TRIM

Bulk Data Entry Specifies the constraints for aeroelastic trim variables.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
TRIM SID MACH Q LABEL1 UX1 LABEL2 UX2 AEQR
LABEL3 UX3 etc.

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
TRIM 23 0.8 110.0 URDD3 1.0 ANGLEA 6.0 0.0
URDD5 0.3

Definitions

Field Contents SI Unit Example
SID Trim set identification number. 1 2

(Integer > 0)

  
MACH Mach number.

(0.0 ≤ Real < 1.0)

  
Q Dynamic pressure.

(Real > 0.0)

  
LABELi The label identifying aerodynamic trim variables defined on an AESTAT or AESURF entry.

(Character)

  
UXi The magnitude of the aerodynamic extra point degree of freedom.

(Real)

  
AEQR Flag to request a rigid trim analysis.
0.0
Provides a rigid trim analysis (ignoring the effects of structural deformation on the loading).
1.0 (Default)
Provides standard aeroelastic trim analysis.
Intermediate values are permissible, but have no physical interpretation (they may be useful for model checkout).

(0.0 ≤ Real ≤ 1.0)

  

Comments

  1. The TRIM entry should be selected with the Case Control command TRIM.
  2. The SID should be unique among all the TRIM entries.
  3. The selected TRIM entry specifies the constrained values of the listed extra point degrees-of-freedom (“trim variables”) for a particular loading condition. These variables are listed on AESTAT and/or AESURF entries.
  4. The unit of the angle of attack (ANGLEA) and the angle of sideslip (SIDES) is radians.