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  Consulting    NVH Division    Methods/ Tools     Binaural Panel Contribution Analysis - BPCA
NVH Consulting - Binaural Panel Contribution Analysis - BPCA
Which panel has the strongest contribution regarding the disturbing noise?
Floor, cockpit, roof front, roof rear, left side, right side, rear seat?
Which partial surfaces are most productive for applying acoustic countermeasures?
Detailed Analysis: Distribution of sound contributions within each individual panel!
 
Panel Contribution Analysis (BPCA)
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Panel Investigation
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Verification of Total Simulated Noise
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Comparison of BPCA with the
Conventional "Window Method"
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Vehicle interior noise can be regarded as the sum of all panel contributions which enclose the compartment. In order to experimentally investigate the sound contributions of individual panels, the so-called "window method" is often used. However, the traditional window method has a lot of disadvantages. Due to some fundamental drawbacks, a new method has been invented by HEAD acoustics which is considered a useful alternative.
Panel Contribution Analysis (BPCA) Back to the top
The procedure has been tested successfully on several vehicles. In this example, the vehicle interior was subdivided into seven panels. In detail, these were the floor, cockpit, roof front, roof rear, left side, right side, and rear seat.
Each array comprised 20 sensors, resulting in a total of 140 investigated subpanels.
Example: subdivision into seven panels
Click here for a detailed view
 
Panel Investigation Back to the top
Each individual panel can be investigated in detail. In this example, the right side of the vehicle compartment was subdivided into twenty subpanels. It is possible to analyze and auralize each subpanel. A Campell diagram of subpanel 5 is shown in the Figure (above). BPCA enables one to find the critical subpanels easily and rapidly.
In another example, it can be seen that the floor has the strongest contribution to the interior noise.
 
20 subpanels of the floor were further analyzed to localize the problem sections. The method works in the time domain; therefore, contributions of each panel can be auralized and analyzed with different analyses e.g. FFT vs. Time, Order analysis at critical rpm, etc.
Verification of Total Simulated Noise Back to the top
In the figure below, the spectrum of the calculated sum of all surface contributions (green) compared with the spectrum of a real measurement (red, the vehicle interior noise is aurally adequate recorded via binaural head microphone).
The comparison of both curves shows a very good agreement between simulation and measurement.
Comparison of BPCA with the Conventional "Window Method" Back to the top
    Conventional Method  
BPCA
Insulation material  
necessary
 
no
Time duration  
approx. 2 weeks (10 - 20 panels)
 
approx. 4 days (140 panels)
Gained information
density
 
medium (approx. 10 - 20 surfaces)
 
high (140 surfaces)
Flexibility in choice
of running condition
 
in general restricted to test stand measurements
 
full flexibility (street, test stand, wind, rain, gravel road)
Impact on vehicle
acoustics
 
change of absorption, structural change
 
no impact
Applicable
frequency range
 
from approx. 80 Hz (limitation due to mass law); above 400 Hz limitations due to altered vehicle acoustics
 
80 Hz - 2 kHz
depending on exciltations
Accuracy of results  
qualitative
 
quantitative
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横浜ビジネスパーク ウエストタワー8F

Email: info@head-acoustics.co.jp
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