private function calculate()
{
$mand = 0;
if (argv::string_abort()) {
argv::remove("spring_L");
argv::remove("spring_b");
argv::remove("spring_t");
argv::remove("spring_n");
argv::remove("spring_n1");
argv::remove("spring_F");
argv::remove("spring_s");
argv::remove("spring_type");
}
$L = argv::spring_L();
$b = argv::spring_b();
$t = argv::spring_t();
$n = argv::spring_n();
$n1 = argv::spring_n1();
$F = argv::spring_F();
$s = argv::spring_s();
$type = argv::spring_type();
$F = $F / 2;
$L = $L / 2;
$E = 200000;
// set mandatory fields
$this->content->leaf_length_class = "mand";
$this->content->leaf_width_class = "mand";
$this->content->leaf_thickness_class = "mand";
$this->content->leaf_count_class = "mand";
// calculation started
if (argv::spring_calc()) {
$this->content->action = "calculate";
// check mandatory fields
if (!$L) {
$this->content->leaf_length_class = "mand_missing";
} else {
$mand++;
}
if (!$b) {
$this->content->leaf_width_class = "mand_missing";
} else {
$mand++;
}
if (!$t) {
$this->content->leaf_thickness_class = "mand_missing";
} else {
$mand++;
}
if (!$n) {
$this->content->leaf_count_class = "mand_missing";
} else {
$mand++;
}
}
// calculate leaf lenghs
if ($L and $n) {
$Lxg = 0;
// add additional leafs
if ($n1) {
$Lxg = $n1 * $L;
}
for ($x = 0; $x < $n; $x++) {
$Lx = 2 * $L * (1 - $x / $n);
$Lxg += $Lx;
$this->content->addChild("leaf_length_list", $Lx);
}
$this->content->addChild("leaf_length_overall", $Lxg);
}
// set result values
$this->content->result = "---";
$this->content->spring_result_class = "spring_result_error";
// set result type
if ($F) {
$this->content->result_value = "s";
$this->content->result_unit = "mm";
$this->text("result_name", "bending");
$this->content->spring_result_class = "spring_result";
}
if ($s) {
$this->content->result_value = "F";
$this->content->result_unit = "N";
$this->text("result_name", "force");
$this->content->spring_result_class = "spring_result";
}
// abbort if not mandatory
if ($mand < 4) {
return FALSE;
}
// PSI
$psi = 3 / (2 + ($n1 + $type) / $n);
//------------------------------------------------------------------------------
// calculate bending
if ($F) {
// s denominator
$_s = $E * $n * $b * pow($t, 3);
// if s not NULL -> calculate
if ($_s) {
$s = $psi * 4 * $F * pow($L, 3) / $_s;
}
$this->content->result = number_format($s, 3);
} elseif ($s) {
// F denominator
$_F = 4 * pow($L, 3) * $psi;
// if F not NULL -> calculate
if ($_F) {
$F = $s * $E * $n * $b * pow($t, 3) / $_F;
}
$this->content->result = number_format($F, 3);
}
// sigma
$this->content->spring_sigma = number_format(6 * $F * $L / ($n * $b * pow($t, 2)));
// echoall($this->content);
}
