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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Has NASA ever included a ground controller or astronaut becoming insane/irrational/belligerent in a training simulation?

NASA training simulations have included a wide variety of problems thrown at the pilots and ground controllers -- not only the typical technical failures, but also some unusual outside-world stuff ...
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Optimizing Suicide Burn

For a landing via suicide burn, I have identified three phases: Starting at $t_0$, the craft approaches the ground with $v_x$ constant and $v_y$ gradually increasing (due to gravity) At $t_b$, the ...
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How can I visualize orbits given Earth-centered, inertial (ECI) coordinates?

I'm using the SGP4 algorithm which outputs Earth-centered, inertial (ECI) satellite coordinates. I found some software to visualize orbits, but they all request input as Keplerian elements. How can ...
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Rocket Engine - Actuator in Loop Simulations

For Actuator-In-Loop simulations, why are the rocket engine nozzles along with the thrust vector control assembly (including the actuators) kept inverted on a platform like in the attached image or as ...
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184 views

Atmospheric Entry Simulation: Numerical Inaccuracy

I am trying to make an atmospheric entry/aero-assist simulation. For the propagator, I have used conventional equations of motions in planet fixed reference frame: where the scalar states are- ...
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I want to simulate the antenna pointing error when tracking LEO satellites

I am trying to simulate the antenna pointing error of our antenna when tracking LEO satellites using TLE data. I am using the Skyfield library in python. First I loaded the TLE data from the Celestrak ...
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55 views

CesiumJS: Hayabusa 2 location w.r.t Earth

Given these coordinates w.r.t Sun: Hayabusa: x = 86014493 y = 112689997 z = 54295960 Earth: x = 82241037 y = 112748971 z = 48876281 How do I calculate Hayabusa coordinates w.r.t Earth center? I ...
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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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203 views

Is “Space Shuttle” written as a proper noun in the spaceflight industry?

Writing the question Was a real Space Shuttle ever used as a really big simulator? (and several others) I capitalize Space Shuttle because as far as I know, that's the actual name of NASA's spacecraft,...
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132 views

Recalculate Orbital Elements after a ΔV

I would like to write a program able to simulate a keplerian orbite given an initial position and velocity (r0, v0) and able to manage accelerations in different directions. To simulate the orbit, I ...
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58 views

How to create a new reactant Ammonium Dinitramide NH4[N(NO2)] in NASA CEA?

Ammonium Dinitramide(ADN) is a compound used as a green propellant for spacecraft propulsion applications. ADN-blends like LMP103S and FLP-106 are currently under development. However, performing a ...
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129 views

How do you simulate the effects of microgravity on plants?

My team and I are working on planting in space. What equipment/techniques are used to simulate microgravity on earth for such experiments?
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What is wrong with my orbit sim equations? How can I fix them?

Edit: Partial question: The object now moves in an ellipse like it's supposed to, but it orbits around a different point than I intend. How can I make it orbit around a particular object at a point? ...
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171 views

Cis-L2 Libration Point Halo Orbit

Queqiao became the first satellite to orbit the Cis-L2 libration point (far side of the moon). Link: https://en.wikipedia.org/wiki/Chang%27e_4 Does anyone have any insight on how to model this orbit ...
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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 ...