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Thread: SERIOUS Vibration Insulation

  1. #1
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    SERIOUS Vibration Insulation

    Hi Gents,

    I need advice on how to insulate as best as possible, an In-Car PC and Hard Disk from extreme vibration...

    The PC will be installed in what would be the boot are of a large hatchback, with the rear seats removed, and replaced with a large subwoofer enclosure going right up to the B pillars...

    The PC will sit behind this "speaker wall" at the back of the car...

    So, how can I insulate the case and sensitive components from vibration? My thoughts so far...

    - Use a bootable Flash Media drive for O/S and programs

    - Use a 2.5" Laptop harddrive for storing movies/music etc

    - Make an birch-ply case for the motherboard and components

    - Sit this inside another, larger case, which will be lined with closed cell foam to give a snug fit


    Any other suggestions? I'm worried about scapping hard drives regularly or the OS crashing due to the loud speaker system in the car...

    Cheers
    Rich

  2. #2
    phc
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    Use what the military uses to isolate avionics from shock and vibration, Barry Mounts.

    Link: http://www.surplussales.com/Cab-Rack...hockmount.html

    (RPS) L22-BA-0.7

    I've used them in BattleBots for 3 years, work great and fairly cheap. They do take up room and you will need to get 4 of them.

  3. #3
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    That particular model says it supports 0.4-0.77 lbs each. So for 4, that's only a max of about 3.1lbs, right? Most computers weigh more than that... or am I misunderstanding what that weight rating represents?

  4. #4
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    theres multiple ones on that site. 20-30 lbs. 50+ etc.

    i made a case out of a old hp removable motherboard tray, glued it to a fiberglass mold and that was that. lol. my pci slots need to be secured somehow though. i gotta figure out how its going to work. i glued the harddrive to teh fiberglass. as well as the power supply.

    its been running like this since january with very minute problems. mostly because of the hard drive i used was a old crappy laptop drive. i have an exernal 3.5" HD pushing 160gb with 26000 mp3's no problem. the 3.5" is mounted flat to my floor. i had it standing up before but the place i mounted it now wont allow it to be mounted upright anymore.

    btw.. i have 2kW RMS feeding my stereo. so its not exactly like im running little bitty stereo system.
    Carputer HIFI car stereo project!
    [XXXXXXXXXXXXXXXXXXXXX-]
    95% COMPLETE! FINALIZING SOFTWARE PLATFORM!

    [XXXXXX--------------]
    30% COMPLETE! CAPUTER Version 2.0! Hardware FAILING! CARPUTER BLEW UP! AND NOW MONITOR TOO! WTF?!

  5. #5
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    Speaker vibration is nothing to hard drives and such.

  6. #6
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    Very helpful stuff Gents, nice one...

    It'll be a large system doing 155dB+ @ 40-50hz, 4 15" subs with around 12Kw RMS power meaning that a lot of protection is needed!

    I'm looking to run/boot the OS off flashmedia... Any reccomendations on the viability of this?

    I'd like to keep the 2.5" hard drive in a 2.5" -> 3.5" dampening case, then pop this 3.5" block into an external USB case for quick removal from the car...

    This does mean that another power supply would be needed to the case, is there a way around this at all?

    Cheers
    Rich

  7. #7
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    the external drive will need a power supply. why a laptop drive though?

    i believe what i have now can push 140+ db in my custom tuned vented enclosure. with 12kw rms id be more woried about supplying your computer with enough power without huge voltage drops. voltage drops will cause the computer to crash more so than the vibrations would.
    Carputer HIFI car stereo project!
    [XXXXXXXXXXXXXXXXXXXXX-]
    95% COMPLETE! FINALIZING SOFTWARE PLATFORM!

    [XXXXXX--------------]
    30% COMPLETE! CAPUTER Version 2.0! Hardware FAILING! CARPUTER BLEW UP! AND NOW MONITOR TOO! WTF?!

  8. #8
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    I was planning on using a Laptop drive as they are more tollerant of vibrations?

    Can external 2.5" drives not be powered by USB? This would make things a lot easier!

    Power supply isn't a problem, there will be an additional bank of batteries in the boot to keep voltage up...

    Cheers
    Rich

  9. #9
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    not exactly.. they both are quite similar when they are moving. but laptops may have higher tolerances when they are off. in either case, save yourself some money and get a bigger and faster drive. i use a seagate 7200rpm drive.

    try putting a capacitor in line with the computer power supply. that way it will keep the voltage going to teh computer at a somewhat constant rate instead of having spikes all over the place.
    Carputer HIFI car stereo project!
    [XXXXXXXXXXXXXXXXXXXXX-]
    95% COMPLETE! FINALIZING SOFTWARE PLATFORM!

    [XXXXXX--------------]
    30% COMPLETE! CAPUTER Version 2.0! Hardware FAILING! CARPUTER BLEW UP! AND NOW MONITOR TOO! WTF?!

  10. #10
    phc
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    Quote Originally Posted by WxGuy1
    That particular model says it supports 0.4-0.77 lbs each. So for 4, that's only a max of about 3.1lbs, right? Most computers weigh more than that... or am I misunderstanding what that weight rating represents?
    Your weight calculation is correct. Barrymounts are/were made in a wide range of weight ranges, if you look around you will be able to find a wider variety of parts.

    If you are in the Burbank area, you can go to Apex electronics, they have boxes of these things. http://www.apexelectronic.com/

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