Adams柔性体例子.docx

首先，adams2005版本里有autoflex模块，可以由已经建立好的刚体生成柔性体（有限元），但是此模块功能有限，稍微复杂一些的几何体往往生成不了有限元模型，所以之后的版本里就不再有这个模块了。 其次，ansys建立柔性体的大致步骤如下：先建立好有限元模型，然后用mass21单元类型划分外联点单元，建立刚性区域（rigid region），最后把所有单元与刚性区域节点导出。 ansys的help里12.8. Sample Rigid Body Dynamic Analysis里以一个连杆的例子介绍了导出过程，而且有相应命令流，直接在ansys命令窗口复制进去即可运行，输出对应的模态中性文件，命令流如下： /BATCH,list /FILNAME,adamsout ! Define jobname /TITLE,Export flexible component to ADAMS ! /PREP7 ! Enter preprocessor ! ! Define Parameters of rectangular rod radh=6 ! Radius of the holes in the rod thick=10 ! Rod thickness width=25 ! Rod width length=300+4*radh ! Rod length ! Build geometry RECTNG,0,length,0,width CYL4,2*radh,width/2,radh CYL4,length-2*radh,width/2,radh ASBA,1,2 ASBA,4,3 VEXT,1, , ,0,0,thick ! ET,1,solid45 ! Define SOLID45 as element type 1 ET,2,beam4 ! Define BEAM4 as element type 2 ! MP,EX,1,7.22e4 ! Material of the rectangular rod MP,PRXY,1,0.34 MP,DENS,1,2.4e-9 ! MP,EX,2,2.1e5 ! Material of the beams used for the spider web MP,PRXY,2,0.3 MP,DENS,2,0.1e-9 ! R,1,78.528,490.67,490.67,10,10 ! Real constant for BEAM4 RMORE,0.85716,0.85716, ! TYPE,1 ! Set element type attribute pointer to 1 MAT1,1 ! Set material attribute pointer to 1 ESIZE,thick/3,0, ! Define global element size VSWEEP,1 ! Mesh rod ! ! Define interface points: numbers must be higher than highest ! node number already defined N,100000,2*radh,width/2,thick/2 ! Define interface point 1 N,100001,length-2*radh,width/2,thick/2 ! Define interface point 2 ! NWPAVE,100000 ! Set working plane to interface point 1 WPSTYL,1 ! Set working plane type to cylindrical CSYS,4 ! Activate working plane NSEL,S,LOC,X,radh ! Select nodes on cylindrical hole NSEL,A,100000 ! Also select interface node ! ! Generate spider web of beams *GET,nmin,node,num,min *GET,nnum,node,count *SET,jj,0 TYPE,2 MAT,2 REAL,1 *DO,jj,1,nnum-2 E,100000,nmin NSEL,u,nmin *GET,nmin,node,num,min *ENDDO ! ALLS ! NWPAVE,100001 ! Set working plane to interface point 2 WPSTYL,1 ! Set working plane type to cylindrical CSYS,4 ! Activate working plane NSEL,S,LOC,X,radh ! Select nodes on cylindrical hole NSEL,A,100001 ! Also select interface node ! ! Generate spider web of beams *GET,nmin,node,num,min *GET,nnum,node,count *SET,jj,0 TYPE,2 MAT,2 REAL,1 *DO,jj,1,nnum-2 E,100001,nmin NSEL,u,nmin *GET,nmin,node,num,min *ENDDO ! ALLS ! /UNITS,MPA ! Define units used: millimeter ! megagram, second, newton SAVE ! Save database