4:18
Joint friction
How much force does friction cost? With a pin diameter and a friction coefficient for each joint, you compare manual and joint forces with and without friction.
Example · Fittings · ASOM
Kinematics of a door closer
A door with a door closer is moved by hand. The example shows how ASOM calculates the manual forces with a deliberately simple model.
2:26
The task
Forces in an everyday mechanism
The example looks at opening and closing the door using the door handle and, at least when opening, also pushing directly on the door – with a shorter lever arm in that case. The task is to find the required manual forces.
What ASOM shows here
- Manual forces for opening and closing via the door handle and for pushing the door open directly.
- Joint friction simplified as constant friction torques, independent of the joint forces.
- The inner workings of the door closer as a black box: a programmable torque.
Your benefits
Know the manual forces before a prototype is built
You model only as much as the task requires and still see how much force the hand has to apply at the handle or on the door.
Check ease of operation
You see whether the door is easy enough to move, both at the handle and when pushed open. More on force calculation
Friction as needed
Constant friction torques are sufficient here; for greater accuracy, you calculate with force-dependent joint friction.
Bring in your own know-how
You model the behavior of your door closer with a script, without reproducing its inner workings. More on scripts
More examples
All example videos
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Have a similar task?
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