Modal Test (Experimental modal analysis)

Resonance vibration is the cause or contributing factor of many of the problems caused by vibration in structures and machines. To better understand any structural vibration problems, the resonances of a structure need to be defined and measured. The most common way to do this is to determine the modal parameters of the structure. To determine these parameters, force is applied to the structure and the frequency response function (FRF) is collected from many points. The force input is made with a modal hammer or shaker, while responses are collected with accelerometers. By transferring and analyzing the data to the computer environment, the vibration patterns at the natural frequencies of the structure can be obtained and compared with the models created by the finite element method.

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