# Request for steps or procedure to simulate meshed spur/helical gears various static and dynamic analysis

**URL:** <https://prepomax.discourse.group/t/request-for-steps-or-procedure-to-simulate-meshed-spur-helical-gears-various-static-and-dynamic-analysis/487>\
**Category:** General Questions\
**Created:** [October 31, 2022, 6:31am UTC](https://prepomax.discourse.group/t/request-for-steps-or-procedure-to-simulate-meshed-spur-helical-gears-various-static-and-dynamic-analysis/487 "2022-10-31T06:31:31Z")\
**Posts on this page:** 1\
**Showing post:** 19

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [November 4, 2022, 9:46am UTC](https://prepomax.discourse.group/t/request-for-steps-or-procedure-to-simulate-meshed-spur-helical-gears-various-static-and-dynamic-analysis/487/19 "2022-11-04T09:46:02Z")

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If you want to simulate torque applied to the gear, you can also do it using a rigid body constraint. This approach will be easier. Just create a reference point in the middle of the gear, select it for rigid body constraint, pick a face or an edge to which the load will be transferred and define Moment load assigned to the reference point. Like in this tutorial: [https://youtu.be/2upPxL45OZg](https://youtu.be/2upPxL45OZg)

When it comes to the analysis with contact, I would do it differently, using the procedure described here:

> [@Request: Gear contact simulation tutorial](https://prepomax.discourse.group/t/request-gear-contact-simulation-tutorial/117/2):
>
> - try to do it in 2D (plane stress) if possible - meshing will be much easier
> - apply local mesh refinement to the contacting teeth
> - define a contact pair for all surfaces of the teeth that may come into contact
> - apply rigid body constraint to the hub of each gear
> - fix one gear (via this rigid body constraint)
> - apply rotation or torque to the other gear (again via the rigid body constraint)

You already have refined mesh and contact pair so just consider running a plane stress analysis for a start and use rigid body constraints (necessary to operate on rotational degrees of freedom for solid elements) to apply BCs to gears - you can make one gear free to rotate and apply angle of rotation to another gear. Torque will be worse for convergence.

Here’s a modified version of your model:

> **[Pinion Gear 20 teeth + Driven Gear 63 teeth - with backlash- Load to be...](https://www.dropbox.com/s/l6v6ut8m7u1n1l8/Pinion%20Gear%2020%20teeth%20%2B%20Driven%20Gear%2063%20teeth%20-%20with%20backlash-%20Load%20to%20be%20transferred%2030Nm%20-%20Fea%20Analysis%20-%20example%202%20-%20mod.pmx?dl=0)**
>
> Shared with Dropbox

In addition to the aforementioned suggestions I made the following changes:

- removed unnecessary faces from contact pair
- replaced two sections with one since you have a single material
- removed tie constraint (not needed here)
- removed centrifugal load (not necessary when actual rotation is simulated)

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