China's Space Program News Thread

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Quickie said:
The testing conditions on earth are actually very different from the conditions during the actual landing of the probe on the moon. First of all you have a much less gravity force, 1/6 of earth's, acting on the lander/rover on the moon. This is a big difference, about 6 times less, from that of the earth's during the earth base testing of the vehicle. Reducing the mass of the vehicle won't do, because this wouldn't be actually simulating the actual mass of the vehicle on the moon, which is very important since the complex interaction of forces, including those inertia forces due to the mass of the vehicle, have to be taken into account during the landing.
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how about using baloon to reduce weight ?
 
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chuck731

Banned Idiot
If you really want to, you can easily and accurately reduce the weight of the rover/probe on its wheels by putting a lighter load on the chassis of the probe, if you are interested in testing its suspension and drive mechanism. But you can't reduce the weight of every single individual component in a complete problem rover/probe to do a true site gravity simulation.
 
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Lieutenant General
chuck731 said:
If you really want to, you can easily and accurately reduce the weight of the rover/probe on its wheels by putting a lighter load on the chassis of the probe, if you are interested in testing its suspension and drive mechanism. But you can't reduce the weight of every single individual component in a complete problem rover/probe to do a true site gravity simulation.
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What about under water testing? And use that data to simulate the conditions on the moon on the computer?
 
escobar

escobar

Brigadier
CAS institutes involved in the development of CE-3 science instruments:

Lander

* MastCam: Institute of Optics and Electronics (IOE), Chinese Academy of Sciences (CAS)
* Descent Camera: Beijing Institute of Space Machinery and Electricity (BISME), China Academy of Space Technology (CAST)
* Lunar-based Ultraviolet Telescope (LUT): National Astronomy Observatory of China (NAOC), CAS
* Extreme Ultraviolet Imager (EUV): Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), CAS

Rover

* PanCam: Xian Institute of Optics and Precision Mechanics (OPT), CAS
* Ground Penetration Radar (GPM): Institute of Electronics, CAS
* VIS/NIR Imaging Spectrometer (VNIS): Shanghai Institute of Technical Physics (SITP), CAS
* Alpha Particle X-Ray Spectrometer (APXS): Institute of High Energy Physics (IHEP), CAS
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Lieutenant General
chuck731 said:
Drag of water and potential infiltration of fluids makes it quite unrealistic.
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One can test it in a large deep pool that can control the water currents like NASA has done for many of it's space projects. A model of the rover and landing can be made water proof for certain testings and control measurements.
 
TerraN_EmpirE

TerraN_EmpirE

Tyrant King
its possible if you can calculate the level of buoyancy needed to match the lower gravity environment but... there is still a lot lost in the translation. I think for testing a Rover one should run it thought autonomous operations in the desert, to allow testing of geological tools and trouble shooting as you want to just leave it alone, underwater, vacuum and sand blasting it.
 
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