Systemic solutions
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Automobile Industry
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Low Noise Solution For Intake And Exhaust Systems
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Interior Product Performance Optimization And Cost Reduction Solutions
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Low Noise Solution For Hydrogen Fuel Cell System
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Low Noise Solution For Vehicle Electric Drive System
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Low Noise Solution For Vehicle Air Conditioning System
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Vehicle Damping Layout Optimization And Lightweight Solutions
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Aviation Industry
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Material Industry
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Other Industry
1. Engineering Challenges
1.1 Challenges faced in development
1.2 Typical materials used in automobiles
1.3 Key parameters of materials
· Product development involves a variety of materials of various types;
· How to manage materials after testing and automatically build a database to facilitate product design and development;
· The software independently developed by BOACH Acoustics supports the automatic construction function of material database.
2. Introduction to BOACH acoustic material testing solutions
2.1 Introduction to structural/damping material detection solutions
· Obtain parameters such as material Young’s modulus, loss factor, density, etc.;
· Case:
· Glass/plastic/rubber/damping/ceramic/metal, etc.
Note: For detailed product introduction, please refer to the product center
2.2 Structural/damping material testing and database construction to guide vehicle damping layout optimization
· Identify the material types: 1) Asphalt damping; 2) Ding-green rubber damping; 3) Water-based damping; 4) Automotive rubber.
· Damping layout optimization objectives:
· Carry out lightweight design analysis of the entire vehicle based on NVH performance evaluation;
· Carry out automated command flow development based on ACTRAN to realize automatic optimization of damping arrangements, and conduct performance verification through testing methods.
2.3 Introduction to solutions for porous material detection and database construction
2.3.1 Introduction to input parameter testing methods for forward development of porous materials
· Microscopic parameters: density, flow resistance, porosity, viscous thermal characteristic factor and tortuosity; (used for JCA model construction) ·
Macroscopic parameters: complex density, complex sound velocity (Familiar definition for CAE air)
· Equipment:
· Microgravity scales, measuring cups, etc. (testing porosity and density)
· Impedance tube (and customized material parameter software): flow resistance, viscosity/thermal characteristic factor and tortuosity
· Flow resistance meter: test flow resistance rate
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Method summary |
Method description |
Guideline |
Recognition results |
Data reliability |
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direct test method |
Drainage method to test density and porosity |
ASD-STAN PREN 6018-1990；GB/T1463-2005 |
constant porosity |
Verified multiple times, data is reliable |
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direct test method |
Two Load Method |
ASTM E 1050 |
array with frequency |
Data is reliable (low-frequency errors are large) |
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direct test method |
Gas flow pressure difference test method |
ASTM-C522/ISO9053 |
Flow resistance/acoustic impedance |
Data is reliable |
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Curve Fitting Test Method |
Curve fit to find flow resistivity based on empirical equations, Simon al., 2006 |
Same as above |
Resistivity results |
Data is reliable, error <5% |
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Curve fit to find Biot parameters based on theory |
Find bulk properties from fitted Biot parameters, Allard, J.F, 1999 |
Flow resistance/porosity/viscosity factor/tortuosity |
Data is reliable, error <5% |
2.3.2 BOACH acoustic porous material micro-parameter testing solution
· JCA acoustic model parameter acquisition BOACH acoustic solution;
· Parameter acquisition based on a combination of direct testing and inversion method;
· Testing and verification are carried out at the same time, and preliminary program demonstration is carried out to realize the process of testing.
1. Obtained by direct test: material porosity test
2. Obtained by direct test: material flow resistivity test
3. Obtained by direct test: material tortuosity test
4. Obtained by indirect inversion : inversion of other parameters of the material
5. Error analysis: Determination of material parameters
2.4 BOACH acoustic porous material detection and database serve acoustic package design and development cases:
· More material testing results and databases can be directly combined with CAE software for forward product design and development.
3. Summary of BOACH acoustic material testing database systematic solutions
Contact us
Phone：
Email：
Address：
Room 901, Building 1, Phase 2, Yungu Phase 2, Fengxi New Town, Xixian New District, Xixian New District, Xi'an City, Shaanxi Province
Room 307, Building 1, Harbin Institute of Technology Robot Industrial Park, No. 488 Qianjin East Road, Economic Development Zone, Kunshan City, Jiangsu Province
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