# DVMBRL1

Bulk Data Entry Linearly relates a design variable to properties of an MBD entity using the equation: ${P}_{i}=C0+\sum {\mathit{COEF}}_{i}*{\mathit{DVID}}_{i}$

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DVMBRL1 ID TYPE BID/

EID

PNAME     C0
DVID1 COEF1 DVID2 COEF2 etc.

## Example 1

To relate the translational x component of stiffness value (K1) on a CMBUSH whose ID is 22 to Design Variable 5.
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DVMBRL1 88 CMBUSH 22 K1     0.0
5 1.0
DESVAR 5 5.00 1.50 9.90

## Example 2

To relate the mass of a rigid boy whose ID is 3 to design variable 5.
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DVMBRL1 88 PRBODY 3 M     0.0
5 1.0
DESVAR 5 5.00 1.50 9.90

## Definitions

Field Contents SI Unit Example
ID Response identity. ID must be unique with respect to other DVMBRL1 and DVMBRL2 cards.

No default (Integer > 0)

TYPE MBD entity type to be related. 1

No default (Character)

BID/EID Body ID or Element ID number. When TYPE is PRBODY, this field is the ID number of a rigid body. When TYPE is CMBUSH(M), CMBEAM(M), or CMSPDP(m), this field is the ID number of a corresponding element.

No default (Integer > 0)

PNAME Property name, such as "A" or "L" (as in the documentation of the PRBODY, CMBEAM(M), CMBUSH(M), and CMSPDP(M) cards).

No default (Character or Integer > 0)

C0 Constant in relationship equation.

Default = 0.0 (Real)

DVIDi DESVAR ID.

No default (Integer > 0)

COEFi Coefficient in relationship equation.

Default = 1.0 (Real)

1. MBD entity type information:
PRBODY
IXX
IYY
IZZ
IXY
IXZ
X
X component of center of gravity.
Y
Y component of center of gravity.
Z
Z component of center of gravity.
CMBEAM/CMBEAMM
L
Undeformed length along the X-axis of the beam.
A
Area of the beam cross-section.
I1
Area moment of inertia in plane 1 about the neutral axis.
I2
Area moment of inertia in plane 1 about the neutral axis.
J
Torsional constant.
K1 ~ K2
Area factor for shear.
CMBUSH/CMBUSHM
K1 ~ K3
Translational stiffness.
K4 ~ K6
Rotational stiffness.
B1 ~ B3
Translational damping.
B4 ~ B6
Rotational damping.
P1 ~ P3