Solutions

Panel Noise Contribution Analysis

PNCA4 PNCA1 PNCA2JPG PNCA3 Click to enlarge

The Panel Noise Contribution Analysis is a well-known methodology for an airborne Transfer Path Analysis (TPA) in car interior. Pressure contribution from the individual panels at a reference point can be very accurately calculated. Acoustic Trim package treatment can therefore be optimized in terms of frequency and panel area which saves money and time. The method uses only one type of sensors so called particle velocity probes for measuring source strength as well as transfer function (with a reciprocal measurement).

The Microflown PU-based Panel Noise Contribution Analysis is a very fast and accurate method to measure and analyse sound source distributions inside vehicles. Four steps are required to determine typical around 110 panel noise contributions of the interior of a vehicle and to visualize the results in 3D. In the first step the probes are positioned on the interior surfaces The second step is a measurement in a vehicle mode of operation. This step can be done in a laboratory but it is also possible to perform the measurement while driving the vehicle on the road including e.g. windand tyre noise. The source strengths are determined by measuring the acoustic particle velocity close to the panel surfaces. The third step is the determination of the transfer paths from the panels to a certain listening position. This measurement is done reciprocally by using an omnidirectional sound source at the listeners position and measuring the sound pressures at the panels . In a fourth and last step the transfer paths are linked with the operational data gathered in step two. 

Features

  • Frequency range 100Hz - 2kHz
  • Very high degree of detail; typically 110 single surface contributions
  • Very fast; measurements can be performed in just 1 day
  • Very flexible; measurements can be performed whilst driving
  • Ideal for sound package optimization and trouble shooting
  • Method maintains the structue and acoustic properties of the vehicle

Publications

Ebook

 

 

   

Monopole sound sources

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PU mini 

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    Scattered Array

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