FEM ConstraintDisplacement/ro: Difference between revisions
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{{Docnav|[[FEM_ConstraintFixed|Constraint fixed]]|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintFixed.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintPlaneRotation.png}} |
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|[[FEM_ConstraintFixed|Constraint fixed]] |
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<span id="Description"></span> |
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==Descriere== |
==Descriere== |
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Creează o constrângere MEF pentru a o deplasare prescrisă a unui obiect selectat pentru un număr specificat de grade de libertate. |
Creează o constrângere MEF pentru a o deplasare prescrisă a unui obiect selectat pentru un număr specificat de grade de libertate. |
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<span id="Usage"></span> |
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== Cum se folosește == |
== Cum se folosește == |
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#Click pe [[Image:FEM ConstraintDisplacement.png|32px]] sau alegeți {{KEY|Model}} → '''Mechanical Constraints''' → {{KEY|[[Image:FEM ConstraintDisplacement.png|32px]] Constraint displacement}} din meniul de sus. |
#Click pe [[Image:FEM ConstraintDisplacement.png|32px]] sau alegeți {{KEY|Model}} → '''Mechanical Constraints''' → {{KEY|[[Image:FEM ConstraintDisplacement.png|32px]] Constraint displacement}} din meniul de sus. |
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#Selectați în vizualizarea 3D obiectul la care trebuie aplicată constrângerea, care poate fi |
#Selectați în vizualizarea 3D obiectul la care trebuie aplicată constrângerea, care poate fi |
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## faces |
## faces |
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#Alegeți un grad de libertate pentru a stabili sau a prescrie o deplasare la. |
#Alegeți un grad de libertate pentru a stabili sau a prescrie o deplasare la. |
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== |
==Formulas== |
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{{Version|0.21}} |
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===General=== |
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For the [[Image:FEM_SolverElmer.svg|32px]] [[FEM_SolverElmer|solver Elmer]] it is possible to define the displacement as a formula. In this case the solver sets the displacement according to the given formula variable. |
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Take for example the case that we want to perform a [[FEM_SolverElmer_SolverSettings#Timestepping_(transient_analyses)|transient analysis]]. For every time step the displacement <math>d</math> should be increased by 6 mm: |
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<math>\quad |
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d(t)=0.006\cdot t |
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</math> |
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enter this in the ''Formula'' field:</br> |
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{{incode| Variable "time"; Real MATC "0.006*tx"}} |
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This code has the following syntax: |
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* the prefix ''Variable'' specifies that the displacement is not a constant but a variable |
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* the variable is the current time |
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* the displacement values are returned as ''Real'' (floating point) values |
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* ''MATC'' is a prefix for the Elmer solver indicating that the following code is a formula |
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* ''tx'' is always the name of the variable in ''MATC'' formulas, no matter that ''tx'' in our case is actually ''t'' |
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===Rotations=== |
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Elmer only uses the '''Displacement *''' fields of the boundary condition. To define rotations, we need a formula. |
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If for example a face should be rotated according to this condition: |
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<math>\quad |
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\begin{align} |
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d_{x}(t)= & \left(\cos(\phi)-1\right)x-\sin(\phi)y\\ |
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d_{y}(t)= & \left(\cos(\phi)-1\right)y+\sin(\phi)x |
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\end{align} |
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</math> |
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then we need to enter for '''Displacement x'''</br> |
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{{incode| Variable "time, Coordinate" |
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Real MATC "(cos(tx(0)*pi)-1.0)*tx(1)-sin(tx(0)*pi)*tx(2)}} |
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and for '''Displacement y'''</br> |
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{{incode| Variable "time, Coordinate" |
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Real MATC "(cos(tx(0)*pi)-1.0)*tx(2)+sin(tx(0)*pi)*tx(1)}} |
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This code has the following syntax: |
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* we have 4 variables, the time and all possible coordinates (x, y z) |
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* ''tx'' is a vector, ''tx(0)'' refers to the first variable, the time, while ''tx(1)'' refers to the first coordinate ''x'' |
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* ''pi'' denotes <math>\pi</math> and was added so that after <math>t=1\rm\, s</math> a rotation of 180° is performed |
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<span id="Notes"></span> |
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==Note== |
==Note== |
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#constrângerea utilizează tabelul *BOUNDARY în CalculiX. Fixarea unui grad de libertate este explicată la http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node164.html și se precizează o deplasare pentru un anumit grad de libertate http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node165.html |
#constrângerea utilizează tabelul *BOUNDARY în CalculiX. Fixarea unui grad de libertate este explicată la http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node164.html și se precizează o deplasare pentru un anumit grad de libertate http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node165.html |
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</div> |
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{{Docnav |
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{{Docnav|[[FEM_ConstraintFixed|Constraint fixed]]|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintFixed.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintPlaneRotation.png}} |
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|[[FEM_ConstraintFixed|Constraint fixed]] |
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|[[FEM_ConstraintContact|Constraint contact]] |
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|[[FEM_Workbench|FEM]] |
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|IconL=FEM_ConstraintFixed.svg |
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|IconR=FEM_ConstraintContact.svg |
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}} |
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Latest revision as of 16:12, 16 November 2023
FEM ConstraintDisplacement |
poziția meniului |
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Model → Mechanical Constraints → Constraint displacement |
Ateliere |
FEM |
scurtătură |
nici unul |
Prezentat în versiune |
- |
A se vedea, de asemenea, |
FEM tutorial |
Descriere
Creează o constrângere MEF pentru a o deplasare prescrisă a unui obiect selectat pentru un număr specificat de grade de libertate.
Cum se folosește
Formulas
General
For the solver Elmer it is possible to define the displacement as a formula. In this case the solver sets the displacement according to the given formula variable.
Take for example the case that we want to perform a transient analysis. For every time step the displacement should be increased by 6 mm:
enter this in the Formula field:
Variable "time"; Real MATC "0.006*tx"
This code has the following syntax:
- the prefix Variable specifies that the displacement is not a constant but a variable
- the variable is the current time
- the displacement values are returned as Real (floating point) values
- MATC is a prefix for the Elmer solver indicating that the following code is a formula
- tx is always the name of the variable in MATC formulas, no matter that tx in our case is actually t
Rotations
Elmer only uses the Displacement * fields of the boundary condition. To define rotations, we need a formula.
If for example a face should be rotated according to this condition:
then we need to enter for Displacement x
Variable "time, Coordinate"
Real MATC "(cos(tx(0)*pi)-1.0)*tx(1)-sin(tx(0)*pi)*tx(2)
and for Displacement y
Variable "time, Coordinate"
Real MATC "(cos(tx(0)*pi)-1.0)*tx(2)+sin(tx(0)*pi)*tx(1)
This code has the following syntax:
- we have 4 variables, the time and all possible coordinates (x, y z)
- tx is a vector, tx(0) refers to the first variable, the time, while tx(1) refers to the first coordinate x
- pi denotes and was added so that after a rotation of 180° is performed
Note
- constrângerea utilizează tabelul *BOUNDARY în CalculiX. Fixarea unui grad de libertate este explicată la http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node164.html și se precizează o deplasare pentru un anumit grad de libertate http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node165.html
- Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor
- Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)
Constraints
- Electromagnetic: Electrostatic potential, Current density, Magnetization
- Geometrical: Plane rotation, Section print, Transform
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- Overwrite Constants: Constant vacuum permittivity
- Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run
- Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
- Getting started
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