This
function allows the user to define, read in, or modify Motion and/or Force load
curves. As shown in Figure 10.2.4, the user can define the curve
type by toggling on either checkbox of Motion or Force. The Motion curve allows
the user to define the tool movement via velocity or displacement control,
while the Force curve allows user to define a given force applied onto a
tool. If both the Motion and Force curves
are defined for a tool, the Motion curve will overwrite the Force curve
control. However, the force control can be activated if a death time is set for
the Motion curve (the default death time is the termination time of the Motion curve).
Figure 10.2.4 Tool Load Curve dialog box
SHOW CURVE
Display the load curve on the eta/DYNAFORM
display area. It also provides many options for viewing the graph.
ASSIGN CURVE
This function is used to assign a motion/force load curve to a tool from the list of defined load curves in the Select Curve dialog box. As shown in Figure 10.2.5, the user can select a particular load curve from the list. Click on the OK to button to confirm the selection and to complete the Assign Curve operation.
Figure 10.2.5 List Curve
READ
Allow the user to read in an external load
curve using the window in Figure 10.2.6.
Figure 10.2.6 Read Curve File
AUTO
This function is used to generate a velocity/displacement/force load curve. If the Motion option is checked, the Motion Curve dialog box illustrated in Figure 10.2.7 is displayed.
Figure 10.2.7 Auto Motion Curve dialog box
The Motion Curve dialog box enables the user to
define either the velocity or the displacement load curve according to the
begin time, velocity/displacement and stroke distance. If the Velocity checkbox
is toggled on, the load curve is plotted as velocity versus time. The Displacement
option enables the user to plot a displacement versus time load curve. The load
curves can be plotted in one of the 3 different types of curve shapes as listed
below:
TRAPEZOIDAL
– Simplified discrete load curve (recommended).
SINUSOIDAL
– Smooth discrete load curve.
SINUSOINAL WITH HOLD – Smooth discrete load curve with the maximum velocity held constant
for a period of time.
After
selecting the desired curve shape, the user does the following steps:
·
Input
the data fields of Begin Time, Velocity, and Stroke Distance.
·
Select
No if there is more than one travel phase in the curve, following by selecting
curve shape and input the values for a second travel phase in the data fields
accordingly.
·
Select
Yes to create the motion curve. A dialog box showing the motion curve is
displayed. Refer to Section 14.14.8, Utilities / Load Curve / Show
Load Curve.
·
If
Force Curve is checked, the Force/Time Curve dialog box (as shown in Figure 10.2.8) is displayed.
Figure 10.2.8 Auto Force Curve dialog box
·
Input
values in the data fields of Begin Time, Force, and End Time. The default end
time is the end time of motion curve.
·
Select
OK to create the force curve. A dialog box showing the force curve is displayed.
Refer to Section 14.14.8, Utilities / Load Curves / Show
Load Curve.
REMOVE
This function is used to remove the applied load curve. If the Remove button is clicked, a warning message (as shown in Figure 10.2.9) is displayed. The user selects either Yes/No to accept/reject the operation.
Figure 10.2.9 eta/DYNAFORM Question dialog box
MODIFY
This function is used to edit the current
curve. Refer to Section 14.14.4 for more details.
MANUAL
This function is used to manually create a
curve by input data points. The dialog box is shown in Figure 10.2.10.
The steps listed below are used to manually generate load curve:
·
Select
Velocity or Displacement option.
·
Input
Time and Value (velocity or displacement).
·
Select
Add Point to add next data points.
·
Select
OK to complete curve definition and exit the Input Curve dialog box.
Figure 10.2.10 Input Curve dialog box