Noise-Controlling Casings

279 Pages·2022·41.756 MB·English

by  Marek Pawelczyk, Stanislaw Wrona

Noise-Controlling
Casings
Due to technological development, noise and vibration are ubiquitous in the hu-
man environment and belong to the most significant threats to man’s wellbeing.
Noise-Controlling Casings offers a range of feasible noise-controlling strate-
gies for different kinds of devices generating excessive noise. Depending on the
required performance and the availability of energy sources, three solution cat-
egories are presented: passive (no external energy is needed, but performance is
limited), semi-active (little energy is needed, but performance achieves higher
values) and active (best performance, but an external energy source is needed).
Two very important benefits of these proposed solutions are global noise reduc-
tion (in an entire enclosure or the surrounding space) and compact technology
(contrary to other active noise control solutions requiring a large number of sec-
ondary sources and distributed sensors). Many of the solutions presented are
original approaches by the authors, their own developed concepts and new ele-
ments and designs that have gained recognition in prestigious journals. The book
provides a theoretical background to the research, looking at system configura-
tions, mathematical modelling, signal processing implementation and numerical
analysis.
The proposed ideas can be applied to any devices provided they have casings of
thin walls or they can be enclosed by casings of thin walls. Applications include
industrial devices, household appliances, vehicle or aircraft cabins and more.
This book will be of interest to professionals and students in the fields of acous-
tics, vibration, signal processing, control, automotive and aircraft engineering.
Taylor & Francis
Taylor & Francis Group
http://taylorandfrancis.com
Noise-Controlling
Casings

Edited by
Marek Pawelczyk
Stanislaw Wrona
First edition published 2023
by CRC Press
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and by CRC Press
4 Park Square, Milton Park, Abingdon, Oxon, OX14 4RN
CRC Press is an imprint of Taylor & Francis Group, LLC
© 2023 selection and editorial matter, Marek Pawelczyk and Stanislaw Wrona; individual
chapters, the contributors
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ISBN: 9781032226972 (hbk)
ISBN: 9781032227023 (pbk)
ISBN: 9781003273806 (ebk)
DOI: 10.1201/9781003273806
Typeset in NimbusRomNo9L-Regu font
by KnowledgeWorks Global Ltd.
Publisher’s note: This book has been prepared from camera-ready copy provided by the
authors.
Dedication
Toourfamiliesandsupporters
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Taylor & Francis Group
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Contents
Preface.......................................................................................................................xi
Contributors............................................................................................................xiii
Chapter1 Introduction.....................................................................................1
1.1 Noiseinthemodernworld.....................................................1
1.2 Noisereductionmethods........................................................1
1.3 Noise-controllingcasing.........................................................3
1.4 Objectivesandscopeofthebook...........................................3
Chapter2 Consideredtypesofcasings............................................................7
2.1 Introduction.............................................................................7
2.2 Rigidcasing............................................................................7
2.2.1 Actuatorsandsensors ...............................................8
2.2.2 Secondarypathsanalysis ........................................12
2.3 Lightweightcasing................................................................12
2.3.1 Actuatorsandsensors..............................................12
2.3.2 Frequencyresponsefunctions .................................14
2.3.3 Secondarypathsanalysis ........................................15
2.4 Realcasing............................................................................17
2.5 Summary...............................................................................18
Chapter3 Modellingofcasings.....................................................................21
3.1 Introduction...........................................................................21
3.2 Analyticalmodellingofindividualcasingwalls..................25
3.2.1 Kirchhoff-Loveplatetheory....................................26
3.2.2 Mindlin-Reissnerplatetheory..................................28
3.3 Analyticalmodellingofthewholecasing............................45
3.3.1 Single-panelrigidcasing..........................................46
3.3.2 Double-panelrigidcasing........................................52
3.3.3 Lightweightcasing...................................................66
3.4 Numericalmodelling............................................................77
3.4.1 Numericalsimulationsofasingleplate...................78
3.4.2 Numericalsimulationsofanactivecasing..............84
3.5 Validationofselectedmodels...............................................95
3.5.1 Rigidcasingwalls....................................................95
3.5.2 Lightweightcasingwalls ........................................97
vii
viii Contents
3.6 Summary.............................................................................104
Chapter4 Passivecontrol.............................................................................105
4.1 Introduction.........................................................................105
4.2 Shapingofstructuralandacousticresponses.....................105
4.2.1 Optimizationalgorithm..........................................106
4.2.2 Objectivefunctions................................................108
4.2.3 Results....................................................................109
4.3 Passiveshuntsystems.........................................................116
4.3.1 Hardwareplatform.................................................116
4.3.2 Controlstructure....................................................118
4.3.3 Controlresults........................................................124
4.4 Compositestructures..........................................................126
4.4.1 Functionallygradedmaterials................................130
4.4.2 Hybridcomposites.................................................132
4.5 Summary.............................................................................135
Chapter5 Semi-activecontrol......................................................................137
5.1 Introduction.........................................................................137
5.2 Switchedmechanicallinksfordoublepanels.....................137
5.2.1 Hardwareplatform.................................................138
5.2.2 Controlalgorithm...................................................140
5.2.3 Controlresults........................................................142
5.3 Coil-basedlinksfordoublepanels.....................................146
5.3.1 Hardwareplatform.................................................147
5.3.2 Controlalgorithm...................................................150
5.3.3 Controlresults........................................................152
5.4 Massmomentofinertiaactuator........................................161
5.4.1 Hardwareplatform.................................................162
5.4.2 Controlalgorithm...................................................163
5.4.3 Controlresults........................................................164
5.5 Semi-activeshuntsystems..................................................171
5.5.1 Hardwareplatform.................................................171
5.5.2 Controlalgorithm...................................................174
5.5.3 Controlresults........................................................177
5.6 Summary.............................................................................178
Chapter6 Activecontrolsystems.................................................................179
6.1 Introduction.........................................................................179
6.2 Hardwareplatform..............................................................179
6.2.1 Optimizationofactuatorsarrangement..................179
6.2.2 Optimizationoferrormicrophones........................187
6.2.3 Controlunit............................................................192
Contents ix
6.3 Controlstructures................................................................194
6.3.1 Feedforwardcontrol...............................................194
6.3.2 Acousticfeedback..................................................200
6.3.3 Feedbackcontrol....................................................202
6.3.4 Virtualmicrophonecontrol....................................204
6.4 Adaptivecontrolalgorithms...............................................210
6.4.1 TheLeastMeanSquarealgorithm.........................210
6.4.2 StabilityoftheLMS-familyalgorithms.................214
6.4.3 Fastimplementations.............................................216
6.4.4 Multichannelimplementations...............................226
6.5 Summary.............................................................................242
Chapter7 Summary......................................................................................245
AppendixA Stiffnessmatrixelements.............................................................247
AppendixB Massmatrixelements..................................................................251
References.............................................................................................................253
Index......................................................................................................................263