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    电动和混动汽车声学设计与NVH开发.pdf

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    电动和混动汽车声学设计与NVH开发.pdf

    2018汽车NVH 控 制 技 术 国 际 研 讨 会 电动和混动汽车声学设计与NVH 开发 Methods for Sound Design and NVH Development of Electric and Hybrid VehiclesDipl.-Ing. Daniel Riemann NVH咨询部门高级项目经理 Senior Project Manager, consult NVHMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 3 Introduction Sound Design and NVH Development for environment friendly vehicles EV, HEV Interior Noise Sound cleaning P/T noise Wind noise Tire noise Sound Design / Enhancement P/T noise ANC ANE Exterior Noise Sound cleaning Sound enhancement Pedestrian warning system Drivability Range weight Cost Focus on potential customer Innovative methods and tools are required Methods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 4 Typical Tasks during NVH Development Timeline NVH Development Benchmarking and Target Setting NVH Development Concept Phase SOP Prototyping Design phase TPA Simulation PCA ANC/ANE Sound Quality Metric Target Sound Design Define Targets on vehicle and source/path level FEM/BEM CFD MBS Identify root causes Estimate potential Develop countermeasures Optimize vehicle trim package Active Sound designMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 5 Benchmarking and Target Sound Development Development of Sound Quality Targets with clear focus on the potential Customer  What is the expectation of the potential customer / driver  How do people drive  When do they like the sound or complain about the sound  How often do these situations occur during normal driving  What NVH issues are really important - HEAR will help to find the answersMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 6 HEAR – Head Empirical Assessment Ride Procedure for Test Drives  Vehicle evaluation in realistic environment, during real driving.  People comment in their own words what they like and dont like.  Recording of relevant vehicle and P/T parameters.  Experts and potential customers can be integrated in this process.  Analysis of comments and vehicle information  Identification of relevant conditions HEAR evolved from the EVE Method Positive Conditions Negative Conditions Test driver comments are seen in the driving condition context Test drive evaluation pinpoints the most important needs for improvement Clustering of comments reveals important issues Analysis of Test Drives Driving Condition Maps e.g. electrical power vs speed “powertrain point of view” Test drives Post processingMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 7 HEAR Benchmark and Target Sound Development Development of Sound Quality Targets Test Drives, Additional Roller Dyno Measurements, Jury Tests, Targets, Sound Quality Metrics Procedure of Test Drives, HEAR method Identification of relevant operating conditions Comparable acoustic roller dyno measurements under defined and reproducible conditions Jury Test Evaluation for Sound Quality Investigations and Target Definition Definition of Sound Quality Metrics for automatic calculation of perceived sound quality optionalMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 8 HEAR Target Development based on Benchmark Tests  For each phenomenon, relevant driving conditions are identified and compared  For all relevant phenomena, target values or target curves are developed based on the vehicle benchmark  The suggested targets are realistic, and in fact reached by at least one of the benchmark vehicles selection of relevant measurement condition performance of comparable roller-dyno measurements identification of suitable analysis methods definition of target values or curves based on the vehicle benchmarkMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 9 BTPA Interior Noise Synthesis in Time Domain  Time domain calculation enables auralization of results  Convolution of measured excitations with corresponding transfer functions leads to realistic Interior noise synthesis, even for transient noises  No limitation of analyzing only stationary conditions  transient, run-ups coast, tip-ins, etc. possible  Listen to interior noise contributions at each step of the BTPA process  Evaluation of transfer path modifications by means of interior noise synthesis Sum Path 1 Path 2 Path 3 Path 4 Path 5 Path 6 Path 7 Path 8 Path 9 Interior Noise Contributions Sound pressure at drivers ear p a p a Structure Borne Noise Sources Airborne Noise Sources Transfer path Transfer path Transfer path Transfer path Sources Paths10 Methods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH BTPA Structure Borne - HEAD Effective Mount Transfer Consideration EMTF Matrix- inversion Inverted Inertances Passive side Accelerations ෨ 𝐹 1 𝐼𝐹𝐷 𝑡 ෨ 𝐹 𝐾 𝐼𝐹𝐷 𝑡 𝑎 1 𝑃𝑆 𝑡 𝑎 𝑙 𝑃𝑆 𝑡 𝑎 𝐿 𝑃𝑆 𝑡 Operational Forces Interior Noise Acoustic Transfer Functions ෥ 𝑝 𝑖 𝑡 𝐻 1 , 𝑖 𝐴 𝑇𝐹 𝑓 𝐻 𝐾 , 𝑖 𝐴 𝑇𝐹 𝑓 𝑎 1 𝐴𝑆 𝑡 𝑎 𝑘 𝐴𝑆 𝑡 𝐻 1 𝑀𝑇𝐹 𝑓 𝐻 𝑘 𝑀𝑇𝐹 𝑓 ෨ 𝐹 1 𝑀𝑇𝐹 𝑡 ෨ 𝐹 𝐾 𝑀𝑇𝐹 𝑡 w/o rubber mounts Rubber Mounts Effective Mount Transfer Functions ෥ 𝑝 𝑖 𝑡 𝐻 1 , 𝑖 𝐴 𝑇𝐹 𝑓 𝐻 𝐾 , 𝑖 𝐴 𝑇𝐹 𝑓 11 Methods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH BTPA Structure Borne – Integration of CAE into BTPA Process Simulation model Simulation results Vehicle / test bench measurements Transfer path analysis and interior noise synthesis Evaluation of estimated sound12 Methods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH Example BTPA Results for Electric Vehicle 7,34 29/30 58 14,68 29 7,34 10 29 60 Sum Structure borne Airborne Left ear Original optimized airborne transmission Airborne drive shafts mounts Run up WOT, roller dyno, FFT vs. rpm, airborne and structure borne shares  Estimation of potential for countermeasures synthesis Original Modification Validation Validation measurements Airborne IsolationMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 13 Binaural Panel Contribution Analysis BPCA Which panel has the strongest contribution How to improve the vehicle trim package n panels m PU probes per panel vATF Result of TPA Force [N] Interior noise [SPL] Black Box NTF Sound pressure level in the vehicle compartment is the sum of the sound contributions of all surfaces enclosing the cabin.Methods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 14 BPCA Procedure and Results, Example Tire/Road Noise 130-100 kph Panel 1 sub panel 1 v sub panel m v Q Q p RTF RTF Panel 2 sub panel 1 v sub panel m v Q Q RTF RTF Panel n sub panel 1 v sub panel m v Q Q RTF RTF i i i n i i i S v Q RTF Q p       20 1 / i i i i v S Q p RTF n Q p Sound pressure Source strength of surface i Number of panels Reciprocal Transfer Function Area of surface i Particle velocity at the surface i Q p Rear left door Left B-pillar 1/6th octave bands, max of both ears Front left doorMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 15 Case Study Sound Design for Active Noise Enhancement System ANE Creation of synthetic sounds for electric vehicles HEAD consult NVH is involved in synthetic sound design for electric vehicles Electric Vehicle Interior Sound Driver focus Emotional feedback for the driver Vehicle brand character Electric Vehicle Exterior Sound Pedestrian focus Warning attribute Vehicle brand character Conformance to international regulations  Design of synthetic sounds interior  RPM / vehicle speed / load controlled parametric response  Playback in simulator system ANE  HEAR - evaluation of customer acceptance for different synthetic sounds Case Study Vehicle data CAN Sound Playback ANE Test SystemMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 16 Case Study Customer Acceptance of Synthetic Sounds „unobtrusive“ „Modern“1 „ICE like sound“ „no additional Sound“ Only Original Sound Original Sound synthetic sound based upon sound of ICE Original Sound “modern” synthetic sound Original Sound unobtrusive synthetic sound Methods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 17 Driving Condition Maps and Distribution of Customers Comments  Distribution of comments positive, negative and neutral for different sound concepts versus acceleration and speed „ICE like“ Sound „Modern“ Sound „unobtrusive“ Sound 45 26 29 3 – „unobtrusive“ Sound 33 45 22 1 – „ICE like“ Sound 32 42 26 4 – no added Sound 17 44 39 2 – „Modern“ Sound Positive Negative Neutral Positive Negative Neutral Positive Negative Neutral Positive Negative NeutralMethods for sound design and NVH development of environment-friendly vehicles with customer focus HEAD acoustics GmbH 18 Summary Methods for Sound Design and NVH Development Timeline NVH Development Benchmarking and Target Setting NVH Development HEAR BTPA BPCA ANC / ANE HEAD Methods and Tools Concept Phase SOP Prototyping Design phase CAE integrationDipl.-Ing. Daniel Riemann Senior Project Manager, consult NVH Daniel.Riemannhead-acoustics.de www.head-acoustics.de Copyright HEAD acoustics GmbH Thank you for your attention. 感谢您的关注

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