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
Systematic solutions for porous material detection
1. EV/CV engineering challenges
1.1 Challenges faced in EV/CV vehicle development
1.2 What are the commonly used porous materials?
· Used for sound insulation and sound absorption to suppress the spread of airborne sound into the car!
· technical problem:
· How to acoustically model the porous material cotton?
· What acoustic parameters can be used for the forward development of porous materials?
2. Introduction to porous material modeling methods
2.1 Requirements for testing macro-acoustic properties of porous materials and introduction to BOACH shelf product solutions
· Porous material sound absorption and sound insulation tests are standard regulatory tests and can be conducted in accordance with relevant test standards;
· BOACH Acoustics provides shelf products to meet the test regulatory requirements.
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standard |
content |
BOACH acoustic products |
Application areas |
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ASTM E1050 |
Material normal incidence sound absorption coefficient and surface acoustic impedance testing |
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· Sound absorption and sound absorption test under vertical incidence of sound waves; · Material surface acoustic impedance test under vertical incidence; · Acquisition of material equivalent complex sound velocity and complex density. |
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GB/T 18696 |
Material normal incidence sound absorption coefficient and surface acoustic impedance testing |
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ISO10534 |
Transfer function method to test material normal sound absorption coefficient and surface acoustic impedance |
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ASTM E2611 |
Sound insulation and transmission loss testing based on transfer matrix method |
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· Transmission loss test under vertical incidence of sound waves; · Transfer matrix test under vertical incidence; · Acquisition of material equivalent complex sound velocity and complex density; |
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GB/Z 27764 |
National standard sound insulation and transmission loss test standards |
2.2 Introduction to input parameters required for forward development of porous materials
3. Introduction to BOACH acoustic solution for porous material modeling
3.1 Introduction to input parameter testing methods for forward development of porous materials
· Microscopic parameters: density, flow resistivity, porosity, viscous thermal characteristic factors and tortuosity; (used for JCA model construction)·
Macroscopic parameters: complex density, complex sound velocity (used in Familiar with CAE Air definitions)
· 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% |
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
4. BOACH acoustic porous material detection case
5. Summary of BOACH acoustic porous material detection solutions:
5.1 Based on the above description, BOACH can provide customers with the following services or solutions
: Porous material parameter identification (testing equipment + software) solution: hardware is selected or integrated based on the customer's current status; software is provided by BOACH;
Engineering services :
· Porous material parameter identification service;
· Construction of porous material database;
· CAE technical support services for porous material products (including interiors, sound insulation covers, etc.);
· Research and development and sales of porous materials and products.
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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