Acoustic Noise Transfer Function in Clinical MRI." Academic Radiology 18, no. 1 (January 2011): 101–6. http://dx.doi.org/10.1016/j.acra.2010.09.009.

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Funck, B., and A. Mitzkus. "Acoustic transfer function of the clamp-on flowmeter." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 43, no. 4 (July 1996): 569–75. http://dx.doi.org/10.1109/58.503717.

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Gu, Chen, Ulrich Mok, Youssef M. Marzouk, Germán A. Prieto, Farrokh Sheibani, J. Brian Evans, and Bradford H. Hager. "Bayesian waveform-based calibration of high-pressure acoustic emission systems with ball drop measurements." Geophysical Journal International 221, no. 1 (December 18, 2019): 20–36. http://dx.doi.org/10.1093/gji/ggz568.

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SUMMARY Acoustic emission (AE) is a widely used technology to study source mechanisms and material properties during high-pressure rock failure experiments. It is important to understand the physical quantities that acoustic emission sensors measure, as well as the response of these sensors as a function of frequency. This study calibrates the newly built AE system in the MIT Rock Physics Laboratory using a ball-bouncing system. Full waveforms of multibounce events due to ball drops are used to infer the transfer function of lead zirconate titanate (PZT) sensors in high pressure environments. Uncertainty in the sensor transfer functions is quantified using a waveform-based Bayesian approach. The quantification of in situ sensor transfer functions makes it possible to apply full waveform analysis for acoustic emissions at high pressures.
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Makarov, I. S. "A fast transfer function algorithm for nonuniform acoustic tubes." Acoustical Physics 57, no. 5 (September 2011): 709–21. http://dx.doi.org/10.1134/s1063771011040154.

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Gunda, Rajendra, and Sandeep Vijayakar. "Computing Radiated Sound Power using Quadratic Power Transfer Vector (QPTV)." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4257–67. http://dx.doi.org/10.3397/in-2021-2643.

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Pressure Acoustic Transfer Functions or Vectors (PATVs) relate the surface velocity of a structure to the sound pressure level at a field point in the surrounding fluid. These functions depend only on the structure geometry, properties of the fluid medium (sound speed and characteristic density), the excitation frequency and the location of the field point, but are independent of the surface velocity values themselves. Once the pressure acoustic transfer function is computed between a structure and a specified field point, we can compute pressure at this point for any boundary velocity distribution by simply multiplying the forcing function (surface velocity) with the acoustic transfer function. These PATVs are usually computed by application of the Reciprocity Principle, and their computation is well understood. In this work, we present a novel way to compute the Velocity Acoustic Transfer Vector (VATV) which is a relation between the surface velocity of the structure and fluid particle velocity at a field point. To our knowledge, the computation of the VATV is completely new and has not been published in earlier works. By combining the PATVs and VATVs at a number of field points surrounding the structure, we obtain the Quadratic Power Transfer Vector (QPTV) that allows us to compute the sound power radiated by a structure for ANY surface velocity distribution. This allows rapid computation of the sound power for an arbitrary surface velocity distributions and is useful in designing quiet structures by minimizing the sound power radiated.
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Dissertations / Theses on the topic "Acoustic transfer function"

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Kim, Young Seon. "Transfer function of the embryonic avian middle ear /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3074415.

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Elwali, Wael. "Vehicle Vibro-Acoustic Response Computation and Control." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382373197.

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Bellows, Benjamin Davis. "Characterization of nonlinear heat release-acoustic interactions in gas turbine combustors." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-03262006-205604/.

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Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2006.
Dr. Jeffrey Cohen, Committee Member ; Dr. Jerry Seitzman, Committee Member ; Dr. Jeff Jagoda, Committee Member ; Dr. Ben Zinn, Committee Member ; Dr. Tim Lieuwen, Committee Chair.
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Betlehem, Terence, and terenceb@rsise anu edu au. "Acoustic Signal Processing Algorithms for Reverberant Environments." The Australian National University. Research School of Information Sciences and Engineering, 2005. http://thesis.anu.edu.au./public/adt-ANU20051129.121453.

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This thesis investigates the design and the analysis of acoustic signal processing algorithms in reverberant rooms. Reverberation poses a major challenge to acoustic signal processing problems. It degrades speech intelligibility and causes many acoustic algorithms that process sound to perform poorly. Current solutions to the reverberation problem frequently only work in lightly reverberant environments. There is need to improve the reverberant performance of acoustic algorithms.¶ The approach of this thesis is to explore how the intrinsic properties of reverberation can be exploited to improve acoustic signal processing algorithms. A general approach to soundfield modelling using statistical room acoustics is applied to analyze the reverberant performance of several acoustic algorithms. A model of the underlying structure of reverberation is incorporated to create a new method of soundfield reproduction.¶ Several outcomes resulting from this approach are: (i) a study of how more sound capture with directional microphones and beamformers can improve the robustness of acoustic equalization, (ii) an assessment of the extent to which source tracking can improve accuracy of source localization, (iii) a new method of soundfield reproduction for reverberant rooms, based upon a parametrization of the acoustic transfer function and (iv) a study of beamforming to directional sources, specifically exploiting the directionality of human speech.¶ The approach to soundfield modelling has permitted a study of algorithm performance on important parameters of the room acoustics and the algorithm design. The performance of acoustic equalization and source tracking have been found to depend not only on the levels of reverberation but also on the correlation of pressure between points in reverberant soundfields. This correlation can be increased by sound capture with directional capture devices. Work on soundfield reproduction has shown that, though reverberation significantly degrades the performance of conventional techniques, by accounting for the reverberation it is possible to design reproduction methods that function well in reverberant environments.
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Black, Paul Randall. "Acoustic Transfer Functions Derived from Finite Element Modeling for Thermoacoustic Stability Predictions of Gas Turbine Engines." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33978.

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Acoustic Transfer Functions Derived from Finite Element Modeling for Thermoacoustic Stability Predictions of Gas Turbine Engines

Design and prediction of thermoacoustic instabilities is a major challenge in aerospace propulsion and the operation of power generating gas turbine engines. This is a complex problem in which multiple physical systems couple together. Traditionally, thermoacoustic models can be reduced to dominant physics which depend only on flame dynamics and acoustics. This is the general approach adopted in this research. The primary objective of this thesis is to describe how to obtain acoustic transfer functions using finite element modeling. These acoustic transfer functions can be coupled with flame transfer functions and other dynamics to predict the thermoacoustic stability of gas turbine engines. Results of this research effort can go beyond the prediction of instability and potentially can be used as a tool in the design stage. Consequently, through the use of these modeling tools, better gas turbine engine designs can be developed, enabling expanded operating conditions and efficiencies.

This thesis presents the finite element (FE) methodology used to develop the acoustic transfer functions of the Combustion System Dynamics Laboratory (CSDL) gaseous combustor to support modeling and prediction of thermoacoustic instabilities. In this research, several different areas of the acoustic modeling were addressed to develop a representative acoustics model of the hot CSDL gaseous combustor. The first area was the development and validation of the cold acoustic finite element model. A large part of this development entailed finding simple but accurate means for representing complex geometries and boundary conditions. The cold-acoustic model of the laboratory combustor was refined and validated with the experimental data taken on the combustion rig.

The second stage of the research involved incorporating the flame into the FE model and has been referred to in this thesis as hot-acoustic modeling. The hot-acoustic model also required the investigation and characterization of the flame as an acoustic source. The detailed mathematical development for the full reacting acoustic wave equation was investigated and simplified sufficiently to identify the appropriate source term for the flame. It was determined that the flame could be represented in the finite element formulation as a volumetric acceleration, provided that the flame region is small compared to acoustic wavelengths. For premixed gas turbine combustor flames, this approximation of a small flame region is generally a reasonable assumption.

Both the high temperature effects and the flame as an acoustic source were implemented to obtain a final hot-acoustic FE model. This model was compared to experimental data where the heat release of the flame was measured along with the acoustic quantities of pressure and velocity. Using these measurements, the hot-acoustic FE model was validated and found to correlate with the experimental data very well.

The thesis concludes with a discussion of how these techniques can be utilized in large industrial-size combustors. Insights into stability are also discussed. A conclusion is then presented with the key results from this research and some suggestions for future work.
Master of Science

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Febrer, Alles Gemma. "A hybrid approach for inclusion of acoustic wave effects in incompressible LES of reacting flows." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/11979.

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LLean premixed combustion systems, attractive for low NOx performance, are inherently susceptible to thermo-acoustic instabilities - the interaction between unsteady heat release and excited acoustic wave effects. In the present work, a hybrid, coupled Large Eddy Simulation (LES) CFD approach is described, combining the computational efficiency of incompressible reacting LES with acoustic wave effects captured via an acoustic network model. A flamelet approach with an algebraic Flame Surface Density (FSD) combustion model was used. The ORACLES experiments - a perfectly premixed flame stabilised in a 3D sudden expansion - are used for validation. Simulations of the inert flow agree very well with experimental data, reproducing the measured amplitude and distribution of turbulent fluctuations as well as capturing the asymmetric mean flow. With reaction the measured data exhibit a plane wave acoustic mode at 50Hz. The influence of this plane wave must be incorporated into the LES calculation. Thus, a new approach to sensitise the incompressible LES CFD to acoustic waves is adopted. First an acoustic network model of the experimental geometry is analysed to predict the amplitude of the 50Hz mode just before the flame zone. This is then used to introduce a coherent plane wave at the LES inlet plane at the appropriate amplitude, unlike previous LES studies, which have adopted a "guess and adjust" approach. Incompressible LES predictions of this forced flow then show good agreement with measurements of mean and turbulent velocity, as well as for flame shape, with a considerable improvement relative to unforced simulations. To capitalise on the unsteady flame dynamics provided by LES, simulations with varying forcing amplitude were conducted and analysed. Amplitude dependent Flame Transfer Functions (FTFs) were extracted and fed into an acoustic network model. This allowed prediction of the stable/unstable nature of the flame at each forcing amplitude. An amplitude at which the flame changed from unstable to stable would be an indication that this coupled approach was capable of predicting a limit cycle behaviour. With the current simple FSD combustion model almost all cases studied showed a stable flame. Predictions showed considerable sensitivity to the value chosen for the combustion model parameter but specially to the acoustic geometric configuration and boundary conditions assumed showing evidence of limit cycle behaviour for some combinations. Nevertheless, further work is required to improve both combustion model and the accuracy of acoustic configuration and boundary condition specification.
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Zhang, Nan. "SCALE MODELS OF ACOUSTIC SCATTERING PROBLEMS INCLUDING BARRIERS AND SOUND ABSORPTION." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/119.

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Scale modeling has been commonly used for architectural acoustics but use in other noise control areas is nominal. Acoustic scale modeling theory is first reviewed and then feasibility for small-scale applications, such as is common in the electronics industry, is investigated. Three application cases are used to examine the viability. In the first example, a scale model is used to determine the insertion loss of a rectangular barrier. In the second example, the transmission loss through parallel tubes drilled through a cylinder is measured and results are compared to a 2.85 times scale model with good agreement. The third example is a rectangular cuboid with a smaller cylindrical well bored into it. A point source is placed above the cuboid. The transfer function was measured between positions on the top of the cylinder and inside of the cylindrical well. Treatments were then applied sequentially including a cylindrical barrier around the well, a membrane cover over the opening, and a layer of sound absorption over the well. Results are compared between the full scale and a 5.7 times scale model and correlation between the two is satisfactory.
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Hemchandra, Santosh. "Dynamics of turbulent premixed flames in acoustic fields." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29615.

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Thesis (Ph.D)--Aerospace Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Lieuwen, Tim; Committee Member: Menon, Suresh; Committee Member: Peters, Norbert; Committee Member: Yang, Vigor; Committee Member: Zinn, Benjamin. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Khanna, Vivek K. "A Study of the Dynamics of Laminar and Turbulent Fully and Partially Premixed Flames." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28527.

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This present research effort was directed towards developing reduced order models for the dynamics of laminar flat flames, swirl stabilized turbulent flames, and in evaluating the effects of the variation in fuel composition on flame dynamics. The laminar flat flame study was conducted on instrument grade methane, propane, and ethane flames for four total flow rates from 145 cc/sec to 200 cc/sec, and five equivalence ratios from 0.5 to 0.75. The analysis was done by measuring the frequency resolved velocity perturbations, u', and the OH* chemiluminescence, as a measure of unsteady heat release rate, q'. The experimental data showed the corresponding flame dynamics to be fourth order in nature with a pure time delay. One of the resonance was shown to represent the pulsation of the flame location caused by fluctuation in the flame speed and fluctuating heat losses to the flame stabilizer. The other resonance was correlated to the dynamics of the chemical kinetics involved in the combustion process. The time delay was correlated to the chemical time delay. Upon comparing the results of the experiments with the three fuels, it was concluded that for all equivalence ratios studied, propane flame had a higher dynamic gain than methane flames. Ethane flames exhibited a higher dynamic gain than methane flame in the frequency range of 20-100 Hz. Thus, burning of propane instead of methane increased the likelihood of the occurrence of thermo-acoustic instabilities. The experimental techniques developed during the dynamic studies conducted on laminar flat flames were applied to swirl stabilized turbulent flames. Experiments were performed for QAir = 15 scfm and 20 scfm, F = 0.55, 0.6, 0.65, and S = 0.79 and 1.19. The results of fully premixed experiments showed that the flame behaved as a 8th order low pass filter. The results of the partially premixed experiment exhibited a rich spectra, which maintained its bandwidth over the entire range of frequency studied. Comparison of fully and partially premixed flames in the frequency range of 200-400 Hz, indicated that at overall lean conditions the dynamic gain of the totally premixed flames was almost an order of magnitude lower than that of the partially premixed conditions. Thus, it was concluded that combustors with fully premixed flames have a higher probability of being thermo-acoustically stable than those with partially premixed flames.
Ph. D.
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Webber, Michael L. "Phase Shift Control: Application and Performance Limitations With Respect to Thermoacoustic Instabilities." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/36418.

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Lean premixed fuel-air conditions in large gas turbines are used to improve efficiency and reduce emissions. These conditions give rise to large undamped pressure oscillations at the combustor's natural frequencies which reduce the turbine's longevity and reliability. Active control of the pressure oscillations, called thermoacoustic instabilities, has been sought as passive abatement of these instabilities does not provide adequate damping and is often impractical on a large scale. Phase shift control of the instabilities is perhaps the simplest and most popular technique employed but often does not provide good performance in that controller induced secondary instabilities are generated with increasing loop gain.

This thesis investigates the general underlying cause of the secondary instabilities and shows that high average group delay through the frequency region of the instability is the root of the problem. This average group delay is then shown to be due not only the controller itself but can also be associated with other components and inherent characteristics of the control loop such as actuators and time delay, respectively. An "optimum" phase shift controller, consisting of an appropriate shift in phase and a low order, wide bandwidth bandpass filter, is developed for a Rijke tube combustor and shown to closely match the response of an LQG controller designed only for system stabilization. Both the optimal phase shifter and the LQG controller are developed based on a modified model of the thermoacoustic loop which takes into account the change in density of the combustion reactants at the flame location. Additionally, the system model is coupled with a model of the control loop and then validated by comparison of simulated results to experimental results using nearly identical controllers.


Master of Science
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Books on the topic "Acoustic transfer function"

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Iida, Kazuhiro. Head-Related Transfer Function and Acoustic Virtual Reality. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5.

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Meyer, Robert H. Experimental determination of transfer functions for a coated, ring stiffened cylinder as a function of hydrostatic pressure. Springfield, Va: Available from National Technical Information Service, 1997.

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Waddington, David Charles. Acoustical impedance measurement using a two-microphone transfer function technique. Salford: University of Salford, 1990.

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Iida, Kazuhiro. Head-Related Transfer Function and Acoustic Virtual Reality. Springer, 2019.

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Lockheed Martin Engineering and Sciences (Firm) and Langley Research Center, eds. Binaural simulation experiments in the NASA Langley Structural Acoustics Loads and Transmission Facility. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 2001.

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Steward, David R. Analytic Element Method. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198856788.001.0001.

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The Analytic Element Method provides a foundation to solve boundary value problems commonly encountered in engineering and science. The goals are: to introduce readers to the basic principles of the AEM, to provide a template for those interested in pursuing these methods, and to empower readers to extend the AEM paradigm to an even broader range of problems. A comprehensive paradigm: place an element within its landscape, formulate its interactions with other elements using linear series of influence functions, and then solve for its coefficients to match its boundary and interface conditions with nearly exact precision. Collectively, sets of elements interact to transform their environment, and these synergistic interactions are expanded upon for three common types of problems. The first problem studies a vector field that is directed from high to low values of a function, and applications include: groundwater flow, vadose zone seepage, incompressible fluid flow, thermal conduction and electrostatics. A second type of problem studies the interactions of elements with waves, with applications including water waves and acoustics. A third type of problem studies the interactions of elements with stresses and displacements, with applications in elasticity for structures and geomechanics. The Analytic Element Method paradigm comprehensively employs a background of existing methodology using complex functions, separation of variables and singular integral equations. This text puts forth new methods to solving important problems across engineering and science, and has a tremendous potential to broaden perspective and change the way problems are formulated.
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Book chapters on the topic "Acoustic transfer function"

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Iida, Kazuhiro. "Acoustic VR System." In Head-Related Transfer Function and Acoustic Virtual Reality, 195–205. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_13.

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Iida, Kazuhiro. "Measurement Method for HRTF." In Head-Related Transfer Function and Acoustic Virtual Reality, 149–56. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_9.

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Iida, Kazuhiro. "Introduction." In Head-Related Transfer Function and Acoustic Virtual Reality, 1–14. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_1.

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Iida, Kazuhiro. "Signal Processing of HRTF." In Head-Related Transfer Function and Acoustic Virtual Reality, 157–70. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_10.

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Iida, Kazuhiro. "Comparison of HRTF Databases." In Head-Related Transfer Function and Acoustic Virtual Reality, 171–77. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_11.

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Iida, Kazuhiro. "Principle of Three-Dimensional Sound Reproduction." In Head-Related Transfer Function and Acoustic Virtual Reality, 179–94. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_12.

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Iida, Kazuhiro. "HRTF and Sound Localization in the Horizontal Plane." In Head-Related Transfer Function and Acoustic Virtual Reality, 15–24. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_2.

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Iida, Kazuhiro. "HRTF and Sound Localization in the Median Plane." In Head-Related Transfer Function and Acoustic Virtual Reality, 25–57. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_3.

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Iida, Kazuhiro. "Individuality of HRTF." In Head-Related Transfer Function and Acoustic Virtual Reality, 59–105. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_4.

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Iida, Kazuhiro. "HRTF and Sound Image Control for an Arbitrary Three-Dimensional Direction." In Head-Related Transfer Function and Acoustic Virtual Reality, 107–21. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9745-5_5.

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Conference papers on the topic "Acoustic transfer function"

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De Souza Faria, Gerson, and Hae Yong Kim. "Identification of Pressed Keys by Acoustic Transfer Function." In 2015 IEEE International Conference on Systems, Man and Cybernetics (SMC). IEEE, 2015. http://dx.doi.org/10.1109/smc.2015.54.

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Takiguchi, Tetsuya, Yuji Sumida, and Yasuo Ariki. "Estimation of Room Acoustic Transfer Function using Speech Model." In 2007 IEEE/SP 14th Workshop on Statistical Signal Processing. IEEE, 2007. http://dx.doi.org/10.1109/ssp.2007.4301275.

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Samarasinghe, Prasanga N., and Thushara D. Abhayapala. "Room transfer function measurement from a directional loudspeaker." In 2016 IEEE International Workshop on Acoustic Signal Enhancement (IWAENC). IEEE, 2016. http://dx.doi.org/10.1109/iwaenc.2016.7602969.

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Pan, Jian-Hong, Chang-Chun Bao, Bing Bu, and Mao-shen Jia. "Measurement of the acoustic transfer function using compressed sensing techniques." In 2016 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA). IEEE, 2016. http://dx.doi.org/10.1109/apsipa.2016.7820907.

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Jinsoo Jeong and Kee Chien Wong. "Identification of acoustic path transfer function component in beamforming structure." In 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA 2013). IEEE, 2013. http://dx.doi.org/10.1109/iciea.2013.6566575.

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Ribeiro, Juliano G. C., Natsuki Ueno, Shoichi Koyama, and Hiroshi Saruwatari. "Kernel interpolation of acoustic transfer function between regions considering reciprocity." In 2020 IEEE 11th Sensor Array and Multichannel Signal Processing Workshop (SAM). IEEE, 2020. http://dx.doi.org/10.1109/sam48682.2020.9104256.

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Fokin, Vladimir N., Margarita S. Fokina, James M. Sabatier, and Wheeler B. Howard. "Determination of soil background parameters via acoustic-seismic transfer function." In Defense and Security, edited by Russell S. Harmon, J. Thomas Broach, and John H. Holloway, Jr. SPIE, 2004. http://dx.doi.org/10.1117/12.542740.

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Lei, Wang, and Zeng Xiangyang. "New method for synthesizing personalized head-related transfer function." In 2016 IEEE International Workshop on Acoustic Signal Enhancement (IWAENC). IEEE, 2016. http://dx.doi.org/10.1109/iwaenc.2016.7602913.

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Schuermans, Bruno, Felix Guethe, and Wolfgang Mohr. "Optical Transfer Function Measurements for Technically Premixed Flames." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51500.

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This paper deals with a novel approach for measuring thermo-acoustic transfer functions. These transfer functions are essential to predict the acoustic behavior of gas turbine combustion systems. Thermoacoustic prediction has become an essential step in the development process of low-NOx combustion systems. The proposed method is particularly useful in harsh environments. It makes use of simultaneous measurement of the chemiluminescence of different species in order to obtain the heat release fluctuations via an inverse method. Generally, the heat release fluctuation has two contributions: one due to equivalence ratio fluctuations, the other due to modulations of mass flow of mixture entering the reaction zone. Because the chemiluminescence of one single species depends differently on the two contributions, it is not possible to quantitatively estimate the heat based on this information. Measurement of the transfer matrix based on a purely acoustic method provides quantitative results, independent of the nature of the interaction mechanism. However, this method is difficult to apply in industrial full-scale experiments. The method developed in this work uses the chemiluminescence time traces of several species. After calibration, an over-determined inverse method is used to calculate the two heat release contributions from the time traces. The optical method proposed here has the advantage that it does not only provide quantitative heat release fluctuations, but it also quantifies the underlying physical mechanisms that cause the heat release fluctuations: it shows what part of the heat release is caused by equivalence ratio fluctuations and what part by flame front dynamics. The method has been tested on a full scale, swirl stabilized gas turbine burner. Comparison with a purely acoustic method validated the concept.
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Klein, Sikke A., and Jim B. W. Kok. "Acoustic Instabilities in Syngas Fired Combustion Chambers." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-355.

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Abstract:
Gas turbines fired on syngas may show thermo-acoustic combustion instabilities. The theory on these instabilities is well developed. From this theory it can be shown that the acoustic system of a combustion installation can be described as a control loop with a set of transfer functions. The transfer function of the flame plays a decisive role in the occurrence of combustion instabilities. It is however very difficult to predict this flame transfer function analytically. In this paper a numerical method will be presented to calculate the flame transfer function from time-dependent combustion calculations. Also an experimental method will be discussed to determine this flame transfer function. Experiments have been performed in a 25 kW atmospheric test rig. Also calculations have been done for this situation. The agreement between the measurements and CFD calculations is good, especially for the phase at higher frequencies. This opens the way to apply CFD-modeling for acoustics in a real gas turbine situation.
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