Preface |
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xi | |
Nomenclature |
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xv | |
1 Aircraft Noise Control |
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1 | (16) |
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1 | (6) |
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1.2 Active Noise Control and Active Structural Acoustic Control |
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7 | (5) |
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1.2.1 Active noise control applications in aircraft |
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9 | (3) |
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12 | (5) |
2 Fundamentals in Structural Acoustics |
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17 | (36) |
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17 | (2) |
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2.2 Metrics of Sound Transmission |
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19 | (4) |
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2.2.1 Sound pressure level |
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20 | (1) |
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2.2.2 Sound insertion loss |
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21 | (1) |
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2.2.3 Sound transmission loss |
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22 | (1) |
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2.3 Transmission Loss Experiments |
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23 | (2) |
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2.4 Experimental Modal Analysis |
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25 | (4) |
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2.4.1 Basics in structural dynamics |
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26 | (2) |
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2.4.2 Modal parameter estimation algorithms |
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28 | (1) |
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2.5 The Acoustic Wave Equation and the Helmholtz Equation |
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29 | (5) |
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2.5.1 The inhomogeneous wave equation |
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31 | (1) |
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2.5.2 The solution to the inhomogeneous wave equation |
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31 | (2) |
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2.5.3 Free space sound radiation |
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33 | (1) |
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2.5.4 The Kirchoff-Helmholtz integral equation |
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34 | (1) |
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2.6 Sound Radiation from Vibrating Flat Panels |
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34 | (10) |
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2.6.1 Sound power radiation |
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37 | (2) |
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2.6.2 Elemental radiators |
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39 | (2) |
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41 | (1) |
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2.6.4 Sound radiation efficiency |
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42 | (2) |
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2.7 Finite Element Method for Interior Problems |
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44 | (5) |
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2.8 Coupled FE Formulation for Interior Vibro-Acoustic Systems |
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49 | (2) |
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51 | (2) |
3 Transmission of Sound through Multiple Partitions |
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53 | (40) |
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53 | (2) |
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3.2 Analytical Modelling of Multi-Panel Partitions |
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55 | (14) |
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55 | (4) |
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3.2.2 Modal coupling theory |
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59 | (4) |
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3.2.3 Structure-acoustic modal coupling in triple-panel partitions |
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63 | (6) |
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3.3 Sound Transmission Through Infinite Triple Partitions |
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69 | (10) |
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3.3.1 Analysis of the derived equations |
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73 | (6) |
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3.4 Sound Transmission Simulation |
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79 | (12) |
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3.4.1 Diffuse acoustic excitation model |
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81 | (1) |
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82 | (9) |
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91 | (2) |
4 Adaptive Control of Sound Radiation |
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93 | (46) |
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93 | (4) |
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4.2 Control of Sound Radiation by Structural Actuators |
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97 | (4) |
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101 | (4) |
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4.3.1 Feedforward control |
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101 | (1) |
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102 | (2) |
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4.3.3 Feedforward vs. feedback control |
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104 | (1) |
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4.4 Steepest-Descent Algorithm |
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105 | (2) |
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4.5 Adaptive Digital Filters |
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107 | (3) |
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4.6 Filtered-X LMS Algorithm |
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110 | (1) |
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4.7 Multi-Channel Adaptive Algorithms |
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111 | (3) |
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4.8 Experimental System Identification |
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114 | (4) |
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4.9 Numerical Simulations |
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118 | (17) |
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4.9.1 Harmonic primary noise |
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122 | (3) |
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4.9.2 Random primary noise |
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125 | (5) |
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4.9.3 Narrow-band primary noise |
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130 | (5) |
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135 | (4) |
5 Noise-Reducing Smart Windows |
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139 | (50) |
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139 | (4) |
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143 | (8) |
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5.2.1 Control of sound transmission through multi-wall partitions: panel control |
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146 | (2) |
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5.2.2 Control of sound transmission through multi-wall partitions: cavity control |
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148 | (3) |
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151 | (5) |
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156 | (16) |
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158 | (2) |
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5.4.2 Numerical modelling |
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160 | (5) |
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5.4.3 Structural control actuators |
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165 | (7) |
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5.5 Smart Window Test-Bed |
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172 | (14) |
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5.5.1 Experimental modal analysis |
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174 | (3) |
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5.5.2 Control actuators set-up |
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177 | (9) |
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5.6 Transmission Loss Predictions |
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186 | (1) |
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187 | (2) |
6 Active Noise Control Experiments |
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189 | (56) |
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189 | (2) |
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191 | (4) |
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195 | (1) |
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6.4 Imperfections in the Experimental Set-Up |
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196 | (10) |
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6.4.1 Coupled vibro-acoustic model of the sending room |
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198 | (4) |
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6.4.2 Experimental validation |
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202 | (4) |
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6.5 Real-Time DSP Implementation of Active Noise Control |
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206 | (25) |
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6.5.1 The real-time controller |
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207 | (4) |
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6.5.2 Experimental results |
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211 | (20) |
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6.6 Sound Intensity Measurements |
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231 | (8) |
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6.6.1 Experimental results |
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233 | (6) |
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6.7 Passenger Comfort Estimation |
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239 | (4) |
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6.7.1 Subjective noise perception |
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239 | (2) |
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6.7.2 Virtual Passenger Model |
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241 | (2) |
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243 | (2) |
A Benchmark Examples |
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245 | (8) |
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245 | (1) |
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A.2 Laminar Piezoelectric Sensor |
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245 | (2) |
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A.3 Cantilever Piezoelectric Plate |
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247 | (6) |
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247 | (2) |
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249 | (4) |
B Sound Power Simulations |
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253 | (6) |
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253 | (2) |
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B.2 Radiation Efficiency of the Window Test-Bed |
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255 | (4) |
C Preliminary Experimental Studies |
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259 | (4) |
Bibliography |
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263 | (16) |
Index |
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279 | |