Embedded Files
Stability Analysis
Stability Analysis
The given dimensions of the LEVO stand were used to determine the maximum allowable weight of the ARGOS screen assembly (which must be placed on the end of the LEVO arm without tipping over the whole stand).
Torque Analysis
Torque Analysis
This analysis examined the feasibility of the motors maintaining and rotating the system. Using the rated nominal torque of the DC motor and current CAD proportions as basis, it was determined that the current design would not supply enough torque without increasing the gear ratio or providing a counter weight to the system. Future analysis will include a factor of safety to account for losses due to gearing.
Internal Stress Analysis
Internal Stress Analysis
The final mechanical analysis is to determine if a 3D-printed PLA arm will be able to support the weight. The test case used is when the arm is perpendicular to the ground as that is the largest moment acting on it. The conclusion is that the cross-section would need to be at least 25 cubic centimeters which is a reasonable area. A FEM simulation will be run in the future to verify these results.
Spring Analysis
Spring Analysis
The movable screen will be supported by an arm, which will tilt up and down. In order to reduce strain on the motors, three different ways to balance out the torque on the arm were considered: a counterweight, a torsional spring, and a linear spring. The required weight of the counterweight, as well as the necessary spring constants, were derived from known values.
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