Paul sabine acoustics and architecture ppt

03 OU 158930 >m [...]... branch of the much larger study of the mechanics of solids and fluids 1 ACOUSTICS AND ARCHITECTURE 2 Branches of Acoustics On the physical side, acoustics naturally divides itself into three parts: (1) the study of vibrating bodies including solids and partially inclosed fluids; (2) the propagation of vibratory energy through elastic fluids; and (3) the study mechanism of the organ of perception bj;... recommended that all : auditoriums be Sanders Theater is by far the best auditorium elliptical Cambridge and is semicircular in general shape but with a recess that makes it almost anything; and, on the other hand, the lecture room in the Fogg Art Museum is also semicircular, indeed was modeled But Sanders Theater after Sanders Theater, and it was the worst is in wood and the Fogg lecture room is plaster... experimentally the con" ditions of "no reflection" and a homogeneous medium." Out of doors, reflection from the ground disturbs the ideal this Elasticity is a measure of the ability of a substance to resist compression In this sense, solids and liquids are more elastic because less compressible than gases ACOUSTICS AND ARCHITECTURE 8 condition, and moving air currents and temperature variations nullify our assumption... DESIGN 171 CHAPTER X MEASUREMENT AND CONTROL OF NOISE IN BUILDINGS CHAPTER XI THEORY AND MEASUREMENT OF SOUND TRANSMISSION CHAPTER 204 232 XII TRANSMISSION OF SOUND BY WALLS CHAPTER 253 XIII MACHINE ISOLATION 282 APPENDICES 307 323 INDEX ix ACOUSTICS AND ARCHITECTURE CHAPTER I INTRODUCTION Historical Next to mechanics, acoustics is the oldest branch of physics light, and electricity have in the course... condition of architectural acoustics the science of sound as applied to buildings who has not with a pressing case in hand sought through the scattered literature for some safe guidance Responsibility in a large and irretrievable expenditure of careful consideration and emphasizes the meagerness money compels a and inconsistency of the current suggestions Thus the most definite and often-repeated statements... pressure and contraction of gases It is easy to show that under the isothermal condition, the elasticity of a gas at any pressure is numerically equal to that pressure; so that Newton's law for the velocity c of propagation of sound in air becomes /pressure > density _ JP p > The pressure and density must of course be expressed in absolute units The density of air at C and a pressure ACOUSTICS AND ARCHITECTURE. .. vibrating parterms of the time, measured from the instant the particle passed through its undisplaced position, and of the Equation ticle in ACOUSTICS AND ARCHITECTURE 18 amplitude and frequency of vibration The equation of a wave gives the displacement of any particle in terms of the time and the coordinates that determine the undisplaced position of the particle In the case of a plane wave, since... physiological and psychological aspects of the subject as well as the study of sound in its relation to music and speech Of the three divisions of purely physical acoustics, the induce nerve stimuli acoustics, study of the laws of vibrating bodies has, up until the last twenty-five years, received by far the greatest attention of The problems of vibrating strings, of thin physicists of plates, and of air... disturbance This type of motion is called a compressioiial wave, and, as appears, such a wave consists of alternate condensations and rarefactions medium This is the only kind of wave that can be propagated through a gas In solids, the particle motion may be at right angles to the direction of travel, and the of the wave would spoken and troughs and As a matter of fact, consist of alternate crests of as... communication and of the recording and reproduction of sound These have led to a demand for increased knowledge of the principles underlying the control of sound, a demand which has been augmented by the necessity of minimizing the noise resulting from the ever increasing mechanization of all our activities Thus it happens that acoustical problems have come to claim the attention of a large group of engineers and . h0" alt=""