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

Multiple springs and masses system

Multiple springs and masses system

Multiple springs and masses system

I have this mass spring system consisting of 4 masses and 4 springs. It is preloaded, and I want to know the velocity on the "free" side of the system at a certain point. Also would be interesting to know the remaining forces when that mass hit the end stop...

RE: Multiple springs and masses system

Well, for starters, with no damping you'll have infinite displacement and velocity at the resonant frequencies.

RE: Multiple springs and masses system

@OP Can you solve it for a single spring mass system? If not then you'd better figure out how to do that.

@Brian, I think it is under a static precompression so in all probability we are just talking about the initial acceleration of the system once the trigger is released. The dynamic deflection from the zero point cannot exceed the static deflection, I think.


Greg Locock

New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: Multiple springs and masses system

solving in time or frequency domain?
if you have the response (displacement) of a mass i d_mi(t) then v_mi(t) =d_mi(t) dt, etc

RE: Multiple springs and masses system

For my application, the forces are released before a full endstop, so time?!

RE: Multiple springs and masses system

OK, I have the M and the K matrices already defined, I just need a little help refreshing my memory from university... BC's: x_i for al masses, v_i and a_i = 0. Also final position of one of the masses...

RE: Multiple springs and masses system

Are you looking for analytical solution or numerical? I suggest numerical - the solution is pretty easy and the setup depends mostly on how you want to numerically solve it.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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