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!

*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.

Jobs

Selecting appropriate damper

Selecting appropriate damper

(OP)
I've been a bit lost figuring out what damper I should be using for the front suspension I am designing. Right now I'm running a wheel rate of 60 lbf/in at the front with a ride frequency of 1.2254 Hz. The front is also supporting a sprung mass of 391.68 lbf. Comfort is the end requirement of the design where the car will be operating at city and highway speeds of around 60km/h and 100km/h.

From what I've been reading a damping ratio of about 0.2 is suitable for a passenger car to maximize comfort in bump. I am aware that just working with that damping ratio all throughout the force velocity curve is not ideal because the ride can be very uncomfortable at high velocities and I am also aware that the damping should be higher during rebound compared to bump. Currently I am trying to work towards a force velocity curve that has a similar profile as shown in the attachment I've uploaded. However, I am having difficulty determining how much more damping I want in rebound compared to bump as well as where I should have the split between high and low velocity.

Another thing that I'm concerned about is when I do actually finalize my desired force velocity curve, how can I select a damper on the market that will behave similarly to that curve? I've been looking around in catalogs but all they help you with is the sizing and choosing the appropriate damper for a particular model of vehicle and I don't believe manufacturers are willing to reveal their force velocity plots for their dampers because it may be confidential information. Any help would be appreciated! smile

RE: Selecting appropriate damper

There are proprietary methods for selecting damper sizes based on the usual inputs, but I don't think there are methods that a ride engineer would concede were worthwhile as more than first guess for developing force vs velocity curves, and certainly not valving.

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: Selecting appropriate damper

In the last millenium MG was apparently willing to list some settings for MGA Twin Cam's Armstrong dampers.
http://mgaguru.com/mgtech/books/tdb/tdtc_m_suspens...

So far I have not found the factory tools listed that might be used to check or adjust those dampers.

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


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