# mina rakhshi's blog

## modal

Hi every body;

I am doing modal analysis on a solid sphere that is filled with water in APDL ANSYS. after seting rane and number of frequencies; when use from unsymm method to earn natural frequencies, I have just two frequency! please help me. How can solve it?

Regards;

Mina

## modal analysis

Hi Friends;

I want to do modal analysis for a sphere that filled with water in APDL ANSYS. How can couple Fluid and solid in it. please help me.

Regards;

Mina

## contact element

Hi friends;

I built a model in solidworks and Imported it in ansys workbench for modal analysis. In ansys workbench my model has many gaps; therefore many contact and target elements are defined. In ansys workbench bonded contact element is defined. Do effect bonded contact and target elements on frequencies and modeshapes in my problem? Do change bonded contact and target elements frequencies and modeshapes?

Regards.

Mina

## Integral point

Hi friends;

what's different between Integral point and Node in Ansys, and what's "Node List" in ansys, List of Integral point or Node?

Regards,

Mina

Hi everybody;

In an ansys 3D-planner model, Is it possible to vary the material properties (E) as a function of coordinates, E=f(x,y,z)? one way is to vary material properties for every element But in this condition material properties in boundry of elements is discontinuous. Is it possible to vary material properties as a function tool in ansys then map it on table similar loads and boundry condition?

Regards.

Mina

## TB,elastic

Hi friends;

I am doing modal analysis for functionally graded material in APDL ANSYS. equation of material properties has three independent variables,(x,y,z), and element type is solid186. I used from function tool for loading equation then saved it as table, hereinafter I used from TB

command:

TB,elastic,1,,,,,%hh%

hh is table name.

warning message was created: "the function or table specification hh for material number 0 is currently allowed for joint element material specification. The TB command is ignored.

## small frequency

Hi freinds,

I have a model in ansys, I did modal analysis on it, but low frequency don't appear in it. in experimental results appear low frequency . please help me, why low frequency don't appear in ansys.

experimental results:

3.5

7.5

11.5

14.5

19

21.5

22

26.5

47.12

72.26

91.11

119.4

135.1

166.5

ansys result:

*****  INDEX OF DATA SETS ON RESULTS FILE  *****

SET   TIME/FREQ    LOAD STEP   SUBSTEP  CUMULATIVE

## change name variable

Hi friends;

I want to change name variable in a do loops in apdl ansys and have arrays with different index(A1,A2,....). but I don't know how should do it. please help me.

mina

## inverse of matrix

Hi everybody;

I want to compute inverse of matrix in apdl ansys, but I don't know how should do it? please help me.

regards.

Mina

## ACP

Hi friends;

I have three volumes with different materials, I want to define material properties for them in workbench 14, but acp module isn't in it.

How should I define material properties for every layer from volume? Is any way in workbench14 or I should install workbench 15?

my model in workbench is below:

Regards.

## mesh file

Hi everybody;

I have a meshing model in workbench, I want to open it in APDL ANSYS. How should do this work?

Regards.

Mina

## assembly

Hi friends;

I want to assemble three volumes with different properties in apdl ansys, but ansys ignore CMGRP command when I use it, what's problem my code? How can I assemble three volumes? please help me.

my code is:

/PREP7

~PARAIN,'Geom','x_t','.\DESKTOP\',SOLIDS,0,0

ET,1,solid186

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,EX,1,,3.013

MPDAtA,PRXY,1,,0.3

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDAtA,DENS,1,,1.092

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,EX,2,,1.65

MPDAtA,PRXY,2,,0.3

MPTEMP,,,,,,,,

## VMESH

Hi friend,

I have three volumes. I did modal analysis in apdl ansys on them But I have errors:

Element type 1 is unknown, which cannot be used with the vmesh command, meshing of volum 1 abborted.

my apdl code is:

et,1,solid186

mp,1,3.013

mp,2,1.65

mp,3,0.437

mp,dens,1,1.092

mp,dens,2,0.01

mp,dens,3,0.917

mp,nuxy,1,0.3

mp,nuxy,2,0.2

mp,nuxy,3,0.1

~PARAIN,'Geom','x_t','.\DESKTOP\',SOLIDS,0,0

vsel,s,,1

vatt,1,1,0

smrt,6

vmesh,all

allsel

vsel,s,,2

## VMESH

Hi everybody;

I have three volumes in ansys, I did modal analysis on them in apdl ansys but I have an error from VMESH  command for external volum(volum 1) please help me, how can correct it?

my model, errors and my apdl code in ansys is attached:

Regars

mina

## subroutine uthick

Hello every body,

I want to model a shell that has variable thickness, I should use from subroutine uthick in apdl ansys and studied manual ansys but it is very stunner, I don't know that how should use it, please help me.

my model is attached bellow:

Regards

Mina.

## workbench to ansys

Hi friends,

I want to import my model from workmench to ansys, How should do this work?

Mina

## I imported But....

I imported my file as parasolid(x_t) to ansys workbench, But my model didn't show. I don't know that how should create it in ansys workbench.

## import solid works15 to ansys 14

Hi friends,

I have a model in solid works to has three laminate. I want to create the model in ansys. I saved it with suffixes parasolid, iges and step But ansys didn't show it. How can I Import it in ansys? please help me.

can I import this model in workbench and then create it in ansys? How should do this work.

model is showed below:

## shell with Multi thickness

Hi friends,

I have a shell with multi thickness in ansys But I don't know to how should describe multi thickness in section command in APDL Ansys.

my model in solidworks is attached:

mina.

## shell with Multi thickness

Hi friends,

I have a shell with multi thickness in ansys But I don't know to how should describe multi thickness in section command in APDL Ansys.

my model in solidworks is attached:

mina.

## Cylindrical coordinate system

Hi everybody,

I want to enter coordinate of many points in Cylindrical coordinate system in solidworks, But I don't know how should do this work.

Mina.

## SolidWorks

Hi friends,

I have a shell model in solidworks, I want to full it's volume But don't know that how do it? edgs of this model are discontinuous curve.

Mina.

## Model updating FGM

Hi friends,

I want many articles about Model updating Functionally Graded Material, But I don't find them.

Mina.

## APDL

My APDL code for plate:

## plate

Hi friends,

I want to model a plate with fix supports in APDL ANSYS but I receive an error that send it for you. dimensions of the plate are (0.2*0.2)m2 and carries pressure load 50(KN/m2).

mina.