OS-E: 4010 Connecting Rod of a Slider Crank

This example involves the shape optimization of the connecting rod of a slider crank.

Model Files

Refer to Access the Model Files to download the required model file(s).

The model file used in this example includes:

sc_design.fem

Model Description

The mass of the connecting rod is to be minimized. Initial velocity is applied to the block of the model. The stress of all connecting rod elements must be less than an allowable value.

bar_2
Figure 1. Slider Crank

bar_3
Figure 2. Four Design Variables
Input decks for the design are as follows.
SUBCASE     1
 MBSIM   = 1
 INVEL   = 2
 DESSUB  = 10
 SPC     = 10
$
BEGIN BULK
$
DESVAR      1   UPPER0.0     -1.0    2.0
DESVAR      2   LOWER0.0     -1.0    2.0
DESVAR      3LEFT_OUT0.0     -1.0    1.0
DESVAR      5RIGHT_OU0.0     -1.0    1.0
$
DRESP1  1   MASS    MASS    PSOLID                      18
DRESP1  2   STRESS  STRESS  PSOLID         SVM              18
$
DCONSTR  10    2     -100.E1 100.E1
 
DVGRID*         1       9925511       0      1.0
*       -1.568286121E-02-3.884642199E-02-6.483015791E-10
                       :
                       :

Results

The final design appears as shown below:

bar_4
Figure 3. Optimum Design