China's Space Program Thread II

[tphuang]

This is a thread on China's space program, not SpaceX. Let's get back on topic. Comparing China to SpaceX constantly is really not all that helpful. The question should be whether or not China's space program can support its own industries.

Anything more on SpaceX will be deleted

 

[gelgoog]

The reason for using stainless steel was because of the second stage. Aluminium does not withstand heat soaking properly. It would require the use of much heavier and/or brittle TPS.

 

[2=GT]

Pakistani ICUBE-Q, jointly developed with Shanghai Jiaotong University was deployed from Chang'e-6 at ~08:14:36 UTC on May 08

https://twitter.com/i/web/status/1788222332106092618

 

[anzha]

News of Chang'e 6 first:

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Papers!

Moon first:

Lunar regolith water ice simulation method and characterization

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Quantitative sampling and thermal extraction of the lunar regolith for lunar volatile exploration: Method and validation

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Modeling and analysis for volatile characteristics of lunar water ice

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And the rest is mostly just tech stuff:

Study on a hybrid-produced magnetic-field Hall thruster

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Experimental investigation on detonation characteristics of boron-rich gelled propellant in static premixed combustible gases

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Sequence planning for on-orbit robotic assembly based on symbiotic organisms search with diversification strategy

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Response characteristics and impact resistance of composite laminates with shear stiffening gel under hypervelocity impact

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A powered descent trajectory planning method with quantitative consideration of safe distance to obstacle

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Time-optimal coordinated detumbling and pose adjusting control of a non-cooperative target with model uncertainties

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The pointing uncertainty Region's analysis of inter-satellite laser alignment systems under multiple uncertainties

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Reinforcement learning-based finite time control for the asymmetric underactuated tethered spacecraft with disturbances

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Review of machine learning in robotic grasping control in space application

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[Maddy7881]

The reason for using stainless steel was because of the second stage. Aluminium does not withstand heat soaking properly. It would require the use of much heavier and/or brittle TPS.

That is perfect. That makes the expendable second stage even more cheaper. Methalox, common bulkhead, auto-pressurization of the tanks using the propellants themselves, and use of pressurized propellant for precise orbital insertion. If you could land the first stage with payload fairing attached to it, all you need for another flight is second-stage. There is a little bit of mass penalty for the first stage as it has an elongated fairing attached but, it can be constructed with light carbon composites as it does not have to withstand cryogenic temperatures and should be below 5-6 tonnes. The second stage can have even higher propellant/mass fraction as it avoids fairings and increased structural mass of the tanks as it does not have to withstand dynamic pressure while going through atmosphere. The great performance of falcon-9 is due to the highest propellant/mass fraction.

 

[iantsai]

北京时间2024年5月9日09时43分，我国在西昌卫星发射中心使用长征三号乙运载火箭，成功将智慧天网一号01星发射升空，卫星顺利进入预定轨道，发射任务获得圆满成功。
此次任务是长征系列运载火箭的第521次飞行。

China launched Zhihui Tianwang Yihao-01 (Intelligent Skynet One-01 ) satellite by CZ-3B rocket from Xichang Satellite Launch Center on 09:43 UTC+8, May 9, 2024.

It's the 521st CZ series rocket launch.

 

[escobar]

A constallation for global communication with the priority to provide communication service to China's Antactic station and other polar region operations, such as ships travelling the arctic ocean.

1. Developed by Qinghua University, operated by its outfit company in Shanghai in collabration with SAST.
2. Three groups. Each group has 8 stats. Totally 24 sats. Orbit 20,000km
3. First group to be launched before 2025. Total bandwidth 200Gbps.
4. Total bandewidth to reach Tbps after group 2 and 3 in place.

Details in Chinese.

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Two SAST tests sats of Smart Skynet MEO wideband comsats launched. After the satellites are put into orbit, technology tests such as space-based network routing and switching, flexible capacity on-demand coverage, and space-based laser communications will be carried out.

 

[eprash]

Heard a rumour from colleague about a new docking system developed by China that have inflatable/removable hatch doors, Couldn't find any more info, Any member here got anything?

 

[by78]

High-resolution images from the latest Long March 3B launch, which successfully inserted Zhihuitianwang-1 01 into orbit.

 

[by78]

(Continued from above...)

Zhihuitianwang-1 01 is the first satellite of the Zhihuitianwang (Skynet-1) constellation, which is a broadband communications constellation first proposed by the Tsinghua University. The constellation will eventually be expanded to 32 satellites covering the entire globe. It will also provide space-based backhaul service for future 6G networks.