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STRUCTURE
Application-orienteddesignofactivenoisecontrolsystems
Themonographisorganisedasfollows.
Chapter1constitutesanintroduction.Atthebeginningtheproblemof
acousticnoiseandnecessityofitsreductionareaddressed.Then,activenoise
controlandactivestructuralacousticcontrolapproachesarebrieflypresented.The
activityonactivecontrolinPolandandabroadisbrieflysummarised.
Chapter2concernsactivenoisecontrolinlargeindustrialhalls.Necessityof
localcontrolintheformofzonesofquietisjustified.Differentsolutionsfor
enlargingandspatiallyequalizingthezonesarepresented.Amongthem,special
attentionispaidtoapplicationoftheideaofvirtualmicrophones.Itallowsfor
achievingthegoalwithonlylittleinterferencewiththeenvironment.Then,the
problemofefficientandreliableimplementationofthelarge-scalemulti-channel
systemisaddressed.Reductionoftransientacousticeffectsisalsoconsidered.
InChapter3theproblemofmachineryanddevicenoiseistackledwith.The
ideaofactivedevicecasingisputforward.Bothrigidandflexiblewallcasingsare
considered.Thechapterstartswiththeproblemofactuatorsandsensorslocations.
Then,anumberofissuesrelatedtocontrolofsoundradiatingplatesarediscussed.
Solutionsforequalizingfrequencyresponse,compensationfornon-linearityand
temperatureinfluence,andcontrolofacousticpressurewithuseofvibration
sensingarepresented.Activecontrolofdouble-panelwallstoenhancesystem
efficiency,andsemi-activecontrolwithshuntcircuitstoreduceenergy
consumptionandmodifyresponseoftheplatesarealsoaddressed.
Chapter4isdevotedtonoisereductioninlarge-scaleheating,ventilation
andairconditioningsystems.Smallinstallationsandofsmalldiametersbelongto
theclassicsoftheactivenoisecontrolliterature.However,largesystemsinvolve
differentapproach.Amulti-moduleconfigurationwithoneprimaryandmany
secondaryactivecontrolunitsisproposed.Theproblemsofacousticnoisecontrol
