×
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

Hoisting Boundary Conditions

Hoisting Boundary Conditions

Hoisting Boundary Conditions

(OP)
Dear all,

can someone explain to me how to apply boundary conditions under a hositing load case with 4 lifting points...?? and why ??

Best regards.

RE: Hoisting Boundary Conditions

? please clarify ...

have you modelled something you're lifting (a pallet ?) which will be suspended at four points and you're unsure about the constraints for this ??

Quando Omni Flunkus Moritati

RE: Hoisting Boundary Conditions

(OP)
Hi,

Yes, In fact i am working on a dolly structure which will be effectively suspended at its four lifting points and i apply 1.1g in the vertical direction... I already worked on a three points lifting case but not with four.

Should i use a Cylindrical Coordinate system and fix one point in (XYZ), and the three others in Z (assuming that Z is the vertical axis)?


RE: Hoisting Boundary Conditions

i'd use rectangular co-ord system (or whatever you used to make the model ... you don't need a special co-ord system for constraints).

1) constrain Z at the four points (this resolves 3 equilibrium equations, yes?)

2) constrain X and Y at one point (this resolves 2 more) ... this is what you suggested by fixing one point

you also need one more, either ...
a) constrain X at a point offset in Y from 2), or
b) constrain Y at a point offset in X from 2).

clear as mud ?

Quando Omni Flunkus Moritati

RE: Hoisting Boundary Conditions

(OP)
hi,

i will try this and keep you in touch

thank you

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