Sound and Vibration Measurements in the Automotive Industry

The automotive industry constantly improves all parts of the vehicle including engine, interior, parts and the outline of the car. To support this process gfai tech offers a wide range of equipment to measure and analyse all noise and vibration.

The Acoustic Camera can be used on various aspects of automotive applications. In the R&D for optimizing engine noise, improvement of cabin noise, localizing wind noise or decreasing emission of car parts. Another application is the end of line test or quality assurance of the finished vehicle.

Localization of Sound Sources at the Car

Measurements on a Car Engine

The image shows an under-hood measurement of a car. As combustion engines consist of many different parts which emit noise the Acoustic Camera helps to precisely identify which part emits what type of sound within a few minutes. This way the engineers can quickly identify on which part improvements have to be applied.

3D Sound Source Localization Inside a Car

The driver’s and passenger’s comfort in the car is one of the highest values during the acoustic optimization process. In electrical vehicles the overall sound level inside the car is much lower as the engine sound is missing. This results in new challenges as all other sound sources become much more prominent. Using the Acoustic Camera with a sphere array the complete sound emissions inside the car can be mapped on the 3D model of the interior. This way unwanted sound sources can easily be identified while driving or on a test-bench.

Wind Tunnel Measurements

Depending on the speed the wind noise can become the most prominent noise source inside the car. To optimize the aerodynamic outline of each vehicle wind tunnels offer the perfect test conditions. gfai tech provides customized solutions for highest precision in sound source localization in wind tunnels, including shear layer correction, 3D model generation and fitting, correlation analysis and many other features to find the best results.

2016 - On 3D-Beamforming in the wind tunnel - BeBeC - Dirk Döbler, Dr. Christof Puhle, GFaI; Jörg Ocker
2014 - Correlation of parallel car interior and exterior beamforming measurements in a wind tunnel - InterNoise - Stefan Neugebauer, Reinhard Rösel, Dirk Döbler

For more information and downloads have a look at the publications.

DynaBeam - Measurement of a car engine and dashboard

3D sound source localization inside a Car

Modal Analysis when Developing Cars

Modal analysis plays a key role in the development of vehicles. The software WaveImage features all common methods for vibration analysis – Experimental Modal Analysis (EMA), Operational Modalanalysis (OMA), Finite Element Analysis (FEA), Operating Deflection Shapes (ODS), order-tracking and -analysis and many other options. For the analysis of parts the automatic modal hammer WaveHitMAX  is the perfect solution for highly precise single hit excitation.

Experimental Modal Analysis of a Car Rim