Data->Dynamic loads
Dynamic loads are only available in the Rambshell module.
When a dynamic load is assigned to an entity (point., line or area), it is automatically added to the active load case inserted in the active loadcase. See the load cases section for details. Each type of dynamic load has loads have the following options:
Amplitudes: Indicate the amplitude of the dynamic loads.
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Parameters: Define the time variation of the dynamic loads variation in time of the dynamic loads.
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The time variation can be defined using harmonic variations (Sine/Cosine load) or by specifying discrete values in form of a table (Table). The time variations is posible to defined it by mean of an armonic variations (Sine/Cosine Load) or inputing the variations of the dynamic load in a discrete way (Table).
This is a load applied to one point of the structure. The default unit is Newton Default units are Newtons for the force components and Newton·meter for the momentum components. The signs of the components follow the rule established for the constraints. Sign of the components is equal to that defined for the constraints.
There are two types of pressure loads for beams:
In all the cases the applied pressure is by default specified in Newton/meter. pressure applied is given in Newton/meter in default units. The global load is specified in global coordinates. In the global load, the load is given related to the global axes. The local load is specified in the local coordinates defined in the properties section. Local load is related to the local axes defined in the properties section. A load of (0,0,-P(t) ) N/m would take on the following form for each case respectively (considering a beam of length L): in either case would be (for a beam of length L):
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The dynamic local beam load has an additional field for the local moment of torque. In the Dynamic local beam load there is an additional field that is the local torsor momentum.
There are five types of surface loads for shells:
In all cases the applied pressure is by default specified in given in Newton/meter2 in default units. The global load is specified in global coordinates. In the global load, the load is given related to the global axes. The local load is specified in the local coordinates defined in the properties section. Local load is related to the local axes defined in the properties section. A load of (0,0,-P(t) ) N/m2 would take on the following form for each case respectively (considering a shell of length L and width W) in either case would be (for a shell of length L and width W):
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With this condition it is possible to apply a dynamical pressure to a line that forms a boundary of a shell surface. The pressure is by default given in N/m. If the local axes field is set to Global , the pressure vector is specified according to the global axes. Option Automatic permits the definition of an automatic local axes system that is different for every element. The pressure vector will refer to these axes. This last option is useful to assign a local pressure to the boundary of the shell. See: Data->Conditions->Dynamic Loads->Dyn. Shell face load->Draw->Draw all conditions->Only local axes to see how the automatic local axes are defined.