LidEO - Airborne sound analysis in the end-of-line test of the automotive industry

Each motor has a specific sound and therefore an acoustic fingerprint when functioning properly. Changes in its sound behavior indicate a changed functionality. Acoustic measurement methods can therefore be used for quality analysis and assessment of electric engines, for example, in order to monitor their functionality and condition automatically.

In the LidEO project, Fraunhofer IDMT is currently developing a measuring system to test the quality of engines for car seats. In the past, the components manufactured for integration in vehicles were assessed by using classical structure-borne noise measurement methods. However, this method causes problems if tests have to be carried out on already installed engines, as the vibrations can no longer be taken directly from the engine.

The aim of this project is to develop a flexible and robust procedure that monitors the quality and functionality of car seat engines under various practical conditions in end-of-line tests by means of airborne sound analysis.

Responsibilities of Fraunhofer IDMT

  • Optimizing the ratio of noise and target sound
  • Automatic and robust feature extraction and analysis
  • Development of a business model


  • GÖPEL electronic GmbH


  • Thüringer Aufbaubank (TAB)




Acoustic methods for quality assurance in industrial use