Structural noise analysis in a Data Centre with multiple generator sets
FEM modelling revealed how high-mass concrete structures act as 'structural loudspeakers'.
The challenge
The project involved the advanced analysis of structural noise generated by several generator sets installed in a Data Centre building, aiming to evaluate vibratory transmission to other areas of the building and technically justify the need for specific corrective measures.
In this type of critical infrastructure, where multiple high-power generator sets coexist on high-mass concrete plinths, the risk is not limited to direct airborne noise but extends to the structural transmission of vibrations through floor slabs, columns and load-bearing elements. Although the high structural mass might suggest favourable acoustic behaviour, the study demonstrated that, at certain excitation frequencies, these surfaces can behave as true sound radiators, acting as "structural loudspeakers" and amplifying noise beyond initial expectations.
The solution
A Finite Element Method (FEM) model was developed using COMSOL Multiphysics, enabling high-precision simulation of the dynamic interaction between the generator sets, concrete plinths and the building's overall structure. The model visualised eigenmodes, displacement amplitudes and vibratory propagation, identifying the critical frequencies where structural acoustic radiation was most significant.
The result
The results demonstrated that, without adequate isolation systems, vibratory energy could induce appreciable noise levels in technical rooms and sensitive areas of the building, even distant from the generator room. This evidence justified the incorporation of decoupling and damping solutions specifically designed to minimise structural transmission and prevent high-mass surfaces from acting as secondary noise emitters. An example of predictive acoustic engineering applied to high-criticality technological environments.
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