Overview | Statement List | Example

Bounded by Sheets

Synopsis

ANLSIS/VOLBND,d[,ACCRCY,a|,TOLER,t],obj list,{LBIN|LBFT|GCM|KGM},variable list

Decsription

Analyzes a solid volume bounded by sheet bodies. The volume "inside" the set of sheet bodies is analyzed to calculate a series of numerical values such as volume, center of mass, etc. The sheet face normals define which side of the sheet face is inside or outside. The normals should point toward the outside of the bounded region.

When the sheet body is created, the sheet face normal may not point in the desired direction. The direction can be edited using the RENORM statement.

Parameters

Parameter	Description
VOLBND	Minor word which indicates that an analysis of the volume bounded by sheets is desired.
d	The density per unit volume for the material required.
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 to be 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) – Area t(2) – Volume t(3) – First Moment in the XC Direction t(4) – First Moment in the YC Direction t(5) – First Moment in the ZC Direction t(6) – Moment of Inertia About XC Axis t(7) – Moment of Inertia About YC Axis t(8) – Moment of Inertia About ZC Axis t(9) – YC-ZC Product of Inertia t(10) – XC-ZC Product of Inertia t(11) – 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	The sheet bodies bounding the volume. NOTE: The sheet body face normals must be oriented toward the outside of the volume. To reorient normals which are directed toward the center of the volume, use the RENORM statement.
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 is assigned values as shown in the following table.

Analysis	Acronym	Variable
Area		n(1)
Volume		n(2)
Mass		n(3)
Center of mass	XCBAR	n(4)
Center of mass	YCBAR	n(5)
Center of mass	ZCBAR	n(6)
First moment	MXC	n(7)
First moment	MYC	n(8)
First moment	MZC	n(9)
Moment of inertia-work	IXXW	n(10)
Moment of inertia-work	IYYW	n(11)
Moment of inertia-work	IZZW	n(12)
Moment of inertia-centroidal	IXX	n(13)
Moment of inertia-centroidal	IYY	n(14)
Moment of inertia-centroidal	IZZ	n(15)
Spherical moment of inertia		n(16)
Product of inertia-work	PYZW	n(17)
Product of inertia-work	PXZW	n(18)
Product of inertia-work	PXYW	n(19)
Product of inertia-centroidal	PYZ	n(20)
Product of inertia-centroidal	PXZ	n(21)
Product of inertia-centroidal	PXY	n(22)
Principal axis	XPX	n(23)
Principal axis	XPY	n(24)
Principal axis	XPZ	n(25)
Principal axis	YPX	n(26)
Principal axis	YPY	n(27)
Principal axis	YPZ	n(28)
Principal axis	ZPX	n(29)
Principal axis	ZPY	n(30)
Principal axis	ZPZ	n(31)
Principal moment of inertia	IXXP	n(32)
Principal moment of inertia	IYYP	n(33)
Principal moment of inertia	IZZP	n(34)
Radius of gyration-work	RGXW	n(35)
Radius of gyration-work	RGYW	n(36)
Radius of gyration-work	RGZW	n(37)
Radius of gyration-centroidal	RGX	n(38)
Radius of gyration-centroidal	RGY	n(39)
Radius of gyration-centroidal	RGZ	n(40)
Spherical radius of gyration		n(41)
Density		n(42)