Hello everybody,
I want to simulate the constraint forces of two ball-bearings, transmitted by a rotational shaft.
I have a rotational shaft which is supported by two ball bearings (blue,simplified):
Furthermore I will have (multiple) external forces, attacking the shaft on different frames (e.g. Frame1 or Frame R). The Forces are three dimensonal (with x and y component) and ideally timevariant.
I have to know which forces are at work at each bearing. Those bearings are token to be fixed in their positions.
I allready build a Simscape Multibody Model, where I splitted the shaft into three parts and combined each of them with Weld Joints. At each of the weld Points I added an Revolute Joint to achieve the support of the ball bearings:
I imagine a result like in the traditional school exercises where you have to calculate the bearing-forces of a linear beam.
I sense the forces attacking the Revolute Joints, but the sensed forces does not match my expectations. For test reasons I apply a force (x=-1kN,y=z=0) orthogonal on the end of the shaft, as shown in following image:
Due to the balance of power and torque I expect that the bearings must attack with 2kN and -1kN.
Like calculated by the online calculator:
But the sensed Forces in Simscape are different: (~0.75kN and ~0.25kN)
Can anybody help me, to measure the correct forces or to correct my expectations if they are wrong.
Do I have to consider anything during the model building process if the force-transmission is getting more complicated (e.g. a force transmission to the shaft by a piston and a crank)
Thank you in advice.
