Automotive NVH

Panel Noise Contribution Analysis

PNCA4 PNCA1 PNCA2JPG PNCA3 Click to enlarge

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 180 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 and their x,y,z coordinates are measured. Based on these data a 3D geometry model is created. The geometry data are acquired using a Microflown Octopus 3D Digitizer. 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. Stationary as well as non-stationary running conditions such as run ups are accessible and do not limit the applicability. 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. The results are then visualized using the 3D geometry model. The results can be analyzed in both frequency and time domain.

Features

  • Frequency range 100Hz - 2kHz
  • Very high degree of detail; typically 180 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
  • Results given in time and frequency domain

Leaflet

Publications

Ebook