Author Topic: Indian Reusable Launch Vehicle Program  (Read 37346 times)

Online sanman

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Re: Indian Reusable Launch Vehicle Program
« Reply #40 on: 07/13/2013 03:32 PM »
When is HEX-01 coming up?

Possibly 9 months to a year from now?

Offline AJA

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Re: Indian Reusable Launch Vehicle Program
« Reply #41 on: 07/13/2013 04:54 PM »
SPLASHDOWN? For a winged body with aerodynamic control?

Indian Surprise Research Organisation. :D

Offline hop

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Re: Indian Reusable Launch Vehicle Program
« Reply #42 on: 07/13/2013 07:14 PM »
SPLASHDOWN? For a winged body with aerodynamic control?
Not unheard of for unmanned test articles, see http://www.astronautix.com/craft/bor4.htm for example.

Offline antriksh

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Re: Indian Reusable Launch Vehicle Program
« Reply #43 on: 07/14/2013 03:25 AM »
SPLASHDOWN? For a winged body with aerodynamic control?

Indian Surprise Research Organisation. :D

One step at a time when you are doing it for the first time. first step is learning how the vehicle will behave during hypersonic flight. It will come to landing also in the LEX (drop and land experiment) and REX or return flight experiment (launch and land back).
« Last Edit: 07/14/2013 03:28 AM by antriksh »
Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Offline antriksh

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Re: Indian Reusable Launch Vehicle Program
« Reply #44 on: 09/11/2013 03:21 AM »
FADS for the mission under test

To be used for the flight regime of 2.5 Mach to 0 Mach.

Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Online sanman

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Re: Indian Reusable Launch Vehicle Program
« Reply #45 on: 09/11/2013 09:47 PM »
Google says FADS = Flush Air Data Sensing

So what's that for?

Offline antriksh

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Re: Indian Reusable Launch Vehicle Program
« Reply #46 on: 09/12/2013 02:56 AM »
Google says FADS = Flush Air Data Sensing

So what's that for?

Air data sensing system that uses flush pressure orifices embedded in the body. Pitot tubes are not suitable for hypersonic flight where the heat generated can destroy them.

NEURAL NETWORK BASED FLUSH AIR DATA SYSTEM (FADS) FOR REUSABLE LAUNCH VEHICLES
Abstract
Flush air data systems (FADS) are gaining importance for use in measurement of air data parameters like angle of attack, sideslip angle, Mach number and dynamic pressure for reentry and reusable vehicles, advanced aircrafts, interplanetary space probes etc. These air data parameters are critical for successful mission management of the vehicle during the flight phases dominated by complex aero thermal effects.

Flush Air Data System makes use of a matrix of flush pressure orifices located on the nose region (or stagnation region) of the vehicle to estimate air data parameters. The surface pressures are sensed using highly accurate absolute pressure transducers. The multivariable relationship between the pressure measurement and the output air data parameters is complex and highly nonlinear. Different methods are proposed in literature for the estimation of air data parameters using surface pressure measurements. Some of the earlier semi-empirical model based approaches used to process FADS pressure data have experienced numerical instabilities resulting in momentary degradation in system performance.

In this paper a neural network based FADS algorithm is developed for a reusable launch vehicle technology demonstrator. FADS is proposed to be used for the flight regime from Mach number 2.5 to 0. Neural networks, which require large quantities of training aerodynamic data set offer a simple, flexible and accurate solution for such complex applications. Neural network systems allow for the correlation of complex nonlinear systems without requiring explicit knowledge of the functional relationship that exists between the input and output variables of the system. Further, algorithms with neural network techniques are inherently stable for the calibration of nonlinear data involving more number of independent parameters.

The pressure port configuration used in this paper consists of nine pressure ports located on the nosecone of the vehicle. The pressure ports are arranged in a crucifix fashion with five ports located in the vertical meridian and four in the horizontal meridian. The pressure ports are connected to the pressure transducer using pneumatic tubing designed to satisfy frequency and thermal response requirements. The developed algorithm is validated using calibration data generated from wind tunnel tests. Back propagation technique is used to train the neural network to achieve the desired level of accuracy. The present study shows that with properly trained networks, the neural network can be used effectively for real-time prediction of air data states during the critical flight phases.

Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Offline antriksh

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Re: Indian Reusable Launch Vehicle Program
« Reply #47 on: 12/02/2013 01:59 PM »
Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Offline antriksh

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Re: Indian Reusable Launch Vehicle Program
« Reply #48 on: 12/20/2013 06:30 AM »
TSTO RLV

First stage: vertical launch powered by 3 semi-cryogenic engines (2000 kn each). Unpowered glide back to airstrip after separation around 100-150 km. RLV-TD programme to demonstrate the technologies involved in this stage development.

Second stage: Recoverable stage powered to orbit by cryogenic propulsion involving 2 cryogenic engines. Spacecraft/satellite separation by opening the cargo bay doors. Ballistic re-entry into the earth atmosphere and to be recovered at sea. SRE programme to demonstrate the technologies involved in the development of this stage
« Last Edit: 12/20/2013 06:32 AM by antriksh »
Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Offline vyoma

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Re: Indian Reusable Launch Vehicle Program
« Reply #49 on: 06/11/2017 12:53 AM »
ISRO has research proposal for winged body re-entry as part of their RESPOND program:

Wing body reentry vehicle optimization studies (VSSC):
Wing body reentry vehicle is a reusable launch vehicle concept to reduce the satellite launch vehicle cost drastically by safely returning the launch vehicle back to earth surface after the satellite/payload insertion in required orbit for re-launch. During reentry, the vehicle has to pass through low density atmosphere to high density atmosphere, High hypersonic Mach number to low subsonic mach number during touchdown and it also
encounter viscous flow regime and pass through laminar to turbulent flow regimes. The key aerodynamic and aero-thermodynamic design aspects are optimum heat flux, heat load, load factor, less than 4g deceleration,
sufficient payload bay, down range and cross range capability, good longitudinal and lateral- directional aerodynamic stability, adequate control surface effectiveness, reduced TOPS cost. The optimum external
aerodynamic design must fulfill some of the important objectives given above.

Re-entry module is used for scientific mission, or to bring back astronauts from space back to earth. Re-entry module can be a ballistic/or semi ballistic concept with minimum control. The key aerodynamic and aero thermodynamic parameters are minimizing the maximum heat flux, heat load and g force with optimum stable aerodynamic shape for the purpose.

The module must be free from any dynamic stability issues, must have less dispersion in the down range and cross range, both soft landing on land and sea has to be considered within the design.

Online sanman

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Re: Indian Reusable Launch Vehicle Program
« Reply #50 on: 06/11/2017 06:18 AM »
Latest interview with ISRO chief Dr S Kiran Kumar mentions RLV-TD:

http://www.thehindu.com/todays-paper/tp-national/gslv-mkiii-has-given-us-a-big-push-isro-chairman/article18958357.ece

Quote
You mentioned reusable technology to save costs. Where are we in that?

Last year, we tried out the RLV-TD experiment [Reusable Launch Vehicle Technology Demonstrator]. We got a small, plane-like model to vertically land on water. Next we will look at landing it on the ground with a landing gear system. We are conceiving systems to work on the air breathing propulsion technology that will use atmospheric oxygen. For the present launch vehicles, we will look at recovering [and reusing] some parts.

So it sounds like the next experiment will be LEX - the Landing EXperiment - whereby the remaining twin RLV-TD model will be fitted with landing gear and landed on a runway. I'm assuming it will simply be dropped from an aircraft and not fired from a rocket, before deploying its landing gear to land conventionally. I think it's previously been mentioned that they might even possibly combine LEX with REX (Return flight EXperiment), the latter being where RLV-TD is fitted with a conventional turbojet, to take off from a runway conventionally and then land back on the runway conventionally, without being dropped from any carrier aircraft.

Offline russianhalo117

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Re: Indian Reusable Launch Vehicle Program
« Reply #51 on: 06/11/2017 04:50 PM »
Latest interview with ISRO chief Dr S Kiran Kumar mentions RLV-TD:

http://www.thehindu.com/todays-paper/tp-national/gslv-mkiii-has-given-us-a-big-push-isro-chairman/article18958357.ece

Quote
You mentioned reusable technology to save costs. Where are we in that?

Last year, we tried out the RLV-TD experiment [Reusable Launch Vehicle Technology Demonstrator]. We got a small, plane-like model to vertically land on water. Next we will look at landing it on the ground with a landing gear system. We are conceiving systems to work on the air breathing propulsion technology that will use atmospheric oxygen. For the present launch vehicles, we will look at recovering [and reusing] some parts.

So it sounds like the next experiment will be LEX - the Landing EXperiment - whereby the remaining twin RLV-TD model will be fitted with landing gear and landed on a runway. I'm assuming it will simply be dropped from an aircraft and not fired from a rocket, before deploying its landing gear to land conventionally. I think it's previously been mentioned that they might even possibly combine LEX with REX (Return flight EXperiment), the latter being where RLV-TD is fitted with a conventional turbojet, to take off from a runway conventionally and then land back on the runway conventionally, without being dropped from any carrier aircraft.
LEX will have drop tests first. The spare rocket for RLV-TD was built so not telling if it will be fired with LEX payload or fly with another stage as a sounding rocket.

Offline vineethgk

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Re: Indian Reusable Launch Vehicle Program
« Reply #52 on: 07/17/2017 05:16 AM »
ISRO gearing up for second prototype test of RLV-TD for landing experiment
Quote
Work is progressing at the Vikram Sarabhai Space Centre (VSSC) here on the second RLV-TD. A senior officer associated with the project said the RLV-TD will almost be a ditto version of the first scaled-down RLV-TD with the only exception being it will have landing gear
Quote
ISRO sources said it may take another year for the model to be ready. They said the present plan is to launch the RLV-TD from Sriharikota and land it on an undisclosed Air Force airfield in the eastern sector. This is yet to be finalised though, they said.
Quote
ISRO plans a series of TDs before attempting to build a fully-fledged vehicle that can be reused for launching satellites. A subsequent TD will possibly involve a slightly larger vehicle which will place a nano-satellite in the orbit.
I'm not sure if that last piece of info (if accurate) means they eventually plan to have a slightly scaled-up version of RLV-TD mounted on a larger solid booster and equipped with small liquid engines for orbit insertion, or whether they plan to mount it as a payload on a PSLV to test its re-entry characteristics from orbit.

Offline vineethgk

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Re: Indian Reusable Launch Vehicle Program
« Reply #53 on: 07/17/2017 05:29 AM »
Quote
They said the present plan is to launch the RLV-TD from Sriharikota and land it on an undisclosed Air Force airfield in the eastern sector. This is yet to be finalised though, they said.

IAF has a base in Andaman and Nicobar Islands. That might be a probable option as it pretty much lies in the direction of an eastward flight path from Sriharikota and is located at the right distance as well.

Online sanman

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Re: Indian Reusable Launch Vehicle Program
« Reply #54 on: 07/17/2017 05:39 AM »
Quote
ISRO plans a series of TDs before attempting to build a fully-fledged vehicle that can be reused for launching satellites. A subsequent TD will possibly involve a slightly larger vehicle which will place a nano-satellite in the orbit.
I'm not sure if that last piece of info (if accurate) means they eventually plan to have a slightly scaled-up version of RLV-TD mounted on a larger solid booster and equipped with small liquid engines for orbit insertion, or whether they plan to mount it as a payload on a PSLV to test its re-entry characteristics from orbit.

I thought there were even going to be some kind of tests involving DMRJ (Dual-Mode-RamJet)
I didn't hear about any scaled-up version for testing, though - I thought it was going to be this same vehicle being recovered, modified and re-flown for further tests.


Quote
They said the present plan is to launch the RLV-TD from Sriharikota and land it on an undisclosed Air Force airfield in the eastern sector. This is yet to be finalised though, they said.

IAF has a base in Andaman and Nicobar Islands. That might be a probable option as it pretty much lies in the direction of an eastward flight path from Sriharikota and is located at the right distance as well.

I'm assuming that the future TSTO vehicle which will be developed from RLV-TD technology will itself be landing in the Andaman & Nicobar Islands, so it makes sense to have RLV-TD land there as well during testing.


Offline sanjaykumar

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Online sanman

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Re: Indian Reusable Launch Vehicle Program
« Reply #56 on: 07/17/2017 06:43 AM »

https://www.youtube.com/watch?v=Ya1FUEBY0N4


I think it's easier to read the above article which this video is reading aloud from  ;)

Offline sanjaykumar

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Re: Indian Reusable Launch Vehicle Program
« Reply #57 on: 07/17/2017 06:47 AM »
Amen!

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