I have a model with MPC184 as a revolute joint. The displacements at the two coincident nodes do not seem to be the same, however. Also, can I reuse the joint section definition?
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Usually, if the MPC184 joint is not behaving as expected, this may be due to the section definition. The local CS should be located right where the node is, so one cannot reuse a section definition for joints multiple times. Also, the revolute joint really just needs one local CS, so if the user has two different local CS aligned differently, some unexpected results may occur. Please see the below as an example input (with damping and stops). ------------------------------------ finish /clear /pnum,type,1 /num,1 /psym,cs,1 /triad,off /prep7 et,1,184,1 et,2,184,6 r,1 r,2 mp,dens,1,0.1/386.1 tb,joint,2,1,,damp tbdata,16,1e-3 sectype,2,joint,revo secdata, secjoin,,11 secstop,rotx,-acos(-1)/4,acos(-1)/4 n,1,0,0,0 n,2,0,10,0 n,3,0,10,0 n,4,10,10,0 type,1$real,1$mat,1$secn,1 e,1,2 e,3,4 type,2$real,2$mat,2$secn,2 e,2,3 wpoffs,,10 wprota,,,90 cswpla,11,0 wpstyle,,,,,,,,0 d,1,all acel,,386.1 finish /solu antype,trans nlgeom,on time,1 nsubst,100,1e3,100 outres,all,all rescon,define,none allsel,all solve finish /post26 numvar,200 nsol,2,3,u,x,JOINT_UX nsol,3,3,u,y,JOINT_UY nsol,4,3,u,z,JOINT_UZ nsol,12,4,u,x,TIP_UX nsol,13,4,u,y,TIP_UY nsol,14,4,u,z,TIP_UZ esol,20,3,,smisc,14 plvar,2,3,4,12,13,14 ------------------------------------ |
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