×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Elevator Machine Reaction Force

Elevator Machine Reaction Force

Elevator Machine Reaction Force

(OP)
Here is a typical block up elevator machine arrangement with car and counterweight. The car is supported by cables that run over the driving machine sheave, onto a deflector sheave (frictionless) and then down to the counterweight. I am trying to find the most accurate way to analyze the reaction forces at the base of the block up assembly (red) acting on the supporting beam (blue). Obviously the car and counterweight cause tension in the cables that travel over both sheaves - where should this tension be applied? A coworker says I can simply idealize the cable tension as a point load directly on the blue beam at the locations they pass the supporting beam.

My instinct says this isnt the proper way to analyze this. I think I need to start by figuring out the reaction forces of the machine and deflector sheave onto the red beam they are both mounted to. However, I run into the problem that the cable tension is unequal from the car side to the counterweight side. I believe the cable tension on either side of the deflector sheave is equal, but the angle of the rope causes a force downward and towards the drive sheave on the deflector. How should I be analyzing the drive sheave? Am I overthinking this?

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close