DOCSLIB.ORG

ICSV22 Template

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
ICSV22 Template 22nd International Congress on Sound and Vibration 2015 (ICSV 22) Florence, Italy 12-16 July 2015 Volume 2 of 8 Editors: Malcolm J. Crocker Marek Pawelczyk Francesca Pedrielli Eleonora Carletti Sergio Luzzi ISBN: 978-1-5108-0903-1 Printed from e-media with permission by: Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 Some format issues inherent in the e-media version may also appear in this print version. Copyright© (2015) by the International Institute of Acoustics & Vibration All rights reserved. Printed by Curran Associates, Inc. (2015) For permission requests, please contact the International Institute of Acoustics & Vibration at the address below. International Institute of Acoustics & Vibration c/o Dr. Malcolm J. Crocker 1418 Wiggins Hall Auburn, AL 36849, USA Phone: (334) 844-3248 Fax: (334) 844-3306 www.iiav.org Additional copies of this publication are available from: Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 USA Phone: 845-758-0400 Fax: 845-758-2634 Email: [email protected] Web: www.proceedings.com TABLE OF CONTENTS VOLUME 1 CONVERSION OF NEARFIELD ACOUSTIC HOLOGRAPHY METHOD FOR LOW FREQUENCY LOCALIZATION...............................................................................................................................................................................................1 Nagamatsu Masao THE SIMULATION OF ACOUSTIC WAVE PROPAGATION WITHIN NETWORKED PIPE SYSTEMS – DEVELOPMENT AND EXPERIMENTAL VALIDATION........................................................................................................................9 Tao Linan, Groves Keir, Lennox Barry QUANTITATIVE ULTRASONIC IMAGING OF BONES .......................................................................................................................17 Guillermin Régine, Lasaygues Philippe, Rabau Guy ON DEFECT IMAGING USING ULTRASONICS FOR STRUCTURAL HEALTH MONITORING ...............................................23 Nguyen Thompson, Sternini Simone, Lanza Di Scalea Francesco COMPARISON OF REGULARIZATIONS FOR SOUND SOURCE IDENTIFICATION BY INVERSE BOUNDARY ELEMENT METHOD ............................................................................................................................................................31 Lv Guoxue, Xiao Youhong ARRAY PROCESSING WITH REPLICATED TRACE WAVELENGTHS ..........................................................................................38 Cray Benjamin SOUND SOURCE RECONSTRUCTION TECHNIQUES FOR JET NOISE BY INVERSE ACOUSTIC ANALYSIS........................................................................................................................................................................................................43 Tabuchi Satoshi, Yamaguchi Zenzo, Kinoshita Shinichi NEARFIELD ACOUSTIC HOLOGRAPHY IN A MOVING MEDIUM VIA EQUIVALENT SOURCE METHOD AND PARTICLE VELOCITY MEASUREMENTS....................................................................................................................................51 Dong Bi-Chun, Joseph Phillip, Bi Chuan-Xing, Zhang Xiao-Zheng PLATE MODAL AMPLITUDE DETERMINATION FROM MICROPHONE ARRAY DATA .........................................................57 Moers Elise, Lopez-Arteaga Ines, Nijmeijer Henk USE OF THE BEAMFORMING TECHNIQUE TO CREATE PSYCHOACOUSTIC MAPS .............................................................65 Araujo Frederico, Castro Pinto Fernando IDENTIFICATION OF NOISE SOURCES IN REVERBERANT SOUND FIELDS USING BEAMFORMING ..............................73 Santos Eduardo, Pinto Fernando ACOUSTIC WAVE PROPAGATION IN METAL PIPES ........................................................................................................................81 Rimlyand Vladimir, Drachev Kirill AUTOMATIC MICROPHONE LOCALIZATION INSIDE A CAR CABIN FOR EXPERIMENTAL ACOUSTIC MODAL ANALYSIS........................................................................................................................................................................................88 Accardo Giampiero, Cornelis Bram, Janssens Karl, Peeters Bart EXPERIMENTAL VALIDATION OF ACOUSTIC SCORING SYSTEM..............................................................................................96 Go Yeong-Ju, Choi Donghun, Lee Jaehyung, Choi Jong-Soo CMUTS WITH VENTED CAVITIES FOR AIRBORNE ULTRASOUND IMAGING APPLICATIONS..........................................99 Apte Nikhil, Nikoozadeh Amin, Khuri-Yakub B., Park Kwan-Kyu ACOUSTIC METHODS OF MICROPHONE CALIBRATION .............................................................................................................103 Salzano Carmine, Walber Chad M., Nowak Mark, Larratta Nicholas SMARTPHONE AS NOISE LEVEL METER? .........................................................................................................................................110 Fogola Jacopo, Masera Stefano, Bevacqua Vincenzo DESIGN FOR A SELF-CALIBRATING MICROPHONE SYSTEM USING A CLUSTER OF MEMS MICROPHONES ...........................................................................................................................................................................................118 Piper Benjamin, Barham Richard, Sotirakopoulos Kostas A NOVEL IN-SITU CALIBRATION METHOD FOR ACOUSTIC PARTICLE VELOCITY SENSORS BASED ON SURFACE VELOCITY..........................................................................................................................................................................124 Fernandez Comesaña Daniel, Tijs Emiel, Janszen Martijn, Carrillo Pousa Graciano PERFORMANCE COMPARISON OF DIFFERENT CONTACT MICROPHONES USED FOR VOICE MONITORING...............................................................................................................................................................................................132 Castellana Antonella, Carullo Alessio, Casassa Federico, Astolfi Arianna, Pavese Lorenzo, Puglisi Giuseppina Emma DEVELOPMENT OF AN INTEGRATED SMART SENSOR SYSTEM FOR SOUND SYNTHESIS AND REPRODUCTION IN TELEPRESENCE ..................................................................................................................................................140 Cha Yongwon, Imran Muhammad, Seo Jong Gak, Jeon Jin Yong TEMPERATURE AND SENSITIVITY ANALYSIS ON MEMS VIBRATION SENSORS WITH DIFFERENT PRINCIPLES OF OPERATION..................................................................................................................................................................144 Klusacek Stanislav, Havranek Zdenek, Hasik Stanislav, Fialka Jiri, Benes Petr NUMERICAL AND EXPERIMENTAL DETERMINATION OF IMPEDANCE CHARACTERISTICS OF PZT ELEMENTS FOR ACOUSTIC EMISSION SENSORS ...........................................................................................................................152 Havranek Zdenek, Fialka Jiri, Benes Petr, Klusacek Stanislav PERMANENT MAGNET SYNCHRONOUS MOTOR AS A UNIVERSAL BROADBAND TORSIONAL VIBRATION EXCITER................................................................................................................................................................................160 Kimpian Tibor, Augusztinovicz Fulop VARIATION OF TEMPERATURE TENSION EFFECT IN STRUCTURAL HEALTH MONITORING OF BEAM BASED ON THE ELECTRO-MECHANICAL IMPEDANCE METHOD ...............................................................................167 Bakhtiari-Nejad Firooz, Sepehry Naserodin, Shamshirsaz Mahnaz A REAL-TIME ANVIL MOTION MONITORING SYSTEM ................................................................................................................175 Wu Lixue DESIGN AND EVALUATION OF PROBE WITH THREE DEGREE-OF-FREEDOM FOR NON- DESTRUCTIVE TEST USING THREE-DIMENSIONAL FINITE ELEMENT METHOD...............................................................183 Aoyanagi Masafumi, Wakatsuki Naoto, Mizutani Koichi, Tadashi Ebihara TEST BENCH FOR THE VIBROACOUSTIC RESEARCHING OF THE PNEUMATIC SYSTEMS AGGREGATES AND PIPE FITTINGS......................................................................................................................................................190 Balyaba Maxim, Kryuchkov Alexander, Shabanov Konstantin, Ermilov Mikhail CONTACTLESS FIBER-OPTIC VIBRATION SENSORS FOR EXPLOSIVE MANUFACTURINGS...........................................198 Matyunin Sergey, Babaev Orkhan IN SITU ABSORPTION MEASUREMENTS USING A PORTABLE FLANGED IMPEDANCE TUBE.........................................204 Murray Paul, Kunio Jason, Christensen Leif Slot, Larsen Flemming Schultz DEVELOPMENT OF SENSING METHODOLOGY OF NANOTOXIC MATERIAL USING MEASUREMENT OF NATURAL FREQUENCY .....................................................................................................................................................................212 Jang Kuewhan, You Juneseok, Park Chanho, Park Jinsung, Na Sungsoo RELATION BETWEEN SOUND SOURCES LAYOUT AND ERROR OF SELF-LOCALIZATION METHOD IN TWO-DIMENSION FOR MOBILE ROBOT USING MICROPHONE ARRAY .................................................................................216 Ogiso Satoki, Kawagishi Takuji, Mizutani Koichi, Wakatsuki Naoto, Zempo Keiichi ESTIMATION OF FLIGHT PARAMETERS OF A STEADY STRAIGHT AND LEVEL FLIGHT SOURCE USING TIME-FREQUENCY ANALYSIS .................................................................................................................................................224 Jung Ookjin, Go Yeong-Ju, Lee Jaehyung, Choi
Load more

Recommended publications
  • Self-Oscillation
    Self-oscillation Alejandro Jenkins∗ High Energy Physics, 505 Keen Building, Florida State University, Tallahassee, FL 32306-4350, USA Physicists are very familiar with forced and parametric resonance, but usually not with self- oscillation, a property of certain dynamical systems that gives rise to a great variety of vibrations, both useful and destructive. In a self-oscillator, the driving force is controlled by the oscillation itself so that it acts in phase with the velocity, causing a negative damping that feeds energy into the vi- bration: no external rate needs to be adjusted to the resonant frequency. The famous collapse of the Tacoma Narrows bridge in 1940, often attributed by introductory physics texts to forced resonance, was actually a self-oscillation, as was the swaying of the London Millennium Footbridge in 2000. Clocks are self-oscillators, as are bowed and wind musical instruments. The heart is a \relaxation oscillator," i.e., a non-sinusoidal self-oscillator whose period is determined by sudden, nonlinear switching at thresholds. We review the general criterion that determines whether a linear system can self-oscillate. We then describe the limiting cycles of the simplest nonlinear self-oscillators, as well as the ability of two or more coupled self-oscillators to become spontaneously synchronized (\entrained"). We characterize the operation of motors as self-oscillation and prove a theorem about their limit efficiency, of which Carnot's theorem for heat engines appears as a special case. We briefly discuss how self-oscillation applies to servomechanisms, Cepheid variable stars, lasers, and the macroeconomic business cycle, among other applications. Our emphasis throughout is on the energetics of self-oscillation, often neglected by the literature on nonlinear dynamical systems.
    [Show full text]
  • The Rijke Tube - a Thermo-Acoustic Device
    GENERAL I ARTICLE The Rijke Tube - A Thermo-acoustic Device Shekhar M Sarpotdar, N Ananthkrishnan and S D Sharma Introduction The Rijke tube is simply a cylindrical tube with both ends open and a heat source placed inside it. The heat source may be a flame or an electrical heating element. Traditionally, the tube is positioned vertically on a stand (or even in your hand) and the Shekhar Sarpotdar is presently a Graduate heat source is introduced from below into the tube (Figure 1). Student, in MMAE For certain ranges of position of the heat source within the tube, department of the Rijke tube emits a loud sound. This phenomenon was liT, Chicago, USA. discovered by Rijke around 1850, and is therefore called the Rijke phenomenon. Sound production in the Rijke tube is a classic example of a thermo-acoustic phenomenon 1. Thermo­ acoustics refers to the creation of sound in a device due to the transfer of energy from a thermal source (e.g., a flame) to acous­ tic waves set up in the device 2 • N Ananthkrishnan research interests revolve When some of the acoustic energy escapes from the device and around the dynamics reaches our ears, it is perceived as sound. The Rijke tube is one and control of nonlinear phenomena in aircraft of the simplest examples of a thermo-acoustic device - one that flight, compressor flows, converts heat into acoustic energy (sound). liquid slosh, and combus­ tion acoustics. Rijke's original interest in the phenomenon appears to have been from the point of view of musical acoustics.
    [Show full text]
  • Validation of a Physics‐Based Low‐Order Thermo‐Acoustic Model of a Liquid‐Fueled Gas
    Validation of a Physics Based Low Order Thermo Acoustic Model of a Liquid Fueled‐‐‐ Gas Turbine‐‐‐ Combustor‐‐‐ and its Application for Predicting‐‐‐ Combustion Driven Oscillations A dissertation submitted to the Graduate School of the University of Cincinnati in partial fulfilment of the requirements for the degree of Doctor of Philosophy (Ph.D.) In the Department of Aerospace Engineering and Engineering Mechanics of the College of Engineering and Applied Sciences By Michael Knadler B.S., Aerospace Engineering, University of Cincinnati, 2011 November 2017 Committee Chair: Dr. Jongguen Lee, Ph.D. Abstract This research validates a physics based model for the thermo-acoustic behavior of a liquid-fueled gas turbine combustor as a tool for diagnosing the cause of combustion oscillations. A single nozzle, acoustically tunable gas turbine combustion rig fueled with Jet-A was built capable of operating in the unsteady combustion regime. A parametric study was performed with the experimental rig to determine the operating conditions resulting in thermoacoustic instabilities. The flame transfer function has been determined for varying fuel injection and flame stabilization arrangements to better understand the feedback loop concerning the heat release and acoustics. The acoustic impedance of the boundaries of the combustion system was experimentally determined. The results were implemented in a COMSOL Multiphysics model as complex impedance boundary conditions at the inlet and exit and a source term to model the flame and heat release. The validity of that model was determined based on an eigenvalue study comparing both the frequency and growth rate of the eigenvalues with the experimentally measured frequencies and pressures of the stable and unstable operating conditions.
    [Show full text]
  • Theremin: Ether Music and Espionage Free Download
    THEREMIN: ETHER MUSIC AND ESPIONAGE FREE DOWNLOAD Albert Glinsky,Robert Moog | 480 pages | 02 Feb 2005 | University of Illinois Press | 9780252072758 | English | Baltimore, United States THEREMIN 100 Write a review See all reviews Write a review. Now I know it was my father. From Scratch is a collection of Tenney's hard-to-find writings arranged, edited, and revised Keri Latimer rated it it was amazing Jan 16, Pyrophone Rijke tube Singing Tesla coil. In the vegetable garden behind his parents' summer home, just outside the city, he constructed his own observatory where he discovered a new star. Encompassing societies of origin and destination from around the world, A Century of Transnationalism shows Tesla guitarist Frank Hannon used a theremin in the band's song "Edison's Medicine" from the album Psychotic Supper. It seemed to him "unlike others who operated more with Theremin: Ether Music and Espionage indices, expressions, and formulas shaded with symbolism. The centrifugal force of the mammoth rotating mechanism nearly tore apart the housing, and the horsepower required of its steam turbine engine was staggering. One of these electronics enthusiasts, Robert Moogbegan building theremins in the s, while he was a high-school student. That's where it all began. Many thousands are dying of famine and cold. Lists with This Book. This field, which extends to an active distance of a few feet, emanates from the two antennas; the vertical pitch control rod on the top of the cabinet, and the horizontal volume control loop on the side. Pickup not available. Mobile apps. It was about objects around us connected to our feelings Original Title.
    [Show full text]
  • Rijke Tube Cancellation Device for Helicopters
    (19) TZZ _T (11) EP 2 568 468 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: G10K 11/175 (2006.01) 08.01.2014 Bulletin 2014/02 (21) Application number: 11189425.9 (22) Date of filing: 16.11.2011 (54) Rijke tube cancellation device for helicopters Rijke-Rohr-Unterdrückungsvorrichtung für Helikopter Dispositif pour l’annulation du tuyau de Rijke pour des hélicoptères (84) Designated Contracting States: (56) References cited: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB US-A- 3 685 610 GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR • CARVALHO J A ET AL: "Definition of heater location to drive maximum amplitude acoustic (30) Priority: 07.09.2011 US 201113227231 oscillations in a Rijke tube", COMBUSTION AND FLAME, ELSEVIER SCIENCE PUBLISHING CO., (43) Date of publication of application: INC., NEW YORK, NY.; US, AMSTERDAM, NL, vol. 13.03.2013 Bulletin 2013/11 76, no. 1, 1 April 1989 (1989-04-01), pages 17-27, XP023608572, ISSN: 0010-2180, DOI: (73) Proprietor: Bell Helicopter Textron Inc. 10.1016/0010-2180(89)90073-4 [retrieved on Fort Worth, TX 76101 (US) 1989-04-01] • CHATTERJEE P ET AL: "On the spectral (72) Inventor: Sparks, David characteristics of a self-excited Rijke tube Forth Worth, TX 76118 (US) combustor-numerical simulation and experimental measurements", JOURNAL OF (74) Representative: Lawrence, John SOUND & VIBRATION, LONDON, GB, vol. 283, no. Barker Brettell LLP 3-5, 20 May 2005 (2005-05-20), pages 573-588, 100 Hagley Road XP004830542, ISSN: 0022-460X, DOI: Edgbaston 10.1016/J.JSV.2004.04.019 Birmingham • COLLYER A A ET AL: "Generation of harmonics B16 8QQ (GB) in a Rijke tube by using a single heating element", JOURNAL OF SOUND & VIBRATION, LONDON, GB, vol.
    [Show full text]
  • Thermoacoustics Analysis in a Rijke Tube
    ICONS 2018 : The Thirteenth International Conference on Systems Thermoacoustics Analysis in a Rijke Tube Israel Mejia Alonso Celso Eduardo Cruz González Eloy Edmundo Rodríguez Vázquez Engineering Center for Industrial Development Carlos Alexander Núñez Martín (CIDESI) Celso Eduardo Cruz González Advanced Manufacturing Department National Research Laboratory on Cooling Cd. de México, México Technology (LaNITeF) email: [email protected] CIDESI Querétaro, México email: {imejia, erodriguez}@cidesi.edu.mx [email protected] Abstract—This paper deals with the perturbation induced by another analysis included premixed fluid and Helmholtz the gauge pressure alongside a combustion chamber. This resonator [8]. perturbation is modeled by acoustic pressure, measured at the The gas turbine combustion modelling and simulations end of the combustor. These vibration modes are obtained and the acoustic phenomenon implies the necessity of experimentally using Fourier Analysis. The analytic model of implementing a control algorithm. The basic gas turbine Pressure Distribution Equation (PDE) on can combustor is model equations [9] are important for analysis, design and based on a wave equation. This paper describes the procedure simulation of a control system especially for Combined that was carried out to obtain the temperature of a column of Cycle Power Plants (CCPP) [10] and [11]. Focusing on hot air inside a simple combustor. The Rijke tube was used acoustics, new passive and active control techniques for such with the aim of laying the foundations of a future instabilities have been studied and developed [12] as well as thermoacoustic phenomenon analysis. The contribution of this work is spatial interpretation of pressure waves and techniques of Adaptive Sliding Phasor Averaged Control displacement in a chamber during thermoacoustic phenomena.
    [Show full text]
  • Teadushuvihariduse Näidisõppekava
    Teadushuvihariduse näidisõppekava TEADUS JA TEATER JA TEADVUS! (TEADUSTEATER) III KOOLIASTMELE (7.-9. KLASS) ● Alustamise tingimused: Osalejatelt oodatakse rahuldavaid esinemiskogemusi (referaadi ettekanded, tantsu- ja laulukogemised jms), huvi teaduse vastu ning loogilist mõtlemist. ● Kestus: 3 õppeaastat, 2 ak. tundi nädalas, kokku 60 + 60 + 60 = 180 tundi SISUKORD A. Üldosa 3 Õppekava lühikirjeldus 3 Alusväärtused 3 Õppe korraldus 4 Õppe-kasvatuslikud eesmärgid 4 Õppeteemad (olulisemad üldteemad) 5 Tagasisidestamine 5 Ringijuhendaja profiili kirjeldus 5 Vajalikud töö-, õppe- ja katsevahendid 6 Õpiväljundid 6 I õppeaasta 6 B. Õppesisu kolmel õppeaastal 7 l õppeaasta 7 1. Ohutus: tuli (6 tundi) 7 2. Teater ja improvisatsioon: kindlus, vabadus ja mäng (4 tundi) 9 3. Kriitiline analüüs ja teaduslik meetod (4 tundi) 10 4. Füüsika ja matemaatika: rõhk ja õhk (12 tundi) 11 5. Keemia ja materjaliteadus: kodukeemia (8 tundi) 15 6. Roheline, valge ja pruun loodus: toiduteadus (8 tundi) 17 7. Inimese sotsioloogia, psühholoogia ja ajalugu: teadvus (6 tundi) 19 1 8. Esinemine: kehakeel ja hääl (4 tundi) 21 9. Praktika: esimene etendus (8 tundi) 22 ll õppeaasta 23 1. Ohutus: elekter (12 tundi) 23 2. Teater ja improvisatsioon: ideede müümine (4 tundi) 26 3. Kriitiline analüüs ja teaduslik meetod: seosed ja põhjuslikkus (4 tundi) 28 4. Füüsika ja matemaatika: akustika ehk heliteadus (10 tundi) 29 5. Keemia ja materjaliteadus: temperatuur ja aine olekud (10 tundi) 34 6. Roheline, valge ja pruun loodus: vesi (6 tundi) 39 7. Inimese sotsioloogia, psühholoogia ja ajalugu: illusioonid (4 tundi) 41 8. Esinemine: mustkunst (4 tundi) 42 9. Praktika: originaalne katse (6 tundi) 43 lll õppeaasta 44 1. Ohutus: pauk (6 tundi) 44 2.
    [Show full text]
  • Advancements in Thermophones: Sound Generation from Nanoscopic Heaters
    Advancements in Thermophones: Sound Generation from Nanoscopic Heaters Nathanael Mayo Researchers adapt solid-state sound-generation techniques discovered Address: shortly after the invention of the telephone. Naval Undersea Warfare Center Introduction Sensors and Sonar It is often stated that “nothing is new” to portray the idea that everything that 1176 Howell Street we do and learn is, in one way or another, a recycled version of something that Newport, Rhode Island 02841 someone else has done before. I find this statement to be true everywhere I look, USA and in the instances in which it didn’t appear to be true, it was only because I Email: hadn’t looked hard enough. Of course, there is nothing wrong with this. It seems [email protected] only natural that we learn through imitation before we can then adapt what we’ve learned to something else by “standing on the shoulders of giants,” to borrow a metaphor. Even, at times, when our insights seem serendipitous or of our own accord, another has already come across the same concept before. Such was the case when, in 2008, a group from Tsinghua University in Beijing, China, passed an alternating electric current through a thin, transparent sheet of carbon nano- tubes (CNTs) and discovered that it produced sound (Barras, 2008). With a bit of investigation, they found that such a device, called a thermophone, had existed for over a century but that the modern nanomaterial had simply made it much more efficient than those of previous generations. In fact, there is currently an entire field of physics called thermoacoustics that is undergoing a revitalization and progressing because of advancements in modern technologies such as lasers, computing, and very large scale integration (VLSI) that enables the manufacture and patterning of nanoscale materials.
    [Show full text]
  • Rijke Organ: Modeling and Control of Array of Rijke Tubes
    Preprints of the 21st IFAC World Congress (Virtual) Berlin, Germany, July 12-17, 2020 Rijke Organ: Modeling and Control of Array of Rijke Tubes KriˇstofPuˇcejdl ZdenˇekHur´ak Jiˇr´ıZem´anek Faculty of Electrical Engineering, Czech Technical University in Prague, CZ fkristof.pucejdl, hurak, [email protected] Abstract: Rijke tube is a popular physical experiment demonstrating a spontaneous generation of sound in an open vertical pipe with a heat source. This laboratory instance of thermoacoustic instability has been researched due to its significance in practical thermoacoustic systems. We revisit the experiment, focusing on the possible use of the Rijke tube as a musical instrument. The novelty presented in this paper consists in shifting the goal from sound suppression to active sound generation. This called for modifying the previously investigated methods for stabilization of thermoacoustic oscillations into their excitation and control of their amplitude. On our way towards this goal, we developed a time-domain mathematical model that considers the nonlinear and time-varying aspects of the Rijke tube. The model extends the existing modeling and analysis approaches, which are mainly based in frequency domain. We also present an extension of the basic laboratory setup in the form of an array of Rijke tubes equipped with a single speaker used to control multiple Rijke tubes with different natural frequencies simultaneously. Keywords: Rijke tube, Rijke organ, System modeling, Thermoacoustic instability, Time-delay systems 1. INTRODUCTION further investigate and describe the problem and compare experimental results with a system modal description. Discovered in 1859 by a Dutch physicist Petrus Leonardus Besides the active control approaches, passive stabilization Rijke, a static source of heat|as simple as a wire mesh techniques have also been enjoying renewed interest of preheated with a burner|placed inside a vertically ori- researchers recently: Zalluhoglu and Olgac (2018) show the ented open pipe gives rise to a loud humming noise.
    [Show full text]
  • Ava PDF Siit!
    Teadushuvihariduse näidisõppekava TEADUS JA TEATER JA TEADVUS! (TEADUSTEATER) III KOOLIASTMELE (7.–9. KLASS) ● Alustamise tingimused: osalejatelt oodatakse rahuldavaid esinemiskogemusi (referaadi ettekanded, tantsu- ja laulukogemused jms), huvi teaduse vastu ja loogilist mõtlemist. ● Kestus: 3 õppeaastat, 2 akadeemilist tundi nädalas, kokku 60 + 60 + 60 = 180 tundi. SISUKORD Üldosa ...................................................................................................................................................... 3 1. Näidisõppekava lühikirjeldus ................................................................................................. 3 2. Alusväärtused ........................................................................................................................ 3 3. Õppekorraldus ....................................................................................................................... 3 4. Õppekasvatuslikud eesmärgid ............................................................................................... 4 5. Õppeteemad (olulisemad üldteemad) ................................................................................... 4 6. Tagasiside ............................................................................................................................... 5 7. Ringi juhendaja profiili kirjeldus............................................................................................. 5 8. Vajalikud töö-, õppe- ja katsevahendid ................................................................................
    [Show full text]
  • Experimental Music Since 1970 Free Download
    EXPERIMENTAL MUSIC SINCE 1970 FREE DOWNLOAD Jennie Gottschalk | 304 pages | 11 Aug 2016 | Bloomsbury Publishing PLC | 9781628922479 | English | New York, United States Experimental musical instrument John Cage — was an American composer who pioneered the fields of chance musicelectronic music and unorthodox use of musical instruments. Post to Cancel. For a long time. Through such focused attention, the music asks us to listen actively to what usually is passively endured, whether this latter consists of the natural or built environment, the acoustic properties of physical spaces and living beings, the spatial distribution of sound, the sonic qualities of everyday objects and materials, or the temporal dimension of sound. It pushes past that which is known to discover what lies beyond it, finding new knowledge, forms, and relationships, or accepting Experimental Music Since 1970 state of uncertainty. Jennie Gottschalk takes a fresh and independent look at experimental music of the last forty years, finding both Experimental Music Since 1970 of continuation from the previous era and many novel and heartening developments. The Experimental Music Since 1970 "experimental" in the former cases "is apt, providing it is understood not as descriptive Experimental Music Since 1970 an act to be later judged in terms of success or failure, but simply as of an act the outcome of which is unknown" Experimental Music Since 1970 Uakti WAHK-chee is a Brazilian instrumental musical group active in the s known for using custom-made instruments built by the group. Founded inThe Vegetable Orchestra use instruments made entirely from fresh vegetables. It is a wind instrument or aerophoneclassifiable as Experimental Music Since 1970 woodwind rather than brass instrument despite being made of metal, because it has a reed cf.
    [Show full text]
  • Conclusion – Beyond Sensations Increasingly Divergent Points of View in Acoustics – Analytic and Holistic
    Conclusion – Beyond Sensations Instruments constitute a large part of what we know about Rudolph Koenig. They chronicle scientific, artisanal, social and deeply personal dimensions of their maker. And they continue to speak. I have sounded hundreds of tuning forks around Europe and North America, which resonate with a distinctively even, colourless and pure sound, one that came into being under specific conditions in the workshop cul- ture of nineteenth-century Paris. For well over 150 years, thousands of students have been introduced to the science of sound through the influence of Koenig’s atelier. The following chapters presented a portrait of this space and its role in the estab- lishment of a radically altered novel material foundation for the scientific study of sound between the 1860s and 1900. In the workshop, Koenig transformed acous- tics into a wide-ranging line of precision instruments in the mould of other fields represented in the Parisian precision trade; in his private laboratory, he pushed the technical boundaries of the field, shaped practice, and created a visual element for studying sound; in the commercial sphere he facilitated the transmission of specific kinds of teaching and research instruments throughout Europe and North America; in the social and material realms, his atelier served as a vibrant mediating space for diverse people, skills, instruments and materials. It was “chez Koenig” that many of the world’s influential scientists learned about developments in acoustics; in turn, it was “chez Koenig” that these same people influenced the products and scope of acoustical practice. Above all, Koenig’s atelier served as a platform for modifying, extending, spreading and challenging Helmholtz’s Sensations of Tone.
    [Show full text]