Hi!<\/p>\n
I have an easy system (s. fig.) which is a harmonic torsional excited water filled tube.<\/p>\n
<\/p>\n
Now I want to extract and average the nodal forces to calculate the torsional moment around the tube axis in a user defined cross-section (component, sliced like a salami \ud83d\ude42 ) in the pipe wall via APDL Postcommands. I tried the following but it didn’t work out:<\/p>\n
…<\/p>\n
direc_axial = ‘Y’
direc_trans_1 = ‘Z’
direc_trans_2 = ‘X’<\/p>\n
CMSEL,S,ebene !Auswahl der Ebene als Komponente
*GET,n_nodes,NODE,,count !Anzahl der Knoten in der Ebene
*DIM,calc_array,ARRAY,n_nodes,13 !Init Array für flächengewichtete R\/Im des Drucks und der Fläche (n_nodes x 2)<\/p>\n
set,1,i,,IMAG
next_node = 0
*DO,j,1,n_nodes,1
next_node = ndnext(next_node)<\/p>\n
calc_array(j,1) = ARNODE(next_node)<\/p>\n
!Rotation um Rohrachse …<\/p>\n Actually it thought that this should be a hard task… but it turns out to be. Does anybody has some suggestions for an alternative workflow??<\/p>\n Greetings!!!<\/p>\n Christian<\/p>\n","protected":false},"template":"","class_list":["post-364385","topic","type-topic","status-closed","hentry","topic-tag-ansys-mechanical-apdl","topic-tag-harmonic-acoustics","topic-tag-harmonic-analysis"],"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
*GET,r_trans1,NODE,next_node,LOC,direc_trans_1
*GET,r_trans2,NODE,next_node,LOC,direc_trans_2
r_abs = sqrt(r_trans1**2 + r_trans2**2)
u_rot = 1\/r_abs*(-r_trans2*u_trans1 + r_trans1*u_trans2) !ACHTUNG: VZ in der Klammer ist entscheidend für die Phase
calc_array(j,11) = u_rot*calc_array(j,1)
!Moment um Rohrachse
*GET,f_trans1,NODE,next_node,RF,direc_trans_1<\/strong>
*GET,f_trans2,NODE,next_node,RF,direc_trans_1<\/strong>
f_rot = 1\/r_abs*(-r_trans2*f_trans1 + r_trans1*f_trans2)<\/strong>
m_rot = f_rot*r_abs<\/strong>
calc_array(j,13) = m_rot*calc_array(j,1)
*ENDDO<\/p>\n