With the Local Trend Graph PropertyManager, you can
gain insight into the relation between an objective or constraint (dependent variables) and
specific design variables (independent variables).
To display the Local Trend Graph
PropertyManager:
From the left frame of a Design Study tab, right-click Results and Graphs
, and click Define Local Trend Graph.
The table summarizes the availability of the Local Trend Graph for Optimization and
Design Studies.
Types of Variables |
Optimization Studies |
Design Studies |
- Continuous variables within range
- Results quality = High quality
|
Local Trend Graph is available |
NA |
- Continuous variables within range
- Results quality = Fast results
|
Local Trend Graph is available |
NA |
- Discrete Variables
- Results quality = High quality
|
NA |
NA |
- Discrete Variables
- Results quality = Fast Results
|
Local Trend Graph is available |
Local Trend Graph is available |
- Combination of Discrete and Continuous Variables within range
- Results quality = High quality
|
Local Trend Graph is available |
NA |
- Combination of Discrete and Continuous Variables within range
- Results quality = Fast Results
|
Local Trend Graph is available |
NA |
A local trend graph provides an insight as to the change in value of an
objective or constraint (dependent variable) within a permissible range of the independent
design variables.
The independent value of the design variable is plotted for the selected
iteration. The graph shows the trend of the dependent variable (objective or goal) as the
independent variable varies within the permissible range.
An ascending concave curve would indicate that for the values in the neighborhood of the
selected variable, the value of a constraint or objective is increasing, and the rate of
change is also increasing. This could indicate a strong correlation between the design
variable and the constraint or objective. A descending concave graph would indicate a
downward trend, while also giving insight as to the strength of any correlation. A flat
horizontal line may indicate that there is no correlation between a change in the variable
value and the constraint or objective values.
The local trend graph does not show the values of the dependent design
variable at each iteration.
Design Variables (X-Axis)
Select one design variable to plot along the X-axis. The range of values
are dependent on the selected iteration.
Y-Axis
Objective |
Select the design objective (or goal) to plot on
the Y-axis. |
Constraint |
Select one constraint to plot on the
Y-axis. |
Normalized to initial
value |
Plots the ratio of the objective or constraint
variable value to its initial value from the initial scenario. |
Local trend
at |
The permissible range of values for the design
variable is dependent on the selected iteration. |