×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Vibration/Impact causing falling /tripping

Vibration/Impact causing falling /tripping

Vibration/Impact causing falling /tripping

(OP)
Hi everybody,
I'm looking for data about which this issue.
For example, a person is standing on the a mobile crane chassis while at operation (the vehicle itself is stationary but the upper structure, boom etc. moving or rotating). What kind of vibration or sudden impact/movement will cause him to loose its stability and trip/fall.  
Thanks,
Ariky

RE: Vibration/Impact causing falling /tripping

I guess at this, but 0.1-0.2 g acceleration would cause to loose balance...maybe check nasa documents for human acceleration limits?

RE: Vibration/Impact causing falling /tripping

You will need a third derivative of displacement (jerk) rather than acceleration. Human beings can cope easily with relatively large accelerations, where they stumble is when that acceleration CHANGES.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

RE: Vibration/Impact causing falling /tripping

When I was at the University, we did a study for a security firm about the security relating a stepladder. We fixed a rigid cable to the stepladder while a guy (I was the lucky one) was standing on a step securely attached. We dropped different weights (fixed to the wire) at the same height until the guy falls. Unfortunately, I no longer know where this study is but maybe it can help you finding a solution to your problem. Of course, you guessed that knowing the weight and the height, you can evaluate the acceleration produced on the ladder to cause the guy to fall.

RE: Vibration/Impact causing falling /tripping


This article and/or the references at the end might be useful for google search buzzwords.

www.smpp.northwestern.edu/ ~smpp_pub/PattonPaiLeeEBR2000.pdf

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources