CONGM

CONGM defines a concentrated mass element at an NLFE grid.

<CONGM

id = "integer"

gid = "integer"

mass = "real"

[

x = "real"

y = "real"

z = "real"

]

i11 = "real"

i22 = "real"

i33 = "real"

[

i21 = "real"

i31 = "real"

i32 = "real"

]

Unique identification number.

gid

Grid identification number.

mass

First grid identification number.

X, Y and Z offset distance from the grid point to the center of gravity. Default for x, y and z is 0.

i11

i22

i33

Mass product of inertia about X, Y and Z axes respectively.

i21

i32

i33

Mass product of inertia about X-Y, X-Z and X-Y respectively. Default value for all three attributes is 0.

1.	The x, y and z coordinates of the mass center of gravity are represented in the global coordinate system.

2.	The form of the inertia matrix about its center of gravity is calculated as:

congm

where,

and,

3.	All four grids defined for this element must be unique.

The example demonstrates the definition of a CONGM element.