How do i fix the shaking problem

[onurk]

Here's the clip I got from the game. Please watch and tell me how to solve this problem

[Stone Blue]

Almost looks lie you have different reaction wheels doing adjustments on opposite axis... vOv

[DeadJohn]

Reaction wheel issues as noted above seem like a plausible explanation, plus KSP's bendy connections between parts especially docking ports. To confirm that reaction wheels are involved, turn off SAS and wait a bit to confirm that the shaking fades.

There are several ways to try lessening the problem:

• If your craft includes multiple parts with reaction wheels, try turning some off.
• Turn on "advanced tweakables" in settings then experiment with autostruts.
• Send an engineer and use "EVA Construction" mode to manually add struts.
• Try the Kerbal Joint Reinforcement Next mod.
• (If you are using the stock docking port rotation feature, that can interfere with struts and autostruts. I like the Dock Rotate mod better than stock rotation.)

 

[jimmymcgoochie]

A long, thin structure with the control point at one end will be susceptible to this kind of issue- since the control point is far from the centre of mass it’s disproportionately affected by any wobbles and will act to correct it, causing an even greater swing in the opposite direction and so on; the oscillation will get worse as long as SAS is active and trying to fix the problem that it created.

Autostruts would help by holding certain parts still relative to each other and so stiffening the structure, as would putting your control point closer to the centre of mass so it doesn’t move nearly as much if the craft starts wobbling. A quick burst of time warp will freeze the parts and stop the wobble, though this is just a temporary fix and it’ll come back if you leave SAS on.

[Snark]

22 hours ago, onurk said:

Here's the clip I got from the game. Please watch and tell me how to solve this problem

What the other folks have said, but here are some suggestions you can do in-game without having to install anything or launch a new craft or whatever:

• First, change your SAS mode to "hold orientation".
  • You've currently got it set to "hold target".  My observation has been that SAS seems to be more zealous if you tell it to hold a particular orientation (such as ) than if you tell it to just hold its current orientaiton.
  • By itself, this change may or may not be enough to fix your problem, but I suspect it will help reduce it a bit.
• Second, reduce your reaction torque.  You have a big floppy structure, and reaction wheels don't react well with something that's too floppy.
  • The previous posters have suggested ways to solve this by making the structure more rigid, which is true:  basically, "Your structure is too weak for your reaction wheels."
  • However, one very easy workaround is to approach the problem from the opposite direction, and instead think of it as "Your reaction wheels are too strong for your structure."  Instead of trying to make the structure stronger, you can make the reaction wheels weaker.
  • So, for example, just take the control-authority slider for your reaction wheels and reduce it by a lot.  There will be some threshold below which your structure stops oscillating.
  • This does have the disadvantage that your station will be much slower to turn its orientation around to the direction you want... but at least it'll stop oscillating.
• Third, make sure your control-from point is rigidly mounted to your reaction wheel.
  • This one's a bit more subtle to explain, and I don't know whether it's actually relevant to you, because from the video I can't tell where your control point is.
  • So I'll save the detailed technical explanation of "why this is" unless you're actually interested, and give you the bottom line:
  • You may have this particular problem if you've set your "control from here" point to some docking port or command pod that has a lot of bendy connections in between it and your strong reaction wheel.
  • For example, in the video, I see you've got a HECS2 probe core, which has very powerful reaction wheels on it.  Suppose you've set your "control from here" point to somewhere else on the station-- for example, some docking port, located on a component that has multiple bendy docking ports between it and the HECS2.
  • If this is part of your problem, then the way to fix this would be to, 1. set your "control from here" point to be the HECS2, and 2. disable any other reaction wheels on the station besides that HECS2.