wierd question.. need help creating virbation resistant stand for a "whole body" vibration
wierd question.. need help creating virbation resistant stand for a "whole body" vibration
(OP)
first off I dont like the idea of the machine nor do I believe it works but I have been recruited to create something to dampen the vibration. Here are the specs, and max user weight 250lbs
Model: EOS 6600
Commercial Vibration type: Oscillating (seesaw)
Amplitude: 0-10 mm
Color: Silver / Gray
Time setting: 1 minute to 60 minutes / Increments of 1 minute
Speed: 1 Hz to 40Hz / Increments of 1 Hz
Mode: Digital / Analog / Auto
Pre Set Programs: 1-Stand Straight / 2-Knee bent / 3-Push up
Control Panel: Digital display / LED Lights
Load Capacity: Max: 450 Lbs.
Power: 1.5 HP / 120 Volt 60 Hz
Dimensions: Platform: 9” W x 24” L
Assembled: 30” W x 38” L x 52” H
Weight: Net: 160 Lbs. / Gross: 195 Lbs.
Here is what im thinking, not exact and havent done calculations yet but my worries are balance of machine when user steps on it. and height the "plate" will have to be off the floor for total weight of about 450lbs (machine and user total)
Ive attatched rough idea
Model: EOS 6600
Commercial Vibration type: Oscillating (seesaw)
Amplitude: 0-10 mm
Color: Silver / Gray
Time setting: 1 minute to 60 minutes / Increments of 1 minute
Speed: 1 Hz to 40Hz / Increments of 1 Hz
Mode: Digital / Analog / Auto
Pre Set Programs: 1-Stand Straight / 2-Knee bent / 3-Push up
Control Panel: Digital display / LED Lights
Load Capacity: Max: 450 Lbs.
Power: 1.5 HP / 120 Volt 60 Hz
Dimensions: Platform: 9” W x 24” L
Assembled: 30” W x 38” L x 52” H
Weight: Net: 160 Lbs. / Gross: 195 Lbs.
Here is what im thinking, not exact and havent done calculations yet but my worries are balance of machine when user steps on it. and height the "plate" will have to be off the floor for total weight of about 450lbs (machine and user total)
Ive attatched rough idea





RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
Yes a trampoline is probably quite a good approach, as an isolator. If you want to design it propelry you need to know what floor vibration is acceptable to the other occupants of the building.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
* I've heard it said e.g. strobes are prohibited to operate at those frequencies- it is in something like brain alpha-wave frequency range and can have quite unpleasant effect on humans: nausea, headaches, even epileptic fits in extreme cases
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
I would think a plate on "motor mounts", then submerge the plate in about 1000lbs of dry sand
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
Vibration "solutions" are a dime a dozen; the question is whether ANY of them will work within the confines of the overall operational requirements and constraints. Removing 40Hz vibrations is considerably different than removing 1Hz vibrations. Attenuating 1Hz vibrations may result in unacceptable sway, using conventional approaches.
One thing you must consider is that energy cannot be destroyed; the vibrational energy of the system MUST go SOMEWHERE. Your trampoline might reduce the vibration to the floor, but that may simply mean that your customer is going to riding a bucking bronco, AND potentially get injured getting on and off the system.
Putting everything on a memory foam mattress might be an alternate solution.
Nonetheless, until you have measurements and frequency response and power spectral densities, you ought to stop with the design and figure out the requirements.
TTFN
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RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
so what effect are you trying to accomplish ? it sounds like 10mm @ 40 Hz isn't it
i suspect it's more the 40 Hz rather than the 10 mm; can you drive the platform at a lower frequency ?
FWIW, i think trying to isolate the "end-user" with silicon pads isn't addressing the fundamental issue.
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
So, if we double the voltage, the abs will develop twice as fast...
TTFN
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RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
is it the amplitude = velocity (ie too fast ?) ?
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
I think you had better get a valid amplitude/ frequency spec first.
And then you could begin the isolation design.
You are looking at a 3 degree of system ( or maybe 2 if you lock the person to the output) which can be managed , given the guy is getting 14K for it.
Surprising they are selling the thing if floor vibration is such a problem.Or are they looking at a new design.
Or am I missing something?
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
As usual with specs of this nature, you cannot arbitrarily assume that the 10mm amplitude goes with the highest frequency. The power specification would not support that.
Again, you haven't indicated where or how this is to be used. Mass along is very effective at damping vibrations, so placing the machine on its own concrete pad, isolated from the rest of the flooring would be one approach that we would use for our vibration test equipment.
TTFN
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RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
To get a good solution, one needs to add a mass interface between the machine and the floor, adding another degree of freedom and use spring- dampers between that mass and the machine and to the floor.
Not easy or maybe not doable practically, but doable.
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
Walt
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
Walt
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: wierd question.. need help creating virbation resistant stand for a "whole body" vibration