/**
* Constructs a global optimization problem (box-bounded, continuous) representing an interplanetary trajectory modelled
* as a Multiple Gravity Assist trajectory that allows one only Deep Space Manouvre between each leg.
*
* @param[in] seq std::vector of kep_toolbox::planet_ptr containing the encounter sequence for the trajectoty (including the initial planet)
* @param[in] t0_l kep_toolbox::epoch representing the lower bound for the launch epoch
* @param[in] t0_u kep_toolbox::epoch representing the upper bound for the launch epoch
* @param[in] tof time-of-flight vector containing lower and upper bounds (in days) for the various legs time of flights
* @param[in] Tmax maximum time of flight
* @param[in] Dmin minimum distance from Jupiter (for radiation protection)
*
* @throws value_error if the planets in seq do not all have the same central body gravitational constant
* @throws value_error if tof has a size different from seq.size()
*/
mga_incipit_cstrs::mga_incipit_cstrs(
const std::vector<kep_toolbox::planets::planet_ptr> seq,
const kep_toolbox::epoch t0_l,
const kep_toolbox::epoch t0_u,
const std::vector<std::vector<double> > tof,
double Tmax,
double Dmin) : base(4*seq.size(),0,1,2,2,1E-3), m_tof(tof), m_tmax(Tmax), m_dmin(Dmin)
{
// We check that all planets have equal central body
std::vector<double> mus(seq.size());
for (std::vector<kep_toolbox::planets::planet_ptr>::size_type i = 0; i< seq.size(); ++i) {
mus[i] = seq[i]->get_mu_central_body();
}
if ((unsigned int)std::count(mus.begin(), mus.end(), mus[0]) != mus.size()) {
pagmo_throw(value_error,"The planets do not all have the same mu_central_body");
}
// We check the consistency of the time of flights
if (tof.size() != seq.size()) {
pagmo_throw(value_error,"The time-of-flight vector (tof) has the wrong length");
}
for (size_t i = 0; i < tof.size(); ++i) {
if (tof[i].size()!=2) pagmo_throw(value_error,"Each element of the time-of-flight vector (tof) needs to have dimension 2 (lower and upper bound)");
}
// Filling in the planetary sequence data member. This requires to construct the polymorphic planets via their clone method
for (std::vector<kep_toolbox::planets::planet_ptr>::size_type i = 0; i < seq.size(); ++i) {
m_seq.push_back(seq[i]->clone());
}
// Now setting the problem bounds
size_type dim(4*m_tof.size());
decision_vector lb(dim), ub(dim);
// First leg
lb[0] = t0_l.mjd2000(); ub[0] = t0_u.mjd2000();
lb[1] = 0; lb[2] = 0; ub[1] = 1; ub[2] = 1;
lb[3] = m_tof[0][0]; ub[3] = m_tof[0][1];
// Successive legs
for (std::vector<kep_toolbox::planets::planet_ptr>::size_type i = 1; i < m_tof.size(); ++i) {
lb[4*i] = - 2 * boost::math::constants::pi<double>(); ub[4*i] = 2 * boost::math::constants::pi<double>();
lb[4*i+1] = 1.1; ub[4*i+1] = 30;
lb[4*i+2] = 1e-5; ub[4*i+2] = 1-1e-5;
lb[4*i+3] = m_tof[i][0]; ub[4*i+3] = m_tof[i][1];
}
// Adjusting the minimum and maximum allowed fly-by rp to the one defined in the kep_toolbox::planet class
for (std::vector<kep_toolbox::planets::planet_ptr>::size_type i = 0; i < m_tof.size()-1; ++i) {
lb[4*i+5] = m_seq[i]->get_safe_radius() / m_seq[i]->get_radius();
ub[4*i+5] = (m_seq[i]->get_radius() + 2000000) / m_seq[i]->get_radius(); //from gtoc6 problem description
}
set_bounds(lb,ub);
}
void printValues() {
cout << "Start epoch: " << start.mjd2000() << " (" << start << ")" <<endl;
cout << "Duration: " << duration << endl;
cout << "Asteroid density: " << asteroidsDensity << endl;
cout << "BEE delta v limit: " << maxDeltaV << endl;
cout << "Filter delta v limit: " << maxDatabaseDeltaV << endl;
cout << "Nelder Mead delta v limit (max transfer cost) : " << nelderMeadDeltaV << endl;
cout << "Nelder Mead resolution: " << nelderMeadGridResolution << endl;
cout << "Nelder Mead epsilon: " << epsilon << endl;
cout << "Porkchop resolution: " << porkchopResolution << endl;
cout << endl;
}
int main(int argc, char** argv) {
double before, after;
auto vm = parseCommandLine(argc, argv);
if (vm.count("help")) {
return 1;
}
printValues();
if (print) {
return 0;
}
model::NelderMead::setEpsilon(epsilon);
model::NelderMead::setMaxIterations(100);
model::NelderMead::setMissionDuration(duration);
model::NelderMead::setMaximumTof(maxTof);
model::NelderMead::setMissionStart(start);
model::NelderMead::setResolution(nelderMeadGridResolution);
model::NelderMead::setMaximumDeltaV(nelderMeadDeltaV);
// generate filtered database
if (filterAsteroids) {
model::NelderMead::setMaximumDeltaV(maxDatabaseDeltaV);
model::FilterAsteroids().run(&hive, sourceDatabase, filteredDatabase, true);
model::NelderMead::setMaximumDeltaV(nelderMeadDeltaV);
}
// perform search
if (search) {
// load filtered database
std::vector<model::Asteroid*> asteroids;
before = model::getMillis();
asteroids = model::AstorbReader(filteredDatabase).readAsteroids(asteroidsDensity);
asteroids.push_back(&hive);
after = model::getMillis();
cout << "Database contains " << asteroids.size() << " asteroids, loaded in " << after - before << " ms." << endl;
cout << endl;
model::Transferbase transferbase(progressFile, asteroids, start.mjd2000(), duration, nelderMeadDeltaV, nelderMeadGridResolution, epsilon, static_cast<int>(asteroids.size()), asteroidsDensity);
if (transferbase.fileExists() and not noResume) {
// resume previous progress
before = model::getMillis();
transferbase.load(true);
after = model::getMillis();
if (not noResume) {
cout << "Resumed from previous progress in " << after - before << " ms." << endl << endl;
}
} else {
// create new database
transferbase.create();
}
before = model::getMillis();
hive.calculateTransfers(asteroids, &transferbase, maxDeltaV, static_cast<int>(start.mjd2000()));
after = model::getMillis();
cout << "Performed search in " << (after - before) / 1000.0 << " s." << endl << endl;
}
if (finalize.length() > 0) {
// split filenames
size_t commaIndex = finalize.find(',');
if (commaIndex == std::string::npos) {
cout << "Could not parse the filenames" << endl;
return 1;
}
std::string inputFile = finalize.substr(0,commaIndex), outputFile = finalize.substr(commaIndex+1, finalize.length() - commaIndex - 1);
// load unfiltered database
std::vector<model::Asteroid*> asteroids;
before = model::getMillis();
asteroids = model::AstorbReader(filteredDatabase).readAsteroids(1);
asteroids.push_back(&hive);
after = model::getMillis();
before = model::getMillis();
model::Transferbase::finalizeTransferbase(&hive, asteroids, maxDeltaV, inputFile, outputFile);
after = model::getMillis();
cout << "Finalized transfer database in " << after - before << "ms." << endl;
}
if (porkchop.length() > 0) {
// load unfiltered database
std::vector<model::Asteroid*> asteroids;
before = model::getMillis();
asteroids = model::AstorbReader(sourceDatabase).readAsteroids(1);
asteroids.push_back(&hive);
after = model::getMillis();
cout << "Database contains " << asteroids.size() << " asteroids, loaded in " << after - before << " ms." << endl;
cout << endl;
asteroids.push_back(&hive);
// find asteroid names
size_t commaIndex = porkchop.find(',');
if (commaIndex == std::string::npos) {
cout << "Could not parse the asteroid names" << endl;
return 1;
}
std::string fromString = porkchop.substr(0,commaIndex), toString = porkchop.substr(commaIndex+1, porkchop.length() - commaIndex - 1);
cout << "Generating porkchop from " << fromString << " to " << toString << endl;
// find asteroids
model::Asteroid *from=nullptr, *to=nullptr;
for (model::Asteroid* asteroid : asteroids) {
if (asteroid->getName().find(fromString) != std::string::npos) {
from = asteroid;
}
if (asteroid->getName().find(toString) != std::string::npos) {
to = asteroid;
}
}
if (from == nullptr) {
cout << "could not find an asteroid in database named " << fromString << endl;
return 1;
} else {
cout << "Found from asteroid:\t" << from->getName() << " " << from->getPlanet().get_elements() << endl;
}
if (to == nullptr) {
cout << "could not find an asteroid in database named " << toString << endl;
return 1;
} else {
cout << "Found to asteroid:\t" << to->getName()<< " " << to->getPlanet().get_elements() << endl;
}
bool porkchopTof = true;
cout << "Generating pork-chop plot" << endl;
model::PorkChop porkchop(from->getPlanet(), to->getPlanet(), porkchopResolution, porkchopResolution, start, kep_toolbox::epoch(start.mjd2000() + duration), -1, maxDeltaV);
// model::PorkChop porkchop(kep_toolbox::planet_ss("Earth"), kep_toolbox::planet_ss("Mars"), porkchopResolution, porkchopResolution, start, kep_toolbox::epoch(start.mjd2000() + duration), -1, maxDeltaV);
if (porkchopTof) {
porkchop.generateTof("porkchop");
} else {
porkchop.generateArrival("porkchop", kep_toolbox::epoch(2137), kep_toolbox::epoch(2161));
}
}
if (printBranching.length() > 0) {
cout << "Printing branching for file \"" << printBranching << "\"" << endl;
// load filtered database
std::vector<model::Asteroid*> asteroids;
before = model::getMillis();
asteroids = model::AstorbReader(filteredDatabase).readAsteroids(asteroidsDensity);
asteroids.push_back(&hive);
after = model::getMillis();
model::Transferbase transferbase(printBranching, asteroids);
transferbase.load(false);
transferbase.printTransferbase(&hive, maxDeltaV);
}
#if NELDER_MEAD_DEBUG
model::NelderMead::printDebug();
#endif
cout << "finished" << endl;
}
/// Sets the reference epoch
void keplerian::set_ref_epoch(const kep_toolbox::epoch& when) {
m_ref_mjd2000 = when.mjd2000();
}
// Wrappers for the ephemerides computations
static inline tuple eph_wrapper1(const kep_toolbox::planet::base &p, const kep_toolbox::epoch &when)
{
kep_toolbox::array3D r, v;
p.eph(when.mjd2000(),r,v);
return boost::python::make_tuple(r,v);
}
