Generalized Space Function

Function

Define a spatial function which is used to apply location-varying load and boundary conditions.

A function can be defined by filling the table on the left or by writing a numerical equation on the right. The value between two inputs will be determined by linear interpolation.

Call

 Model > Generalized Space Function

<Create/Modify Function>

Name

Enter the name of the function and choose the Global Rectangular coordinate system.
 

Ref. Csys

Selected the reference coordinate system of the function.

Select Variable

Select the variable in the function.
 

Equation

Write a numerical equation to define the function.
 

Value

Enter the function value in each direction X, Y, Z.

(To define the function, the independent variable or function value can be directly entered into the left table. Moreover, a formula can be directly entered into the corresponding dialog box. In both cases, the values of the independent variables will be calculated by linear interpolation.)

The resultant three-dimensional distribution corresponds to the product of the three functions defined by the user: F(X,Y,Z) = f(X) * g(Y) * h(Z)

Note 1: This option is limited to the application of pressure loads only.

Note 2: The values defined in the Generalized Function dialog are dimensionless. It is therefore advised to define a normalized function for each direction (maximum value =1)and then enter the actual maximum pressure value (stress unit) in the P input box of the Pressure Load dialog.

<Example>

(1) In the rectangular coordinate system, define a function of 2*X^2 from X=0 to X=100 with an increment of 5;

From: 0, To: 100, Inc: 5, Value: 2*X^X

(2) In the cylindrical coordinate system, define a function of sin(T) from T=0 to T=360 with an increment of 10;

From: 0, To: 360, Inc: 10, Value: sin(T)

Calculate

Fill out the table on the left based on the equation defined in Value.
 

Scale Value

Enter a scale factor which will be multiplied by the original function value.
 

Reset

Reset all function definitions including variable and value.
 

Extrapolation

Select a method to calculate values which exceed defined domain.

Set to Zero

Assignment of zero is declared.

Closest Value

Assignment of an approximate value.

Linear Extrapolation

Assignment using linear extrapolation
 

<Extrapolation>