/ADMAS

Block Format Keyword

/ADMAS - Added Masses

Description

Assign additional non-structural mass to nodes or a group of nodes. Optionally the total additional non-structural mass of a part or a group of parts can be defined (applied to shells and solids only) or a surface mass can be assigned to a surface and RADIOSS would then compute the added node based mass value using area (volume) - weighted distribution.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/ADMAS/type/admas_ID/unit_ID
admas_title

If type = 0 or 1

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
Mass		grnd_ID

If type = 2

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
Mass/Area		surf_ID

If type = 3 or 4

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
Mass		grpart_ID	IFLAG

If type = 5

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
Mass1		node_ID1
Mass2		node_ID2
...		...
MassN		node_IDN

If type = 6 or 7, an additional list is provided

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
Mass1		part_ID1	IFLAG
Mass2		part_ID2	IFLAG
...		...	IFLAG
MassN		part_IDN	IFLAG

Field	Contents	SI Unit Example
type	Type of input. = 0: Mass is added to each node of node group. = 1: Mass/N is added to each node of node group. N being the total number of nodes in the node group. = 2: Mass/Area - additional surface mass applied on the shell area = 3: Additional mass distributed on the part-group = 4: Final mass distributed on the part-group. (Comment 2) = 5: Mass is added to each single node = 6: Additional mass distributed on each single part = 7: Final mass distributed on each single part. (Comment 2)
admas_ID	Added mass block identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
admas_title	Added mass block title (Character, maximum 100 characters)
Mass	Added mass (Real)
Mass/Area	Added mass per unit area (Real)
grnd_ID	Node group to which the mass is added (Integer)
surf_ID	Surface to which the mass per unit area is added (Integer)
grpart_ID	Part group to which the mass is added (Integer)
node_IDN	Node to which the mass is added (Integer)
part_IDN	Part to which the mass is added (Integer)
IFLAG	Flag to switch between area weighted distribution and volume weighted distribution of the added mass to parts) (Integer) = 0: volume weighted distribution (shell and solid parts) (default) = 1: area weighted distribution (shell parts only)

1.	This option cannot be used in a 2D axisymmetrical analysis.

2.	Final mass replaces structural mass and final mass for each node must be greater than structural mass. In other words, non-structural mass for each node must be greater than zero. The element time step is not affected by the addition of non-structural mass since the nodal time step changes.

3.	Using /ADMAS additional mass and final mass is in the part level and the node level, not in the element level.

4.	Area or volume weighted distribution of the mass does not account for density of components (referred to the part-group). Therefore, for reasonable distribution of the mass, it is advisable to have the same material and property definition in components of the part group.