Parameter
Description
SHELL
Minor word which indicates that a thin shell analysis is desired.
d
The density per unit area, for the material required, which is equal to the density per unit volume multiplied by the desired thickness of the thin shell.
ACCRCY
Optional minor word indicating that the following parameter is a numerical value representing the accuracy used to perform the calculation.
a
A numeric variable which represents the accuracy used to perform the calculations. The allowable range is between 0 and 1. The nearer the accuracy parameter is to 1, the more accurate is the analysis; however, the speed of the calculation is reduced. If this parameter is not specified, the system defaults to 0.9. Note that this is not a distance tolerance.
TOLER
An optional minor word which indicates that a tolerance value is used to limit the amount of error when calculating the mass property value.
t
An array of one or eleven numerical tolerances which represents the percentage of error you wish to allow when calculating the mass properties. Any array not containing one or eleven elements produces the following error message:
Invalid Tolerance Dimension
If a single value is specified, it is used for all calculations. If multiple values are specified, they are used to perform calculations as follows:
t(1) 每 Area
t(2) 每 Volume
t(3) 每 First Moment in the XC Direction
t(4) 每 First Moment in the YC Direction
t(5) 每 First Moment in the ZC Direction
t(6) 每 Moment of Inertia About XC Axis
t(7) 每 Moment of Inertia About YC Axis
t(8) 每 Moment of Inertia About ZC Axis
t(9) 每 YC-ZC Product of Inertia
t(10) 每 XC-ZC Product of Inertia
t(11) 每 XC-YC Product of Inertia
The tolerance values are the percent relative tolerance of error. For example, if you wanted your relative error to be no more than five percent, then you would enter a tolerance value of 5.0. See the following formula:
A tolerance value of 0.0 for any of the properties means that no tolerance is to be used in calculating that property. However, specifying a tighter tolerance for any of the mass properties should mean more accuracy for all of the mass properties, even if you do not specify a tolerance for each property.
Default tolerance values are 1.0 (1%) for area and volume, and 0.0 for the others.
obj list
A collection of sheet body objects which do not have to be connected or to enclose a volume.
LBIN
Minor word which indicates that the units of the analysis results are to be pounds and inches.
LBFT
Minor word which indicates that the units of the analysis results are to be pounds and feet.
GCM
Minor word which indicates that the units of the analysis results are to be grams and centimeters.
KGM
Minor word which indicates that the units for the analysis results are to be kilograms and meters.
variable list
A numeric array that are assigned values as shown in the following table.