DVMBRL1

Bulk Data Entry Linearly relates a design variable to properties of an MBD entity using the equation: P i = C 0 + ∑ COEF i * 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)

Comments

  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
    Translational preload.
    P4 ~ P6
    Rotational preload.
    CMSPDP/CMSPDPM
    K
    Stiffness
    B
    Damping
    L
    Unstretched length of spring damper.
    PF
    Preload force.
  2. This card is represented as an optimization design variable property relationship in HyperMesh.