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## Main Question or Discussion Point

I am performing Modal analysis on a fairly simple structure (a square aluminum rod with some pillars attached to the top of it) and need to get some basic modal analysis results. Making a solid aluminum piece would be rather expensive and time consuming to design and then mill out, so the alternative would be to simply glue the pillars on to the rod. We just need to be able to see the basic vibration modes of this system (only up to about 8000 Hz).

one unit cell of this rod is a cube of dimensions (in cm) 6x6x6 with a pillar of 1.5x1.5x3 on top, this structure would be repeated 15 times (based on current design specifications)

How adversely would a glued structure affect the resultant FRF graph compared to the real solid piece FRF graph. Would it be worth the time and money to produce the solid piece? or will the glued version give us usable results?

Note: We are only doing this for research purposes, the glue we select will be simply for its vibrational properties. We are NOT looking for strength variables of any kind. The point in this experiment is to observe the bending and torsional modes of this system as a function of system response amplitude (in Db) versus frequency (in Hz)

one unit cell of this rod is a cube of dimensions (in cm) 6x6x6 with a pillar of 1.5x1.5x3 on top, this structure would be repeated 15 times (based on current design specifications)

How adversely would a glued structure affect the resultant FRF graph compared to the real solid piece FRF graph. Would it be worth the time and money to produce the solid piece? or will the glued version give us usable results?

Note: We are only doing this for research purposes, the glue we select will be simply for its vibrational properties. We are NOT looking for strength variables of any kind. The point in this experiment is to observe the bending and torsional modes of this system as a function of system response amplitude (in Db) versus frequency (in Hz)

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