Martinho, Claudia. 2019. Aural Architecture Practice: Creative Approaches for an Ecology of Affect
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Model-Based Processing for Underwater Acoustic Arrays
Books NEW Book from ASA Press ASA Press is a meritorious imprint of the Acoustical Society of America in collaboration with the major international publisher Springer Science + Business Media. All new books that are published with the ASA Press imprint will be announced in Acoustics Today. Individuals who have ideas for books should feel free to contact the ASA Publications Office to discuss their ideas. Model-Based Processing can be recursive either in space or time, depending on the for Underwater Acoustic application.This is done for three reasons. First, the Kalman Arrays filter provides a natural framework for the inclusion of phys- Author: Edmund J. Sullivan ical models in a processing scheme. Second, it allows poorly ISBN: 978-3-319-17556-0 known model parameters to be jointly estimated along with Pages: 113 pp., 25 illus., the quantities of interest. This is important, since in cer- 14 illus. in color tain areas of array processing already in use, such as those Available formats: based on matched-field processing, the so-called mismatch Softcover, $54.99, problem either degrades performance or, indeed, prevents eBook, MyCopy any solution at all. Thirdly, such a unification provides a for- Publication Date: 2015 mal means of quantifying the performance improvement. Publisher: Springer The term model-based will be strictly defined as the use of International Publishing physics-based models as a means of introducing a priori in- formation. This leads naturally to viewing the method as a Bayesian processor. Short expositions of estimation theory This monograph presents a unified approach to model- and acoustic array theory are presented, followed by a pre- based processing for underwater acoustic arrays. -
HP-2 Acoustic Design Guide
ACOUSTIC PRODUCT FAMILY Specifying Design Guide Our in-house, custom 7 STEPS TO SPECIFY Robust Examples including APPLICATION DRAWINGS Informative intro to the world of ACOUSTICS Table of Contents INTRODUCTION � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3 STEPS OVERVIEW � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4 MATERIAL TABLE � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5 REVERBERATION TIME TABLE � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6 PRODUCT TABLE � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8 EXAMPLE 1 � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9 EXAMPLE 2 � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �12 WORKSHEET � � � � � � � � � � � � � � � -
Response Variation of Chladni Patterns on Vibrating Elastic Plate Under Electro-Mechanical Oscillation
Nigerian Journal of Technology (NIJOTECH) Vol. 38, No. 3, July 2019, pp. 540 – 548 Copyright© Faculty of Engineering, University of Nigeria, Nsukka, Print ISSN: 0331-8443, Electronic ISSN: 2467-8821 www.nijotech.com http://dx.doi.org/10.4314/njt.v38i3.1 RESPONSE VARIATION OF CHLADNI PATTERNS ON VIBRATING ELASTIC PLATE UNDER ELECTRO-MECHANICAL OSCILLATION A. E. Ikpe1,*, A. E. Ndon2 and E. M. Etuk3 1, DEPT OF MECHANICAL ENGINEERING, UNIVERSITY OF BENIN, P.M.B. 1154, BENIN, EDO STATE, NIGERIA 2, DEPT OF CIVIL ENGINEERING, AKWA IBOM STATE UNIVERSITY, MKPAT ENIN, AKWA IBOM STATE, NIGERIA 3, DEPT OF PRODUCTION ENGINEERING, UNIVERSITY OF BENIN, P.M.B. 1154, BENIN, EDO STATE, NIGERIA E-mail addresses: 1 [email protected], 2 [email protected], 3 [email protected] ABSTRACT Fine grain particles such as sugar, sand, salt etc. form Chladni patterns on the surface of a thin plate subjected to acoustic excitation. This principle has found its relevance in many scientific and engineering applications where the displacement or response of components under the influence of vibration is vital. This study presents an alternative method of determining the modal shapes on vibrating plate in addition to other existing methods like the experimental method by Ernst Chladni. Three (3) finite element solvers namely: CATIA 2017 version, ANSYS R15.0 2017 version and HYPERMESH 2016 version were employed in the modelling process of the 0.40 mm x 0.40 mm plate and simulation of corresponding mode shapes (Chladni patterns) as well as the modal frequencies using Finite Element Method (FEM). Result of modal frequency obtained from the experimental analysis agreed with the FEM simulated, with HYPERMESH generated results being the closest to the experimental values. -
Basics of Acoustics Contents
BASICS OF ACOUSTICS CONTENTS 1. preface 03 2. room acoustics versus building acoustics 04 3. fundamentals of acoustics 05 3.1 Sound 05 3.2 Sound pressure 06 3.3 Sound pressure level and decibel scale 06 3.4 Sound pressure of several sources 07 3.5 Frequency 08 3.6 Frequency ranges relevant for room planning 09 3.7 Wavelengths of sound 09 3.8 Level values 10 4. room acoustic parameters 11 4.1 Reverberation time 11 4.2 Sound absorption 14 4.3 Sound absorption coefficient and reverberation time 16 4.4 Rating of sound absorption 16 5. index 18 2 1. PREFACE Noise or unwanted sounds is perceived as disturbing and annoying in many fields of life. This can be observed in private as well as in working environments. Several studies about room acoustic conditions and annoyance through noise show the relevance of good room acoustic conditions. Decreasing success in school class rooms or affecting efficiency at work is often related to inadequate room acoustic conditions. Research results from class room acoustics have been one of the reasons to revise German standard DIN 18041 on “Acoustic quality of small and medium-sized room” from 1968 and decrease suggested reverberation time values in class rooms with the new 2004 version of the standard. Furthermore the standard gave a detailed range for the frequency dependence of reverberation time and also extended the range of rooms to be considered in room acoustic design of a building. The acoustic quality of a room, better its acoustic adequacy for each usage, is determined by the sum of all equipment and materials in the rooms. -
Orbital Shaped Standing Waves Using Chladni Plates
doi.org/10.26434/chemrxiv.10255838.v1 Orbital Shaped Standing Waves Using Chladni Plates Eric Janusson, Johanne Penafiel, Andrew Macdonald, Shaun MacLean, Irina Paci, J Scott McIndoe Submitted date: 05/11/2019 • Posted date: 13/11/2019 Licence: CC BY-NC-ND 4.0 Citation information: Janusson, Eric; Penafiel, Johanne; Macdonald, Andrew; MacLean, Shaun; Paci, Irina; McIndoe, J Scott (2019): Orbital Shaped Standing Waves Using Chladni Plates. ChemRxiv. Preprint. https://doi.org/10.26434/chemrxiv.10255838.v1 Chemistry students are often introduced to the concept of atomic orbitals with a representation of a one-dimensional standing wave. The classic example is the harmonic frequencies which produce standing waves on a guitar string; a concept which is easily replicated in class with a length of rope. From here, students are typically exposed to a more realistic three-dimensional model, which can often be difficult to visualize. Extrapolation from a two-dimensional model, such as the vibrational modes of a drumhead, can be used to convey the standing wave concept to students more easily. We have opted to use Chladni plates which may be tuned to give a two-dimensional standing wave which serves as a cross-sectional representation of atomic orbitals. The demonstration, intended for first year chemistry students, facilitates the examination of nodal and anti-nodal regions of a Chladni figure which students can then connect to the concept of quantum mechanical parameters and their relationship to atomic orbital shape. File list (4) Chladni manuscript_20191030.docx (3.47 MiB) view on ChemRxiv download file SUPPORTING INFORMATION Materials and Setup Phot.. -
Wave Goodbye to Sound Waves
www.cymascope.com Wave Goodbye to Sound Waves Wave Goodbye to Sound Waves John Stuart Reid Sound is a wave, right? If you share this commonly held belief it is probably because everything you have ever read or been told about sound, whether from high school, popular science books or university courses has said so. And yet, if our eyes could see sound, we would not see waves wiggling their way through the air. Instead, we would see something quite surprising, as you will soon learn. So how did the popular belief in ‘sound waves’ begin? The confusion may have begun with German musician and physicist Ernst Chladni (1756-1827), sometimes described as ‘the father of acoustics.’ Chladni was inspired by the earlier work of English scientist Robert Hooke (1635–1703), who made contributions to many fields including mathematics, optics, mechanics, architecture and astronomy. In 1680 Hooke devised an apparatus consisting of a glass plate covered with flour that he ‘played’ with a violin bow. He was fascinated by the resulting patterns. Around 1800 this phenomenon Ernst Chladni was further explored by Ernst Robert Hooke Chladni, who used a brass plate and sand. Brass is a highly resonant metal and the bell-like sounds he created resulted in the sand grains organizing themselves into complex geometric patterns. These archetypal patterns are now referred to as ‘Chladni Figures,’ although the originator of the invention was actually Hooke. Chladni demonstrated this seemingly magical phenomenon all over Europe and he even had an audience with Napoleon. The French leader was so impressed that he sponsored a competition with The French Academy of Sciences in order to acquire an explanation as to the mechanism behind the sand patterns. -
Reverberation and the Art of Architectural Acoustics
Sabine and reverberation 11/29/02 11:21 AM Reverberation and the Art of Architectural Acoustics © 2002 Robert Sekuler (revised) In 1895 Harvard University, that other school situated on the Charles River, opened its Fogg Art Museum. This wonderful building, still much used today, contained an equally wonderful, large lecture hall. Audiences flocked in, eager to experience intellectual enlightenment in beautiful new surroundings. But there was a large, ugly fly in this intellectual ointment: No one could understand any of the lectures that were given in Fogg lecture hall. And it wasn't because the lectures were too esoteric, or because the lecturers mumbled into their beards, or because the students were too distracted. The problem was acoustics and hearing. For help, Harvard turned to one of its own, Wallace Clement Sabine (photo), then a 27 year-old Assistant Professor of Physics. To that point in his career, Sabine had distinguished himself primarily through his teaching; research productivity was not his strongest suit. Even though Sabine had not previously worked with this sort of problem, his writings show that he was a remarkably quick study and a truly dedicated scientist. His published work also provides a model of good, clear scientific prose. After diagnosing and then solving Harvard's problem with the Fogg lecture room, Sabine devoted the rest of his career to the new field that he had virtually created in the process: architectural acoustics. First, Sabine noted that when anyone spoke in the Fogg Museum lecture room, even at normal conversational levels, the sound of his or her voice remained audible in the room for several seconds thereafter. -
CHLADNI PATTERNS by Tom and Joseph Irvine
CHLADNI PATTERNS By Tom and Joseph Irvine September 18, 2000 Email: [email protected] ______________________________________________________________________ HISTORICAL BACKGROUND Ernst Chladni (1756-1827) was a German physicist who performed experimental studies of vibrating plates. Specifically, he spread fine sand over metal or glass plates. He then excited the fundamental natural frequency of the plate by stroking a violin bow across one of its edges. As a result, a standing wave formed in the plate. A standing wave has "anti-nodes" where the maximum displacement occurs. A standing wave also has "nodes" where no displacement occurs. For a vibrating plate, the nodes occur along "nodal lines." In Chladni's experiment, the sand grains responded to the excitation by migrating to the nodal lines of the plates. The grains thus traced the nodal line pattern. Sophie Germain (1776-1831) derived mathematical equations to describe Chladni's experiments. She published these equations in Memoir on the Vibrations of Elastic Plates. Jules Lissajous (1822-1880) performed further vibration research using Chladni's test methods. THEORY Elastic plates have numerous natural frequencies. The lowest natural frequency is called the fundamental natural frequency. The fundamental frequency is usually the dominant frequency. Each natural frequency has a corresponding "mode." The mode is defined in terms of its nodal line pattern. Each mode has a unique pattern. Points on opposite sides of a nodal line vibrate "180 degrees out-of-phase." Stroking a plate with a violin bow may excite several natural frequencies, thus complicating the experiment. Again, the response will usually be dominated by the fundamental mode. 1 The higher modes can be individually excited, to some extent, by stroking the plate at different edge locations. -
Room Acoustics Education in Interior Architecture Programs: a Course Structure Proposal
Room acoustics education in interior architecture programs: A course structure proposal Kitapci, Kivanc1 Çankaya University Mimarlık Fakültesi, İç Mimarlık Bölümü. Çukurambar Mah. Öğretmenler Cad. No: 14, 06530 Çankaya, Ankara, Türkiye ABSTRACT Soundscape research alters the notion of room acoustics from a physical phenomenon to a new multidisciplinary approach that concerns human perception of the acoustic environment, in addition to the physical calculations and measurements. Many interior architecture programs include courses that specifically focus on room acoustics. Although a brief introduction to the technical aspects of room acoustics is considered mandatory, the current course structure does not deliver sufficient information on the human perception of the acoustic environment. Therefore, the aim of the study is to reconsider the structure of room acoustic courses and present a brand- new room acoustics course structure proposal for the interior architecture programs. The study consists of two main phases. In the first phase, a database of all courses that include various topics on room acoustics is prepared through examination of the course descriptions of all undergraduate and graduate interior architecture programs in Turkey. In the second phase, the revisions to the current state of the room acoustics course structures are advised through an in-depth systematic literature review on the research area of soundscapes. Preliminary results and the initial course structure model will be presented at the conference. Keywords: Acoustic education, Soundscape, Interior architecture I-INCE Classification of Subject Number: 07 1. INTRODUCTION Since the beginning of the 20th century, vision-centred approaches dominate the higher-education curriculums of design disciplines such as architecture, interior architecture, industrial design, and city and regional planning. -
Principles of Acoustics - Andres Porta Contreras, Catalina E
FUNDAMENTALS OF PHYSICS – Vol. I - Principles Of Acoustics - Andres Porta Contreras, Catalina E. Stern Forgach PRINCIPLES OF ACOUSTICS Andrés Porta Contreras Department of Physics, Universidad Nacional Autónoma de México, México Catalina E. Stern Forgach Department of Physics, Universidad Nacional Autónoma de México, México Keywords: Acoustics, Ear, Diffraction, Doppler effect, Music, Sound, Standing Waves, Ultrasound, Vibration, Waves. Contents 1. Introduction 2. History 3. Basic Concepts 3.1. What is Sound? 3.2. Characteristics of a Wave 3.3. Qualities of Sound 3.3.1. Loudness 3.3.2. Pitch 3.3.3. Timbre 3.4. Mathematical Description of a Pure Sound Wave 3.5. Doppler Effect 3.6. Reflection and Refraction 3.7. Superposition and Interference 3.8. Standing Waves 3.9. Timbre, Modes and Harmonics 3.10. Diffraction 4. Physiological and Psychological Effects of Sound 4.1. Anatomy and Physiology of Hearing. 4.1.1. Outer Ear 4.1.2. Middle Ear 4.1.3. Inner Ear 5. ApplicationsUNESCO – EOLSS 5.1. Ultrasound 5.2. Medicine 5.3. Noise Control 5.4. MeteorologySAMPLE and Seismology CHAPTERS 5.5. Harmonic Synthesis 5.6. Acoustical Architecture and Special Building Rooms Design 5.7. Speech and Voice 5.8. Recording and Reproduction 5.9. Other Glossary Bibliography Biographical Sketches ©Encyclopedia of Life Support Systems (EOLSS) FUNDAMENTALS OF PHYSICS – Vol. I - Principles Of Acoustics - Andres Porta Contreras, Catalina E. Stern Forgach Summary The chapter begins with a brief history of acoustics from Pythagoras to the present times. Then the main physical and mathematical principles on acoustics are reviewed. A general description of waves is given first, then the characteristics of sound and some of the most common phenomena related to acoustics like echo, diffraction and the Doppler effect are discussed. -
Acoustics 101 for Architects a Presentation of Acoustical Terminology and Concepts Relating Directly to the Design and Construction of an Architectural Space
Acoustics 101 for Architects A presentation of acoustical terminology and concepts relating directly to the design and construction of an architectural space. Low-tech descriptions, explanations, and examples. By: Michael Fay This essay is tailored to the one group of people who have more influence over a building's acoustics than any other; architects. The focus is on Architectural Acoustics, a field that is broader than most imagine. To do justice to the theme, we must briefly touch on many subordinate topics, most having a synergetic relationship bonding architecture and sound. This paper is based on fundamentals, not perfection. It covers most of the basics, and explores many modern and esoteric matters as well. You will be introduced to interesting and analytical subjects; some you may know, some you may never have considered. Here are a few examples of what you'll find by reading on: . What is sound and why is it so hard to manage or control? . The length of low- and high-frequency sound waves vary by as much as 400:1. Why does this disparity matter? . How and why do various audible frequencies behave differently when interacting with various materials, structures, shapes and finishes? . There are three acoustical tools available to both the architect and the acoustician. What are they? How can they benefit or hinder the work of each craft? . Room geometry: Why some shapes are much better than others. Examples and explanations. Reverberation and echo: How do they differ? Which is better, or worse, and why? How much is too much, or too little? . -
Historical Introduction
HISTORICAL INTRODUCTION The arts of music, drama, and public discourse have both influenced and been influenced by the acoustics and architecture of their presentation environments. It is theorized that African music and dance evolved a highly complex rhythmic character due, in part, to its being performed outdoors-rather than the melodic line of early European music. Wallace Clement Sabine (1868–1919), an early pioneer in architectural acoustics, felt that the development of a tonal scale in Europe rather than in Africa could be ascribed to the differences in living environment. In Europe, prehistoric tribes sought shelter in caves and later constructed increasingly large and reverberant temples and churches. Gregorian chant grew out of the acoustical characteristics of the gothic cathedrals, and subsequently Baroque music was written to accommodate the churches of the time. In the latter half of the twentieth century both theater design and performing arts became technology driven, particularly with the invention of the electronic systems that made the film and television industries possible. With the development of computer programs capable of creating the look and sound of any environment, a work of art can now not only influence, but also define the space it occupies. 1.1 GREEK AND ROMAN PERIOD (650 bc - AD 400) Early Cultures The origin of music, beginning with some primeval song around an ancient campfire, is impossible to date. There is evidence (Sandars, 1968) to suggest that instruments existed as early as 13,000 bc. The understanding of music and consonance dates back at least to 3000 bc, when the Chinese philosopher Fohi wrote two monographs on the subject (Skudrzyk, 1954).