Vibration Optimization of SiA Sensors for a Navigation Power Plant

Customer: Confidential
Country: France
Area of application: Aeronautics

The challenge

Metravib Engineering was called in to resolve malfunctions associated with certain accelerometric sensors used in a navigation system. These sensors showed anomalies under certain vibratory and acoustic conditions, in particular in environments subjected to metallic shocks or weak acoustic excitations. Disturbing frequencies were identified as critical, compromising the reliability of the navigation system. In addition, the structure supporting these sensors could potentially amplify vibrations in the frequency band identified, exacerbating the problem.

The solution

To solve this problem, Metravib Engineering proposed a two-pronged technical approach. On the one hand, specific test benches were defined and deployed to assess the sensitivity of sensors to shock and vibration, enabling highly accurate measurements to be taken using laser vibrometers. Secondly, an experimental modal analysis of the support structure has been carried out to ensure that it does not contribute to amplifying vibrations in the frequency band identified as critical. All the tests and analyses carried out on this particularly sensitive project enabled us to improve the design of the overall system and ensure its reliability, thus meeting the expectations expressed by the end customer.