Dialog Options
Compute: designates to compute cant, radii, or length.
- Compute Cant - defined by Applied Constant, Applied Cant, Cant Deficiency, Non-compensating Lateral Acceleration, Applied Rate of Change, Deficiency Rate of Change and Cant Gradient.
- Compute Radius - allows you to compute a circular arc's radius from Applied Cant, Applied Rate of Change and Cant Gradient.
- Compute Length - allows you to compute a spiral's length from Applied Rate of Change, Deficiency Rate of Change and Cant Gradient.
- Applied Constant - defines the cant constant for the applied cant (the Applied Constant field).
- Applied Cant - defines the applied cant at the current station and at the next station in the list. The Applied Cant is specified in two values, one for the current station (specified in the Start column) and one for the next station (specified in the Stop column).
- Cant Deficiency - defines the cant deficiency, which is the mathematical difference between equilibrium cant and applied cant. The Cant Deficiency is specified in two values, one for the current station (specified in the Start column) and one for the next station (specified in the Stop column).
- Non-compensating Lateral Acceleration - defines the applied cant by non-compensating lateral acceleration. When you enter a value, all other values are automatically re-computed.
- Applied Rate Change - defines the rate of change of applied cant from the current station to the next station in the list. The Applied Rate Change, a single value, is keyed in in the Start column.
- Deficiency Rate Change - defines the rate of change of cant deficiency from the current station to the next station in the list. The Deficiency Rate Change, a single value, is keyed in in the Start column.
- Applied Cant Gradient - defines the cant gradient from the current station to the next station in the list. The applied cant gradient is the ratio between 1) the difference in cant from the current station to the next and 2) the length of the transition.
Design Speed: specifies the design speed.
Equilibrium Constant: specifies the equilibrium cant constant.
Applied Constant: specifies the applied cant constant.
Radius: specifies the start and end radius of the transition or circular arc.
Length: specifies the length of the transition or circular arc.
Compound Transition Rate From: The Start and Stop radio buttons are available only when the curve set contains a compound transition (unequal and non-zero radii) and Define By is set to either Applied Rate of Change, Deficiency Rate of Change, or Applied Cant Gradient.
The Start and Stop radio buttons determine whether you will specify the Applied Cant at the beginning of the transition (Start) or the end of the transition (Stop) when Define By is set to either Applied Rate of change or Applied Cant Gradient. When Define By is set to Deficiency Rate of Change, the Start and Stop radio buttons determine whether you will specify the Cant Deficiency at the beginning of the transition (Start) or the end of the transition (Stop).
Start: The parameters in the Start column correspond to the beginning of the transition. Parameters that are dithered and in the Start column display values computed at the start of the transition. See the explanation of the Define By parameter for more information.
Stop: The parameters in the Stop column correspond to the end of the transition. Parameters that are dithered and in the Stop column display values computed at the end of the transition. See the explanation of the Define By parameter for more information.
Equilibrium Cant: displays the computed equilibrium cant. The two fields are always dithered.
Applied Cant: specifies the applied cant, when Define By is set to Applied Cant. When the field is dithered, it reports the results of computations.
Cant Deficiency: specifies the cant deficiency, when Define By is set to Cant Deficiency. When the field is dithered, it reports the results of computations.
Non-Compensating Lateral Acceleration: specifies the non-compensating lateral acceleration, in inches per second or millimeters per second, when Define By is set to Non-Compensating lateral acceleration. When the field is dithered, it reports the results of computations.
Applied Rate of Change: specifies the applied rate of change of cant, when Define By is set Applied Rate of Change. When the field is dithered, it reports the results of computations.
Deficiency Rate of Change: specifies the deficiency rate of change, when Define By is set Deficiency Rate of Change. When the field is dithered, it reports the results of computations.
Applied Cant Gradient: specifies the applied cant gradient, when Define By is set Applied Cant Gradient. When the field is dithered, it reports the results of computations.