OHM Crew Dragon for Orbiter2016

[Donamy]

Perhaps a view of the docking target, like the one the soyuz uses. I have a similar view I used for the Shenzhou 9.

Also, would it be too much of a problem, to put a slight rocking motion after splashdown ?

 

[jacquesmomo]

Vraiment prodigieux !!! :tiphat: in french...

 

[BrianJ]

Vraiment prodigieux !!!

Merci, Jacques

Perhaps a view of the docking target, like the one the soyuz uses. I have a similar view I used for the Shenzhou 9.

Could you give me an idea of how the view on the Shenzou works?

I don't see targets on the ISS, but I do see two points on IDA that look like grapple targets. I could certainly make an external view point to align with one or other of them(quite close together anyway). Or is something further involved?

Also, would it be too much of a problem, to put a slight rocking motion after splashdown ?

I know francisdrake's Orion has a cool "bobbing" motion at splashdown - "rocking" is slightly different but might still work - I'll give it a try


Cheers,
BrianJ

 

[DaveS]

I don't see targets on the ISS, but I do see two points on IDA that look like grapple targets. I could certainly make an external view point to align with one or other of them(quite close together anyway). Or is something further involved?

The IDA's use the same targets as the shuttle crews did which is on the hatch of the PMA's. This graphic from the STS-129 Rendezvous checklist explains the target: https://www.dropbox.com/s/0kud4a7vwiemt1l/PMA_CL_CAM_TARGET.jpg?dl=0

Photo of the centerline camera docking target of PMA-2 can be seen in this photo: https://spaceflight.nasa.gov/gallery/images/shuttle/sts-110/hires/s110e5071.jpg

Everything you need to know about the International Docking System Standard: http://www.internationaldockingstandard.com/download/IDSS_IDD_Revision_E_TAGGED.pdf
The IDSS is what the the IDA's conform to.

 

[Donamy]

Here is a screen shot of the PVT target on the IDA. I suspect there will be a camera that will focus on it.

 

[francisdrake]

Also, would it be too much of a problem, to put a slight rocking motion after splashdown ?

The 'bobbing' of the Orion is achieved by soft touchdown points' spring stiffness, and very little damping. Also the touchdown points have slightly different z-values to induce some kind of 'chaotic' movement.

Below is my example of the Orion. The first 3 points are for the bottom, the other 3 for the top end of the capsule.

static const DWORD ntdvtx_geardown = 6;
static TOUCHDOWNVTX tdvtx_geardown[ntdvtx_geardown] = {
	{_V( 0,-3.6, -1.2), 9e4, 1e2, 3.0, 0.2},
	{_V(-3, 2, -1.1), 9e4, 1e2, 3.0, 0.2},
	{_V( 3, 2, -1.1), 9e4, 1e2, 3.0, 0.2},
	{_V( 0,-5,  3),   8e4, 1e2, 3.0},
	{_V(-5, 4,  3),   8e4, 1e2, 3.0},
	{_V( 5, 4,  3),   8e4, 1e2, 3.0}
};

 

[Jeremyxxx]

I Love the Dragon V2! I can't wait for the spacecraft's maiden flight in November!

 

[pappy2]

Here is a screen shot of the PVT target on the IDA. I suspect there will be a camera that will focus on it.

Hello friends,
do not forget the cameras that were installed during the US EVA 51







"...During the spacewalk on juin 14, ARNOLD and FEUSTEL will install a pair of high-definition media and cameras on the Harmony module that will help commercial crews align with the international docking adapter of the party. before Harmony..."

 

[BrianJ]

Thanks DaveS and Don for the info re:docking targets!

The IDA's use the same targets as the shuttle crews did which is on the hatch of the PMA's.

Which means the vessel should have the same orientation whether docking with IDA or direct to PMA?
This is not the case with the IDA add-on as it is.

Well, easy enough to make an external viewpoint that aligns with PVT target on IDA, but if IDA docking port is changed to "correct" orientation (same as PMA) then the viewpoint will not be correct. What to do? Think the simplest thing is to go with the IDA configuration as it is.

@francisdrake - thank you, thank you! I wondered how you did the bobbing thing Ingenious, I'm surprised it doesn't cause problems with "Landed" status or getting flung into space - will give it a try.

Cheers,
Brian

 

[francisdrake]

I'm surprised it doesn't cause problems with "Landed" status or getting flung into space

You are welcome! In fact, while the result is simple, it took some experimenting to get there. The soft springs deform a lot, so the touchdown points need to be a little further down than usual, to avoid 'bottoming out' or sinking below the waterline.

The oscillation frequency is a result of mass, moment of inertia, spring stiffness and damping. You may want modify (soften) the stiffness even further to get a low-frequency wobbling, as the Dragon has less mass than the Orion.

 

[pclaurent]

Absolutely great. Many thanks
Philippe

 

[barrygolden]

Don, you and Brian have hit a home run. Still trying to get more info about service module but might need to be James Bond there seems to be some close kept secrets but working on it. There is a deployable device to use the targets on the docking port is might keep that in mind during an update.

 

[Donamy]

I figured a docking camera and a light, with lazer tracking.

 

[BrianJ]

Update 180827 on OH:
Added Port/Starboard acquisition lights, Docking Spotlight, Lidar.
(Spotlight 100m range, Lidar aligns between PVT targets on IDA)

Added Drogue+Main Chutes "Safe/Armed" function (just for fun ;-)

Moved Main Chutes attach point and splashdown/chute-collapse sequence.

Unobscured "Glass Cockpit" view.

Still to do:
Windows transparent from exterior.
(I tried making holes in the mesh, but it does bad things to the normals.
Think it can be done by transparent mesh + mesh sequence adjustment.)

Suggestions welcome. Thanks to francisdrake for help with Touchdown points.

Cheers,
BrianJ

 

[fred18]

Still to do:
Windows transparent from exterior.
(I tried making holes in the mesh, but it does bad things to the normals.
Think it can be done by transparent mesh + mesh sequence adjustment.)

Suggestions welcome. Thanks to francisdrake for help with Touchdown points.

Which 3d software do you use for modelling?

 

[BrianJ]

Which 3d software do you use for modelling?

GMax.

 

[Donamy]

Update 180827 on OH:
Added Port/Starboard acquisition lights, Docking Spotlight, Lidar.
(Spotlight 100m range, Lidar aligns between PVT targets on IDA)

Added Drogue+Main Chutes "Safe/Armed" function (just for fun ;-)

Moved Main Chutes attach point and splashdown/chute-collapse sequence.

Unobscured "Glass Cockpit" view.

Still to do:
Windows transparent from exterior.
(I tried making holes in the mesh, but it does bad things to the normals.
Think it can be done by transparent mesh + mesh sequence adjustment.)

Suggestions welcome. Thanks to francisdrake for help with Touchdown points.

Cheers,
BrianJ

I can help with the windows if you need.

 

[francisdrake]

Many thanks for the update!

I tried making holes in the mesh, but it does bad things to the normals.

When making holes in the mesh in Gmax, the normals are not an issue to me. My sequence is like this:

Make piercing body. Typically I use a 2D-rectangle with rounded corners, extrude it to 2 m. No material.

Select outer vessel shell. New Object tool, compound object drop down menu. Boolean.
Pick operand B, copy. (The piercing body will be needed later again).
Select the piercing body.
Cut. Remove inside. Manually delete any vertices not in the intended section curve (often remnants of the copied piercing body).

Convert the boolean object to Editable shell!
Always convert to editable shell before doing anything to a boolean object.

Repeat for inner shell (pressurized shell).

Then select the piercing body and intersect it first with the outer shell, then with the inner shell. This is to create the 'window sill covering the hollow between inner and outer shell.

Finally intersect the piercing body with the outer shell, remove outside, to create a window pane.

To tidy up welding of some close-together vertices may be necessary.
Finally delete the piercing body.

It is a tedious process, but aside from that it usually works without side effects. Sorry for the lengthy post ...

 

[Donamy]

AC3D works basically the same way. they just use different names for the process.

 

[BrianJ]

I can help with the windows if you need.

Hi Don, if you can make window holes in the outer shell (inner shells are done) that would be great. I found that whatever I did, the external normals didn't look right (to the point of being unacceptably wonky). As I previously mentioned, I think I can make the windows work by arranging the mesh and group sequence correctly (but this impacts on animations, mesh deletions etc. so I haven't got around to it yet!). Anyway, if you have any success making window holes, drop me a line EDIT: Problem solved! See post below....


@francisdrake - Thanks for the detailed post! Yes, I use the Boolean functions for making window holes too. Works pretty well most of the time. For some reason not working for me in this instance.


Cheers,
BrianJ