Relevant bibliographies by topics / Acoustics, Dynamics, and Controls

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Acoustics, Dynamics, and Controls'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Acoustics, Dynamics, and Controls"

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Tucker, Albert J. "Active control: New paradigms for structural acoustics and dynamics." Journal of the Acoustical Society of America 97, no. 5 (May 1995): 3266. http://dx.doi.org/10.1121/1.411652.

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Maeda, Kazuki, and Tim Colonius. "Bubble cloud dynamics in an ultrasound field." Journal of Fluid Mechanics 862 (January 16, 2019): 1105–34. http://dx.doi.org/10.1017/jfm.2018.968.

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The dynamics of bubble clouds induced by high-intensity focused ultrasound is investigated in a regime where the cloud size is similar to the ultrasound wavelength. High-speed images show that the cloud is asymmetric; the bubbles nearest the source grow to a larger radius than the distal ones. Similar structures of bubble clouds are observed in numerical simulations that mimic the laboratory experiment. To elucidate the structure, a parametric study is conducted for plane ultrasound waves with various amplitudes and diffuse clouds with different initial void fractions. Based on an analysis of the kinetic energy of liquid induced by bubble oscillations, a new scaling parameter is introduced to characterize the dynamics. The new parameter generalizes the cloud interaction parameter originally introduced by d’Agostino & Brennen (J. Fluid Mech., vol. 199, 1989, pp. 155–176). The dynamic interaction parameter controls the energy localization and consequent anisotropy of the cloud. Moreover, the amplitude of the far-field, bubble-scattered acoustics is likewise correlated with the proposed parameter. Findings of the present study not only shed light on the physics of cloud cavitation, but may also be of use for the quantification of the effects of cavitation on outcomes of ultrasound therapies including high-intensity focused ultrasound-based lithotripsy.
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Gabbert, Ulrich, Fabian Duvigneau, and Stefan Ringwelski. "NOISE CONTROL OF VEHICLE DRIVE SYSTEMS." Facta Universitatis, Series: Mechanical Engineering 15, no. 2 (August 2, 2017): 183. http://dx.doi.org/10.22190/fume170615009g.

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The paper presents an overall simulation approach to control the noise emission of car engines at a very early stage of the design process where no real prototypes are available. The suggested approach combines different physical models and couples different software tools such as multi-body analysis, fluid dynamics, structural mechanics, magneto-electrodynamics, thermodynamics, acoustics and control as well. The general overall simulation methodology is presented first. Then, this methodology is applied to a combustion engine in order to improve its acoustical behavior by passive means, such as changing the stiffness and the use of damping materials to build acoustic and thermal encapsulations. The active control by applying piezoelectric patch actuators at the oil sump as the noisiest part of the engine is discussed as well. The sound emission is evaluated by hearing tests and a mathematical prediction model of the human perception. Finally, it is shown that the presented approach can be extended to electric engines, which is demonstrated at a newly developed electric wheel hub motor.
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Mahdal, Miroslav, Josef Dobeš, and Milada Kozubková. "Measurement of Aerodynamic and Acoustic Quantities Describing Flow around a Body Placed in a Wind Tunnel." Measurement Science Review 19, no. 1 (February 1, 2019): 20–28. http://dx.doi.org/10.2478/msr-2019-0004.

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Abstract Aerodynamically generated noise affects passenger comfort in cars, high-speed trains, and airplanes, and thus, automobile manufacturers aim for its reduction. Investigation methods of noise and vibration sources can be divided into two groups, i.e. experimental research and mathematical research. Recently, owing to the increase in computing power, research in aerodynamically generated noise (aero-acoustics) is beginning to use modern methods such as computational fluid dynamics or fluid-structure interaction. The mathematical model of turbulent flow is given by the system of partial differential equations, its solution is ambiguous and thus requires verification by physical experiment. The results of numerical methods are affected by the boundary conditions of high quality gained from the actual experiment. This article describes an application of complex measurement methodology in the aerodynamic and acoustic (vibro-acoustic) fields. The first part of the paper is focused on the specification of the experimental equipment, i.e. the wind tunnel, which was significantly upgraded in order to obtain the relevant aerodynamics and vibro-acoustics data. The paper presents specific results from the measurement of the aerodynamic and vibro-acoustic fields.
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Ruzzene, Massimo. "Sensors, dynamics, and control: Program overview and relevance to acoustics research." Journal of the Acoustical Society of America 137, no. 4 (April 2015): 2365. http://dx.doi.org/10.1121/1.4920594.

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von Flotow, A. H. "The acoustic limit of control of structural dynamics." Journal of the Acoustical Society of America 82, S1 (November 1987): S14. http://dx.doi.org/10.1121/1.2024667.

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Brunton, Steven. "Data-driven discovery of dynamics for control." Journal of the Acoustical Society of America 144, no. 3 (September 2018): 1743. http://dx.doi.org/10.1121/1.5067728.

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Tzou, H. S. "Non-linear joint dynamics and controls of jointed flexible structures with active and viscoelastic joint actuators." Journal of Sound and Vibration 143, no. 3 (December 1990): 407–22. http://dx.doi.org/10.1016/0022-460x(90)90732-f.

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Heertjes, Marcel, and Nathan van de Wouw. "Nonlinear Dynamics and Control of a Pneumatic Vibration Isolator." Journal of Vibration and Acoustics 128, no. 4 (April 11, 2005): 439–48. http://dx.doi.org/10.1115/1.2128642.

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The nonlinear dynamics of a single-degree-of-freedom pneumatic vibration isolator are studied. Based on a physical model, a nonsymmetric stiffness nonlinearity is derived to describe the stiffness property of the isolator. For a full nonlinear pneumatic isolator model, the response to two different types of disturbances is studied: forces applied to the isolated payload and base vibrations. The dynamic behavior of the isolator in case of a disturbance applied to the payload is studied using the generalized force-mobility function and features coexisting steady-state responses and a superharmonic resonance. Base vibrations transmitted via the isolator are studied on the basis of the generalized transmissibility function again showing rich nonlinear dynamic behavior. The presence of a nonsymmetric nonlinearity also induces high-energy low-frequency response to multiple high-frequency excitation. For both types of excitation, the nonlinear behavior is seriously compromising the performance of the isolator. To avoid any expression of nonlinearity whatsoever and, at the same time, to enhance the performance of the passive isolator, an overall nonlinear control design is proposed. It consists of a linear PID-based controller together with a nonlinear computed torque controller (CTC). For either linear or nonlinear control, the isolator performance is quantified in terms of generalized force mobility and transmissibility. The latter with a special focus on multiple high-frequency excitation.
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Jerrelind, Jenny, and Harry Dankowicz. "A Global Control Strategy for Efficient Control of a Braille Impact Hammer." Journal of Vibration and Acoustics 128, no. 2 (May 11, 2005): 184–89. http://dx.doi.org/10.1115/1.2159033.

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A combined control scheme relying on feedback-based local control in the vicinity of periodic system responses and global control based on a coarse-grained approximation to the nonlinear dynamics is developed to achieve a desirable dynamical behavior of a Braille printer impact hammer. The proposed control methodology introduces discrete changes in the position of a system discontinuity at opportune moments during the hammer motion while the hammer is away from the discontinuity, thereby exploiting the recurrent contacts with the discontinuity to achieve the desired changes in the transient dynamics. It is argued that, as the changes in the position of the discontinuity affect the motion only indirectly through changes in the timing and state at the subsequent contact, the control actuation can be applied over an interval of time during the free-flight motion as long as it is completed prior to contact. A forced, piecewise smooth, single-degree-of-freedom model of a Braille impact hammer is used to illustrate the methodology and to yield representative numerical results.
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Dissertations / Theses on the topic "Acoustics, Dynamics, and Controls"

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Campbell, Leckey Cara Ann. "Investigation of Ultrasonic Wave Scattering Effects using Computational Methods." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539623348.

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Advances in computational power and expanded access to computing clusters has made mathematical modeling of complex wave effects possible. We have used multi-core and cluster computing to implement analytical and numerical models of ultrasonic wave scattering in fluid and solid media (acoustic and elastic waves). We begin by implementing complicated analytical equations that describe the force upon spheres immersed in inviscid and viscous fluids due to an incident plane wave. Two real-world applications of acoustic force upon spheres are investigated using the mathematical formulations: emboli removal from cardiopulmonary bypass circuits using traveling waves and the micromanipulation of algal cells with standing waves to aid in biomass processing for algae biofuels. We then move on to consider wave scattering situations where analytical models do not exist: scattering of acoustic waves from multiple scatterers in fluids and Lamb wave scattering in solids. We use a numerical method called finite integration technique (FIT) to simulate wave behavior in three dimensions. The 3D simulations provide insight into experimental results for situations where 2D simulations would not be sufficient. The diverse set of scattering situations explored in this work show the broad applicability of the underlying principles and the computational tools that we have developed. Overall, our work shows that the movement towards better availability of large computational resources is opening up new ways to investigate complicated physics phenomena.
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Dieckman, Eric Allen. "Use of Pattern Classification Algorithms to Interpret Passive and Active Data Streams from a Walking-Speed Robotic Sensor Platform." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1539623643.

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In order to perform useful tasks for us, robots must have the ability to notice, recognize, and respond to objects and events in their environment. This requires the acquisition and synthesis of information from a variety of sensors. Here we investigate the performance of a number of sensor modalities in an unstructured outdoor environment, including the Microsoft Kinect, thermal infrared camera, and coffee can radar. Special attention is given to acoustic echolocation measurements of approaching vehicles, where an acoustic parametric array propagates an audible signal to the oncoming target and the Kinect microphone array records the reflected backscattered signal. Although useful information about the target is hidden inside the noisy time domain measurements, the Dynamic Wavelet Fingerprint process (DWFP) is used to create a time-frequency representation of the data. A small-dimensional feature vector is created for each measurement using an intelligent feature selection process for use in statistical pattern classification routines. Using our experimentally measured data from real vehicles at 50 m, this process is able to correctly classify vehicles into one of five classes with 94% accuracy. Fully three-dimensional simulations allow us to study the nonlinear beam propagation and interaction with real-world targets to improve classification results.
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Bingham, Jill Paisley. "Ultrasonic guided wave interpretation for structural health inspections." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539623538.

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Structural Health Management (SHM) combines the use of onboard sensors with artificial intelligence algorithms to automatically identify and monitor structural health issues. A fully integrated approach to SHM systems demands an understanding of the sensor output relative to the structure, along with sophisticated prognostic systems that automatically draw conclusions about structural integrity issues. Ultrasonic guided wave methods allow us to examine the interaction of multimode signals within key structural components. Since they propagate relatively long distances within plate- and shell-like structures, guided waves allow inspection of greater areas with fewer sensors, making this technique attractive for a variety of applications.;This dissertation describes the experimental development of automatic guided wave interpretation for three real world applications. Using the guided wave theories for idealized plates we have systematically developed techniques for identifying the mass loading of underwater limpet mines on US Navy ship hulls, characterizing type and bonding of protective coatings on large diameter pipelines, and detecting the thinning effects of corrosion on aluminum aircraft structural stringers. In each of these circumstances the signals received are too complex for interpretation without knowledge of the guided wave physics. We employ a signal processing technique called the Dynamic Wavelet Fingerprint Technique (DFWT) in order to render the guided wave mode information in two-dimensional binary images. The use of wavelets allows us to keep track of both time and scale features from the original signals. With simple image processing we have developed automatic extraction algorithms for features that correspond to the arrival times of the guided wave modes of interest for each of the applications. Due to the dispersive nature of the guided wave modes, the mode arrival times give details of the structure in the propagation path.;For further understanding of how the guided wave modes propagate through the real structures, we have developed parallel processing, 3D elastic wave simulations using the finite integration technique (EFIT). This full field, numeric simulation technique easily examines models too complex for analytical solutions. We have developed the algorithm to handle built up 3D structures as well as layers with different material properties and surface detail. The simulations produce informative visualizations of the guided wave modes in the structures as well as the output from sensors placed in the simulation space to mimic the placement from experiment. Using the previously developed mode extraction algorithms we were then able to compare our 3D EFIT data to their experimental counterparts with consistency.
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Rudd, Kevin Edward. "Parallel three-dimensional acoustic and elastic wave simulation methods with applications in nondestructive evaluation." W&M ScholarWorks, 2007. https://scholarworks.wm.edu/etd/1539623332.

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In this dissertation, we present two parallelized 3D simulation techniques for three-dimensional acoustic and elastic wave propagation based on the finite integration technique. We demonstrate their usefulness in solving real-world problems with examples in the three very different areas of nondestructive evaluation, medical imaging, and security screening. More precisely, these include concealed weapons detection, periodontal ultrasography, and guided wave inspection of complex piping systems. We have employed these simulation methods to study complex wave phenomena and to develop and test a variety of signal processing and hardware configurations. Simulation results are compared to experimental measurements to confirm the accuracy of the parallel simulation methods.
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Liu, Jiawei. "SIMULATION OF WHISTLE NOISE USING COMPUTATIONAL FLUID DYNAMICS AND ACOUSTIC FINITE ELEMENT SIMULATION." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/9.

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The prediction of sound generated from fluid flow has always been a difficult subject due to the nonlinearities in the governing equations. However, flow noise can now be simulated with the help of modern computation techniques and super computers. The research presented in this thesis uses the computational fluid dynamics (CFD) and the acoustic finite element method (FEM) in order to simulate the whistle noise caused by vortex shedding. The acoustic results were compared to both analytical solutions and experimental results to better understand the effects of turbulence models, fluid compressibility, and wall boundary meshes on the acoustic frequency response. In the case of the whistle, sound power and pressure levels are scaled since 2-D models are used to model 3-D phenomenon. The methodology for scaling the results is detailed.
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Bertoncini, Crystal Ann. "Applications of pattern classification to time-domain signals." W&M ScholarWorks, 2010. https://scholarworks.wm.edu/etd/1539623559.

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Many different kinds of physics are used in sensors that produce time-domain signals, such as ultrasonics, acoustics, seismology, and electromagnetics. The waveforms generated by these sensors are used to measure events or detect flaws in applications ranging from industrial to medical and defense-related domains. Interpreting the signals is challenging because of the complicated physics of the interaction of the fields with the materials and structures under study. often the method of interpreting the signal varies by the application, but automatic detection of events in signals is always useful in order to attain results quickly with less human error. One method of automatic interpretation of data is pattern classification, which is a statistical method that assigns predicted labels to raw data associated with known categories. In this work, we use pattern classification techniques to aid automatic detection of events in signals using features extracted by a particular application of the wavelet transform, the Dynamic Wavelet Fingerprint (DWFP), as well as features selected through physical interpretation of the individual applications. The wavelet feature extraction method is general for any time-domain signal, and the classification results can be improved by features drawn for the particular domain. The success of this technique is demonstrated through four applications: the development of an ultrasonographic periodontal probe, the identification of flaw type in Lamb wave tomographic scans of an aluminum pipe, prediction of roof falls in a limestone mine, and automatic identification of individual Radio Frequency Identification (RFID) tags regardless of its programmed code. The method has been shown to achieve high accuracy, sometimes as high as 98%.
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Seale, Michael David. "Propagation of guided acoustic waves in composite media." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539623884.

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Composite materials are being more widely used today by aerospace, automotive, and a number of other commercial industries because of their advantages over conventional metals. Composites are finding applications ranging from bicycle frames to the proposed High-Speed Civil Transport (HSCT). Determining the response to a variety of damage mechanisms is necessary for a complete understanding of the total use environment of composite structures. The objective of the research presented here is to provide a method of quantifying the amount of damage in composite materials for a number of different damage scenarios. Components which have non-visible damage, but have degraded performance, are of interest. at this level of damage, the safety margin designed into the structure may be compromised.;Nondestructive Evaluation (NDE) is a field of measurement physics where energy is imparted to a material and information is obtained from observing how the energy interacts with the system. Many different forms of energy can be used to obtain useful information from these measurements: acoustic, thermal, x-ray, optical, and electromagnetic. Among the many various techniques available, ultrasonic Lamb waves offer a convenient method of evaluating these composite materials. as a material is damaged, the elastic parameters of the structure change. Since the Lamb wave velocity depends on these properties, an effective tool exists to monitor damage in composites by measuring the velocity of these waves. Additionally, Lamb wave measurements are beneficial because they can propagate over long distances and are sensitive to the desired in-plane elastic properties of the material.;Presented in this study are the results involving the investigation of a variety of damage mechanisms (fatigue, thermal, and thermal-mechanical) using the Lamb wave technique. Two fatigue studies were conducted which showed that the change in modulus and change in velocity of the Lamb wave squared follow the same general trend. The Lamb wave velocity was also observed to decrease with increasing crack density. For the thermal damage study, the results showed that the velocity of the lowest order symmetric Lamb mode dropped significantly for extended thermal damage. When the experimental results were compared to model calculations, good agreement was observed for both fatigue and thermal damage. Finally, for thermal-mechanical damage, it was found that the Lamb wave technique was also able to predict a local defect in a specimen, which was later found to have a large delamination zone.;The Lamb wave velocity is a quantitative measurement and it has been shown by this work to be an effective tool in monitoring different types of damage in composites. Since the Lamb wave velocity depends on a variety of material properties, an ideal technique exists to monitor composites as damage is incurred. With the continued development of damage assessment techniques such as the Lamb wave method, the safety of such structures can be assured.
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Kamaldar, Mohammadreza. "DISCRETE-TIME ADAPTIVE CONTROL ALGORITHMS FOR REJECTION OF SINUSOIDAL DISTURBANCES." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/129.

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We present new adaptive control algorithms that address the problem of rejecting sinusoids with known frequencies that act on an unknown asymptotically stable linear time-invariant system. To achieve asymptotic disturbance rejection, adaptive control algorithms of this dissertation rely on limited or no system model information. These algorithms are developed in discrete time, meaning that the control computations use sampled-data measurements. We demonstrate the effectiveness of algorithms via analysis, numerical simulations, and experimental testings. We also present extensions to these algorithms that address systems with decentralized control architecture and systems subject to disturbances with unknown frequencies.
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Smith, David J. "An Advanced Controller for a Semi-Active Wheelchair Suspension." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/451.

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An Advanced Controller for a Semi-Active Wheelchair Suspension was designed, built and tested. The suspension consisted of a Goodyear 1S3-011 air spring, IQ Valves high speed proportional solenoid valve, and a custom made accumulator. Several controller designs specific to semi-active suspensions were designed and tested. The controllers investigated were skyhook, acceleration driven damping, and a combined control law employing both a dual and single sensor version. The implementation of skyhook control suffered performance degradation from the idealization due to particular elements of hardware, however acceleration driven damping showed a marked and statistically significant improvement over skyhook control, in hardware, by 14%. The combined control laws exhibited as yet unexplained transient behavior that produced results with low confidence in their veracity. All controllers proposed performed better than a conventional oil damper and spring type suspension.
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Malyarenko, Eugene V. "Lamb wave diffraction tomography." W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539623991.

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As the worldwide aviation fleet continues to age, methods for accurately predicting the presence of structural flaws, such as hidden corrosion and disbonds, that compromise air worthiness become increasingly necessary. Ultrasonic guided waves, Lamb waves, allow large sections of aircraft structures to be rapidly inspected. However, extracting quantitative information from Lamb wave data has always involved highly trained personnel with a detailed knowledge of mechanical waveguide physics. In addition, human inspection process tends to be highly subjective, slow and prone to errors. The only practical alternative to traditional inspection routine is a software expert system capable of interpreting data with minimum error and maximum speed and reliability. Such a system would use the laws of guided wave propagation and material parameters to help signal processing algorithms automatically extract information from digitized waveforms. This work discusses several practical approaches to building such an expert system.;The next step in the inspection process is data interpretation, and imaging is the most natural way to represent two-dimensional structures. Unlike conventional ultrasonic C-scan imaging that requires access to the whole inspected area, tomographic algorithms work with data collected over the perimeter of the sample. Combined with the ability of Lamb waves to travel over large distances, tomography becomes the method of choice for solving NDE problems. This work explores different tomographic reconstruction techniques to graphically represent the Lamb wave data in quantitative maps that can be easily interpreted by technicians. Because the velocity of Lamb waves depends on the thickness, the traveltimes of the fundamental modes can be converted into a thickness map of the inspected region. Lamb waves cannot penetrate through holes and other strongly scattering defects and the assumption of straight wave paths, essential for many tomographic algorithms, fails. Diffraction tomography is a way to incorporate scattering effects into tomographic algorithms in order to improve image quality and resolution. This work describes the iterative reconstruction procedure developed for the Lamb Wave tomography and allowing for ray bending correction for imaging of moderately scattering objects.
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Books on the topic "Acoustics, Dynamics, and Controls"

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Buck, John R. Single mode excitation in the shallow water acoustic channel using feedback control. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1996.

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Zhou, Lisheng, Wen Xu, Qianliu Cheng, and Hangfang Zhao, eds. Underwater Acoustics and Ocean Dynamics. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2422-1.

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Robinett, Rush D., Clark R. Dohrmann, G. Richard Eisler, John T. Feddema, Gordon G. Parker, David G. Wilson, and Dennis Stokes. Flexible Robot Dynamics and Controls. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0539-6.

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Robinett, Rush D. Flexible Robot Dynamics and Controls. Boston, MA: Springer US, 2002.

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Blevins, Robert D. Formulas for dynamics, acoustics and vibration. Chichester, West Sussex: John Wiley and Sons, Inc., 2015.

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Blevins, Robert D. Formulas for Dynamics, Acoustics and Vibration. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781119038122.

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Müller, Gerhard. Handbook of Engineering Acoustics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Howe, M. S. Acoustics of fluid-structure interactions. Cambridge: Cambridge University Press, 1998.

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Howe, M. S. Acoustics of fluid-structure interactions. Cambridge, UK: Cambridge University Press, 1998.

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Roskam, Jan. Airplane flight dynamics and automatic flight controls. Ottawa, Kan: Roskam Aviation and Engineering Corp., 1994.

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Book chapters on the topic "Acoustics, Dynamics, and Controls"

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Huepe, Cristián, Marco Colasso, and Rodrigo F. Cádiz. "Generating Music from Flocking Dynamics." In Controls and Art, 155–79. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03904-6_7.

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von Flotow, A. H. "The Acoustic Limit of Control of Structural Dynamics." In Large Space Structures: Dynamics and Control, 213–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83376-2_10.

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Beltzer, Abraham I. "Elements of Material Structure and Solid Dynamics." In Acoustics of Solids, 1–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83370-0_1.

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Cai, Jianping, Feng Lin, and Hock Soon Seah. "Dynamics Controls for Orthotropic Materials." In Graphical Simulation of Deformable Models, 67–84. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-51031-6_5.

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Castellini, Paolo, Paolo Chiariotti, Milena Martarelli, and Enrico Primo Tomasini. "Vibration and acoustic analysis of brake pads for quality control." In Structural Dynamics, Volume 3, 43–52. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9834-7_5.

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Chapman, N. Ross, and Juan Zeng. "Inference of Sound Attenuation in Marine Sediments from Modal Dispersion in Shallow Water." In Underwater Acoustics and Ocean Dynamics, 1–9. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2422-1_1.

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Sun, Xinyi, Desen Yang, Lianjin Hong, Shengguo Shi, and Hongkun Zhou. "Research of Axis Mismatches Between Pairs of Sensitive Elements of Underwater Acoustic Velocity Gradient Sensors." In Underwater Acoustics and Ocean Dynamics, 71–79. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2422-1_10.

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Kim, Junghun, Jee Woong Choi, and Jungyul Na. "A Passive Fathometer Technique for Bottom Profiling Using Ambient Noise." In Underwater Acoustics and Ocean Dynamics, 81–83. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2422-1_11.

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Li, Jian, Guangjie Han, Defu Zhou, Kai Tang, and Qingbang Han. "Target Motion Parameter Estimation for LOFARgrams Based on Waveguide Invariants." In Underwater Acoustics and Ocean Dynamics, 85–92. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2422-1_12.

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Zhu, Xian, and Huiliang Ge. "Source Localization by Maximizing the Longitudinal Correlation Using Waveguide Invariant Theory." In Underwater Acoustics and Ocean Dynamics, 93–98. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2422-1_13.

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Conference papers on the topic "Acoustics, Dynamics, and Controls"

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Shaw, L., S. Mcgrath, Pappu Murthy, and Subodh Mital. "Weapons bay acoustics - Passive or active control." In 37th Structure, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1617.

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Chishty, Wajid A., Uri Vandsburger, William R. Saunders, and William T. Baumann. "Effects of Combustor Acoustics on Fuel Spray Dynamics." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61325.

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An experimental liquid fuel LDI combustor, developed to study thermoacoustic instability processes and to test active combustion control systems, was found to demonstrate three distinct stability regimes, with system characteristics not reported in earlier literature. These observations led to a series of further investigations, both in reactive and non-reactive conditions, to gain an insight into effects of combustor acoustics on fuel spray dynamics. This paper presents only the non-reacting flow results, from both experimental and modeling investigations. The experimental setup and construction details of an isothermal acoustic rig are presented. Phase-locked PDA measurements of droplet velocities and diameters from a simplex atomizer spray were acquired, with and without combustor swirl co-airflow, under varying acoustic forcing conditions and spray feed pressures. Measurements made at four locations in the spray are related, in the paper, to these variations in mean and unsteady inputs. The dynamic behavior of the spray is then presented in terms of frequency response characteristics related to acoustic fields imposed on the spray. Finally, results from non-reacting spray modeling, predicting droplet trajectories, are reported. The modeling was done using the deterministic separated flow approach. These trajectories are compared to the reported experimental results to support preliminary explanations for the unique experimental observations of the swirl-stabilized kerosene flame in a single can combustor geometry.
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Houston, Brian, Martin Marcus, Joseph Bucaro, Brian Houston, Martin Marcus, and Joseph Bucaro. "Active blankets for the control of payload fairing interior acoustics." In 38th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1256.

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Niezrecki, Christopher, Harley Cudney, Christopher Niezrecki, and Harley Cudney. "Active control technology applied to rocket fairing structural vibrations and acoustics." In 38th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1255.

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Bauerheim, M., T. Jaravel, L. Esclapez, E. Riber, L. Y. M. Gicquel, B. Cuenot, M. Cazalens, S. Bourgois, and M. Rullaud. "Multiphase Flow LES Study of the Fuel Split Effects on Combustion Instabilities in an Ultra Low-NOx Annular Combustor." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-44139.

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This paper describes the application of a coupled Acoustic model/LES approach to assess the effect of fuel split on combustion instabilities in an industrial ultra low-NOx annular combustor. Multiphase flow LES and an analytical model (ATACAMAC) to predict thermoacoustic modes are combined to reveal and compare two mechanisms leading to thermoacoustic instabilities: 1) a gaseous type in the multi-point zone where acoustics generates vortex shedding, wrinkling the flame front and 2) a multiphase flow type in the pilot zone where acoustics can modify the liquid fuel transport and the evaporation process leading to gaseous fuel oscillations. The aim of this paper is to investigate these mechanisms by changing the fuel split (from 5% to 20%, mainly affecting the pilot zone and mechanism 2) and therefore assess which mechanism controls the flame dynamics. First, the eigenmodes of the annular chamber are investigated using the analytical model and validated by 3D Helmholtz simulations. Then, multiphase flow LES are forced at the eigenfrequencies of the chamber for three different fuel split values. Key features of the flow and flame dynamics are investigated. Results show that acoustic forcing generates gaseous fuel oscillations which strongly depend on the fuel split parameter. However, the global correlation between heat release fluctuations and acoustics highlights no dependency on the fuel split staging. It suggests that vortex shedding in the multi-point zone, almost not depending on the fuel split here, is the main feature controlling the flame dynamics for this LEMCOTEC engine.
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Gautam, Prashanta, and Abhilash J. Chandy. "Understanding Tire Acoustics Through Computational Fluid Dynamics (CFD) of Grooves With Deforming Walls." In ASME 2015 Noise Control and Acoustics Division Conference at InterNoise 2015. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ncad2015-5917.

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Reducing tire noise has been a topic of increased focus in the recent years in industrial countries in order to decrease road traffic noise. Computational fluid dynamics (CFD) simulations conducted using ANSYS FLUENT are presented here to provide a better understanding of the small-scale noise generation mechanisms due to air-pumping at the tire-road interface. The CFD model employs a large eddy simulation (LES) turbulence modeling approach, where the filtered compressible Navier-Stokes equations are solved for simple groove geometries with a moving bottom wall that represents the deformation due to the tire movement along the road surface. A horizontally moving wall is used to represent the motion of the tire groove in and out of the contact patch while the deformation of the groove is prescribed. Temporal and spatially accurate pressure fluctuations are utilized to determine sound pressure levels and dominant frequencies. In addition to an understanding of noise generation mechanisms in such grooves, the CFD model developed here can potentially provide a series of control parameters that can help optimize the tire performance in terms of tire acoustics.
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Ozer, Mehmet Bulent, and Thomas J. Royston. "Applications of the Sherman-Morrison Matrix Inversion Formula in Linear and Non-Linear Vibrations, Controls and Acoustics." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48554.

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Applications of the Sherman-Morrison matrix inversion formula are reviewed and demonstrated for several problems in sound and vibration control. The inversion formula enables one to easily separate the effect of a perturbation or subcomponent on the dynamic behavior of the overall system. Applications of this technique that are demonstrated here include: identifying optimal PZT electrical shunt parameter values to minimize sound radiation from a PZT-plate structure, identifying the optimal location and parameter values of a tuned dynamic vibration absorber attached to a multi-degree of freedom, damped system, and identifying and quantifying an isolated non-linearity in an otherwise linear system. Extensions to active control system design are also discussed.
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Noiray, Nicolas. "Linear Growth Rate Estimation From Dynamics and Statistics of Acoustic Signal Envelope in Turbulent Combustors." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58169.

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Considerable research and development efforts are required to meet the targets of future gas turbine technologies in terms of performance, emissions and operational flexibility. One of the recurring problem is the constructive coupling between flames and combustor’s acoustics. These thermoacoustic interactions can cause high amplitude dynamic pressure limit cycles, which reduce the lifetime of the hot-gas-path parts or in the worst case scenario destroy these mechanical components as a result of a sudden catastrophic event. It is shown in this paper that the dynamics and the statistics of the acoustic signal envelope can be used to identify the linear growth rates hidden behind the observed pulsations, and the results are validated against numerical simulations. This is a major step forward and it will contribute to the development of future gas turbine combustors, because the knowledge of these linear growth rates is essential to develop robust active and passive systems to control these combustion instabilities.
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Chen, Jiarong, and Qingze Zou. "Data-Driven Post-Filtering of Acoustics Noise in Atomic Force Microscope Imaging." In ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3265.

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Abstract This paper presents a data-driven dynamics-based filtering approach to eliminate acoustic noise-caused distortion in images of atomic force microscope (AFM). AFM operations are sensitive to external noise as disturbances including acoustic noise as disturbances to the probe-sample interaction directly results in distortions in AFM imaging. Although conventional passive noise cancellation has been employed, limitation exists and residual noise still persists. Advanced online control techniques face difficulty in capturing the complex noise dynamic and limited system bandwidth imposed by the robustness requirement. Therefore, In this work, we propose a finite-impulse-response (FIR) based post-filtering approach to remove the noise-caused distortion in AFM images. Experimental implementation is presented and discussed to illustrate the proposed technique.
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Sekhri, Rahul, Marco P. Schoen, Feng Lin, and Brian G. Williams. "Experimental Study of the Dynamics of Synthetic Jet Actuators With Different Orifice Sizes." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79777.

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Synthetic jet actuators (SJA) are one of the newly developed actuators that have demonstrated its great potentials in active flow applications, particularly in closed-loop flow controls. The SJA contains a piezoelectric membrane in a cavity, which vibrates and generates a periodic jet at the exit of the cavity through an orifice that is mounted flush with the solid wall of the flow field. In order to design the feedback control laws, it is crucial to be able to quantitatively capture the dynamics of SJA. In this paper, the dynamics of SJAs with six different orifice sizes are experimentally investigated. A synthesis using system identification for the purpose of constructing mathematical models of these zero mass-flux actuators is offered. The experimental study includes two output parameters, the acoustic sound pressure generated by the SJA and the mechanical membrane vibration of the SJA. State-space models for these outputs (sound pressure and mechanical vibration) are developed as a function of orifice size. These results form a foundation for future intelligent design of SJA.
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Reports on the topic "Acoustics, Dynamics, and Controls"

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Baz, Amr R. Virtual Structural Dynamics, Acoustics and Control. Fort Belvoir, VA: Defense Technical Information Center, June 2001. http://dx.doi.org/10.21236/ada395200.

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Cai, Y., S. S. Chen, and D. M. Rote. Dynamics and controls in maglev systems. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/10136539.

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Cai, Y., S. S. Chen, and D. M. Rote. Dynamics and controls in maglev systems. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/6662716.

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Coe, Ryan, Giorgio Bacelli, Dominic Forbush, Steven Spencer, Kevin Dullea, Bret Bosma, and Pedro Lomonaco. FOSWEC dynamics and controls test report. Office of Scientific and Technical Information (OSTI), October 2020. http://dx.doi.org/10.2172/1717884.

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Coe, Ryan Geoffrey, Giorgio Bacelli, Steven James Spencer, Dominic Forbush, and Kevin Dullea. Advanced WEC Dynamics and Controls MASK3 Test. Office of Scientific and Technical Information (OSTI), December 2019. http://dx.doi.org/10.2172/1592850.

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Coe, Ryan Geoffrey, Giorgio Bacelli, David G. Wilson, and David Charles Patterson. Advanced WEC Dynamics & Controls FY16 Testing Report. Office of Scientific and Technical Information (OSTI), October 2016. http://dx.doi.org/10.2172/1330189.

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Ceccio, Steven L., and David Dowling. Dynamics and Acoustics of Trailing Edge Flows at High Reynolds Numbers. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada416712.

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Puta, Mircea. Geometrical Aspects in the Rigid Body Dynamics with Three Quadratic Controls. GIQ, 2012. http://dx.doi.org/10.7546/giq-1-2000-209-224.

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Kiel, Barry V., Amy Lynch, Stanislav Kostka, Beth Huelskamp, Reza Kashani, and Nick Parr. The Influence of Stoichiometry and Flame-Holder Shape on Flame Dynamics and Acoustics (Preprint). Fort Belvoir, VA: Defense Technical Information Center, April 2012. http://dx.doi.org/10.21236/ada560400.

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Marc Cremer, Kirsi St. Marie, and Dave Wang. Computational Fluid Dynamics Based Investigation of Sensitivity of Furnace Operational Conditions to Burner Flow Controls. US: Reaction Engineering International, April 2003. http://dx.doi.org/10.2172/899455.

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