50 G's transportation loading???
50 G's transportation loading???
(OP)
Hello, I am analyzing the integrity of a plastic casing holding two 7lb batteries. The loading is 50-g's while it's standing on end, which is supposedly what it could see during transportation by truck, cross-country.
What I am having a hard time with is the 50-g's and how to account for the shocks and springs of the vehicle. If I use a hard surface below the plastic pack, there's no way it could survive 50-g's, nor could anything I would imagine.
Has anyone done an analysis dealing with transportation g-loads of this magnitude? Any help would be greatly appreciated!
Thanks,
Scott
What I am having a hard time with is the 50-g's and how to account for the shocks and springs of the vehicle. If I use a hard surface below the plastic pack, there's no way it could survive 50-g's, nor could anything I would imagine.
Has anyone done an analysis dealing with transportation g-loads of this magnitude? Any help would be greatly appreciated!
Thanks,
Scott





RE: 50 G's transportation loading???
Find out the origin of 50 g's. A more realistic and usual shock spec would be a sudden drop at some height.Then the container can be made sufficiently absorbent to safeguard the contents.
Vehicle transportation is usually more modest since there is enough shock absorbing capability that the driver will survive.
RE: 50 G's transportation loading???
TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering
www.bluetechnik.com
RE: 50 G's transportation loading???
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
RE: 50 G's transportation loading???
RE: 50 G's transportation loading???
TTFN
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RE: 50 G's transportation loading???
TTFN
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RE: 50 G's transportation loading???
Tobalcane
"If you avoid failure, you also avoid success."
RE: 50 G's transportation loading???
I see that as an entirely reasonable design assumption for something that actually needs to survive a truck ride.
RE: 50 G's transportation loading???
Compliance (springiness) will be your friend.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: 50 G's transportation loading???
Thanks again all.
RE: 50 G's transportation loading???
However, you have the part about increasing the dt correct.
just a thought,
Fe
RE: 50 G's transportation loading???
(12 - 15 G is the maximum the older astronauts went through on the end of their rockets. It's NOT normal truck transportation of ANY survivable accident or collision of the tractor-traqiler on rubber wheels.
However ..... It might be the drop-from-six-foot that a (stupid) employee does by letting go of the battery above a concrete floor.
The requirement then is that the outer case (doesn't leak!) survives a drop so no acid is splattered all over the floor and adjacent customers.
If so, ridges or compressable edges on thepalstic case would deform and prevent the case from splitting its corners apart. The battery internal might be destroyed, but the acid is contained.
--
Bottom line? find out WHY the requirement is written and WHAT the "condition" of the battery needs to be after the drop/collision/rocket launch.
RE: 50 G's transportation loading???
I vaguly recall some guy strapped into a rocket sled hitting ridiculous G forces. He blacked out but suffered no permanent injuries.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
RE: 50 G's transportation loading???
The man you speak of is John Stapp, he reached just a little over 40g's in the rocket chair. More info on it can be found at Fastest Man On Earth
RE: 50 G's transportation loading???
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
RE: 50 G's transportation loading???
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 50 G's transportation loading???
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: 50 G's transportation loading???
see procedures:
IV --> Transit Drop - more like an 800-lb gorilla's oopsies
V --> Crash Hazard - 75g 6 ms
VII --> Rail Impact - rail car impacts at 6.4, 9.7, 13 km/hr speeds.
TTFN
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RE: 50 G's transportation loading???
RE: 50 G's transportation loading???