****************** Transient analysis ****************** Perform a mechanical transient analysis. Two different load cases can be selected. Either a force that changes over time is applied. Furthermore, also position or velocity command values can be used to simulated. ----- Loads ----- Open the load case container, where load cases can be defined (CTRL+K on load case to configure). ^^^^^^^^^^^^^^^^^^^^^^^ Configure selected load ^^^^^^^^^^^^^^^^^^^^^^^ Define and configure the load case here. """" Link """" Define at which link the load is applied. """""""""""" Force/Moment """""""""""" Define the direction of the force/moment. By entering 1 in a corresponding direction means that a force/moment is applied in this direction scaled by 1. ========= =================================== Direction Force/Moment ========= =================================== u Force in axial direction v Force in transversal direction w Force in normal direction ru Torque around axial direction rv Moment around transversal direction rw Moment around normal direction ========= =================================== ^^^^^^^^^^^^^ Add link load ^^^^^^^^^^^^^ Add a new link load which then can be configured. ^^^^^^^^^^^^^^^ Add link spacer ^^^^^^^^^^^^^^^ Add a displacement between the master and slave interface in the link. The displacement is converted internally to force & moment preloads using the link stiffness values. This preload is applied during simulation, so that the displacements are free to act as degrees of freedom. In the absence of external loads, the resulting displacements will be identical to those in the user input. ^^^^^^^^^^^^^^^^^^^^^^^^^^ Add component acceleration ^^^^^^^^^^^^^^^^^^^^^^^^^^ Add a component acceleration load case. For example, an acceleration of -9,81 m/s\ :sup:`2` \ in w-direction defines the gravitational force to the selected component. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add composition acceleration ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add a composition acceleration. The acceleration is used for the whole composition and not for a component only, as in add component acceleration. For example, an acceleration of -9,81 m/s\ :sup:`2` \ in w-direction defines the gravitational force to the composition. ^^^^^^^^^^^^^^^^^^^^^^ Add controller command ^^^^^^^^^^^^^^^^^^^^^^ Add a controller command load. Either a position or a velocity command value can be defined acting on the selected controller. ^^^^^^^^^^^^^^^^ Add rail profile ^^^^^^^^^^^^^^^^ Add a rail profile to a moving interface. This load adds a displacement between master and slave interface depending on the position of the carriage along the rail. The profile displacments are handled in the same manner as with link spacers (internal conversion to force & moment preloads using link stiffnesses). The corresponding displacement degrees of freedom will be equal to the input values only when no external load is present. """"""""""""""""""""""" Average over car length """"""""""""""""""""""" This option enables & disables the carriage length averaging. This affects the profile load’s normal translational displacement (in direction of the *profile normal* dir vector, see below) and the pitch rotational displacement (around the axis normal to the travel direction and *profile normal dir*). The behaviour is as follows: ======== ============================================================================ ======================================================================================== Option Normal Translation Displacement Input Pitch Rotation Displacement Input ======== ============================================================================ ======================================================================================== Off taken directly from the profile value at the centre of the carriage always zero (i.e., the resulting preload moment is also always zero) On averaged over the entire carriage length (using 20 sampling points) derived using a profile trendline along the carriage length (using 20 sampling points) ======== ============================================================================ ======================================================================================== """"""""""""""""""""""""""""""""""""" Selected component and rail interface """"""""""""""""""""""""""""""""""""" Select the component and the rail where the profile should be added. """""""""""""""""" Profile normal dir """""""""""""""""" Define the normal direction of the rail profile. """""""""""""" Link selection """""""""""""" Select the link between rail and carriage to which the displacement should be added. """""""""" Edit table """""""""" Define rail profile using excel or the table directly. ========= =============================================================== Step Action ========= =============================================================== 1 Click on *Table* 2 Right-click into newely opened table and click on *Copy header* 3 Open Excel and paste the header in a new sheet 4 Define the time steps in the *Time* column 5 Define the values at every time step in the *Value* column 6 Copy the whole table including the header *Time* and *Value* 7 Right-click into the MORe-Table and click on *Paste* 8 Click on *Plot* to check if table was copied correctly ========= =============================================================== Additionally, the number in *Number of rows* can be changed. This allows to directly define the transient load data in the table. Important: The headers of the table imported from Excel have to match the ones given in the MORe-Table. Furthermore, tables that have more than 1000 rows can not be copied into MORe. """"""""""" Import data """"""""""" Import the rail profile from a .mat file. ========= =============================================================== Step Action ========= =============================================================== 1 Open matlab and define a vector of name or *var* which stores the time steps 2 Define a vector that stores the load data for every time step 3 Select both vectors and save them in a .mat file 4 Right-click on *load_case_data* and click on *Import data* 5 Select the .mat file 6 Click on *Plot* to check if table was copied correctly ========= =============================================================== Important: In the .mat file there has to be a vector called *var*, otherwise the import will not work. ^^^^ Hint ^^^^ By right-clicking on the number in the first column, the load can be deleted. -------------------- Solver configuration -------------------- ^^^^^^^^^^^^^^^^ Initial/End time ^^^^^^^^^^^^^^^^ Define the start and end time of the transient simulation. ^^^^^^^^^^^ Solver type ^^^^^^^^^^^ Two different solvers are present. The default solver is radau. ^^^^^^^^^^^^^^^^^^^^ Numerical parameters ^^^^^^^^^^^^^^^^^^^^ Define the numerical properties of the solver. -------------------------- Adding transient load data -------------------------- By right-clicking on the transient analysis and by clicking on *add load data* the time variant load data can be defined. Select the desired load case in the *Entity* field. This load case has to be defined in advance. There are two ways of importing transient load data. For simple transient load cases the using the table more convenient. For more complex load cases use the import. ^^^^^^^^^^^ Using table ^^^^^^^^^^^ ========= =============================================================== Step Action ========= =============================================================== 1 Click on *Table* 2 Right-click into newely opened table and click on *Copy header* 3 Open Excel and paste the header in a new sheet 4 Define the time steps in the *Time* column 5 Define the values at every time step in the *Value* column 6 Copy the whole table including the header *Time* and *Value* 7 Right-click into the MORe-Table and click on *Paste* 8 Click on *Plot* to check if table was copied correctly ========= =============================================================== Additionally, the number in *Number of rows* can be changed. This allows to directly define the transient load data in the table. Important: The headers of the table imported from Excel have to match the ones given in the MORe-Table. Furthermore, tables that have more than 1000 rows can not be copied into MORe. ^^^^^^^^^^^^ Using import ^^^^^^^^^^^^ ========= =============================================================== Step Action ========= =============================================================== 1 Open matlab and define a vector of name *time* or *var* which stores the time steps 2 Define a vector that stores the load data for every time step 3 Select both vectors and save them in a .mat file 4 Right-click on *load_case_data* and click on *Import data* 5 Select the .mat file 6 Click on *Plot* to check if table was copied correctly ========= =============================================================== Important: In the .mat file there has to be a vector called *time* or *var*, otherwise the import will not work. ----------------- Start calculation ----------------- Start the calculation.