FGBuoyantForces.cpp

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 Module:       FGBuoyantForces.cpp
 Authors:      Anders Gidenstam, Jon S. Berndt
 Date started: 01/21/08
 Purpose:      Encapsulates the buoyant forces
 
 ------------- Copyright (C) 2008 - 2011  Anders Gidenstam        -------------
 ------------- Copyright (C) 2008  Jon S. Berndt (jon@jsbsim.org) -------------
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free
 Software Foundation; either version 2 of the License, or (at your option) any
 later version.
 
 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 details.
 
 You should have received a copy of the GNU Lesser General Public License along
 with this program; if not, write to the Free Software Foundation, Inc., 59
 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
 Further information about the GNU Lesser General Public License can also be
 found on the world wide web at http://www.gnu.org.
 
FUNCTIONAL DESCRIPTION
--------------------------------------------------------------------------------
 
HISTORY
--------------------------------------------------------------------------------
01/21/08   JSB   Created
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
#include "FGFDMExec.h"
#include "FGBuoyantForces.h"
#include "input_output/FGXMLElement.h"
 
using namespace std;
 
namespace JSBSim {
 
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
FGBuoyantForces::FGBuoyantForces(FGFDMExec* FDMExec) : FGModel(FDMExec)
{
  Name = "FGBuoyantForces";
 
  NoneDefined = true;
 
  vTotalForces.InitMatrix();
  vTotalMoments.InitMatrix();
 
  gasCellJ.InitMatrix();
 
  Debug(0);
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
FGBuoyantForces::~FGBuoyantForces()
{
  for (unsigned int i=0; i<Cells.size(); i++) delete Cells[i];
  Cells.clear();
 
  Debug(1);
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bool FGBuoyantForces::InitModel(void)
{
  if (!FGModel::InitModel()) return false;
 
  vTotalForces.InitMatrix();
  vTotalMoments.InitMatrix();
 
  return true;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bool FGBuoyantForces::Run(bool Holding)
{
  if (FGModel::Run(Holding)) return true;
  if (Holding) return false; // if paused don't execute
  if (NoneDefined) return true;
 
  RunPreFunctions();
 
  vTotalForces.InitMatrix();
  vTotalMoments.InitMatrix();
 
  for (unsigned int i=0; i<Cells.size(); i++) {
    Cells[i]->Calculate(FDMExec->GetDeltaT());
    vTotalForces  += Cells[i]->GetBodyForces();
    vTotalMoments += Cells[i]->GetMoments();
  }
 
  RunPostFunctions();
 
  return false;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bool FGBuoyantForces::Load(Element *document)
{
  Element *gas_cell_element;
 
  Debug(2);
 
  // Perform base class Pre-Load
  if (!FGModel::Upload(document, true))
    return false;
 
  gas_cell_element = document->FindElement("gas_cell");
  while (gas_cell_element) {
    NoneDefined = false;
    Cells.push_back(new FGGasCell(FDMExec, gas_cell_element, Cells.size(), in));
    gas_cell_element = document->FindNextElement("gas_cell");
  }
  
  PostLoad(document, FDMExec);
 
  if (!NoneDefined) {
    bind();
  }
 
  return true;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
double FGBuoyantForces::GetGasMass(void) const
{
  double Gw = 0.0;
 
  for (unsigned int i = 0; i < Cells.size(); i++) {
    Gw += Cells[i]->GetMass();
  }
 
  return Gw;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
const FGColumnVector3& FGBuoyantForces::GetGasMassMoment(void)
{
  vXYZgasCell_arm.InitMatrix();
  for (unsigned int i = 0; i < Cells.size(); i++) {
    vXYZgasCell_arm += Cells[i]->GetMassMoment();
  }
  return vXYZgasCell_arm;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
const FGMatrix33& FGBuoyantForces::GetGasMassInertia(void)
{
  size_t size = Cells.size();
  
  if (size == 0) return gasCellJ;
 
  gasCellJ.InitMatrix();
 
  for (unsigned int i=0; i < size; i++) {
    gasCellJ += Cells[i]->GetInertia();
  }
  
  return gasCellJ;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
string FGBuoyantForces::GetBuoyancyStrings(const string& delimeter)
{
  string CoeffStrings = "";
/*
  bool firstime = true;
  for (sd = 0; sd < variables.size(); sd++) {
    if (firstime) {
      firstime = false;
    } else {
      CoeffStrings += delimeter;
    }
    CoeffStrings += variables[sd]->GetName();
  }
 
  for (axis = 0; axis < 6; axis++) {
    for (sd = 0; sd < AeroFunctions[axis].size(); sd++) {
      if (firstime) {
        firstime = false;
      } else {
        CoeffStrings += delimeter;
      }
      CoeffStrings += AeroFunctions[axis][sd]->GetName();
    }
  }
*/
  return CoeffStrings;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
string FGBuoyantForces::GetBuoyancyValues(const string& delimeter)
{
  string SDValues = "";
/*
  bool firstime = true;
  for (sd = 0; sd < variables.size(); sd++) {
    if (firstime) {
      firstime = false;
    } else {
      SDValues += delimeter;
    }
    SDValues += variables[sd]->GetValueAsString();
  }
 
  for (unsigned int axis = 0; axis < 6; axis++) {
    for (unsigned int sd = 0; sd < AeroFunctions[axis].size(); sd++) {
      if (firstime) {
        firstime = false;
      } else {
        SDValues += delimeter;
      }
      SDValues += AeroFunctions[axis][sd]->GetValueAsString();
    }
  }
*/
  return SDValues;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
void FGBuoyantForces::bind(void)
{
  using PSF = void (FGBuoyantForces::*)(int, double);
  PropertyManager->Tie("moments/l-buoyancy-lbsft", this, eL,
                       &FGBuoyantForces::GetMoments, (PSF)nullptr);
  PropertyManager->Tie("moments/m-buoyancy-lbsft", this, eM,
                       &FGBuoyantForces::GetMoments, (PSF)nullptr);
  PropertyManager->Tie("moments/n-buoyancy-lbsft", this, eN,
                       &FGBuoyantForces::GetMoments, (PSF)nullptr);
  PropertyManager->Tie("forces/fbx-buoyancy-lbs", this, eX,
                       &FGBuoyantForces::GetForces, (PSF)nullptr);
  PropertyManager->Tie("forces/fby-buoyancy-lbs", this, eY,
                       &FGBuoyantForces::GetForces, (PSF)nullptr);
  PropertyManager->Tie("forces/fbz-buoyancy-lbs", this, eZ,
                       &FGBuoyantForces::GetForces, (PSF)nullptr);
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds
 
void FGBuoyantForces::Debug(int from)
{
  if (debug_lvl <= 0) return;
 
  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 2) { // Loader
      cout << endl << "  Buoyant Forces: " << endl;
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: FGBuoyantForces" << endl;
    if (from == 1) cout << "Destroyed:    FGBuoyantForces" << endl;
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
    }
  }
}
 
} // namespace JSBSim