"Sauvetage" du Rover Spirit sur Mars

urix a écrit:Ah oui il font carrément les simulations avec une réplique ! Je ne le savais pas.

CAN THE ROBOT ARM (IDD - Instrument Deployment Device) BE USED TO RESCUE THE ROVER BY...
PUSHING - The IDD is about 2-3 Kg and about 1m long, the rover is about 185Kg. You do the math. The wrist/turret are much much weaker - but the Elbow can manage 20 Nm force, it can handle 40 Nm static, the Shoulder's two motors about 45 Nm.
If you could brace the IDD into the ground, you could apply, say, 30 Nm at the shoulder without getting near the static limit of the elbow. You would have only about 60 N of force at the IDD attachment point though - as each part of the arm is about half a meter long. The rover, at 185kg, has a total force from gravity of about 697N. So the arm would only ever be able to take about a tenth of the weight of the rover.
PULLING - Same as above.
TIPPING - Changing the Centre of Gravity of the rover by extending the arm thereby shifting the weight on the wheels. See above. They are going to try the idea in the test bed though and see what happens.
USING THE IDD FOR TRACTION - The rover cannot drive while the IDD is in motion at the same time. Consider this also, if the IDD was lodged against the ground, driving over it, the wheels could get a good grip - BUT, then the IDD (the main science instrument) would be useless.
USING IT TO MOVE ROCKS UNDER THE WHEELS TO GAIN TRACTION?
Not impossible, but again the IDD isn't that strong. Lots of little rocks maybe, that unfortunately are not readily stacked about anywhere.

yoann a écrit:Je ne saurai dire ou, mais dans toutes le anonces et/ou articles paru sur spirit et son degagement, je l'ai lu, et j'en suis sur, la reponse est NON. Et en plus il y avai plein de chiffres, mais je sait plus ou j'ai lu ca :scratch:

Mustard a écrit:Evidement, vu que nous n'avons pas de satellite météo sur place il est difficile de prévoir la durée de cette tempête