For this reason, chattering windshield wipers and other rattling, creaking or squeaking parts must be avoided by all means. Operating and functional noises must also be designed so that they sound as pleasant as possible to the customer.

Interference noises can be metrologically examined. For this purpose, a servo-hydraulic 4-post test bench can be used for vehicle excitation. For the investigation of operational and handling sounds (or similar) an anechoic test chamber for entire vehicles is available. These noises can also be calculated using simulation methods. Depending on the background noise, structural-acoustic or aeroacoustic methods must be used here.