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VA One


ESI Group 汽车行业 噪声 & 振动问题
2013年8月4日

Copyright ? ESI Group, 2012. All rights reserved.

1

Overview

VA One Overview Full Vehicle Interior Noi

se Modeling Component Level Modeling

Copyright ? ESI Group, 2012. All rights reserved.

2

What is VA One?
The industry standard software for low, mid and high frequency vibro-acoustic analysis and design

Used by over 500 companies worldwide in virtually every industry for which noise and vibration is important
Copyright ? ESI Group, 2012. All rights reserved.
3

VA One
Main modules and extension modules

Aero-Vibro Acoustics FE structure
FSP BSR

Squeak & Rattle

BEM Foam

Periodic

FE acoustic

Hybrid Stress
Design optimization

Design Optimization

SEA Developer kits BEM Grid …

VA One

VA One Extension modules
Copyright ? ESI Group, 2012. All rights reserved.
4

Modeling solutions
Typical FE (deterministic) response Typical SEA response Response

(frequency domain)

Typical response
Low frequency

Variance
High frequency Frequency Hz

(spatial domain) Global Modes

Localized response

FEA
Typical numerical solutions

BEM Hybrid FE-SEA SEA
Copyright ? ESI Group, 2012. All rights reserved.
5

Low frequency “FE/BEM” modules

Work with FE structural subsystems

Model bounded or unbounded fluids with BEM

Model bounded fluids with FE

VA One

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6

Fast Multiple Method BEM
Detailed horn directivity model FMM vs. standard BEM
1e4 1e3

CPU time 1e2 (s)
1e1

Standard BEM FMM BEM

Sound transmission through perforated bumper and diffraction around vehicle exterior at 2kHz

1e0 1e3 1e4 1e5 1e6

Number of nodes

Copyright ? ESI Group, 2012. All rights reserved.

7

Case study # 9 : 外声场 SPL
快速多级边界元模型的散射问题

- 使用快速多级边界元模型可以预测由多个声 源形成的结构表面声压分布 (胎噪) - 使用结果更新SEA模型的空气声载荷 - 优点 :预测由于车身形状变化对外声场压力 载荷分布的影响
125 Hz 250 Hz

5 dB
SPL (dB ref. 2E-5 Pa)

500 Hz

1000 Hz

Measured SEA model - exp. exterior noise SEA model - num. exterior noise 100 125 160 200 250 315 400 500 630 800 1000 1250

Frequency (Hz) [8] T. Connelly, Kent Fung “Validation of Interior noise prediction obtained using SEA and Fast Multipole BEM”. Proc. SAE N&V, 2009

Copyright ? ESI Group, 2012. All rights reserved.

High frequency “SEA” module

Quick system level models of complex systems at high frequencies

VA One

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9

SEA – High Frequency
Interior noise (Audi) Interior noise (Sikorsky) Interior Noise Interior noise in luxury yachts

J. Venor, “Total Vehicle SEA modeling in the real world”, Proc. Euronoise 2009

SEA Interior Noise Validation for Rotorcraft, D.J.Butts , AHS Aeromechanics Conf 2008

Design of Acoustic Insulation in Ships Based on Predictive VA Models, Blanchet et al, Proc. DAGA 2011
Copyright ? ESI Group, 2012. All rights reserved.
10

Mid frequency “Hybrid” module

Couple FE and SEA together for fast models at mid-frequencies

VA One

Copyright ? ESI Group, 2012. All rights reserved.

11

Examples : Hybrid System level
Structure-borne noise 200 Hz – 1 kHz SB and AB noise in Machine Cabs Structure-borne noise in launch vehicles

A. Charpentier et al, “Modeling process and validation of Hybrid FE-SEA method for structure-borne noise paths in a trimmed automotive vehicle”. Proc. SAE NVH Brazil, 2008

Noise and Sound Quality Optimization of Agricultural Machine Cab, Cerrato, Connelly et al, SAE 2010 paper

B. Prock “VA Hybrid modeling and analysis of the ARES roll control system”, Proc. SCLV 2008

Copyright ? ESI Group, 2012. All rights reserved.

12

VA One
Use for prediction of wind noise transmission into the vehicle

Aero-Vibro Acoustics FE structure BEM
FSP BSR

Squeak & Rattle

Foam FE acoustic

Periodic

Hybrid Stress
Design optimization

Design Optimization

SEA Developer kits BEM Grid …

VA One

VA One Extension modules
Copyright ? ESI Group, 2012. All rights reserved.
13

Case study: Audi
Fit TBL to windtunnel data, apply to Hybrid FE-SEA model

A. Businger et al “Computation of underbody flow aero-acoustics for a production vehicle” Proc. EuroPAM 2010 Copyright ? ESI Group, 2012. All rights reserved.
14

VA One – BSR Module
Use for efficient rattle noise predictions

Aero-Vibro Acoustics FE structure
FSP BSR

Squeak & Rattle

BEM Foam

Periodic

FE acoustic

Hybrid Stress
Design optimization

Design Optimization

SEA Developer kits BEM Grid …

VA One

VA One Extension modules
Copyright ? ESI Group, 2012. All rights reserved.
15

Case study: Console Rattle
1. Use detailed FE model to predict contact forces at rattle locations 3. Rank rattle events by SPL / loudness

S. Mertz et al, “Predicting the Loudness of Rattle in a Center Predicting the Loudness of Rattle in a Center Console”. Proc. of InterNoise, 2012

2. Use SEA model to predict radiated noise over broad frequency range
Copyright ? ESI Group, 2012. All rights reserved.
16

VA One – Optimization Module
Use for optimization of car sound package and more

Aero-Vibro Acoustics FE structure
FSP BSR

Squeak & Rattle

BEM Foam

Periodic

FE acoustic

Hybrid Stress
Design optimization

Design Optimization

SEA Developer kits BEM Grid …

VA One

VA One Extension modules
Copyright ? ESI Group, 2012. All rights reserved.
17

Example applications
Balancing sound package Optimizing mufflers to increase TL Optimizing panel geometry to increase TL

Optimum design Original design

Objective fn. SPL (2 kg/scale)

Optimized design Original design

Time (Hours)

Automatically “balance” sound package to reduce weight/cost while still meeting SPL targets.

Automatically change the geometry of a muffler to increase low frequency TL

Automatically change the geometry of a ribbed panel to increase low frequency TL

Copyright ? ESI Group, 2012. All rights reserved.

18

VA One release history
6 major releases within the past 3 years

VA One 2010
April 2010

VA One 2010.5
March 2011

VA One 2011
Sept 2011

VA One 2012
May 2012

Design optimization

80 enhancements General enhancements to all modules. Theme = contribution analysis and methods to diagnose response.

75 enhancements Focused on -Squeak and Rattle - Aero-vibroacoustics - General Enhancements

Includes: - Performance enhancements - Additional FE entities - Productivity enhancements - Python scripting - Duct modeling

Includes: - New Design Optimization module - SEA productivity enhancements -BEM enhancements

Current release
Copyright ? ESI Group, 2012. All rights reserved.

Overview

VA One Overview Full Vehicle Interior Noise Modeling Component Level Modeling

Copyright ? ESI Group, 2012. All rights reserved.

20

ESI Vibro-Acoustic Solutions for..
… predicting interior noise in trimmed full vehicles:
Low Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN+ABN
Structure: Acoustic: Trim:

High Frequency ABN
Structure: Acoustic: Trim: SEA SEA SEA

FEM

FEM

FEM

FEM

SEA

SEA

FEM + SEA

SEA

SEA

70 60 50 40 30
Pressure (dB), P ref=2e-5

MEASURE RAYON-VTM

20 10 0 50 100 150 200 250 300 350 400 Frequency (Hz) 450

500

Specifics: ? Detailed trim (including boundary conditions) ? Integrated to Nastran Best use: ? Structure Borne ? 20Hz to 400Hz

Specifics: ? Quick radiation model (Hybrid formulation) ? Quick trim evaluation Best use: ? Structure Borne ? 150Hz to 500Hz

Specifics: ? Reuse SEA model data ? Only solution up to 1kHz ? Quick trim evaluation Best use: ? SBN and Airborne ? 250Hz to 800-1kHz

Specifics: ? Statistical model ? All paths modeled (including leakage & passthroughs) Best use: ? Airborne ? 300Hz to 10kHz

Low (<250Hz)

Mid (200Hz-1kHz)
Frequency Range

High (>600-800Hz)
Copyright ? ESI Group, 2012. All rights reserved.
21

Low Frequency Range
Renault / Treves system level FEM/PEM model
This method is used for the prediction of structure borne noise and estimation of ear level SPL in narrow band and investigate impact of sound package shape and boundary conditions
Example validation results (ear position SPL):
70 60 50 40
Pressure (dB), Pref=2e-5

Structural FE model

Acoustic FE model

+
Trim FE model

30 20 10 0

50

100

150

200

250 Frequency (Hz)

300

350

400

450

500

M. Anciant et al, Full Trimmed Vehicle Simulation by using RAYON-VTM, Proceedings of JSAE 2007.

Used for: ? Structure borne noise prediction ? From 20Hz to 400Hz Benefits: ?Easy to parallelize ?Includes effect of trim boundary conditions and trim curvature ?Can be integrated into Nastran solution process

Copyright ? ESI Group, 2012. All rights reserved.

22

ESI Vibro-Acoustic Solutions for..
… predicting interior noise in trimmed full vehicles:
Low Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN+ABN
Structure: Acoustic: Trim:

High Frequency ABN
Structure: Acoustic: Trim: SEA SEA SEA

FEM

FEM

FEM

FEM

SEA

SEA

FEM + SEA

SEA

SEA

70 60 50 40 30
Pressure (dB), P ref=2e-5

MEASURE RAYON-VTM

20 10 0 50 100 150 200 250 300 350 400 Frequency (Hz) 450

500

Specifics: ? Detailed trim (including boundary conditions) ? Integrated to Nastran Best use: ? Structure Borne ? 20Hz to 400Hz

Specifics: ? Quick radiation model (Hybrid formulation) ? Quick trim evaluation Best use: ? Structure Borne ? 150Hz to 500Hz

Specifics: ? Reuse SEA model data ? Only solution up to 1kHz ? Quick trim evaluation Best use: ? SBN and Airborne ? 250Hz to 800-1kHz

Specifics: ? Statistical model ? All paths modeled (including leakage & passthroughs) Best use: ? Airborne ? 300Hz to 10kHz

Low (<250Hz)

Mid (200Hz-1kHz)
Frequency Range

High (>600-800Hz)
Copyright ? ESI Group, 2012. All rights reserved.
23

Mid (150-600Hz) Frequency Range
Large GM system level Hybrid FE-SEA model
This method is used for the quickly adding acoustics to an existing structural FE model and perform efficient SBN predictions over multiple iterations of sound package

Structural FE model

+

Acoustic SEA model

Interior acoustics response:

SEA trim model
Used for: ? Structure noise prediction ? From 150Hz to 400-600Hz Benefits: ?Quick / easy model creation ?More computationally efficient than FEM ?Quick trim change evaluation (1 min) ?Leverages airborne SEA model (acoustics, trim definition) ?Easy process automation ?Easy GUI customization
Copyright ? ESI Group, 2012. All rights reserved.
24

C. Wang & al, An Efficient Modeling Approach for MidfrequencyTrim Effects, Proceedings of SAE conf., 2011

ESI Vibro-Acoustic Solutions for..
… predicting interior noise in trimmed full vehicles:
Low Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN+ABN
Structure: Acoustic: Trim:

High Frequency ABN
Structure: Acoustic: Trim: SEA SEA SEA

FEM

FEM

FEM

FEM

SEA

SEA

FEM + SEA

SEA

SEA

70 60 50 40 30
Pressure (dB), P ref=2e-5

MEASURE RAYON-VTM

20 10 0 50 100 150 200 250 300 350 400 Frequency (Hz) 450

500

Specifics: ? Detailed trim (including boundary conditions) ? Integrated to Nastran Best use: ? Structure Borne ? 20Hz to 400Hz

Specifics: ? Quick radiation model (Hybrid formulation) ? Quick trim evaluation Best use: ? Structure Borne ? 150Hz to 500Hz

Specifics: ? Reuse SEA model data ? Only solution up to 1kHz ? Quick trim evaluation Best use: ? SBN and Airborne ? 250Hz to 800-1kHz

Specifics: ? Statistical model ? All paths modeled (including leakage & passthroughs) Best use: ? Airborne ? 300Hz to 10kHz

Low (<250Hz)

Mid (200Hz-1kHz)
Frequency Range

High (>600-800Hz)
Copyright ? ESI Group, 2012. All rights reserved.
25

Mid (200-1000Hz) Frequency Range
Nissan system level Hybrid FE-SEA model
This method is used for the prediction of structure borne noise over a wide frequency range, establish noise transfer paths and quickly evaluate impact of trim design changes
Example validation results (average panel vibration & cavity SPL):

+

A. Charpentier et al, “Modeling process and validation of Hybrid FE-SEA method for structure-borne noise paths in a trimmed automotive vehicle”. Proc. SAE NVH Brazil, 2008

Used for: ? Structure & airborne noise prediction ? From 250Hz to 1000Hz Benefits: ?Only method available to predict structure borne noise up to 1kHz ?Computationally efficient ?Leverages airborne SEA model (acoustics, trim definition) ?Quick swap of sound packages ?Structural transfer paths are traceable
Copyright ? ESI Group, 2012. All rights reserved.
26

ESI Vibro-Acoustic Solutions for..
… predicting interior noise in trimmed full vehicles:
Low Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN
Structure: Acoustic: Trim:

Mid Frequency SBN+ABN
Structure: Acoustic: Trim:

High Frequency ABN
Structure: Acoustic: Trim: SEA SEA SEA

FEM

FEM

FEM

FEM

SEA

SEA

FEM + SEA

SEA

SEA

70 60 50 40 30
Pressure (dB), P ref=2e-5

MEASURE RAYON-VTM

20 10 0 50 100 150 200 250 300 350 400 Frequency (Hz) 450

500

Specifics: ? Detailed trim (including boundary conditions) ? Integrated to Nastran Best use: ? Structure Borne ? 20Hz to 400Hz

Specifics: ? Quick radiation model (Hybrid formulation) ? Quick trim evaluation Best use: ? Structure Borne ? 150Hz to 500Hz

Specifics: ? Reuse SEA model data ? Only solution up to 1kHz ? Quick trim evaluation Best use: ? SBN and Airborne ? 250Hz to 800-1kHz

Specifics: ? Statistical model ? All paths modeled (including leakage & passthroughs) Best use: ? Airborne ? 300Hz to 10kHz

Low (<250Hz)

Mid (200Hz-1kHz)
Frequency Range

High (>600-800Hz)
Copyright ? ESI Group, 2012. All rights reserved.
27

High Frequency Range
Nissan system level SEA model
This method is commonly used for the prediction of airborne tire / engine / exhaust noise and quick evaluation of sound package acoustic performance (sensitivity studies, optimization…)
Loudspeaker under Engine Cavity
Experimental mic 1 Experimental mic 2 AutoSEA2 simulation Experimental mic 1 Experimental mic 2 AutoSEA2 simulation

Example validation results (average cavity SPL):

10 dB Front Seat Headspace
315 400 500 630 800 315 400 500 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000

Rear Seat Headspace
630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000

Loudspeaker in Front Wheel House
Experimental mic 1 Experimental mic 2 AutoSEA2 simulation Experimental mic 1 Experimental mic 2 AutoSEA2 simulation

Front Seat Waist Level
315 400 500 630 800 315 400 500 2000 2500 3150 4000 8000 1000 1250 1600 5000 6300

Rear Seat Waist Level
630 800 1000 2500 3150 4000 1250 1600 2000 5000 6300 8000

et al, Full uses mic 1 A. CharpentierExperimental mic 1 vehicle SEA modelExperimental Experimental mic 2 mic 2 detailed sound package to predict driver’s AutoSEA2 headspace acoustics response, Proceedings of Internoise 2004.

Loudspeaker in Rear Wheel House

Used for: ? Airborne noise prediction ? From 300Hz to 8-10kHz Advantages / drawbacks: ?Computationally efficient (<1min) ?All paths are modeled (including leakage, passthroughs) and individually traceable ?Easy automation / GUI customization
Copyright ? ESI Group, 2012. All rights reserved.
28

Overview

VA One Overview Full Vehicle Interior Noise Modeling Component Level Modeling

Copyright ? ESI Group, 2012. All rights reserved.

29

GM dash Hybrid FE-SEA model
Hybrid = add “local detail” to system level SEA models
- Typical (local) Hybrid FE-SEA applications - Add more detail to SEA models - Add more detail to local junctions etc. - Dash application - SEA fluids + FE structure - Used to predict bare dash TL - Used to diagnose local resonance problem

Q. Zhang et al, “Using the Hybrid FE-SEA method to predict and diagnose component transmission loss”, Proc. SAE N&V 2007
Copyright ? ESI Group, 2012. All rights reserved.
30

Seal Hybrid FE-SEA modeling
Hybrid = add “local detail” to system level SEA models
- Typical (local) Hybrid FE-SEA applications - Add more detail to SEA models - Add more detail to local junctions etc. -Seal application - SEA fluids + FE structure/cavity - Use to predict TL of different seals - Use to update system level SEA models

J. Cordiolli et al, “Prediction of sound transmission through door seals using the hybrid FE-SEA method”, Proc. SAE Brazil 2010
Copyright ? ESI Group, 2012. All rights reserved.
31

Hybrid FE-SEA modeling
Muffler Sound Transmission Loss Model

- Prediction of insertion loss of a muffler - Prediction of shell noise from a muffler - Hybrid model used FE acoustic + SEA structure + SEA fluids

[6] T. Connelly et al “Prediction of Muffler Insertion Loss and shell noise by a Hybrid FE-SEA model”, Proc. Noisecon 2010

Copyright ? ESI Group, 2012. All rights reserved.

32

The End

Copyright ? ESI Group, 2012. All rights reserved.

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