486b59a431
Annexed an IVSI (instantaneous ertical speed indicator), which bypasses a
limitation with Concorde :
- the cruise at Mach 2 must be with a slow climb rate of 50/60 ft/min
(2h from 50000 ft).
- with /velocities/vertical-speed-fpm, the real climb rate (altimeter) varies :
One must constantly (every 5-10 minutes) change the vertical speed hold of
the autopilot between 10 ft/min and 200 ft/min.
This is very annoying because not a constant offset : that could be a lack of
sensitivity of /velocities/vertical-speed-fpm (FDM ?).
This new IVSI :
- Is an emulation with works with environment pressure : a real IVSI works with
static pressure (with lag) + accelerometers.
It is not forbidden to later upgrade to the real model.
- Doesn't require a tuning of the autopilot made with
/velocities/vertical-speed-fpm (also tested with 737, 747) :
Concorde's autoland works without update.
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
// inst_vertical_speed_indicator.hxx -- Instantaneous VSI (emulation calibrated to standard atmosphere).
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//
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// Started September 2004.
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//
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// Copyright (C) 2004
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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#ifndef __INST_VERTICAL_SPEED_INDICATOR_HXX
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#define __INST_VERTICAL_SPEED_INDICATOR_HXX 1
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <simgear/props/props.hxx>
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#include <simgear/structure/subsystem_mgr.hxx>
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class SGInterpTable;
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/**
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* Model an instantaneous VSI tied to the external pressure.
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*
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* Input properties:
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*
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* /instrumentation/inst-vertical-speed-indicator/serviceable
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* /environment/pressure-inhg
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* /environment/pressure-sea-level-inhg
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* /sim/speed-up
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* /sim/freeze/master
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*
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* Output properties:
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*
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* /instrumentation/inst-vertical-speed-indicator/indicated-speed-fps
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* /instrumentation/inst-vertical-speed-indicator/indicated-speed-fpm
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*/
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class InstVerticalSpeedIndicator : public SGSubsystem
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{
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public:
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InstVerticalSpeedIndicator ( SGPropertyNode *node );
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virtual ~InstVerticalSpeedIndicator ();
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virtual void init ();
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virtual void update (double dt);
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private:
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double _internal_pressure_inhg;
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double _internal_sea_inhg;
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double _speed_ft_per_s;
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string name;
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int num;
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SGPropertyNode_ptr _serviceable_node;
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SGPropertyNode_ptr _freeze_node;
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SGPropertyNode_ptr _pressure_node;
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SGPropertyNode_ptr _sea_node;
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SGPropertyNode_ptr _speed_up_node;
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SGPropertyNode_ptr _speed_node;
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SGPropertyNode_ptr _speed_min_node;
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SGInterpTable * _pressure_table;
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SGInterpTable * _altitude_table;
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};
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#endif // __INST_VERTICAL_SPEED_INDICATOR_HXX
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