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--- doc:user:elements:specials:damping [2013/07/11 18:08] – joris
+++ doc:user:elements:specials:damping [2016/03/30 15:23] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Damping ======
+===== Materials=====
+A damping is defined is the same way as volume materials:
+  materialno = materialset.define (number, type)
+  materialno = materialset(number)
+  materialno.put(param, value)
+  materialno.depend(param, fct, Key(Lock)))
+  ...
+|''number'' | damping number (must be unique for all element in ''materialset'', not just for dampings) |
+|''type'' | type of damping(for example ''DampingMaterial'') |
+|''param'' | name of the damping parameter (for example ''SPRING_FC'') |
+|''value'' | value of the corresponding parameter|
+|''fct'' | function which characterizes the dependency of the property (optional: no ''fct'' if no dependency) |
+|''Lock'' | [[doc:user:general:locks|Lock]] which defines the dependency variable of the property (compulsory if there is a dependency) |
+==== DampingMaterial ====
+=== Description ===
+Damping material
+=== Parameters ===
+^   Name                                          ^     Metafor Code     ^  Dependency ^
+| Damping coefficient   |  ''SPRING_FC''  |  -  |
+===== Element=====
+Once the [[#Materials|material]] is defined, it must be associated to an ''[[doc:user:elements:general:def_element_properties|ElementProperties]]'':
+  prp = ElementProperties(typeEl)
+  prp.put(param1, value1)
+  prp.depend(param1, fct1, Lock1)) #facultatif
+  prp.put(param2, value2)
+  prp.depend(param2, fct2, Lock2)  # facultatif
+  ...
+where
+|''typeEl'' | desired element (for example ''Damping[2|3]DElement'' for dampings)|
+|''param1'', ''param2'' | name of the property associated to the element (for example MATERIAL to associate the desired material)|
+|''value1'', ''value2'' | value of the corresponding property  |
+|''fct1'', ''fct2'' | function which characterizes the dependency of the property (optional: no fct if no dependency) |
+|''Lock1'', ''Lock2'' | [[doc:user:general:locks|Lock]] which defines the dependency variable of the property (compulsory if there is a dependency) |
+==== Damping[2|3]DElement ====
+Damping element. No axisymmetric correction is implemented. They must be associated with a ''FieldApplicator'' interaction.
+=== Parameters ===
+^   Name                                          ^     Metafor Code     ^  Dependency ^
+| ''MATERIAL''    |  Number of the damping material to consider             |  -  |
+| ''STIFFMETHOD'' | Method used to compute the stiffness matrix\\ = ''STIFF_ANALYTIC'' : analytic matrix (default)\\= ''STIFF_NUMERIC''  : numerical matrix           |  -  |
+===== Interaction =====
+Finally, once the ''Mass[2|3]DElement'' ''[[#Element|ElementProperties]]'' is defined, the corresponding interaction is generated with the ''FieldApplicator''. To do so, the corresponding geometric mesh element must be generated using [[doc:user:geometry:mesh:0D]]. Once done, the interaction can be defined and included in the ''interactionset'':
+  app = FieldApplicator(no)
+  app.push(gObject1)
+  app.push(gObject2)
+  ...
+  app.addProperty(prp)        # association of an ElementProperties
+  interactionset.add(app)     # the interaction is added in InteractionSet
+or
+  app = interactionset.add(FieldApplicator(no)) #add returns a reference
+  app.push(gObject1)
+  app.push(gObject2)
+  ...
+  app.addProperty(prp)        # association of an ElementProperties
+where
+| ''no''  | number of the ''Interaction'' (which is to say the ''FieldApplicator'') |
+|''gObject1'', ''gObject2''  | meshed geometric entity where the finite elements are applied |
+| ''prp'' | [[doc:user:elements:general:def_element_properties|Properties]] of [[#Elements]] to generate.|