NVH – Department Vehicle Acoustics Advanced Development NVH ...

NVH – DepartmentVehicle AcousticsAdvanced DevelopmentC:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerDipl.-IngIng. Tamino EggnerVehicle Acoustics0043–316316–404–3694tamino.eggner@magnasteyr.comhttp://www.magnasteyrmagnasteyr.com/AUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com1

A power injection measurement based approachfor hybrid SEA modelling forautomotive vibro-acousticsC:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerLMS Conference EuropeMunich, March 23, 2006T. EggnerDr. T. BartoschR. PremstallerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com2

C:\ppt\Eggner_LMS_Conference_2006.pptContent! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com3

Introduction: Predictive SEAUsing AutoSEA from ESI GroupC:\ppt\Eggner_LMS_Conference_2006.pptAdvantages:+ in concept phase possible+ no measurement+ no separate calculation+/- reliabilityAuthor: T. EggnerDisadvantages:- high modelling effort- modelling of trim materialsAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com4

Introduction: Experimental SEASEA parameter measurement usingPIM (Power Injection Method)C:\ppt\Eggner_LMS_Conference_2006.pptAdvantages:+ measured loss factors+ no trim material modelling+ reliabilityAuthor: T. EggnerDisadvantages:- acoustic prototype needed- high measurement effortAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com5

Introduction: Hybrid SEApredictiveexperimentalLF integrationC:\ppt\Eggner_LMS_Conference_2006.ppt++ reliability+ no trim modellingAuthor: T. Eggnerhybrid SEA model- prototype needed- measurement effortAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com6

Introduction: Hybrid SEA modelling processILFPIMmeasurementC:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerAnalyticalSEAHybrid SEAModellingCLFAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com7

C:\ppt\Eggner_LMS_Conference_2006.ppt! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com8

Creating an SEA modelFEMMeasurability!C:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. Eggner! geometric subsystem modelling! definition of material properties! auto connect junctionsSEAAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com9

C:\ppt\Eggner_LMS_Conference_2006.ppt! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com10

Measurement preparationsC:\ppt\Eggner_LMS_Conference_2006.ppt! Creation of measurement list" export of AutoSEA model (with auto-connected junctions)" automated extraction of the measurement list!Check of subsystem measurability! Definition of excitation and response points" take advantage of symmetries" statistically distributed! Definition of “subsystem sets” (channel availability!)Author: T. EggnerLine connectionsArea connections# Excitation nodes # Response Nodes # Excitation nodes # Response NodesSubsystem numbermeasured excitation Subsystem numbermeasured excitation1 ok 15 okA-Säule (AS) A-Säule (1) Innenraum (IR-K) Innenraum (15)B-Säule (4) A-Säule (1)C-Säule (8) B-Säule (4)Dach (6) Boden außen (2)Frontscheibe (5) Boden innen (3)measurement listHeckscheibe (10) Dach (6)Innenraum (15) Fersenblech (7)Instrumententafel (16) Frontscheibe (5)Instrumententafel Seite (18) Instrumententafel (16)Kofferraum (48) Instrumententafel Kav. (17)Kofferraumseite (27) Kofferraum (48)Kotflügel hinten (12) Längsträger 2 (35)Kotflügel vorne (13) Längsträger 3 (36)Luftkanal front Seite (33) Motorraum (40)Luftkanal front innen o (59) Radlaufschale vo Kav. (46)Scheibe 1 (23) Scheibe 1 (23)Scheibe 2 (24) Scheibe 2 (24)Scheibe 3 (25) Schw eller mitte (56)Schw eller vorne (57) Schw eller vorne (57)Türblech außen vorne (31) Sitzw anne (51)4 ok Stirnw and Seite (53)B-Säule (BS) B-Säule (4) Stirnw and unten (54)A-Säule (1) Tunnel (61)Innenraum (15) Türkavität hinten (60)Scheibe 1 (23) Türkavität vorne (62)Scheibe 2 (24) Unterboden Kav. (63)Schw eller mitte (56) 48 okTürblech außen hi (30) Kofferraum (KR-K) Kofferraum (48)Türblech außen vorne (31) A-Säule (1)C-Säule (8)6 okDach Dach (6)(DA) Dach (6)A-Säule (1) Heckabschluss oben (20)Frontscheibe (5) Heckklappe (9)Heckscheibe (10) Heckscheibe (10)Innenraum (15) Innenraum (15)Kofferraum (48) Kofferraumboden (49)Kofferraumseite (27) Kofferraumboden Seite (50)AUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com11

C:\ppt\Eggner_LMS_Conference_2006.ppt! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com12

Measurement: SetupSubsystem types: structural and fluidExcitations: impact force and broadband sound powerResponses: sound pressure and accelerationFormat: FRF# Redundant denotations!C:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com13

Measurement: PIM (Power Injection Method)Based on exciting each subsystem in turn andmeasuring the responses on all subsystems.# Measuring of responses only from adjacent (coupled) subsystemsStep 1responseStep 2, …C:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerSubsystem 1 Subsystem 2Subsystem 1 Subsystem 2excitationSubsystem 3Subsystem 3AUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com14

Measurement: Signal monitoringC:\ppt\Eggner_LMS_Conference_2006.pptOnline signal monitoring (Quality/ Error Checks):! coherence! excitation spectrum:Author: T. Eggner" bandwidth" amplitude (SNR)! time signal of excitation (impulse hammer: double impact)! imaginary part of inertance (a/F) >= 0coherence10.90.80.70.60.50.40.3N/dB60504030coherence (ex:12101; resp:01010)force spectrum (ex:12101)200.2SNR= 34.1dB (response node:01010) SNR= 10.6dB (response node:09007)10-20-200.1noise0signal0-40-400-1 02000 4000 6000 8000 10000 12000-2 0Hz8000 0 2000 4000 6000 10000 12000-60-60Hz-1402500 2000 4000 6000 8000 10000 12000-1400 6000 8000 10000 12000Hz2000 4000200HzAUTOMOBILENTWICKLUNG / ENGINEERINGSNRimag(a/F)-80-100400350-120300150100500SNR-80-100-120point mobility (ex:12101)-500 2000 4000 6000 8000 10000 12000Hznoisesignalwww.magnasteyr.com15

Measurement: ExamplePIM measurement effort on a trimmed body vehicle:Structural subsystems: 46Fluid subsystems: 11Excitation points: 170Response points: 417Measured FRFs: approx. 30,000C:\ppt\Eggner_LMS_Conference_2006.ppt# Export: universal file format (dataset 58)Author: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com16

C:\ppt\Eggner_LMS_Conference_2006.ppt! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com17

Loss factor calculation 1Magna Steyr implementationFeatures:! MATLAB based! Modular toolbox design # open concept! User definable reading module! Supports 3 calculation methods! Effective database & service interface (manages approx. 30,000 FRFs)C:\ppt\Eggner_LMS_Conference_2006.ppt! GUI to check FRFs and compare LF results! Supports 2 export formatsAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com18

Loss factor calculation 2Procedure:C:\ppt\Eggner_LMS_Conference_2006.ppt1. Generation of measurement list*2. Correction of exported universal file data (data set 58)3. Creation of SEAPIM database4. Calculation of normalized energycoupling filter*5. Calculation of inner and coupling loss factors6. Selection/ filtering of couplings*7. Loss factor export* Use only couplings from AutoSEA modelAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com19

C:\ppt\Eggner_LMS_Conference_2006.ppt! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com20

Loss factor integration! MATLAB based! user definableILF and CLF exportfrom SEAPIM ToolboxIntegration strategyC:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerPoint, line and area connectionAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com21

AutoSEA model validationExcitation and response measurement on trimmed body vehicle! Response points: passenger compartment, floor, …! Synthetic excitationmain input points of car body:engine mounting, gearbox mounting, engine compartment, …! Real excitationC:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. Eggnerengine noise and rolling noiseAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com22

C:\ppt\Eggner_LMS_Conference_2006.ppt! Introduction! Creating an SEA model! Measurement preparations! Measurement! Loss factor calculation! LF integration and model validation! SummaryAuthor: T. EggnerAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com23

SummaryTool chain:AutoSEASEAPIM-ToolboxPart 1LMS test.labModel buildingMeasurement list generationMeasurement, data exportC:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerSEAPIM-ToolboxPart 2User definableMatlab scripts,AutoSEALF calculation/ exportLF integration/ validationValidated hybrid SEA modelAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com24

Advantages/ Disadvantages++ high reliability+ no need to model trim material- acoustic prototype (trimmed body) must be available- high measurement effort! calculation of sensitivities (Magna Steyr Toolbox)C:\ppt\Eggner_LMS_Conference_2006.pptAuthor: T. EggnerFurther proceedings:! import of the measurement list as LMS setupAUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com25

C:\ppt\Eggner_LMS_Conference_2006.pptNVH – DepartmentVehicle AcousticsAuthor: T. EggnerDepartment HeadThanks for your attention!Dipl.-IngIng. Macher Harald-Andreas0043–316316–404–190-6792harald.macher@magnasteyr.comhttp://www.magnasteyrmagnasteyr.com/AUTOMOBILENTWICKLUNG / ENGINEERINGwww.magnasteyr.com26