## Acoustics for Engineers: Troy Lectures (Google eBook)Blauert's and Xiang's 'Acoustics for Engineers' provides the material for an introductory course in engineering acoustics for students with basic knowledge in mathematics. In the second, enlarged edition, the teaching aspects of the book have been substantially improved. Carefully selected examples illustrate the application of acoustic principles and problems are provided for training.'Acoustics for Engineers' is designed for extensive teaching at the university level. Under the guidance of an academic teacher it is sufficient as the sole textbook for the subject. Each chapter deals with a well defined topic and represents the material for a two-hour lecture. The 15 chapters alternate between more theoretical and more application-oriented concepts. |

### What people are saying - Write a review

We haven't found any reviews in the usual places.

### Contents

1 | |

3 | |

4 | |

5 | |

6 | |

8 | |

17 DoubleLogarithmic Plots | 10 |

Mechanic and Acoustic Oscillations | 12 |

82 Conical Horns | 105 |

83 Exponential Horns | 107 |

84 Radiation Impedances and Sound Radiation | 110 |

85 Steps in the Area Function | 111 |

86 Stepped Ducts | 113 |

Spherical Sound Sources and Line Arrays | 116 |

91 Spherical Sound Sources of 0th Order | 118 |

92 Spherical Sound Sources of 1st Order | 122 |

21 Basic Elements of Linear Oscillating Mechanic Systems | 14 |

22 Parallel Mechanic Oscillators | 16 |

23 Free Oscillations of Parallel Mechanic Oscillators | 17 |

24 Forced Oscillation of Parallel Mechanic Oscillators | 19 |

25 Energies and Dissipation Losses | 22 |

26 Basic Elements of Linear Oscillating Acoustic Systems | 24 |

27 The Helmholtz Resonator | 25 |

Electromechanic and Electroacoustic Analogies | 27 |

31 The Electromechanic Analogies | 28 |

32 The Electroacoustic Analogy | 29 |

34 Rules for Deriving Analogous Electric Circuits | 31 |

35 Synopsis of Electric Analogies of Simple Oscillators | 33 |

37 Examples of Mechanic and Acoustic Oscillators | 34 |

Electromechanic and Electroacoustic Transduction | 36 |

41 Electromechanic Couplers as Two or ThreePort Elements | 38 |

42 The Carbon Microphone A Controlled Coupler | 39 |

43 Fundamental Equations of Electroacoustic Transducers | 40 |

44 Reversibility | 43 |

45 Coupling of Electroacoustic Transducers to the Sound Field | 44 |

46 Pressure and PressureGradient Receivers | 46 |

47 Further Directional Characteristics | 49 |

48 Absolute Calibration of Transducers | 52 |

MagneticField Transducers | 55 |

51 The Magnetodynamic Transduction Principle | 57 |

52 Magnetodynamic Sound Emitters and Receivers | 59 |

53 The Electromagnetic Transduction Principle | 65 |

54 Electromagnetic Sound Emitters and Receivers | 67 |

55 The Magnetostrictive Transduction Principle | 68 |

56 Magnetostrictive Sound Transmitters and Receivers | 69 |

ElectricField Transducers | 70 |

62 Piezoelectric Sound Emitters and Receivers | 74 |

63 The Electrostrictive Transduction Principle | 78 |

64 Electrostrictive Sound Emitters and Receivers | 79 |

65 The Dielectric Transduction Principle | 80 |

66 Dielectric Sound Emitters and Receivers | 81 |

67 Further Transducer and Coupler Principles | 85 |

The Wave Equation in Fluids | 87 |

71 Derivation of the OneDimensional Wave Equation | 89 |

72 ThreeDimensional Wave Equation in Cartesian Coordinates | 94 |

73 Solutions of the Wave Equation | 95 |

74 Field Impedance and Power Transport in Plane Waves | 96 |

75 TransmissionLine Equations and Reflectance | 97 |

76 The Acoustic Measuring Tube | 99 |

Horns and Stepped Ducts | 103 |

81 Websters Diﬀerential Equation the Horn Equation | 104 |

93 HigherOrder Spherical Sound Sources | 124 |

94 Line Arrays of Monopoles | 125 |

95 Analogy to Fourier Transforms as Used in Signal Theory | 127 |

96 Directional Equivalence of Sound Emitters and Receivers | 130 |

Piston Membranes Diffraction and Scattering | 133 |

101 The Rayleigh Integral | 134 |

102 Fraunhofers Approximation | 135 |

103 The Far Field of Piston Membranes | 136 |

104 The Near Field of Piston Membranes | 138 |

105 General Remarks on Diffraction and Scattering | 142 |

Dissipation Reflection Refraction and Absorption | 145 |

111 Dissipation During Sound Propagation in Air | 147 |

112 Sound Propagation in Porous Media | 148 |

113 Reflection and Refraction | 151 |

114 Wall Impedance and Degree of Absorption | 152 |

115 Porous Absorbers | 155 |

116 Resonance Absorbers | 158 |

Geometric Acoustics and Diffuse Sound Fields | 161 |

121 Mirror Sound Sources and Ray Tracing | 162 |

122 Flutter Echoes | 165 |

123 Impulse Responses of Rectangular Rooms | 167 |

124 Diffuse Sound Fields | 169 |

125 ReverberationTime Formulae | 172 |

126 Application of Diffuse Sound Fields | 173 |

Isolation of Air and StructureBorne Sound | 177 |

132 Radiation of Airborne Sound by Bending Waves | 179 |

133 SoundTransmission Loss of SingleLeaf Walls | 181 |

134 SoundTransmission Loss of DoubleLeaf Walls | 184 |

135 The Weighted SoundReduction Index | 186 |

136 Isolation of Vibrations | 189 |

137 Isolation of Floors with Regard to Impact Sounds | 192 |

Noise Control A Survey | 194 |

141 Origins of Noise | 196 |

143 Noise Reduction as a System Problem | 200 |

144 Noise Reduction at the Source | 203 |

145 Noise Reduction Along the Propagation Paths | 204 |

146 Noise Reduction at the Receivers End | 208 |

Appendices | 211 |

152 Complex Notation for Power and Intensity | 212 |

153 Supplementary Textbooks for Self Study | 214 |

154 Exercises | 215 |

155 Letter Symbols Notations and Units | 234 |

238 | |

### Common terms and phrases

0th-order absorbers acoustic air gap analogies baﬄe bending waves called coeﬃcient complex notation component constant couplers damping dashpot deﬁned deﬁnition density derived dielectric diﬀerent diﬀerential equation diﬀraction diﬀuse sound directional characteristics distance eﬀect electret electric ﬁeld electric networks electric-ﬁeld transducers Electroacoustic electromechanic electrostrictive elements Emitters and Receivers energy equivalent circuit example excitation ﬁrst ﬂoor ﬂow ﬂuid force function Helmholtz resonator illustrates impedance inﬁnitely insertion loss line array linear load losses loudspeaker Magnetostrictive mass material measured mechanic microphone noise oscillator particle displacement particle velocity phase piezoelectric Piston Membranes plane wave porous quantities radiation radiation impedance ratio reﬂection resonance schematically shown signals sinusoidal solution Sound Emitters sound ﬁeld sound incidence sound pressure sound propagation speciﬁc stiﬀness structure-borne sound transducer transmission tube vibration voltage volume velocity wall wave equation wavelength