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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 · Aviation · ASOMv10
Aircraft landing gear with bearing friction
A cylinder deploys and retracts the landing gear of an aircraft. ASOMv10 calculates the required cylinder force, including the friction in the revolute joints.
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The task
Friction forces that depend on the direction of motion
A cylinder deploys the landing gear outward from the center of the aircraft and retracts it again, viewed along the aircraft axis. The model applies during flight, that is, before touchdown. The task is to find the force the cylinder has to apply – including the friction in the revolute joints.
What ASOM shows here
- Coulomb joint friction in the revolute joints, defined by the friction coefficient μ and the pin diameter.
- A diagram compares the actuating force with and without friction, for deployment and retraction.
- The start and end positions can be changed quickly, and friction is still taken into account.
Your benefits
Include friction from the start
You see early on how much friction changes the required cylinder force – differently during deployment than during retraction.
Size the cylinder correctly
You know the required force for both directions before the cylinder is selected. More on force calculation
Friction at a glance
A diagram shows what friction costs – instead of separate calculations with and without friction. More on diagrams
Change positions without rebuilding
You check other start and end positions in the same model; if required, a motion generation synthesis holds the end position in place.
More examples
All example videos
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Hospital bed with spindle drives
Two drives that model spindle drives adjust the height and the foot section. ASOMv10 calculates drive and bearing forces in real time, with friction in all joints and guides.
3:03
Truck lift gate
Two hydraulic cylinders open the gate and raise and lower the platform. ASOMv10 combines the partial movements into one motion sequence and calculates the bearing forces with friction.
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