Copenhagen suborbitals....

Apolloman a écrit:Quelqu'un a des infos sur son système atténuateur (qui sert lors de l'atterrissage... ATTENTION je ne parle pas des parachutes)
Je n'ai rien lu sur le sujet nulle part (ou je l'ai louper)

1. Context or base:

Something is holding on to the seat. In this case it is our
spacecraft. The shape of the interior construction and distribution of
subsystem has a major impact on how and where a seat can be placed. The
final position and orientation must satisfy functions like window
outlook, easy ingress/egress, control panel operation, natural or
induced acceleration, etc.

2. Acceleration/impact:

The connection between the seat and the spacecraft may require
control of natural or induced accelerations and vibrations in vectors
related to the mission scenario. There are numerous systems that can
handle this. And example could be struts, wire rope insulators, elastic
bands, foam and water.

3. Seat main frame:


Something has to hold the seat together. It could be a basic iron or aluminum frame holding on to the struts or directly to the spacecraft. I like plain carbon steel … for now. This basic frame only needs to have a low detailed ergonomic shape for the human body.

4. Human ergonomics, seat/human:


I recommend having something between the astronaut and the basic seat frame. Adding this layer gives you less requirements of the basic seat frame detailing and a way to create your final ergonomic fit for the astronaut. This layer could be a detailed shaped carbon fiber sheet or a foam coating. I like working with memory-shape foam which is easy to shape, add and provides me with a great ergonomic comfort. It really doesn’t matter if you where nervous before a flight and ate too many burgers. Your recently appeared love handles will be well met by the memory shape foam.


...

I have been around several ideas of acceleration control ranging from long dampening struts, air-cylinders, elastic bands, foam and more. A few months back I snuck onboard a Royal Danish battleship and found a possible solution: wire rope insulations. They are used to hold delicate equipment preventing acceleration and vibration. Such a system is able to deal with specifically known impacts in all directions and could be the connection point between the spacecraft and seat main frame while handling acceleration during launch and splashdown. So, for now I hope it can be a solution to this issue.

Kristian von Bengtson a écrit:To answer your questions:

You have made some comparisons to the Apollo system. I have used the very same drawings at first when I was thinking about how to do this.

Apollo had the long struts which give you some arm-length for de-acceleration and the aluminum ring which is broken during water impact to take some energy. They also control the angle of the splash down impact.

This is all done wisely to meet the 30-40 G impact!! which Apollo landed with on water. The angle in which the capsule cut into water was estimated to remove some 80% of the g´s leaving the rest to struts.

We have simplified the system because we do not have the same entry speed because we do not fall from the moon (app 40.000 km/h) but only go on a suborbital ride. Helped along by parachutes we have a final speed of 10 m/s during splash down and with estimated water impact we believe we get about 10 G on the person.

If you look into the MSIS NASA manual (google) 10 G is alone not a problem for a person lying on his back. You could go without anything. But we wanna make it somewhat comfortable ride so I will add 2 wire rope insulators which take vibration and maximum compression (in 3-axis) at 1 tonnes. It only provides about 100 mm of compression but it will make the ride very much more comfortable.

waddlelou a écrit:Bon ça y est j'ai la réponse pour Apolloman car mon commentaire s'est perdu apparemment sur Wired..
KVB m'a répondu directement, je vous faire lire :



Il y aura 2 amortisseurs à câble métallique, du genre :

http://img.directindustry.com/images_di/photo-m2/anti-vibration-mounts-wire-rope-isolators-497999.jp

Donc rien au niveau de la capsule vu qu'elle chutera lentement, 10 m/s avec une pression de 10 G pour l’astronaute.

waddlelou a écrit:J'ai trouvé aussi la même info que toi pour la vitesse de chute du CM lors de l'amerrissage.
Je sais pas pourquoi il pense que Tycho DS ira moins vite que le CM Apollo.
Si t'as une explication...

waddlelou a écrit:Info sur la fabrication des ballons de redressements de la capsule situés à son sommet :

http://www.wired.com/wiredscience/2012/01/diy-space-capsule-uprighting-bags-emerging/

lionel a écrit:mais sympa la question :|