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Vibration Testing of Rearview Mirrors

m+p International UK Ltd News and PR from m+p International UK Ltd - Published 09 August 2019 m+p international’s dynamic signal analyzer is used to evaluate the performance of rearview mirrors during prototype development and in production.
Even unspectacular parts of the vehicle such as rearview mirrors have to be thoroughly tested. m+p internationalÂ’s noise and vibration analyzer is used in conjunction with National InstrumentsÂ’ CompactDAQ hardware to evaluate the performance of rearview mirrors during prototype development and in production. Testing is performed both in the laboratory and on a driven vehicle.

In the lab, the mirror assembly is mounted on a rigid test rig and subjected to excitation coming from a force hammer. Measurements of the frequency response function (FRF) of the mirror glass are made using m+p international's Impact Wizard, which provides facilities such as selection of data points/nodes, double impact detection/rejection, and visual measurement feedback to simplify and optimize data acquisition. Measurements are taken using a single three-axis accelerometer mounted at various points on the mirror in turn. The measured FRFs are analyzed by m+pÂ’s Advanced MDOF Wizard to calculate modal parameters: frequency, damping and mode shape. The results are also compared with a finite element analysis (FEA). Based on the results, the design of the mirrorÂ’s components can be tuned by small adjustments to the molding process and component shape.

Drive testing is performed on a vehicle driven around a test track at different speeds. Measurements of the frequency spectrum are taken using three-axis accelerometers mounted on each mirror.

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m+p internationalÂ’s analyzer enables us to perform our measurements accurately and in a repeatable manner with minimum fuss.

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