Mass

Analysis > Mass

This tool is used to define mass element by selecting a node and specifying its properties such as mass and moment of inertia. This tool also has option to calculate mass, center of mass and moment of inertia of meshed components.

Description

  1. The coordinate system is used to define mass with respect to a local coordinate system and it is also used for calculating mass properties with respect to a local coordinate system.
  2. Mass can be directly applied to the nodes or it can be applied to center of mass of the selected bodies by calculating its center of mass and applying mass at the orphan node or free node created at the center of mass.
  3. Mass of the body and its mass moment of inertia with respect to center of mass can be calculated for both FEM and CAD bodies. The mass properties can be calculated for multiple bodies also. The only prerequisite is that property needs to be defined for the bodies before calculating mass properties.
  4. Mass applied on the center node of RBE will be considered for Mass and Moment of Inertia calculation if RBE bodies are selected for calculation.
  5. The Export option will export the mass properties of the calculated bodies in *.csv format.
    • The *.csv file will be of the format "Name,Mass,center of mass-X,center of mass-Y,center of mass-Z,Ixx,Iyy,Izz,Ixy,Iyz,Izx"

      Sample format:

      BRACKET_STEEL,75.968,-22.78,117.821,346.94,4388.64,2682.32,29939.38,-2281.14,-13442.06,-4977.75

      Oilpan,28.97,60.23,-13.29,-143.81,27262472.68,53260478.05,68428606.99,4174828.35,1713558.97,1486438.40

      Crankcase,1545.15,14.62,-8.75,112.86,1343798.33,299552095.6,306778881.39,-494181.37,-5596735.73,1971790.8

Cards supported for various solvers

Solver Supported Cards
OptiStruct / Nastran CONM2
Abaqus

*ELEMENT,TYPE=MASS

*MASS

*ELEMENT,TYPE=ROTARYI

*ROTARY INERTIA
Permas

$ELEMENT TYPE=MASS3 (or) $ELEMENT TYPE=MASS6

$GEODAT MASS
Ansys ET,,MASS21(with Real Constants)
ADVENTURECluster $NodalMass