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Ideas for damping fluid borne noise?

Ideas for damping fluid borne noise?

Ideas for damping fluid borne noise?

(OP)
Looking at a refrigeration loop on a vehicle with a shut off valve. When the valve opens or closes, a clunk is heard by the passengers. Considering rubber damper for mounting, any ideas for in line fitting type suppression?

RE: Ideas for damping fluid borne noise?

The first thing that comes to mind for me is to possibly implement an inline insulated enclosure with either a plastic or metal case, with a suitable insuation material inside the case to dampen noise emissions...

the second thing that comes to mind was advice my dad gave me way back when I bought my first car - an old jalopy, he said "if it makes to much noise, just turn up the radio"

best of luck,

Paul

RE: Ideas for damping fluid borne noise?

The fluid velocity should be less than 15 feet per second. You can try increase the size of the tube to reduce the speed. Q = A . V where Q = mass flow rate (constant), A = cross sectional area (inside the tube) and V is the fluid velocity. Once you decrease the velocity by increasing the area then the noise should be recudeced (less turbulent).

RE: Ideas for damping fluid borne noise?

(OP)
Thank you Vibration Specialist. Unfortunately the tube length is about 12 feet and a larger tube diameter would be relatively costly. Since the initial posting numerous other solutions have been tried:
- internal valve changes to reduce the speed of opening.
- muffler upstream of valve in high pressure line.
- resilient hose in circuit to absorb fluid energy.
The best performing and most cost effective solution was a sharp edged orifice in the high pressure line just upstream of the shut off valve.

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