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MbDFEM Simulation of the L-Shaped Pendulum.

Problem Description.

In the Oblique Pin Pendulum example, the center of mass of the pendulum moves along the middle plane of the hinge, which results in a constant hinge joint torque. In this example, a protrusion is added to the pendulum, which places its center of mass offset from the hinge middle-plane, and results in a variable joint torque. The dimensions of the pin and its material properties remain the same as in the Compound Pendulum example.

The two videos below show the isometric-view of the assembly. The Earth's gravity points to global negative Y-axis. The left video shows the hinge joint force and torque in the reference frame of the pendulum. The video on the right shows the hinge joint force and torque in the reference frame of the pin.

The hinge joint axis is parallel to the global Z-axis, so the hinge only experiences side-forces, while the axis-forces are zero.

Next: FEM Loads and d'Alembert Principle.