×
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

How much Load will swing

How much Load will swing

How much Load will swing

(OP)
Load is hanged from a crane by a cable. Crane suddenly stops, hence,
load and cable behave as Pendulum. If I know length of cable and weight
of load, by what equation I can find how much further the load will swing?

RE: How much Load will swing

(OP)
I also know speed of crane

RE: How much Load will swing

You need to use conservation of energy.

Kineteic energy at crane stop = potential energy at top of swing. Look up your physics texts for this type of situation.

csd

RE: How much Load will swing

Answer #2:  If the crane operator is good, and here I mean more than competent, when the crane stops, the load will not
swing at all.

Mike McCann
McCann Engineering

RE: How much Load will swing

CSD72's approach will work it all cases of a sudden stop following a "steady state" horizontal movement.

If the weight's post-stop pendulum motion is going to be small enough, your problem can be treated as standard simple harmonic motion:
displacement = x = a*sin(wt)
and
velocity = x' = aw*cos(wt)

For a pendulum with small displacements, w = sqrt(g/L).
At the time the crane stops moving, t=0 and
x' = crane's previous travel velocity.
Hence solve the velocity equation for "a", which is the answer you seek.

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