Verfügbarkeit: Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach

Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach:

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Bibliographische Detailangaben
Beteilige Person:	Bokhari, Syed Fawad Raza Ali (VerfasserIn)
Format:	Hochschulschrift/Dissertation Buch
Sprache:	Englisch
Veröffentlicht:	Aachen Shaker Verlag 2018
Schriftenreihe:	Schriftenreihe des Instituts für Modellierung und Berechnung 2018,27
Schlagwörter:	Strömungsakustik Klimaanlage Flugzeugkabine Nichtlineares mathematisches Modell Luftströmung Geräuschanalyse Aeroacoustics Artificial Neural Networks Emipirical modelling Flow noise Neuro Fuzzy Hochschulschrift
Links:	http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=030379742&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
Umfang:	xii, 182 Seiten Illustrationen, Diagramme 21 cm x 14.8 cm, 300 g
ISBN:	9783844058468 384405846X

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Datensatz im Suchindex

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adam_text	CONTENTS N OM ENCLATURE..................................................................................................................... V 1 INTRODUCTION 1 1.1 MOTIVATION .............................................................................................................. 1 1.2 THESIS OBJECTIVE........................................................................................................ 3 1.3 THESIS APPROACH ..................................................................................................... 4 1.4 LITERATURE SURVEY AND STATE-OF-THE-ART ............................................................... 5 1.4.1 DIMENSIONAL ANALYSIS AND DESIGN OF EXPERIMENTS ................................ 5 1.4.2 STATISTICAL HYPOTHESIS TESTING AND EXPLORATORY DATA A N A LY SE S .............. 6 1.4.3 MODEL IDENTIFICATION AND PARAMETER O P TIM IZ A TIO N ................................ 7 1.4.4 STATISTICAL PERFORMANCE OF A M O D E L ......................................................... 8 1.5 OVERVIEW ................................................................................................................. 9 2 FLOW NOISE MODELLING, ISSUES AND AN ALTERNATIVE 11 2.1 FLUID FLOW AND FLOW NOISE ..................................................................................... 11 2.1.1 FLUID FLO W ............................................... 12 2.1.2 FLOW NOISE..................................................................................................... 13 2.2 TRADITIONAL MODELLING TECHNIQUES FOR FLOW AND FLOW NOISE P RE D IC TIO N ................. 14 2.2.1 FLUID FLO W ..................................................................................................... 14 2.2.2 FLOW NOISE..................................................................................................... 16 2.3 ISSUES WITH RESPECT TO THE MODELLING TEC H N IQ U E S ............................................... 18 2.3.1 GENERAL ISSUES .............................................................................................. 18 2.3.2 COMPUTATIONAL ISSUES .................................. 19 2.4 EMPIRICAL MODELLING OF THE FLOW NOISE ...................................................................20 2.4.1 PRE-EXPERIMENTAL INVESTIGATION P H A S E ..........................................................22 2.4.2 PRE-MODELLING P H A S E ......................................................................................22 2.4.3 MODELLING P H A S E ............................................................................................ 23 2.4.4 POST-MODELLING P H A SE ......................................................................................24 2.5 CHAPTER CONCLUSION......................................................................................................24 3 PRE-EXPERIMENTAL INVESTIGATION PHASE 27 3.1 THE MATRIX METHOD: A DIMENSIONAL ANALYSIS A P P RO A C H .......................................27 3.2 POWER NUMBER BASED DIMENSIONLESS QUANTITY ...................................................... 28 3.3 DIMENSIONLESS OPERATING P O I N T S ............................................................................... 32 3.4 DIMENSIONAL ANALYSIS FOR DIFFERENT COM PONENTS..........................................................33 3.4.1 SINGLE-HOLE ORIFICE ......................................................................................... 33 3.4.2 BRANCHED D U C T ................................................................................................35 3.4.3 A IR-O U TLE T.........................................................................................................37 3.5 FLOW NOISE EXPERIMENTAL ENVIRONM ENT........................................................................38 3.6 DESIGN OF E X P E RIM E N TS ............................................................................................... 42 3.7 CHAPTER CONCLUSION......................................................................................................45 4 MODELLING, AND PRE- AND POST-MODELLING PHASES 47 4.1 PRE-MODELLING P H A S E ...................................................................................................47 4.1.1 STATISTICAL HYPOTHESIS T E S T I N G ...................................................................... 47 4.1.2 EXPLORATORY DATA A N ALY SES.............................................................................49 4.1.3 PROCESS CAPABILITY ANALYSIS ......................................................................... 51 4.1.4 INPUT SENSITIVITY A N A LY S E S .............................................................................53 4.1.4.1 ANALYSIS OF V A RIA N C E ....................................................................... 53 4.1.4.2 CORRELATION A N A LY S IS ....................................................................... 54 4.1.5 REPRODUCIBILITY AND REP EATAB ILITY ................................................................57 4.2 MODELLING PHASE . .........................................................................................................58 4.2.1 SUBJECTIVE AND SYSTEMATIC SELECTION OF THE MODEL STRUCTURE .................. 59 4.2.2 NEURO-FUZZY BASED SELECTION OF THE MODEL S TR U C TU R E ................................ 60 4.2.2.1 ARTIFICIAL NEURAL NETWORKS ...........................................................61 4.2.2.2 FUZZY SYSTEM, RBF NETWORK AND NEURO-FUZZY SYSTEM .... 63 4.2.2.3 NEURO-FUZZY BASED LOCAL MODEL NETWORKS . ................................... 64 4.2.2.4 CRITERIA OF MAXIMUM ACCEPTABLE ERROR AND MAXIMUM ITERATIONS 68 4.2.2.5 LMN BASED MODEL FOR THE SINGLE-HOLE ORIFICE .............................. 68 4.3 POST-MODELLING P H A SE ............................................................................................... 70 4.3.1 STATISTICAL PERFORMANCE OF A M O D E L .............................................................70 4.3.1.1 RESIDUAL A N A L Y S E S ...........................................................................71 4.3.1.2 TAYLORS DIAGRAM ....................................................................... 73 4.3.2 CONTROL CHARTS ............................................................................................ 73 4.3.3 ANOVA AND CORRELATION A N ALY SE S................................................................ 74 4.4 SUMMARY OF THE FRAMEWORK FOR AN EMPIRICAL M O D ELLIN G .........................................75 4.5 CHAPTER CONCLUSION.................................................................................................. 78 5 EMPIRICAL MODELLING FOR DIFFERENT COMPONENTS OF THE AIR DISTRIBUTION SYSTEM 81 5.1 SUBJECTIVE M ODELLING...................................................................................................81 5.2 SINGLE-HOLE ORIFICE ......................................................................................................82 5.2.1 PRE-MODELLING P H A S E ...................................................................................... 82 5.2.2 MODELLING P H A S E ......................... 82 5.2.2.1 EFFECT OF THE HELMHOLTZ NUMBER ................................ 82 5.2.2.2 EFFECT OF THE DIAMETER R A T I O ..........................................................83 5.2.2.3 EFFECT OF THE REYNOLDS N U M B E R .................................................... 84 5.2.2.4 FINALISING THE MODEL STRUCTURE AND ESTIMATING THE UNKNOWN P A RA M E TE RS......................................................................................85 5.2.3 POST-MODELLING P H ASE ............... 89 5.2.3.1 RESIDUAL ANALYSES AND TAYLORS D IA G RA M .....................................89 5.2.3.2 PREDICTING THE POWER NUMBER BASED ACOUSTIC QUANTITY . . . 89 5.2.3.3 PREDICTING THE SOUND POWER LE V E L ................................................. 90 5.2.3.4 ANOVA AND CORRELATION ANALYSES................................................90 5.3 BRANCHED DUCT ............................................................................................................92 5.3.1 PRE-MODELLING PHASE FOR THE MAIN BRANCH ................................................ 92 5.3.2 MODELLING PHASE FOR THE MAIN B RA N C H ......................................................... 95 5.3.2.1 EFFECT OF THE HELMHOLTZ NUMBER ................................................. 97 5.3.2.2 EFFECT OF THE REYNOLDS N U M B E R .................................................... 99 5.3.2 3 EFFECT OF THE VOLUME FLOW R A T I O ...................................................100 5.3.2.4 EFFECT OF THE BRANCH ANGLE .........................................................100 5.3.2.5 FINALISING THE MODEL STRUCTURE AND ESTIMATING THE UNKNOWN P A RA M E TE RS.................................................................................... 101 5.3.3 POST-MODELLING PHASE FOR THE MAIN B RA N C H .............................................. 105 5.3.3.1 RESIDUAL ANALYSES AND TAYLORS D IA G RA M ...................................105 5.3.3.2 PREDICTING THE POWER NUMBER BASED ACOUSTIC QUANTITY AND SOUND POWER L E V E L ....................................................................... 107 5.3.3.3 ANOVA AND CORRELATION ANALYSES ............................................... 108 5.3.4 PRE-MODELLING PHASE FOR THE SIDE B R A N C H ................................................. 109 5.3.5 MODELLING PHASE FOR THE SIDE B R A N C H ............................ 110 5.3.6 POST-MODELLING PHASE FOR THE SIDE B RANCH .................. 118 5.3.6.1 RESIDUAL ANALYSES AND TAYLORS D IA G RA M ...................................118 5.3.6.2 PREDICTING THE POWER NUMBER BASED ACOUSTIC QUANTITY AND THE SOUND POWER L E V E L ................................................................. 121 5.3.6.3 ANOVA AND CORRELATION ANALYSES ............................................... 121 5.4 A IR-O U TLE T....................................................................................................................122 5.4.1 PRE-MODELLING P H A S E ............................................... 122 5.4.2 MODELLING P H A S E .......................................................................................... 125 5.4.3 POST-MODELLING P H ASE.................................................................................... 131 5.4.3.1 RESIDUAL ANALYSES AND TAYLOR*S D IA G RA M ...................................131 5.4.3.2 PREDICTING THE POWER NUMBER BASED ACOUSTIC QUANTITY AND THE SOUND POWER L E V E L ................................................................. 132 5.4.3 3 ANOVA AND CORRELATION ANALYSES ............................................ 133 5.5 CHAPTER CONCLUSION....................................................................................................134 6 RESULTS: PREDICTION FOR CLUSTERS OF COMPONENTS 135 6.1 CLUSTER 1: SINGLE-HOLE ORIFICE AND AIR-OUTLET..........................................................135 III 6.2 CLUSTER 2: SINGLE-HOLE ORIFICE AND BRANCHED D U C T ................................................. 135 6.3 CLUSTER 3: SINGLE-HOLE ORIFICE, BRANCHED DUCT AND A IR-O U TLET ............................ 136 6.4 A REPRESENTATIVE SIMULATION OF AIR DISTRIBUTION SYSTEM ...................................137 6.5 CHAPTER CONCLUSION.................................................................................................... 139 7 CONCLUSIONS AND OUTLOOK 157 A STATISTICAL METHODS 161 A.L SUMMARY OF DIFFERENT EDA TE C H N IQ U E S...................................................................161 A.2 A N O V A .......................................................................................................................162 A.3 BOX PLOT ....................................................................................................................163 A.4 CORRELATION ANALYSIS .................................................................................................163 A.5 BIAS AND VARIANCE E R R O R ...........................................................................................165 B GRADIENT BASED PARAMETER OPTIMIZATION 167 C AIR DISTRIBUTION IN AN AIRCRAFT 169 BIBLIOGRAPHY 171
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spellingShingle	Bokhari, Syed Fawad Raza Ali Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach Schriftenreihe des Instituts für Modellierung und Berechnung Strömungsakustik (DE-588)4116645-0 gnd Klimaanlage (DE-588)4120572-8 gnd Flugzeugkabine (DE-588)4154784-6 gnd Nichtlineares mathematisches Modell (DE-588)4127859-8 gnd Luftströmung (DE-588)4338131-5 gnd Geräuschanalyse (DE-588)4324422-1 gnd
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title	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach
title_auth	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach
title_exact_search	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach
title_full	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach Syed Fawad Raza Ali Bokhari
title_fullStr	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach Syed Fawad Raza Ali Bokhari
title_full_unstemmed	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach Syed Fawad Raza Ali Bokhari
title_short	Modelling of flow noise inside an aircraft air distribution system: A non-linear empirical modelling approach
title_sort	modelling of flow noise inside an aircraft air distribution system a non linear empirical modelling approach
topic	Strömungsakustik (DE-588)4116645-0 gnd Klimaanlage (DE-588)4120572-8 gnd Flugzeugkabine (DE-588)4154784-6 gnd Nichtlineares mathematisches Modell (DE-588)4127859-8 gnd Luftströmung (DE-588)4338131-5 gnd Geräuschanalyse (DE-588)4324422-1 gnd
topic_facet	Strömungsakustik Klimaanlage Flugzeugkabine Nichtlineares mathematisches Modell Luftströmung Geräuschanalyse Hochschulschrift
url	http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=030379742&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
volume_link	(DE-604)BV037366610
work_keys_str_mv	AT bokharisyedfawadrazaali modellingofflownoiseinsideanaircraftairdistributionsystemanonlinearempiricalmodellingapproach AT shakerverlag modellingofflownoiseinsideanaircraftairdistributionsystemanonlinearempiricalmodellingapproach

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