PBEAR dialog box (Simcenter Nastran)

Common options

Physical Property Table
Name	Defines the name of the physical property table.
Label	Specifies a unique numerical identifier for the physical property table.
Properties
Field Independent Domains	Controls how you define the stiffness or damping values.Select Rotor Speed to specify constant stiffness, viscous damping, or inertia, or to specify stiffness, viscous damping, or inertia as a function of rotor speed.Relative Displacement and Rotor Speed to specify constant stiffness, viscous damping, or inertia, or to specify stiffness, viscous damping, or inertia as a function of rotor speed and relative displacement. Relative displacement is the displacement between the two coincident grids used to define the CBEAR connection.Relative Force and Rotor Speed to specify constant stiffness, viscous damping, or inertia, or to specify stiffness, viscous damping, or inertia as a function of rotor speed and force carried through the CBEAR connection. The force is calculated from the relative displacement.

Stiffness Matrix, Viscous Damping Matrix, or Mass Matrix tabs

Each of the following options correspond to a field in the PBEAR bulk entry. For detailed information on the following options, see the PBEAR bulk entry.

For information on the ways that you can define TXX, TXY, TYX, TYY, TXZ, TYZ, TZX, TZY, TZZ, RXRX, RXRY, RYRX, and RYRY, see Additional magnitude options.

Radial Translation
TXX	Specifies the bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the radial X-direction to the force in the radial X-direction.
TXY	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the radial Y-direction to the force in the radial X-direction.
TYX	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the radial X-direction to the force in the radial Y-direction.
TYY	Specifies the bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the radial Y-direction to the force in the radial Y-direction.
Nominal Relative Displacement (NOMVAL1)	Appears when Field Independent Domains is set to Relative Displacement and Rotor Speed.Specifies the relative displacement that Simcenter Nastran uses to compute the bearing stiffness, viscous damping, or inertia.
Nominal Relative Force (NOMVAL1)	Appears when Field Independent Domains is set to Relative Force and Rotor Speed.Specifies the force that Simcenter Nastran uses to compute the bearing stiffness, viscous damping, or inertia.
Axial Translation
TXZ	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the axial Z-direction to the force in the radial X-direction.
TYZ	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the axial Z-direction to the force in the radial Y-direction.
TZX	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the radial X-direction to the force in the axial Z-direction.
TZY	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the radial Y-direction to the force in the axial X-direction.
TZZ	Specifies the bearing stiffness, viscous damping, or inertia that relates relative displacement, velocity, or acceleration in the axial Z-direction to the force in the axial Z-direction.
Nominal Relative Displacement (NOMVAL2)	Appears when Field Independent Domains is set to Relative Displacement and Rotor Speed.Specifies the relative displacement that Simcenter Nastran uses to compute the bearing stiffness, viscous damping, or inertia.
Nominal Relative Force (NOMVAL2)	Appears when Field Independent Domains is set to Relative Force and Rotor Speed.Specifies the force that Simcenter Nastran uses to compute the bearing stiffness, viscous damping, or inertia.
Radial Rotation
RXRX	Specifies the bearing stiffness, viscous damping, or inertia that relates relative rotation, rotational velocity, or rotational acceleration about the radial X-direction to the relative moment about the radial X-direction.
RXRY	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative rotation, rotational velocity, or rotational acceleration about the radial Y-direction to the relative moment about the radial X-direction.
RYRX	Specifies the coupled bearing stiffness, viscous damping, or inertia that relates relative rotation, rotational velocity, or rotational acceleration about the radial X-direction to the relative moment about the radial Y-direction.
RYRY	Specifies the bearing stiffness, viscous damping, or inertia that relates relative rotation, rotational velocity, or rotational acceleration about the radial Y-direction to the relative moment about the radial Y-direction.
Nominal Relative Rotation (NOMVAL3)	Appears when Field Independent Domains is set to Relative Displacement and Rotor Speed.Specifies the relative rotation that Simcenter Nastran uses to compute the bearing stiffness, viscous damping, or inertia.
Nominal Relative Moment (NOMVAL3)	Appears when Field Independent Domains is set to Relative Force and Rotor Speed.Specifies the relative moment that Simcenter Nastran uses to compute the bearing stiffness, viscous damping, or inertia.

Composite Coefficients

The options on the Composite Coefficients tab are available when Field Independent Domains is set to Relative Displacement and Rotor Speed or Relative Force and Rotor Speed.

Each of the following options correspond to a field in the PBEAR bulk entry. For detailed information on the following options, see the PBEAR bulk entry.

Radial Translation
C1C1ZD10	When Field Independent Domains is set to Relative Displacement and Rotor Speed, specifies the coefficients that define how Simcenter Nastran combines the radial and axial relative displacements, and the composite radial relative preload displacement (D10) to determine the composite radial relative displacement.When Field Independent Domains is set to Relative Force and Rotor Speed, specifies the coefficients that define how Simcenter Nastran combines the radial and axial forces, and the composite radial preload force (D10) to determine the composite radial force.
Axial Translation
C2C2ZD20	When Field Independent Domains is set to Relative Displacement and Rotor Speed, specifies the coefficients that define how Simcenter Nastran combines the radial and axial relative displacements, and the composite axial preload displacement (D20) to determine the composite axial relative displacement.When Field Independent Domains is set to Relative Force and Rotor Speed, specifies the coefficients that define how Simcenter Nastran combines the radial and axial forces, and the composite axial preload force (D20) to determine the composite axial force.
Radial Rotation
C3C3ZD30	When Field Independent Domains is set to Relative Displacement and Rotor Speed, specifies the coefficients that define how Simcenter Nastran combines the radial and axial relative displacements, and the composite rotational relative preload displacement (D30) to determine the composite rotational relative displacement.When Field Independent Domains is set to Relative Force and Rotor Speed, specifies the coefficients that define how Simcenter Nastran combines the radial and axial forces, and the composite rotational preload force (D30) to determine the composite rotational force.

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PBEAR dialog box (Simcenter Nastran), Simcenter 3D 2021.1 Series

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