Project context:
SDTools regularly performs experimental modal analysis (EMA) in an oven to monitor temperature dependence.
One of the aims of these tests is to identify the material constitutive laws of various systems:
– 3D woven composites
– Tuned-mass dampers
– Polymeric materials
– …
To do so, it is necessary to excite the system in such a way as to make the locations of interest work.
Exploiting structural deformation modes, it is possible to achieve an optimum ratio between energy input and deformation amplitude.
🏠 First in-house solution:
We described in this previous post https://lnkd.in/e_Qf2-QC our in-house “hyper-cube” inertial base.
It was designed to get first base mode slightly above 600Hz but the bracket connections were weaker than expected and first base mode finally appeared around 500Hz.
A new system to be tested, with modes of interest in the [0-1000] Hz band, has been submitted to us ➡️ a stiffer base design is required !
🆕 Solution by Sud Prototype:
Based on an initial design and dimensioning carried out by SDTools, SUD PROTOTYPE built this new version:
– Industrial drawings from our FEM model and sketches
– Advices on the structure design to take feasibility into account
– Iterations during building to validate main design steps
🎯The final design is composed of:
👉 Stiff aluminum base (bolted for assembly, then welded at some location to ensure stiffness)
– 2 octagonal horizontal plates
– 2 vertical plates inside the base
– 8 vertical plates closing the box
👉4 removable (screwed) steel masses to tune the inertial base
🌟Successive iterations enabled us to converge efficiently on a design that met the initial specifications: first base mode is actually at 1kHz and we are all set to perform the test campaign.
🙏 We would like to thank BUSSO Alain from SUD PROTOTYPE for his support in building this inertial base.