Finished writing the leap frog system for calculating orbits

v1
Christiaan Goossens 8 years ago
parent 0428c6c7a8
commit 8cad200525

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@ -742,7 +728,9 @@
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="0">
<caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
<folding />
<folding>
<element signature="imports" expanded="true" />
</folding>
</state>
</provider>
</entry>
@ -776,7 +764,7 @@
<state relative-caret-position="88">
<caret line="5" column="45" selection-start-line="5" selection-start-column="45" selection-end-line="5" selection-end-column="45" />
<folding>
<element signature="imports" expanded="true" />
<element signature="imports" expanded="false" />
</folding>
</state>
</provider>
@ -785,7 +773,9 @@
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="0">
<caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
<folding />
<folding>
<element signature="imports" expanded="true" />
</folding>
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</provider>
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@ -819,7 +809,7 @@
<state relative-caret-position="88">
<caret line="5" column="45" selection-start-line="5" selection-start-column="45" selection-end-line="5" selection-end-column="45" />
<folding>
<element signature="imports" expanded="true" />
<element signature="imports" expanded="false" />
</folding>
</state>
</provider>
@ -828,7 +818,9 @@
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="323">
<caret line="19" column="0" selection-start-line="19" selection-start-column="0" selection-end-line="19" selection-end-column="0" />
<folding />
<folding>
<element signature="imports" expanded="true" />
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</provider>
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@ -862,7 +854,7 @@
<state relative-caret-position="1173">
<caret line="74" column="46" selection-start-line="74" selection-start-column="46" selection-end-line="74" selection-end-column="46" />
<folding>
<element signature="imports" expanded="true" />
<element signature="imports" expanded="false" />
</folding>
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@ -871,7 +863,9 @@
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="204">
<caret line="12" column="33" selection-start-line="12" selection-start-column="33" selection-end-line="12" selection-end-column="33" />
<folding />
<folding>
<element signature="imports" expanded="true" />
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</provider>
</entry>
@ -895,7 +889,9 @@
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="0">
<caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
<folding />
<folding>
<element signature="imports" expanded="true" />
</folding>
</state>
</provider>
</entry>
@ -915,43 +911,88 @@
</provider>
</entry>
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/nBable.java" />
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/mathUtils/Vector3dMatrix.java">
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/nBabel.java">
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<caret line="116" column="5" selection-start-line="116" selection-start-column="5" selection-end-line="116" selection-end-column="5" />
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<entry file="jar://C:/Program Files/Java/jdk1.8.0_91/src.zip!/java/lang/Object.java">
<provider selected="true" editor-type-id="text-editor">
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<caret line="234" column="18" selection-start-line="234" selection-start-column="18" selection-end-line="234" selection-end-column="18" />
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<element signature="e#10065#10066#0" expanded="false" />
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<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/nBabel.java">
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/Test.java">
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<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/mathUtils/Vector3dMatrix.java">
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<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/mathUtils/AU.java">
<provider selected="true" editor-type-id="text-editor">
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<caret line="21" column="26" selection-start-line="21" selection-start-column="26" selection-end-line="21" selection-end-column="26" />
<folding />
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<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/SimulatorConfig.java">
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="68">
<caret line="4" column="33" selection-start-line="4" selection-start-column="33" selection-end-line="4" selection-end-column="33" />
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<caret line="6" column="0" selection-start-line="6" selection-start-column="0" selection-end-line="6" selection-end-column="0" />
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<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/Main.java">
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="578">
<caret line="34" column="11" selection-start-line="34" selection-start-column="11" selection-end-line="34" selection-end-column="11" />
<folding />
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<folding>
<element signature="imports" expanded="true" />
</folding>
</state>
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</entry>
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/dataWriter/DataWriter.java">
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="612">
<caret line="36" column="73" selection-start-line="36" selection-start-column="73" selection-end-line="36" selection-end-column="73" />
<folding>
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</entry>
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/Object.java">
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="2822">
<caret line="192" column="41" selection-start-line="192" selection-start-column="41" selection-end-line="192" selection-end-column="41" />
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<folding>
<element signature="imports" expanded="true" />
<element signature="method#getSpeed#0;class#Object#0" expanded="false" />
@ -965,14 +1006,22 @@
</entry>
<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/Simulator.java">
<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="578">
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<entry file="file://$PROJECT_DIR$/src/com/verictas/pos/simulator/dataWriter/WritingException.java">
<provider selected="true" editor-type-id="text-editor">
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<caret line="6" column="62" selection-start-line="6" selection-start-column="62" selection-end-line="6" selection-end-column="62" />
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<component name="masterDetails">
<states>

@ -1,5 +1,7 @@
package com.verictas.pos.simulator;
import com.verictas.pos.simulator.mathUtils.AU;
import javax.vecmath.*;
public class Main {
@ -19,16 +21,19 @@ public class Main {
public static void main(String[] args) {
/**
* Object definitions
* Object definitions (in 1990)
*/
Object object1 = new Object(1/6.67384E-11, new Vector3d(1,0,0), new Vector3d(0,0,0));
Object object2 = new Object(1, new Vector3d(0,0,0), new Vector3d(0,0,0));
Object sun = new Object("Sun", 1.988544E30, AU.convertToMeter(new Vector3d(3.621484938699030E-03,3.203347049968909E-03,-1.609087138389905E-04)), AU.convertToMetersPerSecond(new Vector3d(-1.730306264794065E-06,6.909301960615850E-06,3.332250766613383E-08)));
Object venus = new Object("Venus", 48.685E23, AU.convertToMeter(new Vector3d(-3.786926829662159E-01,-6.122709221027441E-01,1.346180701578967E-02)), AU.convertToMetersPerSecond(new Vector3d(1.703979708314098E-02,-1.075790617185284E-02,-1.130972411646143E-03)));
Object earth = new Object("Earth", 5.97219E24, AU.convertToMeter(new Vector3d(1.000272608326749E+00,-1.305632418724720E-01,-1.614384880329670E-04)), AU.convertToMetersPerSecond(new Vector3d(2.003180730888720E-03,1.698793770993201E-02,5.869001824818362E-08)));
Object mars = new Object("Mars", 6.4185E23, AU.convertToMeter(new Vector3d(8.638055532014732E-01,-1.094520306989018E+00,-4.427515002554464E-02)), AU.convertToMetersPerSecond(new Vector3d(1.154235320339802E-02,9.839355267552327E-03,-7.723750026136471E-05)));
Object jupiter = new Object("Jupiter", 1898.13E24, AU.convertToMeter(new Vector3d(-5.440309619306835E+00,-2.383659935837559E-01,1.226571001615609E-01)), AU.convertToMetersPerSecond(new Vector3d(2.422143907277735E-04,-7.182284468246539E-03,2.440789748210396E-05)));
/**
* Object listing
*/
Object[] objects = {object1, object2};
Object[] objects = {sun, venus, earth, mars, jupiter};
/**
* Run the simulator for the specified objects

@ -10,6 +10,8 @@ public class Object {
public Vector3d acceleration;
public Vector3d oldAcceleration;
public String name;
private double gravitationalConstant = 6.67384E-11;
/**
@ -18,10 +20,16 @@ public class Object {
* @param position The position vector of the object
* @param speed The speed vector of the object
*/
public Object(double mass, Vector3d position, Vector3d speed) {
public Object(String name, double mass, Vector3d position, Vector3d speed) {
this.name = name;
this.mass = mass;
this.position = position;
this.speed = speed;
System.out.println(speed);
this.oldAcceleration = new Vector3d(0,0,0);
this.acceleration = new Vector3d(0,0,0);
}
/**

@ -1,5 +1,9 @@
package com.verictas.pos.simulator;
import javax.vecmath.*;
import com.verictas.pos.simulator.dataWriter.DataWriter;
import com.verictas.pos.simulator.dataWriter.WritingException;
import com.verictas.pos.simulator.mathUtils.AU;
import com.verictas.pos.simulator.mathUtils.Vector3dMatrix;
public class Simulator {
@ -16,49 +20,73 @@ public class Simulator {
*/
System.out.println("========== Simulation Started ==========\n");
// Create a timer
long startTime = System.currentTimeMillis();
/**
* Define the forces matrix for this round
* Define the forces matrix and the DataWriter
*/
Vector3dMatrix matrix = new Vector3dMatrix(objects.length,objects.length);
accelerate(objects, matrix);
try {
DataWriter writer = new DataWriter();
/**
* Start the rounds loop
*/
for(int t = 0; t != rounds; t++) {
/**
* The round has started
* Write begin values
*/
System.out.println("\nRound " + (t + 1) + " started!");
/**
* Define the initial values
*/
double time = SimulatorConfig.time;
for(int i = 0; i < objects.length; i++) {
System.out.println("Object " + (i+1) + " was at " + objects[i].position);
objects[i].updatePosition(time);
objects[i].updateAcceleration();
System.out.println("Object " + (i+1) + " is at " + objects[i].position);
writer.write(objects[i].name, objects[i].position, objects[i].speed, objects[i].oldAcceleration, objects[i].acceleration, objects[i].mass);
}
/**
* Start the leap frog integration!
*/
accelerate(objects, matrix);
/**
* Print the matrix for this round
* Start the rounds loop
*/
for(int t = 0; t != rounds; t++) {
/**
* The round has started
*/
System.out.println("\nRound " + (t + 1) + " started!");
/**
* Define the initial values
*/
double time = SimulatorConfig.time;
for(int i = 0; i < objects.length; i++) {
objects[i].updatePosition(time);
objects[i].updateAcceleration();
}
accelerate(objects, matrix);
/**
* Print the matrix for this round
*/
for(int i = 0; i < objects.length; i++) {
writer.write(objects[i].name, objects[i].position, objects[i].speed, objects[i].oldAcceleration, objects[i].acceleration, objects[i].mass);
}
for(int i = 0; i < objects.length; i++) {
objects[i].updateSpeed(time);
}
/**
* Log that the simulation has finished and save info to file
*/
writer.save();
System.out.println("========== Simulation Finished ==========");
// Display time info
long stopTime = System.currentTimeMillis();
System.out.println("Simulation took: " + (stopTime - startTime) + "ms");
} catch(WritingException e) {
e.printStackTrace();
}
/**
* Log that the simulation has finished
*/
System.out.println("========== Simulation Finished ==========");
}
public static void accelerate(Object[] objects, Vector3dMatrix matrix) {

@ -1,6 +1,6 @@
package com.verictas.pos.simulator;
public class SimulatorConfig {
public static int rounds = 2;
public static double time = 1;
public static int rounds = 60 * 60 * 24 * 10;
public static double time = 0.1; // in seconds
}

@ -0,0 +1,82 @@
package com.verictas.pos.simulator.dataWriter;
import com.verictas.pos.simulator.mathUtils.AU;
import javax.vecmath.Vector3d;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DataWriter {
private FileWriter writer = null;
// Delimiter used in text file (for import in Excel)
private static final String DELIMITER = "\t";
private static final String NEW_LINE = "\n";
public DataWriter() throws WritingException {
try {
// Define the save path
String directory = System.getProperty("user.home") + File.separator + "simulatorExports";
File directoryPath = new File(directory);
String path = directory + File.separator + getCurrentTimeStamp() + ".txt";
System.out.println("WRITING DATA TO: " + path);
if (!directoryPath.exists()) {
directoryPath.mkdirs();
}
this.writer = new FileWriter(path);
this.writer.write("Object" + DELIMITER + "Position (m)" + DELIMITER + "Position (AU)" + DELIMITER + "Speed (m)" + DELIMITER + "Speed (AU)" + DELIMITER + "Old Acceleration" + DELIMITER + "Acceleration" + DELIMITER + "Mass" + NEW_LINE);
} catch(IOException e) {
throw new WritingException("Whoop! Creation error!");
} catch(Exception e) {
throw new WritingException("Whoop! Unknown creation error!");
}
}
public void write(String string) throws WritingException {
if (this.writer == null) {
throw new WritingException("The writer isn't defined yet");
} else {
try {
this.writer.append(string);
} catch (Exception e) {
throw new WritingException("Whoop! Write error!");
}
}
}
public void write(String id, Vector3d position, Vector3d speed, Vector3d oldAcceleration, Vector3d acceleration, double mass) throws WritingException {
if (this.writer == null) {
throw new WritingException("The writer isn't defined yet");
} else {
try {
this.writer.append(id + DELIMITER + position.toString() + DELIMITER + AU.convertFromMeter(position).toString() + DELIMITER + speed.toString() + DELIMITER + AU.convertFromMetersPerSecond(speed).toString() + DELIMITER + oldAcceleration.toString() + DELIMITER + acceleration.toString() + DELIMITER + String.valueOf(mass) + NEW_LINE);
} catch (Exception e) {
e.printStackTrace();
throw new WritingException("Whoop! Write error!");
}
}
}
public void save() throws WritingException {
if (this.writer == null) {
throw new WritingException("The writer isn't defined yet");
} else {
try {
this.writer.flush();
this.writer.close();
} catch (IOException e) {
throw new WritingException("Whoop! Save error!");
}
}
}
public String getCurrentTimeStamp() {
return new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(new Date());
}
}

@ -0,0 +1,8 @@
package com.verictas.pos.simulator.dataWriter;
public class WritingException extends Exception {
public WritingException() { super(); }
public WritingException(String message) { super(message); }
public WritingException(String message, Throwable cause) { super(message, cause); }
public WritingException(Throwable cause) { super(cause); }
}

@ -0,0 +1,45 @@
package com.verictas.pos.simulator.mathUtils;
import javax.vecmath.Vector3d;
public class AU {
/**
* Helper class for working with astronomical units
*/
public static Vector3d convertToMeter(Vector3d input) {
Vector3d output = new Vector3d(input);
// Convert AU to m by NASA
output.scale(149597870.700); // Number to large when multiplied with 1000
output.scale(1000);
return output;
}
public static Vector3d convertToMetersPerSecond(Vector3d input) {
Vector3d output = new Vector3d(input);
// 1 AU/day to M/s
output.scale(1731456.84);
return output;
}
public static Vector3d convertFromMeter(Vector3d input) {
Vector3d output = new Vector3d(input);
// Convert m to AU by NASA
output.scale(6.6845871E-12);
return output;
}
public static Vector3d convertFromMetersPerSecond(Vector3d input) {
Vector3d output = new Vector3d(input);
// Convert seconds to days by NASA
output.scale(5.77548327E-7);
return output;
}
}

@ -1,4 +0,0 @@
package com.verictas.pos.simulator;
public class nBabel {
}
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