71cdd8c59a
at all is that this method is meant to be deprecated. But if it doesn't say that, and there's no generic replacement at all, then it's rather pointless. - simplify parameter initialization (The old code copied from Instrumentation/ but has been simplified there in the same manner a few months ago The new method is less picky about additional nodes ane outputs less pointless alerts. If there shall really be a check for that, then this should be a separate function. But it's nowhere else done in fgfs.
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
// vacuum.cxx - a vacuum pump connected to the aircraft engine.
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// Written by David Megginson, started 2002.
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//
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// This file is in the Public Domain and comes with no warranty.
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "vacuum.hxx"
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#include <Main/fg_props.hxx>
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VacuumSystem::VacuumSystem ( SGPropertyNode *node )
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:
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_name(node->getStringValue("name", "vacuum")),
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_num(node->getIntValue("number", 0)),
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_scale(node->getDoubleValue("scale", 1.0))
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{
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for ( int i = 0; i < node->nChildren(); ++i ) {
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SGPropertyNode *child = node->getChild(i);
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if (!strcmp(child->getName(), "rpm"))
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_rpms.push_back(child->getStringValue());
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}
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}
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VacuumSystem::~VacuumSystem ()
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{
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}
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void
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VacuumSystem::init()
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{
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unsigned int i;
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string branch;
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branch = "/systems/" + _name;
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SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
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_serviceable_node = node->getChild("serviceable", 0, true);
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for ( i = 0; i < _rpms.size(); i++ ) {
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SGPropertyNode_ptr _rpm_node = fgGetNode(_rpms[i].c_str(), true);
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_rpm_nodes.push_back( _rpm_node );
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}
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_pressure_node = fgGetNode("/environment/pressure-inhg", true);
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_suction_node = node->getChild("suction-inhg", 0, true);
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}
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void
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VacuumSystem::bind ()
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{
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}
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void
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VacuumSystem::unbind ()
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{
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}
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void
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VacuumSystem::update (double dt)
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{
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// Model taken from steam.cxx
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double suction;
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unsigned int i;
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if (!_serviceable_node->getBoolValue()) {
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suction = 0.0;
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} else {
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// select the source with the max rpm
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double rpm = 0.0;
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for ( i = 0; i < _rpm_nodes.size(); i++ ) {
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double tmp = _rpm_nodes[i]->getDoubleValue() * _scale;
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if ( tmp > rpm ) {
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rpm = tmp;
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}
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}
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double pressure = _pressure_node->getDoubleValue();
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// This magic formula yields about 4 inhg at 700 rpm
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suction = pressure * rpm / (rpm + 4875.0);
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// simple regulator model that clamps smoothly to about 5 inhg
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// over a normal rpm range
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double max = (rpm > 0 ? 5.39 - 1.0 / ( rpm * 0.00111 ) : 0);
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if ( suction < 0.0 ) suction = 0.0;
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if ( suction > max ) suction = max;
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}
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_suction_node->setDoubleValue(suction);
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}
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// end of vacuum.cxx
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