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.
22
questions with no upvoted or accepted answers
12
votes
0answers
212 views
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 ...
8
votes
0answers
312 views
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 ...
5
votes
0answers
96 views
Aerospike calculator software doesn't seem to altitude-compensate - am I misunderstanding aerospikes?
I'm using mvernacc's Aerospike Nozzle Design GUI, which is supposed to be able to design and predict the performance of aerospike rocket engines. The workings of the software are apparently based on ...
5
votes
0answers
435 views
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 ...
4
votes
0answers
82 views
Predictive simulation of gait on Mars?
In the Journal of Biomechanics, Volume 45, Issue 7, 30 April 2012, Pages 1293-1298, Predictive simulation of gait at low gravity reveals skipping as the preferred locomotion strategy (PDF file of an ...
4
votes
0answers
358 views
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 ...
4
votes
1answer
116 views
Space Shuttle: What are the filters in the attitude error calculation?
Here's a schematic from the space shuttle training manuals showing how the "attitude" error signal used to drive the thrust vector controllers was determined.
"Attitude" in quote ...
3
votes
0answers
85 views
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 ...
3
votes
0answers
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- ...
2
votes
0answers
52 views
Drag and lift coefficient tables/plots for Saturn V/Space Shuttle/Other
I'm looking for drag and lift coefficient data to plug into my launch simulation.
I could assume constant coefficients, but I'd like to structure my model to accept lookup tables, so I'm looking for ...
2
votes
0answers
94 views
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 ...
2
votes
0answers
58 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 ...
2
votes
0answers
50 views
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 ...
2
votes
0answers
148 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 ...
2
votes
0answers
74 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 ...
2
votes
0answers
133 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?
1
vote
0answers
44 views
Using GMAT data to determine satellite elevation angle
I am trying to simulate a communications system between a ground station in Canberra and a satellite in LEO with a $90^{\circ}$ inclination. Specifically, I am interested in the the elevation angle as ...
1
vote
0answers
51 views
Soyuz TMA Neptune IDS Button Lights Behavior On Click
I made a simple virtual Soyuz TMA Neptune IDS using simple coding (a work in process). The purpose of it is solely for the buttons location familiarization of the control panels. The buttons react on ...
1
vote
0answers
96 views
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?
...
1
vote
0answers
214 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 ...
0
votes
0answers
69 views
Space Shuttle: How were I-Load launch programs calculated?
The space shuttle launch program was based on a target attitude profile calculated for the mission and the latest winds. The attitude profile would include roll, pitch, and yaw as functions of time ...
0
votes
0answers
28 views
GMAT compilation does not generate gui
I am compiling GMAT 2020a on opensuse linux from source code downloaded from sourceforge.
I have gotten the compilation completed. Ran ok, except the /bin ...
