Questions tagged [flight-control]
Systems and software used to control a space craft in an atmosphere.
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0answers
32 views
Analyzing Amateur Rocket Stability and Range Safety
I am working with a university bunch of other university students on building a very large amateur rocket. Our objective with this rocket is just to go very high, with no significant payload or ...
2
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0answers
50 views
Among Quantitative Feedback Theory and H infinity, which one is preferred for robust control of satellites esp. small satellites? And why?
I am interested in designing a robust controller for a small satellite with antenna, sloshing propellant and flexible panels on board. I am mostly interested in achieving arcsec precision pointing ...
10
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6answers
635 views
Is it possible to navigate space travel with no computer?
From launch to land could a person travel in space with only mechanical devices like a sextant? With enough experience what would be the minimum devices needed? Which vehicle currently would be easier ...
4
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0answers
168 views
Why would someone use Modified Rodrigues Parameters over Quaternions for spacecraft attitude estimation? And vice versa?
I see quite some papers on spacecraft attitude determination and control, that rely on quaternions. While some others rely on MRPs. The advantage that I see so far is that... for quaternions, the ...
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0answers
188 views
Avionics Systems on board Falcon 9 (Reusable)
What kind of control systems are active and how do they function on board a Falcon 9 booster while it's landing ?
12
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1answer
3k views
How can a rocket go straight up after ignition? [duplicate]
We have seen during rocket launches that the rocket goes straight up after the launch clamps have disconnected.
What ensures that it doesn't tilt because of the uneven mass distribution?
How does a ...
8
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1answer
477 views
Machine Learning and Classical Navigation, Guidance and Control in Space Exploration
Due to the increasing availability of large quantities of data and computational power, machine learning (ML) is providing increasingly better results in various fields. Much research has been done on ...
4
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4answers
323 views
Using what technology one can keep a spacecraft truly non rotating
Inspired by the question I thought maybe a photon thruster can be used for precisely giving thrust to maintain spacecraft attitude. But soon I realized that for high precision attitude control, one ...
1
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1answer
108 views
An program that automatically generates a rocket guidance system?
This is for a liquid propelled rocket that launches from earth. It could also perhaps be used for orbital maneuvers and landing on the Moon (not mars or earth).
The inputs for such a program would ...
13
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4answers
2k views
How were the pilots of the space shuttle able to operate the rudder after time in space?
I've just watched this video showing three astronauts who've returned from space. At around the 5:46 mark in the video we can see astronaut Chris Hadfield being carried out of the Soyuz capsule. I've ...
7
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0answers
72 views
Implementing control system to track position and velocity references simultaneously
I've been trying to implement a PI (proportional-integral) controller to allow a launch vehicle to track 2 reference states simultaneous, namely position and velocity, so that the launch vehicle will ...
4
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2answers
284 views
SpaceX stage 1 reentry control?
In watching today's BulgariaSat-1 broadcast:
It was mentioned that the drone ship had acquired the 1st stage as it was returning. I had always been under the ...
4
votes
2answers
423 views
Does the Hubble telescope use a “simple” PID-controller for its pointing control system?
I am wondering whether the Hubble Space Telescope uses a "simple" PID controller like this:
Or is it using another type of control system that may be much more complex?
5
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1answer
252 views
Controller to reaction wheel interface
A typical controller generally gives control torques which should be applied about the axis of a satellite. How exactly is this torque applied using a reaction wheel?
For example if control torques ...
7
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4answers
2k views
Why does spinning help stabilisation?
I don't really understand why do we use spin stabilisation for rocket launches?
If I understand correctly, the idea is to make the rocket spin really fast so that any asymmetry in the thrust/...
1
vote
2answers
223 views
How much can static cling be used to move things in space? Tractor Beam
Can static cling occurs in space? Can a static charge be amplified laterally to move objects in space similar to Star Trek's tractor beam? Can a static charge could be carried by a sustained particle ...
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0answers
76 views
Linear Control Lock?
Assume a spacecraft with a less-than-perfect maneuvering thruster configuration such that in a particular attitude while attempting to dock, the thrusters will not allow translation along a particular ...
9
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3answers
2k views
Does the way this experimental kill vehicle moves and thrusts suggest it contains inertia wheels?
This comment below this answer about 'spacecraft' or at least 'craft' that can maneuver near the surface of low gravity bodies links to this video about Lockeed Martin's Multiple Kill Vehicle.
If I ...
4
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1answer
282 views
Apollo CSM thruster quad orientations vs LM
Can anyone explain to me the reasoning behind the differences in the placement and orientation of the thruster quad packages on the CSM and LM? On the CSM a quad is a + shape and are located in a ...
0
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0answers
102 views
Will there be torques on spacecraft due to interaction of magnetic torquer with the residual magnetic field of the spacecraft?
Assuming the magnetorquer and the field generating electronics are both rigidly fixed to the spacecraft cube. Reference to any supporting papers/articles would be great. Thanks.
Would the residual ...
4
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1answer
520 views
How to select/design a control algorithm for spacecraft attitude control?
Control algorithms are used on spacecraft to operate reaction wheels, RCS thrusters and other actuators. Since of the most common controllers I've come across are the PID and quaternion error command. ...
7
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0answers
484 views
How is retropropulsion by the Falcon 9 first stage being used to design retropropulsion entry on Mars?
Much has been made of how the reentry burns of Falcon 9 first stages occur at an altitude where the atmosphere is similar in density to the atmosphere of Mars, and so they demonstrate that supersonic ...
2
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2answers
446 views
Rocket drag and lift based on flight direction - in which frame of reference?
Drag is aerodynamic force component parallel to the direction of motion.
Lift is aerodynamic force component perpendicular to the direction of motion.
Direction of motion with respect to what?
1) ...
6
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3answers
1k views
Is aerodynamic lift ever useful in rocket flight?
When a rocket is traveling through an atmosphere, the component of the aerodynamic force in the direction of motion is called drag, and the component perpendicular to that is called lift. Usually a ...
