Obsah

name.iR

name.iR

Program

HFRO

Format

; program control IP 0 KDAMP RP PIVAL SHIFT TSTEP

; end of input data EN EN

Annotations

$\mathtt{KDAMP}$	The key of dumping.
	$=0$	no dumping
	$=1$	include dumping (the dumping matrices are read from the binary file `name.AMP`)
$\mathtt{PIVAL}$	The minimum allowed pivot value. The default value is $10^{-6}.$
$\mathtt{SHIFT}$	In the eigenproblem solution of a free (or insufficiently supported) body, it is advisable to choose the value of $\mathtt{SHIFT}$ close to the smallest nonzero eigenvalue; if it is not known, then choose $\mathtt{SHIFT}\approx10^4.$
$\mathtt{TSTEP}$	The integration step of the Newmark metod $[\text{s}].$

The program works as follows:

If $\mathtt{SHIFT}>0,$ the program automatically sets $\mathtt{TSTEP}=\mathtt{KDAMP}=0$ and factorizes the matrix $\sum(\mathbf{K}+\mathtt{SHIFT}\cdot\mathbf{M}).$ It is assumed that this matrix is regular and can be factorized without any pivoting.

If $\mathtt{TSTEP}>0,$ the program determines $a_0,$ $a_1$ and factorizes the positive-definite matrix $\sum(\mathbf{K}+a_0\mathbf{M}+a_1\mathbf{C}).$