Dynamic Simulation- Plot Power curve

[admaiora]

Hi,

In dynamic simulation we can plot positions, speed, acceleration, forces,etc.

For example a simple cylinder hydraulic.

I can plot the driving force (using imposed motion) during the time.

I would like to plot a power curve, is there any chance? I have tried a User variable, but with no success.

Any idea? Thanks

[JDMather · Accepted solution]

The Wasim Younis book has plotting of Power curve one of the exercises (I think with piston/crank problem). 

[admaiora]

Thank you @JDMather !

I have checked right now and (racing car rod?) and no power curve, just torque. Quite near, but that is a quite specific case.

[admaiora]

No ideas?

[jan_priban · Accepted solution]

Hi,

As Jeffrey Mather pointed: If you have Wasim Younis book "Up and Running with Autodesk Inventor Professional" book, there is definition of New Curve, page 168, Chapter 6.

Based on mechanical basics, power is defined as W/t but also as F*v (Force * velocity). Dynamic Simulation calculates imposed force and joint velocity, so POWER can be defined using these 2 variable.

Basic sample setup I user for Power definition

Model (Prismatic / sliding box):

Power definition:

Power result curve:

Regards

Jan Priban

[admaiora]

Hi, Maybe I have an old version of the book, but I am strugglin to find that.

Is it in the crack//piston chapter?

What version is your book?

Thanks!!

[admaiora]

Hi, Maybe I have an old version of the book, but I am strugglin to find that.

Is it in the crack//piston chapter?

What version is your book?

Thanks!!

[jan_priban]

The book is: Up and Running with Autodesk Inventor Professional 2017 - Part 2 - Dynamic Simulation

Page 168, Chapter 6

[wasim_younis]

All versions of the book after 2012 versions have the new curve definition in chapter 6 Albeit slightly different page numbers.

[jan_priban]

Hi @admaiora (Matteo Elia Stagnaro),

I wanted to delete my previous post, but this forum does not allow deletion. I am still working on prove of DS experiment, but so far, I have a doubt. Expression P = F x v can be used only when F = const, not in general cases when F is changing during time / movement, means P <> F x v for F <> const. Right know I think DS can't plot power curve as imposed force x velocity. I will you keep you posted.

Regards

Jan Priban

[jan_priban]

Talking to my colleague / friend they are both PhD ...

Power can be calculated as P = F * v where F is immediate force in time and v is immediate velocity in time. So my first post was correct. P = F * v. So Dynamic Simulation can calculate power as imposed force * velocity

Regards

Jan Priban