Jump to content

TheUntitledGoose

Members
  • Posts

    9
  • Joined

  • Last visited

Posts posted by TheUntitledGoose

  1. On 8/22/2022 at 7:04 PM, Arrowstar said:

    I assume you're talking about that video I put up a year or two ago on Vimeo.  It actually was pretty easy.  In Launch Vehicle Designer, I created a custom reference frame with the spacecraft at the center, the X axis pointing from the spacecraft to KSC, and the Y axis pointing from the spacecraft to the Sun.  I then used that reference frame to steer the vehicle, just setting the steering angles to 0 deg right ascent and 0 deg declination.

    To get that into KSP, I used the LVD function which creates a special CSV file that is read in by a kOS script that comes with KSPTOT.  That does the steering in KSP.  Let me know if you have any other questions!

    A quick question is there any guide on how mission architect works?

  2. 1 hour ago, Arrowstar said:

    In the sequential events list box, select the event whose maneuver you want to upload, then right click it and select "Upload Impulsive Delta-V Action to KSP."

    Sorry for keeping on bothering you but it still is making me fly away from Eve even after letting it sit until the 15th iteration. Now after moving the UT time forward backwards a bit it still doesn't come into Eve's SOI. I can provide screenshots if needed.

     

    Sorry I'm just really stupid.

  3. 13 minutes ago, Arrowstar said:

    Okay, after looking at your screenshots I do think we're running into the limitations of the "Zero Radius SOI" assumption.  As I said, MFMS does not model the fact that Kerbin or Eve have finite sized spheres of influence, and this can and will have a noticeable impact on the solution.  MFMS was designed for quick studies of the multi-gravity assist trade space and not for higher fidelity dynamics simulation (which you'll need LVD for, as I previously mentioned).  I think at this point you're just running into the limits of the tool.

    If you'd like, you can get a bit more fidelity by importing your MFMS sim into LVD very easily:

    1. In MFMS, click the Save Results to File for LVD button.  Select a name and location to save the file and save it.
    2. Open up Launch Vehicle Designer from the main KSPTOT GUI.
    3. In LVD, File -> New Mission Plan from MFMS Output
    4. Optimization -> Optimize Mission to get all the various bits of the trajectory to line up.

    The result from the optimization in LVD will be a continuous mission plan with higher fidelity that you can use in KSP.  You can get even more fidelity out of it if you put in your vehicle's masses, stages, tank information, engine information, etc, and then convert the impulsive delta-v to finite burns.  That's an advanced step, though, so one thing at a time.

    Let me know if you have any questions!

    Hello, I've ran the optimization for a bit, and now I don't know what do with it, I don't see any way I could import any maneuver into KSP.

  4. 14 minutes ago, Arrowstar said:

    Okay thanks.  What happens if you adjust the time of the maneuver a bit forwards or backwards?  Keep in mind that MFMS is using a zero radius SOI assumption for Kerbin, so the timing may need a bit of tuning to work in KSP's finite radius SOI simulation.

    I've played around with the UT time for a bit and now it's a bit better but still waaaaay off. Images: https://imgur.com/a/ntqny50, what it thinks will happen vs the closest what I got to that image: https://imgur.com/a/UFW4qvr

  5. 1 hour ago, Arrowstar said:

    There's a few things possibly going on.

    First, you need to make sure that your initial orbit around Kerbin is exactly what it is in KSP.  If it's any different, you won't get a good answer.

    Second, when you go to upload the maneuver, you need to make sure that your departure burn is given relative to universal time and not the periapsis time.  If it's not, that'll mess things up too.

    Can you provide provide screenshots of the MFMS window after you get a solution, the upload maneuver window with the maneuver filled in, and the KSP window where you're seeing things fly off into space (with the current time in the game shown)?  I can tell me with all that.  Thanks!

    Yes, I have the exact orbit it is in KSP in the program, yes I input the UT as it said in UT not periapsis. Here's the 2 screenshots. https://imgur.com/a/V6UQD71 and here's in game, https://imgur.com/a/92QAVYI.

    Sorry, couldn't figure out how to post images on here :(

    Edit: In the maneuver uploader I am uploading both of the maneuvers but it doesn't matter if the first one send you to the void.

×
×
  • Create New...