topic Re: Dynamic Simulation - request force to move element (sliding) in Inventor Forum

Dynamic Simulation - request force to move element (sliding)

bruno_milano — Wed, 27 Aug 2025 09:10:52 GMT

I need to apply a very simple dynamic law in Inventor's dynamic simulation.
An element slides on a guide.
Friction 0.4. weight 9.98 N
I want to calculate the force required to move the element by, say,, 100 mm.
I tried using a spatial or prismatic joint with imposed movement and Friction,

but the results don't seem correct.

Can you help me with this simple problem

Re: Dynamic Simulation - request force to move element (sliding)

89198826955 — Mon, 01 Sep 2025 18:46:01 GMT

1 When applying force, we indicate the time with which the force acts

2 we look at the position to which the body has deviated

3 if necessary, we add friction to the connection

(view in My Videos)

Re: Dynamic Simulation - request force to move element (sliding)

bruno_milano — Tue, 02 Sep 2025 14:14:57 GMT

I'm sorry, but I don't quite understand the example.
Why do I have to assign a force for the movement?
I'd like to know how many N are needed to move the slider along the guide I see in the video.
Should I use the unknown force command? Or the movement imposed on the joint?
Thanks.

Re: Dynamic Simulation - request force to move element (sliding)

89198826955 — Tue, 02 Sep 2025 19:39:18 GMT

if I remember mechanics correctly

you want to know the force, then you need to specify the speed at which the object will move

A = (m * v ^ 2) / 2

A = F * s

m*v^2 /2=F*s

F=(m*v^2/2)/s

The program needs to understand when the object will reach the end point

Re: Dynamic Simulation - request force to move element (sliding)

bruno_milano — Wed, 03 Sep 2025 08:15:51 GMT

I'll try to attach an example.
The Slide component slides with a prismatic joint in the Guide.
The Slide's weight is 264 N.
Friction: 0.4
I want to move the Slide from its current position to 900 mm.
If I use the classic formula F = Weight x Friction Factor, the result would be this:
F = 264 x 0.4
F = 105.6 N
This is the minimum force I need to move the Slide. Is this correct?
How can I get this result in Inventor's dynamic simulation?
Shouldn't the unknown force solve this problem?
Thanks.

Re: Dynamic Simulation - request force to move element (sliding)

89198826955 — Wed, 03 Sep 2025 11:45:49 GMT

you have received this result

Re: Dynamic Simulation - request force to move element (sliding)

bruno_milano — Wed, 03 Sep 2025 12:34:59 GMT

Yes, but I'm not sure this is the correct way to achieve this with Inventor.
Is your solution better?

Re: Dynamic Simulation - request force to move element (sliding)

89198826955 — Wed, 03 Sep 2025 13:03:16 GMT

I think this is not the right method

apply a force of 103 N and see how much the body moves

Re: Dynamic Simulation - request force to move element (sliding)

89198826955 — Wed, 03 Sep 2025 13:23:54 GMT

if we set the force: calculate the speed and the path

if we set the speed: calculate the force and the path

if we set the path: calculate the speed and the force

for a given time of 5s