Vibration Dampening Material Suggestions

[ceulrich]

Hello All,
I have two power amps I built in Dissipante 4U boxes a few years ago. The front, sides and back seem to be well damped, but the top covers ring like a bell. Any suggestions for dampening material to use on these tops?

Cheers,
ceulrich

 

[DCE1198]

3M damping tape. Wonderful stuff!

https://www.ebay.com/itm/1758371587...43T7-pMm3HeDaZDInuedkor_Ti-FwazxoC3CgQAvD_BwE

Dan

 

[ceulrich]

Hello DCE1198, thanks for the suggestion, I will look into it.
Cheers,
ceulrich

 

[Havoc]

Ask for it in a car parts shop. They have self adhesive panels that look like some heavy rubber. This is made for dampening sheet metal surfaces in cars. You can cut it easily.

 

[Brijac]

Vibrofiltr or the like. Works wonders, cheap and doesn't stink. Most well equipped car shops should have this.

 

[altec9440]

I use a roll of recycled tires that are usually placed under the washing machines.
I stick pieces my computer cover with neopren glue (also everywhere in fact).
Very good ratio dampering vs cost

 

[Boden]

Where do you source that recycled tire roll?

 

[altec9440]

DIY stores. Use it also under microphone stand...

 

[Boden]

Is there a know manufacturer? This stuff looks like what I am looking for, but have not seen it over here in the regular diy stores. How wide are those rolls available?

 

[schiirrn]

What is the issue with an amplifier cover that rings? What excites the ringing?

 

[Boden]

Found it!

 

[altec9440]

May be you have some LM in Netherlands...

 

[Andersonix]

https://www.frostking.com/products/weatherstripping/mortite-caulking-cord

Rope caulk!

 

[Bas Horneman]

Best damper is weight. So if at all possible. Connect the top covers to the bottom in the middle to 'ground ie weight' via a rod/bolt. This will couple the weight of the device to the top. If not feasible because there are electronics parts in the way or because it will look too ugly. Glue lead to the inside of the top cover.

 

[planet10]

I use the extra foam gasket material that comes with some of the drivers i have come thru here.

dave

 

[Mark Tillotson]

Weight/mass doesn't damp, it just lowers the resonant frequency. Adding a strut between top and bottom is changing the resonant modes, raising the resonant frequecies. Damping involves dissipating mechanical energy as heat, usually using visco-elastic materials which self-heat when distorted.

 

[Bas Horneman]

I stand corrected.

 

[MrKlinky]

A general rule used in industry is that the mass of damping material should roughly equal the mass of the panel to be damped, usually stated in kg/m2 to obviate thickness calculations.

 

[Mark Tillotson]

But there's no physical basis for that rule - viscous friction isn't directly related to mass or density.

 

[ulogon]

Any suggestions for dampening material to use on these tops?

Since your chassis is very nice and apparently could also develop quite a bit of heat I think it deserves a material like butyl (sheet) which I'm a fan of.

From the Internet: "Butyl has very high impermeability to gases, ozone, ultraviolet light and weathering. Butyl also has high chemical resistance and is particularly good where high or low temperatures prevail".

Something like this automotive sound deadener, just as an example.


P. S.: to be used under the lid, not on top...