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For large civil engineering structures much larger shakers are used, which can have a mass of 100 [[kg]] and above, and are able to apply a force of many hundreds of [[newtons]]. Several types of shakers are common: rotating mass shakers, electrodynamic shakers, and electrohydraulic shakers. For rotating mass shakers, the force can be calculated by knowing the mass and the speed of rotation, while for electrodynamic shakers, the force can be obtained through a load cell or an accelerometer placed on the moving mass of the shaker. Shakers have an advantage over the impact hammer as they can supply more energy to a structure over a longer period of time. However, problems can also be introduced; shakers can influence the dynamic properties of the structure and can also increase the complexity of analysis due to [[window function|windowing]] errors. |
For large civil engineering structures much larger shakers are used, which can have a mass of 100 [[kg]] and above, and are able to apply a force of many hundreds of [[newtons]]. Several types of shakers are common: rotating mass shakers, electrodynamic shakers, and electrohydraulic shakers. For rotating mass shakers, the force can be calculated by knowing the mass and the speed of rotation, while for electrodynamic shakers, the force can be obtained through a load cell or an accelerometer placed on the moving mass of the shaker. Shakers have an advantage over the impact hammer as they can supply more energy to a structure over a longer period of time. However, problems can also be introduced; shakers can influence the dynamic properties of the structure and can also increase the complexity of analysis due to [[window function|windowing]] errors. |
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==External links== |
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*[http://www.mpihome.com/pdf/soa_structural_dynamics_testing.pdf Structural Dynamics Testing/Modal Analysis] |
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*[http://www.pcb.com/techsupport/tech_hammers.php Impact Hammer Selection Guide] |
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*[http://www.lmsintl.com/modal-analysis A Brief Introduction to Modal Analysis] |
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==See also== |
==See also== |
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*[[Modal Analysis]] |
*[[Modal Analysis]] |