Damping of Hydraulic Cylinders

1. On the damping of a hydraulic cylinder drive
2. Computing the damping coefficients of hydraulic cylinders

Hi Andrew,

I am not familiar with DS but, a pneumatic cylinder, because air is a compressible fluid, has natural damping. In hydraulics however, if damping is required, it must be achieved by other means.

Does your design require it?

I Googled +"hydraulic cylinder design" +damping

and got:

http://www.google.com/#hl=en&source=hp&q=%2B%22hydraulic+cylinder+design%22+%2Bdamping&aq=f&aqi=&oq=&fp=b36c7832dbb01be6

Looks like there's a lot of info there.

Mike

Mike,

DS uses the physical properties (of a 3D CAD model) associated with each part like mass, inertia matrix, and position of the mass center to calculate reaction forces from "rigid" moving bodies at "joints" under gravity and other applied forces (like hyd. cylinders). Once this info is known I can simulate the motion and export these forces to FEA for a linear static analysis. This is a good tool but it requires inputs, like damping, when representing a hyd. cylinder. What I am trying to avoid is plugging in a value for damping or check a range of values to see how they effect the output and make a decision based on small enough changes in the output. To answer you question, no. My design does not require damping but I need to input something if I wish to analyze this with Inventor.

I have used DS to model fun stuff like dice falling on a table or down stairs and impacts.

Here are some You tube examples that show you a little of what it can do:

http://www.youtube.com/watch?v=Fg3wxzfvw-Q

http://www.youtube.com/watch?v=R4Ui27FU2qM&feature=related

Thanks for the links. I will do a little more research.

Andrew

Hi Andrew,

Thanks for the feedback. That lets me know a little more about you and what you already know.

You might start with finding out what the damping input value range is. Are you to enter a value between 0 and 1 or what? Knowing the damping input value range, you must then find out what the maximum value really means. I don't know if this will be any help, but I wish you the best.

Mike

Having spent 25 + years trouble shooting, building, and repairing hydraulic systems I am unfamilair with the term "damping" Sorry to seem uninformed but..... what does this refer to ( I visited L.L. refered sites but they did not have a reference to the term)