nastran manual


Tables

MENU SEQUENCE:

 


Defines a new table of interpolation values used for dynamic loads.

Figure 15 – Tables Window

-Data Entry Section:  In this section it is possible selects which kind of entry user wants to perform. Exists four different types.

-          Single value: Allows to introduce a couple of values (X,Y).

-          Linear Ramp: Permits define a straight line. User has to introduce: Start point (X), value of Y coordinate at start point (Y), End point (To X), value of Y coordinate at end point  (To Y) and increment for coordinate X (Delta X).

-          Equation: It is very similar to Linear Ramp, but in this case, the user can use any kind of function to define the values of Y coordinate. To see which functions are allow and their grammatical look at end of this chapter.

-          Periodic: Permits define a periodic function, it means: a function with the same value for Y coordinate after one period.

-Add Button:  After introduce the desired values to different files it is necessary to click on add button to add the new values in the interpolation table. Exists two possible ways to do this:

-Add at End: The new values are included at the end of the table.

-Add before Selected: The new values are included at the selected point of the table. For use this option is necessary first select a value of the table and after click on Add Button.

 
With this button is possible delete a set of selected entries of the table.

 
With this button is possible get a selected entry (couple of values (X,Y) ) from the table. It is possible do the same with a double click of mouse over the desired entry.


List of math function

abs(arg)

Returns the absolute value of arg.

acos(arg)

Returns the arc cosine of arg, in the range [0,pi] radians. Arg should be in the range [-1,1].

asin(arg)

Returns the arc sine of arg, in the range [-pi/2,pi/2] radians. Arg should be in the range [-1,1].

atan(arg)

Returns the arc tangent of arg, in the range [-pi/2,pi/2] radians.

atan2(x, y)

Returns the arc tangent of y/x, in the range [-pi,pi] radians. x and y cannot both be 0.

ceil(arg)

Returns the smallest integer value not less than arg.

cos(arg)

Returns the cosine of arg, measured in radians.

cosh(arg)

Returns the hyperbolic cosine of arg.

exp(arg)

Returns the exponential of arg, defined as e**arg

floor(arg)

Returns the largest integral value not greater than arg.

fmod(x, y)

Returns the floating-point remainder of the division of x by y.

log(arg)

Returns the natural logarithm of arg. Arg must be a positive value.

log10(arg)

Returns the base 10 logarithm of arg. Arg must be a positive value.

pow(x, y)

Computes the value of x raised to the power y. If x is negative, y must be an integer value.

sin(arg)

Returns the sine of arg, measured in radians.

sinh(arg)

Returns the hyperbolic sine of arg.

sqrt(arg)

Returns the square root of arg. Arg must be non-negative.

tan(arg)

Returns the tangent of arg, measured in radians.

tanh(arg)

Returns the hyperbolic tangent of arg.