CONM2 – Concentrated Mass Element Connection, Rigid Body Form
Defines a concentrated mass at a grid point of the structural model.
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(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
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CONM2 |
EID |
G |
CID |
M |
X1 |
X2 |
X3 |
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I11 |
I21 |
I22 |
I31 |
I32 |
I33 |
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(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
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CONM2 |
2 |
15 |
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49.7 |
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16.2 |
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16.2 |
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7.8 |
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Field |
Contents |
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EID |
Unique element identification number. No default (Integer > 0) |
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G |
Grid point identification number. No default (Integer > 0) |
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CID |
Coordinate system identification number. Default = 0 (Integer > -1) |
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M |
Mass value. No default (Real) |
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X1, X2, X3 |
Offset distance from the grid point to the center of gravity of the mass in the coordinate system defined by CID, unless CID = -1, in which case X1, X2, and X3 are the coordinates (not offsets) of the center of gravity of the mass in the basic coordinate system. |
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Iij |
Mass moments of inertia measured at the mass c.g. Default = 0.0 (Real) |
Element identification numbers must be unique with respect to all other element identification numbers.
If the continuation is omitted, all rotary inertia is assigned zero values.
The form of the inertia matrix about its c.g. is taken as:
where M = 
and 
are components of distance
from the c.g. The negative signs for the off-diagonal terms are supplied
by the program.
If CID = -1, then the offsets
are computed internally as the difference between the grid point location
and X1, X2, and X3. The grid points may be defined in a local coordinate
system, in which case the values of 
must be in a coordinate
system that parallels the basic coordinate system.
If CID > 0, then X1, X2, and X3 are defined by a local Cartesian system, even if CID references a spherical or cylindrical coordinate system.
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Guidelines for Bulk Data Entries
Alphabetical List of Bulk Data Entries