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Thread: Reducing/Dampening Noise and Vibrations in a High impact system

  1. #1
    Associate Engineer
    Join Date
    Oct 2015
    Posts
    1

    Reducing/Dampening Noise and Vibrations in a High impact system

    Hello all,

    This is my first time logged onto this site and I was hoping to get some in acoustics andvibrations which I am not altogether familiar with. My background is Engineering Design and Analysis. I am currently working on a project to build a sort of automated air vortex cannon.

    If you arent familiar with an air vortex canon, it basically shoots a large volume of air out of a long nozzle at a high velocities by moving a well sealed bag or plate very fast. I have tried to recreate this effect with piston cylinder configuration design, and this works fairly well.

    The way my project works is that it uses a rack and pinion drive train system to draw back a piston platen through a tube. Behind the piston is a powerful spring and so when the piston reaches the end of its motion, the spring is released allowing the piston to fire at a high muzzle velocity.

    As you can imagine, I have to stop the piston at the end of travel.This is where I encounter problems. One of my specifications is to keep the entire system at a noise level below 60dB. However, because the speed is so fast, the impact is also really great causing the system to shoot up to an 80dB noise level.

    I have tried to use things such as sorbothane pads, rubber, foam, etc to act as dampers between the piston and stops during impact but because there is still a fair amount of metal in the system, it only goes so well in reducing the impact noise by about 5dB. I have thought about bulding enclosures but havent done any yet.

    I would be very appreciative if anyone here has some more experienc with building such and can point me in a better/right direction.

    Thanks for your time/

  2. #2
    Lead Engineer
    Join Date
    Aug 2013
    Location
    Houston TX USA
    Posts
    421
    Can you tell whether the impact noise is being transmitted primarily by the ejected air or the metal tubing section of the assembly?

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