ANSYS命令流 帮忙解释下

2024-11-20 06:39:18
推荐回答(1个)
回答1:

下面的所有东西,希望楼主拷贝到记事本里面查看,不要选择自动换行!  

/PREP7                   ! 进入前处理器

ET,1,BEAM4               ! 定义单元beam4,是个三维梁单元

KEYOPT,1,2,0             ! 定义单元的关键选项,如果后面是0,代表默认的,可以先不用理解,

KEYOPT,1,6,0

KEYOPT,1,7,1             ! 这里定义第七个关键选项,定义为编号1,也就是计算陀螺阻尼矩阵方程,要求

                         ! IYY 等于 IZZ,也就是两个转动惯量要相等,这两个量要在实常数中定义

                         ! 也就是下面的命令R

KEYOPT,1,9,0

KEYOPT,1,10,0 

*SET,p,acos(-1)          ! 定义三个参数,分别是派(4.1315)、第一个半径R1,第二个半径r2

*SET,R1,5

*SET,R2,60               ! 半径的单位

                         ! 定义单元的实常数,有两个,因为有两个半径,分别就是下面的R,1

                         ! 和r,2

                         ! r命令的定义中需要根据使用单元beam4来一一对应,不同的单元R命令

                         ! 定义的意思是不一样的,具体每个意思,下图看,一定要一一对应

                         ! 这里就先是截面积,Z向转动惯量,Y像转动惯量,是一样的,从上面的

                         ! 关键选项定义中可以看的出来,KEYOPT,1,7,1

R,1,p*R1**2,p*R1**4/4,p*R1**4/4,2*R1,2*R1, , 

RMORE, ,p*R1**4/2, , ,2175, ,     ! 这个也是定义实常数,因为命令只能定义6个数,从第七个

                                  ! 就要使用这个命令,编号可以从下图中对应下

R,2,p*R2**2,p*R2**4/4,p*R2**4/4,2*R2,2*R2, ,   ! 定义第二个实常数R,2

RMORE, ,p*R2**4/2, , ,2175, , 

MPTEMP,,,,,,,,        ! 这里来定义材料属性,目前楼主提供的是GUI操作以后的

                      ! ,这个需要相应简化,因为GUi操作中一般包括了温度的考虑,所以使用了几个温度的命令

                      ! 目前看来只是有一个温度,所以不用考虑温度,简化后的,在后面的注释中,注释开始是!(感叹号)

MPTEMP,1,0 

MPDATA,EX,1,,2e5

MPDATA,PRXY,1,,.3 

MPTEMP,,,,,,,, 

MPTEMP,1,0 

MPDATA,DENS,1,,1e-10

! 简化后的材料属性

! mp,ex,1,2e5         ! 分别定义弹性模量,泊松比,密度,其中的1代表第一个材料属性

! mp,PRXY,1,0.3

! mp,DENS,1,1e-10

MPTEMP,,,,,,,,        ! 这里就是定义第二个材料属性了!同样包括弹性模量,泊松比,密度

MPTEMP,1,0 

MPDATA,EX,2,,2E5

MPDATA,PRXY,2,,.3 

MPTEMP,,,,,,,, 

MPTEMP,1,0 

MPDATA,DENS,2,,8E-8 

K, ,,,,              ! 定义两个关键点,第一个是0,第二个坐标是:(100,0,0)

K, ,100,,, 

TYPE, 1              ! 选择第一个单元,也就是beam4

MAT, 1               ! 选择第一个材料属性

REAL, 1              ! 选择第一个实常数

ESYS, 0              ! 选择默认的单元坐标系统

LSTR, 1, 2           ! 用刚才生成的两个关键点,建立一条直线

LESIZE,ALL, , ,200, ,1, , ,1,   ! 把建立的这条直线划分为200个

LMESH, 1             ! 根据划分的线的段数,网格这条线,从而生成有限元模型

D,1,UX               ! 对于第一个节点(也就是原点位置的那个节点)进行约束,三个平移方向都约束,但是转动方向不约束,

                     ! 因为单元beam4是有六个自由度的

D,1,UY

D,1,UZ

D,102,UY             ! 对于第102个节点,这样来算他的位置,总共长度是100,划分为200分,那么102是那个位置,楼主应该知道了吧

                     ! 选择了Y方向和Z方向的平移约束

D,102,UZ          

FLST,2,1,2,ORDE,1    ! 后面的两个命令结合起来就是选择了第200个节点,但是没有具体操作,

                     ! 只是有了拾取选择这个点的操作,这两个命令一般是GUI直接生成的,写命令流的一般不使用这两个操作

                     ! 所以这两个命令其实什么任务都没有做目前

FITEM,2,200

对上面的命令一一般是需要简化的,简化后的就是:

/PREP7 

ET,1,BEAM4 

KEYOPT,1,7,1

*SET,p,acos(-1)

*SET,R1,5

*SET,R2,60 

R,1,p*R1**2,p*R1**4/4,p*R1**4/4,2*R1,2*R1, , 

RMORE, ,p*R1**4/2, , ,2175, , 

R,2,p*R2**2,p*R2**4/4,p*R2**4/4,2*R2,2*R2, , 

RMORE, ,p*R2**4/2, , ,2175, , 

mp,ex,1,2e5     

mp,PRXY,1,0.3

mp,DENS,1,1e-10

mp,ex,2,2e5     

mp,PRXY,2,0.3

mp,DENS,2,8e-8

K,1,,,, 

K,2,100,,, 

MAT, 1

REAL, 1 

LSTR, 1, 2 

LESIZE,ALL, , ,200

LMESH, 1

D,1,UX

D,1,UY

D,1,UZ

D,102,UY

D,102,UZ

FLST,2,1,2,ORDE,1 

FITEM,2,200

简化后的命令楼主结合本人说的,可以理解下

这段话因为只是在建模,所以没有执行什么计算的,思路其实我已经说的很明确了:

首先定义单元,指定一个关键选项包括了陀螺阻尼效果,然后再定义两个实常数,然后定义了两个材料属性,然后建立一个一个线,使用第一个实常数,和第一个材料属性对这个线进行了网格!其次再对这个线进行了约束的施加,原点位置三个平移方向全约束,对102个节点位置,进行了两个方向的约束

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