1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
7 ------------- Copyright (C) 1999 Anthony K. Peden (apeden@earthlink.net) -------------
9 This program is free software; you can redistribute it and/or modify it under
10 the terms of the GNU Lesser General Public License as published by the Free Software
11 Foundation; either version 2 of the License, or (at your option) any later
14 This program is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
19 You should have received a copy of the GNU Lesser General Public License along with
20 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21 Place - Suite 330, Boston, MA 02111-1307, USA.
23 Further information about the GNU Lesser General Public License can also be found on
24 the world wide web at http://www.gnu.org.
28 --------------------------------------------------------------------------------
32 FUNCTIONAL DESCRIPTION
33 --------------------------------------------------------------------------------
35 The purpose of this class is to provide storage for computed forces and
36 encapsulate all the functionality associated with transforming those
37 forces from their native coord system to the body system. This includes
38 computing the moments due to the difference between the point of application
43 #include <FGFDMExec.h>
44 #include <models/FGAircraft.h>
45 #include <models/FGPropagate.h>
46 #include <models/FGMassBalance.h>
52 static const char *IdSrc = "$Id$";
53 static const char *IdHdr = ID_FORCE;
55 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
57 FGForce::FGForce(FGFDMExec *FDMExec) :
61 mT(1,1) = 1; //identity matrix
68 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
75 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
77 FGColumnVector3& FGForce::GetBodyForces(void)
79 vFb = Transform()*vFn;
81 // Find the distance from this vector's acting location to the cg; this
82 // needs to be done like this to convert from structural to body coords.
83 // CG and RP values are in inches
85 vDXYZ = fdmex->GetMassBalance()->StructuralToBody(vActingXYZn);
92 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
94 FGMatrix33 FGForce::Transform(void)
98 return fdmex->GetState()->GetTs2b();
100 return fdmex->GetPropagate()->GetTl2b();
105 cout << "Unrecognized tranform requested from FGForce::Transform()" << endl;
110 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
112 void FGForce::UpdateCustomTransformMatrix(void)
114 double cp,sp,cr,sr,cy,sy;
116 cp=cos(vOrient(ePitch)); sp=sin(vOrient(ePitch));
117 cr=cos(vOrient(eRoll)); sr=sin(vOrient(eRoll));
118 cy=cos(vOrient(eYaw)); sy=sin(vOrient(eYaw));
124 mT(2,1) = sr*sp*cy - cr*sy;
125 mT(2,2) = sr*sp*sy + cr*cy;
128 mT(3,1) = cr*sp*cy + sr*sy;
129 mT(3,2) = cr*sp*sy - sr*cy;
134 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
136 void FGForce::SetAnglesToBody(double broll, double bpitch, double byaw)
138 if (ttype == tCustom) {
139 vOrient(ePitch) = bpitch;
140 vOrient(eRoll) = broll;
141 vOrient(eYaw) = byaw;
143 UpdateCustomTransformMatrix();
147 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
148 // The bitmasked value choices are as follows:
149 // unset: In this case (the default) JSBSim would only print
150 // out the normally expected messages, essentially echoing
151 // the config files as they are read. If the environment
152 // variable is not set, debug_lvl is set to 1 internally
153 // 0: This requests JSBSim not to output any messages
155 // 1: This value explicity requests the normal JSBSim
157 // 2: This value asks for a message to be printed out when
158 // a class is instantiated
159 // 4: When this value is set, a message is displayed when a
160 // FGModel object executes its Run() method
161 // 8: When this value is set, various runtime state variables
162 // are printed out periodically
163 // 16: When set various parameters are sanity checked and
164 // a message is printed out when they go out of bounds
166 void FGForce::Debug(int from)
168 if (debug_lvl <= 0) return;
170 if (debug_lvl & 1) { // Standard console startup message output
171 if (from == 0) { // Constructor
175 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
176 if (from == 0) cout << "Instantiated: FGForce" << endl;
177 if (from == 1) cout << "Destroyed: FGForce" << endl;
179 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
181 if (debug_lvl & 8 ) { // Runtime state variables
183 if (debug_lvl & 16) { // Sanity checking
185 if (debug_lvl & 64) {
186 if (from == 0) { // Constructor
187 cout << IdSrc << endl;
188 cout << IdHdr << endl;