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Slika:Bi-elliptic transfer.svg

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Povzetek

Opis A bi-elliptic transfer from a low circular starting orbit (dark blue), to a higher circular orbit (red). The spaceship is traveling in a counterclockwise direction during all segments of the orbital transfer as is indicated by the large blue and red arrows. When the spacecraft arrives at point 1 it performs a prograde burn to enter the first portion of the transfer orbit (blue-green segment). It then coasts until apoapsis of this transfer orbit located at point 2 where another prograde burn is performed to raise the point of periapsis until it coincides with the orbital radius of the desired orbit. The spacecraft then turns off its engine again and coasts along the yellow segment until it arrives at point 3. The maneuver is completed by performing a retrograde burn at point 3 to slow the spacecraft down and lower apoapsis until the orbit is circular again.
Datum
Vir lastno delo
Avtor AndrewBuck
Druge različice bi-elliptic_transfer_r-ratio14.svg
SVG razvoj
InfoField
 
Izvorna koda te SVG-datoteke je veljavna.
 
Ta vektorska slika je bila ustvarjena z Python.
Izvorna koda
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Python code

Python svgwrite code 
#!/usr/bin/python3
# -*- coding: utf8 -*-

try:
    import svgwrite
except ImportError:
    print('requires svgwrite library: https://pypi.org/project/svgwrite/')
    # documentation at https://svgwrite.readthedocs.io/
    exit(1)

from math import *

# document
size = 768, 580
name = 'bi-elliptic_transfer'
doc = svgwrite.Drawing(name + '.svg', profile='full', size=size)
doc.set_desc(name, name + '''.svg
https://commons.wikimedia.org/wiki/File:''' + name + '.svg')

# background
doc.add(doc.rect(id='background', insert=(0, 0), size=size, fill='white', stroke='none'))

r1 = 109.6
r2 = 146.4
rb = 537.3

g = doc.add(doc.g(transform='translate(559.22, 290)', fill='none'))

sun = g.add(doc.g(id='sun'))
nbeam = 12
rsun, rsun2 = 8.2, 7.2
rbeam = 13.8
p = []
for i in range(nbeam):
    phi0, phi1 = 2*pi*i/nbeam, 2*pi*(i+0.5)/nbeam
    p += [[rbeam*cos(phi0), rbeam*sin(phi0)], [rsun2*cos(phi1), rsun2*sin(phi1)]]
sun.add(doc.polygon(points=p, stroke='#f89c16', stroke_width=1, fill='#dbf816'))
grad = doc.defs.add(doc.radialGradient(id='grad', center=(0.5, 0.5), r=0.5,
                                       gradientUnits="objectBoundingBox"))
grad.add_stop_color(offset=0, color='#dbf816')
grad.add_stop_color(offset=1, color='#f89c16')
sun.add(doc.circle(center=(0, 0), r=rsun, stroke='#f89c16', stroke_width=1,
    fill='url(#grad)'))

arrow_d = 'M 0.3,0 L -0.8,0.5 Q -0.5,0 -0.8,-0.5 Z'
doc.defs.add(doc.marker(id='arrow1', refX=0, refY=0, viewBox='-1 -1 2 2',
    orient='auto', markerWidth=18, markerHeight=18)).add(doc.path(
        d=arrow_d, stroke='none', fill='#0000c4'))
doc.defs.add(doc.marker(id='arrow2', refX=0, refY=0, viewBox='-1 -1 2 2',
    orient='auto', markerWidth=18, markerHeight=18)).add(doc.path(
        d=arrow_d, stroke='none', fill='#bc0d0d'))
doc.defs.add(doc.marker(id='arrow3', refX=0, refY=0, viewBox='-1 -1 2 2',
    orient='auto', markerWidth=8, markerHeight=8)).add(doc.path(
        d=arrow_d, stroke='none', fill='#197810'))
doc.defs.add(doc.marker(id='arrow4', refX=0, refY=0, viewBox='-1 -1 2 2',
    orient='auto', markerWidth=8, markerHeight=8)).add(doc.path(
        d=arrow_d, stroke='none', fill='#a42d0c'))

g.add(doc.path(d='M {0},0 A {1},{1} 0 0 0 {1},0 A {1},{1} 0 0 0 {0},0'.format(-r1, r1),
      stroke='#0000c4', stroke_width=2.5, marker_end='url(#arrow1)'))
g.add(doc.path(d='M {0},0 A {1},{1} 0 0 0 {1},0 A {1},{1} 0 0 0 {0},0'.format(-r2, r2),
      stroke='#bc0d0d', stroke_width=2.5, marker_end='url(#arrow2)'))

a1 = (r1 + rb) / 2
b1 = sqrt(a1**2 - (a1 - r1)**2)
a2 = (r2 + rb) / 2
b2 = sqrt(a2**2 - (a2 - r2)**2)

g.add(doc.path(d='M {},0 A {},{} 0 0 0 {},0'.format(-rb, a1, b1, r1),
      stroke='#00b996', stroke_width=2, stroke_dasharray='2,4'))
g.add(doc.path(d='M {},0 A {},{} 0 0 0 {},0'.format(r2, a2, b2, -rb),
      stroke='#ff991b', stroke_width=2, stroke_dasharray='2,4'))
g.add(doc.path(d='M {},0 A {},{} 0 0 0 {},0'.format(r1, a1, b1, -rb),
      stroke='#00b996', stroke_width=5))
g.add(doc.path(d='M {},0 A {},{} 0 0 0 {},0'.format(-rb, a2, b2, r2),
      stroke='#ff991b', stroke_width=5))

dv1 = sqrt(2/r1 - 1/a1) - sqrt(1/r1)
dv2 = sqrt(2/rb - 1/a2) - sqrt(2/rb - 1/a1)
dv3 = sqrt(2/r2 - 1/a2) - sqrt(1/r2)
l1 = 160

g.add(doc.line(start=(r1, 0), end=(r1, -l1),
      stroke='#197810', stroke_width=3, marker_end='url(#arrow3)'))
g.add(doc.line(start=(-rb, 0), end=(-rb, l1*dv2/dv1),
      stroke='#197810', stroke_width=3, marker_end='url(#arrow3)'))
g.add(doc.line(start=(r2, 0), end=(r2, l1*dv3/dv1),
      stroke='#a42d0c', stroke_width=3, marker_end='url(#arrow4)'))

# text
g.add(doc.text('1', font_size='48px', stroke='none', fill='black',
      text_anchor='middle', transform='translate(84, 18)',
      font_family='Bitstream Vera Sans'))
g.add(doc.text('2', font_size='48px', stroke='none', fill='black',
      text_anchor='middle', transform='translate(-508, 18)',
      font_family='Bitstream Vera Sans'))
g.add(doc.text('3', font_size='48px', stroke='none', fill='black',
      text_anchor='middle', transform='translate(181, 18)',
      font_family='Bitstream Vera Sans'))

doc.save(pretty=True)

Licenca

Jaz, imetnik avtorskih pravic na tem delu, ga s tem objavljam pod naslednjimi licencami:
GNU head Ta dokument je dovoljeno kopirati, razširjati in/ali spreminjati pod pogoji Licence GNU za prosto dokumentacijo, različica 1.2 ali katera koli poznejša, ki jo je objavila ustanova Free Software Foundation; brez nespremenljivih delov ter brez besedil na sprednji ali zadnji platnici. Kopija licence je vključena v razdelek Licenca GNU za prosto dokumentacijo.
w:sl:Creative Commons
priznanje avtorstva deljenje pod enakimi pogoji
This file is licensed under the Creative Commons Attribution-Share Alike Attribution-Share Alike 4.0 International, 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
Dovoljeno vam je:
  • deljenje – reproducirati, distribuirati in javno priobčevati delo
  • predelava – predelati delo
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Napisi

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Predmeti, prikazani v tej datoteki

motiv

nastanek

2. april 2008

tip MIME

image/svg+xml

kontrolna vsota

72dce82939298aef41f506b8252b348e65c89d82

način določitve: SHA-1 angleščina

višina

580 piksel

širina

768 piksel

Zgodovina datoteke

Kliknite datum in čas za ogled datoteke, ki je bila takrat naložena.

Datum in časSličicaVelikostUporabnikKomentar
trenutno17:46, 29. maj 2020Sličica za različico z datumom 17:46, 29. maj 2020768 × 580 (4 KB)Geek3computed the actual aspect ratios of the ellipses and delta-v.
18:32, 7. april 2008Sličica za različico z datumom 18:32, 7. april 2008768 × 472 (21 KB)AndrewBuckA bi-elliptic transfer from a low circular starting orbit (dark blue), to a higher circular orbit (red). The green arrows indicate forward directed thrust (prograde) and the red arrow indicates reverse directed thrust (retrograde).
08:13, 3. april 2008Sličica za različico z datumom 08:13, 3. april 2008768 × 472 (13 KB)AndrewBuck{{Information |Description=A bi-elliptic transfer from a low circular starting orbit (dark blue), to a higher circular orbit (red). |Source=self-made |Date=2008-04-02 |Author= AndrewBuck |Permission= |other_versions= }}

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Pridobljeno iz »https://sl.wikipedia.org/wiki/Slika:Bi-elliptic_transfer.svg«