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My maximum velocity value is 33 mm/s but in ISO 10816-3 maximum allowable(zero to peak) is 5 mm/s.(*note: the location of applying harmonic load is on gearbox base plate)

no i didn't do real modal analysis, just in Ansys workbench. yeah i have seen mode shapes and they are not in critical area like motor base plate or compressor base. they are mostly in stiffeners or beams webs. i also perform a harmonic response analysis and deformations amplitude are way under...

yes 500 HZ and 700 HZ. yes it is, i think one of the reasons is that the oil tank is designed through the skid and tank walls are reducing total stiffness. but beside that, the beams(H-500) webs are also vibrating. so you say there is something wrong with my analysis? i attach my skid picture.

Hi. i have ran a modal analysis for an integral gear 3 stages compressor skid. the speeds of two rotors are 29121 and 42460 rpm respectively and motor speed is 3000 rpm. but the results was disappointing, there is almost 40 natural frequencies in the range of 10 percent lower and higher than...