Author Topic: Chandrayaan-2 GSLV MkIII NET January 30 2019  (Read 165499 times)

Offline chota

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #340 on: 09/03/2018 06:01 PM »
As per redesign a new 800 n motor will be mounted centrally and a new leg will be added. Interesting to see how and where these things will be added. Currently the protruding propulsion tank on the orbitor takes up the central spot of the lander before separation.

Will the entire base become a pentagon to accommodate 5 engines and 5 legs? Seems unstable!
« Last Edit: 09/03/2018 06:18 PM by chota »

Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #341 on: 09/25/2018 10:38 PM »
Chandrayaan-2 Mission doesn't seem to be on schedule, because of several challenges.

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The Indian Space Research Organisation (Isro), which has set itself a January 3, 2019 deadline for the launch of India's second mission to Moon (Chandrayaan-2) has several technological challenges brought about by the new configuration that it must address. In fact, Isro Chairman Sivan K, after whose taking charge the Chandrayaan-2 project has undergone several changes, says that the Lander designed for the programme was ill-configured and would have led to the failure of the programme.

"You can say that this is Chandrayaan-3 as the project has been reconfigured completely. If we went with the previous configuration it would have been a disaster. They had not thought of so many issues, that are being corrected now," Sivan told TOI. "As things stand, January deadline looks difficult to meet, but as the chairman has said there's a window up to March," one person working on Chandrayaan-2 told said.

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Among major challenges are the integration of the fifth liquid engine to manage the additional load of the lander which now has to orbit the Moon, lander legs, rover integration, modified harness and so on. Earlier this year, after the changes were made to the configuration, the fifth liquid engine failed a crucial qualification heat test. The Chandrayaan-2 mission will not be possible without this engine.

While confirming this, Sivan had told TOI in August: "The engine is fine, there was a problem with the way the test was conducted. Out of enthusiasm, people did the test wrong. The space system is such that real space environment must be created. But the way this is simulated must be correct, otherwise, there will be a problem. In this case, instead of creating external heat, the engine itself was heated." On Monday, he reiterated that the engine was alright and that it would be ready for the mission soon.

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Also, in a recent development, the Rover team has written to the project management team that the new configuration has created a problem for the Rover unloading manoeuvre. According to the feedback given by the Rover team, the new extended solar panels - necessitated by the new configuration - now extends well beyond the body of the lander casting a shadow on the rover when it has to come out of the lander.

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One scientist explains: "Although we have a battery, we won't know if that is in charged condition as it would have remained off, so we wanted sunlight. Now, the extension of the solar panel (an additional 350 meters) is casting a shadow, depriving the rover of sunlight during this manoeuvre." Sivan, however, said: "These are design challenges which will be overcome without much problem. It will all be corrected." Sivan has been insistent that the testing of Chandrayaan-2 happen only after the entire configuration is ready. The complete integration is expected to be ready by November 30.

Source : Chandrayaan-2: Several challenges to meet Jan 2019 deadline

Offline Phil Stooke

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #342 on: 09/25/2018 10:40 PM »
I was just about to post on that same article!  It looks troubling.  I hope they don't feel rushed into a premature launch to meet expectations. 

Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #343 on: 09/26/2018 11:23 PM »
Potential Landing Sites for Chandrayaan-2 Lander in Southern Hemisphere of Moon
https://www.hou.usra.edu/meetings/lpsc2018/pdf/1975.pdf

Offline K210

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #344 on: 09/27/2018 07:03 AM »
I hope they take their time and get it right. This has been a mission in the making for 11 years now it would be a major setback if it ends up a failure.

Personally i do not mind if they push the launch back to mid to late 2019 so they can resolve all these outstanding issues.

Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #345 on: 09/30/2018 12:44 AM »
Code made in Bengaluru to aid moon mission

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India's second moon mission Chandrayaan-2 being launched by the Indian Space Research Organisation (Isro) will have a key software developed by a startup at its Bengaluru development centre. Omnipresent Robot Tech, a Delhi-based software and hardware development company, has developed the software for Chandrayaan's rover imaging and navigational manoeuvre at its development centre in Bengaluru. The software will take charge of the rover once it lands on the moon, a top company official said.

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"We have developed 'Omny3D' which will help the rover to navigate on the moon's surface. It will help to identify rocks and obstacles and track the path from one point to another," Akash Sinha, founder and CEO of Omnipresent, told DH. On the moon, the rover will find it difficult to move as the surface is rough and dark. The software will help to overcome those hurdles.

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The Isro didn't respond to a query sent by DH seeking details of the project. Omnipresent, a seven-year-old startup with more than 50 members, received the project order after winning a tender from Isro. The software also helps in the motion planning of the rover. "We will help in its navigation as per the commands from the ground station," he said.

The company is working closely with the Laboratory for Electro-Optics Systems (Leos), a research lab belonging to the Isro. It involves in the design and development of optics and sensor modules that can be deployed either aboard the satellite or with the launch vehicle.


Offline worldtimedate

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Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #349 on: 10/08/2018 08:16 PM »
Key payload for Chandrayaan-2 leaves for Bengaluru

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The Indian Space Research Organisation (Isro), said that a key payload for India's second moon mission - Chandrayaan-2 -has left the Satellite Application Centre (SAC) in Ahmedabad, where it was developed, for UR Rao Satellite Centre in Bengaluru, which will be responsible for the testing and integration. "The Lander Ka Band Radar Altimeter and HDA Processor was flagged off from SAC to UR Rao Satellite Centre. Ka Band Radar Altimeter and HDA Processor is one of the key payloads of Chandryaan-2," Isro said.

Isro is presently finalising some changes in the configuration, which was revised only this year after a committee of experts found that the landing profile was not conceived in the most optimal way, among other things. While Isro chairman Sivan K has announced January 3 as the date of launch, the most recent review meeting on Chandrayaan-2, held on September 19, has suggested that January 30 may be more ideal.

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The TOI has been tracking Chandrayaan-2 closely and broken several developments, including the decision that the Lander, which according to the original plan was to land soon after separating from the payload, is to now orbit around the moon before landing. Chandrayaan-2, unlike the first mission, involves a Lander soft-landing on the lunar surface and unloading a Rover to study and take measurements from the Moon, while the orbiter will go around the Earth's satellite.

Offline sanman

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #350 on: 10/12/2018 03:22 PM »
« Last Edit: 10/14/2018 02:53 AM by sanman »

Offline PonRam

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #351 on: 10/12/2018 11:50 PM »
Any idea what changes have been made to the E6 version of this engine?
What is specially needed for the Chandrayaan-2 mission?

Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #352 on: 10/13/2018 05:03 AM »
GSLV MK-III cryo engine to be used to launch Chandrayaan-2 tested

ISRO successfully tests Cryogenic Engine (CE-20) for GSLV Mk-III / Chandrayaan-2 Mission

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The Indian Space Research Organisation (Isro), on Friday said it has successfully tested the Cryogenic Engine (CE-20) for GSLV Mk-III, which is earmarked for the launch of India's second moon mission, Chandrayaan-2. The test was done on October 11. The GSLV MK-III vehicle's upper stage is powered by the CE-20, which operates on a gas generator cycle using a combination of liquid oxygen (LOX) and liquid hydrogen (LH2) propellants.

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The fifth hardware of CE-20 integrated engine designated as E6 is earmarked for GSLV Mk-III M1-Chandrayaan 2 mission. According to Isro, the "flight acceptance hot test" test lasted 25 seconds, and it was conducted at the High Altitude Test facility, Isro Propulsion Complex (IPRC), Mahendragiri. "The test demonstrated steady state operation of engine and the performance of all engine subsystems were observed to be normal during the hot test," Isro said.

"The major subsystems of the engine are thrust chamber, gas generator, LOX and LH2 turbo pumps, igniters, thrust and mixture ratio control systems, Start-up system, control components and pyro valves," Isro said, adding that the CE-20 develops a nominal thrust of 186.36 kN with a specific impulse of 442 seconds in vacuum.


Offline sanman

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #353 on: 10/14/2018 02:55 AM »
Any idea what changes have been made to the E6 version of this engine?
What is specially needed for the Chandrayaan-2 mission?

Doesn't necessarily sound like anything was changed - this was just a validation of the flight hardware. After all, the Chandrayaan-2 mission is quite important.


Offline sanman

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Re: Chandrayaan-2 GSLV MkIII NET January 30 2019
« Reply #355 on: 10/21/2018 03:42 PM »
Chandrayaan II almost ready: PRL ex-director

https://timesofindia.indiatimes.com/city/ahmedabad/chandrayaan-ii-almost-ready-prl-ex-director/articleshow/66298429.cms

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Eminent scientist and former Physical Research Laboratory (PRL) director Prof J N Goswami, speaking on sidelines of his lecture at IIT Gandhinagar, said that the project is ‘almost ready’ and has shaped well. “We are expecting the launch in next few months,” he said.
« Last Edit: 10/21/2018 04:31 PM by sanman »

Offline PonRam

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Re: Chandrayaan-2 GSLV MkIII NET January 30 2019
« Reply #356 on: 10/26/2018 02:24 PM »
Chandrayaan-2 Lander Actuator Performance Test (LAPT) Phase 2 completed successfuly.

https://www.isro.gov.in/update/26-oct-2018/chandrayaan-2-lander-actuator-performance-test-lapt-phase-2

Offline PonRam

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Re: Chandrayaan-2 GSLV MkIII NET January 30 2019
« Reply #357 on: 10/27/2018 12:05 AM »
In the photo on the ISRO link above, there are only 4 800N thrusters instead of 5. Are they still using the old diagram of the lander? Any idea why the 5th thruster is not seen?

Offline srikanthr124

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Re: Chandrayaan-2 GSLV MkIII NET January 30 2019
« Reply #358 on: 10/27/2018 07:26 AM »
In the photo on the ISRO link above, there are only 4 800N thrusters instead of 5. Are they still using the old diagram of the lander? Any idea why the 5th thruster is not seen?
I think in that link they have most probably used an old test image.there should be an 5th engine.And without that engine the test will be incomplete.And why should they omit critical component in testing...
« Last Edit: 10/27/2018 07:35 AM by srikanthr124 »

Offline K210

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Re: Chandrayaan-2 GSLV MkIII NET January 30 2019
« Reply #359 on: 10/27/2018 10:42 AM »
As the Mk-3 D2 mission slips into december it is becoming more and more likely that this launch will only take place in febuary-march next year at earliest.