topic Re: Dynamic Simulation- Plot Power curve in Inventor Forum

Dynamic Simulation- Plot Power curve

admaiora — Sun, 17 Jul 2022 13:20:25 GMT

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

Re: Dynamic Simulation- Plot Power curve

JDMather — Sun, 17 Jul 2022 17:41:47 GMT

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

Re: Dynamic Simulation- Plot Power curve

admaiora — Mon, 18 Jul 2022 08:04:58 GMT

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.

Re: Dynamic Simulation- Plot Power curve

admaiora — Mon, 25 Jul 2022 09:49:06 GMT

No ideas?

Re: Dynamic Simulation- Plot Power curve

jan_priban — Thu, 28 Jul 2022 10:21:08 GMT

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

Re: Dynamic Simulation- Plot Power curve

admaiora — Thu, 28 Jul 2022 10:19:43 GMT

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!!

Re: Dynamic Simulation- Plot Power curve

jan_priban — Thu, 28 Jul 2022 10:22:32 GMT

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

Page 168, Chapter 6

Re: Dynamic Simulation- Plot Power curve

wasim_younis — Mon, 01 Aug 2022 01:10:17 GMT

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

Re: Dynamic Simulation- Plot Power curve

jan_priban — Wed, 03 Aug 2022 14:15:23 GMT

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

Re: Dynamic Simulation- Plot Power curve

jan_priban — Thu, 11 Aug 2022 12:41:18 GMT

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