Contents - Index


Uncertainty and UncertaintyTable (Macro Commands)

 

Uncertainty  h, Q, T_s=A1.5, Vel=R0.01 T_inf=Au_Tinf

Initiate the Uncertainty Propagation calculations to determine the uncertainty in variables h and Q as a result of uncertainties in variables T_s, Vel and T_infinity.  Note that measured values are identified with an =A or =R following their name.  In this example, the uncertainty in variable T_s is 1.5 on an absolute (A) basis.  The uncertainty in variable Vel is 0.01 of its current value (relative basis).  The absolute uncertainty in variable T_inf is equal to the value of variable u_Tinf, which must be set to a constant in the Equations window.  Note that the designation Ru_Tinf would set the uncertainty of variable T_inf in a relative manner so that its uncertainty would be the product of its current value and the value of u_Tinf.

 

UncertaintyTable /S /U /R 'Table 1' Rows=1..10  h, Q, T_s=A1, Vel=R0.01 T_inf=Au_Tinf

Initiate the UncertaintyTable calculations to determine the uncertainty in variables h and Q as a result of uncertainties in variables T_s, Vel, and T_inf. Measured variables (here T_s, Vel and T_inf) are identified with =A or =R following their names. A indicates absolute uncertainty and R indicates relative uncertainty.  The absolute or relative uncertainty is indicated with a numerical value or with a variable name following the A or R.  Note that if a variable is name is indicated, the variable must be set to a value in the Equations window or in the Parametric table.  Variables without an = following their name are assumed to be calculated values.   All of the variables should be in the specified Parametric Table.  If /U is provided, the guess values will be updated after each row of the table successfully completes calculations.  If /R is provided the calculations will be start on the last row and proceed to the first row of the specified range.  If /S is provided the calculations will stop if an error is encountered and remaining rows of the table will not be processed.

 

MacroCommands