IPB

Welcome Guest ( Log In | Register )

23 Pages V  « < 21 22 23  
Reply to this topicStart new topic
Nasa announces new rover mission to Mars in 2020
7B8
post Jun 23 2020, 10:00 AM
Post #331


Newbie
*

Group: Members
Posts: 9
Joined: 27-February 12
Member No.: 6346



QUOTE (mcaplinger @ Jun 22 2020, 10:32 PM) *
More information about the helicopter here: https://trs.jpl.nasa.gov/bitstream/handle/2...L%2317-6243.pdf


Brilliant. Thanks. That answers my question. I'll take away that the landing system is fairly robust in terms of surface properties (soft/hard) but that the area for a test flight should only contain a few rocks higher than 5 cm and a general slope of up to 10 degrees.
Go to the top of the page
 
+Quote Post
MichaelJWP
post Jun 23 2020, 03:15 PM
Post #332


Junior Member
**

Group: Members
Posts: 39
Joined: 9-August 12
From: London, UK
Member No.: 6521



Getting exciting as we approach the launch date.

Just watching the final assembly of the rover and packing for the transit to Mars, along with some great detail pictures of the 'skycrane'.

Was wondering if anyone had any reference to PDFs etc. on the development of this part of the EDL? And the control software?
For example, was this one (or Curiosity's) system tested in any way, as per the helicopter? Or was that impractical and it was all done with simulations and component testing?

Thanks for any detail:)
Go to the top of the page
 
+Quote Post
MichaelJWP
post Jun 25 2020, 09:26 AM
Post #333


Junior Member
**

Group: Members
Posts: 39
Joined: 9-August 12
From: London, UK
Member No.: 6521



QUOTE (MichaelJWP @ Jun 23 2020, 03:15 PM) *
Getting exciting as we approach the launch date.

Just watching the final assembly of the rover and packing for the transit to Mars, along with some great detail pictures of the 'skycrane'.

Was wondering if anyone had any reference to PDFs etc. on the development of this part of the EDL? And the control software?
For example, was this one (or Curiosity's) system tested in any way, as per the helicopter? Or was that impractical and it was all done with simulations and component testing?

Thanks for any detail:)

Answering my own post here but managed to locate a few interesting PDFs about the Descent Stage for MSL/Curiosity. Not sure how much of the system has been upgraded for this mission though.
Go to the top of the page
 
+Quote Post
Jim In ILLINOIS
post Jun 25 2020, 10:06 PM
Post #334


Newbie
*

Group: Members
Posts: 2
Joined: 26-May 16
Member No.: 7962



Launch Window: July 22 - Aug. 11, 2020

https://mars.nasa.gov/mars2020/

Go to the top of the page
 
+Quote Post
mcaplinger
post Jun 26 2020, 12:02 AM
Post #335


Senior Member
****

Group: Members
Posts: 2502
Joined: 13-September 05
Member No.: 497



QUOTE (MichaelJWP @ Jun 25 2020, 01:26 AM) *
Not sure how much of the system has been upgraded for this mission though.

A good source of information is the JPL Tech Report Server at https://trs.jpl.nasa.gov . Go there and search for "skycrane". See, for example, https://trs.jpl.nasa.gov/bitstream/handle/2...L%2316-2401.pdf


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
Go to the top of the page
 
+Quote Post
rlorenz
post Jun 27 2020, 02:05 AM
Post #336


Member
***

Group: Members
Posts: 609
Joined: 23-February 07
From: Occasionally in Columbia, MD
Member No.: 1764



QUOTE (mcaplinger @ Jun 16 2020, 12:44 PM) *
When I said "fluid loop" I meant "fluid loop heated by the RTG". Look at the Cassini and Galileo examples, that had big RTGs and a whole bunch of little RHUs, leaving all the RTG heat just being wasted into space. Of course fluid loops have their own problems.


Technically there were fluid loops in the Cassini RTGs, but they were for cooling during ground handling - they didnt take the heat to the spacecraft. There was some exploitation of conducted/radiated heat in keeping the propulsion system a bit warm, but in fact there were shields to keep the RTGs from radiating too much heat onto the instruments.

A recent example of a non-RTG non-rover pumped fluid loop is Parker Solar Probe.

Dragonfly (which you could not unreasonably describe as a rover) will use a fluid loop, in the same way as Curiosity.
Go to the top of the page
 
+Quote Post
Tom Dahl
post Jun 28 2020, 11:49 PM
Post #337


Member
***

Group: Members
Posts: 101
Joined: 3-May 12
From: Massachusetts, USA
Member No.: 6392



QUOTE (rlorenz @ Jun 26 2020, 09:05 PM) *
Technically there were fluid loops in the Cassini RTGs, but they were for cooling during ground handling - they didnt take the heat to the spacecraft. There was some exploitation of conducted/radiated heat in keeping the propulsion system a bit warm, but in fact there were shields to keep the RTGs from radiating too much heat onto the instruments.

For that matter, the Viking landers had a fluid loop, also primarily used during ground handling to keep the lander interior cool (each of the landers' two RTGs produced more heat in Earth's sea-level-pressure and warmish atmosphere environment than in vacuum or on the surface of Mars). The coolant loop was also used during the two-day terminal sterilization cycle when the lander was baked in a giant oven, to pump sterile hot water through the loop to heat the lander interior more quickly than would otherwise occur due to the very effective body insulation.

During portions of the on-surface mission corresponding to Mars local winter, heat from the RTGs was conducted into the lander via automatic Thermal Switches.
Go to the top of the page
 
+Quote Post
Antdoghalo
post Jul 2 2020, 11:20 AM
Post #338


Member
***

Group: Members
Posts: 223
Joined: 13-October 09
From: Olympus Mons
Member No.: 4972



Launch delayed to the 30th due to rocket sensor issue. They are extending the optimistic launch window to the 15th of August.
https://www.mynews13.com/fl/orlando/ap-onli...eks-left-to-fly


--------------------
"Thats no moon... IT'S A TRAP!"
Go to the top of the page
 
+Quote Post
Antdoghalo
post Jul 22 2020, 12:53 AM
Post #339


Member
***

Group: Members
Posts: 223
Joined: 13-October 09
From: Olympus Mons
Member No.: 4972



Here is a Google Earth overlay showing the rover/drone landing site. It has a geologic overlay map and a HiRISE image covering most of the ellipse. Would do the same for Tianwen but... it's just a giant polygon over Utopia.
Attached File(s)
Attached File  Mars_2020_Rover__Perserverance_.kmz ( 2.99K ) Number of downloads: 622
 


--------------------
"Thats no moon... IT'S A TRAP!"
Go to the top of the page
 
+Quote Post
Steve G
post Jul 31 2020, 10:05 PM
Post #340


Member
***

Group: Members
Posts: 289
Joined: 29-December 05
From: Ottawa, ON
Member No.: 624



I'm curious about MOXIE. It separates oxygen from the carbon in CO2. The Oxygen is released as a gas, but what form will the carbon be?
Go to the top of the page
 
+Quote Post
mcaplinger
post Jul 31 2020, 10:34 PM
Post #341


Senior Member
****

Group: Members
Posts: 2502
Joined: 13-September 05
Member No.: 497



QUOTE (Steve G @ Jul 31 2020, 02:05 PM) *
I'm curious about MOXIE. It separates oxygen from the carbon in CO2. The Oxygen is released as a gas, but what form will the carbon be?

Dumped as gaseous carbon monoxide and unseparated CO2. It's worth noting that AFAIK the O2 is not actually collected, just measured to see that it existed. You could ask how useful this really is, but I'm not a chemist so my opinion doesn't count.

https://www.hou.usra.edu/meetings/marsdust2017/pdf/6036.pdf


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
Go to the top of the page
 
+Quote Post
Marvin
post Aug 3 2020, 05:55 PM
Post #342


Member
***

Group: Members
Posts: 102
Joined: 12-August 12
Member No.: 6540



QUOTE (Antdoghalo @ Jul 21 2020, 07:53 PM) *
Here is a Google Earth overlay showing the rover/drone landing site. It has a geologic overlay map and a HiRISE image covering most of the ellipse. Would do the same for Tianwen but... it's just a giant polygon over Utopia.


Thanks for that.

I wonder what route the rover will take? Here is a wild guess: W then SW until it finds a way up the escarpment:

Attached Image
Go to the top of the page
 
+Quote Post
JRehling
post Feb 20 2021, 08:46 PM
Post #343


Senior Member
****

Group: Members
Posts: 2530
Joined: 20-April 05
Member No.: 321



I found this resource on NASA's own site to be misleading:

An animation at
https://mars.nasa.gov/mars2020/timeline/surface-operations/

Shows a mission traversal in which the rover climbs the fan deposit once and returns to the bottom, leaving a cache. Then it climbs on a second, similar but different route, and returns to the bottom, leaving the other cache.

Other discussion here indicates that the plan is to ascend the south (from Perseverance's POV, left) side of the fan deposit, and keep going west, leaving two caches atop the plain outside the crater.

If the second is correct, it's unfortunate that NASA has an animation with incorrect information featured so prominently.

Attached thumbnail(s)
Attached Image
 
Go to the top of the page
 
+Quote Post
nprev
post Feb 20 2021, 10:18 PM
Post #344


Merciless Robot
****

Group: Admin
Posts: 8783
Joined: 8-December 05
From: Los Angeles
Member No.: 602



To be fair, considering that MSR mission design is still evolving it may be asking a lot to hold them to a high standard of accuracy here. Investing the time and money to update this & other EPO/PR tool every time things change before CDR (which is undoubtedly still years away) doesn't seem like a wise use of resources.


--------------------
A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
Go to the top of the page
 
+Quote Post

23 Pages V  « < 21 22 23
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 19th March 2024 - 09:47 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.