×
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

Powertrain Mount Reaction Forces

Powertrain Mount Reaction Forces

Powertrain Mount Reaction Forces

(OP)
Good Afternoon All,
I am new to the site and new to the world of engineering (more of a math go-er). I am working on calculating the reaction forces of a 3 or 4 powertrain mount system. If I apply a load on the CG in the x,y,z direction how is it possible to calculate the reaction forces (x,y,z) for the different mounts? I know the mass of the system, the stiffness, orientations (euler angles) and positions of the mounts and have already worked on calculating the natural frequencies and kinetic energy of the system but I am hung up on how to do the reaction forces and it seems so simple to do. I know the equation is Mx..+Kx=f(x) where M is the mass matrix (I have a 6x6 matrix) x.. is acceleration, K is the global stiffness (also have a 6x6) and f(x) is the reaction force.
Any theory or advice on where to go would be greatly appreciated.
Thanks so much.

RE: Powertrain Mount Reaction Forces

3 mounts is easy, if you ignore stiffnesses and other such side issues. First year statics.

4 mounts less so, as there is one redundancy in the vertical direction. This means you need to consider the various stiffnesses of the mounts.

If you actually want to do the job properly then you need to be very sure of the location of the engine mounts if there are 4 of them.

Roll restrictors and the like usually don't matter but they could add further constraints.

Cheers

Greg Locock


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

RE: Powertrain Mount Reaction Forces

i would get a basic FEA package to do this. unless you are wanting to do it by hand as an academic exercise

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