Recent content by Imagin_e

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    Undergrad Light reflecting through a geometry

    I am discussing physics with a friend and we need someone to confirm a thing that we're not agreeing on. We are discussing incident light that is passing through different geometries, and I want to know how the light behaves when it reflects inside a half sphere (of glass for example). Maybe...
    • Imagin_e
    • Thread
    • Geometry Light Reflection Sphere
    • Replies: 3
    • Forum: Optics
  2. I

    Instrument and springs attached to it

    Hi! I am trying to solve a textbook problem without any success. Fortunately, I found someone that solved it but there is one step that I don't get. Here is a figure showing the problem : https://ibb.co/koatCa First, we have (I get this part since I found a similar use of it in the book)...
  3. I

    How can I reduce a controller with block reduction and find a transfer function?

    Yes. Oh, okay. Did not think of that.
  4. I

    How can I reduce a controller with block reduction and find a transfer function?

    < Mentor Note -- thread moved to HH from the technical forums, so no HH Template is shown >[/color] Hi! I've been working on reducing a controller with block reduction in order to understand it and I have trouble to continue since I've stumbled across something that I haven't seen before. My...
  5. I

    PID control and block reduction

    Thanks for the help!
  6. I

    Impulse and step response related to the angular position of a spacecraft

    Thank you for explaining, now I understand. Cheers!
  7. I

    PID control and block reduction

    Okay. I followed your advice and looked it up, and then tried to draw the new diagram instead. Would you say that this one is correct now (Never mind that they have the same name, G. We can call the left blocks for K, but you're probably following)? If yes, then I know how to continue...
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    PID control and block reduction

    < Mentor Note -- thread moved to HH from the technical forums, so no HH Template is shown >[/color] Hi! I am trying to reduce a PID controller by using block reduction rules but I am having some trouble Here is the block: https://postimg.org/image/9am5n8bsp/ My attempt: 1. Multiply...
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    Impulse and step response related to the angular position of a spacecraft

    Thanks buddy!
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    Impulse and step response related to the angular position of a spacecraft

    Hi! I don't know if I'm in the right forum of this site but I'm trying anyway. I was just wondering if someone could explain how the step- and impulse response is related to an angular position (of e.g. a spacecraft )? Just a little about the theory since I am trying to actually understand...
    • Imagin_e
    • Thread
    • Angular Angular position Impulse Impulse response Position Response Spacecraft Step response
    • Replies: 6
    • Forum: Aerospace Engineering
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    What are J2 perturbations and how do they affect satellite orbits?

    Homework Statement Hi! I am trying to solve a problem where I need to calculate a satellite's orbit, but first I would like to ask for some clarifications from someone here that might know this stuff. I need to design an orbit so that no maneuvers (one part of the problem) are necessary to...
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    Orbit that does not need maneuvering

    Anyone that can help? : (
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    Orbit that does not need maneuvering

    Hi! This is a textbook problem that I need help with (I want to practice as much as I can before the exams) and I hope that there is someone who can guide me. The question is: You’re doing a first-order analysis on a new satellite in an elliptical (e = 0.2) orbit at 700 km altitude. Can you...
  14. I

    Is the Analysis of the Space Shuttle's Orbit Correct?

    Thank you for the help!
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    Is the Analysis of the Space Shuttle's Orbit Correct?

    Okay, so I did the following, I used the formulas for the perigee and apogee radius to get rp and ra. They are: rp=a(1-e) and ra=a(1+e) . I also calculated the absolute value of ro. By inserting the values in the equations above I got: rp<ro<ra , the difference is a couple of meters. This...