Mass Trim

Purpose:

This interface is for modifying model or part mass properties to obtain desired mass, center of mass, and inertia.

Function:

Current : Measure the current mass, center of mass, and inertia properties (which serve as starting reference values).

Desired : Assign desired mass properties using one of two methods: (1) add *ELEMENT_MASS to selected nodes or (2) convert *PART to *PART_INERTIA (if necessary) and assign specified properties.

Sample:

no sample.

Dialog:

Current

  • Mass : Desired mass.

  • X : X-coordinate for current center of gravity.

  • Y : Y-coordinate for current center of gravity.

  • Z : Z-coordinate for current center of gravity.

  • Ixx : Current Ixx component for mass moment of inertia.

  • Iyy : Current Iyy component for mass moment of inertia.

  • Izz: Current Izz component for mass moment of inertia.

  • Ixy : Current Ixy component for mass moment of inertia.

  • Iyz : Current Iyz component for mass moment of inertia.

  • Ixz : Current Ixz component for mass moment of inertia.

  • Compute : Automatically fill in mass properties for VISIBLE entities.

  • Apply : Apply mass trim.

  • Reject : Reject mass trim.

  • Accept : Accept mass trim.

  • Done : Exit mass trim interface.

Desired

  • *PART_INERITA : Select ONE rigid body part to use as *PART_INERTIA to obtain desired properties.

  • *ELEMENT_MASS : Select nodes to generate *ELEMENT_MASS on, trying to obtain desired properties.

  • Include : Are mass and inertia for the selected part included in Current properties?

  • PID : Optionally enter part ID for generated mass elements.

  • MASS : Desired mass.

  • C.o.M : Optionally modify Center of Mass.

  • Tol. : Acceptable deviation to the desired center of mass.

  • X : X-coordinate for desired center of gravity.

  • Y : Y-coordinate for desired center of gravity.

  • Z : Z-coordinate for desired center of gravity.

  • Inertia : Optionally modify mass moment of inertia.

  • Ixx : Desired Ixx component for mass moment of inertia.

  • Iyy : Desired Iyy component for mass moment of inertia.

  • Izz : Desired Izz component for mass moment of inertia.

  • Ixy : Desired Ixy component for mass moment of inertia.

  • Iyz : Desired Iyz component for mass moment of inertia.

  • Ixz : Desired Ixz component for mass moment of inertia.