{"id":250920,"date":"2023-02-22T04:47:21","date_gmt":"2023-02-22T04:47:21","guid":{"rendered":"\/forum\/?post_type=topic&p=250920"},"modified":"2023-02-22T04:47:21","modified_gmt":"2023-02-22T04:47:21","slug":"tuned-mass-damper-on-a-simple-supported-beam-apdl-script","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/tuned-mass-damper-on-a-simple-supported-beam-apdl-script\/","title":{"rendered":"Tuned Mass Damper on a simple supported beam APDL script"},"content":{"rendered":"

I am trying to model a tuned mass damper (TMD) unit attached to the midpoint of a 12 m long simple supported beam as follows.<\/p>\n

<\/p>\n

From what I read, you can model TMD as a combination of spring-damper element and point mass which are modeled using COMBIN14 element and MASS21 element respectively. I have tried entering the unit model parameters in Mechanical using APDL command script, but it encountered an error when I tried to mesh it. Here is the script as a reference:<\/p>\n

 <\/p>\n

\/PREP7
! Definition of Material and Spring Element
MP, BETD, 21, 5513928
MP, DMPR, 21, 27420.78
ET, 21, COMBIN14, 0, 2<\/p>\n

! Point mass
MP, ALPD, 22, 1000
ET, 22, MASS21, 0, 0, 2<\/p>\n

! Definition of keypoints and spring
K, 1, 6,0,0
K, 2, 6, -1, 0
LSTR, 1, 2
LSEL, S, LINE,,1<\/p>\n

! Definition of orientation keypoints
K, 3, 6, 0, 1
LSEL, S, LINE, , 1
LATT, 21,,,, 3<\/p>\n

! Assign point mass
KSEL, S, KP,, 2
KATT, 22,,,0<\/p>\n

!Meshing
!LSEL, S, LINE, , 1
KMESH, ALL
LESIZE, ALL, 0.1
LMESH, ALL<\/p>\n

FINISH<\/p>\n

\/SOLU<\/p>\n

 <\/p>\n

Executing the command above resulted in the following error:<\/p>\n

\n

*** ERROR ***                           CP =       0.844   TIME= 11:12:38
 Element type 3 is CLOAD201, which cannot be used with the LMES         
 command.  The LMESH operation is aborted at line 1.<\/p>\n<\/div>\n

Is there a mistake in my script? For your information I inserted this command in the Transient Structural analysis block after I did Static Structural and Modal analyses.<\/p>\n

Any help would be appreciated.<\/p>\n

Thank you.<\/p>\n","protected":false},"template":"","class_list":["post-250920","topic","type-topic","status-closed","hentry","topic-tag-ansys-mechanical-apdl"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t