Week 8 Worm Gear Challenge

 

Transient structural Analysis of Worm Gear

Objective

To carry out a transient structural analysis on a worm gear model and to derive the equivalent elastic strain, equivalent stress, and total deformation of the model.

Material data

Figure. 1 shows the Structural steel's properties in Ansys Workbench engineering data. It was used as the Worm Gear model's material input as per Case 1.

Figure. 1 Structural steel Engineering data.

Model Geomentry

Figure. 2 shows the imported given Worm Gear model in the mechanical modular.

Figure. 2 Worm Gear model

 

Connections

Figure. 3 illustrates the connections between the Worm and the Gear. The Gear faces is assigned as the ‘Contact bodies’ and the Gear faces is assigned as the ‘Target bodies’ and the contact is defined as Frictionless.

Figure. 3 Frictionless - Wom to Gear

Joints

Figure. 4 illustrates Revolute Joint at the inner cylinderical face of Gear and Figure. 5 illustrates Revolute Joint at the inner cylinderical face of worm in which  rotational input will act

Figure. 4 Revolute - Ground to Gear

Figure. 5 Revolute - Ground to Worm

Meshing

Figure. 6 illustrates the model is Default meshed of a element size 1.5 mm with active Adaptive sizing and medium smoothing quality.

Figure. 6 Overall meshed model

Joint rotation

Figure. 7 illustrates The Joint Rotation on the inner surface of the worm which will rotate up to 2500⁰ in  25 steps as per Analysis setting. Figure. 8 illustrates 25 steps of the analysis and incremental rotation rate of worm.

Figure. 7 Joint - Rotation of the Joint with Gear

Figure. 8 steps with incremental rotation

Simulation Results

Equivalent Stress

 

Figure. 9 Equivalent Stress of Worm Gear model

Equivalent Elastic Strain

Figure. 10 Equivalent Elastic Strain of Worm Gear model

 

Total Deformation

Figure. 11 Total Deformation of Worm Gear model

Outcome of sumulation results

Parameters	Maximum	Minimum
Equivalent Stress	2327.9 MPa	2.0678e-6 MPa
Equivalent Elastic Strain	0.012319 mm	1.4523e-11 mm
Total Deformation	23.491 mm	0.87692 mm

 

Conclusion

• The result shows high equivalent stress in the Worm and Gear contact. Similarly for deformation and strain.
• Equivalent stress and equivalent elastic strain has the minimum value in the Gear body but the minimum deformation is in the contact region of Worm and Gear.
• Total rotation of Worm is 2500 degree axis of rotation which will cover half the Gear circumference.