Experimental modal analysis (EMA) is the powerful method in automotive development to confirm, validate and correct (model updating) simulation results of a finite element calculation (FE model, FEM). Designing components based on a finite element model is an efficient way of shortening development times. But the feasibility of the resulting structural dynamic models needs to be assessed. Consequently, it is essential to perform the experimental modal test on prototypes so as to validate the models.
Design right the first time - here Scanning Vibrometers from Polytec speed up the process significantly. Non-contact measurement means zero mass-loading, so they do not influence the vibrational characteristics. The FE-like spatial data resolution or point density allows for performing modal analysis for higher modes and meaningful MAC analyses. Simply import the measurement grid from your FE model into the PSV software to use the identical coordinate system instead of interpolation. The virtually unlimited measurement points on your structure result in high spatial resolution, unlike conventional tactile methods like with accelerometers. Achieve high data quality even overnight – with the fully automatic RoboVib® Structural Test Station.
Validating complex models accurately and without contact
The need to validate simulation models of complex mechanical structures has grown in importance for efficiency in the design process. This is especially true for non-linear structures (such as composite panels and jointed components) where it is critical to use an accurate full-field measurement method. This tutorial covers a how-to-guide and use-cases of Scanning Laser Doppler Vibrometry (SLDV) as a non-invasive technology to efficiently characterize critical mechanical structures. Read the full paper from the IMAC International Modal Analysis Conference.
Eichenberger J., Sauer J. (2022) Validating Complex Models Accurately and Without Contact Using Scanning Laser Doppler Vibrometry (SLDV). In: Di Maio D., Baqersad J. (eds) Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-76335-0_11