Exterior Noise Measurements
An assessment of the exterior vehicle noise plays an increasingly important role in analyzing the overall vehicle acoustics. On the one hand, legislation regulates noise emissions by introducing maximum ratings; on the other, car owners’ rising demand for comfort results in a steady reduction in the exterior noise levels of motorized vehicles.
Exterior noise measurements play a role in the granting of certification by official authorities, as well as in the fields of vehicle development and production quality assurance. PAK measurement systems support the user by measuring the exterior noise on measuring tracks amongst others according to:
- ISO 362;
- UN-ECE R 51.03;
- UNECE-R138 for Quiet Cars;
- US CFR 49 Part 571.141;
- ASEP; and
- UN-ECE R 41.
These measurement systems with their user-friendly operation, determine the noise level of a passing vehicle by means of two microphones positioned at a distance of 7.5 m from the vehicle track center, as a function of the distance driven.
PAK data acquisition systems also support measuring the exterior noise on testbenches by simulating Pass-By. Extensive exterior noise measurements can be taken for different vehicle models on a roller testbench for the purpose of developing a characteristic and recognizable vehicle sound, without having to take weather conditions into account.
Idle Noise Measurement
The measurement of idle noise in line with ISO 5130 §6.3 rounds off the PAK system as a comprehensive measuring and analysis tool for measuring exterior noise.