Dynamic Simulation- Plot Power curve

Dynamic Simulation- Plot Power curve

admaiora
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Message 1 of 10

Dynamic Simulation- Plot Power curve

admaiora
Mentor
Mentor

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

Admaiora
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Message 2 of 10

JDMather
Consultant
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Accepted solution

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


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Message 3 of 10

admaiora
Mentor
Mentor

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
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Message 4 of 10

admaiora
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No ideas?

Admaiora
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Message 5 of 10

jan_priban
Alumni
Alumni
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):

DS_Power_model.png

 

Power definition:

DS_Power_definition.png

 

Power result curve:

DS_Power_results.png

 

Regards

 

Jan Priban

Message 6 of 10

admaiora
Mentor
Mentor

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
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Message 7 of 10

jan_priban
Alumni
Alumni

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

Page 168, Chapter 6

Message 8 of 10

wasim_younis
Enthusiast
Enthusiast
All versions of the book after 2012 versions have the new curve definition in chapter 6 Albeit slightly different page numbers.
Message 9 of 10

jan_priban
Alumni
Alumni

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

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Message 10 of 10

jan_priban
Alumni
Alumni

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

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