Design and testing challenges of space piezoelectric pointing mechanisms as mirror mass increases

Piezoelectric pointing mechanisms should not only perform high precision functions but should also be extremely resistant while remaining compact and lightweight to withstand the space launch requirements. Ensuring the vibration test success, still without using any launch lock, is a critical aspect of the projects.
This paper presents how the increase of the mechanism stroke and the payload size is affecting the capability of the devices to support vibrations during launch, and how the non-linear behaviour of the piezoelectric ceramic stiffness may affect the shaker’s drive control during qualification tests, which can lead to significant over-testing.
Finally, recommendations are provided that can be applied when selecting testing equipment, based on Cedrat Technologies experience.