Questions tagged [simulation]

representation of environment or process in a more accessible form using virtual or physical imitation or analogues, often for the purpose of training or testing, includes both real-world (physical) and numerical techniques.

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Getting state vectors from JPL Horizons ephemerides

I'm simulating the Sun-Earth-Moon system by numerical integration of equation of motion. I've confused a little bit in JPL Horizons ephemerides. Could anyone explain (if possible, on pictures), how ...
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Does anyone know how the Flight Club website simulates Falcon 9 launches?

Does anyone know how the Flight Club website is able to provide falcon 9 launch simulations? Given the estimated weight, fuel mass, thrust, ect, how are they able to provide a graph of how it could ...
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Does Kerbal Space Program have a software migration path to Lagrange points, halo orbits, and other 3-body goodies?

At about 05:37 in Scott Manley video Kerbal Space Program 2 - What We Know About The Sequel So I’m cautiously optimistic and I really obviously want this to be ...
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Could an aircraft ever simulate Martian gravity perpendicular to the aircraft's floor?

Suppose I designed a complex, self-contained, robotic system to harvest and convert Martian atmospheric CO2 and ground H2O into rocket fuel (CH4 + O2) and after exhaustive computational fluid dynamic (...
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1answer
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How were Apollo spacesuits cooled during simulations/rehearsals on Earth?

The answer and comments to How have space suits dissipated the heat removed from astronauts? explain that the Apollo space suits used the sublimation of ice into the vacuum of space to constantly ...
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Can planet Earthtoo put a Tooian in orbit too?

Planet Earthtoo saw that Earth could put a person in orbit, so they wanted to go to space too. The planet Earthtoo is twice the diameter of Earth, with the same internal structure - the average ...
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Game for teaching basics of orbital mechanics

I am looking for a game that would be suitable for teaching basic orbital mechanics concepts to primary school students (grades 6-8). Contrary to most of the questions here asking about spaceflight ...
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7answers
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The Martian: Does it really take a supercomputer to calculate spaceflight maneuvers?

My preemptive apologies for asking a question about a movie, and the spoilers within said question, but considering the widespread support for its scientific plausibility, I'm hoping you'll let it ...
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1answer
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How might one approach using AI (convolutional neural network) to predict collisions in orbit?

CNN's Tomorrow's Hero profile Meet Amber Yang. She's trying to prevent a space debris catastrophe describes an investigation into the use of a convolutional neural network (CNN) to predict possible ...
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3answers
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Who does these mesmerizing simulations of the phases of the Moon? And how?

It's lunar new year here and people will be lighting fire crackers and launching bottle rockets off and on until dawn, so I thought I would read up on it. EarthSky.org's Moon Phases update Your new ...
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2answers
342 views

Was a real Space Shuttle ever used as a really big simulator?

@OrganicMarble's answer to How much of the Shuttle was physically realized in the simulator? makes me wonder if Shuttle crew ever sat or stood or otherwise experienced being in an actual Space Shuttle ...
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How much of the Shuttle was physically realized in the simulator?

How much of the Shuttle physically existed in the simulator? Was it just the flight deck? Or were the mid-deck, lower equipment bay, and/or payload bay also included?
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Are Jool's moons' orbits stable?

The fictitious Kerbol system includes ...five planets: Moho, Eve, Kerbin, Duna and Jool; and two dwarf planets: Dres and Eeloo; orbit around it. Kerbol contains 99.97 % of the mass in the Kerbol ...
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1answer
177 views

What is Direct Simulation Monte Carlo and why is it a good method for simulating spacecraft drag in VLEO?

Reducing spacecraft drag in Very Low Earth Orbit through shape optimisation J. A. Walsh and L. Berthoud (2017) show simulations calculating drag coefficients for different "nose cone" shapes ...
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Can Kerbal Space Program act as a suitable simulator with the right mods?

The game is great alone, but if we install a mod called Real Solar System and another called Realism Overhaul, the force of gravity, engine power atmospheric heights and everything happens to real ...
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How can you predict an orbit, based on an initial position and an initial direction vector?

I've been developing a planetary simulator in Unity 3D (C#) and I need some help, however I feel this would be a better place for it. I'm starting my planet from a position vector. On initialisation I ...
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Software to simulate / optimize ascent trajectory

I read the previous question on this site about astrodynamics software and I have tried STK (free version) and GMAT, but I could not find software to simulate and optimize a launch trajectory. Is ...
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How does one test Ground Segment communications with, and "downlink" data from a spacecraft that's still on the ground?

NASA News item Ground Segment Testing a Success for NASA’s James Webb Space Telescope says: Testing teams have successfully completed a critical milestone focused on demonstrating that NASA’s James ...
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1answer
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What type of software is used to make radiation shielding simulations for use in Space or Mars?

Hopefully this is relevant to the board and doesn't get deleted. Quick background: In Thailand. Grad student, mechanical engineering, with very limited knowledge regarding nuclear or space radiations. ...
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1answer
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How would an n-body numerical orbit simulator use hierarchy in its Jacobian?

This question is about techniques to calculate orbits. The Github post On the dynamical stability of Principia's modified Jool system (cited in this answer) says: Principia computes the trajectory of ...
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1answer
891 views

How did Goddard's rocket reach 41 feet altitude in under 2.5 seconds?

I'm working on a simple rocket flight simulation program, and am trying to reproduce aspects of Goddard's first successful rocket flight. My sources put the empty weight at 5.75-6lbs, loaded weight 10....
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Why shouldn't we illustrate spacecraft trajectories on top of static pseudo-potential surfaces?

Three-body spacecraft orbits1 are regularly discussed here and from time to time someone will include a pseudo-potential plot from Wikipedia in their explanation. The discussion often goes south when ...
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1answer
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Books on rocket engine *dynamics*? [closed]

I'm a controls guy and I would like to "emulate" a given rocket engine's response behavior to different thrust signals inside a computer simulation. Thus I'm looking for a book that explains well the ...
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1answer
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What's the atmospheric drag coefficient of a Falcon 9 at launch (sub-sonic, large fairing)

While I said just a few hours ago that "There's almost no such thing as a dumb question! this one just might sound like one. I'm making some slides about first principles thinking applied to ...
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What's is this very CGI looking clip in this NASA video of the Alpha Magnetic Spectrometer installation?

This is the NASA video AMS Time Lapse Installation a time-lapse of the Alpha Magnetic Spectrometer (AMS) installation at the International Space Station. At about ...
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Would current computer technology have made the Moon landings any easier?

A few days ago a group of us were discussing the Moon landings (specifically the Apollo programme). Whilst this in itself was incredibly impressive we thought it was particularly impressive given the ...
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Accuracy of converting from TLE/Orbital Elements to Cartesian if used for other propagator?

Say that I wanted to propagate a real-life satellite based on an initial position in space. However, the only source of data I can get is from a tracking website like CelesTrak or Space-Track, where ...
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2answers
170 views

Modelling a circularizing burn at Apogee

I am relatively new to rocket physics and am looking into modelling burns. Is there a good place to start modelling an orbital burn? I know about the rocket equation but perhaps that is not what is ...
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1answer
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Is this C# code to obtain the coordinates of the planets correct?

This should be a comment to an 2012rcampion's answer to this question: Determining orbital position at a future point in time I'm using the linked data of that answer, under "Computing Position ...
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1answer
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The Tootronaut is ready to enter the Earthtoo atmosphere, will it be twice as hot?

In this question I posed the problem of getting an inhabitant of the planet Earthtoo into low orbit (LEtooO) using conventional rocket. Judging by the great answers there, it is - to my surprise - ...
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Why does Gravity Simulator's rendering of TESS' orbit look like a pretzel? How can I unpretzefy it?

Below is a screen shot from the amazing Gravity Simulator driven by our own @HappyKoala. If you haven't seen it recently go check it out now, then come back in 30 minutes and read the rest of my ...
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SpaceX launch simulation software?

Say you're a SpaceX launch engineer. You have a mission design meeting where you'll talk about different mission scenarios. The meeting is in a few hours. Would you run a quick simulation in KSP to ...