I need to mount an electrodynamic shaker to the floor, I need to find the mass of the concrete under a T plate so as to stabilize the shaker. It has a max force of 6000-8000lb, 200 “g” shock, 3in displacement, and lastly, it has load support of 800lbs.

enter image description here

  • 1
    $\begingroup$ Have you considered asking the manufacturer? T-Plate attachment and concrete support are probably important too. $\endgroup$
    – Jim Clark
    Commented Jun 22, 2021 at 19:58
  • $\begingroup$ put it on a scale? $\endgroup$
    – Tiger Guy
    Commented Jun 23, 2021 at 1:00
  • $\begingroup$ What is "lb" stand for, force or mass? You need to indicate the direction of vibration and displacement. Also, If it is motor-driven, what is the operating frequency. $\endgroup$
    – r13
    Commented Jun 24, 2021 at 14:05

1 Answer 1


Contacting the manufacturer is a good idea. The mounting and safety considerations will depend on the device design. If you can not get this information, I recommend to post a real photo of the device and as much information as you can; mounting, power input, etc.

200g acceleration of 800lbs is 160,000lbf or an instantaneous 80Ton. Not sure what the floor thickness is at your facility, but you are going to have a hard time not damaging the floor with a direct connection, let alone reducing transmitted vibrations. In addition to being a nuisance, vibrations can damage the building structure and items within.

A better plan than direct mounting is to mount the device to a large mass like concrete, but then have something flexible between that concrete mass and the floor. That way, when the 800lbs goes up at 200g, the 8000lbs of concrete only accelerates at 20g and that motion is absorbed by a suspension system. You would need to size it properly for the mass, but an air ride suspension system kit might be a good solution.

Remember to use vibration resistant fastening methods (welds, cotter pin bolts, etc). If the system is to operate unattended, a floor mounted vibration kill switch would be a good idea if something were to go wrong.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.