Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Coupling....

Posted by pburant (A) on June 3, 2004 at 12:37:40

In Reply to: Re: Suspending a component is not sufficient... posted by Tim G. on June 3, 2004 at 12:20:15:

Attention to vertical coupling is very important, even in cases where vertical isolation will be implemented. Due to gravity, we can't truly float our components, therefore our gear must be coupled to the ground in some manner, even if thru a vertical isolation device - you must couple your gear to the device, and the device to the rack or floor.

If you're going to go the string suspension route, then I think you have the right idea in using something like cones to couple the component to the suspension cradle. You should also make the cradle as light and stiff as possible. Aircraft (7075) aluminum would be the best material (short of carbon fiber), next would be 6061 T6 aluminum. If you're going to use steel, you may want to consider swiss-cheesing it by drilling lots of holes in it - it's definitely more important for it to be stiff than to be light - you'll need to find the best compromise within your budget. You should also consider damping the structure if you make it out of steel (Mortite, or rope caulk, works well). Even better than a metal cradle, however, would be some type of constrained layer platform. As Barry Kohan hit on earlier in this thread, a platform would help out with some of the other types of vibration that the string won't addrress.

You will also want to pay attention to how you mount the string to both the support and cradle/platform. Minimizing static friction is very important in maximizing the effectiveness of any spring/pendulum suspension. As I stated ealier, if the suspension isn't put into motion, it's no more than an elaborate coupler....

Have fun,
Pete

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