Adams Machinery > Dialog Box - F1 Help > Sprocket - Mass

Sprocket - Mass

Machinery → Create Sprocket
By default, Adams View calculates the mass and inertia for a rigid body part based on the part's geometry and material type. The geometry defines the volume and the material type defines the density. The default material type for rigid bodies is steel.
You can change the material type used to calculate mass and inertia or simply specify the density of the part. If you do not want Adams View to calculate mass and inertia using a part's geometry, material type, or density, you can enter your own mass and moments of inertia.
It is possible to assign zero mass to a part whose six Degrees of freedom you constrain with respect to parts that do have mass. You should not assign a part zero mass, however. Any part that has zero mass and translational degrees of freedom can causes simulation failure (since a = F/m). Therefore, we recommend that you assign finite masses and inertias to all parts. In addition, a part without mass cannot have mass moments of inertia.
Learn about Methods for Calculating Mass Properties.
 
For the option
Do the following
Material (Sprocket1/Sprocket2)
Define Mass By
User Input
■If you do not want Adams View to calculate mass and inertia using a part's geometry, material type, or density, you can enter your own mass and moments of inertia.
Geometry and Density
■You can change the material type used to calculate mass and inertia or simply specify the density of the part.
Geometry and Material Type
■The geometry defines the volume and the material type defines the density.
If you select User Input, the following options will be displayed:
Mass
Enter the mass of the sprocket part.
The parts are located at the center of the sprocket, with the z-axis as the rotational axis.
Inertia
Ixx/Iyy/Izz
Enter the values that define the principal mass-inertia components of the sprocket part.
Ixy/Izx/Iyz
Enter the values that define the deviational (cross-product) mass-inertia components of the sprocket part.
If you select Geometry and Density, the following options will be displayed:
Density
Enter the density value.
If you select Geometry and Material Type, the following options will be displayed:
Material Type
Enter material type.
Defining the Contact Properties:
You define the sprocket interaction with the chain by specifying contact force parameters and the side of the chain on which the sprocket will be. You can measure the chain contact forces by creating requests (see Create/Modify Chain Link Request or Create/Modify Span Request for Roller and Silent Chain)

When calculating the contact force, Adams Machinery uses the predefined value: penetration depth of contact force, penetration_depth = 0.001 mm.
Stiffness
Enter the stiffness coefficient of the tooth-to-chain contact.
Scale Factor
Specify the scale factor of the tooth-to-chain contact force formulation. The scale factor is in length units.
Stiffness Exponent
Specify the stiffness exponent of the tooth-to-chain contact force formulation. The stiffness exponent is typically larger than 1.
Damping
Specify the damping coefficient of the tooth-to-chain contact force formulation. The damping is in force units * time units/length units.
Friction Enabled
Select one of the following:
■Yes - Lets you specify friction parameters as described next.
■No - Sets friction parameters to 0.
If you set Friction Enabled to ‘Yes’, Adams Machinery enables the following two options:
When calculating the contact friction, Adams Machinery uses the predefined values:
■Velocity at full static friction between Sprocket and chain, static_friction_slip_vel_chain = 100 mm/s
■Velocity at full dynamic friction between Sprocket and chain, dynamic_friction_transition_vel_chain = 200 mm/s
Static Friction Coefficient
Enter the coefficient of static friction of the tooth-to-chain contact.
Dynamic Friction Coefficient
Enter the coefficient of dynamic friction of the tooth-to-chain contact.