For the option: | Do the following: |
|---|---|
Gear Force Name | Enter the name of the simplified worm gear force element. |
Worm | Enter the name of the Worm. |
Worm Wheel | Enter the name of the Worm Wheel. |
Property File | You can reference to available property file to specify input parameters for gear and force. |
Contact Stiffness | Enter a value for the stiffness coefficient of the gear-to-gear contact. Note: The stiffness coefficient should always be the translational stiffness, that is, with units Force/Length. To get a full description of all contact parameters please refer to the online help for the IMPACT function. |
Damping Ratio | Enter a value for the damping ratio of the gear-to-gear contact. The resulting damping in the gear-to-gear contact will be: Contact Damping = Damping Ratio * Contact Stiffness The contact damping is always expressed be the translational damping, that is, with units Force-Time/Length, regardless if the backlash is measured as an angle or a length. The damping will be converted to appropriate units in the machinery solver code. |
Sharpness Factor | Sharpness factor of the backlash. Controls how sharp the transition is between the lash region with zero forces and the stiff region. |
Static Friction Coefficient | Specifies the coefficient of friction at which the transition between static friction and dynamic friction starts. |
Static Friction Velocity | Specifies the relative sliding velocity at which the transition between static friction and dynamic friction starts. |
Dynamic Friction Coeff. | Specifies the coefficient of friction at a contact point when the slip velocity is larger than the Dynamic Friction Velocity. |
Dynamic Friction Velocity | Specifies the relative sliding velocity at which the transition between static friction and dynamic friction ends. At sliding velocities higher than the Dynamic Friction Velocity, the Dynamic Friction Coefficient will be used. |
Backlash Type | Select if the Backlash should be entered as an Angle or as a Length. |
Backlash Angle | Enter a value for the backlash between the gears. The backlash is the total angle, that is, one tooth of Gear 1 is able to move half the backlash angle in either direction before contact with a tooth at Gear 2. |
Backlash Length | Enter a value for the backlash between the gears. The backlash is the total length, that is, one tooth of Gear 1 is able to move half the backlash length in either direction before contact with a tooth at Gear 2. The backlash length is at the Gear 1 base circle. |
Backlash Smoothing Time | Time for ramping up back lash value from zero to its entered value. This smoothing functionality can be useful in order to reduce initial transients in the simulations. Setting value to zero deactivate the smoothing functionality. |