Week 8 Worm Gear Challenge

AIM:

• To perform a transient structural analysis on a worm gear assembly using ansys workbench.

PROCEDURE:

• Open ansys workbench.
• Dropdown transient structural analysis system and rename it as worm gear simulation.

• Import geometry by browsing to the file location.

• Edit the geometry using SpaceClaim.

• Cut the gear by half to bring the model within limits as below.

• Open ansys mechanical to set up the simulation.
• Rename the geometry.
• Create a frictionless contact between worm and gear as below.

• Create body-ground revolute joint as shown below.

• Create a body-ground revolute joint for gear.

• Under mesh switch on the adaptive sizing and change smoothening to medium and generate a mesh with an element size of 1mm.

• The above graph represents the mesh metrics which gives a clear picture of the element quality and type of elements used in the simulation.
• Now under analysis settings change the initial time step to 0.2 and minimum time step to 0.2 and the maximum time step to 0.5.
• Turn on the large deflection and change the weak springs to program-controlled. Change the output controls to yes expect for contact miscellaneous.

• Now change the number of time steps to 30 and select the steps from 2-50 and change the time step values as step-1 and turn on the carryover time.

• Insert joint load for worm as rotation with an increment of 70 degrees for each step.

• List the output required and simulate the model to obtain results.

RESULTS:

TOTAL DEFORMATION:

EQUIVALENT ELASTIC STRAIN:

EQUIVALENT STRESS:

CONCLUSIONS:

• Transient structural analysis on the worm gear assembly is performed successfully.
• During the simulation, the worm is moved until the end of the gear.
• The Equivalent stress, Equivalent elastic strain, and the total deformation in the model are obtained.