modal analysis about a model with constraints
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i want to calculate the frequency of a scissor element
four beam elements，six nodes
the equation can be written as follows：
but i dont know how to deal the constraint equations，
can anyone provide a solution，or provide some references， thank you very much
the commands analyed in Ansys are as follows
finish
/clear
/PREP7/NUMBER,-1
/VIEW,1,1,1,1
/ANG,1ET,1,BEAM188 ! BEAM
SECTYPE,1,BEAM,CSOLID
SECDATA,0.005
MP,EX ,1,6.9E10
MP,PRXY,1,0.3
MP,DENS,1,2700
PI=2*ASIN(1)zl=1
sl=1N,1,0,-1*zl,0
N,2,0,zl,0
N,3,0,0,sl
N,4,0,0,sl
N,5,0,zl,2*sl
N,6,0,-1*zl,2*slTYPE,1
secnum,1
MAT,1
E,1,3
E,3,5
E,2,4
E,4,6CSYS,0
NROTAT,ALLCP,NEXT,UX,3,4
CP,NEXT,UY,3,4
CP,NEXT,UZ,3,4
CP,NEXT,ROTY,3,4
CP,NEXT,ROTZ,3,4D,1,ALL
D,2,ALL/SOLU
ANTYPE,2
MODOPT,LANB,10
MXPAND,10,,,0
SOLVE -
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